Optimization method for attaching D-shaped heat exchange tube of freeze dryer to wall around barrel

Abstract

The invention provides a freeze dryer D-shaped heat exchange tube barrel-winding wall-attaching optimization method which is suitable for the freeze dryer manufacturing field and comprises the steps of assembling an intelligent barrel-winding device, determining a control relation, setting control logic and executing production, and the intelligent barrel-winding device comprises a forming assembly, a rotating assembly, a lifting assembly and a control system. The step of determining the control relation comprises the substeps of determining the inherent rotation resistance torque, determining the relation between the pressing die pressure of the forming assembly and the passing resistance of the heat exchange tube and determining the relation between the distance measurement difference value and the needed pressing die pressure; the control system detects the distortion condition of the heat exchange tube with the D-shaped section, adjusts the pressing die pressure of the forming assembly and the winding torque of the rotating assembly on the heat exchange tube with the D-shaped section in real time, automatically overcomes distortion deformation of the heat exchange tube with the D-shaped section to a corresponding degree, reduces the drum-winding and wall-adhering reject ratio of the heat exchange tube with the D-shaped section, and improves the production efficiency. And the quality inspection and repair cost in the manufacturing process of the freeze-drying barrel of the food freeze dryer is greatly reduced.

Description

Technical Field

[0001] The invention relates to the manufacturing field of food freeze dryers, and in particular to a method for optimizing the attachment of a D-shaped heat exchange tube of a freeze dryer to a barrel wall. Background Art

[0002] The freeze drying barrel, the core component of the freeze dryer, is mainly composed of a barrel body and a heat exchange tube spirally wound thereon. The effective contact area of ​​the heat exchange tube wound on the outer wall of the barrel body directly determines the heat exchange efficiency of the freeze drying barrel. At present, freeze dryer manufacturers on the market are competing to develop manufacturing and processing methods to increase the effective contact area between the heat exchange tube per unit length and the barrel body, so as to improve the energy consumption level of the freeze dryer and reduce the material input of the heat exchange tube under the same freeze dryer output. A heat exchange tube with a D-shaped cross-section is used, and the plane of the D-shaped cross-section heat exchange tube is used to make surface contact with the barrel body. Compared with the linear contact between the circular cross-section heat exchange tube and the barrel body, the effective contact area and heat exchange efficiency are greatly increased.

[0003] A Chinese patent with publication number CN115121718A discloses a device for extruding a circular cross-section heat exchange tube into a D-shaped cross-section heat exchange tube before winding it around the barrel body, which can realize the efficient and low-cost application of the D-shaped cross-section heat exchange tube in the freeze dryer. However, due to the occasional uneven stress and material distortion of the circular cross-section heat exchange tube as the raw material during the manufacturing and coil packaging process, the D-shaped cross-section heat exchange tube extruded by the device occasionally has a phenomenon of rotational distortion of the D-shaped cross-section of some sections, causing the corresponding section of the heat exchange tube to have poor wall adhesion after being wound around the barrel body. After the barrel body is made into a freeze dryer, the D-shaped cross-section heat exchange tube will be missing at the corresponding position of the spiral strip of frost in the barrel after each freeze-drying of food. The missing length is greater than the frost width. Therefore, it is one of the manufacturing quality indicators strictly controlled by freeze dryer manufacturers. The existing technology lacks a method to automatically detect and reduce the poor adhesion of D-section heat exchange tubes around the barrel wall. The defect rate is about 4‰, which adds a lot of additional quality inspection and rework costs to manufacturers, limiting the promotion and application of D-section heat exchange tubes in the freeze dryer industry.

[0004] Therefore, it is urgent to design an optimization method for the D-shaped heat exchange tube of the freeze dryer to adhere to the barrel wall. Summary of the invention

[0005] The purpose of the present invention is to provide a method for optimizing the D-shaped heat exchange tube of a freeze dryer to adhere to the barrel wall, so as to solve the existing technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A freeze dryer D-shaped heat exchange tube barrel wall optimization method, comprising the following steps:

[0008] S1 assembles the intelligent barrel winding device;

[0009] The intelligent barrel winding device includes a forming component, a rotating component, a lifting component and a control system;

[0010] The molding assembly includes a fixed frame, a moving part slidably connected to the fixed frame, a die wheel and a distance sensor connected to the fixed frame, and a die wheel connected to the moving part, wherein the die wheel is used to accommodate a heat exchanger, and the moving part can drive the die wheel to approach or move away from the die wheel. When the die wheel approaches the die wheel, the die wheel and the die wheel enclose a D-shaped molding cavity, the height of the D-shaped molding cavity gradually decreases from one end to the other end along the length direction, and the die wheel can squeeze the heat exchanger located in the D-shaped molding cavity; the moving part is driven by an electric push rod cylinder, the cylinder body of the electric push rod cylinder is fixedly connected to the fixed frame, the extending shaft of the electric push rod cylinder is fixedly connected to the moving part, and the electric push rod cylinder is equipped with a pressure sensor, both of which are electrically connected to the control system to transmit the pressure information of the electric push rod cylinder to the control system in real time;

[0011] The rotating assembly is equipped with a barrel of a freeze dryer, which can drive the barrel to rotate around the axis of its own cylinder. A barrel wall of the barrel is connected to one end of the heat exchange tube. When the rotating assembly rotates, the heat exchange tube is driven to move from the end with a larger height of the D-shaped cavity to the other end, so that the circular cross-section heat exchange tube is extruded by the molding assembly to become a D-shaped cross-section heat exchange tube. The D-shaped cross-section heat exchange tube is wound around the barrel wall of the barrel under the continuous drive of the rotating assembly. The rotating assembly is driven by a motor equipped with an encoder. The motor and its encoder are both electrically connected to the control system, and the rotation position and speed information of the rotating assembly are transmitted to the control system in real time.

[0012] There are two distance measuring sensors, all of which are installed on the fixed frame. The two distance measuring sensors are located outside the D-shaped cavity, and the distance measuring ray direction is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube; the distance measuring points of the two distance measuring sensors are set on the plane of the D-shaped cross-section heat exchange tube, and the connecting line of the two distance measuring points is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube. When the D-shaped cross-section heat exchange tube is not twisted, the distance measuring values ​​of the two distance measuring sensors are equal. When the D-shaped cross-section heat exchange tube is twisted around the moving direction, the distance measuring value of one of the distance measuring sensors increases while the other decreases; the two distance measuring sensors are electrically connected to the control system to transmit the distance measuring information to the control system in real time;

[0013] The lifting assembly can drive the molding assembly as a whole to perform lifting motion perpendicular to the moving direction of the D-shaped cross-section heat exchange tube, and together with the rotating assembly, drives the D-shaped cross-section heat exchange tube to be spirally wound on the barrel wall of the barrel body; the lifting assembly is driven by a motor equipped with an encoder, and the drive motor and its encoder are both electrically connected to the control system, and the height information of the lifting assembly can be transmitted to the control system in real time;

