Elevator cars and elevators

Abstract

To provide an elevator car and an elevator capable of maintaining the accuracy of load detection and ensuring workability during maintenance work.SOLUTION: An on-car spring structure for a load sensor device comprises a spring unit having a plurality of springs stretchable between a pulley support and an upper frame, and a fall prevention member provided between the upper frame and the pulley support to allow movement of the pulley support toward the upper frame and to restrict movement of the pulley support away from the upper frame.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an elevator car and an elevator. [Background technology]

[0002] Conventionally, elevators equipped with a load sensor that detects the load of a car are known. Patent Document 1 discloses a configuration that detects the load of a car by measuring the displacement of a hitch spring and vibration isolating rubber provided on the upper frame side of the car frame that supports the car.

[0003] In Patent Document 1, the main rope supports the upper frame and bears all the load on the car. In this configuration, a hitch spring is attached to the end of the main rope that passes through and is fixed to the upper frame, and the load of the car is detected by measuring the displacement of the hitch spring.

[0004] In addition, in Patent Document 1, when the main rope is configured to bear the entire load applied to the car through a car sheave installed on the car, the car sheave frame that supports the car sheave is attached to the upper frame of the car frame through vibration-proof rubber. The load of the car is detected by measuring the deflection of the vibration-proof rubber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-220912 A Summary of the Invention [Problem to be solved by the invention]

[0006] In a high-speed elevator with a large load, the load inside the car is large and the ascent and descent stroke is high, so the mass of the tail cord and the compensating rope is also large. Furthermore, the weight of the elevator car itself is large, so the load on the elastic members such as springs and anti-vibration rubber attached to detect the load is large. Therefore, it is necessary to select elastic members that can withstand the load. For this reason, it is possible to configure the load detection device to withstand a large load by using a large spring as the elastic member or increasing the number of springs and anti-vibration rubbers.

[0007] However, since the space above the car is limited, it is difficult to use large springs. Also, if the number of springs is increased, it becomes difficult to position the springs during maintenance such as replacing the springs or the pulleys installed on the car, which reduces work efficiency.

[0008] On the other hand, anti-vibration rubber has a tendency to exhibit hysteresis in the load and displacement of the anti-vibration rubber, and is also susceptible to non-linearity and deterioration. For this reason, when anti-vibration rubber is used in a load detection device, it is difficult to obtain the same detection value every time, even when the same load is applied to the anti-vibration rubber.

[0009] Therefore, an object of the present invention is to provide an elevator car and an elevator that can maintain the accuracy of load detection and ensure workability during maintenance. [Means for solving the problem]

[0010] In order to solve the above problems and achieve the object of the present invention, the elevator car of the present invention comprises a car body for carrying passengers and baggage, an over-car pulley around which a main rope is wound at an upper portion of the car body, and a pair of pulley support parts provided at positions sandwiching the over-car pulley in a direction perpendicular to the rotation plane of the over-car pulley and rotatably supporting the over-car pulley. The car car also comprises a pair of upper frames supporting the car body, and an over-car spring structure arranged between the upper frames and the pulley support parts. The over-car spring structure comprises a spring unit having a plurality of springs arranged expandably between the pulley support parts and the upper frame, and a fall prevention member provided between the upper frame and the pulley support parts to allow movement of the pulley support parts in a direction approaching the upper frame and to restrict movement of the pulley support parts in a direction away from the upper frame.

[0011] The elevator of the present invention includes the above-described car. Effect of the Invention

[0012] According to the present invention, the accuracy of load detection can be maintained, and workability during maintenance can be ensured. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a configuration example of an elevator car according to a first embodiment of the present invention; [Diagram 2] FIG. 2A is a schematic diagram of the main parts including the car-mounted pulley 20 in the car 40 of this embodiment, viewed from the front, and FIG. 2B is a schematic diagram of the main parts including the car-mounted pulley 20 in the car 40, viewed from the side. [Diagram 3] 3A is an enlarged view of a portion of the spring unit 30 of this embodiment, FIG. 3B is a cross-sectional view taken along line aa in FIG. 3A, and FIG. 3C is a cross-sectional view taken along line bb in FIG. 3A. [Figure 4] 2 is an enlarged schematic diagram showing a fall prevention rod 31. FIG. [Diagram 5]Figure 5A is a schematic diagram of the main parts including the above-car pulley 20 in a car 40 according to the second embodiment of the present invention, viewed from the front, and Figure 5B is a schematic diagram of the main parts including the above-car pulley 20 in a car 40, viewed from the side. [Figure 6] 6A and 6B are schematic configuration diagrams of a car according to a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an example of an elevator car and an elevator according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the following example. In each of the drawings described below, the same reference numerals are used to denote common members.

