Pulley assembly, counterweight and elevator

Abstract

To provide a balance weight and an elevator capable of securing a wide space for arranging a weight piece (weight) inside an upper frame even if a pulley is mounted on the upper frame.SOLUTION: The balance weight includes a frame body, a pulley mounting member, a pulley, and a plurality of weight pieces. The frame body has an upper frame and a lower frame facing each other in the vertical direction, and two vertical frames facing each other in the horizontal direction. The pulley mounting member is welded and fixed to the upper frame. The pulley is fixed to the pulley mounting member. The plurality of weight pieces are mounted in the frame. A part of the plurality of weight pieces is disposed inside the upper frame, and a pulley mounting member is welded to an outer surface of the upper frame.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a pulley assembly, a counterweight and an elevator including the pulley assembly. [Background technology]

[0002] In recent years, hoists are often installed at the top of hoistways to allow elevators to operate even when the hoistway pit is flooded. To prevent interference between the hoistway and the counterweight, a pulley assembly attached to the counterweight's upper frame has been proposed, which is installed at an angle relative to the upper frame (see Patent Document 1). The pulley assembly disclosed in Patent Document 1 has a tip end, along the pulley's rotation axis, that protrudes outward beyond the counterweight's upper frame. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 100615 Summary of the Invention [Problem to be solved by the invention]

[0004] The counterweight is positioned close to the wall of the hoistway. Therefore, one end of the pulley assembly along the axis of rotation of the pulley needs to be shortened from the upper frame to avoid interference with the wall of the hoistway. As a result, the offset between the center of the pulley and the center of the upper frame in the width direction becomes large when viewed from the top and bottom, making it difficult to ensure the strength of the counterweight. Therefore, it has been desired to shorten the length of the pulley assembly along the axis of rotation of the pulley to increase the flexibility of its attachment position relative to the upper frame.

[0005] In consideration of the above problems, an object of the present invention is to provide a pulley assembly that can reduce the size in the direction along the rotation axis of the pulley, and a counterweight and elevator that include such a pulley assembly. [Means for solving the problem]

[0006] To solve the above problems and achieve the object, one aspect of the present invention provides a pulley assembly comprising a first member, a second member connected to the first member, and a pulley supported by the first and second members. The first member has a base portion and first and second raised portions that rise substantially perpendicularly from the base portion. The second raised portion faces the first raised portion in a direction along the rotation axis of the pulley. The length of the second raised portion in a direction rising from the base portion is longer than the length of the first raised portion in a direction rising from the base portion. The second member is connected to the first raised portion and faces the second raised portion in a direction along the rotation axis of the pulley. The pulley is rotatably supported by the second raised portion of the first member and the second member.

[0007] A counterweight according to one aspect of the present invention comprises a frame body having an upper frame and a lower frame that face each other in the vertical direction and two vertical frames that face each other in the horizontal direction, a plurality of weight pieces mounted within the frame body, and the above-mentioned pulley assembly fixed in a position inclined horizontally relative to the upper frame. Furthermore, an elevator according to one aspect of the present invention raises and lowers the car and the counterweight connected by a rope in different directions. [Effects of the Invention]

[0008] According to the pulley assembly having the above configuration, the size of the pulley in the direction along the rotation axis can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram showing an elevator according to an embodiment. [Figure 2] FIG. 1 is a perspective view of a counterweight according to one embodiment. [Figure 3] FIG. 2 is a perspective view of one embodiment of a pulley assembly, viewed from one side. [Figure 4]FIG. 10 is a perspective view of the pulley assembly according to one embodiment, seen from the other side. [Figure 5] FIG. 1 is a longitudinal cross-sectional view of a pulley assembly according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] A pulley assembly, a counterweight, and an elevator according to one embodiment will be described below with reference to Figures 1 to 5. Note that common members in the figures are given the same reference numerals.

[0011] [Elevator configuration] First, the configuration of the elevator according to the first embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram showing an example of the configuration of an elevator according to the first embodiment.

