Speed governor and elevator

Abstract

To provide a speed governor and an elevator that facilitate adjustment work.SOLUTION: A speed governor 13 includes a speed governor rope 15, an upper pulley, a lower pulley 14, a tension weight 21, a support member 23, and a lifting mechanism 30. The lifting mechanism 30 includes a reaction force receiving portion 32 and a lifting rod 31. The reaction force receiving portion 32 is fixed to the tension weight 21. The lifting rod 31 is supported by the reaction force receiving portion 32 so as to be movable in a vertical direction, and one end part of the lifting rod, in an axial direction, is disposed to face a floor surface of the pit 101. In the reaction force receiving portion 32, the lifting rod 31 abuts on the floor surface of the pit 101, and the reaction force received by the lifting rod 31 from the floor surface is transmitted to the tension weight 21.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a speed governor and an elevator.

Background Art

[0002] Conventionally, an elevator includes a car, a counterweight, a rope connecting the car and the counterweight, and a hoist for winding the rope. Further, the elevator is provided with a speed governor for constantly monitoring the ascending / descending speed of the car and operating an emergency stop device provided on the car that has reached a speed equal to or higher than a predetermined speed.

[0003] In addition, since the speed governor rope constituting the speed governor stretches due to aging deterioration or the like, it is necessary to periodically adjust the position of the lower pulley constituting the speed governor, the length of the speed governor rope, and the like. As such a technique, for example, there is one described in Patent Document 1.

[0004] Patent Document 1 describes a technique in which a belt-shaped holder is interposed between a rail bracket and a weight, and while an operator lifts the weight with one hand, the free end of the adjustment belt of the holder is pulled with the other hand to shorten the fixed end side of the adjustment belt. And Patent Document 1 describes that the adjustment belt is held by locking a cam buckle, and in this way, the weight is kept in a lifted state by the belt-shaped holder, and the inclination of the weight is adjusted by moving the bracket or shortening the governor rope.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the technology described in Patent Document 1, when adjusting the position of the lower pulley of the speed governor or the length of the speed governor rope, the tension weight was lifted using a holding belt. Therefore, in the technology described in Patent Document 1, operations such as transporting the holding belt into and out of the hoistway and installing the holding belt on the tension weight were required, making the adjustment work extremely complicated.

[0007] An object of the present invention is to provide a speed governor and an elevator that can easily perform adjustment work in consideration of the above problems.

Means for Solving the Problems

[0008] To solve the above problems and achieve the object, the speed governor is a speed governor that monitors the ascending and descending speed of the hoisting body of the elevator. The speed governor includes a speed governor rope, an upper pulley, a lower pulley, a tension weight, a support member, and a lifting mechanism. The speed governor rope is connected to the hoisting body via a connecting portion and circulates in accordance with the ascending and descending movement of the hoisting body. The speed governor rope is wound around the upper pulley. The lower pulley is disposed below the upper pulley in the vertical direction, and the speed governor rope is wound around it. The tension weight applies tension to the speed governor rope via the lower pulley. The support member supports the lower pulley and the tension weight. The lifting mechanism is provided on the tension weight. Further, the lifting mechanism has a reaction force receiving portion and a lifting rod. The reaction force receiving portion is fixed to the tension weight. The lifting rod is supported by the reaction force receiving portion so as to be movable in the vertical direction, and one end portion in the axial direction is disposed to face the floor surface of the pit of the hoistway. Then, the reaction force receiving portion transmits the reaction force received by the lifting rod from the floor surface to the tension weight when the lifting rod abuts against the floor surface of the pit.

[0009] In addition, the elevator includes a hoisting body that moves up and down in the hoistway and a speed governor that monitors the ascending and descending speed of the hoisting body. Further, as the speed governor, the above-described speed governor is used.

Effects of the Invention

[0010] According to the speed governor and elevator with the above configuration, adjustment work can be easily performed.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0012] Hereinafter, exemplary embodiments of the speed governor and the elevator will be described with reference to FIGS. 1 to 4B. In each figure, common members are denoted by the same reference numerals.

[0013] 1. First Exemplary Embodiment 1-1. Configuration of the Elevator First, the configuration of the elevator according to the first exemplary embodiment (hereinafter referred to as "this example") will be described with reference to FIG. 1. FIG. 1 is a schematic configuration diagram showing the elevator.

