Elevator and method

Abstract

To provide an elevator and a method capable of improving the vibration and noise inside a car without incurring large costs in the elevator without a sufficient vibration isolated structure.SOLUTION: An elevator according to the present embodiment comprises a car applied by the vibration damping paint based on the result of the vibration analysis performed on the analytical model of a car composed of divided multiple elements based on the finite element method.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] Embodiments of the present invention relate to an elevator and a method.

Background Art

[0002] In recent years, elevators have a sufficient vibration isolation structure to suppress in-car vibration and in-car noise. On the other hand, in old-type elevators or freight elevators with low performance requirements for in-car vibration and in-car noise, a sufficient vibration isolation structure is often not provided. For this reason, some users of old-type elevators or freight elevators may request improvements in in-car vibration and in-car noise.

[0003] As a method to meet such demands, renewals such as full removal renewal and semi-removal renewal can be cited as an example. However, such large-scale structural changes have the problem of high costs. For this reason, it is desired to realize a new technology that can meet the above-mentioned demands without incurring high costs. In other words, it is desired to realize a new technology that can improve in-car vibration and in-car noise in elevators without sufficient vibration isolation structure without incurring high costs.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Therefore, the problem to be solved by the present invention is to provide an elevator and a method capable of improving car vibration and car noise without incurring a large cost in an elevator that does not have a sufficient vibration isolation structure. In addition, even if a sufficient vibration isolation structure is provided during manufacturing, there may be a further requirement, so the present invention is also applicable when a stronger vibration isolation structure is required.

Means for Solving the Problems

[0006] According to one embodiment, the elevator includes a car coated with vibration damping paint based on the results of a vibration analysis performed on an analysis model of a car composed of a plurality of elements divided based on the finite element method.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0008] Hereinafter, embodiments will be described with reference to the drawings. First, with reference to FIG. 1, a configuration example of the car 1 will be described. In the present embodiment, a case where the car 1 is a car of a freight elevator with low performance requirements for in-car vibration and in-car noise will be described.

[0009] The car 1, for example, carries luggage or users who carry the luggage and moves within the hoistway. As shown in FIG. 1, the car 1 includes a car frame 2 and a car compartment 3 disposed within the car frame 2.

[0010] The car frame 2 has an upper beam 4, a lower beam 5, and a pair of vertical frames 6. The upper beam 4, the lower beam 5, and the vertical beams 6 are joined so as to form a rectangular frame surrounding the car compartment 3. The upper beam 4 is joined to the pair of vertical frames 6 above the car compartment 3, and the lower beam 5 is joined to the pair of vertical frames 6 below the car compartment 3. The car 1 is suspended, for example, by a main rope (not shown) attached to the upper beam 4.

[0011] As described above, since the car 1 is a car for a luggage elevator with low performance requirements for in-car vibration and in-car noise, no vibration-proof rubber or the like made of an elastic body having vibration damping properties is provided below the floor surface 3a of the car compartment 3. That is, the car 1 has only a minimum vibration-proof structure and does not have a sufficient vibration-proof structure to provide a comfortable riding experience for users. According to this, the cost associated with the introduction of the elevator can be reduced.

[0012] However, some users who use such a car 1 may request improvement of in-car vibration and in-car noise. As a method of meeting such a request, renewal such as full removal renewal or semi-removal renewal can be cited as an example, but such a large-scale structural change has a problem of high cost.

[0013] Therefore, in the present embodiment, a method capable of improving (suppressing) in-car vibration and in-car noise in the car 1 without incurring a large cost will be described.

[0014] One way to improve the in-car vibration and in-car noise in the car cabin 1 without incurring much cost is to attach vibration damping materials and sound absorbing materials to the outer surface of the car cabin 3 of the car cabin 1. However, when attaching vibration damping materials and sound absorbing materials to the outer surface of the car cabin 3 of the car cabin 1, it is time-consuming because a process of cutting the vibration damping materials and sound absorbing materials according to the shape of the car cabin 3 is required.

[0015] In addition, the vibrations and noises generated inside the car cabin 3 do not occur uniformly throughout the car cabin 3, and the presence and magnitude of vibrations and noises differ for each location in the car cabin 3. Therefore, simply attaching vibration damping materials and sound absorbing materials uniformly to the outer surface of the car cabin 3 may not be able to suitably suppress the vibrations and noises generated inside the car cabin 3.

[0016] For this reason, in the method according to the present embodiment, the process of cutting vibration damping materials and sound absorbing materials is omitted by using vibration damping paint instead of the above-described vibration damping materials and sound absorbing materials. Further, in the method according to the present embodiment, for each location in the car cabin 3, the magnitude of vibrations and noises generated inside the car cabin 3 is estimated, and the thickness of the vibration damping paint applied to the car cabin 3 is varied according to the estimated magnitude of vibrations and noises, thereby suitably suppressing the vibrations and noises generated inside the car cabin 3.

