Production process of thermal insulation shell of film machine stretcher

Abstract

The invention relates to the technical field of thermal insulation shell production, and particularly discloses a production process of a thermal insulation shell of a film machine stretcher, which comprises the following steps of: determining the boundary dimension of the thermal insulation shell according to a drawing of the stretcher, drawing, and selecting polyurethane foam as a thermal insulation material. And cutting a thin steel plate as a panel and fixing, installing a foam plate in the shell and fixing and sealing with glue, and finally carrying out paint spraying treatment. The method further comprises the steps that gaps between the foam board and the inner wall of the shell are measured in a partitioned mode, the gap super-boundary coefficient is calculated, the bonding strength of super-boundary blocks is tested, and the bonding process abnormal coefficient is calculated. And for the unqualified condition, the product of the glue dosage and the curing time is processed to obtain a glue influence coefficient, a scatter diagram is drawn, a better glue influence coefficient is obtained through calculation, and the glue amount and the curing time of the bonding process are adjusted according to the better glue influence coefficient, so that the product quality and the process stability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of heat-insulating shell production, and in particular to a production process of a heat-insulating shell of a film stretching machine. Background Art

[0002] In the operation of the film stretching machine, the insulation shell plays a vital role. On the one hand, it can effectively reduce the loss or absorption of heat and maintain a stable working temperature inside the stretching machine. On the other hand, a good insulation shell helps to improve the working environment and reduce the impact of heat dissipation on the surrounding environment and operators. In the existing insulation shell production process, the insulation shell design does not fully consider the actual working conditions of the stretching machine, resulting in poor insulation effect.

[0003] A Chinese patent application with the publication number CN114348468A discloses a modular water tank stainless steel shell insulation board and its production process, comprising: (1) taking a stainless steel shell board of a certain size, placing the stainless steel shell board on a hydraulic mold according to the size requirements to press out the modular stainless steel water tank shell board pattern and fold four folded edges inward on all sides, and then using an angular flame retardant exhaust device to fix and connect adjacent folded edges together to form a stable outer frame; (2) welding the connecting piece of the flame retardant exhaust device to the inner side wall of the folded edge of the modular stainless steel water tank shell board, and at least three flame retardant exhaust devices are welded to the inner side wall of each folded edge; (3) placing the modular stainless steel water tank shell board on a foaming mold device, and then inserting an inner insulation layer thickness positioning code support gasket into the concave groove of the flame retardant device, and then injecting foam insulation material into the cavity surrounded by the folded edges of the modular stainless steel water tank shell board. After the injection is completed, the pneumatic cylinder or hydraulic cylinder of the device is started to allow the foam insulation material to foam and form in the foaming mold.

[0004] In the above-mentioned technologies, there is a lack of effective quality inspection and optimization methods for the bonding process of the outer shell. Improper use of glue leads to insufficient bonding strength, affecting the structural strength of the outer shell. These problems restrict the performance improvement of the thermal insulation outer shell of the stretching machine of the film machine. A scientific inspection method is needed to solve the above problems in order to meet the quality requirements for the thermal insulation outer shell of the stretching machine of the film machine in industrial production.

[0005] To this end, the present invention provides a production process for a thermal insulation shell of a film stretching machine. Summary of the invention

[0006] The object of the present invention is to provide a production process for a thermal insulation shell of a film stretching machine to solve the above-mentioned background problems.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A production process for a thermal insulation shell of a film machine stretching machine comprises the following steps: in the process of fixing a polyurethane foam board to the shell with glue, dynamically identifying the amount of glue and the curing time of the foam board in the bonding process;

[0009] The foam board is divided into a plurality of measurement blocks, and the gap between the foam board and the inner wall of the shell of each measurement block is measured with a feeler gauge to obtain a block gap value, and the block gap value is compared with the block gap threshold, and the block gap value greater than the block gap threshold is marked as a gap out-of-bounds block, and the total number of gap out-of-bounds blocks is processed by ratio processing to the total number of blocks to obtain a gap out-of-bounds block ratio Qk, and the mean value of the block gap difference is processed by ratio processing to the block gap threshold to obtain a block gap difference ratio Jc, and the gap out-of-bounds coefficient Jx is calculated based on the gap out-of-bounds block ratio Qk and the block gap difference Jc, and the gap out-of-bounds coefficient Jx ≥ the gap out-of-bounds threshold Jxz, and an out-of-bounds analysis signal is generated;

[0010] Based on the over-boundary analysis signal, a universal testing machine is used to test the bonding strength of the foam board and the shell bonding sample to obtain the bonding strength, and the bonding strength is marked as a weak bonding block with a bonding strength lower than the bonding strength threshold. The weak bonding strength mean difference of all weak bonding blocks is calculated and compared with the bonding strength threshold to obtain the weak bonding strength difference ratio Rn. The total number of overlapping blocks marked as weak bonding blocks and gap over-boundary blocks is obtained, and the total number of overlapping blocks is compared with the total number of measured blocks to obtain the overlapping block number ratio Ch. The gap over-boundary coefficient and the gap over-boundary threshold are calculated to obtain the gap over-boundary difference, which is then compared with the gap over-boundary threshold to obtain the gap over-boundary ratio Cj. The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch and the gap over-boundary ratio Cj. If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold Ycz, an unqualified analysis signal is generated;

[0011] Based on the unqualified analysis signal, the product of glue amount and curing time is used as the glue influence coefficient. A scatter plot is drawn with the glue influence coefficient as the X-axis and the bonding process abnormality coefficient as the Y-axis, and an abnormal reference line is drawn with the bonding process abnormality coefficient threshold. The numerical points below the abnormal reference line in the scatter plot are obtained, and the X-axis is divided into multiple sections as target sections. The coordinates of the midpoint of the target section are calculated and the nearest numerical point is obtained. A numerical circle is drawn with the numerical point as the center and the length of the target section as the diameter. The bonding process abnormality coefficients of the numerical points in the numerical circle are summed and averaged to obtain the mean of the bonding process abnormality coefficients in the circle. The X-axis coordinate corresponding to the minimum mean value of the abnormality coefficient in the circle is selected as the optimal glue influence coefficient. The glue amount and glue curing time of the bonding process are adjusted based on the optimal glue influence coefficient.

