CN111797548A - Method for detecting strength of inner drum of clothes processing equipment, inner drum and clothes processing equipment - Google Patents
Method for detecting strength of inner drum of clothes processing equipment, inner drum and clothes processing equipment Download PDFInfo
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- CN111797548A CN111797548A CN201910217881.5A CN201910217881A CN111797548A CN 111797548 A CN111797548 A CN 111797548A CN 201910217881 A CN201910217881 A CN 201910217881A CN 111797548 A CN111797548 A CN 111797548A
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Abstract
The method for detecting the strength of the inner cylinder of the clothes processing equipment, wherein the inner cylinder is provided with a strain sensor, comprises the following steps: acquiring a detection value of a strain sensor and generating an actual stress value; performing reverse correction on the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress value; executing corrected finite element analysis until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the actual stress value is greater than or equal to the set contact ratio; and generating an inner cylinder intensity correction model. Also disclosed are an inner cartridge and a laundry treating apparatus. The influence of the dynamic operation strength of the inner cylinder is fully considered, the initial finite element analysis result is reversely corrected based on the actual stress value, the obtained corrected finite element analysis result has high degree of convergence with the real situation, the strength analysis result is more accurate, and an accurate data basis for subsequent production, maintenance and design is provided; the simplification of the inner cylinder structure is not damaged in the whole testing process, and the detection mode is more reasonable and reliable.
Description
Technical Field
The invention belongs to the technical field of electrical equipment, and particularly relates to a method for detecting strength of an inner barrel of clothes treatment equipment, the inner barrel and the clothes treatment equipment.
Background
A laundry treating apparatus, such as a washing machine, a dryer, etc., is provided therein with an inner tub. The inner cylinder is the main working part of the clothes processing equipment, and all working processes of washing, rinsing, dewatering, drying and the like are carried out in the inner cylinder. The structure of the inner drum has a direct relation with the use effect of the clothes treatment equipment. The main structure of the inner cylinder is generally formed by blanking, punching, rolling and welding thin metal plates. Inevitably, the main structure of the inner cylinder is provided with a buckle seam. When the clothes treatment equipment operates, the inner drum rotates under the driving of the motor according to the rotating speed set by a program, particularly the rotating speed is high during dehydration, so that the strength of the fastening seam is required to reach a certain standard, and the use safety of the clothes treatment equipment is ensured.
In the prior art, a finite element analysis method is generally adopted to realize calculation of the seam buckling strength. Finite element analysis, also known as Finite Element Analysis (FEA) or Finite Element Method (FEM), is one method of solving a numerical solution to a field problem. Mathematically, a field problem is described by differential equations or integral expressions, each of which can be used for finite element equations. The existing form of Finite Element (FE) equation is included in the general finite element analysis program. The prior art uses a general finite element analysis program to calculate the stress. In addition to this, the stress can be calculated by cutting a sample sheet of a metal sheet wrapped around the inner cylinder body and performing a drawing test.
Both the two modes have certain defects, the former is a static test process, the influence of the operation condition is not considered, especially the influence of the extreme dehydration condition on the seam buckling strength is not considered, and certain potential safety hazards exist. The latter destroys the simplification verification of the inner cylinder structure, and has limited data accuracy.
Disclosure of Invention
The invention discloses a method for detecting the strength of an inner cylinder of clothes processing equipment, aiming at the problem of inaccurate strength test result of the inner cylinder in the prior art.
A method for detecting the strength of an inner cylinder of clothes processing equipment, wherein a strain sensor is arranged on the inner cylinder, comprises the following steps:
acquiring a detection value of the strain sensor and generating an actual stress value;
performing reverse correction on the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress value;
performing corrected finite element analysis until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the actual stress value is greater than or equal to a set contact ratio;
and generating an inner cylinder intensity correction model.
Further, the step of acquiring the detection value of the strain sensor and generating an actual stress value includes:
and acquiring the detection value of a strain sensor arranged at the buckling seam of the inner cylinder body in a simulation test environment.
