JP2020117378A - Tank oil drainage device for hydraulic elevator - Google Patents

Abstract

To provide a tank oil drainage device for a hydraulic elevator that makes it easy and fast to check and replace a packing material installed at the bottom of the tank.SOLUTION: A tank oil drainage device 70 for checking and replacing a packing material disposed around an oil supply pipe connected to the bottom of the tank that stores hydraulic oil used to operate a hydraulic elevator includes a cylindrical partition member 72 that is pressed against the bottom around the perimeter of the oil supply pipe, and a pressing mechanism 74 that presses the partition member 72 against the bottom so that the hydraulic oil in the area above the oil supply pipe connected to the bottom is partitioned from the hydraulic oil in other areas of the tank.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for draining tank oil of a hydraulic elevator, and more particularly to a device for draining hydraulic oil in an upper region of an oil supply pipe connected to the bottom of a tank.

Conventionally, a hydraulic elevator is known. In a hydraulic elevator, when hydraulic oil contained in a tank is sent into the cylinder of a hydraulic actuator by a pump to raise the plunger, the rope wound around the pulley located at the upper end of the plunger is connected to the cage. Moves up in the hoistway. On the other hand, when the hydraulic oil is returned from the cylinder to the tank via the return pipe connected to the cylinder of the hydraulic actuator, the plunger descends and the car descends in the hoistway.

In such a hydraulic elevator, a plurality of packing members are used for a tank, a hydraulic actuator, etc. in order to prevent leakage of hydraulic oil. Since these packing members are made of an elastic material such as rubber, and deterioration over time cannot be avoided, it is necessary to appropriately confirm or replace them.

For example, Patent Document 1 describes a method for replacing a packing or the like that seals between a cylinder of a hydraulic actuator and a plunger in maintenance of a hydraulic elevator.

JP, 2017-52610, A

In the hydraulic elevator, for example, a rubber packing member may be arranged around the opening of the oil supply pipe connected to the bottom of the tank that stores the hydraulic oil. In this case, when the packing member in the tank deteriorates over time due to long-term use and becomes brittle, the waste separated from the packing member may be sucked into the oil supply pipe. Then, the solenoid valve for oil supply provided in the oil supply pipe between the tank and the hydraulic actuator may be clogged, resulting in malfunction of the hydraulic actuator.

Therefore, it is also necessary to appropriately check and replace the packing member in the tank. However, since the packing member is located at the bottom of the tank, it cannot be visually confirmed from above the tank due to the presence of opaque hydraulic oil. Therefore, if a maintenance worker tries to check the state of the packing member by touching the packing member with his or her hand, the foreign matter that has settled at the bottom of the tank floats in the working oil and is not allowed to enter the oil supply pipe. It may get inside, and in this case as well, it may cause malfunction of the refueling solenoid valve.

Therefore, it may be possible to check and replace the packing member at the bottom of the tank once the hydraulic oil in the tank has been drained, but in this case, an electric pump, extension cord reel, many containers, etc. must be prepared. In addition, it takes a long time to remove all the hydraulic oil from the tank.

An object of the present invention is to provide a device for removing oil from a tank of a hydraulic elevator, which enables easy and short-time work of checking and replacing a packing member installed at the bottom of a tank.

A device for removing oil from a tank of a hydraulic elevator according to the present invention is for confirming or replacing a packing member arranged around an oil supply pipe connected to a bottom portion of a tank that stores hydraulic oil for operating a hydraulic elevator. A device for removing tank oil, wherein the operating oil in the upper region of the oil supply pipe connected to the bottom is partitioned from the operating oil in the other region in the tank, and the operating oil is provided around the oil supply pipe. It is characterized by comprising a tubular partition member that is pressed against the bottom portion, and a pressing mechanism that presses the partition member against the bottom portion.

With this configuration, the packing installed at the bottom of the tank can be confirmed and replaced by extracting only the hydraulic oil inside the partition member. Therefore, as compared with the case where all the hydraulic oil in the tank is once drained, the work can be performed easily and in a short time, and the work efficiency is significantly improved.