[0014] The elevator 1 of this example is provided in a hoistway 100 formed in a building structure. As shown in FIG. 1, the elevator 1 of this example is a so-called 1:1 roping elevator. The elevator 1 includes a car 2 that is an example of a lifting body for carrying people and goods, a main rope 3, a counterweight 4, and a hoisting machine 5. Further, the elevator 1 includes an emergency stop device 10 and a speed governor 13.

[0015] In the machine room 102 provided at the top of the hoistway 100, a hoisting machine 5 is installed. A main rope 3 is wound around the drum of the hoisting machine 5. Further, in the vicinity of the hoisting machine 5, a deflecting pulley 6 on which the main rope 3 is mounted is provided.

[0016] One end of the main rope 3 is connected to the upper part of the car 2, and the other end of the main rope 3 is connected to the upper part of the counterweight 4. By driving the hoisting machine 5, the car 2 and the counterweight 4 move up and down in the hoistway. Hereinafter, the direction in which the car 2 and the counterweight 4 move up and down is defined as the vertical direction.

[0017] The car 2 is slidably supported by two guide rails 7, 7 via a guide device. Similarly, the counterweight 4 is slidably supported by a weight-side guide rail 8 via a guide device. The guide rail 7 and the weight-side guide rail 8 extend along the vertical direction in the hoistway 100.

[0018] Further, two emergency stop devices 10 for emergently stopping the up and down movement of the car 2 are provided at the lower part of the car 2. The emergency stop devices 10 are arranged at positions facing the guide rail 7 at the lower part of the car 2.

[0019] The speed governor 13 has an upper pulley 12 and a lower pulley 14. The upper pulley 12 is installed in the machine room 102. A speed detection mechanism (not shown) is provided on the upper pulley 12. The lower pulley 14 is installed in a pit 101 which is the lower part of the hoistway 100. Further, the lower pulley 14 is arranged vertically below the upper pulley 12. A governor rope 15 is wound around the upper pulley 12 and the lower pulley 14. A tension weight 21 (see FIG. 2) is attached to the lower pulley 14. Therefore, a predetermined load is applied to the lower pulley 14 downward in the vertical direction by the tension weight 21. And a predetermined tension is applied to the governor rope 15 wound around the lower pulley 14 via the lower pulley 14.

[0020] The speed governor rope 15 is formed in a so-called endless shape with both axial ends connected. A connecting portion 16 is provided on the speed governor rope 15. The connecting portion 16 is connected to the emergency stop device 10 provided on the car 2. Then, the speed governor rope 15 circulates between the upper pulley 12 and the lower pulley 14 in accordance with the ascending and descending movements of the car 2. And the upper pulley 12 detects the ascending and descending speed of the car 2 from the circulating speed of the speed governor rope 15.

[0021] 1-2. Configuration around the lower pulley of the speed governor Next, the configuration around the lower pulley 14 of the speed governor 13 will be described with reference to FIG. 2. FIG. 2 is a front view showing the lower pulley 14. As shown in FIG. 2, the speed governor 13 has a lower pulley 14, a tension weight 21, a support arm 23 serving as a support member, a fixed bracket 25, a cover 27, and a lifting mechanism 30. The speed governor 13 according to the first embodiment is a speed governor having a so-called cantilever support structure.

[0022] The fixed bracket 25 is fixed to a support column 41 erected from the pit 101. In this example, an example of fixing the fixed bracket 25 to the support column 41 has been described, but it is not limited thereto. For example, the fixed bracket 25 may be fixed to the guide rail 7 or the weight side guide rail 8.

[0023] A support arm 23 is provided at an end of the fixed bracket 25 opposite to the support column 41. One end portion in the longitudinal direction of the support arm 23 is swingably supported by the fixed bracket 25 via a swing shaft 24. A tension weight 21 is fixed to the other end portion in the longitudinal direction of the support arm 23. Also, a lower pulley 14 is rotatably supported via a rotation shaft 22 at an intermediate portion in the longitudinal direction of the support arm 23. And by applying a load downward in the vertical direction to the other end portion of the support arm 23 by the tension weight 21, a predetermined tension is applied to the speed governor rope 15 wound around the lower pulley 14.

