JP4744861B2 - Elevator governor - Google Patents

Description

  The present invention relates to a governor that detects an overspeed of an elevator car or a counterweight and operates an emergency stop device that stops the car.

  Article 129-9 No. 7 of the Building Standard Law Enforcement Ordinance stipulates that an elevator must be equipped with a device that automatically stops the lowering of the car when the lowering speed of the car exceeds a predetermined value. ing. Generally, a device called an emergency stop device is mounted on the car.

  FIG. 7 is a view showing a schematic structure of a general elevator in which the emergency stop device is mounted on a passenger car. The car 1 is suspended by a main rope 2, and the main rope 2 is driven by a hoisting machine (not shown) so that the car 1 moves up and down in the hoistway and is guided by a guide rail 3 provided in the hoistway. Guided up and down.

  An emergency stop device 4 is mounted on the car 1, and the main rope 2 is cut or the speed of the hoisting machine becomes abnormal and the speed of the car 1 exceeds the rated speed. In this case, the guide rail 3 is gripped and the car 1 is mechanically stopped.

  That is, when the speed governor 5 provided in the machine room detects an overspeed of the car 1, the rope gripping mechanism 6 incorporated in the speed governor 5 is activated and is wound around the sheave of the speed governor 5. The governor rope 7 is restrained. The rope gripping mechanism 6 is configured to operate in conjunction with a centrifugal weight mechanism that is swingably attached to the sheave. When the governor rope 7 is restrained in this way, the emergency stop device 4 is operated via the safety link 8 attached to the car 1.

  FIG. 8 is a front view showing an example of a governor, and FIG. 9 is a plan view of FIG. This speed governor uses an operation lever and a ratchet wheel for the rope gripping mechanism 6. In order to realize the above function, the sheave 9 is supported by a bearing 10 so as to be rotatable, and the bearing 10 is held and fixed by a support 12 via a bearing holder 11.

  A pair of centrifugal weight mechanisms 13 are swingably attached to the sheave 9. These centrifugal weight mechanisms 13 are connected to each other by a link 14, and a speed adjustment spring 15 that resists centrifugal force is provided between one end of one centrifugal weight mechanism 13 and the sheave 9. When the pair of centrifugal weight mechanisms 13 are displaced toward the outer peripheral side of the sheave 9 against the speed adjusting spring 15, they are displaced by the same amount in synchronization with the link 14. An operation unit 16 is provided at the other end of each centrifugal weight mechanism 13. Further, a claw 17 is connected to the centrifugal weight mechanism 13, and this claw is rotatably attached to the sheave 9.

  A ratchet wheel 18 is coaxially attached to the sheave 9. On the outer peripheral portion of the ratchet wheel 18, a tooth portion that can be engaged with the claw 17 only when the sheave 9 rotates in one direction is provided. A rod 19 of the rope gripping mechanism 6 is connected to the ratchet wheel 18, and an operating lever 20 is attached to the rod 19 so as to be movable in the axial direction, and a shoe 21 is rotatably attached to the operating lever 20. ing. Reference numeral 22 denotes a spring that urges the rod 19 toward the operation lever 20 in a direction away from the ratchet wheel 18.

  The support body 12 is arranged at an interval in the rotational axis direction of the sheave 9, and an overspeed detection switch 24 is attached via an attachment portion 23. The overspeed detection switch 24 has an operating arm 25 and is located outside the rotation locus of the operating portion 16 of the centrifugal weight mechanism 13.

  When the car 1 moves up and down, the governor rope 7 moves in synchronization with this, and the sheave 9 rotates. As a result, the pair of centrifugal weight mechanisms 13 are displaced while receiving a centrifugal force proportional to the rotational speed of the sheave 9.

  When the car 1 exceeds the first predetermined speed, a centrifugal force exceeding the drag force of the speed adjusting spring 15 acts on the pair of centrifugal weight mechanisms 13 and the centrifugal weight mechanisms 13 are displaced to the outer peripheral side of the sheave 9. . Thereby, the operation part 16 contacts the operation arm 25 of the overspeed detection switch 24, the overspeed detection switch 24 is operated, and the power supply of the hoisting machine is shut off.

  As a result, the car 1 normally stops. However, if the car 1 continues to descend without stopping for some reason and exceeds the second predetermined speed, the centrifugal weight mechanism 13 is further displaced to the outer peripheral side of the sheave 9. The claw 17 rotates and engages with the ratchet wheel 18, and the ratchet wheel 18 rotates. As a result, the rod 19 of the rope gripping mechanism 6 is pulled against the drag of the spring 22, and the shoe 21 sandwiches the governor rope 7 between the sheave 9 and fixes it.

  Other examples of the rope gripping mechanism include a mechanism that restrains the rotation of the sheave and stops the governor rope 7 only by the frictional force between the governor rope and the sheave, and a spring that presses the governor rope. There are things that hold the governor rope with a gripping arm that is built in.