[0014] S2 determines the control relationship;

[0015] Determination of the control relationship includes determining the inherent rotational resistance torque, determining the relationship between the resistance of the heat exchange tube passing through the molding component and the die pressure, and determining the relationship between the distance measurement difference and the required die pressure;

[0016] S201 determines the inherent rotational resistance torque;

[0017] Determine the inherent rotational resistance torque M of the rotating component 固阻 The steps are:

[0018] a) pulling one end of the circular cross-section heat exchange tube out of the raw material tube tray, and directly fixing the heat exchange tube at this end to the barrel wall without passing through the forming assembly;

[0019] b) setting the driving motor of the rotating assembly to a speed control mode in the control system;

[0020] c) about the normal speed ω of the rotating component 常 Select several speeds with the same intervals in the upper and lower ranges as the test speeds, start the heat exchange tube winding process, and collect the average operating power of the driving motor of the rotating component at different speeds, ω 常 It is the conventional production speed set for mass production of the D-shaped cross-section heat exchange tube winding device which does not have the wall-adhering optimization function under the existing technology;

[0021] d) Using the control system to collect the average operating power P of the driving motor of the rotating assembly during each test i ,calculate Where i is the test order, P i The unit is W, ω i The unit is rad / s, M 固阻 The unit is Nm;

[0022] S202 determines the relationship between the die pressure of the molding component and the resistance of the heat exchange tube;

[0023] Determine the die pressure F of the molded component 压 and the resistance F of the molded component to the passage of the heat exchange tube 阻 The steps of the relationship are:

[0024] a) pulling one end of the circular cross-section heat exchange tube out from the raw material tube tray, passing through the forming assembly and fixing the heat exchange tube at this end on the barrel wall,

[0025] b) in the control system, setting the driving motor of the rotating component to a speed control mode and setting the electric push rod cylinder of the forming component to a torque control mode;

[0026] c) Select the conventional compression molding pressure F from the molding component 压常 The pressure values ​​which increase gradually and are equally spaced are used as the test die pressure, and are set in the control system in order from small to large as the output pressure of the electric push rod cylinder, and the normal speed of the rotating component ω 常 Set the test speed, start the heat exchange tube winding process, and collect different die pressures F 压j The average operating power P of the driving motor of the rotating assembly is j , where j is the test number, and the conventional die pressure F 压常 The die pressure during mass production of a D-shaped cross-section heat exchange tube winding device that does not have the wall-adhering optimization function under the prior art;

[0027] d) After each test, the average operating power P of the driving motor of the rotating component collected is j Compared with the rated power of the motor P 额 , make the following judgment:

[0028] If P j Less than or equal to P 额 , then the resistance of the heat exchange tube tested in this test passing through the molding component

[0029] F 阻j =(P j / ω 常 -M 固阻 ) / R;

[0030] If P j Greater than P 额 , the rotation speed of the rotating assembly is continuously reduced during the test so that the actual operating power of the rotating assembly driving motor of the test is stabilized at P 额 , the control system reads the average speed value ω of the rotating component at this time j , then the resistance F of the heat exchange tube in this test passing through the molding assembly 阻j =(P 额 / ω j -M 固阻 ) / R;

[0031] The above R is the radius of the barrel, in m; the test result is recorded as (F 压j , F 阻j);

[0032] e) Using polynomial fitting (F 压j , F 阻j ), we get F 阻 =f(F 压 ) and F 压 =f'(F 阻 )express;

[0033] Preferably, the degree of the polynomial is less than or equal to 3;

[0034] f) After the test, inspect and analyze the appearance and cross-sectional shape of the D-shaped tube formed by each die pressure, and determine the maximum die pressure F suitable for D-shaped tube barrel winding according to product performance requirements. 压max .

[0035] S203 determines the relationship between the distance measurement difference and the required die pressing pressure;

[0036] The steps to determine the relationship between the distance measurement difference and the required die pressure are:

[0037] a) Test preparation: pull one end of the circular cross-section heat exchange tube out from the raw material tube plate, pass it through the molding assembly and fix the end of the heat exchange tube on the barrel wall; set the driving motor of the rotating assembly to speed control mode in the control system and set the electric push rod cylinder of the molding assembly to torque control mode; select the conventional die pressure F of the molding assembly 压常 The pressure values ​​that start to increase gradually and are equally spaced are used as the test die pressure values, and are set in the control system in order from small to large as the output pressure F of the electric push rod cylinder. 压m , where m is the test sequence number of this step; in each test, the speed setting of the rotating component follows the following judgment logic:

[0038] When F 压m Less than or equal to F 压阈 When the test speed of the rotating component is ω m Set to ω m =ω 常 ;

[0039] When F 压m Greater than F 压阈 When the test speed of the rotating component is ω m Set to

[0040] where F 压阈 =f'[P 额 / ω 常 -M 固阻 ) / R],F 压 =f'(F 阻) is the quantitative relationship between the die pressure of the molding assembly and the resistance of the heat exchange tube passing through the molding assembly obtained in step S202 of the method;

[0041] b) Data acquisition: The control system records the distance values ​​l1 and l2 of the distance measuring sensor and the pressure value F of the electric push rod cylinder received at the same time during the test according to the sampling period t. 压 , the rotation position value θ of the rotating component and the height value h of the lifting component, and attach the data recording date and time to form a collection data information d 采mn =(l 1mn , l 2mn , F 压mn ,θ mn ,h mn , T mn ), represents the data collected at the nth time of the mth test; d 采mn Derive and convert l1 and l2 into the absolute value of the distance difference |Δl| to form d 存mn =(|Δl mn |, F 压mn ,θ mn ,h mn , T mn );

[0042] Preferably, the data sampling period t is selected to be less than or equal to 50% of the time required for the D-shaped cross-section heat exchange tube to move a distance equal to the width of the D-shaped tube forming plane, so that the collected data can include information on the twisting of the D-shaped tube whose twisting length is as short as the width of the D-shaped tube;

[0043] c) Data preprocessing, all data tables {d 采m} data l1 and l2 are converted into the absolute value of the distance difference |Δl|, and θ mn Transformed into θ' mn =θ mn + L / R, where L is the distance between the tangent point of the D-shaped cross-section heat exchange tube and the barrel and the distance measurement point, and R is the radius of the barrel, and the data d is obtained. 存mn =(|Δl mn |, F 压mn ,θ' mn ,h mn , T mn ) and its constituent data tables {d 存m}, m is the test sequence number;

[0044] For each table {d 存m The |Δl| values ​​of the data are checked by K-Means anomaly, and the data identified as outliers by |Δl| are archived as a new data table {d 待m}, m is the test sequence number;

[0045] d) Data analysis: Compare each group of poorly adhered products with the data {d 待m}θ' mn ,h mn , T mn and |Δl mn | value comparison, according to the processing time and location of poorly adhered products, determine {d 待m The data related to poor adhesion in the 不良m and the dataset {d 不良m}, m is the test sequence number;

[0046] All data tables {d 不良m The |Δl| values ​​of the data are listed in ascending order and duplicate values ​​are removed to form a queue {|Δl k |}, k = 1 to x, where x is the queue {|Δl k |} the number of data; {|Δl k |} each |Δl k | The value is cycled in turn with each data table from small to large {d 不良m} Make a comparison and make a judgment:

[0047] If a {d 不良m}There is a certain data |Δl mn |Value is less than or equal to |Δl k |, then stop |Δl k |with{d 不良m}, and start the comparison of |Δl k |With the next data set {d 不良m+1} comparison;

[0048] If a {d 不良m} of all data in |Δl mn |values ​​are all greater than |Δl k |, then stop |Δl k | and put this data table {d 不良m F in 压 With |Δl k | is recorded as a piece of data (|Δl k |, F 压k ), and record 1 successful search, and then start the next |Δl k+1 |Comparison;

[0049] Until a certain |Δl k |With all datasets {d 不良m}Comparison without any data set full |Δl mn |are both greater than |Δl k |, the loop comparison ends.