[0012] As a further technical solution of the present invention: the gap over-limit coefficient Jx is obtained as follows:

[0013] Calculate the gap over-bound coefficient Jx based on the gap over-bound block ratio Qk and the block gap difference ratio Jc;

[0014] By formula: The gap over-limit coefficient Jx is calculated, where a1 and a2 are preset proportional coefficients;

[0015] The acquisition method of the super-boundary analysis signal is:

[0016] Compare the gap over-bound coefficient Jx with the gap over-bound threshold Jxz;

[0017] If the gap over-boundary coefficient Jx ≥ the gap over-boundary threshold Jxz, it indicates that the gap of the foam board is too large, and an over-boundary analysis signal is generated;

[0018] If the gap over-limit coefficient Jx is less than the gap over-limit threshold Jxz, it indicates that the gap of the foam board is within the normal range, and it is still necessary to continue to detect the change of the gap over-limit coefficient Jx.

[0019] As a further technical solution of the present invention: the gap over-boundary block ratio Qk is obtained by dividing the foam board into a plurality of blocks, and marking each block as a measurement block;

[0020] Use a feeler gauge to measure the gap between the foam board of each measuring block and the inner wall of the shell to obtain the block gap value;

[0021] Compare the block gap value with the block gap threshold;

[0022] If the block gap value is greater than the block gap threshold, the measurement block whose block gap value is greater than the block gap threshold is marked as a gap out-of-bounds block;

[0023] Get the number of all gap out-of-bounds blocks to get the total number of gap out-of-bounds blocks;

[0024] The total number of gap-out-of-bounds blocks is processed by ratio with the total number of blocks to obtain the gap-out-of-bounds block ratio, and the gap-out-of-bounds block ratio is marked as Qk;

[0025] The block gap difference ratio Jc is obtained as follows:

[0026] Calculate the difference between the block gap value of each gap-out-of-bounds block and the block gap threshold to obtain the block gap difference;

[0027] Calculate the block gap differences of all the blocks with gaps exceeding the boundary to obtain the total value of the block gap differences;

[0028] The total value of the block gap difference is processed by ratio with the total number of blocks with gaps exceeding the boundary to obtain the mean value of the block gap difference;

[0029] The block gap difference mean is ratioed to the block gap threshold to obtain the block gap difference ratio, which is marked as Jc.

[0030] As a further technical solution of the present invention: the bonding process abnormality coefficient Yc is obtained as follows:

[0031] The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch, and the gap over-limit ratio Cj;

[0032] By formula: Among them, b1, b2, and b3 are preset proportional coefficients;

[0033] The unqualified analysis signal is generated in the following manner:

[0034] Compare the bonding process abnormality coefficient Yc with the bonding process abnormality coefficient threshold value Ycz;

[0035] If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell is unqualified, and an unqualified analysis signal is generated;

[0036] If the bonding process abnormality coefficient Yc is less than the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell meets the expected production requirements, but it is still necessary to continuously monitor the changes in the bonding process abnormality coefficient Yc.

[0037] As a further technical solution of the present invention: the weak bonding strength difference ratio Rn is obtained as follows:

[0038] Obtaining the bonding strength of each measurement block, and if the bonding strength is lower than a bonding strength threshold, marking the measurement block as a weak bonding block;

[0039] Obtain the bonding strength of all weak bonding blocks to obtain the total value of weak bonding strength;

[0040] Obtain the number of all weakly bonded blocks to obtain the total number of weakly bonded blocks;

[0041] The total value of weak bond strength is ratioed with the total number of weak bond blocks to obtain the mean value of weak bond strength;

[0042] The difference between the mean value of weak bond strength and the bond strength threshold is taken and the absolute value is taken to obtain the weak bond strength difference;

[0043] The ratio of the weak bonding strength difference to the bonding strength threshold is calculated to obtain the weak bonding strength difference ratio, which is marked as Rn.

[0044] As a further technical solution of the present invention: the bonding strength is obtained by:

[0045] For each measurement block, a universal testing machine was used to measure the bonding strength of the glue filled between the foam board and the inner wall of the shell;

[0046] The specific glue bonding strength measurement is as follows:

[0047] SS1. Prepare samples of each measuring block, where the foam board is bonded to the shell material, and install the samples on the fixture of the universal testing machine, with the bonding part at the center of the fixture to maintain uniform force;

[0048] SS2. Adjust the distance between the fixtures so that the sample will not be disturbed by additional forces during the test. Set the test parameters of the universal testing machine, set the universal testing machine to tensile mode, and the loading speed is 5 mm / min.