  In such a rotating device, in order to hold and fix the bearing 10 while avoiding a rotating object such as the centrifugal weight mechanism 13 rotating with the sheave 9, a mechanical structural gap is required in each part.

  In the recent elevator industry, there is a strong demand for building space saving, and there is an increasing demand for elevators without machine rooms in which hoisting machines and control devices are installed in hoistways. Further, even in an elevator with a machine room similar to the conventional one, space saving of the machine room is required. In order to meet such a space-saving requirement, it is necessary to reduce the size of elevator components, but the following problems arise when attempting to reduce the thickness of the governor.

  (1) Although the size of the governor is greatly influenced by the size of the sheave, there is a limit to reducing the sheave diameter from the viewpoint of durability of the governor rope to be used.

  (2) Stable operation of the governor, and a heavy (large) centrifugal weight is required to ensure reliability.

  (3) A mechanical structural gap is required between the rotating body and the non-rotating body.

  (4) Machine structural dimensions are required to hold and fix bearings for holding rotating bodies such as sheaves.

  The present invention has been made in view of the above problems, and by efficiently arranging the components constituting the governor, the gap in the mechanical structure is filled, and the structure space is effectively utilized to reduce the size and thickness. It aims at providing the governor which aimed at.

In order to solve the above-mentioned problems, the present invention guides a governor rope connected to a car or counterweight that moves up and down in a hoistway around a rotatable sheave, and the rotational speed of the sheave is predetermined. When the speed is exceeded, a centrifugal weight mechanism swingably attached to the sheave activates a rope gripping mechanism to restrain the governor rope, and further activates an emergency stop device attached to the car. An elevator governor that stops the car,
A support body disposed at an interval in the rotation axis direction with respect to the sheave;
A bearing that rotatably supports the rotating shaft of the sheave;
The sheave and provided between the support and a bearing holder for fixedly holding the bearing in cooperation with said support in a state that the bearing is in contact with said support,
The bearing holder is formed in an annular shape, and receives the bearing concentrically from one surface thereof, and supports the outer ring of the bearing slightly protruding from the one surface.
It is characterized by that.

  According to the present invention, the gap on the mechanical structure of the speed governor can be reduced, and the structural space can be used effectively. Therefore, a small and thin speed governor can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view of a sheave and a bearing structure thereof according to a first embodiment of the present invention. In the present embodiment, the same reference numerals are used for parts that are the same as or similar to those in the above-described conventional example, and redundant descriptions are omitted.

  As shown in FIG. 1, a support body 12 is arranged so as to face the sheave 9 in the direction of the rotation shaft 9 a with an interval, and the rotation shaft 9 a is attached to the support body 12 via a bearing 10 and a bearing holder 11. It is supported.

  In the present embodiment, the bearing holder 11 is formed in an annular shape, receives the bearing 10 concentrically from one surface thereof, and the outer ring 10 a of the bearing 10 slightly protrudes from one surface of the bearing holder 11. The bearing 10 is supported by.

  Then, by attaching and fixing one surface of the bearing holder 11 toward the inner surface of the support 12 to the support 12, the outer ring 10 a of the bearing 10 abuts on the support 12 and the bearing 10 is held and fixed. It is like that.

  According to such a configuration, a retaining ring or the like for fixing the bearing 10 to the bearing holder 11 becomes unnecessary, and the bearing holder 11 is moved in the direction of the rotary shaft 9a by the dimension for attaching such a retaining ring. Therefore, the speed governor can be thinned.

  Next, a second embodiment of the present invention will be described. FIG. 2 is a front view of the sheave and the centrifugal weight mechanism of the second embodiment, showing a state in which the centrifugal weight mechanism is swung, and FIG. 3 is a cross-sectional view of a portion A in FIG. In these drawings, some mechanisms are omitted in order to make the drawings easier to see.

  As shown in FIG. 2, in the present embodiment, the pair of centrifugal weight mechanisms 13 that are swingably attached to the sheave 9 are configured to swing in a region inside the outer peripheral surface of the sheave 9. . Since the height dimension of the speed governor depends on the rotation trajectory of the centrifugal weight mechanism 13, the height dimension of the speed governor is ensured by preventing the centrifugal weight mechanism 13 from protruding from the outer peripheral surface of the sheave 9 when swinging. The speed governor can be reduced in size.