[0050] Get a set of data (|Δl k |, F 压k ), k is the comparison success sequence number;

[0051] Using the exponential function y=ab x Fitting data set (|Δl k |, F 压k ),get

[0052] F 压 =g(|Δl|)=ab |Δl| , the valid range is 0 <F 压 <F 压max

[0053] Where a and b are adjustment coefficients; the relationship |Δl| represents the degree of distortion of a certain section of the D-shaped tube (the D-shaped cross section produces a distance difference of |Δl for the distance sensor). x | deflection), F 压 Indicates the die pressure that causes the rotating component to generate the required torque in the speed control mode (the required torque is the magnitude of the rotating component when the winding twist degree is |Δl x |D-shaped tube);

[0054] S3 sets the control logic;

[0055] In the control system, the driving motor of the rotating component is set to the speed control mode, the driving motor of the moving part of the molding component is set to the torque control mode, and the initial die pressure of the production process is set to F 压0 =F 压常 、The initial speed is ω0=ω 常 ;

[0056] The control system is preset with the calculation logic F obtained in step S203 压 =g(|Δl|)=ab |Δl| , effective range 0 <F 压 <F 压max The control system is based on the distance difference value |Δl collected in real time by the ranging sensor t |, continuously calculate the corresponding required die pressure value F 压t , t is the real-time collection sequence number, and F 压t and the initial die pressure value F 压0 Compare and execute the following first judgment logic:

[0057] When F 压t Less than or equal to F 压0 When the control system determines that the current D-shaped tube distortion will not cause poor wall adhesion, the control system maintains the current state and continues to operate;

[0058] When F 压t Greater than F 压0 When the control system determines that the current D-shaped tube distortion may cause poor wall adhesion, the die pressure will be increased to increase the resistance of the molding assembly to the passage of the heat exchange tube, thereby increasing the rotational resistance torque of the rotating assembly; the driving motor of the rotating assembly will automatically increase the motor driving torque in the speed control mode of the control system to balance the current rotational resistance torque so that the motor running speed is maintained at the set speed, thereby increasing the ability to overcome the distortion of the D-shaped tube;

[0059] After completing the first judgment logic, the control system will set F 压t The preset die pressure threshold F 压阈 For comparison:

[0060] When F 压t Less than or equal to F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly does not exceed its rated power P after the die pressure increases, 额 , the control system does not execute the power limiting logic, that is, only the die pressure is adjusted this time;

[0061] When F 压t Greater than F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly will exceed its rated power P after the die pressure increases, 额 , the control system will execute the power limiting logic, that is, the die pressure is increased and the speed of the rotating component is reduced to The die pressure threshold F 压阈 =f'[(P 额 / ω0-M 固阻 ) / R];

[0062] After completing the second judgment logic, the control system will 压t and maximum die pressure F 压max Compare and execute the following third judgment logic:

[0063] When F 压t Less than or equal to F 压max When the control system uses F 压t The output value of the current die pressure adjustment value;

[0064] When F 压t Greater than F 压max When the control system uses F 压max It is the output value of the current die pressure adjustment value, and marks the barrel currently being produced after the die pressure increase is completed, so that it can enter the subsequent wall adhesion full inspection process;

[0065] Each increase in die pressure is maintained until the deflection of the D-shaped tube |Δl triggers the increase in die pressure. t | is wound around the barrel until the length is sufficient, and after completion, the die pressure returns to the initial value F 压0 ;

[0066] S4 production execution;

[0067] One end of the heat exchange tube is pulled out from the incoming tube coil, passes through the forming assembly and fixes the formed D-shaped tube on the barrel wall of the barrel body, and the barrel winding device for preventing the D-shaped tube from poorly adhering to the wall is operated. The barrel winding device for preventing the D-shaped tube from poorly adhering to the wall completes the production process of winding the D-shaped tube around the barrel body according to the control logic set in step S3 of the method.

[0068] The beneficial effects of the present invention are:

[0069] The present invention uses a distance measuring sensor group to monitor the deflection of the D-shaped cross section of the D-shaped heat exchange tube in the monitoring point section in real time, so as to achieve the purpose of detecting whether the D-shaped tube is abnormally twisted in real time; in the collection of abnormal twist of the D-shaped tube and related data information, the angle value of the rotating component and the height value information of the lifting component are attached to each data information, so as to facilitate the rapid finding of defective products and their defective parts in the test phase during data analysis, and realize the correlation analysis of each wall-attaching defective part in the test with the corresponding collected data, which greatly reduces the required data collection amount; by establishing a quantitative relationship between the die pressure of the molding component and the twisting program of the D-shaped tube, the system automatically adjusts the rotation torque of the rotating component to wind the D-shaped tube when abnormal twist of the D-shaped tube is detected, so that the twisted D-shaped tube can recover autonomously during the barrel body winding process, thereby greatly reducing the probability of the wall-attaching defective problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 This is a flow chart of the optimization method for D-shaped heat exchange tubes of a freeze dryer to adhere to the barrel wall of the present invention;

[0071] Figure 2 This is a schematic diagram of the structure of the intelligent barrel winding device according to an embodiment of the present invention;

[0072] Figure 3 This is a schematic diagram of the structure of the forming assembly of the intelligent barrel winding device of this embodiment;

[0073] Figure 4 is the distance difference |Δl| and the die pressure F in this embodiment 压 Relationship diagram;

[0074] In the figure, 1-molding component, 101 fixed frame, 102-moving part, 103-guide rail, 104-slider, 105-die wheel, 106-die wheel shaft, 107-die wheel, 108-die wheel shaft, 109-guide wheel, 110-guide wheel shaft, 111-electric push rod cylinder, 112-distance sensor, 2-rotating component, 201-rotating device, 202-clamping device, 3-lifting component, 301-lifting frame, 302-guide rail, 303-lifting drive motor, 4-workbench, 5-column, 6-beam, 7-barrel body. DETAILED DESCRIPTION

[0075] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments given here are only used to illustrate and explain the present invention, and cannot be used to limit the present invention.

