A tobacco mass flow belt scale calibration apparatus and method

Abstract

The application discloses a kind of tobacco mass flow belt scale calibration device and calibration method, the tobacco mass flow belt scale calibration device includes pipeline fastening ring, flow balance valve, whole machine support, soft connection pipe, fixed hinge, gradually expanding cavity, horizontal air distribution plate, free-flowing cavity, Laval nozzle, display control screen, connecting line, action ware, lifting adjustment structure, pneumatic execution structure, injection component support rod, lifting platform, compressed air inlet connection end.Through the tobacco mass flow belt scale calibration device can realize to cigarette enterprise silk workshop tobacco mass flow belt scale and carry out regularity checking work.The tobacco mass flow belt scale calibration method of the application fills the blank of numerical method simulation tobacco flow belt scale calibration method, and has the advantages that additional standard weight or material physical object is not needed, tobacco flow belt scale calibration is good in convenience, calibration time is short, manpower consumption is small, result is reliable, and operator human factor interference is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tobacco process detection, in particular to a cut tobacco mass flow belt scale calibration device and calibration method. BACKGROUND

[0002] During the operation of the belt scale, the zero point and the range of the belt scale will drift to different degrees due to various factors. For example, the belt scale will be affected by the adhesion of the material, the change of the belt tension or the deviation of the belt, and the shortening or elongation of the belt caused by the change of the temperature. In order to ensure the accuracy of the belt scale, the belt scale needs to be calibrated regularly.

[0003] For cut tobacco, according to the requirements of the State Tobacco Monopoly Bureau for the cigarette process specification, the calibration method of the electronic belt scale is divided into two types: one is the simulation load method, and the other is the real material passing method. The simulation load method is to place the standard weights with known weights uniformly on the weighing section of the electronic belt scale, and record the cumulative display value of the electronic belt scale after the weights flow uniformly through the electronic belt scale. The average value is calculated by repeating the measurement. The test requires P s ≥ 50 kg. The calculation formula is: In the formula, δ ds is the measurement accuracy of the electronic belt scale (%), P s is the cumulative weight of the placed weights (kg), and C s is the cumulative weight displayed by the electronic belt scale (kg). The real material passing method is to use a certain weight of tobacco material (more than 50 kg) to pass through the electronic belt scale or collect all the material at the outlet after weighing, and compare the cumulative value of the electronic belt scale. The average value is calculated by repeating the measurement. In theory, the above two calibration methods both use the principle of incremental superposition, but the properties of the superimposed materials are different.

[0004] For the simulation load method, a series of operations need to be performed by the on-site operator, such as placing the standard weights, recovering the standard weights, and calculating the average value. At the same time, the placement process inevitably introduces errors caused by human factors. For example, the lifting action of the standard weights will affect the scale frame of the auxiliary belt scale and cause errors. Therefore, the simulation load method requires a certain amount of manpower, and the on-site operator may also introduce certain errors during the operation. The real material passing method is more complicated to operate, and it is necessary to first weigh the tobacco material involved in the calibration, which is very laborious to move and weigh. In addition, the properties of the cut tobacco material (cut tobacco structure, moisture content) will change during the passing process, which is not conducive to the repeated use of the cut tobacco material. In addition, the introduction of the static hopper scale measurement error of the weighing hopper also increases the calibration error of the real material passing method.

[0005] In view of this, it is necessary to develop a kind of additional standard weight or material physical object, can improve the tobacco flow belt scale calibration convenience, calibration time is short, the human consumption is small, the result is reliable and the operator human factor interference is small tobacco mass flow belt scale calibration device and calibration method. SUMMARY

[0006] In order to solve the problems existing in the prior art method, improve the intelligent level of tobacco flow calibration, improve the convenience of belt scale calibration, reduce the consumption of human resources, and reduce the interference of human factors of the operator, the purpose of the present application is realized by the following technical solutions:

[0007] The first purpose of the present application is to provide a tobacco mass flow belt scale calibration device, which comprises a pipeline fastening ring, a flow balance valve, a whole machine support, a flexible connection pipe, a fixed hinge, a gradually expanding cavity, a horizontal air distribution plate, a free flow cavity, a Laval nozzle, a display control screen, a connecting line, an actuator, a lifting adjustment structure, a pneumatic execution structure, a jet component support rod, a lifting platform and a compressed air inlet connection end. The whole machine support is fixed above the transmission belt, the pipeline fastening ring is wrapped around the compressed air inlet connection end on the inside, and the outside is connected with the whole machine support. One end of the compressed air inlet connection end is connected with compressed air, and the other end is connected with the flow balance valve. The flow balance valve is connected with the flexible connection pipe. The lower side of the flexible connection pipe is connected with the gradually expanding cavity through a circular pipe. The horizontal air distribution plate is arranged at the tail end of the gradually expanding cavity. The lower end of the horizontal air distribution plate is connected with the free flow cavity, and the free flow cavity is connected with the Laval nozzle. The lifting platform is installed on one side of the whole machine support, and the horizontal height of the lifting platform is adjusted through the lifting adjustment structure on the lifting platform. The display control screen is connected with the actuator through the connecting line, and the pneumatic execution structure is controlled through the actuator, so that the cylinder of the pneumatic execution structure is contracted or expanded. The airflow jet component and the lifting platform are connected with the pneumatic execution structure through the fixed hinge respectively. The jet component support rod and the airflow jet component are connected through the fixed hinge.

