JPS61140486A - Governor for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an elevator governor that detects abnormal overspeed of an elevator car in conjunction with the vertical movement of the elevator car.

[Technical background of the invention and its problems]

Generally, in an elevator, a car 2 is suspended in a hoistway 1 of a building by a main row 13 and is driven up and down while being guided along left and right guide rails 4, as shown in FIG.

In such an elevator, if an abnormality occurs for some reason during the operation of the car 2, especially during the descending operation, and the car 2 descends at an overspeed exceeding the specified limit, it will be in a very dangerous situation. A speed governor (also referred to as a governor device) 5 is installed above the hoistway 1 in order to detect overspeed of the elevator 2 and stop the operation of the elevator to avoid this danger. The speed governor 5 rotates in conjunction with the movement of the car 2 via the governor rope 8, which is wound around the governor rope 8 and the governor tensioner 7 disposed at the lower part of the hoistway 1.
The overspeed of the elevator car 2 is detected using the centrifugal force of the weight generated by the rotation of the governance 16. When overspeed is detected, the elevator operating circuit is first shut off before a dangerous condition is reached. to stop the elevator.

If the car 2 still descends rapidly, the speed governor 5 stops the governor rope 8, and as a result, the governor rope 8 is pulled up relative to the descending car 2, thereby linking the governor rope 8. By operating the emergency stop devices [10] provided at the bottom of both sides of the car 2 via the mechanism 9,
A mock test device provided in the device 10 is designed to forcefully grip the guide rail 4 and completely stop the car 2.

By the way, as shown in FIG. 6, the conventional elevator speed governor 5 described above has a base 1 fixed above the machine above the hoisting path.
A bearing stand 12 is mounted on the bearing stand 12, and the governance 76 is rotatably mounted on the stand 12 via a shaft 13, and the governance 76 has fulcrums 14a and 14b at symmetrical positions centering on the shaft 13 on the front side. Weight 14A
, 14B, and both weights 14A, 14
Providing a connecting rod 15 that connects B to interlock each other,
In addition, a spring 16 such as a compression spring is provided to balance the centrifugal force of the weights 14A and 14B.

When the governor sheave 6 rotates in conjunction with the car 2 through the governor rope 8, the rotation causes the weight 14 to
A centrifugal force acts on A and 14B, and this centrifugal force causes the weights 14A and 14B to move toward the outer periphery around the fulcrums 14a and 14b, respectively, while interlocking with each other via the connecting rod 15 (
The springs 16 are rotated in the direction in which they spread out from each other, and are spread to a position where they balance the spring 16 that exerts a force against it. In other words, as the centrifugal force changes according to the speed of car 2, weight 14A,
Since the degree of spread of 14B changes, its weight 1
The overspeed of the car 2 is detected from the degree of spread of 4A and 14B, and the above-mentioned elevator operation circuit is cut off or an emergency stop device is operated.

However, the conventional governor 5 has the following problems. That is, as shown in FIG. 7, the weight 14A changes depending on the rotational speed of the governor sheave 6.

Centrifugal forces F and F' act on the center of gravity G and G' of 14B,
The weights 14A, 14B expand to a position where they balance each other with the spring 16, but when acceleration is applied to the governance 76, the center of gravity G of the weights 14A, 14B
, G' as well as the above-mentioned centrifugal force, inertia forces E and E' act on G', and this inertia force E.

The point of action of E' is the center of gravity G, G') and the fulcrums 14a, 14b
If there is a distance k as shown in the figure, the inertial force E,
E' becomes a force that rotates the weights 14A, 14B around the fulcrums 14a, 14b. For this reason, when velocity is detected based on the degree of spread of the weight due to the centrifugal force, it is affected by acceleration, which makes appropriate detection difficult and may lead to malfunction. In particular, vibrations caused by passengers jumping around in car 2 could cause malfunctions. Note that the influence of this type of acceleration is due to weight 14A.
, 14B can be improved by eliminating the above-mentioned distance k, but it is impossible to completely eliminate it with the above-mentioned conventional rotary weight structure.

In addition, in the above configuration, an inertial force E n due to acceleration also acts on the center of gravity G n of the connecting rod 15, which becomes a force to rotate the weights 14A, 14B around the fulcrums 14a, 14b in the same way as above. This was one of the causes of governor malfunction.

[Purpose of the invention]

This invention was created in view of the above circumstances, and although it has a simple structure, it can eliminate the influence of the inertial force of the weight due to acceleration, and has a very high performance. The purpose is to provide an accurate and highly reliable speed governor for elevators.

[Summary of the invention]

The elevator speed governor of this invention has a pair of weights of 4
The weights are connected by parallel links, and both weights and at least one of the other link fulcrums are supported via guides that slidably guide the governor sheave in the radial direction thereof, and the centrifugal force of the weights is The guide receives the inertial force of the weight due to acceleration, and the weight is deflected only by the centrifugal force, making it possible to accurately detect overspeed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Components having the same configuration as those shown in FIGS. 5 to 7 above are designated by the same reference numerals, and the explanation thereof will be simplified.

Here, as shown in FIG. 1, the pair of weights 24A and 24B, which are disposed at symmetrical positions with respect to the axis 13 on the front side of the governance 76, have a simple rectangular shape, and their respective back sides As shown in FIG. 2, a bearing 25 such as a ball bearing is provided in the section, and the bearing 25 is slid onto a guide rod 28 fixed to the front side of the governance 16 via a pair of brackets 26 and 27. By fitting, the links 29A and 29A are respectively provided so as to be slidably guided and supported only in the radial direction of the governance 76.
298, 29G, and 29D, and are connected to each other via pivot pins 30a and 30b.

