AU2009349981B2

AU2009349981B2 - Improved lifting mechanism for elevator

Info

Publication number: AU2009349981B2
Application number: AU2009349981A
Authority: AU
Inventors: Zhixiang Jin; Guoping Shen
Original assignee: Shanghai desheng migao elevator co Ltd
Current assignee: Shanghai Desheng Migao Elevator Co Ltd
Priority date: 2009-07-14
Filing date: 2009-12-21
Publication date: 2014-11-20
Anticipated expiration: 2029-12-21
Also published as: CN101955111B; SG176932A1; AU2009349981A1; WO2011006286A1; MY161017A; CN101955111A

Abstract

An improved lifting mechanism for an elevator consists of a supporting beam (8), a traction machine (2) fixed on the supporting beam (8) and provided with a traction sheave, a traction rope (3), a cage (4) and a counterweight (5) provide with counterweight deflector sheaves (51) on its top. The cage (4) has a cage frame (10) on the top, outside and under the bottom. On the top of the cage frame (10) are there two fore-and-aft spaced cage deflector sheaves (41) whose rotating planes are positioned in the direction of the cage depth and in the eudipleural center plane of the cage. One end of the traction rope (3) is fixed to the supporting beam (8) by use of a first rope hitch plate (71), while the other end of the traction rope (3) wraps around the two cage deflector sheaves (41) and the traction sheave, then wraps around the counterweight deflector sheaves (51) and finally is fixed to the supporting beam (8) by use of a second rope hitch plate (72). The cage of an elevator has the cage deflector sheaves on the front and the back of the top, so as to get over the unbalance caused by the front and back offset load of the elevator cage, avoid the blockage of the cage, and reduce the number of guide rails. The elevator can be driven with saved force by roping of the moving sheave group.

Description

1 An Improved Lifting Mechanism for the Elevator Technical Field of the Invention The present invention relates to the mechanical fields, particularly to lifting mechanism, and more particularly to an improved lifting mechanism for the elevator. Background of the Invention The following discussion of the background to the invention is intended to facilitate an understanding of the invention. However, it should be appreciated that the discussion is not an acknowledgement or admission that any of the material referred to was published, known or part of the common general knowledge as at the priority date of the application. In the prior art, the suspension center of an elevator is located in the center of the cage structure with two conventional suspension points at left and right. For the elevators with short cage depth, offset load could not be easily observed because light load would not lead to large structure distortion. However, when the load becomes heavier with the depth of the cage much longer than the width, the cage of the left and right suspended type elevator would cause large distortion and tilt towards the heavy side, affecting loading of cargo. The cage distortion is usually reduced by adding the guide rails i.e. setting four or six guide rails, however, more serious distortion may cause the blockage and stop of the cage. Summary of the Invention It is desirable to provide an improved lifting mechanism for an elevator. The improved lifting mechanism for the elevator is to address the technical problem in the prior art that the left and right suspended type elevator cage emerges large distortion, blockage and stop with heavy load. According to the present invention there is provided a lifting mechanism for an elevator including a supporting beam, a traction machine, a traction rope, a cage and a counterweight, said traction machine being fixed on the supporting beam and 2 provided with a traction sheave on its power take-off shaft, said cage is provided with cage frames on the top, outside and under the bottom, and said counterweight is provided with counterweight deflector sheaves on its top, wherein said cage frame which is set on the top of said cage is provided with two cage deflector sheaves on its top and wherein the rotating planes of said cage deflector sheaves are both positioned in the direction of the cage depth and in the eudipleural center plane of the cage and wherein the two cage deflector sheaves are fore-and-aft spaced, one end of said traction rope being fixed to the supporting beam through a first rope hitch plate, while the other end of the traction rope wraps around the two cage deflector sheaves and said traction sheave, then wraps around said counterweight deflector sheaves and finally is fixed to the supporting beam through a second rope hitch plate. In a form of the present invention, the counterweight is positioned under the supporting beam and provided with two counterweight deflector sheaves on its top. The supporting beam is provided with a first deflector sheave, which is on the top of the counterweight, and a second deflector sheave and a third deflector sheave, which are on the top of the cage deflector sheaves. One end of the traction rope is fixed to the supporting beam through a first rope hitch plate, while the other end of the traction rope wraps around a cage deflector sheave downward and the second deflector sheave and the third deflector sheave upward, then wraps around another cage deflector sheave downward and the traction sheave upward, then wraps around a counterweight deflector sheave downward and the first deflector sheave upward, then warps around another counterweight deflector sheave downward and finally is fixed to the supporting beam upward through the second rope hitch plate. In another form of the present invention, each left and right side of the cage is provided with a guide rail. The operating principle of the present invention is that when the cage depth is much longer than the width, two fore-and-aft cage deflector sheaves are set on the top of the cage along the middle line of the cage width so as to get over the unbalance caused by the fore-and-aft offset load of the cage. The first deflector sheave, the second deflector sheave and the third deflector sheave positioned on the supporting 3 beam of the machine room serve as fixed pulleys, while the cage deflector sheaves and the counterweight deflector sheaves serve as moveable pulleys. The above said fixed pulleys and moveable pulleys form a sheave group of 1:4. The cage can be driven with saved force by traction motor compared with regular roping. Compared with the prior art, the present invention has positive and obvious effects. The fore-and-aft cage deflector sheaves are set on the top of the cage so as to get over the unbalance caused by the fore-and-aft offset load of the elevator cage, avoid the blockage of the cage, and reduce the number of guide rails. The elevator can be driven with saved force by roping of the moving sheave group. Brief Description of the Drawings Figure 1 is the structure schematic view of the example 1 of the improved lifting mechanism for the elevator according to the present invention. Figure 2 is the cage suspension structure schematic view of the example 1 of the improved lifting mechanism for the elevator according to the present invention. Figure 3 is the counterweight suspension structure schematic view of the example 1 of the improved lifting mechanism for the elevator according to the present invention. Figure 4 is the cage suspension structure schematic view of the example 2 of the improved lifting mechanism for the elevator according to the present invention. Figure 1 is the counterweight suspension structure schematic view of the example 2 of the improved lifting mechanism for the elevator according to the present invention. Detailed Description of the Invention Example 1 As shown in Figures 1, 2 and 3, the improved lifting mechanism for the elevator according to the present invention consists of a supporting beam 8, a traction machine 2, a traction rope 3, a cage 4 and a counterweight 5. A control cabinet 1 and the 4 traction machine 2 are set in the machine room 6 of the wellhole. A cage frame 10 is set on the outside of the cage 4 and provided with two cage deflector sheaves 41 on its top. The rotating planes of the cage deflector sheaves 41 are both positioned in the direction of the cage depth and in the eudipleural center plane of the cage 4. The two cage deflector sheaves are fore-and-aft spaced. The traction machine 2 is provided with a traction sheave. One end of the traction rope 3 is fixed to the supporting beam 8 through a first rope hitch plate 71, while the other end of the traction rope 3 wraps around the cage deflector sheaves 41 on the top of the cage 4 and the traction sheaves, then wraps around the counterweight deflector sheaves 51 on the top of the counterweight 5 and finally is fixed to the supporting beam 8 through a second rope hitch plate 72. Furthermore, a cage deflector sheaves 41 is set close to the entrance of the cage 4, while another cage deflector sheaves 41 is set close to the backend of the cage. So the cage 4 would not tilt caused by large offset load. Moreover, there are two counterweight deflector sheaves 51. A first deflector sheave 91, a second deflector sheave 92 and a third deflector sheave 93 are fixed on the supporting beam 8. One end of the traction rope 3 is fixed to the supporting beam 8 through the first rope hitch plate 71, while the other end of the traction rope 3 wraps around a cage deflector sheave 41 downward and the second deflector sheave 92 and third deflector sheave 93 upward, then wraps around another cage deflector sheave downward 41 and the traction sheave upward, then wraps around a counterweight deflector sheave 51 downward and the first deflector sheave 91 upward, then warps around another counterweight deflector sheave 51 downward and finally is fixed to the supporting beam 8 upward through the second rope hitch plate 72. So they form a sheave group of 1:4. The cage 4 can be driven with saved force by traction motor compared with regular roping. Further, each left and right side of the cage is provided with a guide rail (not shown in the figures). Example 2 5 As shown in Figures 4 and 5, the structures in example 2 are almost as same as that of example 1 but differ in the suspension pattern of the counterweight 5 and the cage 4. In the present example, deflector sheaves are not set neither between two counterweight deflector sheave 51 nor between two cage deflector sheave 41 so as to form a sheave group of 1:2. Of course, in the case of achieving functions of the present invention, three or more deflector sheaves can be set on the top of the counterweight 5 and the cage 6.