[0015] First Embodiment 1. Elevator car configuration First, an elevator and a car according to a first embodiment of the present invention (hereinafter referred to as "this embodiment") will be described with reference to Fig. 1. Fig. 1 is a schematic diagram showing a configuration example of an elevator 1 of this embodiment.

[0016] As shown in Fig. 1, an elevator 1 of this embodiment is provided in a hoistway 2 formed in an architectural structure. The elevator 1 includes a car 40 that moves up and down in the hoistway 2 and carries people and luggage, and a main rope 13. In the following description, the direction in which the car 40 moves up and down is assumed to be the up and down direction.

[0017] [Elevator shaft] The elevator shaft 2 is a space for the elevator car 40 to ascend and descend, and is provided vertically penetrating each floor inside the building. A guide rail (not shown) that guides the elevator car 40 as it ascends and descends is attached to the inner wall surface of the elevator shaft 2. In addition, landing doors (not shown) leading to each floor are provided on the wall surface of the elevator shaft 2 at height positions corresponding to each floor.

[0018] [Car] The car 40 is connected to a counterweight (not shown) via the main rope 13, and moves up and down within the hoistway 2. The car 40 is guided by a guide rail (not shown) provided on the wall surface within the hoistway 2, and moves up and down within the hoistway 2. As will be described later, a car door 4 is provided on the front side of the car body 3 of the car 40 at a position corresponding to the landing door, and when the car stops at each floor, the car door 4 and the landing door open, allowing people and baggage to get on and off the car 40. The car 40 will be described in detail later.

[0019] [Main rope] The main rope 13 has a middle portion wound around an upper pulley 20 (see FIG. 2A) of the car 40, and is connected to a hoist and a counterweight (not shown). The main rope 13 is wound up by the hoist (not shown), causing the car 40 to ascend and descend.

[0020] 2. Car Next, the car 40 of this embodiment will be described. The car 40 of this embodiment includes a car body 3, a car frame 5, a pulley support portion 22, and an upper-car pulley 20. The car 40 also includes an upper-car spring structure 24 and a load sensor device 27. In the following description, the ascending and descending direction of the car 40 is defined as the up-down direction, the horizontal direction of the car 40 that is perpendicular to the rotation axis of the upper-car pulley 20 is defined as the left-right direction, and the direction along the rotation axis of the upper-car pulley 20 is defined as the front-rear direction.

[0021] FIG. 2A is a schematic diagram of the main parts including the car-mounted pulley 20 in the car 40 of this embodiment as viewed from the front, and FIG. 2B is a schematic diagram of the main parts including the car-mounted pulley 20 in the car 40 as viewed from the side.

[0022] [Basket body] The car body 3 is formed in a hollow, generally rectangular parallelepiped shape, and is composed of a car floor 9, a ceiling, and a side wall provided between the car floor 9 and the ceiling, as shown in Fig. 1. A car door 4 is provided on the front surface of the car body 3 facing the landing door of the elevator shaft 2.

[0023] [Basket frame] The car frame 5 is composed of an upper frame 6, a lower frame 8, and a vertical frame 7, and supports the car body 3 inside the car frame 5. The lower frame 8 is disposed below the passenger car 40 in the up-down direction, and supports a compensating bracket 14. A tail cord beam 15 and a compensating suspension plate 16 are fixed to this compensating bracket 14. A tail cord 18 is fixed to this tail cord beam 15, and a compensating rope 17 is suspended from the compensating suspension plate 16. An underfloor base 11 is provided on the passenger car 40 side of the lower frame 8. A plurality of under-car vibration isolating rubbers 10 are arranged between this underfloor base 11 and the car floor 9. The under-car vibration isolating rubbers 10 are made of an elastic member having a predetermined spring constant.

[0024] The vertical frame 7 is composed of members extending in the lifting direction, and is provided on both side surfaces adjacent to the side surface on which the car door 4 of the car 40 is provided. The vertical frame 7 is connected to the upper frame 6 and the lower frame 8, and guide rollers 12 that slide on guide rails in the elevator shaft 2 are provided on both ends in the vertical direction sandwiching the car 40.

