JP2012041193A - Hoisting machine for elevator and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hoisting machine for elevator, which can be easily assembled by reducing the number of components, can be made compact and light in weight.SOLUTION: Bearings 4, 5 are supported on bearing stands 2, 3 respectively and both end parts of a rotary shaft 6 are freely rotatably supported via the bearings 4, 5. The rotating shaft 6 consists of carbon steel, for example. A main cable winding part 6a around which a main cable 7 is wound is integrally formed on the middle part of the rotating shaft 6. A plurality of rope grooves 6b into which the main cable 7 is inserted are disposed on the main cable winding part 6a. The main cable winding part 6a is forged when manufacturing the rotary shaft 6. The rope grooves 6b can be formed by machining by a lathe or can be formed by forging.

Description

  The present invention relates to an elevator hoisting machine that raises and lowers a car through a main rope.

  In a conventional elevator hoist, a drive sheave, which is a member different from the rotation shaft, is fixed to a rotation shaft rotated by a drive motor. A rope groove is formed in the drive sheave, and a main rope for suspending the car is wound around the drive sheave.

  The drive sheave is required to have a function of rotating smoothly while always receiving a rope load and generating a traction force. For this reason, the drive sheave has sufficient hardness and strength and needs to be processed with high accuracy. Further, in order to transmit a large hoisting torque from the drive motor, the drive sheave is firmly fitted to the rotating shaft by a method such as shrink fitting or using a key. Therefore, the conventional drive sheave is constituted by a thick high-strength casting, which hinders the reduction in the size and weight of the elevator hoist.

  Moreover, when using the main rope which consists of steel ropes, it is requested | required that D / d (driving sheave diameter / main rope diameter) shall be 40 or more from points, such as the softness | flexibility of a steel rope. However, the drive sheave becomes large.

  On the other hand, in recent years, a main rope composed of a synthetic fiber rope has been realized. Since such a synthetic fiber rope has a high coefficient of friction and excellent flexibility, the D / d can be lowered to about 25, and the drive sheave can be downsized.

JP-A-9-142761

  However, in a large-capacity hoist used especially for large elevators, the diameter of the rotating shaft is large, and therefore, when the diameter of the driving sheave is reduced, the difference between the diameter of the driving sheave and the diameter of the rotating shaft is reduced. That is, if the diameter of the drive sheave is minimized, the drive sheave becomes thin, and it becomes difficult to manufacture the drive sheave and fit it into the rotating shaft. For this reason, there is a possibility that the size reduction of the drive sheave and, consequently, the size reduction and weight reduction of the hoisting machine may be restricted in terms of manufacturing and assembly.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an elevator hoisting machine that can be easily assembled by reducing the number of parts and can be reduced in size and weight. Objective.

  An elevator hoisting machine according to the present invention is rotatably supported by a bearing base, a bearing base, a rotary shaft that lifts and lowers a car through a main rope by rotation, a drive motor that rotates the rotary shaft, and rotation of the rotary shaft A brake device for braking is provided, and a main rope winding portion provided with a rope groove into which the main rope is inserted is formed integrally with the rotary shaft.

  The elevator hoisting machine according to the present invention can reduce the number of parts, facilitate assembly, and reduce the size and weight.

1 is a side view showing an elevator hoist according to Embodiment 1 of the present invention. It is a perspective view which shows the structure of the main rope of FIG. It is a side view which shows the winding machine for elevators by Embodiment 2 of this invention. It is a side view which shows the winding machine for elevators by Embodiment 3 of this invention.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a side view showing an elevator hoist according to Embodiment 1 of the present invention. In the drawing, a pair of bearing bases 2 and 3 are fixed on a base 1. Bearings 2 and 3 support bearings 4 and 5, respectively, and both ends of the rotating shaft 6 are rotatably supported via these bearings 4 and 5. The rotating shaft 6 is made of, for example, carbon steel.

  A main rope wrapping portion 6 a around which a main rope 7 suspending a car and a counterweight (both not shown) is wound is integrally formed at an intermediate portion of the rotating shaft 6. The main rope winding portion 6a is provided with a plurality of rope grooves 6b into which the main rope 7 is inserted. The main rope winding portion 6 a is forged when the rotating shaft 6 is manufactured. The rope groove 6b may be formed by lathe processing or may be formed by forging. When the rope groove 6b is formed by forging, the number of manufacturing steps is reduced and no material is wasted.

  The drive motor 8 that rotates the rotating shaft 6 includes a stator 9 fixed on the base 1 and a rotor 10 mounted on an intermediate portion of the rotating shaft 6. The rotating shaft 6 is directly rotated by a drive motor 8 without a gear.

