Method and device for evaluating the structural strength of a vertical transfer frame

Abstract

The present disclosure provides a method for evaluating the structural strength of a vertical transfer frame, comprising: determining a stress test area of the vertical transfer frame, collecting dynamic strain data of the stress test area; calculating a maximum principal strain value and a minimum principal strain value respectively according to the dynamic strain data; establishing a simulation analysis model of the vertical transfer frame, applying boundary conditions to simulate limit working conditions on the simulation analysis model according to the maximum principal strain value and the minimum principal strain value, and obtaining analysis data; extracting evaluation parameters of the vertical transfer frame according to the analysis data, and evaluating the structural strength of the vertical transfer frame according to the evaluation parameters. The method applies boundary conditions to the simulation model to obtain evaluation parameters of the vertical transfer frame, and evaluates the structural strength of the vertical transfer frame. The structural strength evaluation method can avoid the blindness of traditional engineering design, realize comprehensive and accurate evaluation of the structural strength in combination with different test conditions, and shorten the research and design cycle of the vertical transfer frame.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of structural strength evaluation of vertical transfer frame, and more particularly to a structural strength evaluation method and device of vertical transfer frame. BACKGROUND

[0002] Transfer frame is increasingly widely used in fine design of material storage space, such as household garbage transfer frame, stereo garage transfer frame, etc. According to different operation modes, the transfer frame is generally divided into horizontal type and vertical type, and the vertical transfer frame gradually becomes the industry mainstream due to the advantages of small land occupation and high operation efficiency. The vertical transfer frame mainly includes a motor, a speed reduction transmission chain, a circulating transmission chain, a vertical transfer frame, a hanging basket and a chain wheel.

[0003] When the vertical transfer frame is operating, the circulating transmission chain drives the hanging basket to be periodically lifted and lowered, and the vertical transfer frame always bears dynamic cyclic load. At the same time, due to the particularity of the vertical layout of the circulating transmission chain, when the fully loaded hanging basket passes directly below the lower end chain wheel, the vertical transfer frame will bear obvious eccentric load, so the structural strength evaluation of the vertical transfer frame is of great significance to the structural design and safety performance of the vertical transfer frame. In the related art, the evaluation method for eccentric load mainly adopts static stress analysis and modal analysis, and in order to consider the influence of eccentric load and dynamic cyclic load, the working condition requirements of the vertical transfer frame bearing dynamic cyclic load cannot be met, and there are disadvantages of inaccurate structural strength evaluation and large design error. SUMMARY

[0004] In view of the above problems, the present disclosure provides a structural strength evaluation method and device of vertical transfer frame.

[0005] According to a first aspect of the present disclosure, a structural strength evaluation method of vertical transfer frame is provided, comprising:

[0006] determining a stress test area of the vertical transfer frame, and collecting dynamic strain data of the stress test area;

[0007] According to the dynamic strain data, the maximum principal strain value and the minimum principal strain value are calculated respectively;

[0008] establishing a simulation analysis model of the vertical transfer frame, applying boundary conditions on the simulation analysis model to simulate limit working conditions according to the maximum principal strain value and the minimum principal strain value, and obtaining analysis data; and

[0009] According to the analysis data, the evaluation parameters of the vertical transfer frame are extracted, and the structural strength of the vertical transfer frame is evaluated according to the evaluation parameters.

[0010] According to an embodiment of the present disclosure, the determining the stress test area of the vertical transfer frame comprises:

[0011] establishing a finite element test model of the vertical transfer frame;

[0012] loading a rated load into the finite element test model, and calculating a stress concentration area of the finite element model;

[0013] determining the stress test area according to the stress concentration area.

[0014] According to an embodiment of the present disclosure, the dynamic strain data comprises dynamic strain data in an unloaded working condition and dynamic strain data in a loaded working condition;

[0015] The collecting the dynamic strain data of the stress test area comprises:

[0016] arranging strain sensors on upper surfaces, lower surfaces and side surfaces of the stress test area, respectively;

[0017] determining that the vertical transfer frame is in the unloaded working condition, and collecting the dynamic strain data of the strain sensors in the unloaded working condition, respectively;

[0018] determining that the vertical transfer frame is in the loaded working condition, and collecting the dynamic strain data of the strain sensors in the loaded working condition, respectively.

[0019] According to an embodiment of the present disclosure, the strain sensor arranged on the lower surface of the stress test area is a right-angle strain gauge; a 45° direction of the right-angle strain gauge is parallel to a length direction of the stress test area, a 0° direction of the right-angle strain gauge points to an outer side of the stress test area, and a 90° direction of the right-angle strain gauge points to an inner side of the stress test area.

[0020] According to an embodiment of the present disclosure, the strain sensor arranged on the upper surface of the stress test area is a uniaxial strain gauge; an axial direction of the uniaxial strain gauge is parallel to the length direction of the stress test area.

