JPH047284A - Speed adjusting device for elevator - Google Patents

Abstract

PURPOSE:To maintain good location accuracy of the place where an elevator cage stops for a longer period of time by putting titanium carbide as covering over a groove formed at the periphery of the sheave body of a speed governor, and thereby minimizing wear of the sheave. CONSTITUTION:When a sheave 10 of a speed governor 7 rotates through a rope 12 associate with rise and fall of an elevator cage 5, the location sensing rotary shaft 22 of the sensor unit 21 of this location sensing device concerned 14 moves interlockingly, and a slit disc rotates in synchronization with the sheave 10, and the sensor generates pulses depending upon whether slit exists. Digital signals according to these pulses are calculated, and the cage location relative to the specified position in the elevator pit is sensed. A rope groove 41a provided at the periphery of the sheave body is coated with titanium carbide (TiC) or hard chrome plating through electric plating process followed by application of TiC coating thereover, and thereby wear of the sheave due to its slip with the rope is eliminated. Thus cage position sensing can be made accurately for long period.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an elevator speed governor.

(Prior Art) Generally, a hoisting type elevator has a hoisting machine installed in the upper machine room of the hoistway, and a car and a counterweight are suspended from both ends of a main rope wound around the sheave of the hoisting machine. The car and the counterweight are moved up and down relative to each other via a main rope by driving a hoist.

However, the governor sheave of the governor 7 is generally made of gray cast iron FC20 or Fe12, which is not very strong, while the governor rope that wraps around the governor sheave is made of hard steel wire. 8 types of wire rope (135k
gf/mm2 class), the governor sheave with low hardness wears out and its diameter decreases, so the rope winding becomes shorter and the elevator, which is detected by the detector of the position detection device, The stopping position of the car becomes deviated from the predetermined position in the hoistway.

(Problem to be solved by the invention) However, if the car shifts and stops, there will be a difference in level between the floor of the car and the floor of the building, which may cause a person to trip and fall when getting on or off the car, which is not desirable from a safety standpoint. .

The present invention has been made in view of the above-mentioned circumstances, and has an object to minimize the wear of the governor sheave, eliminate the deviation of the detection position due to wear, and maintain the accuracy of the stop position of the elevator car over a long period of time. The purpose of the present invention is to provide a speed governor for elevators with a

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a governor rope whose one end is connected to a connector attached to an elevator car, and a tension wheel attached to the other end of the governor rope. , a governor sheave that supports the governor rope connected at both ends to the tension sheave and the connector and rotates as the governor rope moves up and down, and a sheave body of the governor sheave. A sheave groove provided around the periphery,
This is an elevator speed governor comprising titanium nitride coated on the sheave groove.

(Function) In a speed governor equipped with a position detection device that detects the speed and position of an elevator car, the groove surface of a sheave incorporated in the speed governor is coated to form one or two types of layers.

(Example) Next, an example of the present invention will be described. 1 to 5 show a governor rope 12 whose one end is connected to a coupling 13 attached to the heel 5 of the elevator, a tension wheel 11 attached to the other end of the governor rope 12, and a tension wheel 11 attached to the other end of the governor rope 12. a governor sheave 10 that supports a governor rope 12 connected at both ends to a wheel 11 and a connector and rotates as the governor rope 12 moves up and down;
1 shows an elevator governor comprising a sheave groove 41a provided around a sheave body 41 of a governor sheave 10 and a titanium nitride (TiN) layer 41b covering the sheave groove 41a.

That is, the speed governor 7, which rotates in conjunction with the rise and fall of the car 5, is used as a position detection device for detecting the vertical position of the elevator heel 5. In other words, the speed governor 7 is provided in the upper machine room 2. A sheave shaft 9 is fixed in a cantilever manner to a bearing stand 8, and a governor sheave ]0 is rotatably attached to the fixed sheave shaft 9, and the governor sheave ]0 and the bottom pit of the hoistway 1 are connected to each other. An endless speed governor rope 12 is provided across the tension wheel 11 provided, and the middle of the speed governor rope 12 is connected to the heel 5 by a connecting tool 13 to control the speed of the elevator car 5. As the governor sheave 10 rotates in conjunction with the engine rope 12, the speed of the car 5 is detected by the governor mechanism provided in the governor sheave 10. A position detection device 14 is attached to the speed governor 7, and the rotation of the speed governor 7 is used to detect the vertical position of the car.

A thrust bearing is built into the head 8a of the bearing stand 8, and a rotary sheave shaft 9 is rotatably and cantileverly supported by the thrust bearing so as to protrude horizontally forward. A governor sheave 10 is attached to the front end side of the sheave shaft 9, and this sheave 10 and the sheave shaft 9
rotates in conjunction with the rise and fall of the heel 5 of the elevator via a rope. A protruding portion 9a in the shape of a polygonal rod is integrally formed on the rear end side (end on the opposite side of the sheave) of the rotary sheave shaft 9 of the speed governor 7 and protrudes from the center of this end face.