A simulation test environment is a uniform load test environment, and constructing the uniform load test environment comprises the following steps:
determining the rated load weight of the inner cylinder according to the capacity of the inner cylinder;
measuring the water content of the rated load at the highest rotating speed, and calculating the water content;
manufacturing a simulation load, wherein the weight of the simulation load is the sum of the weight of a rated load and the water content;
uniformly fixing the simulation load on the inner wall of the inner cylinder body and surrounding the inner wall of the inner cylinder body;
controlling the laundry treating apparatus to operate at a maximum rotation speed.
Another simulation test environment comprises an offset load test environment, and the construction of the offset load test environment comprises the following steps:
measuring the maximum deflection capacity of the inner cylinder;
manufacturing a simulation load, wherein the weight of the simulation load is the maximum deflection amount;
fixing the analog load at the buckling seam of the inner cylinder body;
controlling the clothes device to work at the highest rotating speed.
In order to achieve accurate detection, the step of acquiring the detection value of the strain sensor and generating an actual stress value further comprises:
the strain sensor is arranged by adopting the following method:
screening out nodes with stress concentration distribution from the initial finite element analysis result;
obtaining coordinates of nodes with stress concentration distribution;
and strain sensors are symmetrically arranged at positions corresponding to the stress concentration distribution nodes in the inner cylinder.
Further, the step of acquiring the detection value of the strain sensor and generating the actual stress value further includes:
when a plurality of nodes with stress concentration distribution are screened out from the initial finite element analysis result, a group of strain sensors are symmetrically arranged at the positions corresponding to the nodes with stress concentration distribution in the inner cylinder;
the strain data detector receives the detection value of each strain sensor and transmits the detection value to the upper computer, and the upper computer generates an actual stress value.
As a way of inverse correction, the step of inverse correcting the initial finite element analysis preprocessing parameters of the inner cylinder strength based on the actual stress value comprises:
calculating the difference value between the actual stress value of each stress concentration distribution point and the stress value of the corresponding node in the initial finite element analysis result;
comparing the plurality of difference values with preset difference values respectively;
and when one difference value is larger than a preset value, correcting one or more parameters in the initial finite element analysis preprocessing step.
As another mode of inverse correction, the inverse correction of the initial finite element analysis preprocessing parameter of the inner tube strength based on the actual stress value includes:
inputting the actual stress value of each stress concentration distribution point into a mathematical model of finite element analysis software as a pretreatment parameter;
obtaining a data matrix by finite element analysis software based on a plurality of actual stress values;
calculating the contact ratio of the initial finite element analysis result and the actual stress value;
and adjusting pretreatment parameters in the initial finite element analysis according to the contact ratio.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the method for detecting the strength of the inner barrel of the clothes processing equipment, on one hand, the influence of dynamic operation of the inner barrel on the strength is fully considered, the initial finite element analysis result is reversely corrected based on the actual stress value, the obtained corrected finite element analysis result has high degree of fitting with the real situation, the strength analysis result is more accurate, and an accurate data basis for subsequent production, maintenance and design is provided; on the other hand, the simplification of the inner cylinder structure is not damaged in the whole testing process, and the detection mode is more reasonable and reliable.
Also disclosed is an inner barrel, the inner barrel detecting strength by the following method, comprising:
acquiring a detection value of the strain sensor and generating an actual stress value;
performing reverse correction on the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress value;
performing corrected finite element analysis until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the actual stress value is greater than or equal to a set contact ratio;
and generating an inner cylinder intensity correction model.
The inner cylinder provided by the invention fully considers two conditions of static state and dynamic state during strength detection, and has higher design precision.
The invention further discloses a clothes treatment device, which adopts the following method to detect the strength of the inner cylinder, and the method comprises the following steps:
acquiring a detection value of the strain sensor and generating an actual stress value;
performing reverse correction on the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress value;
performing corrected finite element analysis until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the actual stress value is greater than or equal to a set contact ratio;
and generating an inner cylinder intensity correction model.