[0021] According to an embodiment of the present disclosure, the calculating the maximum principal strain value and the minimum principal strain value according to the dynamic strain data comprises:

[0022] obtaining the dynamic strain data in the unloaded working condition, and calculating the maximum principal strain value in the unloaded working condition according to the following formula,

[0023]

[0024] obtaining the dynamic strain data in the unloaded working condition, and calculating the minimum principal strain value in the unloaded working condition according to the following formula,

[0025]

[0026] wherein ε1 represents the maximum principal strain value under no load, ε2 represents the minimum principal strain value under no load, ε0 represents the tensile stress under no load in the 0° direction of the strain sensor, ε90 represents the compressive stress under no load in the 90° direction of the strain sensor, and ε45 represents the tensile stress under no load in the 45° direction of the strain sensor. 90 wherein ε1 represents the maximum principal strain value under no load, ε2 represents the minimum principal strain value under no load, ε0 represents the tensile stress under no load in the 0° direction of the strain sensor, ε90 represents the compressive stress under no load in the 90° direction of the strain sensor, and ε45 represents the tensile stress under no load in the 45° direction of the strain sensor. 45 wherein ε1 represents the maximum principal strain value under no load, ε2 represents the minimum principal strain value under no load, ε0 represents the tensile stress under no load in the 0° direction of the strain sensor, ε90 represents the compressive stress under no load in the 90° direction of the strain sensor, and ε45 represents the tensile stress under no load in the 45° direction of the strain sensor.

[0027] The dynamic strain data under the load condition is obtained, and the maximum principal strain value under the load is calculated according to the following formula,

[0028]

[0029] The dynamic strain data under the load condition is obtained, and the minimum principal strain value under the load is calculated according to the following formula,

[0030]

[0031] wherein ε1' represents the maximum principal strain value under the load, ε2' represents the minimum principal strain value under the load, ε0' represents the tensile stress in the 0° direction of the strain sensor under the load, ε90' represents the compressive stress in the 90° direction of the strain sensor under the load, and ε45' represents the tensile stress in the 45° direction of the strain sensor under the load.

[0032] According to an embodiment of the present disclosure, the evaluation parameters include maximum stress, maximum stress position, yield strength, stress distribution trend, and safety factor.

[0033] A second aspect of the present disclosure provides a device for evaluating the structural strength of a vertical transfer frame, comprising:

[0034] A collection module is configured to determine a stress test area of the vertical transfer frame and collect dynamic strain data of the stress test area.

[0035] A calculation module is configured to calculate a maximum principal strain value and a minimum principal strain value respectively according to the dynamic strain data.

[0036] A simulation module is configured to establish a simulation analysis model of the vertical transfer frame, apply boundary conditions to simulate limit conditions on the simulation analysis model according to the maximum principal strain value and the minimum principal strain value, and obtain analysis data.

[0037] An evaluation module is configured to extract evaluation parameters of the vertical transfer frame according to the analysis data and evaluate the structural strength of the vertical transfer frame according to the evaluation parameters.

[0038] The third aspect of the present disclosure provides an electronic device, comprising: one or more processors; a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors perform the structural strength evaluation method of the vertical transfer frame.

[0039] The fourth aspect of the present disclosure further provides a computer-readable storage medium having stored thereon executable instructions that, when executed by a processor, cause the processor to perform the structural strength evaluation method of the vertical transfer frame.

[0040] The fifth aspect of the present disclosure further provides a computer program product comprising a computer program that, when executed by a processor, implements the structural strength evaluation method of the vertical transfer frame.

[0041] With the method provided by the embodiments of the present disclosure, the boundary conditions are applied on the simulation analysis model based on the maximum principal strain value and the minimum principal strain value to simulate the limit working condition, and the evaluation parameters of the vertical transfer frame are obtained, and then the structural strength of the vertical transfer frame is evaluated. The structural strength evaluation method can avoid the blindness of the traditional engineering design, realize the comprehensive and accurate evaluation of the structural strength in combination with different test working conditions, and shorten the research and development design cycle of the vertical transfer frame. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] The above and other objects, features and advantages of the present disclosure will become more apparent from the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0044] Figure 1 A schematic diagram of a vertical transfer frame according to an embodiment of the present disclosure is schematically shown;

[0045] Figure 2 An application scenario diagram of a structural strength evaluation method, device, equipment, medium and program product of a vertical transfer frame according to an embodiment of the present disclosure is schematically shown;

[0046] Figure 3 A flowchart of a structural strength evaluation method of a vertical transfer frame according to an embodiment of the present disclosure is schematically shown;

[0047] Figure 4 A flowchart of determining a stress test area of a vertical transfer frame according to an embodiment of the present disclosure is schematically shown;

[0048] Figure 5 A finite element test model of the vertical transfer frame according to an embodiment of the present disclosure is schematically shown;

[0049] Figure 6 A flowchart of collecting dynamic strain data of the stress test area according to an embodiment of the present disclosure is schematically shown;

[0050] Figure 7 A layout diagram of the strain sensors of the stress test area according to an embodiment of the present disclosure is schematically shown;

