Optimization method for obtaining thickness of elevator upper cross beam material, computer product using optimization method and storage medium

Abstract

The invention relates to an optimization method for obtaining the material thickness of an elevator upper cross beam, a computer product using the optimization method and a storage medium. The optimization method comprises the following steps that the plate thickness of an upper cross beam drawing of an existing single rope returning wheel is set as an output parameter t; according to the input elevator basic parameters, the bending moment borne by the upper cross beam is calculated; setting a safety coefficient; selecting the material thickness (from the minimum thickness) of the upper cross beam and the section attribute of the upper cross beam with the corresponding thickness; calculating to obtain an actual safety coefficient; if so, outputting the plate thickness parameter, otherwise, returning to the plate thickness selection process. Various related parameters of the upper cross beam plate are dynamically obtained according to the input conditions, the strength of the upper cross beam is accurately controlled according to the set conditions, the problems that in the prior art, strength influence factors of the upper cross beam of a single rope returning wheel are not considered completely, manual work is relied on, and excessive calculation is caused are solved, and the method is suitable for convenient application of elevator upper cross beam material thickness selection.

Description

Technical Field

[0001] This application relates to the field of elevator component optimization technology, and in particular to an optimization method for obtaining the thickness of the material of the elevator upper beam and a computer product and storage medium using the same. Background Technology

[0002] With the rapid development of new elevator technologies, people are placing increasingly higher demands on elevator comfort. Gantry-type elevators on the market generally include a bottom beam at the bottom of the car, side beams above the bottom beam, and an upper crossbeam above the side beams. Due to the increasingly heavy load requirements of elevators, a 125% rated load braking test must be conducted before an elevator is put into use. Manufacturers are cautious about lightweighting components. For single-return sheave upper crossbeams, current technology determines the material thickness based on load capacity, which has the following drawbacks:

[0003] 1. Under certain conditions, this can lead to over-design and resource redundancy;

[0004] 2. Under cost reduction design, when components are made lighter, under certain conditions, the mechanical safety factor may be too low (only slightly higher than required), which may affect customer safety and experience, and may lead to the risk of failing the 125% rated load braking test.

[0005] 3. Calculate the strength of the upper beam using the car's width limit dimensions and weight, and then cover the load and width dimensions below. If the dimensions or weight exceed the range, professional technicians need to recalculate, which will result in non-standard and increase project time. Summary of the Invention

[0006] The technical problem this application aims to solve is that the existing technology does not fully consider the factors affecting the strength of the crossbeam on the single return rope pulley, and requires manual recalculation, resulting in an excessively high safety factor or a lack of optimization, leading to resource redundancy.

[0007] To address the aforementioned technical problems, according to one aspect of this application, an optimized method for obtaining the material thickness of an elevator upper beam is provided, comprising the following steps:

[0008] S1: Determine input and output parameters: Set the elevator basic parameters as input parameters, and set the plate thickness of the upper beam drawing as output parameter t;

[0009] S2: Calculate the bending moment borne by the upper beam: Based on the input elevator basic parameters, calculate the bending moment it experiences during operation.

[0010] S3: Set safety factor: Based on the safety standards or design specifications of the elevator industry, pre-set the safety factor required for the upper beam;

[0011] S4: Select initial plate thickness and corresponding section properties: Starting from the minimum thickness, select the material thickness of the upper beam and determine the corresponding upper beam section properties;

[0012] S5: Calculate the actual safety factor: Using the bending moment in step S2 and the section properties in step S4, combined with the mechanical properties of the material, calculate the actual safety factor of the upper beam under the current plate thickness.

[0013] S6: Determine and output the result: If the actual safety factor is greater than the set safety factor: directly output the current plate thickness parameter t; if not: return to step S4, select a larger plate thickness, and repeat the subsequent process until the safety factor requirement is met.

[0014] According to embodiments of this application, the basic parameters of the elevator include elevator load capacity, elevator width, decoration weight, elevator self-weight, and elevator model.

[0015] According to an embodiment of this application, the cross-sectional properties of the upper beam include the moment of inertia and the section modulus of bending.

[0016] According to an embodiment of this application, step S2 further includes the following steps:

[0017] S41: Calculate the maximum bending moment Mmax experienced by the upper beam.

[0018]

[0019] Where P is the self-weight of the elevator car, Q is the load capacity of the car, K is the decorative weight of the car, and L is the width of the car.

[0020] S42: Calculate the bending modulus Wx of the upper beam.

[0021] According to an embodiment of this application, step S5 specifically includes the following steps:

[0022] S51: Calculate bending stress σ:

[0023]

[0024] Where Wx is the bending modulus of the upper crossbeam, and Mmax is the maximum bending moment experienced by the upper crossbeam.

