Glue tank level measurement and control device for continuous production of sheet molding compounds

Abstract

The invention discloses a glue tank liquid level measurement control device for continuous production of sheet molding compound, which is applied to the technical field of sheet molding compound production, and comprises a marking component including a slide rail 1 and a first cylinder fixed on a fixed plate, the first cylinder is provided with two groups, which are respectively fixed on the front and rear sides of the fixed plate, a connecting block 1 is fixed on the output end of the first cylinder, a marking block is fixed on one side of the connecting block 1, and a visual unit is fixed on each group of the baffles; a limiting flow component is provided on the glue guide pipe for controlling the speed at which the resin glue flows down, a slide rail 2 is fixed on each group of the mounting strips, the connecting block 2 is slidably connected to the slide rail 2, a limiting plate is fixed between the two groups of the connecting blocks 2, and the limiting plate is located at the outlet of the glue guide pipe. The invention can accurately control the amount of scraped resin paste in real time during the continuous production of SMC, thereby accurately controlling the unit weight of the SMC sheet, without hysteresis, and preventing material breakage.

Description

Technical Field

[0001] The invention relates to the technical field of sheet molding compound production, in particular to a glue tank liquid level measurement control device for continuous production of sheet molding compound. Background Art

[0002] Sheet molding compound (SMC) is a type of sheet molding material made of resin paste impregnated fiber or chopped fiber mat covered with polyethylene film on both sides. It has the properties of electrical insulation, heat resistance, flame retardancy, good mechanical strength, light weight, easy and flexible engineering design, etc. Its mechanical properties are comparable to those of some metal materials.

[0003] As the automation of molding becomes higher and higher, the consistency of SMC unit weight is also required to be higher and higher. SMC unit weight refers to the weight of SMC per unit area. An important factor affecting unit weight is the instability of the amount of resin paste scraped off. There are many reasons for instability, such as: viscosity of resin paste, temperature, and the level of resin paste in the glue tank.

[0004] The invention patent with announcement number CN110726371A discloses a SMC sheet thickness detection device. There is a hysteresis in measuring the thickness to adjust the unit weight of the SMC sheet. The thickness can only be detected after the sheet is soaked. The unit weight of this section cannot be controlled. In addition, the thickness of the glass fiber stacking in the SMC sheet is different, and the bubbles generated by the glass fiber stacking affect the detection value. The invention patent with announcement number CN109454896B discloses a method for controlling the mass flow rate in the continuous production of fluid materials. The scraper gap is adjusted by detecting the liquid level of the glue tank. When the flow rate entering the glue tank decreases, the amount entering the glue tank is less than the amount scraped out, and the liquid level of the glue tank decreases. At this time, the scraper will increase the gap between the scraper and the film, which will affect the unit weight and even cause SMC material shortages, production line shutdown, and unnecessary waste.

[0005] In this regard, we have found that when the liquid level in the glue tank is controlled within a certain range, the unit weight stability of the SMC sheet is improved by 50% compared with the existing unit weight stability. Therefore, it is necessary to provide a glue tank liquid level measurement and control device for continuous production of plastic molding materials. Through the automatic adjustment system, the amount of scraped resin paste can be accurately controlled in real time during the continuous production of SMC, thereby accurately controlling the unit weight of the SMC sheet without hysteresis and preventing material breakage. Summary of the invention

[0006] The object of the present invention is to provide a device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compounds, so as to solve the problems raised in the above-mentioned background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: side plates, two groups of baffles, a scraper, a glue guide pipe and a flow control system, the resin glue in the glue guide pipe falls into the glue groove and then flows out from the bottom of the scraper, the resin glue does not fill the bottom of the glue groove, and an arc with a certain width is formed in the glue groove, each group of the side plates is provided with a fixed plate on the outside, each group of the fixed plates is provided with a marking component, and the marking component is convenient for limiting the width of the arc formed by the resin glue, wherein:

[0008] The marking assembly includes a slide rail 1 and a first cylinder fixed on a fixed plate. The first cylinder is provided with two groups, which are respectively fixed on the front and rear sides of the fixed plate. A connecting block 1 is fixed to the output end of the first cylinder. A marking block is fixed to one side of the connecting block 1. The marking block is slidably connected to the slide rail 1.