  The brake device 11 that brakes the rotation of the rotary shaft 6 includes a brake disk 12 that rotates integrally with the rotary shaft 6, and a brake device body 13 that brakes the rotation of the brake disc 12. The diameter of the portion adjacent to the main rope winding portion 6a of the rotary shaft 6 is smaller than the diameter of the main rope winding portion 6a, and the brake disk 12 is formed on the end surface of the main rope winding portion 6a in the axial direction. It is joined and fixed to the rotating shaft 6. The brake disc 12 is fixed to the rotary shaft 6 by a plurality of bolts 14 extending in parallel to the axial direction of the rotary shaft 6 and screwed to the end face of the main rope winding portion 6a.

  Next, FIG. 2 is a perspective view showing the structure of the main rope 7 of FIG. In the figure, an inner strand layer 24 having a plurality of inner strands 22 and filled strands 23 arranged in a gap between these inner strands 22 is arranged around the core wire 21. Each inner strand 22 is composed of a plurality of aramid fibers and an impregnating material such as polyurethane. The filling strand 23 is made of polyamide, for example.

  An outer strand layer 26 having a plurality of outer strands 25 is disposed on the outer periphery of the inner strand layer 24. Each outer strand 25 is composed of a plurality of aramid fibers and an impregnating material such as polyurethane, like the inner strand 22.

  Between the inner strand layer 24 and the outer strand layer 26, a friction reducing coating layer 27 is disposed to avoid wear of the strands 22 and 25 due to friction between the strands 22 and 25. A protective coating layer 28 is disposed on the outer periphery of the outer strand layer 26.

  Such a synthetic fiber rope has a high coefficient of friction and excellent flexibility compared to a steel rope.

  In the elevator hoist configured as described above, the main rope winding portion 6a is formed integrally with the rotary shaft 6 without using a separate drive sheave, so that the number of parts can be reduced. In addition, shrink fitting and key processing are not required, and assembly can be facilitated. Moreover, the diameter of the main rope winding part 6a can be minimized and the overall size and weight can be reduced.

  Such an elevator hoisting machine can be used for a main rope made of a steel rope as long as the diameter of the main rope winding portion 6a is sufficiently secured. It is effective to use the main rope 7 made of a synthetic fiber rope.

  Moreover, since the main rope winding part 6a is comprised with the material similar to the rotating shaft 6, if a steel rope is used, the rope groove 6b will be easy to wear. On the other hand, in the case of a synthetic fiber rope, the rope groove 6b is not easily worn. Furthermore, since the synthetic fiber rope has a high coefficient of friction, it is not necessary to provide an undercut groove in the rope groove 6b for increasing the frictional force. It is effective to use.

  Moreover, since the brake disc 12 can be attached using the end surface of the main rope winding part 6a integral with the rotating shaft 6, the brake disc 12 can be fixed to the rotating shaft 6 easily and firmly.

Embodiment 2. FIG.
Next, FIG. 3 is a side view showing an elevator hoist according to Embodiment 2 of the present invention. In the figure, a bearing base 32 is fixed on a base 31. A bearing 33 is supported on the bearing base 32, and an intermediate portion of the rotating shaft 34 is rotatably supported via the bearing 33. The rotating shaft 34 is made of, for example, carbon steel.

  A main rope winding portion 34 a around which the main rope 7 is wound is integrally formed at one end portion of the rotating shaft 34. The main rope winding portion 34a is provided with a plurality of rope grooves 34b into which the main rope 7 is inserted.

  The drive motor 35 that rotates the rotating shaft 34 includes a case 36 fixed to the bearing base 32, a stator 37 fixed in the case 36, and a rotor 38 mounted on the rotating shaft 34. Yes. The rotating shaft 34 is directly rotated by a drive motor 35 without a gear. In this example, a drive motor 35 of a type using a permanent magnet for the rotor 38 is used. The case 36 holds a bearing 39 that rotatably supports the other end of the rotating shaft 34.

  The brake device 11 that brakes the rotation of the rotation shaft 34 includes a brake disk 12 that rotates integrally with the rotation shaft 34, and a brake device body 13 that brakes the rotation of the brake disk 12. The brake disk 12 is joined to the axial end surface of the main rope winding portion 6 a and fixed to the rotary shaft 34. The brake disk 12 is fixed to the rotary shaft 34 by a plurality of bolts 14 extending in parallel to the axial direction of the rotary shaft 34 and screwed to the end surface of the main rope winding portion 34a.

  As described above, the main rope winding portion 34a may be formed at one end portion of the rotating shaft 34. When the number of the rope grooves 34b is small, the whole can be effectively downsized.

Embodiment 3 FIG.
Next, FIG. 4 is a side view showing an elevator hoist according to Embodiment 3 of the present invention. In the figure, a pair of bearing bases 42 and 43 are fixed on a base 41. Bearings 42 and 43 support bearings 44 and 45, respectively, and a rotating shaft 46 is rotatably supported via these bearings 44 and 45. The rotating shaft 46 is made of, for example, carbon steel.

  A main rope winding portion 46a around which the main rope 7 is wound is formed integrally with the rotary shaft 46. A plurality of rope grooves 46b into which the main rope 7 is inserted are provided in the main rope winding part 46a.