[0008] The device structure, installation method, working principle and working process of the present application are further described as follows:

[0009] The whole machine support is fixed above the conveying belt. The compressed air flows along its direction, and will pass through the compressed air inlet connecting end, the flow balance valve, the soft connecting pipe, the gradually expanding cavity, the air distribution plate, the free flow cavity and the Laval nozzle, and finally is sprayed on the conveying belt. The inner side of the pipe fastening ring is wrapped with the compressed air inlet connecting end, and the outer side is connected with the whole machine support, which is used to fix the compressed air inlet connecting end. One end of the compressed air inlet connecting end is connected with the compressed air, and the other end is connected with the flow balance valve. The flow balance valve at the lower side of the compressed air inlet connecting end is used to adjust the flow of the compressed air. The flow balance valve is connected with the soft connecting pipe, which provides displacement compensation for the free folding and unfolding of the air flow spraying part (including the fixed hinge, the gradually expanding cavity, the air distribution plate, the free flow cavity and the Laval nozzle), and reduces and absorbs the vibration and noise of the pipe system, to a certain extent, to protect the normal work of the system. A round pipe is connected below the soft connecting pipe, which has the same diameter as the compressed air inlet section. After the air flow passes through the flow balance valve, the soft connecting pipe and the round pipe, it enters the gradually expanding cavity. A horizontal air distribution plate is arranged at the tail end of the gradually expanding cavity, which is used to adjust the flow of the air flow again and improve the uniformity of the flow, and to reduce the flow boundary layer effect. Then, the air flow enters the free flow cavity. Finally, the air flow enters the Laval nozzle and is sprayed on the conveying belt.

[0010] The lifting platform is installed on one side of the whole machine support, and is used to connect and support the pneumatic execution structure, the actuator and the spraying part support rod. The horizontal height of the lifting platform is adjusted through the lifting adjustment structure. The display control screen is connected with the actuator through the connecting line, and controls the pneumatic execution structure through the actuator, so that the cylinder of the pneumatic execution structure contracts or expands, to realize the arrangement and folding of the air flow spraying part (including the fixed hinge, the gradually expanding cavity, the air distribution plate, the free flow cavity and the Laval nozzle). The air flow spraying part and the lifting platform are connected with the pneumatic execution structure through the fixed hinge. The spraying part support rod and the air flow spraying part are connected through the fixed hinge.

[0011] Preferably, a soft pad ring is arranged between the inner side of the pipe fastening ring and the compressed air inlet connecting end pipe, to reduce the influence of the vibration caused by the action of the pneumatic execution structure on the pipe. The inner diameter size of the pipe fastening ring can be adjusted through the bolt fastener, to adapt to the compressed air inlet connecting end with different outer diameters.

[0012] Preferably, the flow balance valve adopts a pneumatic regulating valve, to ensure the food safety requirement of the tobacco as the food. The flow accuracy of the flow balance valve is within 5%.

[0013] Preferably, the gradually expanding cavity is a regular quadrangular prism (trapezoidal table) structure. The upper and lower bottom surfaces are squares, and the side length of the upper bottom surface is greater than the outer diameter of the connecting round pipe; the side length of the lower bottom surface is greater than 1.5 times of the side length of the upper bottom surface, to realize the gradual widening process of the air flow. The height of the regular quadrangular prism is not less than the side length of the upper bottom surface, to reduce the air flow pulsation and ensure the full development of the flow.

[0014] Preferably, the horizontal air distribution plate is a geometry with uniform circular holes on the horizontal plate. The air distribution plate has a ventilation degree ≥ 50% to ensure that the throttle loss of the air distribution plate is within a reasonable range. The radius of the circular holes is ≤ 8 mm, and the number of holes is determined according to the ventilation degree.

[0015] Preferably, the free flow cavity is a cavity cuboid structure with a height not less than the height of the gradually expanding cavity to ensure the full development of the compressed air flow.

[0016] Preferably, the front half of the Laval nozzle is contracted to a narrow throat from large to small, and then expanded outward from small to large to the bottom of the pipe. The gas in the pipe body flows into the front half of the nozzle under high pressure, and then escapes from the rear half after passing through the narrow throat. The gas flow undergoes an isentropic expansion process in the Laval nozzle. The number of Laval nozzles is ≥ 4 (and is an even number), and is axisymmetric and center symmetric with respect to the main flow direction axis in the circular pipe.

[0017] Preferably, the geometric structure of the Laval nozzle is designed to ensure that the isentropic flow velocity in the convergent pipe of the front half can and can only continuously change to Ma (Mach number) = 1, so that the gas flow in the Laval nozzle changes from subsonic to sonic.

[0018] Preferably, the display control screen is used to: (1) control the lifting adjustment structure to set the horizontal height of the lifting platform; (2) connected to the actuator through the connecting line and control the pneumatic execution structure through the actuator to realize the deployment and stowage of the air flow injection component; (3) display the real-time pressure of compressed air at the entrance of the display device; (4) display the transmission speed of the transmission belt; (5) display the tobacco material flow calibration simulation value. During the actual calibration process on site, the display control screen can be operated with one key, which brings great convenience to the operator.

[0019] Preferably, the stroke of the cylinder piston of the pneumatic execution structure enables the air flow injection component to realize a rotation of not less than 60°.

[0020] Preferably, an emergency stop switch is provided on the actuator, which can realize the stowage of the air flow injection component and the cut-off of compressed air at any time, realize the flexible control of various risks caused by unknown factors in production, and ensure the safety of production.

[0021] Preferably, the lifting platform is installed on one side of the whole machine support through the lifting adjustment structure, and the adjustment range of the lifting adjustment structure is greater than 10 cm.

[0022] The second object of the present application is to provide a method for calibrating a tobacco mass flow belt scale, which fills the gap of the numerical method simulation method for calibrating a tobacco mass flow belt scale, and has the advantages of not needing additional standard weights or materials, good calibration convenience of the tobacco mass flow belt scale, short calibration time, small labor consumption, reliable results, and small interference of human factors of the operator.

[0023] To achieve this object, the present application adopts the following technical solutions:

[0024] The present application provides a method for calibrating a tobacco mass flow belt scale, comprising the following steps:

[0025] Step 1. Collection and analysis of data: Collect various basic data, including but not limited to tobacco mass flow belt scale design drawings, tobacco mass flow belt scale operation data, and historical calibration data of the traditional simulation load method; when using the data, carefully analyze and check the data, carefully investigate the problems, and eliminate possible errors and omissions.