[0049] SS3. Start the universal testing machine and gradually increase the tensile force on the sample according to the set parameters. When the bonding part of the foam board is damaged, record the maximum tensile force value at the time of damage and mark the maximum tensile force value as the destructive force.

[0050] The bonding area of ​​a single measurement block is obtained, and the destructive force is ratioed to the bonding area to obtain the bonding strength.

[0051] As a further technical solution of the present invention: the method for obtaining the overlapping block number ratio Ch is as follows:

[0052] Obtain blocks that are marked as weakly bonded blocks and gap out-of-bounds blocks at the same time, and obtain overlapping blocks;

[0053] Get the number of overlapping blocks and calculate the total number of overlapping blocks;

[0054] The total number of overlapping blocks is processed by ratio with all measured blocks to obtain the overlapping block number ratio, which is marked as Ch;

[0055] The gap over-limit ratio Cj is obtained as follows:

[0056] Calculate the difference between the gap over-bound coefficient Jx and the gap over-bound threshold Jxz to obtain the gap over-bound difference;

[0057] The gap out-of-bounds difference is ratioed with the gap out-of-bounds threshold Jxz to obtain the gap out-of-bounds ratio, and the gap out-of-bounds ratio is marked as Cj.

[0058] As a further technical solution of the present invention: the method for obtaining the better glue influence coefficient is:

[0059] Obtain the mean of the intra-circle abnormal coefficients of all value circles, and put the mean of the intra-circle abnormal coefficients of all value circles into the abnormal coefficient set L as an element;

[0060] Arrange the elements in the abnormal coefficient set L in ascending order;

[0061] Select the element with the smallest value, that is, the mean of the anomaly coefficient within the smallest circle;

[0062] The X-axis coordinate corresponding to the mean value of the abnormal coefficient in the minimum circle is obtained, and the glue influence coefficient value of the obtained X-axis coordinate is marked as the better glue influence coefficient.

[0063] As a further technical solution of the present invention: the method for obtaining the value circle is:

[0064] Obtain the numerical points on the scatter plot of glue influence coefficient-bonding process abnormality coefficient that are lower than the abnormal reference line;

[0065] Divide the X-axis where the glue influence coefficient is located into multiple sections, and mark the sections as target sections;

[0066] Calculate the coordinates of the midpoint of the target segment, and obtain the nearest numerical point with the midpoint of the target block to obtain the nearest numerical point;

[0067] Draw a numerical circle with the nearest numerical point as the center and the target segment length as the diameter;

[0068] Obtain the bonding process abnormality coefficient value of the numerical point in the numerical circle, calculate the sum of the bonding process abnormality coefficients of all the numerical points in the numerical circle, and obtain the sum of the abnormality coefficients in the circle;

[0069] The sum of the anomaly coefficients within the circle is ratioed with the number of numerical points within the numerical circle to obtain the mean of the anomaly coefficients within the circle.

[0070] As a further technical solution of the present invention: the scatter plot of the glue influence coefficient-bonding process abnormality coefficient is obtained in the following manner:

[0071] Obtain the glue amount and glue curing time of the overlapping blocks, multiply the glue amount and the glue curing time to obtain the glue influence coefficient;

[0072] Obtain the bonding process abnormality coefficient Yc under different glue influence coefficients;

[0073] In a two-dimensional rectangular coordinate system, the glue influence coefficient is taken as the X-axis and the bonding process abnormality coefficient is taken as the Y-axis, and a scatter plot of the glue influence coefficient-bonding process abnormality coefficient is drawn;

[0074] The abnormal coefficient threshold value Ycz of the bonding process is used as the abnormal reference value, and the abnormal reference line is drawn in the two-dimensional rectangular coordinate system based on the abnormal reference value.

[0075] Beneficial effects of the present invention:

[0076] (1) The structure of a detachable thermal insulation shell is adopted, polyurethane foam is selected as the thermal insulation material, and a metal frame and a thin steel plate are combined to ensure good thermal insulation performance and structural strength, which can effectively maintain the working temperature inside the stretching machine and reduce heat loss or absorption. In addition, the foam board in the production process is divided into multiple measurement blocks, and a feeler gauge is used to measure the gap between the foam board and the inner wall of the shell in each measurement block to obtain the block gap value, and further calculate the gap over-limit coefficient Jx. If the gap over-limit coefficient Jx exceeds or is equal to the gap over-limit threshold Jxz, an over-limit analysis signal is generated. Through the calculation and analysis of the parameters, the problem of excessive gap between the foam board and the shell in the production of the thermal insulation shell can be discovered in time;

[0077] (2) Based on the over-boundary analysis signal, the bonding strength is measured and compared with the threshold value to accurately identify the weak bonding block and calculate the weak bonding strength difference Rn, which provides a quantitative basis for judging the quality of the bonding strength. At the same time, taking into account the gap over-boundary situation, the number of overlapping blocks Ch and the gap over-boundary ratio Cj are calculated, and then the bonding process abnormality coefficient Yc is obtained. Based on the bonding process abnormality coefficient, the glue influence coefficient is analyzed. Through a series of scientific data processing methods such as drawing scatter plots, dividing target sections, and calculating the mean value of the bonding process abnormality coefficient in the circle, the better glue influence coefficient is successfully screened out. Based on this, the glue amount and glue curing time of the bonding process are optimized and adjusted, the bonding strength of the thermal insulation shell is optimized, the overall structural stability of the shell is enhanced, and the thermal insulation performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] The present invention will be further described below in conjunction with the accompanying drawings.