[0025] The upper frame 6 is disposed on the upper side of the car 40 in the vertical direction, and is formed of a beam-like member extending in the left-right direction of the car pulley 20 described later in a direction perpendicular to the vertical direction, and is fixed between two opposing vertical frames 7, 7. In this embodiment, as shown in FIG. 2B, a pair of upper frames 6 are provided to sandwich the upper end of the car pulley 20 in the front-rear direction of the car pulley 20. The upper frame 6 is formed of a member having a U-shaped cross section, with both ends in the vertical direction having an upper bent portion 6a and a lower bent portion 6b bent at a right angle to the side opposite to the side where the car pulley 20 is disposed. The lower surface of the lower bent portion 6b on the pulley support portion 22 side at the lower part in the vertical direction of the upper frame 6 becomes the mounting surface of the spring unit 30 described later.

[0026] Furthermore, in the front-rear direction of the upper car pulley 20, on the opposite side of the upper car pulley 20 from the mounting position of the spring unit 30 of the lower bent portion 6b of the upper frame 6, a plurality of upper through holes (not shown) are provided along the left-right direction perpendicular to the up-down direction of the upper frame 6. These upper through holes are holes through which fall prevention rods 31 (corresponding to fall prevention members of the present invention) described later are inserted.

[0027] A pair of upper inter-frame brackets 25, 25 connecting the pair of upper frames 6, 6 are fixed by bolts (not shown) to both end faces in the left-right direction perpendicular to the up-down direction of each upper frame 6. The upper inter-frame bracket 25 is configured as a box-shaped member consisting of a rectangular main surface portion 25a extending in the rotational axis direction of the above-car pulley 20 and side surfaces 25b provided so as to surround the four sides of the main surface portion 25a. The upper inter-frame bracket 25 is fixed between the pair of upper frames 6, 6 by fixing the side surfaces 25b facing each other in the rotational axis direction of the above-car pulley 20 to the pair of upper frames 6, 6 by bolting or the like.

[0028] Further, the side surface portion 25b of the upper inter-frame bracket 25 facing the car 40 side is used as an attachment piece for a detection plate 28 of a load sensor device 27 described later. In this embodiment, the upper inter-frame bracket 25 is made up of a box-shaped member composed of a main surface portion 25a and a side surface portion 25b provided so as to surround the main surface portion 25a, so that the upper inter-frame bracket 25 can maintain the rigidity and strength required for the upper inter-frame bracket 25.

[0029] The upper inter-frame bracket 25 can be modified in various ways in shape as long as it can be fixed between the pair of upper frames 6, 6 and is a member capable of fixing the detection plate 28 of the load sensor device 27. By configuring the upper inter-frame bracket 25 from a box-shaped member as in this embodiment, it is possible to maintain rigidity and strength while reducing the weight of the upper inter-frame bracket 25.

[0030] [Cage top pulley] The car pulley 20 is a cylindrical member around which the main rope 13 is wound, and is provided on the upper surface side in the vertical direction of the car body 3. The car pulley 20 is rotatably supported by a pulley support part 22 (described later) via a pulley shaft 20a provided in the center of the rotation surface. In the following description, the vertical direction and the direction perpendicular to the rotation axis direction of the car pulley 20 are defined as the left-right direction.

[0031] [Pulley support part] The pulley support portion 22 is configured with a plate-like member longer than the diameter of the car pulley 20. In this embodiment, a pair of pulley support portions 22 are provided to sandwich the car pulley 20 in a direction along the rotation axis of the car pulley 20. The pulley support portion 22 is configured with a member having a U-shaped cross section, with both ends in the up-down direction having an upper bent portion 22a and a lower bent portion 22b bent at a right angle to the side opposite to the side where the car pulley 20 is arranged. The upper surface of the upper bent portion 22a on the upper frame 6 side becomes the mounting surface for the spring unit 30 described later.

[0032] A pulley shaft 20a is supported between a pair of pulley supports 22 arranged on either side of the car pulley 20, and the car pulley 20 is rotatably supported by this pulley shaft 20a. A pair of pulley support brackets 23, 23 connecting the pair of pulley supports 22 are fixed to both end faces in the left-right direction perpendicular to the up-down direction of each pulley support 22 by bolts (not shown).