In the device for removing oil from the tank of the hydraulic elevator according to the present invention, it is preferable that an elastic seal member is attached to a lower end portion of the partition member that is pressed against the bottom portion. As a result, it is possible to reliably prevent the hydraulic oil from entering the inside of the partition member from between the partition member and the tank bottom.

Further, in the tank oil removing device of the hydraulic elevator according to the present invention, a fixed beam is provided on the upper portion of the tank, and the pressing mechanism presses against the partition member by being engaged with the fixed beam. You may generate force. According to this configuration, by using the fixed beam provided on the tank upper portion, the partition member can be firmly pressed against the tank bottom portion, and it is possible to reliably prevent the hydraulic oil from entering the partition member inside.

In this case, the pressing mechanism includes a rod-shaped member having one end connected to the partition member and a male threaded portion at the other end, and a nut screwed to the male threaded portion. The nut may be tightened on the male screw portion so that the nut is pressed against the rod-shaped member to generate a pressing force. According to this configuration, the partition member can be firmly pressed by the pressing mechanism having a simple structure including the rod-shaped member provided with the male screw portion and the nut screwed with the male screw portion, and the operation of the partition member to the inner side can be performed. It is possible to reliably prevent oil from entering.

Further, in this case, the fixed beam may be formed with a notch into which the rod-shaped member is fitted. According to this configuration, the rod-shaped member of the pressing mechanism is fitted into the cutout portion of the fixed beam, so that a pressing force is generated on the partition member while the rod-shaped member is stably supported by the fixed beam. You can

Further, in the tank oil draining device of the hydraulic elevator according to the present invention, the partition member may be installed in a state in which the opening of the oil supply pipe connected to the bottom is closed by a plug member. With this configuration, it is possible to prevent screws, nuts, and the like from entering the oil supply pipe during the work.

Further, in the tank oil draining device of the hydraulic elevator according to the present invention, the hydraulic oil inside the partition member partitioned from the other region in the tank may be drainable by a manual pump. According to this configuration, an electric pump, an extension cord reel for supplying electric power to the electric pump, and the like are unnecessary, and preparation and work can be facilitated.

Further, in the device for removing oil from the tank of the hydraulic elevator according to the present invention, the packing member is removed from the periphery of the oil supply pipe in a state where the plug member is removed after removing the hydraulic oil inside the partition member. May be done. According to this structure, the packing member can be checked and replaced by removing the plug member and exposing the packing member.

According to the tank oil removing device of the hydraulic elevator according to the present invention, the work of checking and replacing the packing member installed at the bottom of the tank can be performed easily and in a short time.

It is a figure showing the whole hydraulic elevator composition. It is a figure which shows the tank which accommodated the hydraulic fluid. It is a perspective view showing a plug member which closes an opening of the 1st oil supply piping. It is a perspective view which shows the tank oil removal implement of this embodiment. It is a figure which shows the state which closed the opening part of the oil supply piping with the plug member. It is a figure which shows the state which has arrange|positioned the device for tank oil removal. It is a figure which shows a mode that the working oil inside the partition member of the tank oil draining tool is drained. It is a figure which shows the state which removed the plug member, after draining the hydraulic oil inside the partition member of the tank oil drain tool. It is a figure which shows the state which removed the packing from the circumference|surroundings of the opening part of an oil supply piping.

Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, etc. are examples for facilitating the understanding of the present invention, and can be appropriately changed according to applications, purposes, specifications and the like. Further, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that the characteristic portions are appropriately combined and used.

FIG. 1 is a diagram showing a schematic configuration of a hydraulic elevator 10 to which a tank oil removing device according to an embodiment of the present invention is applied. The hydraulic elevator 10 includes a car 14 that moves up and down in a hoistway 12 that is a space that extends vertically in a building. A car door 20 is provided on the side wall of the car 14 that faces a landing door 18 installed in an elevator hall 16 of the building.

