JP2021088428A - Speed governor for elevator - Google Patents

Abstract

To prevent jumping and falling of a governor rope when the governor rope is braked.SOLUTION: A speed governor 8 for elevator includes: an endless governor rope 11 which is hooked on a governor pulley 9 and is circulated and moved accompanied by a lifting operation of a car 4; a governor rope gripping part which performs operation of bringing a movable shoe member (catch weight 27) into close contact with a fixing shoe member (contact plate 26) when a lifting speed of the car 4 reaches a predetermined overspeed, and sandwiches one side of the governor rope 11 hooked on the governor pulley 9 between the movable shoe member and the fixing shoe member and brakes the governor rope; and a tension adjustment part 30 which is configured so as to be slidable in a travel direction of the governor rope 11, and displaces a partial member of the governor rope gripping part to the travel direction of the governor rope 11 by an elastic body when the governor rope gripping part sandwiches the governor rope 11.SELECTED DRAWING: Figure 2

Description

The present invention relates to an elevator governor that monitors the speed of a car as an elevator security mechanism.

Conventionally, a general elevator has an elevator speed governor that activates an emergency brake provided in the car to stop the car as a safety mechanism when the car becomes overspeeding than the specified speed. It is provided.

The structure of the elevator speed control device is, for example, a governor rope that circulates and moves as the car moves up and down separately from the main rope, an operating lever that connects the governor rope and the emergency brake, and a shoe that can be braked by gripping the governor rope. Those equipped with a mechanism are widely known. In the elevator speed control machine configured in this way, when the overspeed state of the car is detected, the governor rope is gripped and braked by the shoe mechanism, so that the operating lever moves as the car moves and the emergency brake is applied. Can be activated.

However, when the governor rope is gripped in an overspeed state, the governor rope in the gripped portion is suddenly decelerated, and sudden tension changes (tension difference) occur on both sides of the governor rope hung on the governor pulley, so that the governor rope is sent to the governor pulley. There is a risk that the governor rope will jump up on the circumference of the governor pulley and fall off. Therefore, various devices have been devised in order to prevent the governor rope from jumping up in the gripping operation of the governor rope.

For example, in Patent Document 1, "a cover provided so as to cover at least the upper portion and the side portion of a sheave around which a main rope for suspending an elevator car and a balance weight is wound is configured to be separable in the circumferential direction. , An elevator hoisting device is disclosed in which a plurality of stoppers extending in a direction intersecting the main rope are movably attached to the inside of the cover in a direction in which the rope is brought into contact with and separated from the main rope. There is.

Further, for example, Patent Document 2 states, "A conventional first rope catching device for restraining a governor rope on the descending side when the descending speed of a car or a counterweight becomes excessive, and further restraining the governor rope on the ascending side. A second rope catching device is provided. ”A speed governor device for an elevator is disclosed.

Japanese Unexamined Patent Publication No. 2004-035130 Japanese Unexamined Patent Publication No. 7-076471

However, although the elevator hoisting device disclosed in Patent Document 1 is provided with a stopper on the governor pulley (shave), there is a gap between the governor pulley and the stopper. , There is a risk that the governor rope may bend or become entangled due to a sudden change in tension when the governor rope is gripped.

Further, in the elevator speed control device disclosed in Patent Document 2, the first and second rope catching devices simultaneously restrain both sides (upward side and downward side) of the governor rope hung on the governor pulley (sheave). As a result, it is possible to suppress a sudden change in tension when the governor rope is restrained, but there is a problem in maintenance management of the rope catching device. Specifically, as the first problem, when installing the rope catch device, it is necessary to adjust the pressing springs for the governor ropes on both sides at the same time, and this work is not easy. As a second issue, it is assumed that the spring force of the pressing springs on each side will differ with the passage of time after installation, but the spring force will be readjusted while considering the left-right balance for maintenance. The work is not easy.

The present invention has been made in consideration of the above points, and proposes an elevator speed governor capable of preventing the governor rope from jumping up or falling off by relaxing the change in tension of the governor rope when braking the governor rope. It is something to try.