[0012] As shown in Figure 1, elevator 1 is a so-called machine room-less elevator that does not have a machine room above an elevator shaft 100 formed within a building structure. Note that the elevator of the present invention is not limited to machine room-less elevators, and may also be an elevator that has a machine room above the elevator shaft 100.

[0013] The elevator 1 has a car 110 that moves up and down in the elevator shaft 100, a hoist 120, a counterweight 130, and a rope 170.

[0014] The elevator car 110 has a car compartment where people and objects get on and off, and a pair of car doors. The car compartment is formed in a hollow, roughly rectangular parallelepiped shape. One side of the car compartment has an entrance / exit that is opened and closed by the pair of car doors. People and objects enter and exit the car compartment through the entrance / exit. A lifting pulley 111 is attached to the bottom of the car compartment. A rope 170 is wound around the lifting pulley 111.

[0015] A weight pulley 52 of the pulley assembly 34, which will be described later, is disposed above the counterweight 130. A rope 170 is wound around the weight pulley 52 of the pulley assembly 34. One end and the other end of the rope 170 are fixed to the top of the hoistway 100. The rope 170 is attached to the hoisting machine 120 from the weight pulley 52 of the counterweight 130, and is wound around a lifting pulley 111 of the car 110.

[0016] The hoisting machine 120 is disposed at the top of the hoistway 100. This prevents the hoisting machine 120 from being submerged even if the pit of the hoistway 100 is flooded. As a result, even if the pit of the hoistway 100 is flooded, the elevator can continue to operate. A rope 170 is wound around the hoisting machine 120.

[0017] The hoist 120 is a device that winds up a rope 170 to raise and lower the car 110. The hoist 120 raises and lowers the car 110 and the counterweight 130 in a bucket-like manner via the rope 170. The operation of the hoist 120 is controlled by a control unit provided in a control panel (not shown). The control panel (not shown) is located, for example, at the top of the elevator shaft 100.

[0018] [Configuration of counterweight] Next, the configuration of the counterweight 130 will be described with reference to FIG. FIG. 2 is a perspective view of the counterweight 130.

[0019] 2, the counterweight 130 is formed in the shape of a flat, generally rectangular parallelepiped that is long in the vertical direction. The counterweight 130 includes a frame 31, a plurality of weight pieces 32 mounted on the frame 31, and a pulley assembly 34 and a buffer base 35 attached to the frame 31.

[0020] The frame body 31 includes vertical frames 41A, 41B, an upper frame 42 connecting the upper parts of the vertical frames 41A, 41B, and a lower frame 43 connecting the lower parts of the pair of vertical frames 41A, 41B.

[0021] The vertical frames 41A and 41B are members that extend in the vertical direction. The cross section of the vertical frames 41A and 41B parallel to the horizontal direction is approximately C-shaped. The vertical frames 41A and 41B have a front face, a back face opposite the front face, and side faces that are continuous with the front face and the back face. The side face of the vertical frame 41A and the side face of the vertical frame 41B face each other in the horizontal direction.

[0022] Hereinafter, the up-down direction will be referred to as the height direction Y. The direction in which the side surfaces of the vertical frames 41A, 41B face each other will be referred to as the width direction X. The direction in which the front and back surfaces of the vertical frames 41A, 41B face each other will be referred to as the thickness direction Z. The thickness direction Z is a direction perpendicular to the height direction Y and the width direction X.

[0023] Oilers 45A, 45B and upper guide shoes 46A, 46B are fixed to the upper parts of the side surfaces of the vertical frames 41A, 41B, respectively. The oiler 45A is located above the upper guide shoe 46A. The oiler 45B is located above the upper guide shoe 46B. Lower guide shoes 47A, 47B are fixed to the lower parts of the side surfaces of the vertical frames 41A, 41B, respectively.

[0024] The upper guide shoes 46A, 46B and the lower guide shoes 47A, 47B are slidably engaged with guide rails (not shown) provided in the elevator shaft 100 (see FIG. 1). The guide rails guide the up and down movement of the counterweight 130. The oilers 45A, 45B are slidably engaged with the guide rails (not shown). The oilers 45A, 45B apply lubricating oil to the guide rails. This reduces wear on the guide rails due to contact with the upper guide shoes 46A, 46B and the lower guide shoes 47A, 47B.