[0079] Figure 1 This is a production process flow chart of a thermal insulation shell of a film stretching machine of the present invention;

[0080] Figure 2 It is a detection flow chart in the production process of a thermal insulation shell of a film stretching machine of the present invention;

[0081] Figure 3 It is a flow chart of a method for obtaining a better glue influence coefficient in a production process of a thermal insulation shell of a film stretching machine in the present invention. DETAILED DESCRIPTION

[0082] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0083] Example 1

[0084] See also Figure 1 As shown, the present invention is a production process for a thermal insulation shell of a film stretching machine, comprising:

[0085] like Figure 1 As shown, a production process of a thermal insulation shell of a film stretching machine is:

[0086] S1. According to the drawing of the stretching machine of the film machine, determine the shape and size of the insulation shell and draw the drawing. According to the working temperature and insulation working conditions of the stretching machine, use polyurethane foam as the insulation material;

[0087] The heat preservation shell is a detachable structure, which is convenient for installation and maintenance. The shell consists of a metal frame and a metal panel. The frame is welded with angle steel, and the panel is made of thin steel plate. An appropriate number of switchable ventilation holes are designed on the shell.

[0088] S2. Cut the polyurethane foam board so that the size of the foam board matches the size of the inner part of the shell, and weld the angle steel into a frame structure using an electric welder according to the designed size;

[0089] S3. Cut the thin steel plate into the size specified in the drawing as the outer shell panel, fix the panel to the frame with rivets to form an insulating outer shell, use a punching machine to punch holes of the required size on the panel, and install a ventilation net;

[0090] S4. Place the cut polyurethane foam board into the shell so that it fits closely to the inner wall of the shell, use glue to fix the polyurethane foam board on the shell, and seal the joints of the thermal insulation material;

[0091] S5. Select high temperature corrosion resistant paint to spray paint the shell. First spray the primer, and then spray the topcoat after the primer is dry.

[0092] Example 2

[0093] like Figure 2 As shown, based on Example 1, a production process for a thermal insulation shell of a film stretching machine described in an embodiment of the present invention dynamically identifies the amount of glue and the curing time of the bonding process in S4 in which the polyurethane foam board is fixed to the shell using glue, including the following steps:

[0094] Step 1, dividing the foam board into a plurality of measurement blocks, using a feeler gauge to measure the gap between the foam board and the inner wall of the shell of each measurement block to obtain a block gap value, comparing the block gap value with the block gap threshold, marking the block gap value greater than the block gap threshold as a gap out-of-bounds block, performing ratio processing on the total number of gap out-of-bounds blocks and the total number of blocks to obtain a gap out-of-bounds block ratio Qk, performing ratio processing on the mean value of the block gap difference and the block gap threshold to obtain a block gap difference ratio Jc, calculating a gap out-of-bounds coefficient Jx based on the gap out-of-bounds block ratio Qk and the block gap difference Jc, the gap out-of-bounds coefficient Jx≥the gap out-of-bounds threshold Jxz, and generating an out-of-bounds analysis signal;

[0095] Divide the foam board into several blocks and mark each block as a measurement block;

[0096] Use a feeler gauge to measure the gap between the foam board of each measuring block and the inner wall of the shell to obtain the block gap value;

[0097] Compare the block gap value with the block gap threshold;

[0098] If the block gap value is greater than the block gap threshold, the measurement block whose block gap value is greater than the block gap threshold is marked as a gap out-of-bounds block;

[0099] It should be noted that the block gap threshold is set by professionals in this field;

[0100] Get the number of all gap out-of-bounds blocks to get the total number of gap out-of-bounds blocks;

[0101] The total number of gap-out-of-bounds blocks is processed by ratio with the total number of blocks to obtain the gap-out-of-bounds block ratio, and the gap-out-of-bounds block ratio is marked as Qk;

[0102] Calculate the difference between the block gap value of each gap-out-of-bounds block and the block gap threshold to obtain the block gap difference;

[0103] Calculate the block gap differences of all the blocks with gaps exceeding the boundary to obtain the total value of the block gap differences;

[0104] The total value of the block gap difference is processed by ratio with the total number of blocks with gaps exceeding the boundary to obtain the mean value of the block gap difference;

[0105] The block gap difference mean is processed by ratio with the block gap threshold to obtain the block gap difference ratio, and the block gap difference ratio is marked as Jc;

[0106] Calculate the gap over-bound coefficient Jx based on the gap over-bound block ratio Qk and the block gap difference ratio Jc;

[0107] By formula: The gap over-limit coefficient Jx is calculated, where a1 and a2 are preset proportional coefficients;

[0108] Compare the gap over-bound coefficient Jx with the gap over-bound threshold Jxz;

[0109] If the gap over-boundary coefficient Jx ≥ the gap over-boundary threshold Jxz, it indicates that the gap of the foam board is too large, and an over-boundary analysis signal is generated;

[0110] If the gap over-limit coefficient Jx is less than the gap over-limit threshold Jxz, it indicates that the gap of the foam board is within the normal range, and it is still necessary to continue to detect the change of the gap over-limit coefficient Jx;