In order to solve such a problem, in the present invention, it is an elevator speed governor that monitors the ascending / descending speed of an elevator car, and is an endless governor rope that is hung on a pulley and circulates and moves with the ascending / descending operation of the car. When the elevator speed of the car reaches a predetermined overspeed, the movable shoe member operates to approach the fixed shoe member, and one side of the governor rope hung on the pulley is fixed to the movable shoe member. A governor rope grip portion that is sandwiched between a shoe member and brakes, and a governor rope grip portion that is slidable in the traveling direction of the governor rope, and when the governor rope grip portion sandwiches the governor rope, one of the governor rope grip portions is formed by an elastic body. Provided is an elevator speed governor including a tension adjusting portion that displaces a member of the portion in the traveling direction.

According to the present invention, when braking the governor rope, it is possible to prevent the governor rope from jumping up or falling off.

It is the schematic block diagram of the elevator to which the elevator speed governor which concerns on 1st Embodiment is applied. It is a detailed block diagram of the elevator speed governor which concerns on 1st Embodiment. It is a figure which shows the state of the speed governor immediately after the support lock state is released in the governor rope gripping operation of 1st Embodiment. It is a figure which shows the state of the speed governor after gripping a governor rope in the governor rope gripping operation of 1st Embodiment. It is a detailed block diagram of the shoe mechanism of the elevator speed governor which concerns on 2nd Embodiment. It is a figure which shows the state of the speed governor after gripping a governor rope in the governor rope gripping operation of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(1) First Embodiment (1-1) Structure of Elevator 1 and Speed Governor FIG. 1 is a schematic configuration diagram of an elevator to which the elevator speed governor according to the first embodiment is applied. FIG. 1 shows an elevator 1 as an example of an elevator equipped with an elevator speed governor 8 (hereinafter, referred to as a speed governor 8) according to the first embodiment of the present invention.

As shown in FIG. 1, the elevator 1 has a hoisting machine installed in the upper part of the hoistway, and the car 4 is connected to one end of the main rope 3 wound around the traction sheave 2 of the hoisting machine. The balance weight 5 is connected to the other end of the main rope 3. The car 4 is configured to be movable up and down along a pair of guide rails 6 installed in the hoistway, and the balance weight 5 is configured along the other pair of guide rails 7 installed in the hoistway. It is configured to be able to move up and down. Further, a speed governor 8 is provided as a security mechanism for preventing the car 4 from suddenly falling in an emergency such as when the main rope 3 is cut.

The speed governor (governor) 8 has a configuration in which a governor rope 11 is wound endlessly between a governor pulley 9 arranged at the upper part of the hoistway and a tension pulley 10 installed at the lower side of the hoistway. Have. Further, as shown in FIG. 1, an emergency brake 12 is arranged in the lower part of the car 4, and one end of the operating lever 13 attached to the car 4 is connected to the operating body side of the emergency brake 12 to operate. A governor rope 11 is connected to the other end of the lever 13. Therefore, the governor rope 11 of the speed governor 8 moves up and down in synchronization with the car 4 via the operating lever 13.

Although the details will be described later, in the speed governor 8 configured as described above, the ascending / descending speed of the car 4 exceeds the rated speed and is the first overspeed (for example, a speed not exceeding 1.3 times the rated speed). When it is detected that the speed reaches, the power supply of the drive device of the hoisting machine driving the traction sheave 2 and the power supply of the control device controlling the drive device are cut off. Further, when the descending speed of the car 4 reaches the second overspeed (for example, a speed not exceeding 1.4 times the rated speed), the speed governor 8 moves the governor rope 11 by gripping the governor rope 11. By stopping, the operating lever 13 is relatively pulled up, and as a result, the emergency brake 12 is operated to mechanically stop the car 4 in an emergency.

FIG. 2 is a detailed configuration diagram of the elevator speed governor according to the first embodiment. FIG. 2 shows an example of the detailed structure of the governor 8 shown in FIG. The state of the speed governor 8 shown in FIG. 2 is that of the normal time when the car 4 is normally operated in the elevator 1, and the operation of gripping the governor rope 11 (governor rope gripping operation) is not performed. It is in a state.

As shown in FIG. 2, the governor pulley 9 is rotatably supported by a support shaft 15 fixed to the housing 14. As described above, since the governor rope 11 is connected to one end of the operating lever 13 attached to the car 4, when the governor rope 11 moves as the car 4 moves up and down, the governor pulley 9 is centered on the support shaft 15. And rotate.