Claims

1. A lifting mechanism for an elevator including a supporting beam, a traction machine, a traction rope, a cage and a counterweight, said traction machine being fixed on the supporting beam and provided with a traction sheave on its power take-off shaft, said cage is provided with cage frames on the top, outside and under the bottom, and said counterweight is provided with counterweight deflector sheaves on its top, wherein said cage frame which is set on the top of said cage is provided with two cage deflector sheaves on its top and wherein the rotating planes of said cage deflector sheaves are both positioned in the direction of the cage depth and in the eudipleural center plane of the cage and wherein the two cage deflector sheaves are fore-and-aft spaced, one end of said traction rope being fixed to the supporting beam through a first rope hitch plate, while the other end of the traction rope wraps around the two cage deflector sheaves and said traction sheave, then wraps around said counterweight deflector sheaves and finally is fixed to the supporting beam through a second rope hitch plate.

2. The improved lifting mechanism for the elevator as said in claim 1, wherein said counterweight is positioned under the supporting beam and provided with two counterweight deflector sheaves on its top, the supporting beam being provided with a first deflector sheave, which is on the top of the counterweight, and a second deflector sheave and a third deflector sheave, which are on the top of the cage deflector sheaves, one end of said traction rope being fixed to the supporting beam through a first rope hitch plate, while the other end of the traction rope wraps around a cage deflector sheave downward and the second deflector sheave and the third deflector sheave upward, then wraps around another cage deflector sheave downward and the traction sheave upward, then wraps around a counterweight deflector sheave downward and the first deflector sheave upward, then wraps around another counterweight deflector sheave downward and finally is fixed to the supporting beam upward through said second rope hitch plate.

3. The improved lifting mechanism for the elevator as said in claim 1 or 2, wherein each left and right side of said cage is provided with a guide rail. 7

4. A lifting mechanism for an elevator substantially as herein described with reference to the accompanying drawings.