[0025] The upper frame 42 and the lower frame 43 are members extending in the width direction X. The cross section of the upper frame 42 and the lower frame 43 perpendicular to the width direction X is substantially C-shaped. The pulley assembly 34 is attached to the upper part of the upper frame 42 via a mounting plate 48. The buffer table 35 is attached to the lower part of the lower frame 43 via a buffer table mounting member.

[0026] The weight pieces 32 are mounted on the inside of the frame body 31. The weight pieces 32 are formed in the shape of flat plates that are long in the width direction X. The weight pieces 32 are stacked in the height direction Y and held by weight holders (not shown) connected to the inside of the vertical frames 41A, 41B.

[0027] The pulley assembly 34 is fixed in a position inclined horizontally relative to the upper frame 42. Therefore, the rotation axis of the weight pulley 52 in the pulley assembly 34 is inclined relative to the width direction X and the thickness direction Z.

[0028] The mounting plate 48 protrudes from the upper frame 42 to one side in the thickness direction Z in order to tilt the pulley assembly 34. A reinforcing bracket 49 is fixed to a side surface of the upper frame 42 that is approximately perpendicular to the thickness direction Z. The reinforcing bracket 49 is a bent member with a substantially L-shaped cross section. The reinforcing bracket 49 supports the portion of the mounting plate 48 that protrudes from the upper frame 42, thereby increasing the strength of the mounting plate 48.

[0029] The buffer table 35 faces a weight buffer (not shown) installed in the pit of the elevator shaft 100. When the counterweight 130 descends at an unexpected speed and reaches the pit, the buffer table 35 collides with the weight buffer. The weight buffer absorbs the impact caused by the collision of the counterweight 130.

[0030] [Pulley assembly configuration] Next, the configuration of the pulley assembly 34 will be described with reference to FIGS. Figure 3 is a perspective view of the pulley assembly 34 as seen from one side. Figure 4 is a perspective view of the pulley assembly 34 as seen from one side. Figure 5 is a longitudinal cross-sectional view of the pulley assembly 34.

[0031] 3 and 4, the pulley assembly 34 has a pulley support 51 and a weight pulley 52 rotatably supported by the pulley support 51. The pulley support 51 is formed in the shape of a hollow housing with two horizontally opposing sides open.

[0032] The weight pulley 52 is disposed inside the pulley support 51. The weight pulley 52 has a drum-shaped pulley body 52a and a rotation shaft 52b that coincides with the center of the pulley body 52a. A rope groove is formed on the outer circumferential surface of the pulley body 52a. A rope 170 is wound around the rope groove of the pulley body 52a. The rotation shaft 52b is rotatably supported by the pulley support 51.

[0033] The pulley support 51 has a first member 54, a second member 55, and a third member 56. The first member 54 is formed into a substantially U-shape by bending a single metal plate. The first member 54 has a base portion 541, a first raised portion 542, and a second raised portion 543.

[0034] The base portion 541 forms the lower part of the pulley support body 51. The base portion 541 is made of a rectangular plate, one flat surface of which abuts against the upper surface of the mounting plate 48. The base portion 541 is fixed to the mounting plate 48 using a fixing bolt 61.

[0035] The first raised portion 542 rises approximately vertically from one long side of the base portion 541. The first raised portion 542 is made of a plate having a flat surface that is approximately perpendicular to the horizontal direction. The second member 55 is fixed to the second raised portion 543 using a fixing bolt 62. The second member 55 is made of a plate having a flat surface that is approximately perpendicular to the horizontal direction. The first raised portion 542, together with the second member 55, forms one side of the pulley support body 51. The second member 55 rotatably supports one end of the rotation shaft 52b of the weight pulley 52.

