JPH0947973A - Gland part packing removing device for hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gland packing removing device for a hydraulic elevator by a method wherein a single air pump is caused to cope with an air bleed hole comprising a tapered pipe thread or a meter thread. SOLUTION: An attachment 36 joined in a screwed-in state with a second coupler 35 forming the tip part of the hose 33 of an air pump 30 and an attachment 36 joined in a screwed-in state with an air bleed hole 8 of a gland part 3 is provided. The attachment 36 corresponding to the screw part of the air bleed hole 8 being an object is joined in a screwed-in state with the second coupler 35 of the air pump 30. Compressed air of the air pump 30 is fed to an air bleed hole 8 through the attachment 36, and by pressurizing the bottom of a packing 5, the packing 5 is pushed out from the gland part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing removing device for a gland portion provided on a jack of a hydraulic elevator.

[0002]

2. Description of the Related Art Generally, a hydraulic elevator is equipped with a jack for raising and lowering a car. This jack is used in a hoistway as shown in FIG. 9 which is a partial sectional view showing a state of a gland portion before removing a packing. It is composed of a cylinder 1 fixed inside, and a plunger 2 slidably provided on the cylinder 1 for raising and lowering a car.
A gland portion 3 that seals a gap 20 between the plunger 2 and the cylinder 1 is formed at the upper end of the cylinder 1.
The gland portion 3 includes a substantially cylindrical base portion 3a that is bolted to the upper end of the cylinder 1, a cylindrical metal 4 that is inserted inside the base portion 3a and guides the plunger 2, and above the metal 4. A ring-shaped packing 5 which is inserted and seals a gap 20 between the inner peripheral surface of the cylinder 1 and the outer peripheral surface of the plunger 2, and a packing retainer 6 which is mounted on the upper end of the base 3a and holds the packing 5. A bolt 7 and a nut 7a for fastening the packing presser 6 to the base 3a, an air plug 9 for closing an air vent hole 8 penetrating the base 3a and the metal 4, and a foreign matter which is fitted inside the packing presser 6 and enters the cylinder 1. The ring-shaped dust seal 10 that prevents the dust seal 10 from being pressed, and the seal that is held by the packing retainer 6 and the nut 7a to retain the dust seal 10. And a like Le retainer 11.

When the inner peripheral surface of the packing 5 becomes significantly worn over time as the plunger 2 moves up and down, the sealing property of the packing 5 deteriorates, and the oil in the cylinder 1 leaks, and the speed characteristic of the car changes. Since it causes deterioration, it is necessary to replace the packing 5 with a new one.
A method of removing the packing 5 when replacing the packing 5 is shown in FIG. 10, which is a partial sectional view. This is done by removing the nut 7a of the gland part 3,
Attach the dust seal 10 and the packing retainer 6 to the base 3a.
The rod-shaped jig 12 with a sharp tip is inserted into the packing 5 and is cut out.
This is done for each of the three packings 5. However, in the method using the rod-shaped jig 12, the packing 5
In addition to the fact that a large force is required to insert the packing 5 into and pull out the packing 5, the drawing operation is difficult and time-consuming, and there is a risk that the tip of the rod-shaped jig 12 may damage the plunger 2.

From the above, Japanese Patent Laid-Open No. 6-1158
Japanese Patent Laid-Open No. 56-56 proposes a packing removing method shown in FIG. In this packing removing method, an air pump 21 is configured by including a manual operation section 22 and a hose 23 that guides compressed air, and a coupler provided at the tip of the hose 23 that is an air outlet is used to remove air from the air vent hole 8 described above. The manual operation part 2 of the air pump 21 is screwed and connected to a screw hole formed by a taper screw for a pipe for the stopper 9.
By the pressing operation of 2, compressed air is supplied to the air vent hole 8 to push the packing 5 upward and remove it.

12 and 13 show a gland portion of a type in which the air vent hole 8 is closed with a ball, FIG. 12 is a partial sectional view showing a state before removing the packing, and FIG. 13 is a state during removing the packing. FIG. This gland part is an air vent hole 8 of the gland part 3.
A ball 39 that closes the air vent hole 8 and an air stopper 9 that presses and holds the ball 39 are provided inside, and the screw hole of the air vent hole 8 into which the air stopper 9 is screwed is formed by a metric screw. They are different. At the time of removing the packing 5, as shown in FIG. 13, the air stopper 9 is loosened and the ball 39 is moved by its own weight to remove the air vent hole 8
In the state in which is opened and air is removed, the packing 5 is removed by using the rod-shaped jig 12 as in the case of FIG.

[0006]

However, in the conventional method for removing the packing of the gland portion of the hydraulic elevator described above, the packing is removed using the air pump 21 shown in FIG. 11, but the operation is simple. However, it can be used only for the plunger having the air vent hole 8 that matches the screw diameter of the coupler provided at the tip of the hose 23 of the air pump 21, and the screw diameter of the air vent hole 8 varies depending on the size of the hydraulic elevator. If they are different, separate air pumps 21 have to be prepared for the air vent holes 8 having different screw diameters, which requires facility costs. Further, in the one shown in FIG. 13, the screw of the air vent hole 8 is a metric screw, whereas the screw of the coupler provided at the tip of the hose 23 of the air pump 21 which has been conventionally used is a taper screw for pipes. Therefore, the air pump 21 could not be used.