[0051] Figure 8 A right-angle strain gauge arrangement angle diagram of the lower surface of the stress test area according to an embodiment of the present disclosure is schematically shown;

[0052] Figure 9 A flowchart of calculating the maximum principal strain value and the minimum principal strain value respectively according to the dynamic strain data according to an embodiment of the present disclosure is schematically shown;

[0053] Figure 10 A structural block diagram of the structural strength evaluation device of the vertical transfer frame according to an embodiment of the present disclosure is schematically shown; and

[0054] Figure 11 A block diagram of the electronic device suitable for implementing the structural strength evaluation method of the vertical transfer frame according to an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0055] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood, however, that the description is merely exemplary and is not intended to limit the scope of the present disclosure. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of embodiments of the present disclosure. However, it would be apparent to those skilled in the art that one or more embodiments can be practiced without these specific details. In other instances, well-known structures and techniques have been not described in detail in order to avoid obscuring aspects of the present disclosure.

[0056] The terms used herein are merely used to describe specific embodiments and are not intended to limit the present disclosure. The terms "include", "comprise", and the like used herein indicate the presence of the described features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0057] In order to facilitate understanding of the technical solutions of the present disclosure, the following terms are explained:

[0058] The vertical transfer frame, such as Figure 1As shown, mainly includes: motor 1, reduction drive chain 2, circulating drive chain 3, vertical transfer frame 4, hanging basket 5, sprocket 6 and so on. Vertical transfer frame can be applied to vertical garbage transfer site, vertical garage and other guiding devices, through motor operation to drive reduction drive chain and circulating drive chain to realize the function of up and down transfer transportation.

[0059] All terms used herein, including technical and scientific terms, have the meanings commonly understood by one of ordinary skill in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having meanings consistent with the context of the present specification, and should not be interpreted in an idealized or overly formal manner.

[0060] In the case of using expressions similar to "at least one of A, B, and C, etc.", in general, it should be interpreted that the meaning of the expression is at least one of A, at least one of B, and at least one of C (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, a system having B alone, a system having C alone, a system having both A and B, a system having both A and C, a system having both B and C, and / or a system having A, B, and C, etc.).

[0061] The embodiment of the present disclosure provides a structure strength evaluation method of a vertical transfer frame, comprising: determining a stress test area of the vertical transfer frame, collecting dynamic strain data of the stress test area; calculating a maximum principal strain value and a minimum principal strain value respectively according to the dynamic strain data; establishing a simulation analysis model of the vertical transfer frame; applying boundary conditions to simulate limit working conditions on the simulation analysis model according to the maximum principal strain value and the minimum principal strain value, and obtaining analysis data; extracting evaluation parameters of the vertical transfer frame according to the analysis data, and evaluating the structure strength of the vertical transfer frame according to the evaluation parameters.

[0062] By using the method provided by the embodiment of the present disclosure, the boundary conditions are applied to simulate the limit working conditions on the simulation analysis model based on the maximum principal strain value and the minimum principal strain value, the evaluation parameters of the vertical transfer frame are obtained, and the structure strength of the vertical transfer frame is evaluated by using the evaluation parameters. The structure strength evaluation method can avoid the blindness of traditional engineering design, realize comprehensive and accurate evaluation of the structure strength in combination with different test working conditions, and shorten the research and development design cycle of the vertical transfer frame.

[0063] Figure 2 The application scenario diagram of the structure strength evaluation method, device, equipment, medium and program product of the vertical transfer frame according to the embodiment of the present disclosure is schematically shown. It should be noted that, Figure 1 The shown is only an application example to which the embodiment of the present disclosure can be applied, to help those skilled in the art understand the technical content of the present disclosure, but does not mean that the embodiment of the present disclosure cannot be applied to other devices, systems, environments or scenarios.

[0064] As Figure 2As shown, the application scenario 100 according to this embodiment can include terminal devices 101, 102, 103, a network 104, and a server 105. The network 104 is a medium for providing a communication link between the terminal devices 101, 102, 103 and the server 105. The network 104 can include various connection types, such as wired, wireless communication links, or fiber optic cables, and the like.

[0065] A user can use the terminal devices 101, 102, 103 to interact with the server 105 through the network 104 to receive or send messages, and the like. Various communication client applications can be installed on the terminal devices 101, 102, 103, such as shopping applications, web browser applications, search applications, instant messaging tools, email clients, social platform software, and the like (only as examples).

[0066] The terminal devices 101, 102, 103 can be various electronic devices with display screens and supporting web browsing, including but not limited to smartphones, tablet computers, laptop computers, desktop computers, and the like.

[0067] The server 105 can be a server providing various services, such as a background management server providing support for websites browsed by users using the terminal devices 101, 102, 103 (only as an example). The background management server can analyze and process received user requests and the like, and feed back the processing results (such as web pages, information, or data, and the like obtained or generated according to user requests) to the terminal devices.