[0033] The bracket 23 between pulley support parts is made up of a box-shaped member including a rectangular main surface part 23a extending in the direction of the rotation axis of the above-car pulley 20 and side surfaces 23b erected from the main surface part 23a so as to surround the four sides of the main surface part 23a. The bracket 23 between pulley support parts is fixed between the pulley support parts 22 by fixing the side surfaces 23b, which are provided facing each other in the direction of the rotation axis of the above-car pulley 20, to the pulley support parts 22 by bolting or the like.

[0034] Moreover, of the multiple side surface portions 23b, the side surface portion 23b facing the upper frame 6 is used as an attachment piece for a sensor portion 26 of a load sensor device 27 described later. In this embodiment, similar to the upper frame bracket 25, the pulley support portion bracket 23 is made up of a box-shaped member composed of a main surface portion 23a and side surface portions 23b provided so as to surround the main surface portion 23a, so that the pulley support portion bracket 23 can maintain the rigidity and strength required for the pulley support portion bracket 23.

[0035] The shape of the pulley support bracket 23 can be modified in various ways as long as it can be fixed between the pair of pulley supports 22 and can fix the sensor unit 26 of the load sensor device 27. By configuring the pulley support bracket 23 from a box-shaped member as in this embodiment, it is possible to maintain rigidity and strength while reducing the weight of the pulley support bracket 23. The pair of pulley supports 22 that are provided to sandwich the car pulley 20 are integrally configured by the pulley support bracket 23.

[0036] 2B, the pulley support part 22 has bent parts 22a, 22b at both ends in the up-down direction of the pulley support part 22 bent at a right angle to the side opposite to the side where the above-car pulley 20 is disposed. On one surface side (one side) and the other surface side (the other side) sandwiching the rotation surface of the above-car pulley 20, an above-car spring structure 24 is disposed between the upper bent part 22a of the pulley support part 22 and the lower bent part 6b of the upper frame 6 in the up-down direction.

[0037] [Spring structure above the cage] The car spring structure 24 is composed of a plurality of (eight in this embodiment) spring units 30 and a plurality of (four in this embodiment) fall prevention rods 31. In this embodiment, four spring units 30 are installed on each side of the car pulley 20 in the direction along the rotation axis thereof.

[0038] Fig. 3A is an enlarged view of a portion of the spring unit 30 of this embodiment, Fig. 3B is a cross-sectional view taken along line aa in Fig. 3A, and Fig. 3C is a cross-sectional view taken along line bb in Fig. 3A. As shown in Fig. 3A, each spring unit 30 is composed of an upper fixing plate 33, a lower fixing plate 34, and a plurality of springs 35 (three in this embodiment).

[0039] The upper fixed plate 33 is composed of a rectangular plate-like member on which spring seats 36 corresponding to the three springs 35 can be arranged. The upper fixed plate 33 is fixed by bolts 37 to the lower surface of the lower bent portion 6b of the upper frame 6 via the spring seats 36. Three spring seats 36 are arranged on the upper fixed plate 33 along the extension direction of the upper frame 6, and the three spring seats 36 are each fixed by a bolt 37.

[0040] The lower fixed plate 34 is formed of a rectangular plate-like member on which spring seats 38 corresponding to the three springs 35 can be arranged. The lower fixed plate 34 is configured such that the length of the lower fixed plate 34 in a direction perpendicular to the arrangement direction of the spring seats 38 and parallel to the direction along the rotation axis of the upper cage pulley 20 is longer than that of the upper fixed plate 33. The lower fixed plate 34 is disposed on the upper surface of the upper bent portion 22a of the pulley support portion 22 facing the upper frame 6, facing the upper fixed plate 33. The lower fixed plate 34 is fixed by bolts 39 from the upper frame 6 side via the spring seats 38. Three spring seats 38 are arranged on the lower fixed plate 34 at positions facing the spring seats 36 fixed to the upper fixed plate 33, and each is fixed by a bolt 39.