[0009] A visual unit is hung on the glue slot, and a color is set on the marking block;

[0010] A limiting flow component is arranged on the glue guiding pipe, which is used to control the speed at which the resin glue flows down. The limiting flow component includes two groups of mounting bars, each group of the mounting bars is fixed on both sides of the glue guiding pipe, a second cylinder is fixed on one side of each group of the mounting bars, a connecting block 2 is fixed on the output end of the second cylinder, a slide rail 2 is fixed on each group of the mounting bars, the connecting block 2 is slidably connected to the slide rail 2, a limiting plate is fixed between the two groups of the connecting blocks 2, and the limiting plate is located at the outlet of the glue guiding pipe.

[0011] According to the above technical solution, the two groups of baffles are fixed on the left and right sides of the side plates, and the scraper is fixed on the other side of the two groups of side plates. A glue groove is formed by the side plates, the two groups of baffles and the scraper. A bottom plate is provided at the bottom of the glue groove, and a gap one is formed between the scraper and the bottom plate. A supporting platform is provided below the bottom plate, and a gap two is formed between the supporting platform and the bottom plate.

[0012] According to the above technical solution, one end of the glue guiding pipe is connected to a resin glue liquid source 1, the pipe between the glue guiding pipe and the resin glue liquid source 1 is connected to a liquid delivery pump 1, the pipe between the glue guiding pipe and the resin glue liquid source 1 is connected to a spare pipe, the spare pipe is connected to a liquid delivery pump 2, and the other end of the spare pipe is connected to a resin glue liquid source 2.

[0013] According to the above technical solution, the glue tank liquid level measurement and control device for continuous production of sheet molding materials also includes a flow control system, which includes a visual acquisition module and a processing module. The visual acquisition module includes an image receiving submodule, a logic judgment submodule and a time recording submodule. The image receiving submodule is electrically connected to the visual unit and is used to identify the width of the arc formed by the resin glue. The time recording submodule is used to judge the width time of the arc formed by the resin glue, and the logic judgment submodule is used to analyze the speed at which the resin glue flows out of the glue guiding pipe.

[0014] According to the above technical solution, the logic judgment submodule includes a position identification unit.

[0015] According to the above technical solution, the processing module includes a lifting sub-module, a warning sub-module and an adjustment sub-module. The lifting sub-module is electrically connected to the second cylinder and is used to control the limit plate to move up and down at the outlet of the glue guide pipe. The warning sub-module serves as an alarm. The adjustment sub-module is electrically connected to liquid delivery pump one and liquid delivery pump two. The adjustment sub-module is used to adjust the state of the resin glue entering the glue guide pipe.

[0016] According to the above technical solution, the flow control system includes the following specific operating steps:

[0017] Step 1: Before starting production, according to the product material requirements, move the marking block to the appropriate position through the marking component to facilitate identification of whether the resin glue is in the marked position;

[0018] Step 2: Start the liquid delivery pump 1 to transfer the resin glue from the resin glue source to the glue guide pipe and then flow it into the glue tank, and then start the external winding component to drive the film to move at high speed in the gap 2;

[0019] Step 3: Use the visual unit to identify the width of the arc formed by the resin glue in the glue tank, determine the flow rate of the resin glue entering the glue tank, and then control the amount entering the glue tank through the current limiting component to control the stable range of the resin glue in the glue tank, accurately control the unit weight of the SMC sheet, without hysteresis, and prevent material breakage;

[0020] Step 4: When the amount of resin glue in the glue tank is controlled to be within a stable range, it is necessary to determine in real time the time it takes for the amount of resin glue to stabilize to determine whether the resin glue is precipitated and solidified during the process of flowing out of the glue guide pipe.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention can adjust the amount of the resin glue entering the glue tank in real time by setting the limited flow component and the camera, and always ensure that the resin glue in the glue tank maintains a normal state, so as to accurately control the unit weight of the SMC sheet, overcome the hysteresis problem in the prior art, and prevent material breakage;