[0068] It should be noted that the method for evaluating the structural strength of the vertical transfer frame provided by the embodiments of the present disclosure can generally be executed by the server 105. Accordingly, the apparatus for evaluating the structural strength of the vertical transfer frame provided by the embodiments of the present disclosure can generally be arranged in the server 105. The method for evaluating the structural strength of the vertical transfer frame provided by the embodiments of the present disclosure can also be executed by a server or a server cluster different from the server 105 and capable of communicating with the terminal devices 101, 102, 103 and / or the server 105. Accordingly, the apparatus for evaluating the structural strength of the vertical transfer frame provided by the embodiments of the present disclosure can also be arranged in a server or a server cluster different from the server 105 and capable of communicating with the terminal devices 101, 102, 103 and / or the server 105.

[0069] For example, the collection of dynamic strain data of the stress test area can be originally stored in any one of the terminal devices 101, 102 or 103 (for example, the terminal device 101, but not limited thereto), or on an external storage device and can be imported into the terminal device 101. Then, the terminal device 101 can send the collected dynamic strain data to other terminal devices, servers, or server clusters, and the structural strength evaluation method of the vertical transfer framework provided by the embodiments of the present disclosure is executed by other servers or server clusters receiving the dynamic strain data.

[0070] It should be understood that Figure 2 The number of terminal devices, networks and servers in the above-mentioned scenario is only illustrative. Any number of terminal devices, networks and servers can be provided according to the needs of implementation.

[0071] The structural strength evaluation method of the vertical transfer framework according to the embodiments of the present disclosure will be described in detail below based on the scenario described above. Figure 2 The structural strength evaluation method of the vertical transfer framework according to the embodiments of the present disclosure will be described in detail below based on the scenario described above. Figures 3-11 The structural strength evaluation method of the vertical transfer framework according to the embodiments of the present disclosure will be described in detail below based on the scenario described above.

[0072] Figure 3 A flowchart of the structural strength evaluation method of the vertical transfer framework according to the embodiments of the present disclosure is schematically shown.

[0073] As shown in Figure 3 The structural strength evaluation method of the vertical transfer framework according to the embodiments of the present disclosure includes operations S210-S250.

[0074] In operation S210, a stress test area of the vertical transfer framework is determined, and dynamic strain data of the stress test area is collected.

[0075] In operation S220, according to the dynamic strain data, the maximum principal strain value and the minimum principal strain value are calculated respectively.

[0076] In operation S230, a simulation analysis model of the vertical transfer framework is established, boundary conditions are applied on the simulation analysis model to simulate limit working conditions according to the maximum principal strain value and the minimum principal strain value, and analysis data is obtained.

[0077] In operation S240, evaluation parameters of the vertical transfer framework are extracted according to the analysis data, and the structural strength of the vertical transfer framework is evaluated according to the evaluation parameters.

[0078] According to the embodiments of the present disclosure, the above-mentioned evaluation parameters include: maximum stress, maximum stress position, yield strength, stress distribution trend and safety factor.

[0079] By determining the stress test area of the vertical transfer frame, dynamic strain data of the vertical transfer frame during dynamic cycle operation is collected, the load bearing law of the frame is analyzed by applying the dynamic strain data collected by the test method, and a finite element simulation model with high confidence is further established, and finally the structural strength of the frame is comprehensively and accurately evaluated by using the finite element simulation model.

[0080] Figure 4 A flowchart of determining the stress test area of the vertical transfer frame according to an embodiment of the present disclosure is schematically shown.

[0081] As Figure 4 shown, the determining the stress test area of the vertical transfer frame of the embodiment includes operation S211 to operation S213.

[0082] In operation S211, a finite element test model of the vertical transfer frame is established.

[0083] In operation S212, the rated load is loaded into the finite element test model, and the stress concentration area of the finite element model is calculated and determined.

[0084] In operation S213, the stress test area is determined according to the stress concentration area.

[0085] Figure 5 A finite element test model of the vertical transfer frame according to an embodiment of the present disclosure is schematically shown.

[0086] According to an embodiment of the present disclosure, in order to obtain significant test data, a test area with relatively large stress in the finite element analysis result is generally selected for strain measurement. In the present embodiment, a preliminary analysis is performed on the vertical transfer frame shown in Figure 1 The vertical transfer frame is a vertical cycle type garbage transfer station, the hanging beam has five, the self weight of a single hanging basket is 150 Kg, the maximum load of a single hanging basket is 200 Kg, the limit working condition is that three hanging baskets on one side are fully loaded and two hanging baskets on the other side are empty; the frame material is Q235, and the yield strength is 235 Mpa. Based on the above conditions, the finite element test model shown in Figure 5 is established, the limit working condition and the boundary condition are set for the finite element test model, the rated load is loaded into the finite element test model, and the analysis result is obtained by means of the analysis software. According to the above preliminary finite element analysis, the area with relatively large stress of the frame is the upper cross beam 7 and the lower cross beam 8, and the stress of the lower cross beam 8 is greater than that of the upper cross beam 7 due to the lack of the motor mounting bracket of the upper cross beam 7, so the lower cross beam 8 should be the key attention area for strain test. Therefore, the stress concentration area of the lower cross beam is determined as the stress test area.

