JPH11221723A - Forcing device for use in replacing method of boss fitted on shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forcing device that is used in a boss replacing method to allow a smooth press of a boss onto a shaft and prevents any displacement of the shaft except in its axial direction. SOLUTION: The forcing device comprises legs 42 each pressed at their one end against the end face of a boss 2b in a sheave 2, a reaction receiving plate 43 to which the other end of each leg 42 is fixed, a hydraulic ram 44 placed outside the middle of the reaction receiving plate 43, a rodlike member 45 inserted in the hydraulic ram 44 and reaction receiving plate 43, and a butt plate 48 secured to the end face of a shaft 4. The hydraulic ram 44 is driven to tension the shaft 4 by way of the rodlike member 45 and butt plate 48 and then to press the boss 2b onto the shaft 4 from one end with the resultant reaction. Even when the boss 2b butts against a step of the shaft 4 to cause an impulsive force, the resultant reaction is transmitted to the end of the shaft 4 only axially by way of the rodlike member 45 and butt plate 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting device used in a method of replacing a boss fitted on a shaft.
The present invention relates to a press-fitting device suitable for exchanging a boss forming a central portion of a heavy object such as an elevator sheave in a narrow working space in a building.

[0002]

2. Description of the Related Art In general, a boss forming a part of a heavy object is fitted into a shaft and installed in a building. A so-called gearless hoist that is not provided is widely known as a typical example. As this type of elevator gearless hoist, for example, as described in JP-A-50-306, JP-A-61-101577 and JP-A-62-179281, It has been proposed that an electric motor is installed on the upper part, a hoisting sheave and a brake drum are mounted on an extension formed by extending one end of a rotating shaft of the electric motor, and both ends of the rotating shaft are respectively supported by a pair of bearings. ing.

In general, when a basic assembly of a gearless hoist as described above is performed, a large crane is used in a factory, a stator of an electric motor is set on a base, and a rotor is mounted in the stator. Insert along the direction,
The bearings are assembled.

In such a series of assembling operations, the method of mounting the sheave and the brake drum on the extension of the rotary shaft is performed by supporting the rotary shaft upright so that the extension is located at the upper portion. At the same time, the sheave and brake drum are heated in a large electric furnace so that the inner diameter of the boss hole of these sheave and brake drum is sufficiently larger than the outer diameter of the rotating shaft. Remove the drum from the electric furnace, engage the sheave and the boss hole of the brake drum with the extension of the rotating shaft, lower the sheave and the brake drum vertically by their own weight, and attach the sheave and the brake drum to the rotating shaft. It has become. In the disassembly of the gearless hoist described above, no actual example in which the sheave and the brake drum are detached from the rotating shaft has been known.

For example, when the gearless hoist described above is installed on the top floor of a building, and when it is necessary to disassemble and assemble the stator and the rotor for maintenance, disassembly cleaning or repair, etc., Generally, temporary lifting equipment including supporting columns and supporting beams is provided around the machine, and disassembly and assembly are generally performed in the same manner as in the above-described factory.

However, in the above-described conventional disassembling and assembling method, the hoisting sheave and the brake drum insert the rotor mounted on the same shaft into the stator or pull out the rotor from the stator. A long disassembly / assembly space that is at least twice as long as the length in the core direction is required. Also, there is a problem that a great deal of labor is required to provide the temporary lifting equipment in an elevator machine room or the like above the building. In addition, instead of temporary lifting equipment, it is conceivable to provide dedicated lifting and moving equipment for heavy objects.However, it is necessary to increase the volume and strength of the elevator machine room. Not economic.

For example, a trolley beam may be installed on the ceiling of an elevator machine room, and a hoist may be installed on the trolley beam. However, when the trolley beam is installed, the trolley beam is already installed on the ceiling of the elevator machine room. It is necessary to relocate the installed air conditioning duct and return the above air conditioning duct to its original position after replacing the hoisting sheave, and these construction costs are in addition to the operation costs of the sheave replacement itself. Therefore, there is a problem that it is not economical and the elevator stops for a long time. Moreover, when a heavy load such as a hoisting sheave is suspended via a flexible cable such as a wire lobe or a chain by a lifting machine movably provided on the ceiling of the elevator machine room, the above hoisting sheave is Easy to swing,
That is, since it is extremely difficult to stably move the hoisting sheave in a centered state, it is difficult to assemble with accuracy in the centered state, and there is a problem that a heavy load is imposed on an operator.

[0008] Further, the gearless hoist has been increased in size with the rise of buildings, the speed of elevators, and the increase in transportation capacity, and moreover, a plurality of gearless hoists have been installed in parallel. In the elevator machine room provided on the top floor of a car, etc., a space necessary for normal maintenance and maintenance, that is, 1 m, is provided between one gearless hoist and another adjacent gearless hoist.
It is difficult to secure the above-mentioned disassembly / assembly space because only the above-mentioned space is secured.

Conventionally, as a means for solving such a problem, for example, as disclosed in Japanese Patent Application Laid-Open No. 8-81164, a gearless hoist for an elevator is disassembled without using a lifting means such as a crane. -A method of performing an assembly operation has been proposed. According to this conventional method, since the disassembly and assembly work of the elevator gearless hoist can be performed without using a lifting means such as a crane, the space required for the disassembly and assembly can be reduced, and the rotor itself is stabilized. Since the structure is very suitable for supporting in a state, it is excellent in that safety during disassembly and assembly work can be ensured.