The clothes treatment equipment disclosed by the invention has the advantages of safety and reliability.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fabric processing apparatus for detecting strength of an inner drum;
FIG. 2 is a schematic block diagram of signal transmission when detecting the strength of the inner drum in the clothes processing device;
FIG. 3 is a flow chart of a method for detecting the strength of an inner drum of a clothes treating apparatus according to the present invention;
FIG. 4 is a flow chart of constructing a uniform load test environment;
FIG. 5 is a flow chart of constructing an offset load test environment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, is a schematic illustration of a laundry treating apparatus, which in this embodiment is a washing machine. Those skilled in the art will understand without doubt that other home/commercial washing machines, dryers, washer-dryers, and other laundry treatment devices not specifically described, as well as other laundry treatment devices suitable for use with the present invention, are intended to be included within the scope of the present invention.
Washing machines have several basic components: washing part, transmission part, support part, water supply and drainage part and operation control part. Wherein, the washing part mainly comprises an inner cylinder 10, an outer cylinder and other main components. The transmission part comprises a wave wheel 14, a motor, a belt pulley, a belt component and the like, and the supporting part comprises a vibration absorber, an outer box body, a bottom foot and the like. The operation control part comprises a main controller, a water level controller, a temperature controller and the like. Referring to fig. 1, an inner cylinder 10 of a washing component is composed of a plurality of parts such as an inner cylinder body 11, a bottom plate 12 and a balance ring 13, wherein the inner cylinder body 11 is a cylinder formed by blanking, punching and rolling a polished metal sheet, and a buckling seam 15 is formed at the lap joint of the metal sheet. The bottom plate 12 is also formed by blanking and punching a polished metal sheet, and the inner cylinder body 11 and the bottom plate 12 are welded into a whole. When washing, the washing liquid enters the inner cylinder 10 through the holes on the inner cylinder body 11 to soak and wash the clothes; during dewatering, residual liquid on the clothes is thrown out through the small holes.
In this embodiment, the strength of the inner cylinder is tested, which mainly refers to the seam formed when the inner cylinder body is rolled and formed. It will be understood by those skilled in the art that, under certain circumstances, other seams not specifically described that are formed on the inner drum, such as the seam between the inner drum body and the floor, and other similar seams in a laundry treating apparatus, will be within the scope of the present invention.
Referring to fig. 3, in the embodiment, when the strength of the inner cylinder is detected, the finite element analysis result is reversely corrected based on the actual stress value of the stress concentration region under the dynamic operation condition of the inner cylinder, and the corrected finite element analysis result is obtained, so that the corrected finite element analysis result is close to the real stress distribution and is basically equal to the real stress distribution, thereby providing a reliable data base for subsequent design, production and maintenance. Specifically, the method comprises the following steps: and acquiring a detection value of a strain sensor (shown as 20 in fig. 1) arranged on the inner cylinder, and converting the acquired detection value to generate an actual stress value of the inner cylinder at the position where the strain sensor is arranged. And after the actual stress value is obtained, carrying out reverse correction on the initial finite element analysis pretreatment parameters in the static state. And executing correction finite element analysis, and if the contact ratio of the stress value of the node corresponding to the strain sensor in the correction finite element analysis result and the generated actual stress value is greater than or equal to the set contact ratio, generating an inner cylinder strength correction model based on the correction finite element analysis result. And if the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the generated actual stress value is less than the set contact ratio, reversely correcting the initial finite element analysis pretreatment parameters in the static state, executing the corrected finite element analysis, and repeating the steps until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the generated actual stress value is more than or equal to the set contact ratio. The strain sensor 20 is preferably disposed at the pinch seam 15 of the inner barrel body. The set contact ratio can be adjusted according to the precision requirement of actual production.