The pivot pins 3-Oa and 30b, which are the fulcrums on one diagonal of the parallel links 29A to 290, are attached to the weights 24A and 24B, but the pivot pin 30C130d, which is the fulcrum on the other diagonal, is attached to the weights 24A and 24B. are attached to sliding bodies 31A and 31B that are arranged symmetrically about the shaft 13 in a direction perpendicular to the arrangement direction of the weights 24A and 24B on the front side of the governor sheep 6 in a cross shape. The sliding bodies 31A and 31B are connected to the weight 2 as shown in FIG.
4A and 24B, it has a bearing 32 on the back surface, and by sliding the bearing 32 on the guide rod 35 fixed to the front side of the governor sheave 6 via a pair of brackets 33 and 34, The weight 24 of the governance 76
It is guided and supported so as to be slidable in the radial direction orthogonal to the sliding direction of the parts A and 24B. Furthermore, a balance spring 37 is provided between one of the sliding bodies 31A and a bracket 36 provided on the side closer to the central axis 13 of the governance 16 to balance the centrifugal force of the weights 24A and 24B.

Therefore, the governor sheave 6 is connected to the car 2 by the governor lobe 8.
When rotated in conjunction with the weight 24A, the rotation causes the weight 24A to
, 24B act on the centers of gravity of the weights 24A, 24B as shown in FIG. They slide toward the outer periphery (in the direction in which they spread out from each other) and spread out to a position where they are balanced by the balance spring 37 that exerts a force against it. When the rotation speed of the governance 76 increases and the spread of the weights 24A and 24B exceeds a certain range, overspeed of the car 2 is detected and the above-mentioned elevator operation circuit is cut off or the emergency stop device is activated. I started to do things like that.

By the way, when acceleration is applied to the governance 76, not only the centrifugal force but also the inertial forces E and E' act on the centers of gravity of the weights 2.4A and 24B.
' acts in a direction perpendicular to the guide rod 28 of each weight, so it is only received by the governor sheave 6 from the guide rod 28, and does not act as a force in the direction of spreading the weights 24A, 24B apart. In addition, four balanced links 29A~
An inertial force Err due to acceleration also acts on each center of gravity of the weight 29D, but the resultant force of these inertial forces E'' is the weight 24A,
Since the fulcrum part of 24B is perpendicular to the guide rod 28, the governor sheave 6 is connected from the guide rod 28 as described above.
The weights 24A and 24B do not act as a force in the direction of spreading them apart. Therefore, the governor sheave 6
There is no influence of centrifugal force due to the acceleration of weight 24A,
By responding only to the centrifugal force generated according to the speed of the 24B basket 2, appropriate speed detection can be performed with high precision without causing malfunction.

In addition, in the above embodiment, four parallel links 29A to 29D
Both of the fulcrum pins 30c and 30d other than the weight side were provided with sliding bodies 31A and 3181% to guide them, but
Either one of them can be left free. Further, various changes may be made without departing from the gist of the water-saturated invention.

〔Effect of the invention〕

As described above, the present invention connects a pair of weights with four parallel links, and guides each of the weights and at least one of the other link fulcrums so as to be slidable in the radial direction of the governor sheave. The guide supports the weights through the guides, and has a spring that balances the centrifugal force of the weights.Although it is a simple structure, the inertial force of the weights due to acceleration is received by the guides, and the inertial force of the weights due to acceleration is reduced. This is an extremely accurate and highly reliable elevator governor that can reliably eliminate the influence and the weight is deflected only by centrifugal force, allowing accurate overspeed detection.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention.
Figure 1 is a front view, Figure 2 is a view along the line ■-■ in Figure 1, Figure 3 is a view along the line ■-■ in Figure 1, and Figure 4 is an explanatory diagram of the action. , FIG. 5 is a schematic diagram of an elevator with a general speed governor, FIG. 6 is a front view of a conventional speed governor, and FIG. 7 is an explanatory diagram of the operation of the conventional speed governor. DESCRIPTION OF SYMBOLS 1... Hoistway, 2... Car, 3... Main lobe, 4... Guide rail, 5... Governor, 6... Governor sheep, 7... Governor tensioner, 8... ...Governor rope, 9...Link mechanism, 10...Emergency stop device, 11...Base, 12...Bearing stand, 13
...Axis, 24A, 24B...Weight, 25.32
...Bearing, 26, 27.33.34.36-...Bracket, 28.35...Guide rod, 29A, 298.
29G, 29D...Parallel link, 3(ja, 30b,
30c, 30d... fulcrum, 31A, 31B... sliding body, 37... balance spring. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 4 ρ Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In an elevator governor, a governor sheave is rotationally driven via a governor rope interlocked with an elevator car, and the overspeed of the elevator is detected by using the movement of a pair of weights caused by centrifugal force as the governor sheave rotates. A pair of weights are connected by four parallel links, and both weights and at least one of the other link fulcrums are each supported via a guide that slidably guides the governor sheave in the radial direction thereof, and A speed governor for an elevator, characterized in that it is configured with a spring that balances the centrifugal force of the weights.