[0076] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention may also have other implementations and variations thereof. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0077] like Figures 1 to 4 As shown, a freeze dryer D-shaped heat exchange tube barrel wall optimization method includes the following steps:

[0078] S1 assembles the intelligent barrel winding device;

[0079] refer to Figures 2 to 4 The intelligent barrel winding device includes a forming component 1, a rotating component 2, a lifting component 3, a workbench 4, a column 5, a beam 6 and a control system; the column 5 is vertically fixed to the table surface of the workbench 4 by bolts, and the beam 6 is fixed to the column by bolts and is parallel to the plane of the workbench 4;

[0080] The molding assembly 1 includes a fixed frame 101, a moving part 102, a die wheel 105, a die wheel 107, a guide wheel 109 and a distance sensor group 112; the fixed frame 101 has a guide rail 103 fixedly connected by bolts, and the moving part 102 has a slider 104 connected by bolts. The size of the slider 104 matches the guide rail 103 and can slide on the guide rail 103, so that the moving part 102 can slide on the fixed frame 101. The number of the guide rail 103 and the slider 104 are both 2; the center holes of the die wheel 105, the die wheel 107 and the guide wheel 109 are respectively connected to the corresponding die wheel shaft 106, the die wheel shaft 108 and the guide wheel shaft 110 by interference fit, and both ends of the die wheel shaft 106 and the guide wheel shaft 110 are connected to the fixed frame 101 by interference fit, and both ends of the die wheel shaft 108 are connected to the moving part 102 by interference fit. The movable part 102 is connected with the die wheel 105; the die wheel 105 is used to accommodate the heat exchange pipe, and the movable part 102 can drive the die wheel 107 to approach or move away from the die wheel 105. When the die wheel 107 approaches the die wheel 105, the die wheel 107 and the die wheel 105 enclose a D-shaped molding cavity, and the height of the D-shaped molding cavity gradually decreases from one end to the other end along the length direction, and the die wheel 107 can squeeze the heat exchange pipe located in the D-shaped molding cavity; the movable part 102 is driven by an electric push rod cylinder 111, and the cylinder body of the electric push rod cylinder 111 is fixed to the fixed frame 101 by bolts, and the extending shaft of the electric push rod cylinder 111 is fixed to the movable part 102 by bolts, and the electric push rod cylinder 111 is equipped with a pressure sensor, and the electric push rod cylinder 111 and its pressure sensor are electrically connected to the control system, and the pressure information of the electric push rod cylinder 111 can be transmitted to the control system in real time.

[0081] In this embodiment, the number of guide wheels is 2, the number of die wheels 105 and die wheels 107 are both 3, and the barrel is a metal barrel.

[0082] The rotating assembly 2 includes a rotating device 201 and a clamping device 202; the rotating device 201 passes through the mounting hole of the workbench 4 and is fixed to the workbench 4 with bolts, and a disc is provided at the top of the rotating device 201 to install and fix the barrel 7; the rotating device 201 is powered by a driving motor equipped with an encoder, and the driving motor and its encoder are both electrically connected to the control system, and can transmit the rotation position and speed information of the rotating assembly 2 to the control system in real time; the clamping device 202 passes through the mounting hole of the crossbeam 6 and is fixed to the crossbeam 6 with bolts, The pressing device 202 can be extended and retracted up and down, and when it reaches the lowest point, it can press the barrel body 7 fixed on the rotating device 201; the rotating component 2 can drive the barrel body 7 to rotate around the axis of its own cylinder, and a part of the barrel wall of the barrel body 7 is connected to one end of the heat exchange tube. When the rotating component 2 rotates, it drives the heat exchange tube to move from the end with a larger height of the D-shaped cavity of the forming component 1 to the other end, so that the circular cross-section heat exchange tube is continuously squeezed by the forming component 1 to become a D-shaped cross-section heat exchange tube. The D-shaped cross-section heat exchange tube is wound around the barrel wall of the barrel body 7 under the continued drive of the rotating component 2.

[0083] The number of the distance measuring sensors 112 of the molding component 1 is 2, and both are connected to the fixed frame 101 of the molding component 1 by bolts. The two distance measuring sensors 112 are located outside the D-shaped molding cavity, and the distance measuring ray direction thereof is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube; the distance measuring points of the two distance measuring sensors 112 are set on the plane of the D-shaped cross-section heat exchange tube, and the connecting line of the two distance measuring points is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube. When the D-shaped cross-section heat exchange tube is not twisted, the distance measuring values ​​of the two distance measuring sensors 112 are equal. When the D-shaped cross-section heat exchange tube is twisted around the moving direction, the distance measuring value of one of the distance measuring sensors 112 increases while the distance measuring value of the other decreases; the two distance measuring sensors 112 are both electrically connected to the control system, and can transmit the distance measuring information to the control system in real time;

[0084] The lifting assembly 3 includes a lifting frame 301, a guide rail 302 and a lifting drive motor 303. The guide rail 302 is fixed to the column 5 by bolts, and its installation direction is parallel to the column 5. The lifting frame 301 is equipped with a slider, so that the lifting frame 301 can be slidably connected with the guide rail 302. The lifting frame 301 is fixed to the fixed frame 101 of the forming assembly 1 by bolts, and is connected to the rotating shaft of the lifting drive motor 303 through a screw nut transmission structure, which can drive the forming assembly 1 to perform a lifting movement perpendicular to the moving direction of the D-shaped cross-section heat exchange tube; the lifting drive motor 303 is equipped with an encoder, both of which are electrically connected to the control system, and can transmit the height information of the lifting assembly 3 to the control system in real time; the rising movement of the lifting assembly 3 and the rotational movement of the rotating assembly 2 are synchronized and coordinated, and together drive the D-shaped cross-section heat exchange tube to be spirally wound on the barrel wall of the barrel body 7;

[0085] S2 determines the control relationship;

[0086] The determination of the control relationship includes determining the inherent rotational resistance torque, determining the relationship between the resistance of the heat exchange tube passing through the molding component 1 and the die pressure, and determining the relationship between the distance difference and the required die pressure. The radius R of the barrel 7 of the embodiment device is 0.164 meters, the rated power of the rotating component 2 is 1500W, and the normal speed ω 常 is 5.026rad / s, the conventional die pressure F 压常 It is 1600N.