Arms 16 extending on both sides of the support shaft 15 and rotating together with the governor pulley 9 are provided on the outer peripheral portion of the support shaft 15 of the governor pulley 9, and are formed in a substantially arc shape at both ends of the arm 16. The rotation shafts 19 and 20 of the pendulums 17 and 18 are rotatably connected, respectively. The position of the rotation shaft 19 on the pendulum 17 is biased, and one end 17a thereof is heavier than the other end 17b. Similar to the pendulum 17, the position of the rotation shaft 20 on the pendulum 18 is also biased, and one end 18a of the pendulum 18 is heavier than the other end 18b.

The pendulums 17 and 18 configured as described above rotate together with the governor pulley 9 and the arm 16. At this time, the one ends 17a and 18a of the pendulums 17 and 18 receive centrifugal force and rotate the rotation shafts 19 and 20 so as to be farther from the support shaft 15 than the other ends 17b and 18b.

On the side of the other end 18b of the pendulum 18, a speed adjusting spring 21 that limits the amount of displacement of the other end 18b in the direction approaching the support shaft 15 is arranged. The speed adjusting spring 21 is arranged between the arm portion 16a of the arm 16 and the other end portion 18b of the pendulum 18. Therefore, when the centrifugal force acting on the pendulums 17 and 18 exceeds the resistance force of the speed adjusting spring 21, the speed adjusting spring 21 is elastically deformed, and the pendulums 17 and 18 rotate as a connecting portion with the arm 16. It will rotate around the shafts 19 and 20.

Further, the other end 18b of the pendulum 18 is formed with a claw portion 18c protruding in the direction opposite to the rotation shaft 20 of the pendulum 18. The claw portion 18c is a ratchet 22 when the pendulums 17 and 18 are rotated around the rotation shafts 19 and 20 by centrifugal force and the other end portion 18b of the pendulum 18 is displaced in a direction approaching the support shaft 15. Engage with the tooth portion 22a. Further, at one ends 17a and 18a of the pendulums 17 and 18, the detection contact portions 17d and 18d having a shape protruding outward are formed. The detection contact portions 17d and 18d are members that come into contact with the overspeed switch 23 when the pendulums 17 and 18 rotate beyond a predetermined amount.

The ratchet 22 is rotatably supported by a support shaft 15. The ratchet 22 is formed in a substantially disk shape, and one plane thereof faces the pendulums 17 and 18. A plurality of tooth portions 22a are discretely formed on the outer peripheral surface of the ratchet 22. When the pendulum 18 rotates and one end 18a expands outward by centrifugal force, the other end 18b moves inward and the claw 18c engages with the tooth 22a. At the time of this engagement, the shoe mechanism 24 operates. Further, on the side surface of the ratchet 22, a ratchet pin 22b that engages with the arm portion 25a of the hook 25, which will be described later, is provided.

The shoe mechanism 24 includes a hook 25, a backing plate 26, a catch weight 27, a grip spring 28, a catch weight receiver 29, a tension adjusting portion 30, and the like. Of these, as a member capable of gripping the governor rope 11, the backing plate 26 and the catch weight 27 are collectively referred to as a governor rope gripping portion.

The hook 25 is rotatably supported with respect to the housing 14 by a rotating shaft 31, and one end thereof forms an arm portion 25a extending in the direction of the ratchet 22. Further, at another end of the hook 25, a hook portion 25b that can be engaged with the catch weight pin 27a described later is formed.

The backing plate 26 is a fixed shoe member that sandwiches the governor rope 11 between the movable shoe member (catch weight 27) and the movable shoe member at the governor rope gripping portion. The backing plate 26 is fixed to the housing 14 and faces the governor rope 11 from one side (in the case of FIG. 2, the left side of the governor rope 11). A catchweight 27 is arranged on the other side of the governor rope 11 (on the right side in the case of FIG. 2).

The catch weight 27 is a weight corresponding to a movable shoe member in the governor rope gripping portion, and when gripping the governor rope 11, the catch weight 27 is brought into contact with the backing plate 26 by performing an operation of approaching the backing plate 26 which is a fixed shoe member. The governor rope 11 is gripped (sandwiched) between them. The catch weight 27 has one end on the gripping spring 28 side attached to the rotating shaft so that the other end (free end) on the backing plate 26 side can rotate. Further, the catch weight 27 is urged toward the backing plate 26 by the gripping spring 28. The catchweight 27 is provided with a catchweight pin 27a that can engage with the hook portion 25b of the hook 25, and when this engagement state is released, the catchweight 27 has a rotation shaft on the free end side due to its own weight. By falling while rotating around the center, the free end of the catchweight 27 approaches the backing plate 26 side and grips the governor rope 11.