[0022] By providing a second resin glue source, when the resin glue in the first resin glue source is in a poor state, the resin glue in the first resin glue source is suspended from entering the glue guiding pipe, so that the resin glue in the second resin glue source enters the glue guiding pipe, thereby improving the quality of the resin glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a side schematic diagram of the glue tank of the present invention;

[0026] Figure 3 The present invention Figure 1 A local enlarged schematic diagram of area A;

[0027] Figure 4 The present invention Figure 1 A local enlarged schematic diagram of area B;

[0028] Figure 5 is a schematic diagram of a flow control system of the present invention;

[0029] Figure 6 It is a schematic diagram of the resin glue state of the present invention;

[0030] Figure 7 It is a schematic diagram of the marking block state of the present invention;

[0031] Figure 8 It is a pipeline schematic diagram of the present invention;

[0032] In the figure: 1. side panel; 2. glue guide pipe; 3. baffle; 4. visual unit; 5. scraper; 6. glue groove; 7. fixing plate; 8. first cylinder; 9. marking block; 10. slide rail one; 11. mounting strip; 12. second cylinder; 13. limit plate; 14. slide rail two; 15. connecting block two; 16. connecting block one; 17. gap one; 18. supporting platform; 19. bottom plate; 20. liquid delivery pump one; 21. resin glue liquid source one; 22. resin glue liquid source two; 23. liquid delivery pump two; 24. spare pipe; 25. gap two. DETAILED DESCRIPTION

[0033] 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.

[0034] See also Figure 1-8 The present invention provides a technical solution: a glue tank liquid level measurement and control device for continuous production of sheet molding materials, comprising a side plate 1, two groups of baffles 3, a scraper 5 and a glue guide pipe 2, the two groups of baffles 3 are fixed on the left and right sides of the side plate 1, the scraper 5 is fixed on the other side of the two groups of side plates 1, a glue tank 6 is formed by the side plate 1, the two groups of baffles 3 and the scraper 5, a bottom plate 19 is provided at the bottom of the glue tank 6, a gap 17 is formed between the scraper 5 and the bottom plate 19, a bearing platform 18 is provided below the bottom plate 19, a gap 25 is formed between the bearing platform 18 and the bottom plate 19, a film is passed through the gap 25 so that the film is attached to the bearing platform 18, the film is controlled to move on the bearing platform 18 by an external winding component, the glue guide pipe 2 guides the resin glue into the glue tank 6, the resin glue will flow from the gap 17 to the surface of the film, because the film is pulled by the external winding component and moves at a high speed, the resin glue in the glue tank 6 will be pulled into an arc (such as Figure 6 As shown), the resin glue will not fill the entire bottom of the glue groove 6, so as to avoid the resin glue filling the entire glue groove 6 and solidifying before the glue is applied, thereby affecting the stability of the glue coating and scraping.

[0035] A visual unit 4 is suspended on the glue groove 6 , and the visual unit 4 may be a camera.

[0036] One end of the glue guiding pipe 2 is connected to a resin glue source 21, and a liquid delivery pump 20 is connected to the pipe between the glue guiding pipe 2 and the resin glue source 21. Start the liquid delivery pump 20 to transfer the resin glue at the resin glue source 21 to the glue guiding pipe 2. A spare pipe 24 is connected to the pipe between the glue guiding pipe 2 and the resin glue source 21, and a liquid delivery pump 23 is connected to the spare pipe 24. The other end of the spare pipe 24 is connected to a resin glue source 22, and the resin glue source 22 is used as a spare.