In general, in an elevator machine room in which this kind of gearless hoist is installed, a large amount of heat is generated from a prime mover installed in the elevator machine room.
If the temperature in the elevator machine room is not lowered below a predetermined temperature, for example, a control device including many electronic devices will be adversely affected, so a relatively large air conditioner is installed. . However, since there is not enough space in the elevator machine room, the above-mentioned air conditioner for the elevator machine room is installed in an external room where another air conditioner is installed, and the duct connected to this air conditioner is installed in the elevator machine room. The air is drawn into the machine room, and cool air is sent into the elevator machine room via a duct installed on the ceiling of the elevator machine room. In particular, since the construction of this air-conditioning system is performed after the installation of the elevator is completed, the above-mentioned duct is erected above the hoisting machine, which easily secures a duct mounting dimension to the equipment in the elevator machine room and the ceiling. That is the reality. Therefore, as described above, when trying to erection the trolley beam on the ceiling of the elevator machine room, transfer the air conditioning duct already installed on the ceiling of the elevator machine room, and replace the air conditioning duct after replacing the hoisting sheave. It is necessary to perform the work of returning to the original position.

[0011]

In the conventional method of disassembling and assembling an elevator gearless hoist without using the above-mentioned lifting means such as a crane, the conventional method is provided for each gearless hoist. Since the mass of the rotor of this type of gearless hoist is extremely heavy, about 1 to 3 tons, unless the centering support member for supporting the rotor is very strong, the safety is high. Not preferred. Accordingly, the production cost of the gearless hoist becomes expensive to make the parts configuration corresponding to this, and there is a problem that it is not economical considering the frequency of use.

In general, when a sheave of a gearless winder is heated and fitted to a rotary shaft, a gap between a boss hole of the sheave and the rotary shaft is only about 0.1 to 0.2 mm. Since the sheave and the centering of the rotating shaft are slightly out of alignment, and once it is hard, once the sheave has begun to cool, the above gap becomes smaller with the passage of time. It becomes impossible to press-fit into or pull out from the rotating shaft. In this case, it is necessary to repeat the above-mentioned heating treatment, and a heavy load is imposed on the operator due to the press-fitting of the sheave. There is also. Therefore, when the sheave is press-fitted into the rotary shaft, there is a strong demand for a device capable of maintaining the centering state of the sheave and the rotary shaft. For this reason, in the above-mentioned conventional method, when replacing the sheave provided in the gearless winder, the support / centering means for supporting the rotating shaft and the sheave independently and for centering, and And moving means for moving the sheave along the axis.

In general, disassembly and assembly work of a gearless hoist is performed in a narrow elevator machine room or the like after being installed in a building, and in a situation where another adjacent gearless hoist is operating. Therefore, it is necessary to pay sufficient attention to safety. In addition, it is necessary to end the work in a short period of time in order to avoid stopping the elevator for a long time.

The present invention has been made in view of such a situation in the prior art, and has as its object to facilitate the press-fitting operation of the boss and to displace the shaft in a direction other than the axis at the time of the press-fitting operation. It is an object of the present invention to provide a press-fitting device that can be used in a method of replacing a boss fitted on a shaft, which can prevent the boss.

[0015]

In order to achieve the above object, according to the first aspect of the present invention, an existing boss fitted at both ends to a shaft held by a pair of bearings is pulled out from the shaft. Then, in a press-fitting device used for a method of replacing a boss fitted on a shaft, a newly prepared boss separately prepared is press-fitted onto the shaft, and each of the bosses is extended along the axis direction of the shaft. A plurality of legs abutting on one end side of the boss, the other end of the plurality of legs fixed, and a reaction force receiving plate disposed outside the end surface of the shaft; A center hole type hydraulic ram provided outside the
A rod inserted into the hydraulic ram and the reaction force receiving plate; a nut screwed into one end of the rod; a nut abutting on a tip of the hydraulic ram; and a nut screwed into the other end of the rod; The structure includes a contact plate attached to the end face of the shaft, and a hydraulic source for supplying pressure oil to the hydraulic ram.