The gripping spring 28 is an elastic body (for example, a coil spring) that is compressed and arranged between the spring seat 32 and the fixing plate 33 fixed to the housing 14. That is, the gripping spring 28, which is a compression spring, urges the catch weight 27 toward the backing plate 26 via the spring seat 32. However, the catch weight 27 is fixed at the position shown in FIG. 2 while the support lock state in which the hook portion 25b of the hook 25 is engaged with the catch weight pin 27a is held.

The catch weight receiver 29 is a member that falls during the governor rope gripping operation to receive the catch weight 27 that grips the governor rope 11, and is arranged in the moving direction of the catch weight 27 during the governor rope gripping operation, that is, below the catch weight 27 in FIG. Will be done.

The tension adjusting portion 30 is arranged between the catch weight receiver 29 and the housing 14 below the catch weight receiver 29, and is configured to be slidable in the traveling direction of the governor rope 11 by an elastic body. Although the coil spring is shown as an example of the elastic body in FIG. 2, the elastic body of the tension adjusting unit 30 in the present embodiment is not limited to this, and is an elastic body such as a leaf spring or a damper. May be good.

Although the details will be described later, when the governor rope gripping portion (back plate 26 and catch weight 27) grips the governor rope 11, the tension adjusting portion 30 advances the governor rope 11 before gripping together with the catch weight 27 and the catch weight receiver 29. It is displaced so as to sink in a direction (for example, downward in FIG. 2). By this subduction, the tension adjusting unit 30 can alleviate the sudden deceleration of the governor rope 11 on the gripped side, and causes a sudden change in tension (tension difference) on both sides of the governor rope 11 hung on the governor pulley 9. It can be relaxed.

The elastic force required for the elastic body of the tension adjusting unit 30 varies depending on the traveling standard of the elevator 1 and the material of the governor rope 11, but conceptually, the "depth" at which the catchweight 27 sinks. However, it is preferable that the governor rope 11 on the side opposite to the grip side can absorb the "height" that can be lifted by inertia when the governor rope 11 is gripped. For example, in the case of a high-speed elevator, the elastic force may be adjusted so as to sink deeper.

(1-2) Operation of Governor 8 The operation of the governor 8 according to the first embodiment will be described in detail below.

The operation of the speed governor 8 configured as described above is "normal operation" when the ascending / descending speed of the car 4 reaches the first overspeed, and the ascending / descending speed of the car 4 exceeds the rated speed. It can be roughly divided into "power cutoff operation" when it is detected that 1 overspeed has been reached, and "governor rope gripping operation" when it is detected that the ascending / descending speed of the car 4 has reached the second overspeed. it can.

First, the normal operation will be described. For example, when the car 4 descends at the rated speed, the governor rope 11 moves in the same direction together with the car 4 to rotate the governor pulley 9. In FIG. 2, the moving direction of the governor rope 11 when the car 4 descends is indicated by an arrow. Centrifugal force acts on the pendulums 17 and 18 due to the rotation of the governor pulley 9, and when the centrifugal force exceeds the resistance force of the speed adjusting spring 21, the pendulums 17 and 18 rotate around the rotation shafts 19 and 20. To do. In the normal operation, the ratchet 22 does not rotate, and the arm portion 25a and the ratchet pin 22b, and the hook portion 25b and the catchweight pin 27a are maintained in an engaged state. Therefore, the catchweight 27 is held in a state of having a predetermined inclination without the free end touching the governor rope 11 (support lock state).

Next, the power cutoff operation will be described. For example, when the descending speed of the car 4 reaches the first overspeed for some reason, the detection contact portion 17d of the pendulum 17 (or the detection contact portion 18d of the pendulum 18) comes into contact with the overspeed switch 23. .. As a result, the speed governor 8 detects that the ascending / descending speed of the car 4 has reached the first overspeed, and turns on the power supply of the drive device that drives the traction sheave 2 and the power supply of the control device that controls the drive device. Shut off each. In the power cutoff operation, the ratchet 22 does not rotate as in the normal operation, and the arm portion 25a and the ratchet pin 22b, and the hook portion 25b and the catch weight pin 27a are maintained in an engaged state, respectively, and the catch weight 27 The support lock state is maintained.

