JPH11171421A - Heating method for sheave and brake drum of elevator hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating method for a sheave and brake drum of an elevator hoist that heats up a sheave and brake drum of a gearless hoist evenly and efficiently without affecting them adversely even within a small elevator machine room with no provision of an electric furnace as used in a factory. SOLUTION: A sheave 5 and a brake drum 6 is heated up through the provision of a heater 18 in the lower-half circumferential section of a boss hole 17 and of a thermally conductive metallic thin plate over the circumferential face of the boss hole 17 and through the closure of both the end openings of the boss hole 17 with a heater mount 19 and a lid 21 such that the boss hole 17 internally has a hermetic space. This constitution realizes a small-sized heating device that prevents its heating wires from affecting such members adversely and bears matched with a large-sized electric furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoist for an elevator, and more particularly, to a case where a sheave and a brake drum of a gearless hoist without a speed reducer are mounted on a rotor shaft in a building in which the hoist is installed. A method for heating a sheave and a brake drum.

[0002]

2. Description of the Related Art As for the structure of a gearless hoist for an elevator, an electric motor is generally installed on a base, and a hoisting sheave and a brake drum are mounted on an extension of one end of a rotor shaft of the electric motor. A motor in which both ends of an electric motor are respectively supported by two bearing devices is known (Japanese Patent Laid-Open No. 50-306, Japanese Utility Model Application Laid-Open No. 61-1015).
No. 77, and Japanese Utility Model Application Laid-Open No. Sho 62-179281).

[0003] The basic assembly of a gearless hoist having the above structure is, especially when a sheave and a brake drum are mounted on the rotor shaft, in a factory, the rotor shaft is vertically extended so that the extension is upward. When the sheave and the brake drum are heated in an electric furnace and the temperature of the shaft hole diameter of the sheave and the brake drum is sufficiently widened from the diameter of the fitting part of the rotor shaft, an electric The sheave and the brake drum were taken out of the furnace and mounted by their own weight while being lowered vertically along the rotor axis.

[0004]

By the way, when an elevator using this kind of gearless hoist is installed, it is a high-rise building, many of which are high-speed, and the car is large in order to increase the transportation capacity. It is a shape, and the main rope diameter becomes thicker with it. In the case of elevators, the sheave diameter is regulated by the Building Standards Law to be at least 40 times the main rope, and the diameter of the main rope used in this type of gearless hoist is often 18 mm, and The number is eight
The number of main ropes is double, and the number of main ropes is twice the number of main ropes because a full wrap method is adopted in which the main ropes are wound twice around the sheave to increase the surface pressure between the main ropes and the sheave. . Further, the sheave and the brake drum are generally formed as a single piece.
00 mm and a width of about 600 mm.

If the sheave groove is worn over time after installing this kind of gearless winder, it is necessary to replace the sheave with a new one when a certain amount of wear is reached for safety. At this time, the old sheave and brake drum are pulled out from the rotor shaft, and a new sheave and brake drum are attached to the rotor shaft.
In this operation, equipment is required to perform the method described in the prior art.

However, in the elevator machine room, besides this kind of gearless hoisting machine, control panels for individually controlling them are arranged in a small space, so that it is not possible to secure a place for installing the prior art equipment. Is the actual situation.

[0007] Therefore, the inventor has devised a device in which a heating part is inserted into a boss hole of a sheave and a brake drum, and both ends of the boss hole are closed with lids as a method of heating the same as an electric furnace even in a narrow elevator machine room. did.

However, as a result of an experiment using this apparatus, it was possible to perform the same heating as in the case of heating in an electric furnace, but there was a trace of burning in the heated portion.
When the hardness was measured, the hardness was slightly increased.