[0087] By establishing the finite element test model, the stress test area is preliminarily determined, the accuracy of the stress test is improved, and the blindness of the stress test data acquisition is avoided.

[0088] Figure 6 A flowchart of collecting dynamic strain data of the stress test area according to an embodiment of the present disclosure is shown schematically.

[0089] The dynamic strain data includes dynamic strain data in an unloaded working condition and dynamic strain data in a loaded working condition.

[0090] As shown in the embodiment, collecting dynamic strain data of the stress test area includes operations S214-S216. Figure 6

[0091] In operation S214, the strain sensors 9 are arranged on the upper surface, the lower surface and the side surface of the stress test area, respectively.

[0092] In operation S215, it is determined that the vertical transfer frame is in the unloaded working condition, and the dynamic strain data of the strain sensors 9 in the unloaded working condition is collected, respectively.

[0093] In operation S216, it is determined that the vertical transfer frame is in the loaded working condition, and the dynamic strain data of the strain sensors 9 in the loaded working condition is collected, respectively.

[0094] Figure 7 A layout diagram of the strain sensors of the stress test area according to an embodiment of the present disclosure is shown schematically.

[0095] According to an embodiment of the present disclosure, referring to the analysis results of the stress test area of the finite element test model, the strain sensors 9 are arranged on the upper and lower surfaces of the frame of the lower crossbeam 8, respectively, for example, in the embodiment, eight strain sensors 9 are arranged on the lower surface and the upper surface of the frame of the lower crossbeam 8 of the stress test area, respectively, and four strain sensors 9 are arranged on the four corner positions of the side surface of the stress test area, respectively. The measuring point positions of the strain sensors 9 are symmetrical about the upper and lower surfaces, as shown in the embodiment. Figure 8 Due to the perspective direction, the strain sensors 9 on the lower surface are not drawn.

[0096] Since the vertical transfer frame always bears dynamic cyclic load during the transfer operation, and considering the particularity of the vertical layout of the transmission chain, when the full-load hanging basket passes directly below the lower end sprocket, the frame will bear obvious eccentric load. As the main load-bearing component of the transfer station, the structural strength of the frame is of great significance to the safety performance of the transfer station. When evaluating the strength of the frame, the influence of the eccentric load and the dynamic cyclic load is considered comprehensively, which can improve the confidence of the structural strength evaluation of the vertical transfer frame and improve the accuracy of the evaluation.

[0097] Figure 8 A right-angle strain rosette arrangement angle schematic diagram of the lower surface of the stress test area according to an embodiment of the present disclosure is shown schematically.

[0098] ​According to an embodiment of the present disclosure, the strain sensor arranged on the lower surface of the stress test area can be a right-angle strain gauge; the 45° direction of the right-angle strain gauge is parallel to the length direction of the stress test area, the 0° direction of the right-angle strain gauge points to the outside of the stress test area, and the 90° direction of the right-angle strain gauge points to the inside of the stress test area.

[0099] According to an embodiment of the present disclosure, the strain sensor arranged on the upper surface of the stress test area can be a uniaxial strain gauge; the axial direction of the uniaxial strain gauge is parallel to the length direction of the stress test area.

[0100] Figure 9 A flowchart for calculating the maximum principal strain value and the minimum principal strain value respectively according to dynamic strain data according to an embodiment of the present disclosure is schematically shown.

[0101] According to an embodiment of the present disclosure, calculating the maximum principal strain value and the minimum principal strain value respectively according to dynamic strain data includes operation S221 to operation S224.

[0102] In operation S221, the dynamic strain data under the no-load condition is obtained, and the maximum principal strain value under the no-load condition is calculated according to the following formula,

[0103]

[0104] In operation S222, the dynamic strain data under the no-load condition is obtained, and the minimum principal strain value under the no-load condition is calculated according to the following formula,

[0105]

[0106] wherein ε1 represents the maximum principal strain value under the no-load condition, ε2 represents the minimum principal strain value under the no-load condition, ε0 represents the no-load tensile stress received by the 0° direction of the strain sensor, ε 90 represents the no-load compressive stress received by the 90° direction of the strain sensor, and ε 45 represents the no-load tensile stress received by the 45° direction of the strain sensor; when the strain sensor is a uniaxial strain gauge, the stresses of the 0° direction and the 90° direction are 0.

[0107] In operation S223, the dynamic strain data under the load condition is obtained, and the maximum principal strain value under the load condition is calculated according to the following formula,

[0108]

[0109] In operation S224, the dynamic strain data under the load condition is obtained, and the minimum principal strain value under the load condition is calculated according to the following formula,

[0110]

[0111] Wherein, ε1' represents the maximum principal strain value of load, ε2' represents the minimum principal strain value of load, ε0' represents the tensile stress of 0° direction of strain sensor, ε9'0 represents the compressive stress of 90° direction of strain sensor, and ε4'5 represents the tensile stress of 45° direction of strain sensor. When the strain sensor is a uniaxial strain gauge, the stress of 0° direction and 90° direction is 0.