[0087] S201 determines the inherent rotational resistance torque;

[0088] Determine the inherent rotational resistance torque M of the rotating component 2 固阻 The steps are:

[0089] a) Pull one end of the circular cross-section heat exchange tube out of the raw material tube tray, and directly fix the heat exchange tube on the barrel wall 7 by welding with a special buckle without passing through the forming component 1;

[0090] b) setting the driving motor of the rotating component 2 to a speed control mode in the control system;

[0091] c) Set the test speed ω of the rotating component 2 to 1.257rad / s, 2.513rad / s, 3.770rad / s, 5.026rad / s, 6.283rad / s, 7.54rad / s0, 8.796rad / s, and 10.053rad / s in the control system respectively. i , start the heat exchange tube winding process in sequence, and collect the operating power of the driving motor of the rotating component 2 at different speeds;

[0092] d) The average operating power of the driving motor of the rotating component 2 collected in the control system for each test is P i , i is 1 to 8, as shown in the following table:

[0093] i <![CDATA[P i ]]> 1 54.8 2 117.4 3 168.3 4 228.1 5 291.3 6 352.0 7 411.7 8 476.4

[0094] Substituting into the formula, we get

[0095] S202 determines the relationship between the die pressure of the molding component and the resistance of the heat exchange tube;

[0096] Determine the die pressure F of the molded component 1 压 And the resistance F of the heat exchange tube to the forming component 1 阻 The steps of the relationship are:

[0097] a) Pull one end of the circular cross-section heat exchange tube out from the raw material tube plate, pass it through the forming component 1 and fix the heat exchange tube at this end to the barrel wall of the barrel body 7,

[0098] b) in the control system, the driving motor of the rotating component 2 is set to a speed control mode, and the electric push rod cylinder 111 of the forming component 1 is set to a torque control mode;

[0099] c) In the control system, 1600N, 2000N, 2400N, 2800N, 3200N, 3600N, 4000N, 4400N, and 4800N are set in ascending order as the test die pressing pressure F output by the electric push rod cylinder 111. 压 , set 5.026rad / s as the test speed of rotating component 2, start the heat exchange tube winding process, and collect different die pressures F 压j The average operating power P of the driving motor of the rotating component 2 is j , where j is the test sequence number of this step, j = 1 to 9;

[0100] d) After each test, the collected average operating power P of the driving motor of the rotating component 2 is j The rated power P of the motor 额 =1500W, make the following judgment:

[0101] If P j Less than or equal to 1500W, the heat exchange tube in this test passes the resistance of molding component 1

[0102] F 阻j =(P j / ω 常 -M 固阻 ) / R; in the test, this judgment is met when j=1 to 7;

[0103] If P j Greater than P 额 , the speed of the rotating assembly 2 is continuously reduced during the test so that the actual operating power of the driving motor of the rotating assembly 2 in this test is stabilized at P 额 , the control system reads the average speed value ω of the rotating component 2 at this time j , then the heat exchange tube in this test passes through the resistance F of the molding component 1 阻j =(P 额 / ω j -M 固阻 ) / R; in the test, this judgment is met when j=8 to 9.

[0104] Record the test results as (F 压j , F 阻j ), as shown in the following table:

[0105] j <![CDATA[F 压j ]]> <![CDATA[F 阻j ]]> 1 1600 733 2 2000 878 3 2400 991 4 2800 1098 5 3200 1264 6 3600 1454 7 4000 1497 8 4400 1618 9 4800 1667

[0106] e) Use a second-degree polynomial fit (F 压j , F 阻j), we get F 阻 =f(F 压 ) and F 压 =f'(F 阻 )for:

[0107] F 阻 =f(F 压 )=26.1+0.473F 压 -2.63×10 -5 F 压 2

[0108] F 压 =f'(F 阻 )=251.70+1.34F 阻 +7.74×10 -4 F 阻 2

[0109] f) After the test, check and analyze the appearance and cross-sectional shape of the D-shaped tube formed by each die pressure. According to the product performance requirements, determine the maximum die pressure in the test to be suitable for the D-shaped tube barrel winding process. Set the maximum die pressure F 压max Set to 4800N.

[0110] S203 determines the relationship between the distance measurement difference and the required die pressing pressure;

[0111] The steps for determining the relationship between the distance difference of the distance sensor 112 and the die pressure required to overcome the distortion of the corresponding D-shaped cross-section heat exchange tube are:

[0112] a) Test preparation: pull one end of the circular cross-section heat exchange tube from the raw material tube plate, pass it through the molding component 1 and fix the end of the heat exchange tube to the barrel wall of the barrel body 7; set the driving motor of the rotating component 2 to the speed control mode in the control system, and set the electric push rod cylinder 111 of the molding component 1 to the torque control mode; set 21 pressure values ​​from 1600N to 4800N in increments of 160N from the smallest to the largest as the output die pressure F of the electric push rod cylinder 111 for the test 压m , where m is the test sequence number of this step, m=1 to 21; in each test, the speed setting of the rotating component 2 follows the following judgment logic:

[0113] Judgment threshold F 压阈 =f'(F 阻阈 )=f'[(P 额 / ω 常 -M 固阻 ) / R]=4150N,

[0114] When F 压m When the test speed of the rotating component 2 is less than or equal to 4150N, ωm Set to ω m =ω 常 =5.026rad / s, this judgment is met when m is 1 to 16;

[0115] When F 压m When it is greater than 4150N, the test speed ω of the rotating component 2 m Set to When m is between 17 and 21, this judgment is met, and ω is calculated. 17 To 21 They are 5.024rad / s, 4.921rad / s, 4.821rad / s, 4.728rad / s and 4.641rad / s respectively.

[0116] b) Data acquisition: the control system records the distance values ​​l1 and l2 of the distance sensor 112 and the pressure value F of the electric push rod cylinder 111 received at the same time during the test according to the sampling period t. 压 , the rotation position value θ of the rotating component 2 and the height value h of the lifting component 3, and the data recording date and time are attached to form a storage data d 采mn =(l 1mn , l 2mn , F 压mn ,θ mn ,h mn , T mn ) represents the data collected for the nth time in the mth test, where θ is the relative angle between the connection point between the starting end of the D-shaped heat exchange tube and the barrel 7 at the data sampling time and the winding start time of the rotating component 2; the test data d 采mn Save to data table {d 采m}, m = 1 to 21;

[0117] The data sampling period t is selected to be less than or equal to 50% of the time required for the D-shaped cross-section heat exchange tube to move a distance equal to the width of the D-shaped tube forming plane, so that the collected data can include the information of the twisting of the D-shaped tube whose twisting length is as short as the width of the D-shaped tube; the sampling period Where d is the plane width of the D-shaped tube, in meters;

[0118] The data collection time for each test is until the final inspection process finds 4 products with poor heat exchange tube wall adhesion. After the test is stopped, the barrel that has completed the heat exchange tube winding process will continue to be processed to the final inspection process, and the additional poor wall adhesion products found in the final inspection process will be included in the test results;

[0119] c) Data preprocessing, all data tables {d 采m} data l1 and l2 are converted into the absolute value of the distance difference |Δl|, and θ mn Transformed into θ' mn =θ mn+L / R, where L is the distance between the tangent point of the D-shaped heat exchange tube and the barrel and the distance measurement point, L = 0.233 meters, R is the radius of the barrel, R = 0.164 meters, θ' mn =θ mn +L / R=θ mn +1.402, get data d 存mn =(|Δl mn |, F 压mn ,θ' mn ,h mn , T mn ) and its constituent data tables {d 存m}, m = 1 to 21;