In the present invention constructed as described above, the hydraulic ram is driven to pull out the end of the shaft via the rod-shaped body and the contact plate, and the boss is pressed from one end by the reaction force, whereby the hydraulic pressure is reduced. The boss press-fitting operation can be performed smoothly using the boss. Also, when the boss abuts against the stepped portion of the shaft to generate an impact force, the reaction force is applied only to the shaft end through the rod-shaped body and the contact plate in the shaft center direction. Displacement other than the direction can be prevented. Thereby, the above-described impact force propagates to the bearing via the shaft, but the shaft does not need to be displaced in a direction other than the axis direction, that is, since no displacement occurs between the shaft and the bearing, Damage to this bearing can be prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a press-fitting device used in a method of replacing a boss fitted on a shaft according to the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a gearless hoist in which bosses are exchanged by using a press-fitting device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a state in which a brake is removed from the hoist of FIG. FIG. 3 is a diagram showing a state where the bearing is removed from one end of the shaft of the hoist of FIG. 2, FIG. 4 is a diagram showing a state where a second boss support member is provided, and FIG. FIG. 6 is a view showing a state in which a first boss support member is removed, FIG. 6 is a view showing a state in which a sheave extracting device is provided, and FIG. FIG. 8, FIG. 8 shows a state in which the sheave has been pulled out, FIG. 9 shows a state in which the sheave has been removed from above the second boss support member, and FIG. 10 shows a state in which the centering of the new sheave is confirmed. FIG. 11 and FIG. 11 are views showing a state where a new sheave is subjected to a heat treatment. 2 shows a state in which a sheave press-fitting device is provided, FIG. 13 shows a state in the process of press-fitting a new sheave, and FIG. 14 shows a state in which a shaft support member is removed in the process of press-fitting a new sheave. 15 is a view showing a state in which the press-fitting of the new sheave is completed, FIG. 16 is a view showing a state in which the sheave press-fitting device is removed after the press-fitting of the new sheave is completed, and FIG. 17 is a first boss support member. FIG. 18 is a view showing a state in which a second boss support member is removed, FIG. 19 is a view showing a state in which a bearing is reattached to one end of a shaft, and FIG. 20 is a view showing a first state. FIG. 21 is a view showing a state in which the boss support member is removed, FIG. 21 is a view showing a state in which the brake is mounted again, FIG. 22 is a view for explaining main parts in FIG. 6, and FIG. 23 is a view for explaining main parts in FIG. ,
24 is a sectional view taken along line AA of FIG. 23, and FIG.
3 is a cross-sectional view taken along the line BB of FIG. 3, FIG. 26 is a cross-sectional view of a center hole hydraulic ram provided in the sheave pulling-out device, FIG. 27 is a diagram for explaining a main part of FIG. 13, and FIG. FIG. 29 is a sectional view of a center hole type hydraulic ram provided in the sheave press-fitting device.

The gearless hoist shown in FIG. 1 is a base 1 installed on a floor 1a of an elevator machine room (not shown).
A motor 3 detachably mounted on the base 1 by bolts (not shown), a winding sheave 2 mounted on a shaft of the motor 3, that is, a shaft 4, and a bolt (not shown) on the base 1. Removably mounted,
A pair of bearings 5a and 5b for rotatably supporting both ends of the shaft 4 and a removably mounted upper part of one of the bearings 5a by a bolt (not shown).
and a brake 6 having an arm 6a that can be engaged with the brake 6a.

The above-mentioned sheave 2 is provided, for example, in an elevator, and a wire rope (not shown) is wound therearound.
Are integrally formed. A boss 2b into which the shaft 4 is fitted is integrally formed at the center of the sheave 2, and a plurality of, for example, six cast holes are provided at equal intervals between the boss 2b and the outer peripheral portion. 2c is provided.

When the boss 2b of the sheave 2 is replaced, the first boss support member 7 shown in FIG. 2 and the like and the press-fitting device 12 of the present embodiment shown in FIG. A second boss support member 8, a drawing device 9 shown in FIG. 6, etc., a shaft support member 10 shown in FIG. 7, etc., and a heating device 11 shown in FIG. 11 are used.

The first boss support member 7 described above is fixed on the base 1 using a bolt hole (not shown) for mounting the brake arm 6a on the base 1, and the outer peripheral surface of the brake drum 2a is positioned on both lower sides. To support the sheave 2.

The second boss support members 8 extend in the axial direction of the shaft 4, and have one end mounted on the base 1 and the other end outside the end of the base 1. And a pair of guide rails 13 projecting to the floor 1
a, and a pair of guide members 15 movably provided on the guide rails 13, and a pair of guide members 15 mounted on the pair of guide members 15, respectively. A pair of receiving bases 16 each having a tapered surface 16a that comes into contact with the outer peripheral surface of the sheave 2, and a pair of plate bodies 1 provided on the other end side of the guide rail 13, respectively.
7, a bolt 18 inserted into the pair of plate members 17,
The plate 17, the bolt 18, and the nut 19 constitute guide rail adjusting means for adjusting the interval between the pair of guide rails 13. . The guide rail 13 is fixed by a screw hole (not shown) provided for attaching the bearing 5a to the base 1. In the second boss support member 8 configured as described above, the interval between the pair of guide rails 13 is increased by tightening the nut 19, so that the interval between the pair of receiving bases 16 is also increased and the sheave that slides on the tapered surface 16a. 2 moves downward, and conversely, by loosening the nut 19, the distance between the pair of guide rails 13 is reduced.
6, the sheave 2 slidingly in contact with the tapered surface 16a moves upward. Thus, centering of the sheave 2 in the vertical direction, that is, centering of the boss 2b in the vertical direction can be performed.

As shown in FIG. 23, the drawing device 9 described above is attached to one end of the shaft 4 with a bolt (not shown), and the through hole 20c of the cast hole 2c of the sheave 2 is opposed.
And a plurality of center hole hydraulic rams 22 provided outside the reaction force receiving plate 21
A plurality of rods 23 inserted through the hydraulic ram 22, the through-hole 20 of the reaction force receiving plate 21, and the cast hole 2 c of the sheave 2, and nuts 24 screwed to both ends of the rod 23, respectively. 25, a pressurizing body 26 interposed between the nut 25 and the end face of the sheave 2, and a hydraulic source 29 for supplying hydraulic oil to the hydraulic ram 22 through a distributor 27 and a hydraulic hose 28.
It consists of