[0026] Step 2. Preliminary determination of airflow field structure: According to the required air flow and flow rate experience value sprayed on the belt scale, combined with the airflow flow characteristics, and considering the flow loss along the way and the throttling loss, the airflow field structure is preliminarily determined. The preliminary flow field structure corresponds to the basic data of the tobacco measuring belt scale.

[0027] Step 3. Model establishment and simulation method determination: Establish a three-dimensional physical model of the airflow in the internal and external regions of the spray component; according to the simulation efficiency and the accuracy of the tobacco flow calibration, select appropriate control equation discretization methods (finite difference method, finite element method, finite volume method), turbulence mathematical model and flow field solving algorithm, and establish the CFD simulation software accordingly.

[0028] Step 4. Simulation solution: boundary constraint condition determination and calculation region discretization; iterative solution and grid independence verification; simulation result storage, analysis and flow field structure optimization reconstruction.

[0029] Step 5. Auxiliary structure design: based on the simulation results of the airflow field, design the corresponding auxiliary equipment structure, including but not limited to the whole machine support, lifting platform, lifting adjustment structure, pneumatic execution structure, actuator, spray component support rod, fixed hinge, pipe fastening ring, selection of appropriate flow balance valve, soft connection pipe and display control screen.

[0030] Step 6. Modification implementation and application. The tobacco mass flow belt scale of the production line is modified, and finally applied to the actual production process.

[0031] As a preferred embodiment of the present application, Step Step2 specifically comprises the following steps:

[0032] Step Step201. Presetting the pressure of the jet gas flow acting on the belt scale. According to the flow rate of the cut tobacco material in the actual production process, the time-averaged pressure of the local area of the belt scale is determined, and the preset pressure of the jet gas flow acting on the belt scale is determined accordingly.

[0033] Step Step202. Determining the empirical value of the gas velocity at the outlet of the Laval nozzle. Assuming that there is no reverse velocity (horizontal tangential flow) after the jet gas flow acts on the belt, the empirical value of the gas velocity at the outlet of the Laval nozzle is determined according to the law of conservation of momentum and in combination with the preset pressure acting on the belt scale.

[0034] Step Step203. Preliminarily determining the gas flow field structure according to the empirical value of the gas velocity at the outlet of the Laval nozzle, in combination with the flow characteristics of the gas flow, and taking into comprehensive consideration various flow losses (friction loss coefficient, throttling loss coefficient), including but not limited to the resistance coefficient of the flow balance valve, the ventilation degree of the air distribution plate, the number of Laval nozzles, the throat area of the Laval nozzle, and other cross-sectional areas of each section along the way. The initially determined flow field structure corresponds to the basic data of the cut tobacco measuring belt scale.

[0035] As a preferred embodiment of the present application, Step Step4 specifically comprises the following steps:

[0036] Step Step401. Boundary constraint condition establishment and calculation region discretization. According to the actual boundary and the spatial influence area of the geometric body, the boundary constraint condition of the jet gas flow is determined. According to the region discretization method, the grid of each three-dimensional model section is divided by region. The calculation region includes but is not limited to the circular pipe section, the gradually expanding cavity, the air distribution plate, the free-flowing cavity, the Laval nozzle, and the transmission belt end. The size of the CFD calculation grid of the gas flow field needs to be determined by comprehensively considering the accuracy of the gas phase field, the smoothness of the time and space variation, and the consumption of the calculation. The grid density of the key regions where the flow field changes sharply (near the horizontal air distribution plate, inside the Laval nozzle) is increased to improve the numerical simulation accuracy.

[0037] Step Step402. Iterative solution and grid independence verification: numerical iterative solution and grid sensitivity analysis are performed to determine the optimal CFD grid size of the gas phase field, and the grid independence verification is realized. If the requirement is met, the next step is entered; otherwise, the calculation grid needs to be modified, and the process jumps to Step Step401.

[0038] Step 403. Simulation result storage, analysis and flow field structure optimization reconstruction: store and analyze the simulation results, determine the relationship between the device inlet pressure and the pressure value of the airflow injection on the belt scale, and finally convert it into the relationship between the device inlet pressure and the simulated value of the tobacco flow, and optimize the reconstruction of the structure of each component accordingly. If the design requirements are met, proceed to the next step; otherwise, modify the structure size of each component and jump to step Step 201.

[0039] The detection device is suitable for accurate calibration of the tobacco quality flow belt scale in the tobacco making workshop of each cigarette factory. The device can be permanently installed on the tobacco measuring belt scale and can meet the requirements of frequent calibration of the tobacco quality flow belt scale.

[0040] The beneficial effects of the present application are:

[0041] Compared with the prior art, the present application has the following significant progress:

[0042] The present application provides a tobacco quality flow belt scale calibration device. Compared with traditional calibration devices, the present application does not require standard weights or physical materials, reduces labor consumption, improves the convenience of calibration, and improves the intelligent level of tobacco flow calibration. The required calibration time is shorter. In the traditional analog load method, the placement of the weight on the belt scale, the horizontal movement of the belt scale driven by the weight, and the weight recovery process are performed in sections and intervals for the overall calibration process. However, using the device of the present application, the calibration process is continuous, and the required time is shorter. In the traditional physical material passing method, the static measurement of the material occupies a large amount of time, while the present application can immediately carry out calibration work by simply placing the airflow injection component and connecting the gas source. Therefore, the calibration device of the present application is also shorter in time than the physical material passing method. The influence of human factors in the traditional calibration method is effectively overcome, and the results are more reliable.