[0041] In addition, the lower fixed plate 34 is provided with a plurality of lower through holes 49, through which the fall prevention rods 31 described later are inserted, in parallel with the direction in which the spring seat 38 is installed. In this embodiment, the lower through holes 49 are formed at the end of the lower fixed plate 34 opposite the car upper pulley side in the front-rear direction. Therefore, when the lower fixed plate 34 is placed on the pulley support part 22, the lower through holes 49 protrude from the end opposite the car upper pulley 20 side from the upper bent part 22a of the pulley support part 22. In addition, the lower through holes 49 provided in the lower fixed plate 34 overlap with the upper through holes provided in the lower bent part 6b of the upper frame 6 described above in the up-down direction.

[0042] Each of the springs 35 is made of a metal wire and is disposed between the upper fixed plate 33 and the lower fixed plate 34 so as to abut against the upper spring seat 36 and the lower spring seat 38 that are disposed opposite to each other in the vertical direction. In this embodiment, the upper spring seat 36 and the lower spring seat 38 are fixed by bolts 37 and 39, respectively, and the bolts 37 and 39 are configured as convex parts that protrude between the upper fixed plate 33 and the lower fixed plate 34. Each of the springs 35 is disposed by being fitted into the bolts 37 and 39 that are convex parts in the vertical direction, and is disposed so as to abut against the upper spring seat 36 and the lower spring seat 38. Therefore, the movement of the springs 35 in the front-rear direction is restricted by the bolts 37 and 39. As a result, the springs 35 will not fall out in the front-rear direction unless the distance between the upper fixed plate 33 and the lower fixed plate 34 is larger than the natural length of the springs 35.

[0043] In this embodiment, three springs are arranged in one spring unit 30. In this embodiment, four spring units 30 are arranged in each of the front and rear directions of the upper car pulley 20.

[0044] 4 is a schematic diagram showing an enlarged view of the fall prevention rod 31. As shown in FIG. 4, the fall prevention rod 31 is composed of a rod-shaped member arranged from the upper through-hole to the lower through-hole 49. The upper end side and the lower end side in the vertical direction of the fall prevention rod 31 are each provided with a screw 31a. Nuts 32a and 32b (see FIG. 2B), which will be described later, are fixed to the portion where the screw 31a is provided. In this embodiment, as shown in FIG. 4, no screw is provided in the central portion 31b between the screws 31a, 31a provided at the upper end and the lower end, but a configuration in which screws are provided all over the portion may be used.

[0045] As shown in Fig. 2B, the fall prevention rod 31 is fixed by a nut 32a (double nut in Fig. 2B) on the upper surface side of the lower bent portion 6b of the upper frame 6, and is also fixed by a nut 32b on the lower surface side of the upper bent portion 22a of the pulley support part 22. This fixes the fall prevention rod 31 to the upper frame 6 and the pulley support part 22, and prevents the upper frame 6 and the pulley support part 22 from moving away from each other from their fixed positions. On the other hand, since the fall prevention rod is not fixed between the upper frame 6 and the pulley support part 22 by a nut or the like, it does not restrict movement of the upper frame 6 and the pulley support part 22 in a direction in which they approach each other.

[0046] The length of the fall prevention rod 31 in the downward direction from the upper bent portion 22a of the pulley support portion 22 is set to a length that will not come off when the upper frame 6 and the pulley support portion 22 are separated from each other during maintenance so that the spring 35 can be removed from the spring unit 30. The fall prevention rods 31 are provided in two positions on either side of the rotating shaft in the front-rear direction of the upper car pulley 20.

[0047] Incidentally, the car-upper spring structure 24 supports not only the weight of the car body 3, but also the load mass and the suspended mass of the compensating ropes 17 and the tail cords 18. In other words, the load of the car 40 suspended from the main ropes 13 is entirely applied to the car-upper spring structure 24. Therefore, in the car-upper spring structure 24, the size of each spring 35, the number of springs to be arranged, etc. are set to a level capable of withstanding the load.

[0048] [Load sensor device] The load sensor device 27 is a device that detects the load applied to the car 40, and is provided in the space between the upper frame bracket 25 and the pulley support bracket 23. In this embodiment, the load sensor device 27 is provided at two locations located on either side of the car pulley 20 in the direction along the rotation plane of the car pulley 20, and is provided on a diagonal line passing through the center of the car pulley 20 when viewed from above. Here, the diagonal line refers to a diagonal line of any of the quadrangles formed by two sides parallel to the extension direction of the upper frame 6 and two sides parallel to the extension direction of the upper frame bracket 25 when the car pulley 20 is viewed from above. That is, in this embodiment, when the car pulley 20 is viewed from the front, for example, with the central axis of the car pulley 20 as the center, one load sensor device 27 is provided on the right rear side, and the other load sensor device 27 is provided on the left front side.