[0024] Also, a sensor bracket 28 is fixed to the longitudinal middle part of the support arm 23. The sensor bracket 28 protrudes downward in the vertical direction from the support arm 23. A sensor 26 is installed at the lower end part of the sensor bracket 28 in the vertical direction. The sensor 26 detects the distance to the floor surface of the pit 101. Note that the sensor 26 may not be provided on the governor 13.

[0025] Also, a cover 27 is installed above the lower pulley 14 in the vertical direction. The cover 27 is fixed to the support arm 23 or the fixed bracket 25. By this cover 27, it is possible to prevent a falling object from above the hoistway 100 from contacting the lower pulley 14. Further, an insertion hole through which the governor rope 15 wound around the lower pulley 14 is inserted is formed in the cover 27.

[0026] The tension weight 21 is provided with a lifting mechanism 30. The lifting mechanism 30 has a lifting rod 31 and a plurality of nuts 32 showing an example of a reaction force receiving part. The plurality of nuts 32 are fixed to the tension weight 21 by a fixing method such as welding, for example. Further, the plurality of nuts 32 are fixed to an end part of the tension weight 21 on the side opposite to the support arm 23. Furthermore, the plurality of nuts 32 are arranged at intervals in the vertical direction.

[0027] The lifting rod 31 is inserted into the plurality of nuts 32. The lifting rod 31 is formed of a rod-shaped member. A male thread is formed on the outer peripheral surface of the lifting rod 31. And the lifting rod 31 is screwed into the plurality of nuts 32 and is supported by the plurality of nuts 32 so as to be movable in the vertical direction. Also, one end part of the lifting rod 31 in the axial direction is arranged to face the floor surface of the pit 101. A groove into which a jig such as a driver can be inserted is formed at the other end part of the lifting rod 31 in the axial direction. The lifting rod 31 moves in the vertical direction along the plurality of nuts 32 by being operated by a jig.

[0028] 1-3. Adjustment Operation of Lower Pulley Next, the operation of the adjustment work of the lower pulley 14 in the speed governor 13 having the above-described configuration will be described with reference to FIG. 3. FIG. 3 is a diagram showing the adjustment work of the lower pulley.

[0029] First, the operator inserts a jig such as a driver into the groove provided at the other end in the axial direction of the lifting rod 31, that is, the upper end in the vertical direction. Next, the jig is operated to rotate the lifting rod 31 around the axial direction. As described above, the lifting rod 31 is screwed into a plurality of nuts 32. Therefore, the lifting rod 31 is supported by the plurality of nuts 32 and moves downward in the vertical direction.

[0030] As shown in FIG. 3, by rotating the lifting rod 31, the lower end of the lifting rod 31 abuts on the floor surface of the pit 101. In this state, when the lifting rod 31 is further rotated, the lifting rod 31 receives a reaction force directed upward in the vertical direction from the floor surface of the pit 101. The reaction force applied to the lifting rod 31 is transmitted to the plurality of nuts 32 screwed to the lifting rod 31. Then, the plurality of nuts 32 transmit the reaction force directed upward in the vertical direction from the lifting rod 31 to the tension weight 21. As a result, the tension weight 21 is lifted upward in the vertical direction via the plurality of nuts 32.

[0031] Then, by lifting the tension weight 21, the tension of the governor rope 15 applied to the lower pulley 14 is reduced. As a result, adjustment operations such as the attachment position of the fixing bracket 25 to the support column 41 and the shortening of the governor rope 15 can be easily performed. Further, according to the governor 13 of this example, a lifting mechanism 30 is installed in the tension weight 21 in advance. Therefore, it is possible to omit the operations of transporting and installing various members such as a holding belt and a jack base into the pit 101 to lift the tension weight 21. As a result, according to the governor 13 of this example, the tension weight 21 can be easily lifted by the lifting mechanism 30, and the adjustment work for the lower pulley 14 can be easily performed.

[0032] Further, the lifting rod 31 and the plurality of nuts 32 indicating the lifting mechanism 30 are installed at the end of the tension weight 21 on the side opposite to the support arm 23. That is, the lifting rod 31 and the plurality of nuts 32 are arranged at a position farther from the swing shaft 24 that supports the tension weight 21 than the lower pulley 14. Thereby, the force for lifting the tension weight 21 can be reduced compared to the case where the lifting mechanism 30 is installed in the vicinity of the swing shaft 24, and the adjustment work for the lower pulley 14 can be easily performed.