In order to accurately detect the strength of the inner cylinder, initial finite element analysis of the inner cylinder is firstly carried out. The initial finite element analysis is mainly used for detecting the strength of the inner barrel under a static condition, and comprises two steps of pretreatment and numerical analysis. During preprocessing, data describing the geometry, material properties, loads and boundary conditions of the inner cylinder are input. Secondly, inputting the element type and the element density, and executing automatic division of the finite element mesh by the existing finite element analysis software. In this step, one or more element columns are selected and determined to fit the mathematical model in the finite element analysis software, and the size of the elements in the selected region of the finite element model is determined. And further performing numerical analysis, generating matrixes for describing unit performance by the finite element analysis software according to the pre-processing parameters, combining the matrixes into a large number of matrix equations for representing the finite element structure, and then solving. In the embodiment, the field magnitude value on each node of the inner cylinder, namely the stress value on each node, namely the initial finite element analysis result, is obtained.
In order to provide an accurate data base for reverse correction, the initial finite element analysis result is firstly screened, and the nodes in which the stress is concentrated and distributed are selected. One optional screening method is: and setting a preset stress value. And comparing the stress value of each node in the initial finite element analysis result with a preset stress value. And when the stress value of a certain node is greater than the preset stress value, screening out the corresponding node as a node with stress concentration distribution. The stress concentration distribution node refers to a position where the stress in the inner cylinder is locally increased. At the node of stress concentration distribution, the inner cylinder body is easy to generate fatigue cracks or generate static load fracture.
After the nodes with the stress concentration distribution are selected, the coordinates of the nodes with the stress concentration distribution are obtained. Further, specific positions in the inner cylinder corresponding to the nodes of stress concentration distribution are obtained, and one strain sensor 20 is respectively arranged on two sides of the position of the inner cylinder corresponding to one of the nodes of stress concentration distribution. The strain sensor 20 is a sensor based on measuring the strain generated by a forced deformation of an object. The resistance strain gauge is a sensing element which is most commonly used, and is a sensing element which can convert the change of strain on a mechanical member into the change of resistance, thereby converting the change of stress into an electric signal. The strain sensor 20 may communicate with the upper computer, output a detection signal, and generate an actual stress value by the upper computer. The communication between the strain sensor and the upper computer can be in a wired communication or wireless communication mode, a communication protocol is not further limited, and the strain sensor and the upper computer can be applied to the field of internet of things or can be selected from communication protocols between the strain sensor and data processing equipment in the prior art.
According to the initial finite element analysis result, a plurality of stress concentration distribution nodes can exist in the inner cylinder body, particularly at the buckling seam of the inner cylinder body, and then the coordinates of the stress concentration distribution nodes are obtained. In this case, it is preferable that at least two strain sensors are symmetrically provided around a position in the inner tube corresponding to each stress concentration point. The more strain sensors are arranged, the more detection values are generated, the more the analysis result tends to be in an actual situation, and the higher the reliability is. However, due to the number of interfaces of the test equipment and the data processing capacity, it is generally preferable to select two or four nodes with stress concentration distribution. And two sides of the inner cylinder position of each node corresponding to the stress concentration distribution are respectively provided with a strain sensor. The "both sides" defined herein refer to the left and right sides with the coordinate of the node of the selected stress concentration distribution as a base point and the radial direction of the inner cylinder body as a reference direction. As shown in fig. 1, since a plurality of strain sensors are provided, each strain sensor 20 is connected to a strain data detector 30 provided on the central axis of the inner cylinder bottom plate 12 via a communication cable in order to facilitate data transmission. As shown in fig. 2, the strain data detector 30 is configured to receive a detection value of each strain sensor 20, and transmit the detection value to the upper computer 40 through wired or wireless communication. The strain data detector 30 and the upper computer 40 preferably use USB serial communication or WIFI wireless communication. The upper computer 40 stores a data processing program for converting the detection value into a dynamic detection result, i.e., an actual stress value. The upper computer 40 may be a computer with data processing capability, a mobile terminal represented by a mobile phone or a tablet computer, a server or a remote server, or even a wearable device with data processing capability, and is not further limited herein.