[0049] The load sensor device 27 is composed of a detection plate 28 made of a plate-like member and a sensor unit 26 that detects the position of the detection plate 28. The detection plate 28 is composed of a plate-like member having one end fixed to the lower side surface portion 25b in the vertical direction of the upper inter-frame bracket 25 and the other end bent to have a surface facing the sensor unit 26.

[0050] On the other hand, the sensor unit 26 is supported in a cantilever manner by fixing units 26a, 26b fixed to the upper side surface unit 23b in the vertical direction of the pulley support unit bracket 23, and is disposed at a position facing the detection plate 28. The detection plate 28 and the sensor unit 26 are disposed so as to be separated from each other with a predetermined gap therebetween.

[0051] In this embodiment, the load of the car 40 is applied to the upper frame 6, and therefore, as the load of the car 40 increases, each spring 35 of the car upper spring structure 24 provided between the upper frame 6 and the pulley support portion 22 contracts. As the springs 35 contract, the distance between the detection plate 28 and the sensor unit 26 changes. In the load sensor device 27, the sensor unit 26 detects the distance to the detection plate 28, thereby making it possible to detect the load applied to the car 40.

[0052] 3. Effects of the car configuration of this embodiment As mentioned above, in the case of a high-speed elevator with a large load, in order to support a larger mass, it is necessary to increase the size of the vibration-proof members (elastic members) provided on the car to increase the spring constant and to arrange them more closely together. In this embodiment, by providing fall prevention rods 31 that prevent the springs 35 from falling, more springs 35 can be arranged more closely together. Therefore, it is possible to save space compared to the case where large springs are used. Below, the configuration of a car according to a comparative example is shown, and the effect of the configuration of the car according to this embodiment is explained.

[0053] Figures 6A and 6B are schematic diagrams of a car according to a comparative example. The car shown in Figures 6A and 6B differs from the first embodiment in that it is not provided with the fall prevention rod 31 shown in Figures 2A and 2B. In Figures 6A and 6B, the same reference numerals are used for the parts corresponding to Figures 2A and 2B, respectively, and duplicated explanations are omitted.

[0054] As shown in the car spring structure 54 according to the comparative example in Fig. 6A and Fig. 6B, the pulley support part 22 is pulled up to the upper frame 6 side via a plurality of spring units 30. Meanwhile, in the spring unit 30, as shown in the enlarged view of Fig. 3A, each spring 35 is fitted between the bolt 37 of the upper fixed plate 33 and the bolt 39 of the lower fixed plate 34, but is not fixed to the upper fixed plate 33 and the lower fixed plate 34. In addition, in order to make each spring 35 contract with an increase in the load of the car 40, it is necessary to make the distance between the upper frame 6 and the pulley support part 22 variable. For this reason, it is not possible to connect between the bolt 37 and the bolt 39 shown in Fig. 3A. Therefore, if the upper frame 6 and the pulley support part 22 are separated from each other by more than the natural length of the spring 35, there is a risk of the spring 35 falling in the front-rear direction.

[0055] Therefore, in the configuration shown in the comparative example, when the distance between the upper frame 6 and the pulley support part 22 becomes large due to unexpected vibration or the like, there is a risk that the spring 35 will fall. Furthermore, during maintenance, when the pulley support part 22 is moved away from the upper frame 6 side to replace the spring 35 or perform maintenance on the car pulley 20, it is necessary to perform relative positioning again when the pulley support part 22 is pulled up to the upper frame 6 side. For this reason, it is not easy to replace the spring 35 or perform maintenance on the car pulley 20. In particular, when the number of springs 35 is large in the car spring structure 54, it becomes difficult to position the upper frame to which the upper fixed plate 33 is fixed and the pulley support part 22 to which the lower fixed plate 34 is fixed.

[0056] In contrast, in this embodiment, the car spring structure 24 includes a fall prevention rod 31 that allows movement in a direction that shortens the distance between the upper frame 6 and the pulley support part 22, but restricts movement in a direction that separates them. As a result, even if the upper frame 6 and the pulley support part 22 attempt to move in a direction that separates them due to unexpected vibration or the like, the positions of the upper frame 6 and the pulley support part 22 can be maintained in the initial set positions, so that the fall of the spring 35 can be prevented.