[0033] 2. Second Embodiment Example Next, a governor according to a second embodiment example will be described with reference to FIGS. 4A and 4B. FIGS. 4A and 4B are diagrams showing the configuration around the lower pulley of the governor according to the second embodiment example.

[0034] The governor according to this second embodiment example is a governor having a both-side support structure that supports the tension weight with two guide rails. Therefore, the same reference numerals are given to the parts common to the governor 13 according to the first embodiment example, and the overlapping description is omitted.

[0035] As shown in FIGS. 4A and 4B, the governor 50 includes a lower pulley 14B, a tension weight 51, a rotating shaft 52, a frame 53 serving as a support member, a fixed bracket 55, weight guide rails 61, 61, and a lifting mechanism 70.

[0036] One longitudinal end of the fixed bracket 55 is fixed to the guide rail 7. Further, two fixed brackets 55 are fixed to the guide rail 7 at intervals in the vertical direction. Although an example of fixing the fixed bracket 55 to the guide rail 7 has been described, it is not limited thereto. For example, the fixed bracket 55 may be fixed to the weight side guide rail 8 or a support column erected from the pit 101.

[0037] A pair of weight guide rails 61 are fixed to the end of the fixed bracket 55 on the side opposite to the guide rail 7. The pair of weight guide rails 61 are supported at their upper and lower ends in the vertical direction by two fixed brackets 55. And the pair of weight guide rails 61 are arranged such that their longitudinal direction is parallel to the vertical direction, similar to the guide rail 7. Also, the pair of weight guide rails 61 are arranged at intervals in the width direction which is a direction orthogonal to the vertical direction.

[0038] The pair of weight guide rails 61 support the frame 53 so as to be movable along the vertical direction. The frame 53 is disposed between the pair of weight guide rails 61. A tension weight 51 is installed at the lower part of the frame 53 in the vertical direction. Also, at the upper part of the frame 53 in the vertical direction, the lower pulley 14B is rotatably supported via the rotating shaft 52.

[0039] Further, a lever 59 is provided at the upper end of the frame 53 in the vertical direction. The lever 59 protrudes from the frame 53 toward the guide rail 7. A sensor 56 is disposed at the tip of the lever 59. The sensor 56 is supported by a sensor bracket 58 fixed to the guide rail 7.

[0040] The tension weight 51 is provided with a lifting mechanism 70. The lifting mechanism 70 has two lifting rods 71 and a plurality of nuts 72 which are an example of a reaction force receiving part. The plurality of nuts 72 are fixed to the tension weight 51 by a fixing method such as welding. Also, the plurality of nuts 72 are arranged at intervals in the vertical direction. Further, the plurality of nuts 72 are arranged at intervals in the width direction.

[0041] The lifting rods 71 are inserted into the plurality of nuts 72 arranged at intervals along the vertical direction. The lifting rods 71 are formed of rod-shaped members. External threads are formed on the outer peripheral surface of the lifting rods 71. And the lifting rods 71 are screwed into the plurality of nuts 72 and are supported by the plurality of nuts 72 so as to be movable in the vertical direction. Also, one end portion of the lifting rod 71 in the axial direction is arranged to face the floor surface of the pit 101.

[0042] A groove into which a jig such as a driver can be inserted is formed at the other end portion of the lifting rod 71 in the axial direction. The lifting rod 71 moves in the vertical direction along the plurality of nuts 72 by being operated by a jig.

[0043] Also, when the lifting rod 71 is further rotated with the lower end portion of the lifting rod 71 in contact with the floor surface of the pit 101, the lifting rod 71 receives a reaction force directed upward in the vertical direction from the floor surface of the pit 101. The reaction force applied to the lifting rod 71 is transmitted to the plurality of nuts 72 screwed to the lifting rod 71. Thereby, the tension weight 51 is lifted upward in the vertical direction via the plurality of nuts 72.

[0044] In the speed governor 50 according to the second embodiment example, an example in which two lifting rods 71 are provided has been described, but the present invention is not limited thereto. The number of the lifting rods 71 may be one, or three or more may be provided. In order to lift the tension weight 51 well-balanced along the weight guide rail 61, it is preferable to provide a plurality of lifting rods 71.

[0045] The other configurations are the same as those of the speed governor 13 according to the first embodiment, and thus their descriptions are omitted. The speed governor 50 according to this second embodiment can also achieve the same operational effects as the speed governor 13 according to the above-described first embodiment.