An object of the present invention is to provide a sheave and a brake drum for an elevator hoisting machine which can prevent a quenching phenomenon occurring in a portion where the sheave and the brake drum are heated without lowering the heating efficiency when heating the sheave and the brake drum. To provide a heating method.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a base, an electric motor removably provided on the base, and an extension lamp formed by extending one end of a rotor shaft of the electric motor. An elevator hoist including a hoisting sheave and a brake drum mounted on a rotor, wherein when the sheave and the brake drum are mounted on an extension of the rotor shaft, the sheave and the brake are determined from the rotor shaft diameter. In a method for heating a sheave and a brake drum of an elevator hoist that heats the sheave and the brake drum so that the diameter of the boss hole of the drum is widened, a heating portion is formed on a semicircle along the boss hole of the sheave and the brake drum. The sheave and the heating device formed by a heater supported by a support to be arranged and a lid connected to the heater and closing the boss hole. When heating the Rekidoramu, in which a structure is heated by interposing an excellent sheet metal heat conduction between the sheave and the brake drum and the heating unit.

According to the solution of the present invention, since the heated surfaces of the sheave and the brake drum do not directly receive the heat rays radiated from the heat generating portion, the adverse effects of the heat rays on the surfaces are reduced. In addition, the efficiency of conducting the heat generated from the heat generating portion to the sheave and the brake drum is not extremely reduced, so that the heating operation is not hindered.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a state in which a hoisting sheave and a brake drum of an elevator gearless hoist according to an embodiment of the present invention are heated. FIG. 1 is a perspective view showing the internal cross-sectional state of the winding machine and the heating device, and FIG.
It is sectional drawing seen from -A.

As shown in FIG. 1, a gearless hoist of this embodiment comprises a base 1 and a bolt 2 mounted on the base 1.
Motor 3 which is detachably installed by means of
Hoisting sheave 5 and brake drum 6 attached to an extension 4a formed by extending one end of rotor shaft 4
And a pair of bearing devices 8 (the other is not shown) for supporting the rotor shaft 4.
In the present invention, the sheave 5 and the brake drum 6 are mounted by using bolts 9 and 10, respectively, using screw holes for mounting the other bearing device and screw holes for a support base for mounting a brake arm (not shown) for holding the brake drum 6. Of a sheave 5 and a brake drum 6 comprising a base 13 to which a guide portion 12 adapted to freely move the support 11 along the rotor shaft 4 is provided. Guide device 14 is base 1
Mounted on top of. On the base 13, a pair of rotor shaft support devices 16 (the other is not shown) having a contact portion 15 that is in contact with the rotor shaft 4 and that allows the rotor shaft 4 to rotate. The rotor support device 16 is detachably mounted by bolts (not shown).

The sheave 5 and the brake drum 6 are provided with a boss hole 17 to be fitted to the extension 4a.
The heater 18 is inserted into the boss hole 17 and a heater 18 is provided along the semicircle of the peripheral surface of the boss hole 17 so as to be below the boss hole 17 as shown in FIG. A heater mounting base 19 formed in a lid shape so as to close one of the boss holes 17, and a lid 21 mounted by a rod 20 mounted on the heater mounting base 19 and closing the other boss hole 17. This is a heating device composed of:

The heaters 18 are arranged along the lower semicircle of the boss hole 17, and the heater mounting base 19 formed as a lid for closing the openings at both ends of the boss hole 17, and the lid 21 is connected by a rod 20. When the heater 18 is energized so that the boss hole 17 is attached and the middle part of the boss hole 17 is sealed by these 19 and 21, the heater 18 generates heat and radiant heat is generated therefrom. The lower semicircular surface of the boss hole 17 is heated by the strong radiant heat generated from the heater 18 because the distance from the heater 18 is short, while the upper semicircular surface is long from the heater 18 because the distance from the heater 18 is long. The emitted radiant heat is diffused and weakened, and the effect of the heater 18 is not so large as compared to the lower semicircular surface, and the temperature for heating the sheave 5 and the brake drum 6 is not high. Therefore, the upper semicircular surface cannot be heated at a high temperature by itself. However, since the inside of the boss hole 17 is a closed space by the heater mounting base 19 and the lid 21, the air in the boss hole 17 is heated by the heater 18, and the heated air is heated by the convection phenomenon of heat. Ascending to the upper semicircle of the boss hole 17, the upper semicircular surface is heated.
Therefore, when the inventor conducted experiments and confirmed that the heaters 18 were arranged in this manner, and the sheaves and the brake drum as described in the prior art were heated so as to cover both ends of the boss holes 17, the boss holes were heated. As a result, it is possible to uniformly heat the periphery of the boss 17 and to a temperature at which the boss hole 17 can reach a temperature at which the necessary expansion is obtained.