[0017] The finite element method is used as a method for estimating the magnitude of vibrations and noises for each location in the car cabin 3. The finite element method is a method of creating an analysis model in which a structure to be analyzed is divided into a finite number of elements (meshes) and analyzing the analysis model. In the present embodiment, vibration analysis is performed on the analysis model of the car cabin 3 of the car cabin 1 composed of a plurality of elements divided based on the above-described finite element method, and the magnitude of vibrations and noises for each location in the car cabin 3 is estimated.

[0018] FIG. 2 is a diagram showing an example of an analysis model M1 created based on the finite element method. Note that the analysis model M1 shown in FIG. 2 is an analysis model corresponding to the floor surface 3a of the car cabin 3 created based on the finite element method. The analysis model M1 includes 55 elements divided based on the finite element method and 69 nodes corresponding to the vertices of these elements.

[0019] FIG. 3 is a diagram showing an example of the result of performing a vibration analysis using the analysis model M1 shown in FIG. 2. One method of performing a vibration analysis using the finite element method is frequency response analysis. Frequency response analysis is an analysis method in which the analysis target is repeatedly vibrated at a specified frequency, and the response when the analysis target reaches a steady state is confirmed. In the present embodiment, frequency response analysis is performed using the above-described analysis model M1, and the response magnification at each node included in the analysis model M1 is calculated.

[0020] FIG. 3 shows the result when frequencies included in the frequency range of 28,500 Hz to 30,000 Hz are given to the analysis model M1, and shows the response magnification at five nodes (nodes P1, P13, P41, P61, P86) included in the analysis model M1. Note that the vertical axis of the graph in FIG. 3 indicates the response magnification, and the horizontal axis indicates the frequency.

[0021] As shown in FIG. 3, the response magnification at the five nodes P1, P13, P41, P61, and P86 all shows the maximum value when the frequency of 29,241.5 Hz, which is one of the dominant frequencies, is given to the analysis model M1. The response magnification increases as the displacement of the node when the analysis model M1 is vibrated becomes larger. That is, the vibration and noise inside the basket tend to be larger in the vicinity of the node with a large response magnification.

[0022] FIG. 4 shows an example of the result of performing a vibration analysis using the analysis model M1 shown in FIG. 2, and is a diagram showing the maximum value of the response magnification at five nodes P1, P13, P41, P61, and P86 included in the analysis model M1. As shown in FIG. 4, the maximum value of the response magnification at node P1 is 0.8489708, the maximum value of the response magnification at node P13 is 0, the maximum value of the response magnification at node P41 is 0.2063253, the maximum value of the response magnification at node P61 is 0.6645983, and the maximum value of the response magnification at node P86 is 0.6418634.

[0023] As described above, since the vibration and noise inside the car tend to increase more in the vicinity of the nodes with a larger response magnification, according to the results of the frequency response analysis using the analysis model M1, the location near the node P1 has the largest vibration and noise inside the car on the floor surface 3a of the car compartment 3, and it is estimated that the location near the node P13 has the smallest vibration and noise inside the car on the floor surface 3a of the car compartment 3.

[0024] In the present embodiment, based on the results of the above-described frequency response analysis, the vibration damping paint is applied to the outer surface of the car compartment 3. For example, on the outer surface of the floor surface 3a corresponding to the location near the node P1, based on the response magnification "0.8489708" at the node P1, the vibration damping paint is applied with a thickness of 0.85 mm. Also, on the outer surface of the floor surface 3a corresponding to the location near the node P13, based on the response magnification "0" at the node P13, the vibration damping paint is not applied. Further, on the outer surface of the floor surface 3a corresponding to the location near the node P41, based on the response magnification "0.2063253" at the node P41, the vibration damping paint is applied with a thickness of 0.21 mm. Similarly, on the outer surface of the floor surface 3a corresponding to the location near the node P61, the vibration damping paint is applied with a thickness of 0.66 mm, and on the outer surface of the floor surface 3a corresponding to the location near the node P86, the vibration damping paint is applied with a thickness of 0.64 mm.

[0025] Note that the location near each node may be defined, for example, as the location of the elements located around it when each node is the center. For example, the location near the node P1 is the location of the elements located around it when the node P1 is the center, that is, the elements surrounded by the nodes P1, P2, P4, P3, the elements surrounded by the nodes P1, P3, P63, P62, the elements surrounded by the nodes P1, P62, P58, and the elements surrounded by the nodes P1, P58, P59, P2.

[0026] Thus, in this embodiment, based on the results of the above frequency response analysis, the damping paint is applied thicker to the locations near the nodes with a large response magnification where car body vibrations and car body noises are estimated to be large, and the damping paint is applied thinner to the locations near the nodes with a small response magnification where car body vibrations and car body noises are estimated to be small. According to this, since the damping paint with a suitable thickness can be applied to each location in the car body chamber 3, vibrations and noises generated in the car body chamber 3 can be suitably suppressed.

[0027] As described above, in this embodiment, as a method for improving car body vibrations and car body noises in the car 1, a vibration analysis is performed on the analysis model M1 of the floor surface 3a of the car body chamber 3 composed of a plurality of elements divided based on the finite element method, and based on the results of the vibration analysis, a damping paint is applied to the outer surface of the floor surface 3a of the car body chamber 3.