Next, the governor rope gripping operation will be described in detail.

FIG. 3 is a diagram showing a state of the speed governor immediately after the support lock state is released in the governor rope gripping operation of the first embodiment. Further, FIG. 4 is a diagram showing a state of the speed governor after gripping the governor rope in the governor rope gripping operation of the first embodiment. 3 and 4 are mainly illustrated with the shoe mechanism 24 of the governor 8, and other configurations of the governor 8 are simplified.

Before the governor rope gripping operation is started, the state of the speed governor 8 is the same as the above-mentioned normal operation or power cutoff operation. That is, as shown in FIG. 2, the ratchet 22 is not rotating, and the arm portion 25a and the ratchet pin 22b, and the hook portion 25b and the catchweight pin 27a are each maintained in an engaged state. Therefore, the catchweight 27 is supported with a predetermined inclination without the free end touching the governor rope 11 (support locked state).

Then, in the state of FIG. 2, when the descending speed of the car 4 reaches the second overspeed due to factors such as the main rope 3 being cut, the claw portion provided on the other end 18b of the rotated pendulum 18. 18c engages the tooth portion 22a of the ratchet 22 and rotates the ratchet 22 counterclockwise in FIG. When the ratchet 22 rotates in this way, the hook 25 rotates clockwise about the rotation shaft 31 via the ratchet pin 22b.

Further, the engagement between the hook portion 25b and the catchweight pin 27a is released according to the rotation of the hook 25, so that the support locked state of the catchweight 27 is released. When the support lock state is released, the catchweight 27 starts to fall around the rotation shaft on the spring seat 32 side (see FIG. 3).

After that, as shown in FIG. 4, when the catchweight 27 falls to a position facing the backing plate 26, the governor rope gripping portions (catchweight 27 and the backing plate 26) face each other and sandwich the governor rope 11. At this time, since the catch weight 27 is urged in the direction of the backing plate 26 by the elastic force of the gripping spring 28, the governor rope 11 can be sandwiched between the catch weight 27 and the backing plate 26 for braking. Then, when the car 4 continues to descend after the movement of the governor rope 11 is stopped, the operating lever 13 connected to the governor rope 11 is relatively pulled up, so that the emergency brake 12 is activated and the car 4 is mechanically operated. Emergency stop.

Further, by gripping the governor rope 11, a force is applied to the governor rope gripping portion (catch weight 27 and the backing plate 26) in the traveling direction (for example, downward direction) before gripping the governor rope 11. Here, since the catch weight 27 holding the governor rope 11 comes into contact with the catch weight receiver 29, the force of the governor rope 11 in the traveling direction is transmitted to the tension adjusting unit 30 via the catch weight receiver 29. As a result, the elastic body of the tension adjusting portion 30 is compressed, and the tension adjusting portion 30 slides in the traveling direction (downward in FIG. 2) together with the catch weight 27 and the catch weight receiver 29 and sinks (FIG. 4). See the white arrow).

As described above, since the sinking occurs when the governor rope 11 is gripped, the speed governor 8 can alleviate the sudden deceleration of the governor rope 11 on the gripped side. As a result, the tension difference on both sides of the governor rope 11 hung on the governor pulley 9 is reduced, so that the governor rope 11 on the side opposite to the gripping side jumps up or falls off on the circumference of the governor pulley 9 due to inertial force. Can be prevented.