[0112] The following is described in detail through specific examples.

[0113] For example, the test conditions are condition 1, no-load operation condition, and condition 2, load operation condition. In the no-load operation condition, the circulating transmission chain is hung with five baskets, each basket has a self weight of 150 Kg, and the circulating transmission chain is operated at the rated speed for more than one cycle. In the load operation condition, the circulating transmission chain is hung with five baskets, one of which is loaded with simulated garbage, and the weight of the simulated garbage is 112 Kg. In the load operation condition, the circulating transmission chain lifts the heavy basket to a certain height, reverses the motor, lifts the heavy basket to the other side of the frame, and finally lowers the heavy basket.

[0114] The dynamic strain data of the frame in the two typical conditions of no-load and load are collected by the test, and the maximum principal strain value and the minimum principal strain value are calculated respectively. According to the calculated maximum principal strain value and the minimum principal strain value, the boundary conditions are applied on the simulation analysis model to simulate the limit condition, and the analysis data are obtained. This method can obtain the stress distribution rule of the frame with high confidence through the simulation analysis model, and improves the structural strength precision of the vertical transfer frame.

[0115] The model of the acquisition instrument used in the test is 32-channel strain acquisition instrument DH3820, and the sampling frequency is 100 Hz.

[0116] In the no-load operation condition, the lower surface of the lower cross beam 8 is in a plane stress state, wherein the 0° direction of the right-angle strain gauge is in tension and the 90° direction is in compression; the maximum principal strain is 71.6 με ~ 98.2 με, and the minimum principal strain is -70.9 με ~ -98.0 με. In the load operation condition, the strain peak value is 152.1 με (tension) and -161.6 με (compression); compared with the no-load operation test, the strain amplitude increases by 40% ~ 64% in the load operation test.

[0117] The dynamic strain data of the two typical conditions of no-load and load during the operation of the vertical transfer frame are collected by the strain test, the high-confidence finite element simulation model is established through the test data correction, the limit condition of the frame is simulated in the finite element model, and the strength is further evaluated.

[0118] Since the load increases and the effective strain data increases when the load operation, the relative error of the test decreases, and thus the overall consistency of the simulation and the test is improved; the simulation-test error of the straight angle strain gauge measuring point on the lower surface of the cross beam is less than 7.35%; the minimum error of the strain gauge measuring point on the upper surface of the cross beam is 5.79%, and the trend of the simulation and the test is consistent; the simulation result is generally greater than the test result, which shows that the simulation model is beneficial to the strength checking of the frame.

[0119] The finite element model verified by the test data simulates the limit working condition of a certain vertical cycle type garbage transfer station, that is, three hanging baskets on one side are fully loaded, and two hanging baskets on the other side are empty, wherein the self weight of a single hanging basket is 150 Kg, and the full load of a single hanging basket is 200 Kg. Except for the stress distortion point, the maximum stress of the frame in the limit working condition is about 142 Mpa, and the maximum stress is located on the lower cross beam; the safety factor of the frame is 1.65 by using the material yield strength evaluation; the simulation model has engineering application significance through the dynamic strain data verification of the frame.

[0120] The structural strength evaluation method of the vertical transfer frame combines the strain test and the finite element analysis method closely, improves the structural strength evaluation precision of the vertical transfer frame, has engineering application significance, and can be expanded to the strength evaluation of other chain transmission vertical cycle type lifting mechanisms such as stereo garage.

[0121] Based on the structural strength evaluation method of the vertical transfer frame, the disclosure further provides a structural strength evaluation device of a vertical transfer frame. The following will be described in detail in combination with Figure 10 The device is described in detail.

[0122] Figure 10 A structural block diagram of a structural strength evaluation device of a vertical transfer frame according to an embodiment of the disclosure is schematically shown.

[0123] As Figure 10 shown, the structural strength evaluation device 300 of the vertical transfer frame of this embodiment includes an acquisition module 310, a calculation module 320, a simulation module 330 and an evaluation module 340.

[0124] The acquisition module 310 is used to determine a stress test area of the vertical transfer frame, and acquire dynamic strain data of the stress test area. In an embodiment, the acquisition module 310 can be used to perform the operation S210 described in the foregoing, which will not be described here again.

[0125] The calculation module 320 is used to calculate the maximum principal strain value and the minimum principal strain value respectively according to the dynamic strain data. In an embodiment, the calculation module 320 can be used to perform the operation S220 described in the foregoing, which will not be described here again.

[0126] The simulation module 330 is configured to establish a simulation analysis model of the vertical transfer frame, apply boundary conditions on the simulation analysis model to simulate limit working conditions according to the maximum principal strain value and the minimum principal strain value, and obtain analysis data. In an embodiment, the simulation module 330 can be configured to perform the operation S230 described above, and details are not repeated here.

[0127] The evaluation module 340 is configured to extract evaluation parameters of the vertical transfer frame according to the analysis data, and evaluate the structural strength of the vertical transfer frame according to the evaluation parameters. In an embodiment, the evaluation module 340 can be configured to perform the operation S240 described above, and details are not repeated here.