[0120] For each table {d 存m The |Δl| values ​​of the data are checked by K-Means anomaly, and the data identified as outliers by |Δl| are archived as a new data table {d 待m}, m = 1 to 21;

[0121] d) Data analysis: Compare each group of poorly adhered products with the data {d 待m}θ' mn ,h mn , T mn and |Δl mn | value comparison, according to the processing time and location of poorly adhered products, determine {d 待m The data related to poor adhesion in the 不良m and the dataset {d 不良m}, m = 1 to 21;

[0122] All data tables {d 不良m The |Δl| values ​​of the data are listed in ascending order and duplicate values ​​are removed to form a queue {|Δl k |}, k = 1 to x, where x is the queue {|Δl k |} the number of data; {|Δl k |} each |Δl k | The value is cycled in turn with each data table from small to large {d 不良m} Make a comparison and make a judgment:

[0123] If a {d 不良m}There is a certain data |Δl mn |Value is less than or equal to |Δl k |, then stop |Δl k |with{d 不良m}, and start the comparison of |Δl k |With the next data set {d 不良m+1} comparison;

[0124] If a {d 不良m} of all data in |Δl mn |values ​​are all greater than |Δl k |, then stop |Δl k | and put this data table {d 不良m F in 压 With |Δl k | is recorded as a piece of data (|Δl k |, F 压k ), and record 1 successful search, and then start the next |Δl k+1 |Comparison;

[0125] Until a certain |Δl k |With all datasets {d 不良m}Comparison without any data set full |Δl mn |are both greater than |Δl k |, the loop comparison ends.

[0126] Get a set of data (|Δl k |, F 压k ) are as follows: The details are as follows:

[0127] k <![CDATA[|Δl k |]]> <![CDATA[F 压k ]]> 1 1.44 1920 2 1.74 2240 3 1.96 2560 4 2.16 2880 5 2.27 3040 6 2.31 3200 7 2.44 3360 8 2.50 3520 9 2.61 3680 10 2.72 4000 11 2.90 4480 12 2.94 4640 13 3.02 4800

[0128] Using the exponential function y=ab x Fitting above (|Δl k |, F 压k ) data, namely F 压 =g(|Δl|)=ab |Δl| , we get the adjustment coefficients a = 789.4, b = 1.817, that is, (|Δl k |, F 压k ) is:

[0129] The effective range is 0<F 压 ≤4800N

[0130] Where |Δl| represents the degree of distortion of a certain section of the D-shaped tube (the D-shaped cross section causes the ranging sensor to produce a ranging error of |Δl x | deflection), F 压 Indicates the die pressure that causes the rotating component to generate the required torque in the speed control mode (the required torque is the magnitude of the rotating component when the winding twist degree is |Δl x |D-shaped tube).

[0131] S3 sets the control logic;

[0132] In the control system, the driving motor of the rotating component 2 is set to the speed control mode, the driving motor of the moving part 102 of the molding component 1 is set to the force control mode, and the initial die pressure of the production process is set to F 压0 =1600N, initial speed is ω0=5.026rad / s;

[0133] The control system is preset with the calculation logic obtained in step S203 Valid range: 0<F 压 ≤4800N, the control system collects the distance difference value |Δl in real time based on the distance measuring sensor 112 t |, continuously calculate the corresponding required die pressure value F 压t (t is the real-time acquisition sequence number), and F 压t and the initial die pressure value F 压0 =1600N comparison, execute the following first judgment logic:

[0134] When F 压t Less than or equal to F 压0 When the control system determines that the current D-shaped tube distortion will not cause poor wall adhesion, the control system maintains the current state and continues to operate;

[0135] When F 压t Greater than F 压0 When the control system determines that the current D-shaped tube distortion may cause poor wall adhesion, the die pressure will be increased to increase the resistance of the molding component 1 to the passage of the heat exchange tube, thereby increasing the rotational resistance torque of the rotating component 2; the driving motor of the rotating component 2 will automatically increase the motor driving torque to balance the rotational resistance torque (so that the motor running speed is maintained at the set speed) in the speed control mode of the control system, thereby increasing the ability to overcome the distortion of the D-shaped tube;

[0136] After completing the first judgment logic, the control system will set F 压t The preset die pressure threshold F 压阈 For comparison:

[0137] When F 压t Less than or equal to F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly 2 does not exceed its rated power P after the die pressure increases, 额 , the control system does not execute the power limiting logic, that is, only the die pressure is adjusted this time;

[0138] When F 压t Greater than F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly 2 will exceed its rated power P after the die pressure increases, 额, the control system will execute the power limiting logic, that is, the die pressure is increased and the speed of the rotating component 2 is reduced to The die pressure threshold

[0139] F 压阈 =f'[(P 额 / ω0-M 固阻 ) / R]=4150.6N.

[0140] After completing the second judgment logic, the control system will 压t and maximum die pressure F 压max =4800N comparison, execute the following third judgment logic:

[0141] When F 压t Less than or equal to F 压max When the control system uses F 压t The output value of the current die pressure adjustment value;

[0142] When F 压t Greater than F 压max When the control system uses F 压max It is the output value of the current die pressure adjustment value, and marks the barrel currently being produced after the die pressure increase is completed, so that it can enter the subsequent wall adhesion full inspection process;

[0143] Each increase in die pressure is maintained until the deflection of the D-shaped tube |Δl triggers the increase in die pressure. t | is wound around the barrel body at 1.5 turns. After completion, the die pressure is restored to the initial value F 压0 ;

[0144] S4 production execution;

[0145] One end of the heat exchange tube is pulled out from the incoming tube coil, passes through the forming assembly 1 and the D-shaped tube formed at the end is fixed on the barrel wall of the barrel body 7, and the device for preventing the D-shaped tube from poorly adhering to the wall is operated. The device for preventing the D-shaped tube from poorly adhering to the wall completes the production process of winding the D-shaped tube around the barrel body 7 according to the control logic set in step S3 of the method.

[0146] The wall adhesion defect rate recorded by the continuous operation of the intelligent barrel winding device of the embodiment is 0.5‰, which is greatly reduced compared with 4‰ of the prior art, ensuring that the D-shaped cross-section heat exchange tube is tightly wound on the barrel body, greatly reducing the quality inspection and rework costs of the freeze dryer manufacturing process, and also promoting the further application of the D-shaped cross-section heat exchange tube.

[0147] It should be understood that the above embodiment is only one embodiment of the present invention, and there are many other embodiments and variations thereof based on the present invention; the variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations all fall within the protection scope of the present invention.