As described above, the speed controller 8 according to the first embodiment includes an endless governor rope 11 that is hung on the governor pulley 9 and circulates and moves with the elevating operation of the car 4, and the elevating speed of the car. When the movable shoe member (catch weight 27) approaches the fixed shoe member (backing plate 26) when the predetermined overspeed (second overspeed) is reached, the governor rope 11 hung on the governor pulley 9 is operated. A governor rope gripping portion (retaining plate 26 and catch weight 27) that holds one side (for example, the left side) between a movable shoe member and a fixed shoe member for braking, and a governor rope grip that is slidable in the traveling direction of the governor rope 11. It is configured to include a tension adjusting portion 30 that displaces a part of the members of the governor rope gripping portion in the traveling direction by an elastic body when the portion sandwiches the governor rope 11. According to the speed governor 8 configured in this way, the governor rope gripping portion is not a lock structure completely fixed to the housing 14, but the governor rope 11 before being gripped by the slide of the tension adjusting portion 30 during the governor rope gripping operation. Since the structure is displaceable in the traveling direction, not only can the governor rope 11 be braked in an emergency, but also the sudden deceleration of the governor rope 11 at the gripping portion can be alleviated. As a result, the speed governor 8 can suppress a change in the tension of the governor rope 11 (an increase in the tension difference between the governor rope 11 on both sides of the governor pulley 9) due to a sudden increase in the gripping force with respect to the governor rope 11. It is possible to prevent the eleven from jumping up or falling off. In the first embodiment, the tension adjusting unit 30 is arranged at a destination (between the catchweight receiver 29 and the housing 14) where the catchweight 27 moves when the governor rope 11 is sandwiched. Further, the gripping spring 28 is connected to the catch weight 27 and arranged as a member for urging the movable shoe member in the direction of the fixed shoe member by elastic force when the governor rope 11 is pinched.

Further, the tension adjusting unit 30, which is mentioned as a characteristic configuration of the speed governor 8 according to the first embodiment, can be realized by a simple configuration using an elastic body. Further, the configuration of the governor rope gripping portion is to grip one side of the governor rope as in the conventional general elevator speed governor, and the maintenance management thereof does not require any particular difficulty. Therefore, the speed governor 8 according to the first embodiment can obtain the above-mentioned effects while suppressing the installation cost and the labor for maintenance management.

(2) Second Embodiment The elevator governor 40 (hereinafter referred to as the governor 40) according to the second embodiment of the present invention is the same as the elevator governor 8 according to the first embodiment. The differences will be mainly explained.

The speed governor 40 according to the second embodiment can be mounted in place of the speed governor 8 in the elevator 1 described with reference to FIG. 1 in the first embodiment. Further, when the detailed configuration of the speed governor 40 according to the second embodiment is compared with the speed governor 8 according to the first embodiment shown in FIG. 2, the difference is included in the internal configuration of the shoe mechanism. It is limited to the location of the tension adjustment unit. Therefore, it is assumed that FIG. 2 is diverted for the common part, and the repetition of the description will be omitted.

FIG. 5 is a detailed configuration diagram of the shoe mechanism of the elevator speed governor according to the second embodiment. The state of the speed governor 40 shown in FIG. 5 is a state immediately after the support lock state of the catch weight 27 is released in the governor rope gripping operation.

As shown in FIG. 5, the shoe mechanism 41 of the speed governor 40 includes a hook 25, a backing plate 26, a catch weight 27, a grip spring 28, a catch weight receiver 29, a tension adjusting portion 42, and the like. To. Similar to the first embodiment, the backing plate 26 and the catch weight 27 are collectively referred to as a governor rope gripping portion as a member capable of gripping the governor rope 11.

The tension adjusting portion 42 is arranged between the backing plate 26 and the housing 14 below the backing plate 26, and has an elastic body that can be displaced in the moving direction of the backing plate 26 (downward in FIG. 5) during the governor rope gripping operation. It is composed of.

In other words, in the first embodiment (governor 8), the tension adjusting portion 30 is arranged on the side of the element (catchweight 27) connected to the gripping spring 28 in the governor rope gripping portion. In the second embodiment (governor 40), the tension adjusting portion 42 is arranged on the side of the governor rope gripping portion that is not connected to the gripping spring 28 (backing plate 26).

The structure of the tension adjusting unit 42 itself may be considered to be the same as that of the tension adjusting unit 30 of the first embodiment. Therefore, in FIG. 5, a coil spring is shown as an example of the elastic body of the tension adjusting unit 42, but the elastic body of the tension adjusting unit 42 in the present embodiment is not limited to this, and a leaf spring or a damper. It may be an elastic body such as. Further, the elastic force required for the elastic body of the tension adjusting unit 42 is the same as that of the tension adjusting unit 30.

Then, in the speed governor 40, by arranging the tension adjusting portion 42 as described above, the backing plate 26 can be displaced in the vertical direction when a force is applied. On the other hand, the catchweight receiver 29 is fixed to the housing 14.