[0043] The application also provides a method for calibrating a tobacco mass flow belt scale, which fills the blank of the numerical method simulation method for calibrating the tobacco mass flow belt scale. The method has low cost and short cycle. In the structural design stage, compared with the test method, the method does not need to build a verification test bench, does not need to purchase related experimental materials, and does not need to maintain the site, consumables and equipment. The human and material consumptions of the application are far less than those of the test method. The method only needs a few days from three-dimensional modeling to calculation result output, which is far shorter than the test method. The structural optimization process of the tobacco mass flow belt scale calibration method of the application is convenient. By using the method, the modification and optimization of the structure are very convenient. Only the corresponding parameters need to be modified, and the numerical calculation software can re-divide the grid and iteratively calculate. During this period, there is almost no additional human and material consumption. If the test method is used, the workload, cost and cycle will be greatly increased. The tobacco mass flow belt scale calibration method can obtain all parameters in the whole domain. Some process parameters are difficult to measure by the test method and have no interference on the test process (such as local airflow velocity). By using the tobacco mass flow belt scale calibration method, all parameters in the whole domain can be obtained, which provides a basis for structural optimization and makes the structural optimization process more scientific. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0045] Figure 1 The structural schematic diagram of the tobacco mass flow belt scale calibration device provided in the embodiments of the present application;

[0046] Figure 2 The airflow injection component retracted state schematic diagram of the tobacco mass flow belt scale calibration device provided in the embodiments of the present application;

[0047] Figure 3 The three-dimensional numerical simulation flow schematic diagram of the tobacco mass flow belt scale calibration method provided in the embodiments of the present application;

[0048] Figure 4 The calculation grid division schematic diagram of the tobacco mass flow belt scale calibration method provided in the embodiments of the present application;

[0049] Figure 5 The calculation result velocity field profile schematic diagram of the tobacco mass flow belt scale calibration method provided in the embodiments of the present application.

[0050] Reference signs:

[0051] 1, pipe fastening ring; 2, flow balance valve; 3, whole machine support; 4, flexible connecting pipe; 5, fixed hinge; 6, diverging cavity; 7, air distribution plate; 8, free flow cavity; 9, Laval nozzle; 10, transmission belt; 11, display control screen; 12, connecting wire; 13, actuator; 14, lifting adjustment structure; 15, pneumatic execution structure; 16, injection component support rod; 17, lifting platform; 18, compressed air inlet connecting end. DETAILED DESCRIPTION

[0052] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0053] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0055] In the description of the present embodiment, the terms "up", "down", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0056] As Figure 1As shown, the embodiment provides a tobacco mass flow belt scale calibration device, mainly comprising a pipeline fastening ring 1, a flow balance valve 2, a whole machine support 3, a soft connection pipe 4, a fixed hinge 5, a gradually expanding cavity 6, a horizontal air distribution plate 7, a free flow cavity 8, a Laval nozzle 9, a display control screen 11, a connecting line 12, an actuator 13, a lifting adjustment structure 14, a pneumatic execution structure 15, a jet component support rod 16, a lifting platform 17 and a compressed air inlet connection end 18. The whole machine support 3 is fixed above the transmission belt 10. The pipeline fastening ring 1 is wrapped with the compressed air inlet connection end 18 on the inside, and connected with the whole machine support 3 on the outside. One end of the compressed air inlet connection end 18 is connected with compressed air, and the other end is connected with the flow balance valve 2. The flow balance valve 2 is connected with the soft connection pipe 4. The lower side of the soft connection pipe 4 is connected with the gradually expanding cavity 6 through a round pipe. The horizontal air distribution plate 7 is arranged at the tail end of the gradually expanding cavity 6. The lower end of the horizontal air distribution plate 7 is connected with the free flow cavity 8, and the free flow cavity 8 is connected with the Laval nozzle 9. The lifting platform 17 is installed on one side of the whole machine support 3, and the horizontal height of the lifting platform 17 is adjusted through the lifting adjustment structure 14 on the lifting platform 17. The display control screen 11 is connected with the actuator 13 through the connecting line 12, and controls the pneumatic execution structure 15 to make the air cylinder of the pneumatic execution structure 15 contract or expand through the actuator 13. The airflow jet component and the lifting platform 17 are respectively connected with the pneumatic execution structure 15 through the fixed hinge 5. The jet component support rod 16 and the airflow jet component are connected through the fixed hinge 5.

[0057] The structure, installation mode, working principle and working process of the tobacco mass flow belt scale calibration device of the present application are further described as follows:

[0058] As Figures 1-2As shown, in this embodiment, the whole machine support 3 is fixed above the conveying belt 10. The compressed air will flow through the compressed air inlet connecting end 18, the flow balance valve 2, the flexible connecting pipe 4, the gradual expansion cavity 6, the horizontal air distribution plate 7, the free flow cavity 8 and the Laval nozzle 9 in sequence, and finally be sprayed on the conveying belt 10. The inside of the pipe fastening ring 1 is wrapped with the compressed air inlet connecting end 18, and the outside is connected with the whole machine support 3, which is used to fix the compressed air inlet connecting end 18. One end of the compressed air inlet connecting end 18 is connected with the compressed air, and the other end is connected with the flow balance valve 2. The flow balance valve 2 at the lower side of the compressed air inlet connecting end 18 is used for adjusting the flow of the compressed air. The flow balance valve 2 is connected with the flexible connecting pipe 4, which provides displacement compensation for the free extension and retraction of the air flow spraying components (including the fixed hinge 5, the gradual expansion cavity 6, the horizontal air distribution plate 7, the free flow cavity 8 and the Laval nozzle 9), reduces and absorbs the vibration and noise of the pipe system, and to some extent protects the normal operation of the system. A circular pipe with the same diameter as the compressed air inlet end 18 is connected at the lower side of the flexible connecting pipe 4. After the air flow passes through the flow balance valve 2, the flexible connecting pipe 4 and the circular pipe, it enters the gradual expansion cavity 6. The horizontal air distribution plate 7 is arranged at the tail end of the gradual expansion cavity 6, which is used to adjust the flow of the air flow again and improve the uniformity of the flow, and to weaken the flow boundary layer effect. Then, the air flow enters the free flow cavity 8. Finally, the air flow enters the Laval nozzle 9 and is sprayed on the conveying belt 10.