[0025] S52: Calculate the safety factor n:

[0026]

[0027] The calculated safety factor is used to compare with the set safety factor.

[0028] According to an embodiment of this application, the upper crossbeam is suspended by traction steel wire ropes, and both ends bear the weight of the car itself and the passenger load.

[0029] According to embodiments of this application, the mechanical properties of the material include the ultimate strength of the material.

[0030] According to an embodiment of this application, the upper crossbeam is a single-return rope sheave structure. In step S2, the bending moment on the upper crossbeam is calculated by combining the input elevator basic parameters with the force structure of the single-return rope sheave upper crossbeam.

[0031] According to another aspect of this application, a computer program product is provided, comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, enable the computer to perform the aforementioned optimization method for obtaining the thickness of the material of an elevator upper beam.

[0032] According to another aspect of this application, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the above-described optimization method for obtaining the thickness of the material of an elevator upper beam.

[0033] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0034] The optimized method for obtaining the material thickness of the elevator upper beam of this application is a loop of "input → calculate bending moment → set safety factor → select plate thickness → calculate safety factor → judge output" until the actual safety factor is greater than or equal to the set safety factor, and the minimum plate thickness t that meets the strength requirement is output. The specific beneficial effects are as follows:

[0035] 1. Input specific parameters (elevator model, lifting height, load capacity, decoration weight, etc.) and the system will automatically calculate the material thickness of the upper beam to meet the set safety factor, avoiding over-design and resource redundancy.

[0036] 2. When designing lightweight components, it is only necessary to change the set safety factor value or set the safety factor value in sections, and there is no need to worry about failing the 125% rated load braking test; simply setting the safety factor can complete the cost reduction design, accurately control product performance, and reduce the impact on customer experience.

[0037] 3. For items exceeding the range and decoration weight, no professional technicians are required to calculate them, and non-standard items are not required; the system can automatically calculate them based on the parameters. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0039] Figure 1This is a flowchart illustrating the steps of an optimized method for obtaining the material thickness of an elevator upper beam, as exemplified by the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a,” and similar terms, do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0042] according to Figure 1 As shown in the example, this application provides an optimized method for obtaining the material thickness of an elevator upper beam, which specifically includes the following steps:

[0043] S1: Determine input and output parameters: Set the elevator basic parameters as input parameters, and set the plate thickness of the upper crossbeam drawing as output parameter t.

[0044] Specifically, the basic parameters of an elevator include its load capacity, width, decorative weight, self-weight, and model.

[0045] S2: Calculate the bending moment borne by the upper beam: Based on the input elevator basic parameters, calculate the bending moment it experiences during operation.

[0046] Specifically, the upper crossbeam of the passenger elevator car frame is suspended by traction steel wire ropes, and both ends bear the weight of the car and the passenger load. The upper crossbeam is a single-return rope sheave structure. In step S2, the bending moment on the upper crossbeam is calculated by using the input elevator basic parameters and the force structure of the upper crossbeam of the single-return rope sheave.

[0047] Specifically, step S2 includes the following steps:

[0048] S41: Calculate the maximum bending moment Mmax on the upper beam. The calculation formula is as follows:

[0049]

[0050] Where P is the self-weight of the elevator car, Q is the load capacity of the car, K is the decorative weight of the car, and L is the width of the car.

[0051] S42: Calculate the bending modulus Wx of the upper beam.

[0052] S3: Set safety factor: Based on the safety standards or design specifications of the elevator industry, pre-set the safety factor required for the upper beam.

[0053] S4: Select initial plate thickness and corresponding section properties: Starting from the minimum thickness, select the material thickness of the upper beam and determine the corresponding upper beam section properties.

[0054] Specifically, the cross-sectional properties of the upper beam include the moment of inertia and the section modulus of bending.

[0055] S5: Calculate the actual safety factor: Using the bending moment from step S2 and the section properties from step S4, combined with the mechanical properties of the material, calculate the actual safety factor of the upper beam under the current plate thickness.

[0056] Specifically, step S5 includes the following steps:

[0057] S51: Calculate the bending stress σ using the following formula:

[0058]

[0059] Where Wx is the bending modulus of the upper crossbeam, and Mmax is the maximum bending moment experienced by the upper crossbeam.

[0060] S52: Calculate the safety factor n, using the following formula:

[0061]

[0062] The calculated safety factor is used to compare with the set safety factor.

[0063] S6: Determine and output the result: If the actual safety factor is greater than the set safety factor: directly output the current plate thickness parameter t; if not: return to step S4, select a larger plate thickness, and repeat the subsequent process until the safety factor requirement is met.

[0064] Specifically, the mechanical properties of a material include its ultimate strength.

[0065] Another aspect of this application discloses a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, which, when executed by a computer, enable the computer to perform an optimization method for obtaining the thickness of the material of an elevator upper beam as described above.