Since the configurations of the shoe mechanism 41 other than the above are the same as the configurations of the shoe mechanism 24 shown in the first embodiment, the same reference numerals are given and the description thereof will be omitted.

Among the operations by the speed governor 40 configured as described above, the "normal operation" in the case where the ascending / descending speed of the car 4 reaches the first overspeed, and the ascending / descending speed of the car 4 determine the rated speed. The "power cutoff operation" when it is detected that the first overspeed is reached is the same as that of the first embodiment.

Hereinafter, in the second embodiment, the “governor rope gripping operation” performed by the speed governor 40 when it is detected that the ascending / descending speed of the car 4 has reached the second overspeed will be described. However, the operation from when the descending speed of the car 4 reaches the second overspeed until the ratchet 22 starts rotating and the support lock state of the catchweight 27 is released is the same as that of the first embodiment. Therefore, the description thereof will be omitted.

As described above, FIG. 5 is a diagram showing a state of the speed governor after gripping the governor rope in the governor rope gripping operation of the second embodiment. Further, FIG. 6 is a diagram showing a state of the speed governor after gripping the governor rope in the governor rope gripping operation of the second embodiment.

In the governor rope gripping operation by the speed governor 40, when the support lock state is released, the catch weight 27 starts falling around the rotation shaft on the spring seat 32 side. Due to this fall, the free end of the catchweight 27 approaches the backing plate 26 (see FIG. 5).

After that, as shown in FIG. 6, when the catchweight 27 falls to a position facing the backing plate 26, the governor rope gripping portions (catchweight 27 and the backing plate 26) face each other and sandwich the governor rope 11. At this time, since the catch weight 27 is urged in the direction of the backing plate 26 by the gripping spring 28, the governor rope 11 can be sandwiched between the catch weight 27 and the backing plate 26 for braking. Then, when the car 4 continues to descend after the movement of the governor rope 11 is stopped, the operating lever 13 connected to the governor rope 11 is relatively pulled up, so that the emergency brake 12 is activated and the car 4 is mechanically operated. Emergency stop.

Further, by gripping the governor rope 11, a force is applied to the governor rope gripping portion (catch weight 27 and the backing plate 26) in the traveling direction (for example, downward direction) before gripping the governor rope 11. In the governor rope gripping operation of the second embodiment, when the catch weight 27 that has fallen after the support lock state is released comes into contact with the catch weight receiver 29 fixed to the housing 14, it does not move any further, but instead The backing plate 26 connected to the tension adjusting portion 42 is configured to be able to sink downward. Therefore, the force in the traveling direction (lower side) of the governor rope 11 generated in the governor rope grip portion due to the grip is transmitted to the tension adjusting portion 42 via the backing plate 26. As a result, the elastic body of the tension adjusting portion 42 is compressed, and the tension adjusting portion 42 slides in the traveling direction (downward in FIG. 6) together with the backing plate 26 and sinks (the white arrow in FIG. 6 is shown. reference).

As described above, since the sinking occurs when the governor rope 11 is gripped, the tension adjusting unit 42 can alleviate the sudden deceleration of the governor rope 11 on the gripped side. As a result, the tension difference on both sides of the governor rope 11 hung on the governor pulley 9 is reduced, so that the governor rope 11 on the side opposite to the gripping side jumps up or falls off on the circumference of the governor pulley 9 due to inertial force. Can be prevented. That is, the governor 40 according to the second embodiment can obtain the same effect as the governor 8 according to the first embodiment.