At this time, as shown in FIG.
When a thin metal plate 23 having excellent heat conductivity is arranged on the circumferential surface of the boss hole 17, the heat rays emitted from the heater 18 can be cut off by the thin metal plate 23, and the sheave 5 and the brake drum 6 The surface of the boss hole 17 is not irradiated, so that it is possible to prevent the surface from being quenched, and it is possible to prevent the material of the sheave 5 and the brake drum 6 from being deteriorated by a strong heat ray. There is.

As described above, in the present embodiment, when the sheave and the brake drum of the gearless hoist are mounted on the rotor shaft, the operation of expanding the boss hole from the rotor shaft diameter is performed. Use a heater that is arranged along the lower semicircular surface of the boss hole, place it in the boss hole, and place a thin metal plate with excellent heat conduction on the peripheral surface of the boss hole. The openings at both ends of the boss hole are closed with lids so that the inside of the boss hole is heated so that the inside of the boss hole becomes a closed space. By being heated by the three types of heat of the convection phenomenon, the sheave and the periphery of the boss hole of the brake drum can be heated as effectively as the electric furnace described in the related art, and the heated member can be directly heated. Since it does not radiate heat rays, it is possible to realize a sheave and brake drum heating device of a small gearless hoist whose members can prevent the material from being deteriorated by radiant heat, and thereby can be installed in a building. Later, when the sheaves and brake drums needed to be replaced, they could easily do so in a narrow elevator machine room on site.

[0019]

As described above, according to the present invention,
To heat the sheave and brake drum of the gearless winder, a heater is arranged along the lower semicircular surface of the boss hole of the sheave and brake drum, and a thin metal sheet with excellent heat conduction is provided on the boss hole peripheral surface. And the openings at both ends of the boss hole are closed with lids, and the center of the boss hole is heated as a closed space, so that the sheave and brake drum can be heated in a short distance, a long distance and a heat convection phenomenon. Since the heating method utilizes the heating method, it is possible to provide a small-sized heating device capable of heating the same as an electric furnace.

[Brief description of the drawings]

FIG. 1 is an internal cross-sectional perspective view showing a state in which a hoisting sheave and a brake drum of an elevator gearless hoist of one embodiment of the present invention are heated.

FIG. 2 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 3 Electric motor 4 Rotor shaft 5 Hoisting sheave 6 Brake drum 8 Bearing device 14 Guide device 17 Boss hole 18 Heater 19 Heater mount 20 Rod 21 Lid 22 Heating device 23 Metal thin plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masamitsu Yakimaki 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo In the Hitachi Building Systems Co., Ltd. (72) Inventor Isao Yoshida 832 Horiguchi 832 Horiguchi, Hitachinaka City, Ibaraki Prefecture Plaza Katsuta Hitachi Mito Engineering Co., Ltd.

Claims (1)

[Claims] 1. A motor comprising: a base; an electric motor detachably mounted on the base; and a hoisting sheave and a brake drum mounted on an extension lamp extending one end of a rotor shaft of the electric motor. In the elevator hoist,
When the sheave and the brake drum are mounted on an extension of the rotor shaft, an elevator hoist for heating the sheave and the brake drum so that the boss hole diameter of the sheave and the brake drum is larger than the rotor shaft diameter. In the method for heating a sheave and a brake drum, a heater supported on a support member that arranges a heat generating portion on a semicircle along a boss hole of the sheave and the brake drum; and a boss hole connected to the heater. When heating the sheave and the brake drum by a heating device formed by a closing lid, the heating is performed by interposing a thin metal plate having excellent heat conduction between the sheave and the brake drum and the heat generating portion. For heating elevator sheaves and brake drums.