[0111] Step 2: Based on the over-boundary analysis signal, a universal testing machine is used to test the bonding strength of the foam board and the shell bonding sample to obtain the bonding strength, and the bonding strength is marked as a weak bonding block with a bonding strength lower than the bonding strength threshold. The weak bonding strength mean difference of all weak bonding blocks is calculated and the ratio is processed with the bonding strength threshold to obtain the weak bonding strength difference ratio Rn, the total number of overlapping blocks marked as weak bonding blocks and gap over-boundary blocks is obtained, and the total number of overlapping blocks is compared with the total number of measured blocks to obtain the overlapping block number ratio Ch, the gap over-boundary coefficient and the gap over-boundary threshold are calculated to obtain the gap over-boundary difference, and then the gap over-boundary threshold is compared to obtain the gap over-boundary ratio Cj, and the bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch and the gap over-boundary ratio Cj. If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold Ycz, an unqualified analysis signal is generated;

[0112] For each measurement block, a universal testing machine was used to measure the bonding strength of the glue filled between the foam board and the inner wall of the shell;

[0113] The specific glue bonding strength measurement is as follows:

[0114] SS1. Prepare samples of each measuring block, where the foam board is bonded to the shell material, and install the samples on the fixture of the universal testing machine, with the bonding part at the center of the fixture to maintain uniform force;

[0115] SS2. Adjust the distance between the fixtures so that the sample will not be disturbed by additional forces during the test. Set the test parameters of the universal testing machine, set the universal testing machine to tensile mode, and the loading speed is 5 mm / min.

[0116] SS3. Start the universal testing machine and gradually increase the tensile force on the sample according to the set parameters. When the bonding part of the foam board is damaged, record the maximum tensile force value at the time of damage and mark the maximum tensile force value as the destructive force.

[0117] Obtain the bonding area of ​​a single measurement block, perform ratio processing on the destructive force and the bonding area, and obtain the bonding strength;

[0118] For example, if the bonding area is 10000mm 2 , the destructive force is 500N, and the bonding strength is 0.05N / mm 2 , i.e. 50Kpa;

[0119] Obtaining the bonding strength of each measurement block, and if the bonding strength is lower than a bonding strength threshold, marking the measurement block as a weak bonding block;

[0120] Obtain the bonding strength of all weak bonding blocks to obtain the total value of weak bonding strength;

[0121] Obtain the number of all weakly bonded blocks to obtain the total number of weakly bonded blocks;

[0122] The total value of weak bond strength is ratioed with the total number of weak bond blocks to obtain the mean value of weak bond strength;

[0123] The difference between the mean value of weak bond strength and the bond strength threshold is taken and the absolute value is taken to obtain the weak bond strength difference;

[0124] The ratio of the weak bonding strength difference to the bonding strength threshold is calculated to obtain the weak bonding strength difference ratio, and the weak bonding strength difference ratio is marked as Rn;

[0125] It should be noted that the bonding strength threshold is set by professionals in this field based on experience;

[0126] Obtain blocks that are marked as weakly bonded blocks and gap out-of-bounds blocks at the same time, and obtain overlapping blocks;

[0127] Get the number of overlapping blocks and calculate the total number of overlapping blocks;

[0128] The total number of overlapping blocks is processed by ratio with all measured blocks to obtain the overlapping block number ratio, which is marked as Ch;

[0129] Calculate the difference between the gap over-bound coefficient Jx and the gap over-bound threshold Jxz to obtain the gap over-bound difference;

[0130] The gap over-boundary difference is processed as a ratio with the gap over-boundary threshold Jxz to obtain the gap over-boundary ratio, and the gap over-boundary ratio is marked as Cj;

[0131] The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch, and the gap over-limit ratio Cj;

[0132] By formula: Among them, b1, b2, and b3 are preset proportional coefficients;

[0133] Compare the bonding process abnormality coefficient Yc with the bonding process abnormality coefficient threshold value Ycz;

[0134] If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell is unqualified, and an unqualified analysis signal is generated;

[0135] If the bonding process abnormality coefficient Yc is less than the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell meets the expected production requirements, but it is still necessary to continuously monitor the change of the bonding process abnormality coefficient Yc;

[0136] The technical solution of this embodiment is as follows: the foam board is divided into a plurality of measurement blocks, the gap between the foam board of each block and the inner wall of the shell is measured to obtain the block gap value, the block gap value is compared with the block gap threshold, the block greater than the block gap threshold is marked as a gap over-boundary block, the total number of gap over-boundary blocks is processed by ratio with the total number of blocks to obtain the gap over-boundary block ratio Qk, the mean value of the block gap difference is processed by ratio with the block gap threshold to obtain the block gap difference ratio Jc, the gap over-boundary coefficient Jx is calculated based on the gap over-boundary block ratio Qk and the block gap difference Jc, the gap over-boundary coefficient Jx ≥ the gap over-boundary threshold Jxz, an over-boundary analysis signal is generated, and based on the over-boundary analysis signal, a universal testing machine is used to test the bonding of the foam board and the shell bonding sample. The strength is measured to obtain the bonding strength. The blocks below the bonding strength threshold are marked as weak bonding blocks. The mean difference of the weak bonding strengths of all weak bonding blocks is calculated and compared with the bonding strength threshold to obtain the weak bonding strength difference ratio Rn. The total number of overlapping blocks that are marked as weak bonding blocks and gap out-of-bounds blocks is obtained, and the overlapping block number ratio Ch is calculated. The difference between the gap out-of-bounds coefficient and the gap out-of-bounds threshold is calculated to obtain the gap out-of-bounds difference, which is then compared with the gap out-of-bounds threshold to obtain the gap out-of-bounds ratio Cj. The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch and the gap out-of-bounds ratio Cj. If the bonding process abnormality coefficient Yc≥the bonding process abnormality coefficient threshold Ycz, an unqualified analysis signal is generated.