As described above, the speed controller 40 according to the second embodiment has an endless governor rope 11 that is hung on the governor pulley 9 and circulates and moves with the ascending / descending operation of the car 4, and the elevating speed of the car. When the movable shoe member (catch weight 27) approaches the fixed shoe member (backing plate 26) when the predetermined overspeed (second overspeed) is reached, the governor rope 11 hung on the governor pulley 9 is operated. A governor rope gripping portion (retaining plate 26 and catch weight 27) that holds one side (for example, the left side) between a movable shoe member and a fixed shoe member for braking, and a governor rope grip that is slidable in the traveling direction of the governor rope 11. It is configured to include a tension adjusting portion 42 that displaces a part of the members of the governor rope gripping portion in the traveling direction by an elastic body when the portion sandwiches the governor rope 11. According to the speed governor 40 configured in this way, the governor rope gripping portion is not a lock structure completely fixed to the housing 14, but the governor rope 11 before being gripped by the slide of the tension adjusting portion 42 during the governor rope gripping operation. Since the structure is displaceable in the traveling direction, not only can the governor rope 11 be braked in an emergency, but also the sudden deceleration of the governor rope 11 at the gripping portion can be alleviated. As a result, the speed governor 40 can suppress the change in tension of the governor rope 11 (increase in the tension difference between the governor rope 11 on both sides of the governor pulley 9) due to a sudden increase in the gripping force with respect to the governor rope 11, and the governor rope can be suppressed. It is possible to prevent the eleven from jumping up or falling off. In the second embodiment, the tension adjusting portion 42 is arranged between the backing plate 26 and the housing 14. Further, as in the first embodiment, the gripping spring 28 is arranged connected to the catch weight 27 as a member for urging the movable shoe member in the direction of the fixed shoe member by elastic force when the governor rope 11 is pinched. To.

Further, the tension adjusting unit 42, which is mentioned as a characteristic configuration of the speed governor 40 according to the second embodiment, can be realized by a simple configuration using an elastic body. Further, the configuration of the governor rope gripping portion is to grip one side of the governor rope as in the conventional general elevator speed governor, and the maintenance management thereof does not require any particular difficulty. Therefore, the speed governor 40 according to the second embodiment can obtain the above-mentioned effects while suppressing the installation cost and the labor for maintenance management. Further, as compared with the first embodiment, the tension adjusting portion 42 is arranged below the backing plate 26 on the outside of the governor rope 11 while avoiding the inside of the governor rope 11 (near the governor pulley 9) on which many constituent members are arranged. There is also the advantage of being able to do it.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

For example, in each of the above embodiments, the elevator speed governors 8 and 40 have been described based on the configuration of the pendulum type speed governor, but the method of the elevator speed governor of the present invention is not limited to this. However, it can also be applied to, for example, a ball-type speed governor.

1 Elevator 2 Traction sheave 3 Main rope 4 Riding car 5 Balance weight 6, 7 Guide rail 8 Elevator speed governor (speed governor)
9 Governor pulley 10 Tension pulley 11 Governor rope 12 Emergency brake 13 Actuating lever 14 Housing 15 Support shaft 16 Arm 16a Arm 17, 18 Pendulum 17a, 17b, 18a, 18b End 18c Claw 17d, 18d Detection contact 19, 20, 31 Rotating shaft 21 Speed adjustment spring 22 Ratchet 22a Tooth part 22b Ratchet pin 23 Overspeed switch 24 Shoe mechanism 25 Hook 25a Arm part 25b Hook part 26 Support plate 27 Catch weight 27a Catch weight pin 28 Grip spring 29 Catch weight receiver 30 Tension adjustment unit 32 Spring seat 33 Fixed plate 40 Elevator speed governor (speed control machine)
41 Shoe mechanism 42 Tension adjustment unit

Claims (5)

It is an elevator governor that monitors the ascending / descending speed of the elevator car.
An endless governor rope that is hung on a pulley and circulates as the car moves up and down.
When the ascending / descending speed of the car reaches a predetermined overspeed, the movable shoe member operates to approach the fixed shoe member, and one side of the governor rope hung on the pulley is set to the movable shoe member and the fixed shoe member. The governor rope gripping part that is sandwiched between and brakes,
A tension adjusting portion that is configured to be slidable in the traveling direction of the governor rope and that displaces a part of the members of the governor rope gripping portion in the traveling direction by an elastic body when the governor rope grip portion sandwiches the governor rope.
Elevator governor characterized by being equipped with. The elevator speed control device according to claim 1, wherein the tension adjusting unit is arranged at a destination where the movable shoe member moves when the governor rope is sandwiched. The elevator speed governor according to claim 1, wherein the tension adjusting unit is arranged between the fixed shoe member and a housing. Claim 1 is further provided with a gripping spring which is connected to the movable shoe member and urges the movable shoe member in the direction of the fixed shoe member by an elastic force when the governor rope is sandwiched. Elevator speed governor described in. The elevator speed governor according to claim 1, wherein the elastic body is a compression spring.

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