A plate-shaped or frame-shaped support member 22 is fixed to the lower portion of the car 14. One end of each of a plurality of ropes 24 made of wire, for example, is connected and fixed to the support member 22. Although the rope 24 is shown by one solid line in FIG. 1, the plurality of ropes 24 are arranged side by side in the depth direction of FIG.

A hydraulic actuator 28 is provided upright on the bottom 26 of the hoistway 12. The hydraulic actuator 28 includes a cylinder 30 having a cylindrical shape, and a plunger 32 having a lower end inserted into the cylinder 30 and protruding upward from an upper end of the cylinder 30.

In a machine room 34 provided adjacent to the bottom 26 of the hoistway 12 or the hoistway 12, a tank 36 for storing hydraulic oil and a pump 38 for supplying high-pressure hydraulic oil from the tank 36 into the cylinder 30 are installed. Has been done. The bottom of the tank 36 and the pump 38 are connected by a first oil supply pipe 37. A solenoid valve 40 for refueling is arranged in the second refueling pipe 39 that connects the pump 38 and the lower portion of the cylinder 30. Further, a return oil pipe 41 connected to the lower portion of the cylinder 30 for returning the working oil discharged from the cylinder 30 to the tank 36 is provided with an oil discharge solenoid valve 42. The first oil supply pipe 37 corresponds to the oil supply pipe of the present invention.

A pulley 44 is rotatably attached to the upper end of the plunger 32 of the hydraulic actuator 28. A warp wheel 46 is rotatably supported near the upper end of the plunger 32 at a position diagonally below the pulley 44.

One end of the rope 24 is connected to the support member 22 of the car 14. The rope 24 is wound around the upper side of the pulley 44, is guided by the warp wheel 46, and extends vertically downward. The other end of the rope 24 is connected and fixed to the bottom 26 of the hoistway 12.

A control panel 50 is installed in the machine room 34 (or the bottom 26 of the hoistway 12). The control panel 50 has a function of executing overall control of the entire elevator 10. Specifically, the control panel 50 controls the operation of the pump 38 and controls the opening/closing of the refueling solenoid valve 40 and the oil drainage solenoid valve 42. The control panel 50 is configured to include a processing unit such as a CPU that executes the control program, and a storage unit such as a ROM or RAM that stores the control program, the control parameter threshold value, the measurement data, and the like.

In the hydraulic elevator 10 configured as described above, when the pump 38 is driven and the refueling solenoid valve 40 is opened by the control of the control panel 50, the working oil in the tank 36 is passed through the first refueling pipe 37. It is sucked into the pump 38 and is pumped from the pump 38 into the cylinder 30 of the hydraulic actuator 28 via the second oil supply pipe 39. As a result, the plunger 32 of the hydraulic actuator 28 is pushed up and the pulley 44 is moved upward, and as a result, the car 24 is pulled up by the rope 24 wound around the pulley 44 and moved upward. When the car 14 arrives at the designated landing 16 on the upper floor, the control panel 50 stops the pump 38 and closes the refueling solenoid valve 40.

On the other hand, when the car 14 moves down to the designated lower floor (not shown), the control panel 50 opens the oil discharge solenoid valve 42. As a result, the hydraulic oil in the cylinder 30 returns to the tank 36 via the return pipe 41, and as a result, the plunger 32 descends and the car 14 descends. When the car 14 arrives at the designated lower floor hall, the control panel 50 closes the oil drain solenoid valve 42.

FIG. 2 is a diagram showing a tank 36 that contains hydraulic oil. FIG. 3 is a perspective view showing the plug member 60 that closes the opening of the first oil supply pipe 37. As shown in FIG. 2, the tank 36 contains hydraulic oil that operates the hydraulic actuator 28. An upper end portion of the first oil supply pipe 37 and an upper end portion of the return pipe 41 are connected to the bottom portion 36 a of the tank 36 in a state of protruding into the tank 36.