[0037] A fixed plate 7 is arranged on the outer side of each group of side panels 1, and a marking component is arranged on each group of fixed plates 7. The marking component is convenient for limiting the arc width formed by the resin glue. The marking component includes a slide rail 10 and a first cylinder 8 fixed on the fixed plate 7. The first cylinder 8 is provided with two groups, which are respectively fixed on the front and rear sides of the fixed plate 7. A connecting block 16 is fixed on the output end of the first cylinder 8, and a marking block 9 is fixed on one side of the connecting block 16. The marking block 9 is slidably connected to the slide rail 10. By starting the first cylinder 8 to extend and retract, the marking block 9 is driven to slide on the fixed plate 7, thereby determining the positions of the two groups of marking blocks 9, and then determining the distance between the two groups of marking blocks 9.

[0038] The marking block 9 is provided with colors.

[0039] A limiting flow component is provided on the glue guiding pipe 2 for controlling the speed at which the resin glue flows down. The limiting flow component includes two groups of mounting bars 11, each group of mounting bars 11 is fixed on both sides of the glue guiding pipe 2, a second cylinder 12 is fixed on one side of each group of mounting bars 11, a connecting block 2 15 is fixed on the output end of the second cylinder 12, a slide rail 2 14 is fixed on each group of mounting bars 11, the connecting block 2 15 is slidably connected to the slide rail 2 14, a limiting plate 13 is fixed between the two groups of connecting blocks 2 15, the limiting plate 13 is located at the outlet of the glue guiding pipe 2, and the limiting plate 13 is driven to move up and down at the outlet of the glue guiding pipe 2 by controlling the extension and contraction of the second cylinder 12, so as to control the size of the outlet of the glue guiding pipe 2, and facilitate the control of the amount of resin glue flowing out.

[0040] The glue tank level measurement control device for continuous production of sheet molding compound also includes a flow control system, which includes a visual acquisition module and a processing module. The visual acquisition module includes an image receiving submodule, a logic judgment submodule and a time recording submodule. The image receiving submodule is electrically connected to the visual unit 4 and is used to identify the width of the arc formed by the resin glue. The time recording submodule is used to judge the width time of the arc formed by the resin glue, and the logic judgment submodule is used to analyze the speed at which the resin glue flows out of the glue guide pipe 2.

[0041] The logic judgment submodule includes a position identification unit;

[0042] The processing module includes a lifting submodule, a warning submodule and an adjustment submodule. The lifting submodule is electrically connected to the second cylinder 12 and is used to control the limit plate 13 to move up and down at the outlet of the glue guide pipe 2. The warning submodule serves as an alarm. The adjustment submodule is electrically connected to the liquid delivery pump 1 20 and the liquid delivery pump 2 23. The adjustment submodule is used to adjust the state of the resin glue entering the glue guide pipe 2.

[0043] The flow control system includes the following specific operating steps:

[0044] Step 1: Before starting production, according to the product material requirements, move the marking block 9 to the appropriate position through the marking component to facilitate identification of whether the resin glue is in the marked position;

[0045] Specifically, the first air cylinder 8 is activated to extend and retract to drive the marking block 9 to slide on the fixed plate 7, thereby determining the positions of the two groups of marking blocks 9 and further determining the distance between the two groups of marking blocks 9.

[0046] Step 2: Start the liquid delivery pump 20 to transfer the resin glue liquid at the resin glue liquid source 21 to the glue guide pipe 2 and then flow it into the glue tank 6, and then start the external winding component to drive the film to move at high speed in the gap 25;

[0047] Step 3: Identify the width of the arc formed by the resin glue in the glue tank 6 through the visual unit 4, determine the flow rate of the resin glue entering the glue tank 6, and then control the amount entering the glue tank 6 through the current limiting component to control the stable range of the resin glue in the glue tank 6, accurately control the unit weight of the SMC sheet, without hysteresis, and prevent material breakage;

[0048] Step 4: When the amount of the resin glue in the glue tank 6 is controlled to be within a stable range, it is necessary to determine in real time the time for the amount of the resin glue to be stable to determine whether the resin glue is precipitated and solidified during the process of flowing out of the glue guide pipe 2 .