[0128] According to embodiments of the present disclosure, any one or more of the collection module 310, the calculation module 320, the simulation module 330, and the evaluation module 340 can be combined in one module, or any one of them can be split into multiple modules. Alternatively, at least part of the function of one or more of these modules can be combined with at least part of the function of other modules, and implemented in one module. According to embodiments of the present disclosure, at least one of the collection module 310, the calculation module 320, the simulation module 330, and the evaluation module 340 can be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on chip, a system on board, a system on package, an application specific integrated circuit (ASIC), or any other reasonable way of integrating or packaging a circuit, etc. hardware or firmware, or any one of software, hardware and firmware or any appropriate combination of several of them. Alternatively, at least one of the collection module 310, the calculation module 320, the simulation module 330, and the evaluation module 340 can be at least partially implemented as a computer program module that can perform corresponding functions when executed.

[0129] Figure 11 A block diagram of an electronic device suitable for implementing the structural strength evaluation method of the vertical transfer frame according to embodiments of the present disclosure is schematically shown.

[0130] As Figure 11As shown, the electronic device 400 according to embodiments of the present disclosure includes a processor 401, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 402 or loaded into a random access memory (RAM) 403 from a storage section 408. The processor 401 can include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor, and / or a related chipset, and / or a dedicated microprocessor (e.g., an application specific integrated circuit (ASIC)), and so on. The processor 401 can also include an on-board memory for cache use. The processor 401 can include a single processing unit or multiple processing units for performing the various actions of the method processes according to embodiments of the present disclosure.

[0131] In the RAM 403, various programs and data required for the operation of the electronic device 400 are stored. The processor 401, the ROM 402, and the RAM 403 are connected to each other via a bus 404. The processor 401 performs various operations of the method processes according to embodiments of the present disclosure by executing the programs in the ROM 402 and / or the RAM 403. Note that the programs can also be stored in one or more memories other than the ROM 402 and the RAM 403. The processor 401 can also perform various operations of the method processes according to embodiments of the present disclosure by executing the programs stored in the one or more memories.

[0132] According to embodiments of the present disclosure, the electronic device 400 can further include an input / output (I / O) interface 405, which is also connected to the bus 404. The electronic device 400 can further include one or more of the following components connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as necessary. A removable recording medium 411 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 410 as necessary, so that a computer program read therefrom is installed into the storage section 408 as necessary.

[0133] The present disclosure also provides a computer-readable storage medium, which can be included in the device / apparatus / system described in the above embodiments; or can exist separately without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, which when executed, implement the method according to embodiments of the present disclosure.

[0134] According to an embodiment of the present disclosure, the computer readable storage medium can be a nonvolatile computer readable storage medium, for example, can include but not limited to: a portable computer diskette, a hard disk, a random access memory (RAM), a read only memory (ROM), an erasable programmable read only memory (EPROM or flash memory), a portable compact disc read only memory (CD-ROM), an optical storage device, a magnetic storage device, or any appropriate combination thereof. In the present disclosure, the computer readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device. For example, according to an embodiment of the present disclosure, the computer readable storage medium can include the ROM 402 and / or the RAM 403 described above and / or one or more memory other than the ROM 402 and the RAM 403.

[0135] Embodiments of the present disclosure also include a computer program product, which includes a computer program containing program codes for executing the method shown in the flow chart. When the computer program product is run in a computer system, the program codes are used to make the computer system implement the structural strength evaluation method of the vertical transfer frame provided by the embodiments of the present disclosure.

[0136] The above functions defined in the system / device of the embodiments of the present disclosure are performed when the computer program is executed by the processor 401. According to an embodiment of the present disclosure, the system, device, module, unit, etc. described above can be implemented by computer program modules.

[0137] In one embodiment, the computer program can rely on tangible storage media such as optical storage media, magnetic storage media, etc. In another embodiment, the computer program can also be transmitted, distributed, and downloaded in the form of signals on a network medium, and be downloaded and installed through the communication part 409, and / or installed from the detachable medium 411. The program codes contained in the computer program can be transmitted by any appropriate network medium, including but not limited to: wireless, wired, etc., or any appropriate combination thereof.

[0138] In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 409, and / or installed from the detachable medium 411. When the computer program is executed by the processor 401, the above functions defined in the system of the embodiments of the present disclosure are performed. According to an embodiment of the present disclosure, the system, device, apparatus, module, unit, etc. described above can be implemented by computer program modules.

[0139] According to embodiments of this disclosure, program code for executing the computer programs provided in embodiments of this disclosure can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can execute entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0140] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0141] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments and / or claims of this disclosure can be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0142] The above describes embodiments of the present disclosure. However, these embodiments are merely for illustrative purposes, and are not intended to limit the scope of the present disclosure. Although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used advantageously in combination. The scope of the present disclosure is defined by the appended claims and their equivalents. Those skilled in the art can make various substitutions and modifications without departing from the scope of the present disclosure, and these substitutions and modifications should all fall within the scope of the present disclosure.

