JP2633702B2 - Inspection method of hydraulic elevator power unit and sealing member for the inspection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to an inspection method for performing maintenance and inspection of a hydraulic pump and a flow control valve of a power unit for a hydraulic elevator, and a method for sealing piping at that time. The present invention relates to a sealing member for inspection which is used for:

(Prior Art) Generally, hydraulic elevators include a direct type in which a car is directly lifted and lowered by a hydraulic jack from directly below, and an indirect type in which a car is raised and lowered by using a hydraulic jack, a steel wheel, and a rope. . Each of these two types is provided with a power unit for driving a hydraulic jack.

FIG. 3 is a schematic configuration diagram of a direct hydraulic elevator, in which a hydraulic jack 2 has a cylinder 3 at the bottom of a hoistway 1 in a building.
The car 5 is directly supported on the plunger 4 and can be raised and lowered along the guide rail 6 in the hoistway 1. A power unit 7 as a drive source of the hydraulic jack 2 is generally installed in a machine room 8 adjacent to the hoistway 1. As shown in FIGS. 3 and 4, the power unit 7 includes an oil tank (tank) 10 installed on a pedestal (base) 9 and a hydraulic pump that sucks and discharges oil in the oil tank 10 through a filter 11. 12, an electric motor 13 for driving the hydraulic pump 12, a flow control valve 14 provided on the discharge side of the hydraulic pump 12, and a pipe connecting between this and the cylinder 3 of the hydraulic jack 2
15 and a silencer 16.

When the car 5 is raised, the oil in the oil tank 10 is suctioned through the filter 11 by the action of the hydraulic pump 12 by a control device (not shown), and the oil is piped while controlling the flow rate through the flow rate control valve 14 on the discharge side. From 15, the pressure is fed into the cylinder 3 of the hydraulic jack 2 in the hoistway 1. As a result, the plunger 4 of the jack 2 is raised, and the car 5 thereon is pushed up to the destination floor. On the other hand, when lowering the car 5, the control device switches the flow control valve 14,
The oil in the cylinder 3 of the hydraulic jack 2 is returned into the oil tank 10 while controlling the flow rate from the pipe 15 through the silencer 16 and the flow rate control valve 14 by the weight of the car 5 by its own weight. This causes the car 5 to descend to the destination floor together with the plunger 4 of the jack 2.

In such a power unit 7 of a hydraulic elevator, the hydraulic pump 12 and the flow control valve 14 are precision machines and require maintenance and inspection. In this case, the hydraulic pump 12 and the flow control valve
14 are connected to pipes 18 and 19 connecting
May need to be removed from the

When removing the hydraulic pump 12 and the flow control valve 14, transfer all the oil in the oil tank 10 to another tank, or remove the filter 11 and remove the pipes 18 and 19 penetrating through the bottom of the oil tank 10. The inspection stopper 20 shown in FIG. 5 is fitted into the upper end and sealed to prevent oil leakage.

The inspection plug 20 is formed by passing a solid screw rod 22 through the center of a rubber plug body 21 and tightening a pair of upper and lower nuts 24 and 25 screwed into the screw rod 22 through a washer 22. It is fixed to a rod 22. In this state, the stopper main body 21 is pushed into the upper ends of the pipes 18 and 19 by holding the upper end of the screw rod 22 to seal.

(Problems to be Solved by the Invention) By the way, as described above, the hydraulic pump 12
When removing the oil and flow control valve 14 from the pipes 18 and 19, transferring all the oil in the oil tank 10 to another tank requires a lot of time and labor to prepare another tank and transfer oil, which is inefficient. It is.

On the other hand, in the method in which the inspection plug 20 is fitted into the upper ends of the pipes 18 and 19 in the oil tank 10 and sealed as described above, the oil in the oil tank 10 can be prevented from flowing into the pipes 18 and 19, but the hydraulic pump When the flow control valve 12 and the flow control valve 14 are removed, the oil remaining in the pipes 18 and 19 flows out and spills around to deteriorate the workability.

The present invention has been made in view of the above circumstances, and when removing a hydraulic pump or a flow control valve from a pipe, it is not necessary to transfer the oil in the oil tank to another tank, and it is needless to say that the oil in the oil tank does not leak. Inspection method and inspection of hydraulic elevator power unit, which can reliably prevent residual oil in piping from leaking to the surroundings, and can perform maintenance and inspection work of hydraulic pumps and flow control valves etc. very efficiently and easily. It is an object to provide a sealing member for use.