[0057] Furthermore, in this embodiment, during maintenance, with the fall prevention rod 31 inserted through the upper through hole and the lower through hole 49, for example, the lower nut 32b can be shifted downward in the vertical direction and fixed to separate the upper frame 6 and the pulley support part 22. That is, with the fall prevention rod 31 inserted through the upper through hole and the lower through hole 49, the upper frame 6 and the pulley support part 22 can be separated. As a result, the positional relationship between the upper frame 6 and the pulley support part 22 can be maintained in the vertical direction by the fall prevention rod 31, which makes it easy to position the upper frame 6 and the pulley support part 22 when returning them to their original positions. Therefore, maintenance of the car upper pulley 20 and replacement of the spring 35 are easy.

[0058] In this way, the configuration of this embodiment has the advantage that even when a large number of springs 35 are arranged between the upper frame 6 and the pulley support portion 22 to form an upper car spring structure 24 capable of withstanding the load of a large-capacity passenger car 40, the replacement work of the springs 35 can be easily performed.

[0059] It is also possible to use anti-vibration rubber as an elastic member for constructing the load sensor device 27. However, when anti-vibration rubber is used, as described above, hysteresis occurs in the load and the displacement of the anti-vibration rubber, and the influence of non-linearity and deterioration is easily caused. In contrast, the car spring structure 24 of this embodiment is configured using springs made of metal wire, so it is less susceptible to the influence of non-linearity and deterioration, and the accuracy of load detection can be maintained.

[0060] In this embodiment, the upper through-hole is provided in the upper bent portion 6a of the upper frame 6, and the lower through-hole 49 is provided in the lower fixed plate 34, but this is not limiting. The upper through-hole may be provided in a member that is attached integrally to the upper frame 6, for example, in the upper fixed plate. On the other hand, the lower through-hole 49 may be provided in a member that is attached integrally to the pulley support portion 22, for example, in the pulley support portion 22 itself. In this case, the width of the upper bent portion 22a of the pulley support portion 22 in the front-rear direction is increased, and the lower through-hole is provided at an appropriate position.

[0061] Second Embodiment Next, an elevator car according to a second embodiment of the present invention will be described. Fig. 5A is a schematic diagram of a main part including the car pulley 20 in a car 40 according to the second embodiment of the present invention, as viewed from the front, and Fig. 5B is a schematic diagram of a main part including the car pulley 20 in the car 40, as viewed from the side. The second embodiment differs from the first embodiment in that a fall prevention bent plate 41 is used instead of the fall prevention rod 31 in the first embodiment. Since the other configurations are the same as those in the first embodiment, in Figs. 5A and 5B, parts corresponding to Figs. 2A and 2B are given the same reference numerals, and duplicated explanations will be omitted.

[0062] In this embodiment, the car spring structure 44 is composed of a plurality of spring units 30 and a fall prevention bent plate 41 (corresponding to the fall prevention member of the present invention). The fall prevention bent plate 41 is a bent plate that supports the space between the upper frame 6 and the pulley support part 22, and is composed of a bent plate with a U-shaped cross section whose upper end side and lower end side are bent toward the car pulley side. In this embodiment, the left-right length of the fall prevention bent plate is configured to be approximately the same as the outer diameter of the spring 35, for example, but is not limited to this. In this embodiment, the fall prevention bent plates 41 are arranged at two locations on both the front side and the rear side of the car pulley 20, sandwiching the rotation shaft.

[0063] The bent portion 41a on the upper end side of the fall prevention bent plate 41 is fixed to the lower bent portion 6b of the upper frame 6 by a bolt (not shown). The bent portion 41b on the lower end side of the fall prevention bent plate 41 is arranged so as to abut against the lower surface side in the up-down direction of the lower fixed plate 34 that constitutes the spring unit 30. The bent portion 41b on the lower end side of the fall prevention bent plate 41 is not fixed to the lower fixed plate 34. Therefore, the fall prevention bent plate 41 does not prevent the pulley support portion 22 from moving toward the upper frame 6 as the load of the car 40 increases.