When the sheave 10 of the speed governor 7 rotates via the rope as the elevator car goes up and down, the position detection device 14 installed in this manner detects the rotation of the detector unit 21 for position detection through a joint on the rotating sheave shaft 9. By interlocking the shaft 22, a slit disk (not shown) rotates in synchronization with the sheave 10, and the detector generates a pulse depending on the presence or absence of a slit due to the rotation of the slit disk, and the digital signal of the pulse is sent to the detection unit. The signals are sent and calculated to detect the position of the car relative to a predetermined position in the elevator hoistway.

That is, the present invention provides a sheave for a speed governor, in which the rope groove provided on the outer periphery of the sheave body is plated with titanium carbide (TiC) or hard chrome plating by electroplating, and then a TiC coating is applied thereon. This eliminates wear on the sheave due to slipping and allows accurate car position detection over a long period of time.

That is, in the governor sheave 10, a sheave groove 41a is formed on the outer periphery of the sheave body 41, and the surface of the sheave groove 41a is heated to a processing temperature of about 350°C in a vacuum evaporation apparatus, and then 10- Nitrogen gas at a rate of about 50 to 100 cc/min is applied to a vacuum of about 3 to 10-' Torr at a rate of about 6
By evaporating titanium (Ti) while continuously supplying it for about 0 to 90 minutes, titanium nitride (Ti) with a thickness of about 3 to 5 layers is produced.
TiN) layer 41b is formed.

Table 1 shows an example of the results of measuring the hardness and adhesion strength of TiN coated on cast iron.

Since the hardness of the rope shown in Table 1 is about Vickers hardness 41a when calculated from tensile strength, there is almost no wear on the sheave. An example is shown in Figure 4. Figure 6 shows Fe12 (
sheave material) and 345C quenched and tempered material (rope equivalent material) 6
FIG. 7 shows the wear characteristics of TiN coating material 71 and 545C tempered material 72.

It is clearly seen that the TiC coating significantly reduces wear.

Table 2 also shows the sheave, rope and Ti under oil lubrication conditions.
This is an example of the results of measuring the friction coefficient between N coating material and steel.

Table 2 shows that even with TiN coating, the coefficient of friction is higher than that of the cast iron/steel combination, and it can be said that the coating is suitable for sheaves.

In this way, the governor sheave of the present invention has TiN in the sheave groove.
By applying the coating, wear on the sheave groove is greatly reduced, making it possible to accurately detect the car position over a long period of time.

The above-mentioned example is about a sieve coated with only TiN, but in order to improve the adhesion of the TiN coating to the sieve material, the surface of the sieve material is coated with Vickers hardness by electroplating as shown in FIG. 400～
The hard Cr plating layer 41c of about 1000 is 10 to 20ρ
By forming a TiN layer 41b on the TiN layer 41b of about 3 to 5 layers using a vacuum evaporation apparatus, the adhesion of the coating layer can be stabilized and the quality can be improved.

〔Effect of the invention〕

As described above, according to the present invention, in a speed governor equipped with an elevator car position detection device, T is provided in a groove of a sheave.
By coating with iN's coating material (ceramic thin film), the amount of wear is significantly reduced without lowering the friction coefficient, and the car position can be detected with high precision over a long period of time without having to make correction adjustments to the position detection device. Reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a front view of an elevator system showing an embodiment of the present invention, FIG. 2 is a side sectional view of a governor sheave portion, and FIG. 3 is a partially cutaway sectional view of the governor sheave. FIG. 4 is a partially cutaway sectional view of FIG. 3, FIG. 5 is a partial sectional view of the sheave groove, FIGS. 6 and 7 are characteristic diagrams, and FIG.
The figure is a sectional view of a sheave groove showing another embodiment. 7... Speed governor 10... Governor sheave 14... Position detection device 41a... Sheave groove 41b... Surface coating material 41c... Lower coating material agent Patent attorney Norio Ogo Figure Figure Figure 1a Figure Figure Figure f'c! IJ=fi Figure 1c 4+a Figure

Claims (1)

[Claims] A speed governor rope whose one end is connected to a connector attached to the elevator car, a tension wheel attached to the other end of the governor rope, and both ends connected to the tension wheel and the connector. a governor sheave that supports the governor rope and rotates as the governor rope moves up and down; a sheave groove provided around the sheave body of the governor sheave; A speed governor for an elevator comprising titanium nitride coated on a sheave groove.