It is an object of the present invention to provide a gland packing removing device for a hydraulic elevator, which allows one air pump to cope with air vent holes composed of different pipe taper threads or metric threads. .

[0008]

In order to achieve the above object, the present invention has an air plug which is closed by screwing into an air vent hole of the gland part after removing a packing retainer of a gland part provided in a jack. The compressed air from the air pump is supplied to the air vent hole through a coupler forming the air blowout part of the air pump, and the compressed air pressurizes the bottom of the packing to push the packing out of the gland part. In the device for removing the gland portion packing of the hydraulic elevator, an attachment that can be screwed into the air vent hole is detachably attached to the coupler of the air pump.

[0009]

In the device for removing and packing the gland portion of the hydraulic elevator according to the present invention, since the attachment capable of being screwed into the air vent hole is detachably attached to the coupler as described above, the thread portion of the air vent hole of the gland portion has a pipe taper screw or Even with a metric screw, it suffices to connect an attachment having a threaded portion matching them to the coupler of the air pump, so that one air pump can handle threaded portions having different air vent holes.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view showing a gland part packing removing device of a hydraulic elevator according to an embodiment of the present invention. A gland portion 3 that seals a gap between the plunger 2 and the cylinder 1 is provided at an upper end portion of the cylinder 1.
The same parts as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. Air vent hole 8 penetrating base 3a and metal 4
An air pump 30 is connected to the air pump 30. The air pump 30 has a manual operation section 31 that is pushed and pulled as shown in the side view of FIG. A piston portion 32 for compressing air,
A hose 33 for guiding compressed air in the piston portion 32,
The first coupler 34 attached to the tip of the hose 33
And a second coupler 35 screwed with the first coupler 34 and having a pipe taper screw portion 35a at the end portion that fits into the air vent hole 3 of the ground portion 3. FIG.
FIG. 6 is a cross-sectional view of an attachment that is detachably attached to the second coupler 35. The attachment 36 has a screw hole 36a that can be screwed into a screw portion 35a of the second coupler 35 on one side, and the other side. Has a taper thread portion 36b for pipe smaller than the thread diameter of the thread portion 35a of the second coupler 35, while the attachment 37 can be screwed to the thread portion 35a of the second coupler 35 on one side. Has a simple screw hole 37a, has a metric screw portion 37b formed on the other side to fit an air vent hole formed by a metric screw, and has an O-ring 37c for sealing at the neck portion.

When the packing 5 is to be removed from the gland portion 3 shown in FIG. 1, the packing retainer and the like of the gland portion 3 provided on the jack composed of the cylinder 1 and the plunger 2 are first removed to close the air vent hole 8. Remove the air plug that was installed. Next, the screw portion 3 a of the attachment 36 is attached to the screw portion 35 a of the second coupler 35 of the air pump 30.
6a is screwed together, the attachment 36 is attached to the tip of the second coupler 35, and the screw portion 36b of the attachment 36 is attached.
Is screwed into the taper screw portion of the air vent hole 8. When the manual operation part 31 of the air pump 30 is operated in this state, the compressed air in the piston part 32 is supplied to the air vent hole 8 through the hose 33, the first coupler 34, the second coupler 35 and the attachment 36. The pressure received by the compressed air pushes the packing 5 upward,
Remove this. Further, in a hydraulic elevator of a different model from that described above, when the screw portion 35a of the second coupler 35 of the air pump 30 directly fits the screw of the air vent hole of the hydraulic elevator, the attachment 36 is not attached and The threaded portion 35a of the second coupler 35 can be screwed into the taper threaded portion for the pipe of the air vent hole 8 to remove the packing 5 in the same manner.

By thus preparing at least one attachment 36 in advance, one air pump can be used to correspond to the air vent holes composed of a plurality of different pipe taper screws, and packing of a plurality of types of hydraulic elevators is possible. Even in the case where the replacement of the packings 5 is carried out sequentially, it is sufficient to bring the small-sized attachment 36 together with the air pump 30, so that the packing 5 can be easily carried to the replacement site.

FIG. 4 is a partial cross-sectional view of a gland portion in which the air vent hole 8 is closed with a ball. Prior to the replacement of the packing 5, the air stopper 9 is first removed. The tool 38 used at this time is an L-shaped hexagon wrench as shown in detail in FIG. 7, and the tip of the body 38a is It has a hexagonal shape that engages with a hexagonal hole formed in the air plug 9 that closes the air vent hole 8, and the tip of the body portion 38a is formed into the spherical surface of the ball inserted into the air vent hole 8. It is formed on the corresponding concave surface 38b and is magnetized.