Claims

1. A freeze dryer D-shaped heat exchange tube barrel wall optimization method, characterized in that: The following steps are involved: S1 assembles the intelligent barrel winding device; The intelligent barrel winding device includes a forming component, a rotating component, a lifting component and a control system; The molding assembly includes a fixed frame, a moving part slidably connected to the fixed frame, a die wheel and a distance sensor connected to the fixed frame, and a die wheel connected to the moving part, wherein the die wheel is used to accommodate a heat exchanger, and the moving part can drive the die wheel to approach or move away from the die wheel. When the die wheel approaches the die wheel, the die wheel and the die wheel enclose a D-shaped molding cavity, the height of the D-shaped molding cavity gradually decreases from one end to the other end along the length direction, and the die wheel can squeeze the heat exchanger located in the D-shaped molding cavity; the moving part is driven by an electric push rod cylinder, the cylinder body of the electric push rod cylinder is fixedly connected to the fixed frame, the extending shaft of the electric push rod cylinder is fixedly connected to the moving part, and the electric push rod cylinder is equipped with a pressure sensor, both of which are electrically connected to the control system to transmit the pressure information of the electric push rod cylinder to the control system in real time; The rotating assembly is equipped with a barrel of a freeze dryer, which can drive the barrel to rotate around the axis of its own cylinder. A barrel wall of the barrel is connected to one end of the heat exchange tube. When the rotating assembly rotates, the heat exchange tube is driven to move from the end with a larger height of the D-shaped cavity to the other end, so that the circular cross-section heat exchange tube is extruded by the molding assembly to become a D-shaped cross-section heat exchange tube. The D-shaped cross-section heat exchange tube is wound around the barrel wall of the barrel under the continuous drive of the rotating assembly. The rotating assembly is driven by a motor equipped with an encoder. The motor and its encoder are both electrically connected to the control system, and the rotation position and speed information of the rotating assembly are transmitted to the control system in real time. There are two distance measuring sensors, all of which are installed on the fixed frame. The two distance measuring sensors are located outside the D-shaped cavity, and the distance measuring ray direction is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube; the distance measuring points of the two distance measuring sensors are set on the plane of the D-shaped cross-section heat exchange tube, and the connecting line of the two distance measuring points is perpendicular to the moving direction of the D-shaped cross-section heat exchange tube. When the D-shaped cross-section heat exchange tube is not twisted, the distance measuring values ​​of the two distance measuring sensors are equal. When the D-shaped cross-section heat exchange tube is twisted around the moving direction, the distance measuring value of one of the distance measuring sensors increases while the other decreases; the two distance measuring sensors are electrically connected to the control system to transmit the distance measuring information to the control system in real time; The lifting assembly can drive the molding assembly as a whole to perform lifting motion perpendicular to the moving direction of the D-shaped cross-section heat exchange tube, and together with the rotating assembly, drives the D-shaped cross-section heat exchange tube to be spirally wound on the barrel wall of the barrel body; the lifting assembly is driven by a motor equipped with an encoder, and the drive motor and its encoder are both electrically connected to the control system, and the height information of the lifting assembly can be transmitted to the control system in real time; S2 determines the control relationship; Determination of the control relationship includes determining the inherent rotational resistance torque, determining the relationship between the resistance of the heat exchange tube passing through the molding component and the die pressure, and determining the relationship between the distance measurement difference and the required die pressure; S201 determines the inherent rotational resistance torque; Determine the inherent rotational resistance torque M of the rotating component 固阻 The steps are: a) pulling one end of the circular cross-section heat exchange tube out of the raw material tube tray, and directly fixing the heat exchange tube at this end to the barrel wall without passing through the forming assembly; b) setting the driving motor of the rotating assembly to a speed control mode in the control system; c) about the normal speed ω of the rotating component 常 Select several speeds with the same intervals in the upper and lower ranges as the test speeds, start the heat exchange tube winding process, and collect the average operating power of the driving motor of the rotating component at different speeds, ω 常 It is the conventional production speed set for mass production of the D-shaped cross-section heat exchange tube winding device which does not have the wall-adhering optimization function under the existing technology; d) Using the control system to collect the average operating power P of the driving motor of the rotating assembly during each test i ,calculate Where i is the test order, P i The unit is W, ω i The unit is rad / s, M 固阻 The unit is Nm; S202 determines the relationship between the die pressure of the molding component and the resistance of the heat exchange tube; Determine the die pressure F of the molded component 压 and the resistance F of the molded component to the passage of the heat exchange tube 阻 The steps of the relationship are: a) pulling one end of the circular cross-section heat exchange tube out from the raw material tube tray, passing through the forming assembly and fixing the heat exchange tube at this end on the barrel wall, b) in the control system, setting the driving motor of the rotating component to a speed control mode and setting the electric push rod cylinder of the forming component to a torque control mode; c) A conventional compression molding pressure F selected from the molding assembly 压常 The pressure values ​​which increase gradually and are equally spaced are used as the test die pressure, and are set in the control system in order from small to large as the output pressure of the electric push rod cylinder of the molding component, and the normal speed ω of the rotating component is set. 常 Set the test speed, start the heat exchange tube winding process, and collect different die pressures F 压j The average operating power P of the driving motor of the rotating assembly is j , where j is the test number, and the conventional die pressure F 压常 The die pressure during mass production of a D-shaped cross-section heat exchange tube winding device that does not have the wall-adhering optimization function under the prior art; d) After each test, the average operating power P of the driving motor of the rotating component collected is j Compared with the rated power of the motor P 额 , make the following judgment: If P j Less than or equal to P 额 , then the resistance F of the heat exchange tube in this test passing through the molding assembly 阻j =(P j / ω 常 -M 固阻 ) / R; If P j Greater than P 额 , the rotation speed of the rotating assembly is continuously reduced during the test so that the actual operating power of the rotating assembly driving motor of the test is stabilized at P 额 , the control system reads the average speed value ω of the rotating component at this time j , then the resistance F of the heat exchange tube in this test passing through the molding assembly 阻j =(P 额 / ω j -M 固阻 ) / R; The above R is the radius of the barrel, in m; the test result is recorded as (F 压j , F 阻j ); e) Using polynomial fitting (F 压j , F 阻j ), we get F 阻 =f(F 压 ) and F 压 =f'(F 阻 )express; f) After the test, inspect and analyze the appearance and cross-sectional shape of the D-shaped tube formed by each die pressure, and determine the maximum die pressure F suitable for D-shaped tube barrel winding according to product performance requirements. 压max ; S203 determines the relationship between the distance measurement difference and the required die pressing pressure; The steps to determine the relationship between the distance measurement difference and the required die pressure are: a) Test preparation: pull one end of the circular cross-section heat exchange tube out from the raw material tube plate, pass it through the molding assembly and fix the end of the heat exchange tube on the barrel wall; set the driving motor of the rotating assembly to speed control mode in the control system and set the electric push rod cylinder of the molding assembly to torque control mode; select the conventional die pressure F of the molding assembly 压常 The pressure values ​​that start to increase gradually and are equally spaced are used as the test die pressure values, and are set in the control system in order from small to large as the output pressure F of the electric push rod cylinder. 