[0059] Further, the lifting platform 17 is installed on one side of the whole machine support 3, which is used to connect and support the pneumatic execution structure 15, the actuator 13 and the spraying component support rod 16. The horizontal height of the lifting platform 17 is adjusted through the lifting adjustment structure 14. The display control screen 11 is connected with the actuator 13 through the connecting line 12, and controls the pneumatic execution structure 15 through the actuator 13, so that the air cylinder of the pneumatic execution structure 15 contracts or expands, and the arrangement and folding of the air flow spraying components (including the fixed hinge 5, the gradual expansion cavity 6, the air distribution plate, the free flow cavity 8 and the Laval nozzle 9) are realized. The air flow spraying components and the lifting platform 17 are connected with the pneumatic execution structure 15 through the fixed hinge 5 respectively. The spraying component support rod 16 and the air flow spraying components are connected through the fixed hinge 5.

[0060] As an alternative technical solution, as shown in FIG. 2, the compressed air inlet connecting end 18 is connected with the flow balance valve 2 through the flexible connecting pipe 4, and the flexible connecting pipe 4 is connected with the gradual expansion cavity 6 through the fixed hinge 5. The gradual expansion cavity 6 is connected with the horizontal air distribution plate 7 through the free flow cavity 8, and the horizontal air distribution plate 7 is connected with the Laval nozzle 9 through the fixed hinge 5. The Laval nozzle 9 is connected with the conveying belt 10 through the spraying component support rod 16. Figures 1-2 As an alternative technical solution, as shown in FIG. 2, the compressed air inlet connecting end 18 is connected with the flow balance valve 2 through the flexible connecting pipe 4, and the flexible connecting pipe 4 is connected with the gradual expansion cavity 6 through the fixed hinge 5. The gradual expansion cavity 6 is connected with the horizontal air distribution plate 7 through the free flow cavity 8, and the horizontal air distribution plate 7 is connected with the Laval nozzle 9 through the fixed hinge 5. The Laval nozzle 9 is connected with the conveying belt 10 through the spraying component support rod 16.

[0061] Figures 1-2 ​As shown, in this embodiment, the flow balancing valve 2 is a pneumatic regulating valve to ensure the food safety requirements of the tobacco used as a smoking food. The flow accuracy of the flow balancing valve 2 is within 5%.

[0062] As an optional technical solution, such as Figures 1-2 As shown, in this embodiment, the expanding cavity 6 is a regular square truncated pyramid (trapezoidal truncated pyramid) structure. The upper and lower bases are squares, with the side length of the upper base greater than the outer diameter of the connecting circular tube; the side length of the lower base is 1.5 times greater than the side length of the upper base, to achieve a gradual widening of the airflow. The height of the square truncated pyramid is not less than the side length of the upper base, to reduce airflow pulsation and ensure sufficient flow development.

[0063] As an optional technical solution, such as Figures 1-2 As shown, in this embodiment, the horizontal air distribution plate 7 is a geometric structure with uniformly spaced circular holes on a horizontal plate. The ventilation rate of the horizontal air distribution plate 7 is not less than 50% to ensure that the throttling loss of the air distribution plate is within a reasonable range. The radius of the circular holes is not greater than 8mm, and the number of holes is set according to the ventilation rate.

[0064] As an optional technical solution, such as Figures 1-2 As shown, in this embodiment, the free-flow cavity 8 is a hollow cuboid structure, and its height is not less than the height of the gradually expanding cavity 6 to ensure the full development of compressed air flow.

[0065] As an optional technical solution, such as Figures 1-2 As shown, in this embodiment, the front half of the Laval nozzle 9 narrows towards the center, forming a narrow throat, and then expands outwards towards the bottom of the nozzle. Gas in the pipe flows into the front half of the nozzle under high pressure, passes through the narrow throat, and escapes from the rear half. The airflow undergoes isentropic expansion within the Laval nozzle 9. The number of Laval nozzles 9 is not less than 4 (and is an even number), and they are axially and centrally symmetrical about the mainstream airflow direction in the circular pipe.

[0066] As an optional technical solution, such as Figures 1-2 As shown, in this embodiment, the geometric design of the Laval nozzle 9 ensures that the isentropic flow velocity in the front half of the converging pipe can and can only change continuously up to Ma (Mach number) = 1, so that the airflow in the Laval nozzle 9 changes from subsonic to sonic speed.

[0067] As an optional technical solution, the display control screen 11 in this embodiment is used for: (1) controlling the lifting adjustment structure 14 and setting the horizontal height of the lifting platform 17; (2) connecting to the actuator 13 via the connecting line 12, and controlling the pneumatic actuator 15 via the actuator 13 to realize the placement and retraction of the airflow injection component; (3) displaying the real-time pressure of compressed air at the equipment inlet; (4) displaying the transmission speed of the conveyor belt 10; and (5) displaying the simulated value of the tobacco material flow rate calibration. In the actual calibration process on site, the display control screen 11 can be operated with one button, which brings great convenience to the operator.

[0068] As an optional technical solution, such as Figure 2 As shown, in this embodiment, the stroke of the cylinder piston of the pneumatic actuator 15 enables the airflow injection component to rotate 60° or more.

[0069] As an optional technical solution, the actuator 13 is equipped with an emergency stop switch, which can retract the air jet component and cut off the compressed air at any time, so as to achieve flexible control of various risks caused by unknown factors in production and ensure production safety.

[0070] As an optional technical solution, the lifting platform 17 is installed on one side of the whole machine bracket 3 through the lifting adjustment structure 14, and the adjustment range of the lifting adjustment structure 14 is greater than 10cm.

[0071] like Figure 3 As shown in the figure, this embodiment of the invention also provides a method for calibrating a tobacco mass flow rate belt scale, including the following steps:

[0072] Step 1. Data Collection and Analysis: Collect various basic data, including but not limited to design drawings of the tobacco mass flow belt scale, operating data of the tobacco mass flow belt scale, and historical verification data of the traditional simulated load method; when using the data, carefully analyze and verify the data, carefully verify any problems found, and eliminate any possible errors and omissions.

[0073] Step 2. Preliminary Determination of Airflow Field Structure: Based on empirical values ​​of the required airflow rate and velocity injected onto the belt scale, combined with airflow characteristics, and taking into account friction loss and throttling loss, the preliminary airflow field structure is determined. The preliminary airflow field structure corresponds to the basic data of the belt scale for tobacco measurement.