[0036] The second rising portion 543 rises substantially perpendicularly from the other long side of the base portion 541. The first rising portion 543 is made of a plate having a flat surface that is substantially perpendicular to the horizontal direction. The length of the second rising portion 543 in the direction rising from the base portion 541 is longer than the length of the first rising portion 542 in the direction rising from the base portion 541.

[0037] The second raised portion 543 forms the other side of the pulley support body 51. The second raised portion 543 faces the first raised portion 542 and the second member 55 in the horizontal direction. The second raised portion 543 rotatably supports the other end of the rotation shaft 52b of the weight pulley 52. ​​In other words, the second raised portion 543 faces the second member 55 in the direction along the rotation shaft 52b of the weight pulley 52.

[0038] The second raised portion 543 forms substantially the entire other side of the pulley support body 51. The second raised portion 543 rotatably supports the weight pulley 52. ​​Therefore, there is no need to connect a member that supports the weight pulley 52 to the second raised portion 543. Therefore, the fixing bolt 62 does not pass through the other side of the pulley support body 51 (see FIG. 5). This allows the size of the pulley assembly 34 in the direction along the rotation axis 52b of the weight pulley 52 to be reduced.

[0039] A side cover 57 is attached to the second rising portion 543. The side cover 57 is formed into a substantially L-shape by bending a single metal plate. One end of the side cover 57 is fixed to the second rising portion 543. The other end of the side cover 57 faces the outer circumferential surface of the weight pulley 52.

[0040] A side cover 58 is attached to the second member 55. The side cover 58 is formed into a substantially L-shape by bending a single metal plate. One end of the side cover 58 is fixed to the second member 55. The other end of the side cover 58 faces the outer circumferential surface of the weight pulley 52.

[0041] The third member 56 forms the upper part of the pulley support body 51. The third member 56 is formed into a substantially U-shape by bending a single metal plate. The third member 56 has an upper cover piece 561 and two connection pieces 562 and 563.

[0042] The upper cover piece 561 is made of a rectangular plate having a plane that is approximately perpendicular to the up-down direction (height direction Y). The upper cover piece 561 faces the base portion 541 in the up-down direction. The two connection pieces 562, 563 protrude approximately perpendicularly from two opposing sides of the upper cover piece 561. The two connection pieces 562, 563 are fixed to the second rising portion 543 and the second member 55 using fixing bolts 63.

[0043] 5, the height of the head of fixing bolt 63 is lower than the height of the head of fixing bolt 62. Furthermore, the height of the head of fixing bolt 63 is lower than the height at which both ends of rotating shaft 52b of weight pulley 52 protrude from second rising portion 543 and second member 55. In pulley assembly 34, the part that protrudes most laterally on the second member 55 side is fixing bolt 62. Furthermore, the part that protrudes most laterally on the second rising portion 543 side is rotating shaft 52b.

[0044] As described above, the pulley assembly 34 can be made smaller in size in the direction along the rotation axis 52b of the weight pulley 52. ​​This allows the pulley assembly 34 to increase the degree of freedom in the mounting position of the counterweight 130 relative to the upper frame 42. As a result, it is possible to avoid interference with the wall surface of the hoistway 100 or other components installed in the hoistway 100, and to mount the pulley assembly 34 at a position where there is little offset between the center of the weight pulley 52 and the center of the upper frame 42 in the width direction Z when viewed from the up-down direction (height direction Y). Furthermore, by reducing the offset between the center of the weight pulley 52 and the center of the upper frame 42 in the width direction Z, the strength of the counterweight 130 can be ensured.

[0045] Additionally, the second raised portion 543 rotatably supports the other end of the rotary shaft 52b of the weight pulley 52. ​​Therefore, the number of parts can be reduced compared to when two second members 55 are provided. Furthermore, the first member 54 is formed by bending a single sheet of metal. This makes it possible to easily manufacture the first member 54 and ensure the strength of the first member 54.

[0046] Additionally, the second member 55 is detachably connected to the first rising portion 542 using a fixing bolt 62. This allows the second member 55 to be removed from the first rising portion 542, and the rope 170 to be easily wound around the weight pulley 52. ​​Therefore, the same ease of installation as in the past can be ensured.