[0137] Example 3

[0138] Based on Example 2, a production process of a thermal insulation shell of a film stretching machine described in an embodiment of the present invention includes:

[0139] Step 3: Based on the unqualified analysis signal, the product of the glue amount and the curing time is used as the glue influence coefficient, and a scatter plot is drawn with the glue influence coefficient as the X-axis and the bonding process abnormality coefficient as the Y-axis. The abnormal reference line is drawn with the bonding process abnormality coefficient threshold, and the numerical points in the scatter plot that are lower than the abnormal reference line are obtained. The X-axis is divided into multiple sections as the target section, and the coordinates of the midpoint of the target section are calculated and the nearest numerical point is obtained therefrom. A numerical circle is drawn with the numerical point as the center and the length of the target section as the diameter, and the bonding process abnormality coefficients of the numerical points in the numerical circle are summed and averaged to obtain the mean of the bonding process abnormality coefficients in the circle. The X-axis coordinate corresponding to the minimum mean value of the abnormality coefficient in the circle is selected as the optimal glue influence coefficient, and the glue amount and glue curing time of the bonding process are adjusted based on the optimal glue influence coefficient.

[0140] like Figure 3 As shown in the figure, the method for obtaining the optimal glue influence coefficient is:

[0141] Obtain the glue amount and glue curing time of the overlapping blocks, multiply the glue amount and the glue curing time to obtain the glue influence coefficient;

[0142] It should be noted that the amount of glue used directly affects the bonding strength between the foam board and the shell. If the amount of glue used is too little, it cannot provide sufficient bonding force, resulting in a low bonding strength coefficient. The glue curing time determines the time it takes for the glue to reach the optimal bonding strength. If the curing time is too short, the glue may not be fully cured, resulting in low bonding strength. Low bonding strength leads to unqualified production processes of the foam board and the shell.

[0143] Obtain the bonding process abnormality coefficient Yc under different glue influence coefficients;

[0144] In a two-dimensional rectangular coordinate system, the glue influence coefficient is taken as the X-axis and the bonding process abnormality coefficient is taken as the Y-axis, and a scatter plot of the glue influence coefficient-bonding process abnormality coefficient is drawn;

[0145] Taking the bonding process abnormal coefficient threshold value Ycz as the abnormal reference value, an abnormal reference line is drawn in a two-dimensional rectangular coordinate system based on the abnormal reference value;

[0146] It should be noted that the glue influence coefficient has a limited upper limit value because the glue dosage and glue curing time are too high and do not conform to the manufacturing process of the bonding process;

[0147] Obtain the numerical points on the scatter plot of glue influence coefficient-bonding process abnormality coefficient that are lower than the abnormal reference line;

[0148] Divide the X-axis where the glue influence coefficient is located into multiple sections, and mark the sections as target sections;

[0149] Calculate the coordinates of the midpoint of the target segment, and obtain the nearest numerical point with the midpoint of the target block to obtain the nearest numerical point;

[0150] Draw a numerical circle with the nearest numerical point as the center and the target segment length as the diameter;

[0151] Obtain the bonding process abnormality coefficient value of the numerical point in the numerical circle, calculate the sum of the bonding process abnormality coefficients of all the numerical points in the numerical circle, and obtain the sum of the abnormality coefficients in the circle;

[0152] Ratio the sum of the abnormal coefficients within the circle to the number of numerical points within the numerical circle to obtain the mean of the abnormal coefficients within the circle;

[0153] Obtain the mean of the intra-circle abnormal coefficients of all value circles, and put the mean of the intra-circle abnormal coefficients of all value circles into the abnormal coefficient set L as an element;

[0154] Arrange the elements in the abnormal coefficient set L in ascending order;

[0155] Select the element with the smallest value, that is, the mean of the anomaly coefficient within the smallest circle;

[0156] Obtain the X-axis coordinate corresponding to the mean value of the abnormal coefficient in the minimum circle, and mark the glue influence coefficient value of the obtained X-axis coordinate as the better glue influence coefficient;

[0157] Adjust the glue amount and glue curing time of the bonding process based on the optimal glue influence coefficient;

[0158] The technical solution of this embodiment is: based on the unqualified analysis signal, the product of the glue amount and the curing time is used as the glue influence coefficient, a scatter plot is drawn with the glue influence coefficient as the X-axis and the bonding process abnormality coefficient as the Y-axis, and an abnormal reference line is drawn with the bonding process abnormality coefficient threshold, the numerical points in the scatter plot that are lower than the abnormal reference line are obtained, the X-axis is divided into multiple sections as target sections, the coordinates of the midpoint of the target section are calculated and the nearest numerical point is obtained therefrom, a numerical circle is drawn with the numerical point as the center and the length of the target section as the diameter, the bonding process abnormality coefficients of the numerical points in the numerical circle are summed and averaged to obtain the mean of the bonding process abnormality coefficients in the circle, the X-axis coordinate corresponding to the minimum mean of the abnormality coefficient in the circle is selected as the optimal glue influence coefficient, and the glue amount and glue curing time of the bonding process are adjusted based on the optimal glue influence coefficient, so as to improve the glue bonding strength and further improve the process manufacturing level.