The number of the hydraulic rams 22 is set to, for example, the same as the number of the cast holes 2c, that is, six, and each of the hydraulic rams 22 has a rod-like body 23 as shown in FIG. A cylinder 31 provided at the center with a center hole 30 through which a piston is inserted, a plunger 32 provided to be able to enter and exit the cylinder 31, and an oiling portion 33 provided at one end of the cylinder 31 and connected to a hydraulic hose 28 Has become. In the hydraulic ram 22, when the pressure oil discharged from the oil pressure source 29 flows into the cylinder 31 from the lubrication unit 33 via the hydraulic hose 28, the oil amount in the cylinder 31 increases in accordance with the flow amount of the pressure oil. And plunger 3
2 is pushed to the left in FIG. Along with this, the nut 24 is pressed to the left in FIG. 26, and the rod 23 screwed with the nut 24 is driven, so that a pulling force is applied to the sheave 2 via the pressurizing body 26.

The distributor 27 uniformly distributes the pressure oil discharged from the hydraulic source 29 to the respective hydraulic rams 22. The discharge pressure of the hydraulic source 29 is applied to the input side of the distributor 27. It is preferable in terms of work to provide a pressure gauge (not shown) for measuring the pressure.

As shown in FIG. 25, the shaft support member 10 includes a pair of base plates 34 attached to the base 1 using screw holes (not shown) provided for attaching the brake arm 6a to the base 1. A pair of support portions 3 rotatably attached to the pair of base plates 34 via pins 35, respectively.
6, a disk-shaped receiving portion 38 which is rotatably attached to the upper ends of the pair of support portions 36 via shafts 37 and receives the outer peripheral surface of the shaft 4, and is inserted through the pair of support portions 36. It comprises a bolt 39 and a pair of nuts 40 screwed to both ends of the bolt 39.
The support portion adjusting means for adjusting the interval between the pair of support portions 36 is constituted by the nut 40 and the nut 40. In the shaft support member 10 configured as described above, by tightening the nut 40, the pair of support portions 36 incline inward with the pin 35 as a fulcrum, and the distance between the pair of receiving portions 38 is reduced, and the abutment on the shaft 4 is reduced. As the position moves downward, the shaft 4 is pushed up. Conversely, when the nut 40 is loosened, the pair of support portions 36 are tilted outward with the pin 35 as a fulcrum, and the distance between the pair of receiving portions 38 is widened and the contact position with respect to the shaft 4 moves upward. Goes down. Thus, the shaft 4 can be vertically centered.

As shown in FIG. 11, the heating device 11 has a control section 41 for detecting the temperature of the boss 2b of the sheave 2 and controlling the heating temperature. The second boss 2b prevents the effect of thermal stress due to a rapid temperature change. This heating device 11
Is designed to heat the boss 2b while being inserted into the hole of the boss 2b of the sheave 2 mounted on the second boss support member 8.

The press-fitting device 12 of the present embodiment is provided with a plurality of leg portions 4 each extending along the axial direction of the shaft 4 and having one end abutting on the end face of the boss 2 b of the sheave 2.
2 and the other ends of the plurality of legs 42 are fixed, and a disk-shaped reaction force receiving plate 43 disposed outside the end surface of the shaft 4.
A center hole type hydraulic ram 44 provided outside the center of the reaction force receiving plate 43, a rod-shaped body 45 inserted into the hydraulic ram 44 and the central through hole 43 a of the reaction force receiving plate 43, A nut 4 screwed into one end of the rod 45
6, a contact plate 48 screwed to the other end of the rod 45 and attached to the end surface of the shaft 4 via a bolt 47, and a hydraulic source 50 for supplying hydraulic oil to the hydraulic ram 44 via a hydraulic hose 49. It consists of

As shown in FIG. 29, each of the hydraulic rams 44 includes a cylinder 52 having a center hole 51 into which a rod 45 is inserted, and a plunger 53 provided to be able to enter and exit the cylinder 52. A lubrication unit 54 provided at one end of the cylinder 52 and connected to a hydraulic hose 49
It consists of In this hydraulic ram 44, a hydraulic source 50
Oil discharged from the oil supply unit 5 via a hydraulic hose 49
When the pressure oil flows into the cylinder 52 from the position 4, the oil amount in the cylinder 52 increases in accordance with the flow amount of the pressure oil, and the plunger 53 is pushed to the left in FIG. Along with this,
The nut 46 is pressed to the left in FIG.
As a result, the rod-shaped body 45 screwed with the drive is driven, so that a pressing force is applied to the sheave 2 via the leg 42.

In this embodiment, when the sheave is replaced, the sheave 2 is pulled out by the following series of procedures (1) to (1).
This is performed in (8). That is, first, as a procedure (1), the brake 6 is removed from one end of the existing sheave 2 shown in FIG. 1, and then, as shown in FIG.
The first boss support member 7 is placed on the top, and the sheave 2 is supported by the first boss support member 7. As a procedure (2), as shown in FIG. When the shaft 4 is removed from one end, the sheave 2 is received by the first boss support member 7 instead of the bearing 5a, and the other end of the shaft 4 is received by the remaining bearing 5b. Support in the out state. As a procedure (3), as shown in FIG. 4, a second boss support member 8 is provided on the base 1 using a bolt hole (not shown) for mounting the bearing 5a on the base 1, and the guide rail 3 is provided. Is received by the floor 1a via the support seat 14, and each tapered surface 16a of the pair of receiving stands 16 is brought into contact with the outer peripheral surface of the sheave 2, and then the first boss support member 7 is placed on the base 1. Remove from As a result, as shown in FIG. 5, the shaft 4 to which the sheave 2 is attached is connected to the second boss support member 8 and the bearing 5.
b, the initial centered state,
That is, it is supported similarly to the state shown in FIG.