When removing the packing 5, first, the packing retainer or the like of the gland portion 3 is removed, and then the tip of the tool 38 is engaged with the hexagonal hole of the air stopper 9 to remove the tool 38.
Is rotated to remove the air stopper 9 having the metric thread portion. As a result, the ball 9 that has closed the air vent hole 8 falls into the air vent hole 8 by its own weight, so that the tip of the tool 38 is inserted into the air vent hole 8 as shown in FIG. The concave surface 38b is brought close to the ball 39. At this time, since the concave surface 38B of the tool 38 is magnetized, the ball 39 is attracted to the concave surface 38b and the tool 3
When 8 is pulled out, the ball 39 can be taken out together without dropping. Next, as shown in FIG. 6, the screw portion 37a of the attachment 37 for the metric screw shown in FIG. 3 is screwed into the screw portion 35a of the second coupler 35 attached to the hose 33 of the air pump 30, The attachment 37 is attached to the tip of the second coupler 35. next,
When the thread portion 37b of the attachment 37 is screwed into the metric thread portion of the air vent hole 8 and the manual operation portion 31 of the air pump 30 is operated, the compressed air in the piston portion 32 causes the hose 33, the first coupler 34, the second coupler Is supplied to the air vent hole 8 through the coupler 35 and the attachment 37 of the above, and the compressed air pushes the packing 5 upward, and it can be easily removed.

As described above, by preparing the attachment 37 for the metric screw in advance, the air pump 30 having the same second coupler 35 can be used for the air vent hole 8 formed of the metric screw. It is possible to easily remove the packing 5. Further, as shown in FIG. 8, since the attachment 37 has the O-ring 37c on the base side of the screw 37b screwed into the metric screw portion of the air vent hole 8, the attachment 37 is screwed into the air vent hole 8 and the air pump 30 is attached. When the compressed air is supplied to the air vent hole 8 by the O-ring 37c, the compressed air is not leaked to the outside of the air vent hole 8.

[0016]

As described above, in the device for removing and packing the gland part of the hydraulic elevator according to the present invention, the attachment having the thread part corresponding to the thread part of the air vent hole of the gland part can be detached to the coupler provided in the air pump. Since only one air pump can be connected to the air vent holes composed of different taper threads for pipes or metric threads, only by changing the attachment.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a gland part packing removing device of a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a front view showing only the gland packing removing device shown in FIG.

FIG. 3 is a cross-sectional view of an attachment mounted on the gland packing removing device shown in FIG.

FIG. 4 is a partial cross-sectional view showing another gland portion during an initial preparation work before connecting the gland portion packing removing device shown in FIG.

FIG. 5 is a partial cross-sectional view showing another gland portion during the final preparation work before connecting the gland portion packing removing device shown in FIG. 4;

FIG. 6 is a partial cross-sectional view showing another gland portion in a state where the gland portion packing removing device shown in FIG. 4 is connected.

FIG. 7 is a front view of a tool used for initial preparation work for the gland portion shown in FIG.

8 is a cross-sectional view of an attachment to be mounted on the gland packing removing device shown in FIG.

FIG. 9 is a partial cross-sectional view of a gland portion of a general hydraulic elevator.

FIG. 10 is a partial cross-sectional view of a gland part adopting a conventional gland part packing removing method.

FIG. 11 is a partial cross-sectional view of a gland part adopting another conventional gland part packing removing method.

FIG. 12 is a partial cross-sectional view showing another gland portion of a general hydraulic elevator.

FIG. 13 is a partial cross-sectional view showing a preparatory work before connecting the gland part packing removing device of the gland part shown in FIG. 12;

[Explanation of symbols]

 2 Plunger 3 Gland part 5 Packing 8 Air vent hole 9 Air plug 30 Air pump 33 Hose 35 Second coupler 36, 37 Attachment 38 Tool 39 Ball

Claims (4)

[Claims] 1. After removing the packing retainer of the gland portion provided on the jack, the air plug that is screwed into and closed the air vent hole of the gland portion is removed, and a coupler forming an air blowing portion of the air pump is used. The compressed air from the air pump is supplied to the air vent hole, and the compressed air pressurizes the bottom of the packing to push the packing out of the gland section. A gland section packing removing device for a hydraulic elevator, wherein an attachment which can be screwed into the air vent hole is detachably attached to the coupler of the air pump. 2. The attachment according to claim 1, wherein the attachment has a screw portion screwed into a screw portion of the coupler and a screw portion screwable into the air vent hole. Equipment for removing and packing gland of hydraulic elevator. 3. The screw according to claim 1, wherein the air vent hole is closed by screwing the air plug into the taper thread portion of the pipe, and the attachment is screwed into the thread portion of the coupler. And a threaded portion capable of being screwed into the taper threaded portion for pipe of the air vent hole, a gland portion packing removing device for a hydraulic elevator. 4. The device according to claim 1, wherein the gland portion is closed by an air plug screwed into a metric thread portion of the air vent hole through a ball, and the attachment is attached to a thread portion of the coupler. A threaded portion to be screwed,
A gland section packing removing device for a hydraulic elevator, characterized in that it has a threaded portion that can be screwed into the metric threaded portion of the air vent hole.