Claims

1. A method for evaluating structural strength of a vertical transfer frame, comprising: determining a stress test area of the vertical transfer frame, and collecting dynamic strain data of the stress test area; calculating a maximum principal strain value and a minimum principal strain value according to the dynamic strain data, respectively; establishing a simulation analysis model of the vertical transfer frame, and applying boundary conditions on the simulation analysis model to simulate a limit working condition according to the maximum principal strain value and the minimum principal strain value, to obtain analysis data; and extracting evaluation parameters of the vertical transfer frame according to the analysis data, and evaluating structural strength of the vertical transfer frame according to the evaluation parameters. The determination of the stress test area of the vertical transfer frame comprises: establishing a finite element test model of the vertical transfer frame; loading a rated load into the finite element test model, and calculating a stress concentration area of the finite element test model; determining the stress test area according to the stress concentration area. The dynamic strain data comprises dynamic strain data in an unloaded working condition and dynamic strain data in a loaded working condition. The collection of the dynamic strain data of the stress test area comprises: arranging strain sensors on an upper surface, a lower surface and a side surface of the stress test area, respectively; determining that the vertical transfer frame is in the unloaded working condition, and collecting the dynamic strain data of the strain sensors in the unloaded working condition, respectively; determining that the vertical transfer frame is in the loaded working condition, and collecting the dynamic strain data of the strain sensors in the loaded working condition, respectively. The strain sensor arranged on the lower surface of the stress test area is a right-angle strain gauge, a 45° direction of the right-angle strain gauge is parallel to a length direction of the stress test area, a 0° direction of the right-angle strain gauge points to an outside of the stress test area, and a 90° direction of the right-angle strain gauge points to an inside of the stress test area.

2. The method of claim 1, wherein, The strain sensor arranged on the upper surface of the stress test area is a uniaxial strain gauge, an axial direction of the uniaxial strain gauge is parallel to the length direction of the stress test area.

3. The method of claim 1, wherein, The calculation of the maximum principal strain value and the minimum principal strain value according to the dynamic strain data comprises:

4. The method of claim 1, wherein, obtaining the dynamic strain data in the unloaded working condition, and calculating an unloaded maximum principal strain value according to the following formula, obtaining the dynamic strain data in the unloaded working condition, and calculating an unloaded minimum principal strain value according to the following formula, obtaining the dynamic strain data in the loaded working condition, and calculating a loaded maximum principal strain value according to the following formula, wherein, represents the unloaded maximum principal strain value, represents the unloaded minimum principal strain value, represents the unloaded tensile stress received by the 0° direction of the strain sensor, represents the unloaded compressive stress received by the 90° direction of the strain sensor, represents the unloaded tensile stress received by the 45° direction of the strain sensor; obtaining the dynamic strain data in the loaded working condition, and calculating a loaded minimum principal strain value according to the following formula, The evaluation parameters comprise a maximum stress, a maximum stress position, a yield strength, a stress distribution trend and a safety factor. wherein, represents the maximum principal strain value of the load, represents the minimum principal strain value of the load, represents the load tensile stress received by the 0° direction of the strain sensor, represents the load compressive stress received by the 90° direction of the strain sensor, represents the load tensile stress received by the 45° direction of the strain sensor.

5. The method of claim 1, wherein, 6.A device for evaluating structural strength of a vertical transfer frame, comprising: a collection module configured to determine a stress test area of the vertical transfer frame, and collect dynamic strain data of the stress test area; a calculation module configured to calculate a maximum principal strain value and a minimum principal strain value according to the dynamic strain data, respectively; a simulation module configured to establish a simulation analysis model of the vertical transfer frame, and apply boundary conditions on the simulation analysis model to simulate a limit working condition according to the maximum principal strain value and the minimum principal strain value, to obtain analysis data. ​ and an evaluation module configured to extract evaluation parameters of the vertical transfer frame according to the analysis data, and evaluate the structural strength of the vertical transfer frame according to the evaluation parameters; wherein the acquisition module comprises a test module configured to establish a finite element test model of the vertical transfer frame, load a rated load into the finite element test model, and determine a stress concentration area of the finite element test model, and determine the stress test area according to the stress concentration area; wherein the dynamic strain data comprises no-load working condition dynamic strain data and load working condition dynamic strain data; the acquisition module further comprises a strain data module configured to arrange strain sensors on upper and lower surfaces and side surfaces of the stress test area, respectively, to determine the no-load working condition of the vertical transfer frame, and to acquire the no-load working condition dynamic strain data of the strain sensors, respectively, to determine the load working condition of the vertical transfer frame, and to acquire the load working condition dynamic strain data of the strain sensors, respectively. 7.An electronic device, comprising: one or more processors; a storage device for storing one or more programs, wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to perform the method according to any one of claims 1-5. 8.A computer-readable storage medium having stored thereon executable instructions that, when executed by a processor, cause the processor to perform the method according to any one of claims 1-5.

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