After the strain sensor is completely arranged in the inner cylinder body, the testing environment is further simulated. The test environment is mainly used for simulating various operation states of the washing machine. Especially simulating the running state of the inner cylinder body during high-speed dehydration to test the strength of the inner cylinder body, especially the buckling seam, in the limit state. Preferably, at least two simulated test environments are created. The first is a uniform load test environment. As shown in fig. 4, constructing a uniform load test environment includes the steps of: determining the rated load weight of the inner cylinder according to the capacity of the inner cylinder; measuring the water content of the rated load at the highest rotating speed, and calculating the water content weight; and manufacturing a simulation load, wherein the weight of the simulation load is the sum of the weight of the rated load and the weight of the water, the simulation load is uniformly fixed on the inner wall of the inner barrel body and surrounds the inner wall of the inner barrel body, and the washing machine is controlled to work at the highest rotating speed, if the washing machine works in a dehydration mode and keeps the highest rotating speed, namely the uniform load simulates a test environment. Wherein the water content is the ratio of the water content in the rated load to the total weight. The method for measuring the water content of the rated load at the highest rotating speed is selected from the existing measuring methods in the prior art, and is not limited herein. The dummy load is preferably made of a rubber material. The second is an off-load test environment. As shown in fig. 5, the construction of the unbalanced load test environment includes the following steps: in the dehydration process, the maximum deflection amount of the inner cylinder is measured, and the load weight in the deflection state can be borne. When the maximum deflection amount of the inner cylinder is measured, attention needs to be paid to ensure that the inner cylinder does not collide with the safety suspender. Manufacturing a simulation load, wherein the weight of the simulation load is the maximum deflection amount, and the simulation load is fixed at a buckling seam of the inner cylinder body; the distributed simulation loads are preferably symmetrically distributed along the buckling seams of the inner cylinder body and completely cover the buckling seams. And controlling the washing machine to work at the highest rotating speed, such as controlling the washing machine to work in a dehydration mode and keeping the highest rotating speed, namely an unbalance loading test environment.
The upper computer obtains the detection values of the plurality of strain sensors under each type of simulation test environment, and performs data processing to generate the actual stress values of the points with stress concentration distribution. And (5) performing reverse correction on the initial finite element analysis result by adopting the actual stress value. The inverse correction can also be carried out in two ways, and the first inverse correction comprises the following steps: and calculating the difference value between the actual stress value of each stress concentration distribution point and the stress value of the corresponding node in the corresponding initial finite element analysis result, and comparing the plurality of difference values with preset difference values. And when one difference is larger than the preset difference, the contact ratio of the two is considered to be smaller than the set contact ratio. One or more parameters of the preliminary finite element analysis processing step are modified. The parameters include, but are not limited to, inner cylinder geometry, load and boundary condition data, and element density, and a corrected finite element analysis is performed, the difference between the actual stress value of each stress concentration distribution point and the stress value of the corresponding node in the corresponding corrected finite element analysis result is calculated, and the plurality of differences are compared with a preset difference. If the difference values are smaller than or equal to the preset difference value, namely the contact ratio between the difference values and the preset contact ratio is larger than or equal to the set contact ratio, and the expected requirement is met, the corrected finite element analysis result is stored, and is used as the analysis result of the strength of the inner barrel of the washing machine, and further used as a data base for subsequent maintenance, production and design. If all the strain sensors are arranged at the buckling seams, the result is the analysis result of the buckling seam strength of the inner drum of the washing machine. And if at least one difference value in the plurality of difference values is larger than the preset difference value, considering that the contact ratio between the plurality of difference values and the preset difference value is still smaller than the set contact ratio, correcting one or more parameters in the initial finite element analysis pretreatment step again, and executing the corrected finite element analysis again until all the difference values are smaller than or equal to the preset difference value. The second inverse correction comprises the following steps: inputting the actual stress values of the points with concentrated stress distribution into a mathematical model of finite element analysis software as preprocessing parameters, automatically obtaining a simple data matrix by the finite element analysis software based on a plurality of actual stress values, further calculating the contact ratio of the initial finite element analysis result and the actual stress values through approximation and fitting, automatically adjusting the preprocessing parameters in the initial finite element analysis according to the contact ratio and executing corrected finite element analysis until the contact ratio between the corrected finite element analysis result and the actual stress values reaches a set contact ratio, namely is more than or equal to the set contact ratio and approaches infinitely, storing the corrected finite element analysis result, and taking the corrected finite element analysis result as the analysis result of the strength of the inner barrel of the washing machine, namely generating an inner barrel strength correction model as a data basis for subsequent maintenance, production and design. The inner cylinder intensity correction model can be a cloud picture, a data table or a database.