[0028] According to this, first, it is possible to omit the process of cutting damping materials and sound absorption materials by using the damping paint, and the labor required for construction can be reduced. Further, it is possible to estimate where and to what extent vibrations and noises are generated on the floor surface 3a of the car body chamber 3, and to vary the thickness of the damping paint applied to the outer surface of the floor surface 3a of the car body chamber 3 according to the magnitude of the estimated vibrations and noises, and vibrations and noises generated in the car body chamber 3 can be suitably suppressed.

[0029] In addition, since the method according to this embodiment only requires applying the damping paint to the outer surface of the floor surface 3a of the car body chamber 3, large-scale structural changes such as full removal renewal and semi-removal renewal are not required, and the car body vibrations and car body noises of the car 1 can be improved without incurring a large cost.

[0030] In addition, in the present embodiment, the case where the floor surface 3a of the car body 3 is taken as the analysis target and the vibration analysis is performed on the analysis model M1 corresponding to the floor surface 3a has been described. However, the present invention is not limited thereto. For example, the side plates, doors (car doors), ceiling surfaces, etc. of the car body 3 may be taken as the analysis targets, and the analysis models corresponding thereto may be created and the vibration analysis may be performed. Also in this case, similar to the case where the floor surface 3a of the car body 3 is taken as the analysis target, based on the results of the vibration analysis, by applying the vibration damping paint to the outer surface of the analysis target, the vibration inside the car and the noise inside the car of the elevator car 1 can be suitably suppressed.

[0031] Further, in the present embodiment, the case where the analysis model M1 of the floor surface 3a of the car body 3 includes 55 elements divided based on the finite element method and 69 nodes corresponding to the vertices of these elements has been described. However, the present invention is not limited thereto, and the number of elements and the number of nodes included in the analysis model M1 can be set to arbitrary values. Note that by increasing the number of elements and the number of nodes included in the analysis model M1, it is possible to perform a more accurate vibration analysis.

[0032] Furthermore, in the present embodiment, the case where the vibration damping paint is applied at a thickness approximately equal to the response magnification at each node in the vicinity of each node has been described. However, the present invention is not limited thereto. For example, in the vicinity of each node, the vibration damping paint may be applied at a thickness that is n times or 1 / n times (n is an arbitrary natural number) the response magnification at each node.

[0033] Alternatively, damping paint may be applied in the vicinity of each node with a thickness based on the ratio of the response magnification at each node. Specifically, in the present embodiment, damping paint is applied with a thickness of 0.85 mm in the vicinity of node P1 based on the response magnification "0.8489708" at node P1, and damping paint is applied with a thickness of 0.21 mm in the vicinity of node P41 based on the response magnification "0.2063253" at node P41. However, the present invention is not limited to this. Since the ratio of the response magnification "0.8489708" at node P1 to the response magnification "0.2063253" at node P41 is approximately "4:1", for example, damping paint may be applied with a thickness of 4 mm in the vicinity of node P1 and damping paint may be applied with a thickness of 1 mm in the vicinity of node P41.

[0034] In the present embodiment described above, the case where the car 1 is a car of a freight elevator with low performance requirements for in-car vibration and in-car noise has been described. However, the present invention is not limited to this. For example, if the car 1 is a car of an old-type elevator or the like that does not have a sufficient vibration isolation structure, whether it is an existing car or a newly installed car, the method according to the present embodiment can be applied to improve the in-car vibration and in-car noise in the car.

[0035] According to one embodiment described above, it is possible to provide an elevator and a method capable of improving in-car vibration and in-car noise without incurring a large cost in an elevator that does not have a sufficient vibration isolation structure.

[0036] Although some embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, as well as in the invention described in the claims and its equivalent scope.

Description of Reference Numerals

[0037] 1…car, 2…car frame, 3…car chamber, 3a…floor surface, 4…upper beam, 5…lower beam, 6…vertical frame, M1…analysis model.

Claims

1. An elevator, comprising a car coated with a vibration damping paint, based on the results of a vibration analysis performed on an analysis model of the car composed of a plurality of elements divided based on the finite element method.

2. The elevator according to claim 1, wherein the vibration damping paint is applied to the car based on the response magnification factor at each node of the plurality of elements obtained as a result of the vibration analysis.

3. When a first node among the nodes of the plurality of elements shows a first response magnification factor and a second node different from the first node shows a second response magnification factor smaller than the first response magnification factor, the vibration damping paint is applied thicker to a first location of the car corresponding to the first node than to a second location of the car corresponding to the second node. The elevator according to claim 2, characterized in that.

4. The elevator according to claim 1, wherein the analysis model of the car includes at least one of an analysis model of the floor surface of the car, an analysis model of the side plates of the car, an analysis model of the door of the car, or an analysis model of the ceiling surface of the car.

5. Creating an analysis model of a car composed of a plurality of elements divided based on the finite element method; Performing a vibration analysis on the analysis model; Applying a vibration damping paint to the car based on the results of the vibration analysis; A method comprising.

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