[0066] Another aspect of this application discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the above-described optimized method for obtaining the material thickness of an elevator upper beam.

[0067] Example 1: Optimization of the thickness of the upper beam of a heavy-duty passenger elevator

[0068] A passenger elevator has a load capacity Q = 1050 kg. The elevator car width can be selected within the range of [1100, 2100]. The elevator's self-weight is P = 1000 kg, and the decorative weight K ranges from [0, 200] kg. The material is Q235A with a material strength of 370 MPa. The upper crossbeam has a single-return rope pulley structure. The upper crossbeam is calculated and verified based on fatigue load. According to the mechanical design manual, the fatigue load safety factor n ≥ 7.

[0069] The crossbeams on the passenger elevator car frame are suspended by traction steel wire ropes, and bear the weight of the car and the passenger load at both ends. They can be simplified as a simply supported beam for calculation, and the value of L can be directly taken as the width of the car.

[0070] The maximum bending moment on the upper beam is calculated using the following formula:

[0071]

[0072] The maximum bending moments calculated using the above formula for car widths of 1100mm, 1600mm, and 2100mm are shown in Table 1.

[0073] Car width L (mm) 1100 1600 2100 Load capacity Q (Kg) 1050 1050 1050 Decorative weight K (Kg) 0 0 200 Car weight P (kg) 1000 1000 1000 Maximum bending moment Mmax 5524750 8036000 11576250

[0074] Table 1

[0075] The cross-sectional properties of the upper beam are calculated, mainly the bending modulus Wx, as shown in Table 2.

[0076] Plate thickness t 4 4.5 5 6 Flexural modulus Wx 203887 230414 257175 311398 Performance percentage 65% 74% 83% 100%

[0077] Table 2

[0078] Calculate the bending stress σ:

[0079]

[0080] Calculate the safety factor n

[0081]

[0082] A B C Car width L (mm) 1100 1600 2100 Load capacity Q (Kg) 1050 1050 1050 Decorative weight K (Kg) 0 0 200 Car weight P (kg) 1000 1000 1000 When t=4, n 13.66 9.39 6.52 At t=4.5, n 15.43 10.61 7.36 When t=5, n 17.22 11.84 8.22 When t=6, n 20.85 14.34 9.95

[0083] Table 3

[0084] Within the standard range of existing technical solutions, the thickness of the upper crossbeam is 6, and the minimum safety factor is 7. In Table 3, when the thickness of the upper crossbeam is 6, the safety factors for cases A and C are 9.95 and 20.85, respectively, both greater than 7. For case C, n=9.95, which leaves a certain safety redundancy relative to the minimum safety factor design. For case A, when t=6, n=20.85, and when t=4, n=13.66, both with safety factors much greater than 7. The design in this case is obviously over-designed.

[0085] According to the scheme in this application, the system safety factor is set to 9.95, which is consistent with the minimum safety factor requirement of the initial product design. For case A, the calculation starts from the minimum plate thickness t=4, using the above calculation formula. The resulting safety factor is compared with the system's set safety factor. If it meets the setting, t=4 is output. For case B, the calculation starts from the minimum plate thickness t=4. If it does not meet the setting, t=4.5 is selected again, and the calculation meets the setting. t=4.5 is output. Case C is calculated similarly. This allows for dynamic adjustment of the upper crossbeam material thickness to achieve optimal design. This technical solution makes full use of materials, achieving lightweight components while fully meeting performance requirements. If L and K are outside the range, under existing technical solutions, professionals need to recalculate and verify the upper crossbeam strength based on the actual L and K data. According to this patent scheme, by inputting the actual L and K data, the upper crossbeam plate thickness can be automatically obtained, eliminating the need for professional recalculation and increasing response speed.

[0086] It is understood that this application describes an optimization method for obtaining the material thickness of an elevator upper beam using a computer device. This computer device may include a processor and a memory, wherein the processor and memory operate in conjunction with each other through a software program. The processor can call logical instructions in the memory to obtain the optimization method for the material thickness of the elevator upper beam. This method includes: taking an existing drawing of the upper beam of a single-return sheave and setting the plate thickness as the output parameter t; calculating the bending moment on the upper beam based on the input elevator basic parameters; setting a safety factor; selecting the material thickness of the upper beam (starting from the minimum thickness) and the corresponding cross-sectional properties of the upper beam; calculating the actual safety factor; if the actual safety factor is greater than the safety factor, outputting the plate thickness parameter; otherwise, returning to the plate thickness selection process. Furthermore, the aforementioned logical instructions in the memory can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0087] On the other hand, the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, and when the program instructions are executed by the computer, the computer can execute the above-mentioned optimization method for obtaining the material thickness of the elevator upper beam. The method includes: taking the existing upper beam drawing of the single-return sheave and setting the plate thickness as the output parameter t; calculating the bending moment on the upper beam according to the input basic elevator parameters; setting a safety factor; selecting the material thickness of the upper beam (starting from the minimum thickness) and the corresponding upper beam section properties; calculating the actual safety factor; if it is greater than the safety factor, then outputting the plate thickness parameter; otherwise, returning to the plate thickness selection process.