In the above embodiment, the set position of the strain sensor is based on the initial finite element analysis result. In fact, localized stress risers are typically found where the shape of the inner barrel changes dramatically, such as notches, holes, grooves, and rigid constraints. Therefore, the strain sensors can also be directly arranged at the buckling seams of the inner cylinder body, four lines are sequentially and uniformly distributed along the axial direction from the front end plate to the bottom plate, each line comprises two strain sensors which are symmetrically arranged at two sides of the buckling seams by taking the buckling seams as central lines, the average value of the detected stress values of each line of the strain sensors is calculated, and the average value is used as the actual stress value. This approach is a simplified approach.
According to the method for detecting the strength of the inner barrel of the clothes processing equipment, on one hand, the influence of dynamic operation of the inner barrel on the buckling seam strength is fully considered, the reverse correction is carried out on the initial finite element analysis result based on the actual stress value, the obtained corrected finite element analysis result has high degree of fitting with the real situation, the strength analysis result is more accurate, and an accurate data base for subsequent production, maintenance and design is generated; on the other hand, the simplification of the inner cylinder structure is not damaged in the whole testing process, and the detection mode is more reasonable and reliable.
The invention also discloses an inner cylinder for the clothes processing equipment, wherein the strength of the inner cylinder is detected by the inner cylinder strength detection method described in detail in the embodiment. The detailed steps of the inner cylinder strength detection method refer to the detailed description and the description of the above embodiments and the drawings in the specification, and are not repeated herein. The inner cylinder detected by the intensity detection method can achieve the same technical effect.
The invention also discloses a clothes processing device, wherein the strength of the inner cylinder in the clothes processing device is detected by the inner cylinder strength detection method described in detail in the embodiment. The detailed steps of the inner cylinder strength detection method refer to the detailed description and the description of the above embodiments and the drawings in the specification, and are not repeated herein. The clothes processing equipment adopting the strength detection method can achieve the same technical effect.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. The method for detecting the strength of the inner cylinder of the clothes processing equipment is characterized in that a strain sensor is arranged on the inner cylinder, and comprises the following steps:
acquiring a detection value of the strain sensor and generating an actual stress value;
performing reverse correction on the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress value;
performing corrected finite element analysis until the contact ratio of the stress value of the node corresponding to the strain sensor in the corrected finite element analysis result and the actual stress value is greater than or equal to a set contact ratio;
and generating an inner cylinder intensity correction model.
2. The method of claim 1, wherein the step of obtaining the detection value of the strain sensor and generating the actual stress value comprises:
and acquiring the detection value of a strain sensor arranged at the buckling seam of the inner cylinder body in a simulation test environment.
3. The method of claim 2, wherein the simulated test environment comprises a uniform load test environment, and wherein constructing the uniform load test environment comprises:
determining the rated load weight of the inner cylinder according to the capacity of the inner cylinder;
measuring the water content of the rated load at the highest rotating speed, and calculating the water content;
manufacturing a simulation load, wherein the weight of the simulation load is the sum of the weight of a rated load and the water content;
uniformly fixing the simulation load on the inner wall of the inner cylinder body and surrounding the inner wall of the inner cylinder body;
controlling the laundry treating apparatus to operate at a maximum rotation speed.
4. The method of claim 2, wherein the simulated test environment comprises an offset load test environment, and wherein constructing the offset load test environment comprises:
measuring the maximum deflection capacity of the inner cylinder;
manufacturing a simulation load, wherein the weight of the simulation load is the maximum deflection amount;
fixing the analog load at the buckling seam of the inner cylinder body;
controlling the clothes device to work at the highest rotating speed.