  A drive motor 47 that rotates the rotating shaft 46 includes a case 48 fixed to the bearing base 42, a stator 49 fixed in the case 48, and a rotor 50 mounted on the end of the rotating shaft 46. Have. The rotating shaft 46 is directly rotated by a drive motor 47 without a gear. In this example, a drive motor 47 using a permanent magnet for the rotor 50 is used.

  The brake device 11 that brakes the rotation of the rotation shaft 46 includes a brake disk 12 that rotates together with the rotation shaft 46, and a brake device body 13 that brakes the rotation of the brake disk 12. The diameter of the portion adjacent to the main rope winding portion 46a of the rotary shaft 46 is smaller than the diameter of the main rope winding portion 46a, and the brake disc 12 is formed on the end surface in the axial direction of the main rope winding portion 46a. It is joined and fixed to the rotating shaft 46. The brake disk 12 is fixed to the rotary shaft 46 by a plurality of bolts 14 extending in parallel to the axial direction of the rotary shaft 46 and screwed to the end face of the main rope winding portion 46a.

  In such an elevator hoisting machine, the drive motor 47 is disposed overhanging outside the pair of bearing bases 42 and 43. Therefore, it is suitable when a relatively small drive motor 47 is used, and the overall size can be further reduced, for example, the base 41 can be made smaller.

  In the first to third embodiments, the gearless type hoisting machine has been described. However, the present invention can also be applied to a geared type hoisting machine that transmits the driving force of the drive motor to the rotating shaft via a speed reduction mechanism. .

  2, 3 Bearing base, 6, 34, 46 Rotating shaft, 6a, 34a, 46a Main rope winding part, 6b, 34b, 46b Rope groove, 7 Main rope, 8, 35, 47 Drive motor 10, 38, 50 Rotor, 11 brake device, 12 brake disc, 13 brake device body, 14 bolts.

The present invention has been made in order to solve the above-described problems. An elevator hoisting machine capable of facilitating assembly by reducing the number of parts and reducing the size and weight, and a method of manufacturing the same. The purpose is to obtain.

A method for manufacturing an elevator hoist according to the present invention includes a bearing base, a rotary shaft that is rotatably supported by the bearing base via a bearing, and that rotates the car up and down via the main rope by rotation, and a drive motor that rotates the rotating shaft And a brake device that brakes the rotation of the rotation shaft. The rotation shaft is equipped with a rotor of a drive motor, and the rotation shaft is directly driven by the drive motor, and a rope groove into which the main rope is inserted is provided. The main rope winding part is a manufacturing method of the one provided on the rotating shaft, and the main rope winding part is integrally formed on the rotating shaft by forging or lathe processing without using a separate drive sheave. In addition, the diameter of the main rope winding portion is set to be equal to or smaller than the outer diameter of the bearing .

The elevator hoisting machine and the manufacturing method thereof according to the present invention can reduce the number of parts, facilitate assembly, and reduce the size and weight.

Claims (8)

Bearing stand,
A rotating shaft that is rotatably supported by the above-mentioned bearing base, and lifts and lowers the car through the main rope by rotation;
An elevator hoisting machine comprising: a drive motor that rotates the rotating shaft; and a brake device that brakes the rotation of the rotating shaft.
An elevator hoisting machine in which a main rope winding portion provided with a rope groove into which the main rope is inserted is formed integrally with the rotary shaft.   The brake device includes a brake disk that is rotated integrally with the rotary shaft, and a brake device body that brakes rotation of the brake disc, and a portion adjacent to the main rope winding portion of the rotary shaft. 2. The diameter of the main rope winding portion is smaller than the diameter of the main rope winding portion, and the brake disk is joined to the axial end surface of the main rope winding portion and fixed to the rotary shaft. The elevator hoisting machine described.   The elevator hoist according to claim 2, wherein the brake disk is fixed to the rotary shaft by a plurality of bolts extending parallel to the axial direction of the rotary shaft and screwed to an end surface of the main rope winding portion. Machine.   The elevator hoisting machine according to claim 1, wherein a rotor of the drive motor is mounted on the rotary shaft, and the rotary shaft is directly driven by the drive motor.   The elevator hoist according to claim 4, wherein both ends of the rotating shaft are supported by the bearing base, the rotor is mounted on an intermediate portion of the rotating shaft, and the main rope winding portion is formed. Machine.   An intermediate portion of the rotary shaft is supported by the bearing base, the main rope winding portion is formed at one end of the rotary shaft, and the main rope winding portion is opposite to the bearing base of the rotary shaft. The elevator hoist according to claim 4, wherein the rotor is mounted on a side.   One end portion and an intermediate portion of the rotating shaft are supported by the bearing base, the main rope winding portion is formed in the intermediate portion of the rotating shaft, and the rotor is mounted on the other end portion of the rotating shaft. The elevator hoist according to claim 4.   The elevator hoist according to claim 1, wherein the rope groove is formed by forging.

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