[0064] Therefore, also in the second embodiment, when the load of the car 40 increases, the upper frame 6 is pulled downward and the pulley support portion 22 is pulled upward, causing each spring 35 of the car upper spring structure 44 to contract. Therefore, the load sensor device 27 detects the contraction of the spring 35 accompanying the increase in the load of the car 40, thereby making it possible to detect the load.

[0065] In the second embodiment as well, the upper frame 6 and the pulley support part 22 are fixed together by the fall prevention bent plate 41. Therefore, even if a force acts in a direction in which the upper frame 6 and the pulley support part 22 move away from the initial setting position due to unexpected vibration or the like, the positions of the upper frame 6 and the pulley support part 22 can be maintained, so that the spring 35 can be prevented from coming off.

[0066] When using the fall prevention bent plate 41 of the second embodiment, the lower through hole 49 of the lower fixed plate 34 shown in Fig. 3C may not be provided. Also, the fall prevention rod 31 of the first embodiment and the fall prevention bent plate 41 of the second embodiment may be used at the same time. In this case, the positions of the upper frame 6 and the pulley support part 22 do not shift during maintenance, so that the replacement and positioning of the spring 35 can be easily performed.

[0067] The above-mentioned embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to having all of the configurations described. For example, it is possible to replace a part of the configuration of the embodiment with another configuration, and it is also possible to add another configuration to the configuration of the embodiment. Also, it is possible to add, delete, or replace a part of the configuration of the embodiment with another configuration. [Explanation of symbols]

[0068] EXPLANATION OF REFERENCE NUMERALS 1... elevator, 2... hoistway, 3... car body, 4... car door, 5... car frame, 6... upper frame, 7... vertical frame, 8... lower frame, 9... car floor, 10... under-car vibration-proof rubber, 11... under-floor base, 12... guide roller, 13... main rope, 14... compensation bracket, 15... tail cord beam, 16... compensation suspension plate, 17... compensation rope, 18... tail cord, 20... upper-car pulley, 20a... pulley shaft, 22... pulley support section , 23... Bracket between pulley supports, 24... Upper cage spring structure, 25... Upper frame bracket, 26... Sensor section, 27... Load sensor device, 28... Detection plate, 30... Spring unit, 31... Fall prevention rod, 31a... Screw, 31b... Center section, 32a, 32b... Nut, 33... Upper fixing plate, 34... Lower fixing plate, 35... Spring, 36, 38... Spring seat, 37, 39... Bolt, 41... Fall prevention bent plate, 49... Lower through hole

Claims

1. The car body for carrying passengers and luggage, a car upper pulley around which a main rope is wound, the car upper pulley being disposed at an upper portion of the car body; a pair of pulley support portions provided at positions sandwiching the car pulley in a direction perpendicular to a rotation plane of the car pulley, the pair of pulley support portions rotatably supporting the car pulley; A pair of upper frames supporting the car body; a cage spring structure disposed between the upper frame and the pulley support portion, The cage spring structure includes: a spring unit including a plurality of springs arranged expandably between the pulley support portion and the upper frame; a fall prevention member provided between the upper frame and the pulley support portion so as to allow the pulley support portion to move toward the upper frame and to restrict the pulley support portion to move away from the upper frame. Elevator car.

2. The fall prevention member is configured with a fall prevention rod that is inserted into an upper through-hole provided on the upper frame side and is inserted into a lower through-hole provided on the pulley support part side.

2. An elevator car according to claim 1.

3. The fall prevention member is composed of a folded plate having a U-shaped cross section and a pair of folded parts, one of which is fixed to the upper frame side, and the other folded part supports the pulley support part side so as to restrict only the movement of the pulley support part in the direction away from the upper frame.

2. An elevator car according to claim 1.

4. The car body for carrying passengers and luggage, a car upper pulley around which a main rope is wound, the car upper pulley being disposed at an upper portion of the car body; a pair of pulley support portions provided at positions sandwiching the car pulley in a direction perpendicular to a rotation plane of the car pulley, the pair of pulley support portions rotatably supporting the car pulley; A pair of upper frames supporting the car body; a cage spring structure disposed between the upper frame and the pulley support portion, The cage spring structure includes: a spring unit including a plurality of springs arranged expandably between the pulley support portion and the upper frame; and a fall prevention member provided between the upper frame and the pulley support portion so as to allow the pulley support portion to move toward the upper frame and to restrict the pulley support portion to move away from the upper frame. Elevator.

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