[0159] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A production process for a thermal insulation shell of a film stretching machine, characterized in that: The following steps are involved: In the process of fixing the polyurethane foam board to the shell with glue, the amount of glue and curing time of the foam board bonding process are dynamically identified; The foam board is divided into a plurality of measurement blocks, and the gap between the foam board and the inner wall of the shell of each measurement block is measured with a feeler gauge to obtain a block gap value, and the block gap value is compared with the block gap threshold, and the block gap value greater than the block gap threshold is marked as a gap out-of-bounds block, and the total number of gap out-of-bounds blocks is processed by ratio processing to the total number of blocks to obtain a gap out-of-bounds block ratio Qk, and the mean value of the block gap difference is processed by ratio processing to the block gap threshold to obtain a block gap difference ratio Jc, and the gap out-of-bounds coefficient Jx is calculated based on the gap out-of-bounds block ratio Qk and the block gap difference Jc, and the gap out-of-bounds coefficient Jx ≥ the gap out-of-bounds threshold Jxz, and an out-of-bounds analysis signal is generated; Based on the over-boundary analysis signal, a universal testing machine is used to test the bonding strength of the foam board and the shell bonding sample to obtain the bonding strength, and the bonding strength is marked as a weak bonding block with a bonding strength lower than the bonding strength threshold. The weak bonding strength mean difference of all weak bonding blocks is calculated and compared with the bonding strength threshold to obtain the weak bonding strength difference ratio Rn. The total number of overlapping blocks marked as weak bonding blocks and gap over-boundary blocks is obtained, and the total number of overlapping blocks is compared with the total number of measured blocks to obtain the overlapping block number ratio Ch. The gap over-boundary coefficient and the gap over-boundary threshold are calculated to obtain the gap over-boundary difference, which is then compared with the gap over-boundary threshold to obtain the gap over-boundary ratio Cj. The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch and the gap over-boundary ratio Cj. If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold Ycz, an unqualified analysis signal is generated; Based on the unqualified analysis signal, the product of glue amount and curing time is used as the glue influence coefficient. A scatter plot is drawn with the glue influence coefficient as the X-axis and the bonding process abnormality coefficient as the Y-axis, and an abnormal reference line is drawn with the bonding process abnormality coefficient threshold. The numerical points below the abnormal reference line in the scatter plot are obtained, and the X-axis is divided into multiple sections as target sections. The coordinates of the midpoint of the target section are calculated and the nearest numerical point is obtained. A numerical circle is drawn with the numerical point as the center and the length of the target section as the diameter. The bonding process abnormality coefficients of the numerical points in the numerical circle are summed and averaged to obtain the mean of the bonding process abnormality coefficients in the circle. The X-axis coordinate corresponding to the minimum mean value of the abnormality coefficient in the circle is selected as the optimal glue influence coefficient. The glue amount and glue curing time of the bonding process are adjusted based on the optimal glue influence coefficient.

2. The production process of the thermal insulation shell of a film stretching machine according to claim 1, characterized in that: The gap over-limit coefficient Jx is obtained as follows: Calculate the gap over-bound coefficient Jx based on the gap over-bound block ratio Qk and the block gap difference ratio Jc; By formula: The gap over-limit coefficient Jx is calculated, where a1 and a2 are preset proportional coefficients; The super-boundary analysis signal is obtained in the following manner: Compare the gap over-bound coefficient Jx with the gap over-bound threshold Jxz; If the gap over-limit coefficient Jx ≥ the gap over-limit threshold Jxz, it indicates that the gap of the foam board is too large, and an over-limit analysis signal is generated; If the gap over-limit coefficient Jx is less than the gap over-limit threshold Jxz, it indicates that the gap of the foam board is within the normal range, and it is still necessary to continue to detect the change of the gap over-limit coefficient Jx.

3. The production process of the thermal insulation shell of a film stretching machine according to claim 2, characterized in that: The gap over-boundary block ratio Qk is obtained by dividing the foam board into a plurality of blocks and marking each block as a measurement block; Use a feeler gauge to measure the gap between the foam board of each measuring block and the inner wall of the shell to obtain the block gap value; Compare the block gap value with the block gap threshold; If the block gap value is greater than the block gap threshold, the measurement block whose block gap value is greater than the block gap threshold is marked as a gap out-of-bounds block; Get the number of all gap out-of-bounds blocks to get the total number of gap out-of-bounds blocks; The total number of gap-out-of-bounds blocks is processed by ratio with the total number of blocks to obtain the gap-out-of-bounds block ratio, and the gap-out-of-bounds block ratio is marked as Qk; The block gap difference ratio Jc is obtained as follows: Calculate the difference between the block gap value of each gap-out-of-bounds block and the block gap threshold to obtain the block gap difference; Calculate the block gap differences of all the blocks with gaps exceeding the boundary to obtain the total value of the block gap differences; The total value of the block gap difference is processed by ratio with the total number of blocks with gaps exceeding the boundary to obtain the mean value of the block gap difference; The block gap difference mean is ratioed to the block gap threshold to obtain the block gap difference ratio, which is marked as Jc.

4. The production process of the thermal insulation shell of a film stretching machine according to claim 1, characterized in that: The bonding process abnormality coefficient Yc is obtained as follows: The bonding process abnormality coefficient Yc is calculated based on the weak bonding strength difference ratio Rn, the overlapping block number ratio Ch, and the gap over-limit ratio Cj; By formula: Among them, b1, b2, and b3 are preset proportional coefficients; The unqualified analysis signal is generated in the following manner: Compare the bonding process abnormality coefficient Yc with the bonding process abnormality coefficient threshold value Ycz; If the bonding process abnormality coefficient Yc ≥ the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell is unqualified, and an unqualified analysis signal is generated; If the bonding process abnormality coefficient Yc is less than the bonding process abnormality coefficient threshold value Ycz, the bonding process between the foam board and the inner wall of the shell meets the expected production requirements, but it is still necessary to continuously monitor the changes in the bonding process abnormality coefficient Yc.