Next, as a procedure (4), FIG. 6 and FIG.
2, the pulling device 9 is mounted on one end of the sheave 2. When assembling the drawing device 9, a plurality of hydraulic rams 22 are attached to the reaction force receiving plate 21 in advance, and a portal type lifting device (not shown) that can be easily assembled on site.
The above-mentioned reaction force receiving plate 21 is lifted by using the above-mentioned method, and the central portion of the reaction force receiving plate 21 is brought into contact with one end of the shaft 4. The reaction force receiving plate 21 is attached to one end of the shaft 4 via a bolt (not shown) using a screw hole (not shown) used in a manufacturing process or the like in a state facing the shaft 2c. Thereafter, the six rods 23 are respectively inserted from the distal ends of the hydraulic rams 22 and inserted into the through holes 20 of the reaction force receiving plate 21 and the cast holes 2 c of the sheave 2, and the gap between the sheave 2 and the prime mover 3 is formed. The pressurizing body 26 is inserted by using
6 is inserted into the rod 23, nuts 24 and 25 are screwed to both ends of the rod 23, and the nuts 24 and 25 are tightened to support the rod 23 in a tensioned state. At the time of assembling the pulling-out device 9, it is easy to mount the rod 23 on the upper side, so after attaching one rod 23 on the upper side, the shaft 4 is rotated by a predetermined angle to remove the next rod 23. By repeatedly performing mounting, such mounting and rotation, all the rod-like bodies 23 can be quickly mounted. In the operation of extracting the sheave 2, it is preferable that the hydraulic ram 22 is attached to the reaction force receiving plate 21 in consideration of the efficiency of the on-site operation. As described above, the state where the hydraulic ram 22 is attached is maintained.

After assembling the drawing device 9 in this manner, when the hydraulic source 29 of the drawing device 9 is started in step (5), the hydraulic pressure from the hydraulic source 29 via the distributor 27 and the hydraulic hose 28 Since the pressure oil is supplied to the ram 22, the hydraulic ram 2 is supplied as shown in FIGS.
2 are extended, and the sheave 2 is pulled in the direction of the pull-out device 9 (that is, the left side in FIG. 7) via the rod-shaped body 23 and the pressing body 25, so that the sheave 2 is
Starts to come off from the shaft 4 along. Then sheave 2
Has moved a predetermined distance, ie, the sheave 2 and the prime mover 3
When the distance between and reaches a predetermined dimension, as a procedure (6),
The hydraulic source 29 is stopped, and the base plate 34 of the shaft support member 10 is mounted on the base 1 as shown in FIG. 25, and the disk is rotatably mounted on the upper ends of the pair of support portions 36. The outer peripheral surface of the shaft 4 is received from below by the receiving portion 38 having a shape of a circle.

After the one end of the shaft 4 is supported by the shaft supporting member 10 as described above, when the hydraulic power source 29 is started again in step (7), the hydraulic ram 22 further extends and the sheave 2 is pulled out. Is resumed, sheave 2
Is detached from the shaft 4. After that, by reading the pressure with a pressure gauge (not shown) provided in the distributor 27 and the like,
After confirming that the sheave 2 has completely come off from the shaft 4, the hydraulic ram 22 is returned to the original state by operating the hydraulic source 29 in the reverse direction, and the rod 23
And the pressure body 24 are removed from the sheave 2 and the hydraulic ram 22
After the reaction force receiving plate 21 is detached from the shaft 4 in the state where is attached, the sheave 2 is moved to the end of the guide rail 3 of the second boss support member 8 as shown in FIG. For example, the sheave 2 is lowered from the guide rail 3 using a portal hoist (not shown) which can be easily assembled on site.

When the existing sheave 2 is extracted as described above, the sheave 2 is detached from the shaft 4 and lowered from the guide rail 13 at the stage where the shaft 4 is removed.
Is supported by the bearing 5b and the shaft support member 10, so that the initial centered state should normally be maintained. However, the center is shifted to the shaft 4, and at this time, If any error occurs, the accumulation will be accumulated at this stage, which may hinder the operation of attaching the next newly installed sheave 2 to the shaft 4.
Preparations for mounting the new sheave 2 are prepared according to the following procedures (9) to (11).

That is, as a procedure (9), the horizontality of the shaft 4 and the parallelism between the shaft 4 and the second boss support member 8 are measured using a level or a dial gauge (not shown) in the state shown in FIG. When it is necessary to adjust these horizontality and parallelism, the shaft support member 10 is adjusted to center the shaft 4, and then the second The centering of the boss support member 8 is confirmed. As procedure (10), a new sheave 2
Is placed on the receiving table 16 of the second boss support member 8, and the newly provided sheave 2 is moved to near the end face of the shaft 4 as shown in FIG. Next, the expansion amount when the newly provided sheave 2 is subjected to the heat treatment is assumed, and the inner diameter and the outer diameter of the cylindrical shape of the sheave 2 with respect to the heating temperature can be calculated by taking into account the expansion amount. ), The center of the newly provided sheave 2 and the shaft 4 is determined correspondingly, and the shaft support member 10 and the second boss support member 8 are adjusted to adjust the positions. At this time, the shaft 4
If a dial indicator (not shown) is mounted on the shaft of the end surface of the shaft and the above operation is performed while rotating the shaft 4, the centering operation can be performed easily and accurately.