[Configuration of the invention]

(Means for Solving the Problems) The inspection method of a hydraulic elevator power unit according to the first invention includes an oil tank, a hydraulic pump,
At the time of maintenance and inspection of a hydraulic elevator power unit having a flow control valve and the like, the pipe connected to the oil tank is sealed with a sealing member to stop the flow of oil from the oil tank to the pipe, and in this state, the oil flows through the sealing member. It is characterized in that the residual oil in the pipe is extracted while the outside air is sucked into the pipe, and then the hydraulic pump or the flow control valve connected to the pipe is removed for inspection.

The inspection sealing member of the hydraulic elevator power unit according to the second invention is mounted on a pipe connected to an oil tank of the hydraulic elevator power unit so that the sealing member is effective when used in the above-described inspection method. And an air suction hole that allows outside air to flow into the pipe.

(Operation) In the inspection method of the hydraulic elevator power unit according to the present invention having the above-described configuration, the pipe connected to the oil tank is sealed with a sealing member before removing the hydraulic pump or the flow control valve from the pipe for maintenance or the like. Thus, the flow of oil from the oil tank to the pipe is stopped, and in this state, residual oil in the pipe is extracted while external air is sucked into the pipe via the sealing member. In this state, the hydraulic pump or the flow control valve connected to the pipe is removed and the inspection is performed. Therefore, it is not necessary to transfer the oil in the oil tank to another tank, and the oil in the oil tank may leak. In addition, leakage of residual oil in the piping to the surroundings can be reliably prevented. Therefore, the maintenance and inspection work can be performed very efficiently and easily without fear of oil spilling around.

In addition, when the sealing member for inspection of the hydraulic elevator power unit of the present invention is used, the inflow of oil from the oil tank to the pipe is stopped, and the outside air is allowed to flow into the pipe from the air suction hole. The remaining oil from the lower hydraulic pump by inching or rotating it manually to drain it to the pump side, or provide a drain at the bottom of the pipe and open it to drain the residual oil from the pipe into an appropriate container. Will be able to do it easily. This makes it possible to implement the inspection method for the hydraulic elevator power unit described above.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. 1 and FIG. In the drawings, the same components as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and the description is simplified.

First, FIG. 1 is a diagram corresponding to FIG. 4 and shows a power unit 7 which is a drive source of a hydraulic elevator installed in a machine room as described above. The power unit 7 itself is substantially the same as the conventional one, and includes an oil tank 10 on a gantry 9, a hydraulic pump 12 disposed below the oil tank 10, a driving motor 13, a flow control valve 14, a pipe 15
And a silencer 16 and the like. The oil tank 10
There are pipes 18, 19 and a filter 11 for connecting between the hydraulic pump 12 and the flow control valve 14.

A drain 27 that can be opened and closed appropriately is provided below the pipe 19 that connects the oil tank 10 and the flow control valve 14.

In the power unit 7, when the hydraulic pump 12 and the flow control valve 14 are removed from the pipes 18 and 19 for maintenance and inspection, an inspection sealing member 30 for sealing the upper ends of the pipes 18 and 19 to prevent oil leakage. Is used.

This inspection sealing member 30 is shown in an enlarged manner in FIG. This inspection sealing member 30 is basically the same as the conventional inspection plug 20 shown in FIG. 4, and is made of rubber which is pushed into and fitted to the upper ends of the pipes 18 and 19 to seal. The main body is a sealing member main body 31 having a truncated cone shape. An air suction pipe 32 is provided through the upper and lower through holes 31a at the center of the sealing member body 31 from above. The air suction pipe 32 is a metal gas pipe having air suction holes (hollows) 32a at upper and lower ends, has considerable rigidity, and extends longer than the sealing member main body 31. A washer 33 is fixed to the lower end of the air suction pipe 32 by welding or the like, so that the sealing member body 31 can be pushed into the upper ends of the pipes 18 and 19 from above. At the lower end of the air suction pipe 32, a retaining member 34 such as a split pin is provided.
Are provided to prevent the sealing member body 31 from coming off.