  Moreover, in this embodiment, the recessed part 13a (refer FIG. 3) is provided in the connection part A with the link 14 in the centrifugal weight mechanism 13, and the reduction | decrease of the dimension of the depth direction (thickness direction of the sheave 9) of a governor is aimed at. Yes. That is, the centrifugal weight mechanism 13 and the link 14 are rotatably connected by a support shaft 26 parallel to the rotation shaft 9 a of the sheave 9, and one end of the support shaft 26 is coupled to the link 14 via a bearing 27. Yes. One end of the bearing 27 protrudes from the one surface of the link 14 toward the centrifugal weight mechanism 13, and the protruding portion is received by the recess 13 a, thereby reducing the thickness t of the gap between the link 14 and the centrifugal weight mechanism 13. is doing.

  The bearing is also provided on the support shaft of the connecting portion B (see FIG. 2) of the rod 18 that supports the speed adjusting spring 15 and the centrifugal weight mechanism 13, and the connecting portion B is also provided with a similar recess, Similar effects can be obtained.

  Next, a third embodiment of the present invention will be described. FIG. 4 is a cross-sectional view of a main part of the third embodiment.

  In the present embodiment, the centrifugal spindle mechanism 13 and the sheave 9 are connected and a support shaft 29 parallel to the rotation shaft 9a, and the claw 17 and the sheave 9 are connected and a support shaft 31 parallel to the rotation shaft 9a are axially connected. They are arranged so as not to overlap. By doing in this way, since the space for attaching the nuts 30 and 32 for couple | bonding the spindles 29 and 31 with respect to the sheave 9 can be reduced, surrounding parts can be arrange | positioned efficiently. .

  Further, the sheave 9 is provided with a recess 9b for receiving the nuts 30 and 32 in the axial direction of the support shafts 29 and 31. By doing in this way, since the dimension of the depth direction of a speed governor can be reduced, size reduction of a speed governor can be achieved.

  Next, a fourth embodiment of the present invention will be described. FIG. 5 is a front view of the main part of the fourth embodiment, and FIG. 6 is a cross-sectional view of the main part of the fourth embodiment.

  In this embodiment, the operation part 16 provided in the centrifugal weight mechanism 13 is arrange | positioned on the rotation locus | trajectory (it shows with a virtual line in FIG. 5) of the nail | claw 17 attached to the sheave 9. FIG. In this way, as shown in FIG. 6, the operating portion 16 and the claw 17 overlap in the rotation direction, so that the dimension of the speed governor in the depth direction (thickness direction of the sheave 9) can be reduced. The speed machine can be miniaturized.

  In the conventional structure, as shown in FIG. 10, the thickness T (see FIG. 10) between the surface of the sheave 9 that faces the support 12 and the support 12 (see FIG. 10) needs to be greater than the thickness T ′ + 7 mm of the bearing 10. However, according to the present invention, this T can be reduced to the thickness of the bearing 10 + 7 mm or less, and the speed governor can be made thinner.

  In the above embodiment, the governor rope is connected to the car. However, the governor rope may be connected to a counterweight. In addition, various modifications can be made to the above embodiment without departing from the gist of the present invention.

1 is a partial cross-sectional view of a sheave and a bearing structure thereof according to a first embodiment of the present invention. It is a front view of the sheave and the centrifugal weight mechanism of the second embodiment, and shows a state where the centrifugal weight mechanism is rotated. Sectional drawing of the A section of FIG. Sectional drawing of the principal part of 3rd Embodiment. The front view of the principal part of 4th Embodiment. Sectional drawing of the principal part of 4th Embodiment. The figure which shows schematic structure of the common elevator with which the emergency stop apparatus was mounted | worn with the passenger car. The front view which shows an example of a governor. The top view of FIG. Explanatory drawing of the structure of the conventional governor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Riding car 4 Emergency stop device 5 Speed governor 6 Rope gripping mechanism 7 Speed governor rope 9 Sheave 9a Rotating shaft 9b Recessed part (coupling member)
DESCRIPTION OF SYMBOLS 10 Bearing 11 Bearing holder 12 Support body 13 Centrifugal weight mechanism (operation member)
13a Concave part 14 Link (operation member)
26 Support shaft 27 Bearing (coupling member)
29 Support shaft 31 Support shaft

Claims (1)

A governor rope connected to a elevator car or a counterweight that moves up and down in the hoistway is wrapped around a rotatable sheave and guided so that the sheave can swing freely when the rotational speed of the sheave exceeds a predetermined speed. A controlled speed for an elevator in which the centrifugal weight mechanism actuates a rope gripping mechanism to restrain the governor rope, and further operates an emergency stop device mounted on the car to stop the car Machine,
A support body disposed at an interval in the rotation axis direction with respect to the sheave;
A bearing that rotatably supports the rotating shaft of the sheave;
The sheave and provided between the support and a bearing holder for fixedly holding the bearing in cooperation with said support in a state that the bearing is in contact with said support,
The bearing holder is formed in an annular shape, and receives the bearing concentrically from one surface thereof, and supports the outer ring of the bearing slightly protruding from the one surface.
An elevator governor characterized by that.

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