5. The method for detecting the strength of the inner drum of the clothing processing apparatus according to any one of claims 3 or 4, wherein:
the step of acquiring the detection value of the strain sensor and generating the actual stress value further includes:
the strain sensor is arranged by adopting the following method:
screening out nodes with stress concentration distribution from the initial finite element analysis result;
obtaining coordinates of nodes with stress concentration distribution;
and strain sensors are symmetrically arranged at positions corresponding to the stress concentration distribution nodes in the inner cylinder.
6. The method of claim 5, wherein the method further comprises: the step of obtaining a detection value of the strain sensor and generating an actual stress value further comprises:
when a plurality of nodes with stress concentration distribution are screened out from the initial finite element analysis result, a group of strain sensors are symmetrically arranged at the positions corresponding to the nodes with stress concentration distribution in the inner cylinder;
the strain data detector receives the detection value of each strain sensor and transmits the detection value to the upper computer, and the upper computer generates an actual stress value.
7. The method of claim 6, wherein the method further comprises:
the step of reversely correcting the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress values comprises the following steps:
calculating the difference value between the actual stress value of each stress concentration distribution point and the stress value of the corresponding node in the initial finite element analysis result;
comparing the plurality of difference values with preset difference values respectively;
and when one difference value is larger than a preset value, correcting one or more parameters in the initial finite element analysis preprocessing step.
8. The method of claim 6, wherein the method further comprises:
the reverse correction of the initial finite element analysis pretreatment parameters of the inner cylinder strength based on the actual stress values comprises the following steps:
inputting the actual stress value of each stress concentration distribution point into a mathematical model of finite element analysis software as a pretreatment parameter;
obtaining a data matrix by finite element analysis software based on a plurality of actual stress values;
calculating the contact ratio of the initial finite element analysis result and the actual stress value;
and adjusting pretreatment parameters in the initial finite element analysis according to the contact ratio.
9. An inner drum for a laundry treatment apparatus, characterized in that a method for detecting strength of an inner drum for a laundry treatment apparatus according to any one of claims 1 to 8 is used.
10. A laundry treating apparatus, characterized in that the laundry treating apparatus drum strength detecting method according to any one of claims 1 to 8 is adopted.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910217881.5A CN111797548B (en) | 2019-03-21 | 2019-03-21 | Method for detecting strength of inner drum of clothes processing equipment, inner drum and clothes processing equipment |
| JP2021551872A JP7094458B2 (en) | 2019-03-21 | 2020-03-04 | Inner tank strength detection method in clothing processing equipment, inner tank and clothing processing equipment |
| PCT/CN2020/077709 WO2020187022A1 (en) | 2019-03-21 | 2020-03-04 | Strength detection method for inner tub of laundry treating device, and inner tub and laundry treating device |
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| CN201910217881.5A CN111797548B (en) | 2019-03-21 | 2019-03-21 | Method for detecting strength of inner drum of clothes processing equipment, inner drum and clothes processing equipment |
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| CN111797548A true CN111797548A (en) | 2020-10-20 |
| CN111797548B CN111797548B (en) | 2022-09-16 |
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| CN106525597B (en) * | 2016-11-10 | 2018-12-18 | 浙江广川工程咨询有限公司 | A kind of U-shaped thin-shell aqueduct body safety detection and evaluation method |
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| CN103983386A (en) * | 2014-05-19 | 2014-08-13 | 盐城工学院 | Cylindrical part surface machining stress measuring method based on finite element compensation coefficient |
| US20170318360A1 (en) * | 2016-05-02 | 2017-11-02 | Bao Tran | Smart device |
| CN109299542A (en) * | 2018-09-25 | 2019-02-01 | 中国水利水电科学研究院 | Detection method based on the PCCP pipeline fracture of wire that on-site test is combined with numerical simulation |
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