A fixed beam 52 is provided above the tank 36. The fixed beam 52 is preferably configured by, for example, a long member made of metal. FIG. 2 shows an example in which both ends of the fixed beam 52 are fixed to the side walls on both sides of the tank 36. However, the present invention is not limited to this, and the fixed beam 52 may be fixed to a support member (not shown) that supports the tank 36.

The fixed beam 52 is formed with a plurality of notches 53a and 53b. Each notch 53a, 53b is formed by cutting from the edge of the fixed beam 52 in a U shape in a plan view. A rod-shaped portion 55 forming a part of the filter member 54 is fitted into the cutout portion 53a. The rod-shaped portion 55 is provided with protrusions 56 on both sides, and the protrusions 56 are engaged with the lower surface of the fixed beam 52, whereby the filter member 54 is installed in a state of being pressed downward.

The filter member 54 includes a disc-shaped filter portion 57 provided to cover an opening at an upper end of the first oil supply pipe 37, a rod-shaped portion 55 having a lower end portion connected to a central portion of the filter portion 57, and a filter portion 57. The outer peripheral edge of the lower surface has a ring-shaped packing portion 58 made of, for example, rubber.

A ring-shaped packing member 59 made of, for example, rubber is arranged around the upper end of the first oil supply pipe 37 connected to the bottom 36a of the tank 36. The packing portion 58 is pressed. With this configuration, the hydraulic oil in the tank 36 is sucked into the first oil supply pipe 37 via the filter portion 57 of the filter member 54 when the pump 38 is operated, so that the foreign matters contained in the hydraulic oil by the filter portion 57. It is possible to prevent the above from entering the pump 38 and the refueling solenoid valve 40 from the first refueling pipe 37.

The plug member 60 is suspended and supported by the other notch 53b of the fixed beam 52. The plug member 60 is used, for example, to close the opening of the first refueling pipe 37 during maintenance of the pump 38, the refueling solenoid valve 40, and the like, and is always provided at the installation site of the hydraulic elevator 10. FIG. 3 is a perspective view showing the plug member 60 that closes the opening of the first oil supply pipe 37. As shown in FIGS. 2 and 3, the plug member 60 includes a disk-shaped flat plate 66 for closing the opening at the upper end of the first oil supply pipe 37, and a rod-shaped part in which the lower end is connected to the center of the flat plate 66. 62, and a packing portion 68 made of, for example, rubber, which is annularly provided on the outer peripheral edge of the lower surface of the flat plate 66. Protrusions 64 are provided on both sides of the upper end of the rod portion 62. The plug member 60 has the same structure as the filter member 54 except that the filter portion 57 is replaced by a disk-shaped flat plate 66. As shown in FIG. 2, the plug member 60 is suspended from the fixed beam 52 by the protrusion 64 engaging the upper surface of the fixed beam 52 with the rod-shaped portion 62 fitted in the notch 53 b of the fixed beam 52. Can be kept.

FIG. 4 is a perspective view showing the tank oil removing tool 70 of the present embodiment. The tank oil draining tool 70 is for confirming and replacing the packing member 59 arranged around the first oil supply pipe 37 connected to the bottom portion 36a of the tank 36 that stores the hydraulic oil for operating the hydraulic elevator 10. It is an instrument used.

As shown in FIG. 4, the tank oil removal tool 70 includes a partition member 72 and a pressing mechanism 74. The partition member 72 is preferably configured by, for example, a cylindrical resin pipe. The inner diameter of the partition member 72 is larger than the outer diameter of the packing member 59 installed on the bottom portion 36 a of the tank 36. The partition member 72 surrounds the first oil supply pipe 37 so as to partition the hydraulic oil in the upper region of the first oil supply pipe 37 connected to the bottom portion 36 a of the tank 36 from the hydraulic oil in the other region in the tank 36. In this case, it is pressed against the bottom portion 36a.