[0074] Step 3. Model Establishment and Simulation Method Determination: Establish a three-dimensional physical model of the airflow inside and outside the injection component; based on simulation efficiency and tobacco flow rate calibration accuracy, select an appropriate control equation discretization method (finite difference method, finite element method, finite volume method), turbulence mathematical model, and flow field solution algorithm, and establish the CFD simulation software accordingly.

[0075] Step 4. Simulation solution: boundary constraint condition establishment and calculation region discretization; iterative solution and grid independence verification; simulation result storage, analysis and flow field structure optimization reconstruction.

[0076] Step 5. Auxiliary structure design: based on the simulation results of the air flow field, the corresponding auxiliary equipment structure is designed, including but not limited to the whole machine support 3, the lifting platform 17, the lifting adjustment structure 14, the pneumatic execution structure 15, the actuator 13, the injection component support rod 16, the fixed hinge 5, the pipeline fastening ring 1, the selection of appropriate flow balance valve 2, the soft connection pipe 4 and the display control screen 11.

[0077] Step 6. Modification implementation and application. The production line tobacco quality flow belt scale is modified and finally applied to the actual production process.

[0078] As a preferred embodiment of the present application, step Step 2 specifically includes the following steps:

[0079] Step 201. Preset the pressure of the injection air flow acting on the belt scale. According to the flow of tobacco material in the actual production process, the time-averaged pressure of the local area of the belt scale is determined, and the preset pressure of the injection air flow acting on the belt scale is determined accordingly.

[0080] Step 202. Determine the empirical value of the gas velocity at the outlet of the Laval nozzle 9. Assuming that the injection air flow acts on the belt without reverse speed (horizontal tangential flow), according to the law of conservation of momentum and combining the preset pressure acting on the belt scale, the empirical value of the gas velocity at the outlet of the Laval nozzle 9 is determined.

[0081] Step 203. According to the empirical value of the gas velocity at the outlet of the Laval nozzle 9, combined with the flow characteristics of the air flow, and taking into account various flow losses (friction loss coefficient, throttling loss coefficient), the flow field structure is preliminarily determined, including but not limited to the resistance coefficient of the flow balance valve 2, the ventilation degree of the air distribution plate, the number of Laval nozzles 9, the throat area of the Laval nozzle 9 and other cross-sectional areas along the way. The preliminary flow field structure corresponds to the basic data of the tobacco measuring belt scale.

[0082] As a preferred embodiment of the present application, step Step 4 specifically includes the following steps:

[0083] Step 401. Boundary constraint condition establishment and calculation region discretization. According to the actual boundary and the spatial influence region of the geometric body, the boundary constraint condition of the jet gas flow is determined. According to the region discretization method, the grid of each three-dimensional model section is divided according to the region. The calculation region includes but is not limited to the circular pipe section, the gradually expanding cavity 6, the air distribution plate, the free flow cavity 8, the Laval nozzle 9 and the transmission belt 10 end. The size of the gas flow field CFD calculation grid needs to be determined by comprehensively considering the accuracy of the gas phase field, the smoothness of the time and space variation and the consumption of the calculation. The grid density of the key regions such as the place where the flow field changes sharply (near the horizontal air distribution plate 7, inside the Laval nozzle 9) is improved to improve the numerical simulation accuracy.

[0084] Step 402. Iterative solution and grid independence verification: numerical iterative solution and grid sensitivity analysis are carried out to determine the best CFD grid size of the gas phase field, and the grid independence verification is carried out. If the requirement is met, the next step is entered; otherwise, the calculation grid needs to be modified, and the step Step 401 is jumped to.

[0085] Step 403. Simulation result storage, analysis and flow field structure optimization reconstruction: store and analyze the simulation simulation result, determine the relationship between the device inlet pressure and the pressure value of the gas flow jet on the belt scale, and finally convert it into the relationship between the device inlet pressure and the simulated value of the tobacco flow, and optimize and reconstruct the structure of each component. If the design requirement is met, the next step is entered; otherwise, the structure size of each component needs to be modified, and the step Step 201 is jumped to.

[0086] The detection device is suitable for accurate calibration of the tobacco mass flow belt scale in the tobacco making workshop of each cigarette factory. The device can be permanently installed on the tobacco measuring belt scale, and can meet the frequent calibration of the tobacco mass flow belt scale.

[0087] Taking the calibration of the tobacco mass flow belt scale in the tobacco making workshop of a cigarette factory as an example. The three-dimensional numerical simulation process of the tobacco mass flow belt scale calibration based on CFD provided by the application comprises:

[0088] Step 1. Collection and analysis of data: collect basic data, and carefully analyze and check the data.

[0089] Step 201. According to the flow of tobacco material in the actual production process, the time-averaged pressure received by the local region of the belt scale is determined to be 500 Pa, and the preset pressure of the jet gas acting on the belt scale is determined accordingly.

[0090] Step 202. Assume that the jet gas acts on the belt without reverse speed (horizontal tangential flow), and according to the momentum conservation law and the preset pressure acting on the belt scale, the empirical value of the gas velocity at the outlet of the Laval nozzle 9 is determined to be 150 m / s.

[0091] Step 203. Preliminary determination of air flow field structure: According to the required air flow rate and flow rate experience value sprayed on the belt scale, combined with the flow characteristics of the air flow, and taking into account the flow loss along the way, the preliminary determination of the air flow field is as follows:

[0092] (1) The air flow rate is initially determined to be 0.4 m 3 / s (normal pressure).

[0093] (2) The flow loss coefficient along the way is 0.05, and the throttling loss coefficient is 0.5.

[0094] (3) The inner diameter of the compressed air inlet connection end 18 is φ = 110 mm.

[0095] (4) The length of the upper bottom of the diverging cavity 6 is 130 mm, the length of the lower bottom is 200 mm, and the height is 130 mm.

[0096] (5) The radius of the circular hole of the horizontal air distribution plate 7 is 8 mm, the number of holes is 100, and the holes are evenly distributed along the plate surface. The air distribution plate has a ventilation degree of 50%.