After completing the preparatory work in accordance with the above procedures (9) to (11), the work of mounting the new sheave 2 is performed in the following series of procedures (12) to (20). I have. That is, as a procedure (12), as shown in FIG. 11, the heating device 11 is attached to one end of the newly provided sheave 2 centered by the second boss support member 8, and the heating device 11 is omitted from the drawing, but the boss 2b is not shown. With the heating portion of the heating device 11 inserted into the hole, the boss 2 b is heated by the heating device 11 to cause thermal expansion of the boss 2 b, so that the inner diameter of the boss is larger than the outer diameter of the end of the shaft 4. At this time, the temperature of the boss 2b of the new sheave 2 is measured and the control unit 4
By controlling the heating temperature of the heating device 11 in step 1, the boss 2b is prevented from being subjected to thermal stress due to a rapid temperature change. Generally, when a sheave is shrink-fitted, it slightly varies depending on the boss hole diameter of the sheave.
The temperature is heated to C.

Next, as a procedure (13), after removing the heating device 11 from the heated sheave 2, as shown in FIG. 12, the sheave 2 is moved rightward in FIG. After inserting one end of sheave 4, sheave 2
The press-fitting device 12 is attached to one end of the device. This press-fitting device 12
When assembling, the reaction force receiving plate 43 is opposed to the end face of the sheave 2, and a plurality of legs 42 are respectively brought into contact with the end face of the sheave 2, so that the rod 45 is connected to the hydraulic ram 44 and the reaction force. The rod is inserted into the central through hole 43 a of the receiving plate 43, and the contact plate 48 provided at the end of the rod 42 is attached to the end surface of the shaft 4 via the bolt 47. In the operation of press-fitting the sheave 2, it is preferable that the hydraulic ram 44 be attached to the reaction force receiving plate 43 in consideration of the efficiency of on-site work. As described above, the state where the hydraulic ram 44 is attached is maintained.

Next, as the procedure (14), the press-fitting device 12
When the hydraulic source 50 is started, the hydraulic oil is supplied from the hydraulic source 50 to the hydraulic ram 44 via the hydraulic hose 49, so that the hydraulic ram 44 extends as shown in FIG. The shaft 4 is connected to the press-fitting device 1 via the contact plate 48.
2 (that is, the left side in FIG. 13). As a result, a pressing force in the direction of the prime mover 3 (that is, the right side in FIG. 13) is applied to the sheave 2 via the reaction force receiving plate 43 and the leg 42, so that the shaft 4 is attached to the boss 2b of the sheave 2.
Begins to fit.

At this time, since the newly provided sheave 2 is mounted on the shaft 4, the shaft 4 is also supported by the second boss support member 8, so that the shaft support member 10 becomes unnecessary. In addition, when the newly provided sheave 2 is completely mounted, the distance between the sheave 2 and the prime mover 3 becomes narrower, so it is necessary to remove the shaft support member 10 in advance.
Therefore, as a procedure (15), the press-fitting device 12 is stopped during the process of fitting the shaft 4 into the boss 2b of the sheave 2, and as shown in FIG. After removing from above, the press-fitting device 12 was operated again as a procedure (16), and the shaft 4 was fitted to a predetermined position of the sheave 2 as shown in FIG. By reading the pressure with a pressure gauge (not shown), it is confirmed that the shaft 4 has been completely fitted. At this time, if there is a slight gap in the fitting state between the newly-installed sheave 2 and the shaft 4, there is a concern that the gap may cause misalignment.
Until the pressure drops to a predetermined temperature, for example, 60 ° C., by the press-fitting device 12. In this type of work, forced cooling is performed by using a blower (not shown).
It often drops to 60 degrees C in about a minute.

Next, in step (17), the hydraulic power source 50
Is operated in the reverse direction to return the hydraulic ram 44 to the original state, the leg 42 is detached from the end face of the sheave 2, and the contact plate 48 is removed from the end face of the shaft 4, as shown in FIG. As described above, the press-fitting device 12 is
As shown in FIG. 17, as shown in FIG. 17, the first boss support member 7 is mounted again on the base 1, and the pair of bosses is rotated by rotating the nut 19 of the second boss support member 8. By moving the guide rails 13 in the direction in which the width of the guide rails 13 increases, the pair of receiving bases 16 are separated from the outer peripheral surface of the sheave 2, respectively.
Then, the second support member 8 for the boss is removed as shown in FIG. as a result,
When the sheave 2 is received by the first boss support member 7, the shaft 4 on which the sheave 2 is mounted is supported in a centered state.

Next, as a procedure (19), as shown in FIG. 19, the bearing 5a is mounted on the base 1 again, and one end of the shaft 4 is mounted on the bearing 5a by a press-fitting device (not shown). 20), as shown in FIG. 20, the first boss support member 7 is removed from the base 1 and the newly provided sheave 2 is rotated to check the gap between the rotor (not shown) of the motor 3 and the stator. After confirming that there is no abnormal sound from the shaft 4 etc.
As a procedure (21), the brake 6 is attached to the bearing 5a again as shown in FIG.