An elastic seal member 76 made of rubber, for example, is preferably attached to the lower end of the partition member 72. Accordingly, when the partition member 72 is pressed against the bottom portion 36a of the tank 36, it is possible to reliably prevent the hydraulic oil from entering the partition member 72 from the outside to the inside. The elastic seal member 76 may be fixed to the partition member 72 by winding a metal band, for example, or may be fixed by adhesion.

The pressing mechanism 74 includes a rod member 80 having one end connected to the partition member 72 and the other end having a male screw portion 78, and nuts 82 a and 82 b screwed to the male screw portion 78. The lower end of the rod-shaped member 80 of the pressing mechanism 74 is connected to the upper end of the partition member 72 by means of, for example, bolts and nuts via a gate-shaped bracket member 84. The pressing mechanism 74 can generate a pressing force on the rod-shaped member 80 by being tightened on the male screw portion 78 so that the lower nut 82a is pressed against the lower surface of the fixed beam 52. It should be noted that the upper nut 82b can be in a state in which the rod-shaped member 80 is stably held by the fixed beam 52 by tightening so that the fixed beam 52 is sandwiched between the upper nut 82b and the lower nut 82a.

Next, with reference to FIGS. 5 to 9, an operation for confirming and replacing the packing member 59 installed on the bottom portion 36a of the tank 36 by using the tank oil removing tool 70 having the above-described configuration will be described.

First, as shown in FIG. 5, an operator who checks the packing member 59 removes the filter member 54 and uses the plug member 60 instead to close the upper end opening of the first oil supply pipe 37. At this time, the upper end portion of the rod-shaped portion 62 of the plug member 60 is fitted into the cutout portion 53 a, and the protrusion 64 thereof is engaged with the lower surface of the fixed beam 52, so that the plate-shaped portion 66 causes the flat plate 66 to move to the first oil supply pipe 37. Is pressed against the upper end of the. Further, at this time, the packing portion 68 of the plug member 60 is pressed against the packing member 59 to seal the two and prevent hydraulic oil from flowing into the first oil supply pipe 37.

Next, as shown in FIG. 6, the worker installs the partition member 72 of the tank oil removing tool 70 around the packing member 59 arranged on the bottom portion 36 a of the tank 36. At this time, in the pressing mechanism 74, the nut 82a is tightened on the lower surface of the fixed beam 52 so that the screwing position of the lower nut 82a with respect to the male screw portion 78 is moved upward. F occurs. As a result, the elastic seal member 76 at the lower end of the partition member 72 is pressed against the bottom portion 36a, and the inflow of hydraulic oil from the outside to the inside is blocked at the lower end of the partition member 72. By installing the tank oil removing tool 70 in this manner, the operating oil in the upper region of the first oil supply pipe 37 in the tank 36 is separated from the operating oil in the other region of the tank 36 by the partition member 72. Partitioned.

Subsequently, as shown in FIG. 7, the worker uses the manual pump 90 to drain the hydraulic oil inside the partition member 72 and transfers it to a container 92 such as a pail can. As long as the container 92 has a capacity of about 20 liters, only one container 92 can store all the hydraulic oil inside the partition member 72.

After draining the hydraulic oil from the inside of the partition member 72, the operator removes the plug member 60 from the inside of the partition member 72, as shown in FIG. 8. As a result, the packing member 59 is exposed at the lower inside of the partition member 72. As a result, the operator can visually confirm the deterioration state of the packing member 59, and if it is judged that the packing member 59 needs to be replaced, the worker can remove the packing member 59 and replace it with a new one as shown in FIG.

After checking and replacing the packing member 59, the operator covers the upper end opening of the first oil supply pipe 37 with the filter member 54 as shown in FIG. The member 72 is gently lifted and removed. Then, the work is completed by returning the hydraulic oil once extracted to the container 92 to the tank 36.