[0047] The above describes the embodiments of the pulley assembly, counterweight, and elevator, including their functions and effects. However, the pulley assembly, counterweight, and elevator of the present invention are not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention as defined in the claims.

[0048] For example, in the above-described embodiment, one metal plate is bent to form the second rising portion 543. However, the first member according to the present invention may be formed, for example, by connecting two or more members by welding.

[0049] Furthermore, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the configurations described. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with another configuration.

[0050] In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but also include "parallel" and "orthogonal" and may also mean a "substantially parallel" or "substantially orthogonal" state within a range in which the functions can be exerted. [Explanation of symbols]

[0051] DESCRIPTION OF SYMBOLS 1...Elevator, 31...Frame, 32...Weight piece, 34...Pulley assembly, 35...Buffer stand, 41A, 41B...Vertical frame, 42...Upper frame, 43...Lower frame, 45A, 45B...Oiler, 46A, 46B...Upper guide shoe, 47A, 47B...Lower guide shoe, 48...Mounting plate, 49...Reinforcement bracket, 51...Pulley support, 52...Weight pulley, 52a...Pulley body, 52b...Rotating shaft, 54...First member, 55...Second member, 56...Third member, 57, 58...Side cover, 61, 62, 63...Fixing bolt, 100...Hoistway, 111...Lifting pulley, 120...Hoisting machine, 170...Rope, 541...Base portion, 542...first rising portion, 543...second rising portion, 561...upper cover piece, 562, 563...connecting piece

Claims

1. A first member; a second member connected to the first member; a pulley supported by the first member and the second member, the first member has a base portion, a first rising portion that rises substantially vertically from the base portion, and a second rising portion that rises substantially vertically from the base portion and faces the first rising portion in a direction along the rotation axis of the pulley, a length of the second rising portion in a direction rising from the base portion is longer than a length of the first rising portion in a direction rising from the base portion; the second member is connected to the first rising portion and faces the second rising portion in a direction along the rotation axis of the pulley, The pulley is rotatably supported by the second raised portion of the first member and the second member. Pulley assembly.

2. The first member is formed by bending a single metal plate. The pulley assembly of claim 1 .

3. The second member is detachably connected to the first member. The pulley assembly of claim 1 .

4. a frame body having an upper frame and a lower frame that face each other in the vertical direction and two vertical frames that face each other in the horizontal direction; a plurality of weight pieces mounted within the frame; a pulley assembly fixed to the upper frame in a position inclined horizontally, The pulley assembly includes: A first member; a second member connected to the first member; a pulley rotatably supported by the first member and the second member, the first member has a base portion fixed to the upper frame, a first rising portion rising substantially vertically from the base portion, and a second rising portion rising substantially vertically from the base portion and facing the first rising portion in a direction along the rotation axis of the pulley, a length of the second rising portion in a direction rising from the base portion is longer than a length of the first rising portion in a direction rising from the base portion; the second member is connected to the first rising portion and faces the second rising portion in a direction along the rotation axis of the pulley, The pulley is rotatably supported by the second raised portion of the first member and the second member. Counterweight.

5. In an elevator in which a car and a counterweight connected by a rope rise and fall in different directions, The counterweight is a frame body having an upper frame and a lower frame that face each other in the vertical direction and two vertical frames that face each other in the horizontal direction; a plurality of weight pieces mounted within the frame; a pulley assembly fixed to the upper frame in a position inclined horizontally, The pulley assembly includes: A first member; a second member connected to the first member; a pulley rotatably supported by the first member and the second member, the first member has a base portion fixed to the upper frame, a first rising portion rising substantially vertically from the base portion, and a second rising portion rising substantially vertically from the base portion and facing the first rising portion in a direction along the rotation axis of the pulley, a length of the second rising portion in a direction rising from the base portion is longer than a length of the first rising portion in a direction rising from the base portion; the second member is connected to the first rising portion and faces the second rising portion in a direction along the rotation axis of the pulley, The pulley is rotatably supported by the second raised portion of the first member and the second member. Elevator.

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