[0088] In another aspect, the present invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the navigation and guidance methods provided above. The method includes: taking an existing drawing of the upper crossbeam of a single-return sheave and setting the plate thickness as the output parameter t; calculating the bending moment on the upper crossbeam based on the input elevator basic parameters; setting a safety factor; selecting the material thickness of the upper crossbeam (starting from the minimum thickness) and the corresponding crossbeam section properties; calculating the actual safety factor; if it is greater than the safety factor, outputting the plate thickness parameter; otherwise, returning to the plate thickness selection process.

[0089] In summary, the technical solution of this application has the following beneficial effects:

[0090] The optimized method for obtaining the material thickness of the elevator upper beam of this application is a loop of "input → calculate bending moment → set safety factor → select plate thickness → calculate safety factor → judge output" until the actual safety factor is greater than or equal to the set safety factor, and the minimum plate thickness t that meets the strength requirement is output. The specific beneficial effects are as follows:

[0091] 1. Input specific parameters (elevator model, lifting height, load capacity, decoration weight, etc.) and the system will automatically calculate the material thickness of the upper beam to meet the set safety factor, avoiding over-design and resource redundancy.

[0092] 2. When designing lightweight components, it is only necessary to change the set safety factor value or set the safety factor value in sections, and there is no need to worry about failing the 125% rated load braking test; simply setting the safety factor can complete the cost reduction design, accurately control product performance, and reduce the impact on customer experience.

[0093] 3. For items exceeding the range and decoration weight, no professional technicians are required to calculate them, and non-standard items are not required; the system can automatically calculate them based on the parameters.

[0094] The above are merely exemplary embodiments of this application and are not intended to limit the scope of protection of this application, which is determined by the appended claims.

Claims

1. An optimized method for obtaining the material thickness of an elevator upper beam, characterized in that, Includes the following steps: S1: Determine input and output parameters: Set the elevator basic parameters as input parameters, and set the plate thickness of the upper beam drawing as output parameter t; S2: Calculate the bending moment borne by the upper beam: Based on the input elevator basic parameters, calculate the bending moment it experiences during operation. S3: Set safety factor: Based on the safety standards or design specifications of the elevator industry, pre-set the safety factor required for the upper beam; S4: Select initial plate thickness and corresponding section properties: Starting from the minimum thickness, select the material thickness of the upper beam and determine the corresponding upper beam section properties; S5: Calculate the actual safety factor: Using the bending moment in step S2 and the section properties in step S4, combined with the mechanical properties of the material, calculate the actual safety factor of the upper beam under the current plate thickness. S6: Determine and output the result: If the actual safety factor is greater than the set safety factor: directly output the current plate thickness parameter t; if not: return to step S4, select a larger plate thickness, and repeat the subsequent process until the safety factor requirement is met.

2. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, The basic parameters of the elevator include elevator load capacity, elevator width, decoration weight, elevator self-weight, and elevator model.

3. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, The cross-sectional properties of the upper beam include the moment of inertia and the section modulus of bending.

4. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, Furthermore, step S2 specifically includes the following steps: S41: Calculate the maximum bending moment M experienced by the upper beam. max : ； Where P is the self-weight of the elevator car, Q is the load capacity of the car, K is the decorative weight of the car, and L is the width of the car. S42: Calculate the bending modulus Wx of the upper beam.

5. An optimized method for obtaining the material thickness of an elevator upper beam according to claim 4, characterized in that, Step S5 specifically includes the following steps: S51: Calculate bending stress σ: ； Where Wx is the flexural modulus of the upper crossbeam, and M... max This represents the maximum bending moment experienced by the upper crossbeam. S52: Calculate the safety factor n: ； The calculated safety factor is used to compare with the set safety factor.

6. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, The upper crossbeam is suspended by traction steel wire ropes, and its two ends bear the weight of the car itself and the passenger load.

7. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, The mechanical properties of the material include its ultimate strength.

8. The optimized method for obtaining the material thickness of an elevator upper beam according to claim 1, characterized in that, The upper crossbeam is a single-return rope sheave structure. In step S2, the bending moment on the upper crossbeam is calculated by combining the input elevator basic parameters with the force structure of the single-return rope sheave upper crossbeam.

9. A computer program product, characterized in that, The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, enable the computer to perform an optimization method for obtaining the thickness of the material of an elevator upper beam as described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements an optimized method for obtaining the material thickness of an elevator upper beam as described in any one of claims 1-8.

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