As described above, according to the tank oil removing device 70 of the hydraulic elevator of the present embodiment, by extracting only the hydraulic oil inside the partition member 72, the packing member 59 installed on the bottom portion 36a of the tank 36 is provided. Can be confirmed and replaced. Therefore, as compared with the case where all the hydraulic oil in the tank 36 is once drained, the work can be performed easily and in a short time, and the work efficiency is significantly improved.

Actually, the work of extracting all the hydraulic oil from the tank 36 and checking the packing member 59 was carried out by preparing about 10 pail cans, electric pumps, extension cord reels, etc. in advance. It took 3 hours for a person (6 hours if converted by one worker). On the other hand, when the same work is performed using the tank oil draining tool 70 of the present embodiment, it is easy to prepare the tank oil draining tool 70 and the manual pump 90 in advance. It was confirmed that one worker alone can perform the work in 0.5 hours, and the work efficiency is significantly improved.

It should be noted that the present invention is not limited to the above-described embodiments and modifications thereof, and it is needless to say that various modifications and improvements can be made within the scope of the matters described in the claims of the present application. ..

10 hydraulic elevator, 12 hoistway, 16 elevator hall, 18 hall door, 20 car door, 22 support member, 24 rope, 26 bottom (of hoistway), 28 hydraulic actuator, 30 cylinder, 32 plunger, 34 machine room, 36 tank, 36a bottom (of tank), 37 1st oil supply pipe, 38 pump, 39 2nd oil supply pipe, 40 oil supply solenoid valve, 41 return pipe, 42 oil discharge solenoid valve, 44 pulley, 46 deflector wheel, 50 Control panel, 52 fixed beam, 53a, 53b notch, 54 filter member, 55, 62 rod-shaped part, 56, 64 protruding part, 57 filter part, 58, 68 packing part, 59 packing member, 60 plug member, 66 flat plate, 70 Tank oil removing device, 72 Partitioning member, 74 Pressing mechanism, 76 Elastic sealing member, 78 Male screw part, 80 Bar-shaped member, 82a, 82b Nut, 84 Bracket member, 90 Manual pump, 92 Container, F pressing force.

Claims (8)

A tank oil draining device for confirming or replacing a packing member arranged around an oil supply pipe connected to a bottom portion of a tank containing hydraulic oil for operating a hydraulic elevator,
A cylindrical section that is pressed against the bottom part around the oil supply pipe so that the working oil in the upper region of the oil supply pipe connected to the bottom part is separated from the hydraulic oil in the other region in the tank. Members,
A pressing mechanism that presses the partition member against the bottom portion, a device for removing oil from a tank of a hydraulic elevator. The tank oil draining device of the hydraulic elevator according to claim 1, wherein an elastic seal member is attached to a lower end portion of the partition member that is pressed against the bottom portion. The fixed beam is provided in the upper part of the said tank, The said pressing mechanism produces the pressing force with respect to the said partition member by engaging with the said fixed beam, The hydraulic elevator of Claim 1 or 2. Equipment for removing oil from tanks. The pressing mechanism includes a rod-shaped member having one end connected to the partition member and a male screw portion at the other end, and a nut screwed to the male screw portion, and the nut with respect to the fixed beam. The tank oil draining tool of the hydraulic elevator according to claim 3, wherein the rod-shaped member is pressed against the male screw portion so as to be pressed against the rod-shaped member to generate a pressing force. 5. The tank oil draining device for a hydraulic elevator according to claim 4, wherein the fixed beam is formed with a cutout portion into which the rod-shaped member is fitted. The tank member of the hydraulic elevator according to any one of claims 1 to 5, wherein the partition member is installed in a state in which an opening of the oil supply pipe connected to the bottom is closed with a plug member. Instrument. The hydraulic oil inside the partition member partitioned from the other region in the tank can be drained by a manual pump, and the tank oil draining device of the hydraulic elevator according to any one of claims 1 to 6. .. The tank oil for a hydraulic elevator according to claim 6 or 7, wherein the packing member is removed from the periphery of the oil supply pipe in a state where the plug member is removed after draining the working oil inside the partition member. Extraction device.

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