5. The production process of the thermal insulation shell of a film stretching machine according to claim 4, characterized in that: The weak bonding strength difference ratio Rn is obtained as follows: Obtaining the bonding strength of each measurement block, and if the bonding strength is lower than a bonding strength threshold, marking the measurement block as a weak bonding block; Obtain the bonding strength of all weak bonding blocks to obtain the total value of weak bonding strength; Obtain the number of all weakly bonded blocks to obtain the total number of weakly bonded blocks; The total value of weak bond strength is ratioed with the total number of weak bond blocks to obtain the mean value of weak bond strength; The difference between the mean value of weak bond strength and the bond strength threshold is taken and the absolute value is taken to obtain the weak bond strength difference; The ratio of the weak bonding strength difference to the bonding strength threshold is calculated to obtain the weak bonding strength difference ratio, which is marked as Rn.

6. The production process of the thermal insulation shell of a film stretching machine according to claim 5, characterized in that: The bonding strength is obtained as follows: For each measurement block, a universal testing machine was used to measure the bonding strength of the glue filled between the foam board and the inner wall of the shell; The specific glue bonding strength measurement is as follows: SS1. Prepare samples of each measuring block, where the foam board is bonded to the shell material, and install the samples on the fixture of the universal testing machine, with the bonding part at the center of the fixture to maintain uniform force; SS2. Adjust the distance between the fixtures so that the sample will not be disturbed by additional forces during the test. Set the test parameters of the universal testing machine, set the universal testing machine to tensile mode, and the loading speed is 5 mm / min. SS3. Start the universal testing machine and gradually increase the tensile force on the sample according to the set parameters. When the bonding part of the foam board is damaged, record the maximum tensile force value at the time of damage and mark the maximum tensile force value as the destructive force. The bonding area of ​​a single measurement block is obtained, and the destructive force is ratioed to the bonding area to obtain the bonding strength.

7. The production process of the thermal insulation shell of a film stretching machine according to claim 4, characterized in that: The method for obtaining the overlapping block number ratio Ch is as follows: Obtain blocks marked as both weakly bonded blocks and gap out-of-bounds blocks, and obtain overlapping blocks; Get the number of overlapping blocks and calculate the total number of overlapping blocks; The total number of overlapping blocks is processed by ratio with all measured blocks to obtain the overlapping block number ratio, which is marked as Ch; The gap over-limit ratio Cj is obtained as follows: Calculate the difference between the gap over-boundary coefficient Jx and the gap over-boundary threshold Jxz to obtain the gap over-boundary difference; The gap out-of-bounds difference is ratioed with the gap out-of-bounds threshold Jxz to obtain the gap out-of-bounds ratio, and the gap out-of-bounds ratio is marked as Cj.

8. The production process of the thermal insulation shell of a film stretching machine according to claim 1, characterized in that: The method for obtaining the optimal glue influence coefficient is: Obtain the mean of the intra-circle abnormal coefficients of all value circles, and put the mean of the intra-circle abnormal coefficients of all value circles into the abnormal coefficient set L as an element; Arrange the elements in the abnormal coefficient set L in ascending order; Select the element with the smallest value, that is, the mean of the anomaly coefficient within the smallest circle; The X-axis coordinate corresponding to the mean value of the abnormal coefficient in the minimum circle is obtained, and the glue influence coefficient value of the obtained X-axis coordinate is marked as the better glue influence coefficient.

9. The production process of the thermal insulation shell of a film stretching machine according to claim 8, characterized in that: The method for obtaining the numerical circle is as follows: Obtain the numerical points on the scatter plot of glue influence coefficient-bonding process abnormality coefficient that are lower than the abnormal reference line; Divide the X-axis where the glue influence coefficient is located into multiple sections, and mark the sections as target sections; Calculate the coordinates of the midpoint of the target segment, and obtain the nearest numerical point with the midpoint of the target block to obtain the nearest numerical point; Draw a numerical circle with the nearest numerical point as the center and the target segment length as the diameter; Obtain the bonding process abnormality coefficient value of the numerical point in the numerical circle, calculate the sum of the bonding process abnormality coefficients of all the numerical points in the numerical circle, and obtain the sum of the abnormality coefficients in the circle; The sum of the anomaly coefficients within the circle is ratioed with the number of numerical points within the numerical circle to obtain the mean of the anomaly coefficients within the circle.

10. The production process of the heat-insulating shell of a film stretching machine according to claim 9, characterized in that: The method for obtaining the scatter plot of the glue influence coefficient-bonding process abnormality coefficient is as follows: Obtain the glue amount and glue curing time of the overlapping blocks, multiply the glue amount and the glue curing time to obtain the glue influence coefficient; Obtain the bonding process abnormality coefficient Yc under different glue influence coefficients; In a two-dimensional rectangular coordinate system, the glue influence coefficient is taken as the X-axis and the bonding process abnormality coefficient is taken as the Y-axis, and a scatter plot of the glue influence coefficient-bonding process abnormality coefficient is drawn; The abnormal coefficient threshold value Ycz of the bonding process is used as the abnormal reference value, and the abnormal reference line is drawn in the two-dimensional rectangular coordinate system based on the abnormal reference value.

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