[0049] Step 3 includes the following specific steps:

[0050] Step 3-a: Since the distance between the two groups of marking blocks 9 is set, the distance between the arc boundary line formed by the resin glue and the two groups of marking blocks 9 is analyzed to determine the amount of resin glue in the glue tank 6;

[0051] Specifically, in the logic judgment submodule, the distance from the front group of marking blocks 9 to the edge of the fixed plate 7 is set to , set the distance from the rear set of marking blocks 9 to the edge of the fixed plate 7 to (like Figure 7 As shown in FIG. 1 ), the boundary line of the arc formed by the resin glue is located at and The specific position of the resin glue arc is detected and the signal is transmitted to the image receiving submodule. The position recognition unit in the logic judgment submodule analyzes the boundary line of the resin glue arc in real time. and The distance is calculated as: , , where L is the constant distance between the two groups of marker blocks 9, is the distance between the boundary line of the resin glue arc and the edge of the fixing plate 7, is the ratio of the distance between the boundary line of the resin glue arc and the edge of the fixed plate 7 to the constant distance between the two groups of marking blocks 9. When it is, it indicates that the arc-shaped boundary line of the resin adhesive liquid is close to the front marker block 9, indicating that there is a large amount of resin adhesive liquid in the glue tank 6. When When it is, it indicates that the arc-shaped boundary line of the resin adhesive liquid is close to the rear marker block 9, indicating that there is a small amount of resin adhesive liquid in the glue tank 6. When When it is, it indicates that the resin adhesive liquid in the glue tank 6 is just right.

[0052] Step three-b: Control the movement of the flow-limiting component according to the amount of resin adhesive liquid in the glue tank 6, and control the size of the outlet of the glue guiding pipeline 2, so as to control the amount of resin adhesive liquid flowing out, and ensure that the amount of resin adhesive liquid in the glue tank 6 remains in a normal state;

[0053] Specifically, when there is a large amount of resin adhesive liquid in the glue tank 6, a signal is transmitted to the lifting sub-module to control the lowering of the limit plate 13, so that the outlet of the glue guiding pipeline 2 becomes the smallest, reducing the amount of resin adhesive liquid flowing out. When there is a small amount of resin adhesive liquid in the glue tank 6, control the limit plate 13 to be raised to control the outlet of the glue guiding pipeline 2 to become medium, increasing the amount of resin adhesive liquid flowing out. Through this step, the amount of resin adhesive liquid entering the glue tank 6 can be adjusted in real time, always ensuring that the resin adhesive liquid in the glue tank 6 remains in a normal state, thereby accurately controlling the single weight of the SMC sheet, overcoming the problem of hysteresis in the prior art, and preventing material breakage.

[0054] It should be added that the levels for setting the adjustment of the size of the outlet of the glue guiding pipeline 2 are high, medium, and low. High means the outlet of the glue guiding pipeline 2 is the largest, medium means the size of the outlet of the glue guiding pipeline 2 is medium, and low means the size of the outlet of the glue guiding pipeline 2 is the smallest.

[0055] Step four also includes the following specific steps:

[0056] Step four-a: When the resin adhesive liquid in the glue tank 6 remains in a normal state, start the time recording sub-module to start timing, and pause timing until the amount of resin adhesive liquid in the glue tank 6 is abnormal, and judge the flowing speed of the resin adhesive liquid;

[0057] Specifically, the staff sets the conventional time from normal to abnormal of the resin adhesive liquid as T in the time recording sub-module. When the resin adhesive liquid in the glue tank 6 remains in a normal state, start timing in the time recording sub-module, and set the time as until the timing ends when the amount of resin adhesive liquid in the glue tank 6 is abnormal, and set the time as The calculation formula for the flowing speed of the resin adhesive liquid is: where t is the real-time detected time from normal to abnormal of the resin adhesive liquid. When t>T, it indicates that the flowing speed of the resin adhesive liquid is normal. When t<T, it indicates that the flowing speed of the resin adhesive liquid is slow, indicating that the resin adhesive liquid precipitates and solidifies during the process of flowing out of the glue guiding pipeline 2;