[0097] (6) The free flow cavity 8 has a height of 200 mm.

[0098] (7) The number of Laval nozzles 9 is 4, which is symmetric about the axis of the main flow direction of the air flow in the circular tube and is centrally symmetric.

[0099] (8) The cross-sectional radius of the Laval nozzle 9 at the inlet is 20 mm, the cross-sectional radius of the throat is 10 mm, and the cross-sectional radius of the outlet is 25 mm. The length of the narrow-throat cross-section of the Laval nozzle 9 from the inlet cross-section is 100 mm, and the length of the narrow-throat cross-section of the Laval nozzle 9 from the outlet cross-section is 300 mm. The distance between the outlet of the Laval nozzle 9 and the belt is 35 mm.

[0100] (9) The resistance coefficient of the flow balance valve 2 is 0.05.

[0101] Step 3. Model establishment and simulation method determination: A three-dimensional physical model of the area inside and outside the air flow in the injection component is established; according to the simulation efficiency and the accuracy of the tobacco flow calibration, the discrete method of the control equation is selected as the finite volume method, the turbulence mathematical model adopts the Standard k-ε model, the flow field solving algorithm adopts the SIMPLE algorithm, the near-wall function adopts the solid non-slip wall function, and the CFD simulation software adopts the OpenFoam open source software.

[0102] Step 401. Boundary constraint condition establishment and calculation region discretization. According to the actual boundary and the spatial influence region of the geometric body, the boundary constraint condition of the jet gas flow is determined. The air inlet is the "pressure inlet boundary condition", and the outlet is the "free flow boundary condition". According to the region discretization method, the grid of each section of the three-dimensional model is divided according to the region division, as shown in Figure 4 . The grid density of the key regions where the flow field changes sharply (near the horizontal air distribution plate 7, inside the Laval nozzle 9) is increased. The total number of grids is 67.73 million, there are 145.67 million faces and 19.18 million nodes. The minimum grid volume is 6.04 x 10 -10 m 3 , and the maximum grid volume is 8.73 x 10 -7 m 3 .

[0103] Step 402. Iterative solution and grid independence verification: numerical iterative solution and grid sensitivity analysis are performed to determine the best CFD grid size of the gas phase field and to realize the grid independence verification. The size of the CFD calculation grid of the gas flow field needs to be determined by considering the accuracy of the gas phase field, the smoothness of the time and space variation, and the calculation cost. In the simulation, three different sizes of CFD grids are tested, and finally it is found that the calculation domain containing 67.73 million CFD unit cells achieves the best balance between precision and calculation cost.

[0104] Step 403. Simulation result storage, analysis and flow field structure optimization reconstruction. The simulation results are shown in Figure 5 . In the figure, the upper half is a schematic diagram of the center section of the device, and the gas velocity scale is contour 1; the lower half is a schematic diagram of the center section of the Laval nozzle, and the gas velocity scale is contour 2.

[0105] Step 5. Auxiliary structure design: based on the simulation and simulation results of the gas flow field Figure 5 ), the corresponding auxiliary device structure is designed, including but not limited to the whole machine support 3, the lifting platform 17, the lifting adjustment structure 14, the pneumatic execution structure 15, the actuator 13, the jet component support rod 16, the fixed hinge 5, the pipeline fastening ring 1, the selection of appropriate flow balance valve 2, soft connection pipe 4 and display control screen 11.

[0106] Step 6. Modification implementation and application.

[0107] Obviously, the above merely describes the preferred embodiments of the present application and the principles of the applied technology. It is understood by those skilled in the art that the present application is not limited to the specific embodiments herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.

[0108] Note that in the description of the specification, descriptions with reference to the terms "some embodiments", "other embodiments", and the like, mean that the specific features, structures, materials or characteristics described in conjunction with these embodiments or examples are in some way included in at least one embodiment or example of the present application. Descriptions of the above terms in the specification do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A calibration device for a tobacco mass flow rate belt scale, characterized in that, Includes pipe fastening rings, flow balancing valves, machine brackets, flexible connecting pipes, fixed hinges, diffuser chambers, horizontal air distribution plates, free flow chambers, Laval nozzles, display and control panels, connecting cables, actuators, lifting and adjusting structures, pneumatic actuator structures, injection component support rods, lifting platforms, and compressed air inlet connection terminals. The main frame is fixed above the transmission belt, and the inner side of the pipeline fastening ring wraps around the compressed air inlet connection end, while the outer side connects to the main frame. One end of the compressed air inlet connection is connected to compressed air, and the other end is connected to the flow balance valve; The flow balance valve is connected to the flexible connecting pipe. The lower side of the flexible connecting pipe is connected to the diffuser chamber through a round pipe. A horizontal air distribution plate is arranged at the tail end of the diffuser chamber. The lower end of the horizontal air distribution plate is connected to the free flow chamber. The free flow chamber is connected to the Laval nozzle. The lifting platform is installed on one side of the main frame. The horizontal height of the lifting platform is adjusted by the lifting adjustment structure on the lifting platform. The display control screen is connected to the actuator through the connecting line, and the actuator controls the pneumatic actuator to make the cylinder of the pneumatic actuator contract or expand. The air jet component and the lifting platform are connected to the pneumatic actuator structure via fixed hinges, and the jet component support rod and the air jet component are connected via fixed hinges. The free-flowing cavity is a hollow cuboid structure with a height not less than that of the gradually expanding cavity. The stroke of the cylinder piston in the pneumatic actuator enables the airflow injection component to rotate by not less than 60°.

2. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, A soft pad ring is installed between the inner side of the pipeline fastening ring and the compressed air inlet connection end of the pipeline to reduce the impact of vibration caused by the pneumatic actuator on the pipeline. The inner diameter of the pipeline fastening ring can be adjusted by bolt fasteners.

3. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, The flow balance valve uses a pneumatic regulating valve to ensure the food safety requirements of tobacco used as a food product. The flow accuracy of the flow balance valve is within 5%.

4. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, The expanding cavity has a regular square truncated pyramid structure with a square upper and lower base. The side length of the upper base is greater than the outer diameter of the connecting circular tube; the side length of the lower base is 1.5 times the side length of the upper base; and the height of the regular square truncated pyramid is not less than the side length of the upper base.

5. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, A horizontal air distribution plate is a geometric structure with evenly spaced circular holes on a horizontal plate. The ventilation of the horizontal air distribution plate is ≥50% to ensure that the throttling loss of the air distribution plate is within a reasonable range. The radius of the circular holes is ≤8 mm, and the number of holes is set according to the ventilation.

6. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, The front half of the Laval nozzle narrows towards the middle to form a narrow throat, and then expands outwards to the bottom of the nozzle. The gas in the pipe flows into the front half of the nozzle under high pressure, passes through the narrow throat, and escapes from the rear half. The airflow undergoes an isentropic expansion process in the Laval nozzle. The number of Laval nozzles is an even number greater than or equal to 4. The nozzles are axially and centrally symmetric about the direction of the mainstream airflow in the circular pipe.

7. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, The geometric design of the Laval nozzle ensures that the isentropic flow velocity in the front converging duct can and can only change continuously up to Ma=1, allowing the airflow to change from subsonic to sonic speeds within the Laval nozzle.

8. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, An emergency stop switch is installed on the actuator, which can retract the air jet component and cut off the compressed air at any time.

9. The tobacco mass flow rate belt scale calibration device according to claim 1, characterized in that, The lifting platform is installed on one side of the main frame via a lifting adjustment structure, and the adjustment range of the lifting adjustment structure is greater than 10 cm.

10. A method for calibrating a tobacco mass flow rate belt scale, wherein the method is applied to the tobacco mass flow rate belt scale calibration device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1. Data Collection and Analysis: Collect various basic data, including design drawings of the tobacco mass flow belt scale, operating data of the tobacco mass flow belt scale, and historical verification data of the traditional simulated load method. When using the data, carefully analyze and verify it, carefully examine any problems found, and eliminate any possible errors and omissions. Step 2. Preliminary determination of airflow field structure: Based on the empirical values ​​of the airflow rate and velocity required to be sprayed onto the belt scale, combined with the airflow characteristics, and taking into account the flow loss along the flow path and the throttling loss, the airflow field structure is initially determined. The preliminary determined flow field structure corresponds to the basic data of the belt scale for measuring tobacco. Step 3. Model Establishment and Simulation Method Determination: Establish a three-dimensional physical model of the area inside and outside the jet component where the airflow is located; based on the simulation efficiency and the calibration accuracy of the tobacco flow rate, select the control equation discretization method, turbulence mathematical model and flow field solution algorithm, and determine the CFD simulation software accordingly; Step 4. Simulation and Solution: Establishing boundary constraints and discretizing the computational domain; iterative solution and verification of mesh independence; Simulation results storage, analysis, and flow field structure optimization and reconstruction; Step 5. Auxiliary Structure Design: Based on the airflow field simulation results, design the corresponding auxiliary equipment structure, including the whole machine bracket, lifting platform, lifting adjustment structure, pneumatic actuator, actuator, jet component support rod, fixed hinge, pipeline fastening ring, and select appropriate flow balance valve, flexible connection pipe and display control panel; Step 6. Modification and Application: Modify the belt scale for the mass flow rate of tobacco shreds on the production line and apply it to the actual production process.

11. The calibration method for a tobacco mass flow rate belt scale according to claim 10, characterized in that, Step 2 specifically includes the following steps: Step 201. Preset the pressure of the jet airflow acting on the belt scale. Based on the flow rate of tobacco material in the actual production process, determine the average pressure of the local area of ​​the belt scale, and use this as the preset pressure of the jet airflow acting on the belt scale. Step 202. Determine the empirical value of the gas velocity at the Laval nozzle exit. Assuming that the jet gas has no reverse velocity after acting on the belt, determine the empirical value of the gas velocity at the Laval nozzle exit based on the law of conservation of momentum and in conjunction with the preset pressure acting on the belt scale. Step 203. Based on the empirical value of the outlet gas velocity of the Laval nozzle, combined with the airflow characteristics, and taking into account various flow losses, the airflow field structure is initially determined, including the flow balance valve resistance coefficient, the ventilation of the air distribution plate, the number of Laval nozzles, the throat area of ​​the Laval nozzle, and the cross-sectional area of ​​other sections along the flow path. The initial flow field structure corresponds to the basic data of the tobacco measuring belt scale.

12. The method for calibrating a belt scale for tobacco mass flow rate according to claim 11, characterized in that, Step 4 specifically includes the following steps: Step 401. Establishing Boundary Constraints and Discretizing the Computational Domain: Based on the actual boundary and the spatial influence area of ​​the geometry, determine the boundary constraints of the jet flow. According to the domain discretization method, divide the 3D model into grids for each segment. The computational domain includes the circular pipe segment, the diffuser, the air distributor, the free flow cavity, the Laval nozzle, and the end of the conveyor belt. The size of the CFD computational grid for the airflow field needs to be determined by comprehensively considering the accuracy of the gas phase field, the smoothness of time and space changes, and the computational cost. Increase the grid density in key areas where the flow field changes drastically to improve the accuracy of the numerical simulation. Step 402. Iterative Solution and Mesh Independence Verification: Numerical iterative solution is performed, and mesh sensitivity analysis is conducted to determine the optimal CFD mesh size for the gas phase field, thus verifying mesh independence. If the requirements are met, proceed to the next step; otherwise, the computational mesh needs to be modified, and the process should proceed to Step 401. Step 403. Simulation results storage, analysis, and flow field structure optimization and reconstruction: Store and analyze the simulation results, determine the relationship between the equipment inlet pressure and the pressure value of the airflow injected onto the belt scale, and finally convert it into the relationship between the equipment inlet pressure and the simulated value of the tobacco flow rate. Based on this, optimize and reconstruct the structure of each component. If the design requirements are met, proceed to the next step; otherwise, modify the structural dimensions of each component and jump to Step 201.

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