In the embodiment configured as described above, when the newly installed boss 2b subjected to the heat treatment is press-fitted into the shaft 4, the hydraulic ram 44 drives the rod to the end of the shaft 4 via the rod 45 and the contact plate 48. When the boss 2b of the sheave 2 is pulled out from one end by the reaction force, the press-fitting operation of the boss 2b of the sheave 2 can be performed smoothly using hydraulic pressure. When the boss 2b of the sheave 2 comes into contact with the stepped portion of the shaft 4 to generate an impact force, the reaction force is applied only in the axial direction via the rod 45 and the contact plate 48. Can be prevented from being displaced in directions other than the axis direction. As a result, the above-described impact force propagates to the bearing 5b via the shaft 4, but the shaft 4 does not need to be displaced in a direction other than the axial direction, that is, a displacement occurs between the shaft 4 and the bearing 5b. This bearing 5
b can be prevented from being damaged.

Further, in this embodiment, when the newly provided boss 2b is press-fitted, the newly provided boss 2b is centered and supported by the second boss support member 8, so that the newly provided boss 2b is centered. , The new boss 2b can be smoothly pressed in from this point as well. Further, a state in which the centering is slightly out of order when the newly-installed boss 2b subjected to the heat treatment is press-fitted, and a so-called locked state can be avoided,
It is not necessary to repeat the heating process of the newly-installed boss 2b, and it is not necessary to put a large burden on the operator for press-fitting the newly-installed boss 2b, and the working efficiency can be improved from this point as well.

In this embodiment, when one of the bearings 5a is detached from one end of the shaft 4, this one bearing 5a
Instead, after the sheave 2 is supported by the first boss support member 7, the sheave 2 is centered and supported by the second boss support member 8, and the shaft 4 is supported by the shaft support member 10. By supporting the sheave 2 and the shaft 4, the sheave 2 and the shaft 4 can be maintained in the initial centered state without causing misalignment. Further, in this state, the existing boss 2b can be smoothly pulled out from one end side of the shaft 4 using the hydraulic pressure by the pulling-out device 9.

Further, in the present embodiment, it is not necessary to use a special part configuration as a safety measure for removing and press-fitting the boss 2b unlike the conventional case, so that it is not necessary to increase the manufacturing cost of the gearless hoist. At the same time, since a large crane is not particularly required for removing and press-fitting the boss 2b, the cost of remodeling an elevator machine room and the like due to the installation of the large crane is not required, and the economy is excellent.

In the present embodiment, when the sheave 2 is pulled out of the shaft 4 by the pulling-out device 9, when the space between the sheave 2 and the motor 3 reaches a predetermined size, the shaft support member 1 is pulled out.
0, and the shaft 4 is received by the shaft support member 10 and the bearing 5b. Therefore, when the sheave 2 is detached from the shaft 4 as shown in FIG. The state of supporting can be avoided. If the shaft 4 is supported only by the bearing 5b in a cantilever manner, the state where one end of the shaft 4 is lowered and centered with the bearing 5b as a fulcrum cannot be maintained, and an unbalanced load is applied to the bearing 5b. Although there is a concern that the shaft 5b may be damaged, the above-described problem can be prevented by receiving the shaft 4 with the shaft support member 10 and the bearing 5b as described above.

In the present embodiment, 6
Since the two hydraulic rams 22 are provided, the space can be saved in consideration of the space of the elevator machine room in which the drawing device 9 is installed, as compared with the case where one large hydraulic ram is used.

In this embodiment, the shaft 4 can be smoothly fitted into the boss 2b of the sheave 2 by using the hydraulic pressure by the operation of the press-fitting device 12 as described above. According to this, the boss 2b of the sheave 2 can be fitted with a force approximately one twelfth of the force required to pull out the sheave 2.

In this embodiment, the hydraulic ram 22 of the pull-out device 9 and the hydraulic ram 44 of the press-fitting device 12 are of the same center hole type, and the output of the hydraulic ram 44 of the press-fitting device 12 is Since the output of the hydraulic ram 22 can be smaller than that of the hydraulic ram 22,
It can be used for two purposes. As a result, it is not necessary to prepare a dedicated hydraulic ram for the press-fitting device 12, so that the number of parts of the entire device can be reduced and cost can be reduced.

Further, in the present embodiment, a trolley beam is mounted on the ceiling of an elevator machine room, and the shaft 4 is supported and the sheave 2 is transported by a lifting machine movably provided on the trolley beam, as compared with the conventional method. Also,
Since almost no work is carried out by suspending a heavy object such as the shaft 4 or the sheave 2 through a flexible cord such as a wire lobe, there is little danger during this work and the base 1 Since the sheave 2 and the shaft 4 are supported by the support members 7, 8, and 10 fixed above, it is possible to prevent the swing caused by the suspension by the hoist. Thus, when the initial centering state must be maintained, that is, when the movement of the bearing 5b within the allowable range must be maintained, the movement within the allowable range can be reliably maintained. The burden on the worker can be reduced, and a stable working environment can be provided. In addition, since it is not necessary to relocate the air-conditioning duct already mounted on the ceiling of the elevator machine room, it is also economical from this point and the burden on the operator can be reduced, and the period required for the relocation operation is eliminated. , Construction period can be shortened. Therefore, the removal and press-fitting of the boss 2b can be performed safely, accurately, and efficiently even in a narrow elevator machine room.