A method of performing maintenance and inspection of the hydraulic pump 12 and the flow control valve 14 of the power unit 7 of the hydraulic elevator using the inspection sealing member 30 will be described. When removing the hydraulic pump 12 and the flow control valve 14 from the pipes 18 and 19, open the top plate of the oil tank 10 without performing inefficient operations such as transferring oil in the oil tank 10 to another tank. As shown in FIG. 1, the sealing member main body 31 is pressed into the upper ends of the pipes 18 and 19 by holding the upper end member of the air suction pipe 32 of the inspection sealing member 30 from above. In this case, the filter 11 is removed and set. With this, piping 18,1
The upper end of 9 is sealed by a sealing member body 31. The air suction pipe 32 penetrating the sealing member main body 31 is long upward,
The upper end protrudes above the oil level in the oil tank 10 and is open to the atmosphere. Thus, the oil in the oil tank 10 does not flow into the air suction pipe 32, and the leakage of the oil in the oil tank 10 is completely prevented.

In this state, the hydraulic pump 12 or the flow control valve
Although there is residual oil in the pipes 18 and 19 up to 14, since the upper part communicates with the atmosphere through the air suction holes 32a of the air suction pipe 32, the air is discharged from the pipes 18 and 19 through the air holes 32a. And the residual oil in the pipes 18 and 19 flows down to the hydraulic pump 12 and the like. At that time, if the hydraulic pump 12 is rotated by inching or manual operation, the residual oil in the pipe 18 smoothly flows down to the hydraulic pump 12 side. Also, piping 19 on the flow control valve 14 side
The residual oil inside can be smoothly drained to an appropriate container by opening the drain 27 below the pipe 19.

After the residual oil is removed from the pipes 18 and 19 in this way, the hydraulic pump 12 and the flow control valve 14 are removed from the pipes 18 and 19. Thus, there is no fear of oil spilling around, and the maintenance and inspection work of the hydraulic pump 12 and the flow control valve 14 can be performed very efficiently and easily.

In addition, the sealing member 30 for inspection of the hydraulic elevator power unit of the present invention is not limited to only the one in the above-described embodiment, but is not shown but may be, for example, a three-way switching valve previously assembled in the middle of the pipes 18 and 19. It is possible. By switching the valves, the pipes 18 and 19 are cut off from the oil tank 10 and at the same time, it is possible to allow the outside air to flow into the pipes from above.

〔The invention's effect〕

Since the inspection method of the hydraulic elevator power unit of the present invention is configured as described above, when removing the hydraulic pump and the flow control valve from the pipe, the oil in the oil tank is not transferred to another tank, and the oil is removed from the oil tank and the pipe. Oil leakage can be reliably prevented, and an effect that maintenance and inspection work of the hydraulic pump, the flow control valve, and the like can be performed very efficiently and easily can be obtained.

Since the inspection sealing member of the hydraulic elevator power unit of the present invention is configured as described above, it is very effective in executing the inspection method.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an inspection method of a hydraulic elevator power unit showing one embodiment of the present invention, FIG. 2 is a side view of an inspection sealing member used in the inspection method, with a part omitted, and FIG. FIG. 4 is a schematic view of a power unit of the hydraulic elevator, and FIG. 5 is a side view of a hydraulic elevator power unit showing a conventional example in which a check plug is partially omitted. 7 ... Hydraulic elevator power unit, 10 ... Oil tank, 12
…… Hydraulic pump, 14 …… Flow control valve, 18,19 …… Piping, 30
…… Inspection sealing member, 31 …… Sealing member main body, 32a …… Air suction hole.

Claims (2)

(57) [Claims] At the time of maintenance and inspection of a hydraulic elevator power unit having an oil tank, a hydraulic pump, a flow control valve and the like, a pipe connected to the oil tank is sealed with a sealing member to stop oil from flowing into the pipe from the oil tank. In this state, while sucking outside air into the pipe through the sealing member, the residual oil in the pipe is extracted, and then the hydraulic pump or the flow control valve connected to the pipe is removed and inspection is performed. Inspection method of hydraulic elevator power unit. 2. A hydraulic elevator power unit having an air suction hole which is mounted on a pipe connected to an oil tank to stop the flow of oil from the oil tank to the pipe and allows outside air to flow into the pipe. A sealing member for inspection of a hydraulic elevator power unit.