压m , where m is the test sequence number of this step; in each test, the speed setting of the rotating component follows the following judgment logic: When F 压m Less than or equal to F 压阈 When the test speed of the rotating component is ω m Set to ω m =ω 常 ; When F 压m Greater than F 压阈 When the test speed of the rotating component is ω m Set to where F 压阈 =f'[P 额 / ω 常 -M 固阻 ) / R],F 压 =f'(F 阻 ) is the quantitative relationship between the die pressure of the molding assembly and the resistance of the heat exchange tube passing through the molding assembly obtained in step S202 of the method; b) Data acquisition: The control system records the distance values ​​l1 and l2 of the distance measuring sensor and the pressure value F of the electric push rod cylinder received at the same time during the test according to the sampling period t. 压 , the rotation position value θ of the rotating component and the height value h of the lifting component, and attach the data recording date and time to form a collection data information d 采mn =(l 1mn , l 2mn , F 压mn ,θ mn ,h mn , T mn ), represents the data collected at the nth time of the mth test; d 采mn Derive and convert l1 and l2 into the absolute value of the distance difference |Δl| to form d 存mn =(Δl mn |, F 压mn ,θ mn ,h mn , T mn ); c) Data preprocessing, all data tables {d 采m } data l1 and l2 are converted into the absolute value of the distance difference |Δl|, and θ mn Transformed into θ' mn =θ mn + L / R, where L is the distance between the tangent point of the D-shaped cross-section heat exchange tube and the barrel and the distance measurement point, and R is the radius of the barrel, and the data d is obtained. 存mn =(|Δl mn |, F 压mn ,θ' mn ,h mn , T mn ) and its constituent data tables {d 存m }, m is the test sequence number; For each table {d 存m The |Δl| values ​​of the data are checked by K-Means anomaly, and the data identified as outliers by |Δl| are archived as a new data table {d 待m }, m is the test sequence number; d) Data analysis: Compare each group of poorly adhered products with the data {d 待m }θ' mn ,h mn , T mn and |Δl mn | value comparison, according to the processing time and location of poorly adhered products, determine {d 待m The data related to poor adhesion in the 不良m and dataset {d 不良m }, m is the test sequence number; All data tables {d 不良m The |Δl| values ​​of the data are listed in ascending order and duplicate values ​​are removed to form a queue {|Δl k |}, k = 1 to x, where x is the queue {|Δl k |} the number of data; {|Δl k |} each |Δl k | The value is cycled in turn with each data table from small to large {d 不良m } Make a comparison and make a judgment: If a {d 不良m }There is a certain data |Δl mn |Value is less than or equal to |Δl k |, then stop |Δl k |with{d 不良m }, and start the comparison of |Δl k |With the next data set {d 不良m+1 } comparison; If a {d 不良m } of all data in |Δl mn |values ​​are all greater than |Δl k |, then stop |Δl k | and put this data table {d 不良m F in 压 With |Δl k | is recorded as a piece of data (|Δl k |, F 压k ), and record 1 successful search, and then start the next |Δl k+1 |Comparison; Until a certain |Δl k |With all datasets {d 不良m }Comparison without any data set full |Δl mn |are both greater than |Δl k |, the loop comparison ends; Get a set of data (|Δl k |, F 压k ), k is the comparison success sequence number; Using the exponential function y=ab x Fitting data set (|Δl k |, F 压k ), and get the specific F 压 =g(|Δl|)=ab |Δl| , where a and b are adjustment coefficients, and the relation |Δl| represents the degree of distortion of a certain section of the D-shaped tube (the D-shaped cross section produces a distance difference of |Δl for the distance sensor x | deflection), F 压 Indicates the die pressure that causes the rotating component to generate the required torque in the speed control mode (the required torque is the magnitude of the rotating component when the winding twist degree is |Δl x |D-shaped tube); S3 sets the control logic; In the control system, the driving motor of the rotating component is set to the speed control mode, the driving motor of the moving part of the molding component is set to the torque control mode, and the initial die pressure of the production process is set to F 压0 =F 压常 、The initial speed is ω0=ω 常 ; The control system is preset with the calculation logic F obtained in step S203 压 =g(|Δl|)=ab |Δl| , effective range 0 <F 压 <F 压max The control system is based on the distance difference value |Δl collected in real time by the ranging sensor t |, continuously calculate the corresponding required die pressure value F 压t , t is the real-time collection sequence number, and F 压t and the initial die pressure value F 压0 Compare and execute the following first judgment logic: When F 压t Less than or equal to F 压0 When the control system determines that the current D-shaped tube distortion will not cause poor wall adhesion, the control system maintains the current state and continues to operate; When F 压t Greater than F 压0 When the control system determines that the current D-shaped tube distortion may cause poor wall adhesion, the die pressure will be increased to increase the resistance of the molding assembly to the passage of the heat exchange tube, thereby increasing the rotational resistance torque of the rotating assembly; the driving motor of the rotating assembly will automatically increase the motor driving torque in the speed control mode of the control system to balance the current rotational resistance torque so that the motor running speed is maintained at the set speed, thereby increasing the ability to overcome the distortion of the D-shaped tube; After completing the first judgment logic, the control system will set F 压t The preset die pressure threshold F 压阈 For comparison: When F 压t Less than or equal to F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly does not exceed its rated power P after the die pressure increases, 额 , the control system does not execute the power limiting logic, that is, only the die pressure is adjusted this time; When F 压t Greater than F 压阈 When the control system determines that the output power of the driving motor of the rotating assembly will exceed its rated power P after the die pressure increases, 额 , the control system will execute the power limiting logic, that is, the die pressure is increased and the speed of the rotating component is reduced to The die pressure threshold F 压阈 =f'[(P 额 / ω0-M 固阻 ) / R]; After completing the second judgment logic, the control system will 压t and maximum die pressure F 压max Compare and execute the following third judgment logic: When F 压t Less than or equal to F 压max When the control system uses F 压t The output value of the current die pressure adjustment value; When F 压t Greater than F 压max When the control system uses F 压max It is the output value of the current die pressure adjustment value, and marks the barrel currently being produced after the die pressure increase is completed, so that it can enter the subsequent wall adhesion full inspection process; Each increase in die pressure is maintained until the deflection of the D-shaped tube |Δl triggers the increase in die pressure. t | is wound around the barrel until the length is sufficient, and after completion, the die pressure returns to the initial value F 压0 ; S4 production execution; One end of the heat exchange tube is pulled out from the incoming tube disc, passes through the molding assembly and fixes the D-shaped tube formed at the end on the barrel wall of the barrel body, and the intelligent barrel winding device is operated. The intelligent barrel winding device completes the production process of winding the D-shaped tube around the barrel body according to the control logic set in step S3 of this method.

2. The method for optimizing the D-shaped heat exchange tube of a freeze dryer around the barrel wall according to claim 1, characterized in that: The polynomial degree of the polynomial fitting performed in step S202 is less than or equal to 3.

3. The method for optimizing the D-shaped heat exchange tube of a freeze dryer around the barrel wall according to claim 1, characterized in that: The data sampling period t of step S203 is selected to be less than or equal to 50% of the time required for the D-shaped cross-section heat exchange tube to move a distance equal to the width of the D-shaped tube forming plane.

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