In general, a new heat-treated sheave 2
When the centering of the shaft 4 and the centering of the shaft 4 have been completely performed, the newly provided sheave 2 is movably mounted on the centering device 8, so that the shaft can be mounted on the boss 2b of the sheave 2 with only human power. 4 can be inserted. However, in practice, the newly provided sheave 2 may not always perform the thermal expansion as calculated due to the surrounding environmental conditions, and a frictional force may be generated between the boss 2b of the sheave 2 and the shaft 4 due to some misalignment. Or a force to push up either the sheave 2 or the shaft 4 may be required.
2, the shaft 4 is fitted into the boss 2b of the sheave 2 using the hydraulic pressure.

[0052]

As described above, according to the present invention,
When the boss is press-fitted, the hydraulic ram can be used to drive the boss smoothly by utilizing the hydraulic pressure, and when the boss abuts the stepped part of the shaft and an impact force is generated, the shaft is not in the axial direction. The bearing does not need to be displaced, that is, there is no displacement between the shaft and the bearing, so that the bearing can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a front view of a gearless hoist in which a boss is replaced using a press-fitting device according to an embodiment of the present invention.

FIG. 2 is a view showing a state in which a brake is removed from the hoist of FIG. 1 and the sheave is supported by a first boss support member.

FIG. 3 is a view showing a state where a bearing is removed from one end of a shaft of the hoist of FIG. 2;

FIG. 4 is a view showing a state in which a second boss support member is provided.

FIG. 5 is a view showing a state in which a first boss support member is removed.

FIG. 6 is a view showing a state in which a sheave pulling-out device is provided.

FIG. 7 is a diagram showing a state in which a shaft support member is provided during the process of pulling out the sheave.

FIG. 8 is a diagram showing a state where a sheave is pulled out.

FIG. 9 is a view showing a state in which the sheave has been removed from above the second boss support member.

FIG. 10 is a diagram showing a state in which centering of a new sheave is checked.

FIG. 11 is a diagram showing a state where a new sheave is subjected to a heat treatment.

FIG. 12 is a view showing a state in which a sheave press-fitting device is provided.

FIG. 13 is a diagram showing a state in the process of press-fitting a new sheave.

FIG. 14 is a view showing a state in which a shaft support member is removed during a press-fitting process of a new sheave.

FIG. 15 is a diagram showing a state in which press-fitting of a new sheave is completed.

FIG. 16 is a diagram showing a state in which the press-fitting device for a sheave is removed after the press-fitting of a new sheave is completed.

FIG. 17 is a view showing a state in which the first boss support member is attached again.

FIG. 18 is a diagram showing a state where a second boss support member is removed.

FIG. 19 is a view showing a state in which a bearing is attached to one end of a shaft again.

FIG. 20 is a view showing a state where a first boss support member is removed.

FIG. 21 is a diagram showing a state in which the brake is mounted again.

FIG. 22 is a diagram illustrating a main part of FIG. 6;

FIG. 23 is a diagram illustrating a main part of FIG. 7;

24 is a sectional view taken along the line AA in FIG.

FIG. 25 is a sectional view taken along the line BB of FIG. 23;

FIG. 26 is a sectional view of a center hole type hydraulic ram provided in the sheave pulling device.

FIG. 27 is a diagram illustrating the main part of FIG. 13;

FIG. 28 is a diagram illustrating a main part of FIG. 14;

FIG. 29 is a sectional view of a center hole type hydraulic ram provided in the sheave press-fitting device.

[Explanation of symbols]

 Reference Signs List 2 sheave 2a brake drum 2b boss 2c cast hole 3 motor 4 shaft (shaft) 5a, 5b bearing 6 brake 7 first boss support member 8 second boss support member 9 pull-out device 10 shaft support member 11 heating Device 12 Press-fitting device 42 Leg 43 Reaction force receiving plate 44 Hydraulic ram 45 Rod 46 Nut 47 Bolt 48 Contact plate 49 Hydraulic hose 50 Hydraulic source

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuji Sekiya 832 Horiguchi, Hitachinaka City, Ibaraki Prefecture 2 Hitachi System Plaza Katsuta Hitachi Mito Engineering Co., Ltd.

Claims (2)

[Claims] After an existing boss fitted to a shaft whose both ends are held by a pair of bearings is pulled out from the shaft, a newly provided boss separately prepared is fitted to the shaft adapted to be pressed into the shaft. In a press-fitting device used in a method of replacing a boss, a plurality of legs each extending along the axis of the shaft and having one end abutting on one end of the boss; The other end is fixed, a reaction force receiving plate disposed outside the end face of the shaft, a center hole type hydraulic ram provided outside the reaction force receiving plate, a hydraulic ram and the reaction force receiving plate. A rod to be inserted, a nut screwed to one end of the rod, and abutting against the tip of the hydraulic ram; and a contact plate screwed to the other end of the rod, and attached to an end face of the shaft. And a hydraulic source for supplying hydraulic oil to the hydraulic ram. Press-fitting apparatus for use in fitting has been replacing the boss to the shaft. 2. The vehicle according to claim 1, wherein the boss is formed integrally with a central portion of a sheave around which an elevator wire rope is wound, and the shaft is a shaft of a motor driving the sheave. A press-fitting device used in the method for exchanging a boss fitted on a shaft according to claim 1.