[0046] Note that the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the gist of the invention described in the claims.

[0047] In the above-described embodiment, as an example of the lifting mechanism, an example in which a lifting rod formed with a male screw and a nut into which the lifting rod is screwed as a reaction receiving part is applied has been described, but the present invention is not limited thereto. The reaction receiving part is not limited to a nut as long as it is a member that supports the lifting rod so as to be movable in the vertical direction and can transmit the reaction force received by the lifting rod to the tension weight.

[0048] The configuration of the elevator 1 is not limited to the 1:1 roping elevator shown in FIG. 1, and various other elevators such as a 2:1 roping elevator or a hydraulic elevator can be applied. Further, it is also applicable to a machine roomless elevator having no machine room in the hoistway.

[0049] In this specification, words such as "parallel" and "orthogonal" are used, but these do not mean only strict "parallel" and "orthogonal", and may be in a state of "substantially parallel" or "substantially orthogonal" that includes "parallel" and "orthogonal" and is within a range where their functions can be exerted.

Explanation of Reference Numerals

[0050] 1... elevator, 2... car (lifting body), 3... main rope, 4... counterweight, 5... hoisting machine, 7... guide rail, 8... counterweight side guide rail, 10... emergency stop device, 12... upper pulley, 13, 50... speed governor, 14, 14B... lower pulley, 15... speed governor rope, 16... connecting part, 21, 51... tension weight, 22, 52... rotating shaft, 23... support arm (support member), 24... swing shaft, 25, 55... fixed bracket, 30, 70... lifting mechanism, 31, 71... lifting rod, 32, 72... nut (reaction receiving part), 53... frame (support member), 61... weight guide rail, 100... hoistway, 101... pit, 102... machine room

Claims

1. In a speed governor for monitoring the lifting speed of an elevator car, a speed governor rope connected to the car via a connecting part and circulating in accordance with the lifting operation of the car; an upper pulley around which the speed governor rope is wound; a lower pulley arranged below the upper pulley in the vertical direction and around which the speed governor rope is wound; a tension weight for applying tension to the speed governor rope via the lower pulley; a support member for supporting the lower pulley and the tension weight; a lifting mechanism provided on the tension weight, wherein the lifting mechanism has a reaction force receiving part fixed to the tension weight, and a lifting rod movably supported in the vertical direction on the reaction force receiving part and having one axial end arranged to face the floor of the pit of the hoistway; the reaction force receiving part transmits the reaction force received by the lifting rod from the floor to the tension weight when the lifting rod abuts against the floor of the pit speed governor.

2. The reaction force receiving part is a nut fixed to the tension weight, and a male thread screwed into the nut is formed on the outer peripheral surface of the lifting rod The speed governor according to claim 1.

3. One axial end of the lifting rod is arranged to face the floor of the pit, and a groove into which a jig can be inserted is formed at the other axial end of the lifting rod The speed governor according to claim 2.

4. The support member is swingably supported via a swing shaft on a fixed bracket installed in the hoistway, the lower pulley is rotatably supported on the support member, the tension weight is fixed to an end of the support member opposite to the swing shaft, and the lifting mechanism is provided at an end of the tension weight opposite to the support member The speed governor according to claim 1.

5. A weight guide rail for supporting the support member movably in the vertical direction is provided, and a plurality of the lifting rods of the lifting mechanism are arranged The speed governor according to claim 1.

6. An elevator car moving up and down in a hoistway, and a speed governor for monitoring the lifting speed of the car, wherein the speed governor has a speed governor rope connected to the car via a connecting part and circulating in accordance with the lifting operation of the car, and an upper pulley around which the speed governor rope is wound, A lower pulley that is disposed below the upper pulley in the vertical direction and around which the governor rope is wound; A tension weight that applies tension to the governor rope via the lower pulley; A support member that supports the lower pulley and the tension weight; A lifting mechanism provided on the tension weight, and comprising: The lifting mechanism includes: A reaction force receiving portion fixed to the tension weight; A lifting rod that is supported by the reaction force receiving portion so as to be movable in the vertical direction, and one end portion in the axial direction is disposed to face the floor surface of the pit of the lifting path; The reaction force receiving portion transmits the reaction force received by the lifting rod from the floor surface to the tension weight when the lifting rod abuts against the floor surface of the pit; An elevator.

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