[0058] Step 4-b: adjusting the state of the resin glue entering the glue guide pipe 2 in real time according to the speed of the resin glue flowing down, so as to improve the quality of the resin glue flowing down;

[0059] Specifically, when the resin glue liquid precipitates and solidifies during the process of flowing out of the glue guiding pipe 2, it indicates that the resin glue liquid in the resin glue liquid source 1 21 is in a poor state. At this time, a signal is transmitted to the adjustment submodule to control the liquid delivery pump 1 20 to turn off and then turn on the liquid delivery pump 2 23, so as to suspend the resin glue liquid in the resin glue liquid source 1 21 from entering the glue guiding pipe 2, thereby allowing the resin glue liquid in the resin glue liquid source 2 22 to enter the glue guiding pipe 2, thereby improving the quality of the resin glue liquid;

[0060] Step 4-c: While improving the quality of the resin glue flowing down, it is also necessary to determine the amount of resin glue in the glue tank 6, and then adjust the size of the outlet of the glue guide pipe 2 in combination with the quality of the resin glue entering the glue guide pipe 2, so as to further ensure the amount of resin glue flowing into the glue tank 6 without being affected by the quality of the resin glue in the glue guide pipe 2;

[0061] Specifically, when the amount of resin glue in the glue groove 6 is small, and the resin glue precipitates and solidifies in the process of flowing out of the glue guiding pipe 2, in order to avoid the resin glue flowing down the glue guiding pipe 2 too slowly when switching to the resin glue source 22, the current limiting component is controlled to drive the limit plate 13 to lift, and the outlet of the glue guiding pipe 2 is opened and closed to the maximum position, so as to facilitate a large amount of resin glue to fall into the glue groove 6. When the amount of resin glue in the glue groove 6 is large, and the resin glue precipitates and solidifies in the process of flowing out of the glue guiding pipe 2, the limit plate 13 is still controlled to be in the intermediate state, and the outlet of the glue guiding pipe 2 is not controlled to become smaller, so as to avoid the resin glue on the glue guiding pipe 2 from solidifying and affecting the stability of the resin glue flowing into the glue groove 6 normally.

[0062] Through the above steps, when the resin glue source 22 is switched, the size of the outlet of the glue guiding pipe 2 can be adjusted in real time according to the amount of resin glue in the glue tank 6, so that the stability in the glue tank 6 can be better controlled.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A glue tank liquid level measurement and control device for continuous production of sheet molding compound, comprising a side plate (1), two sets of baffles (3), a scraper (5), a glue guide pipe (2) and a flow control system, characterized in that: The resin glue in the glue guide pipe (2) falls into the glue groove (6) and then flows out from the bottom of the scraper (5). The resin glue does not fill the bottom of the glue groove (6), and an arc-shaped arch with a certain width is formed in the glue groove (6). A fixing plate (7) is arranged on the outer side of each group of side plates (1), and a marking component is arranged on each group of fixing plates (7). The marking component is convenient for limiting the width of the arc formed by the resin glue. A bottom plate (19) is arranged at the bottom of the glue groove (6). A gap (17) is formed between the scraper (5) and the bottom plate (19). A bearing platform (18) is arranged below the bottom plate (19), and a gap (25) is formed between the bearing platform (18) and the bottom plate (19). The flow control system comprises the following specific operation steps: Step 1: Before starting production, according to the product material requirements, the marking block (9) is moved to a suitable position through the marking component to facilitate identification of whether the resin glue is in the marked position; Step 2: Start the liquid delivery pump 1 (20) to transfer the resin glue liquid at the resin glue liquid source 1 (21) to the glue guide pipe (2) and then flow it into the glue tank (6), and then start the external winding component to drive the film to move at high speed in the gap 2 (25); Step 3: Identify the width of the arc formed by the resin glue liquid in the glue groove (6) through the visual unit (4), determine the flow rate of the resin glue liquid entering the glue groove (6), and then control the amount entering the glue groove (6) through the current limiting component, control the stable range of the resin glue liquid in the glue groove (6), and accurately control the unit weight of the SMC sheet without hysteresis, so as to prevent material breakage; Step 4: When the amount of the resin glue liquid in the glue tank (6) is controlled to be within a stable range, the time for the amount of the resin glue liquid to be stable is determined in real time to determine whether the resin glue liquid is precipitated and solidified during the process of flowing out of the glue guide pipe (2); The step 4 also includes the following specific steps: Step 4-a: When the amount of the resin glue in the glue tank (6) is maintained at a normal level, the time recording submodule is started to start timing, and the timing is stopped when the amount of the resin glue in the glue tank (6) is abnormal, and the speed of the resin glue flowing down is determined; Step 4-b: adjusting the state of the resin glue liquid entering the glue guide pipe (2) in real time according to the speed of the resin glue liquid flowing down, so as to improve the quality of the resin glue liquid flowing down; Step 4-c: While improving the quality of the resin glue flowing down, determine whether the amount of resin glue in the glue tank (6) is small or large, and then adjust the size of the outlet of the glue guide pipe (2) based on the quality of the resin glue entering the glue guide pipe (2) to further ensure the amount of resin glue flowing into the glue tank (6) without being affected by the quality of the resin glue in the glue guide pipe (2).

2. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 1, characterized in that: The step three includes the following specific steps: Step 3-a: Since the distance between the two groups of marking blocks (9) is set, the distance between the arc boundary line formed by the resin glue and the two groups of marking blocks (9) is analyzed to determine the amount of resin glue in the glue tank (6); Step 3-b: Control the movement of the current limiting component according to the amount of resin glue in the glue groove (6), and control the size of the outlet of the glue guide pipe (2), so as to control the amount of resin glue flowing out, thereby ensuring that the amount of resin glue in the glue groove (6) remains normal.

3. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 1, characterized in that: The marking assembly comprises a slide rail (10) and a first cylinder (8) fixed on a fixed plate (7); the first cylinder (8) is provided with two groups, which are respectively fixed on the front and rear sides of the fixed plate (7); a connecting block (16) is fixed to the output end of the first cylinder (8); a marking block (9) is fixed to one side of the connecting block (16); the marking block (9) is slidably connected to the slide rail (10); A visual unit (4) is suspended on the glue groove (6), and a color is provided on the marking block (9); One end of the glue guide pipe (2) is connected to a resin glue liquid source (21); a liquid delivery pump (20) is connected to the pipe between the glue guide pipe (2) and the resin glue liquid source (21); a spare pipe (24) is connected to the pipe between the glue guide pipe (2) and the resin glue liquid source (21); a liquid delivery pump (23) is connected to the spare pipe (24); and the other end of the spare pipe (24) is connected to a resin glue liquid source (22).

4. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 3, characterized in that: A flow limiting component is provided on the glue guide pipe (2) for controlling the speed at which the resin glue flows downward, the flow limiting component comprising two groups of mounting bars (11), each group of the mounting bars (11) being fixed on both sides of the glue guide pipe (2), a second cylinder (12) being fixed on one side of each group of the mounting bars (11), a second connecting block (15) being fixed on the output end of the second cylinder (12), a second slide rail (14) being fixed on each group of the mounting bars (11), the second connecting block (15) being slidably connected to the second slide rail (14), a limiting plate (13) being fixed between the two groups of the connecting blocks (15), the limiting plate (13) being located at the outlet of the glue guide pipe (2).

5. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 4, characterized in that: The two groups of baffles (3) are fixed to the left and right sides of the side plate (1), and the scraper (5) is fixed to the other side of the two groups of side plates (1). A glue groove (6) is formed by the side plate (1), the two groups of baffles (3) and the scraper (5).

6. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 5, characterized in that: The glue tank liquid level measurement control device for continuous production of sheet molding compound also includes a flow control system, the flow control system includes a visual acquisition module and a processing module, the visual acquisition module includes an image receiving submodule, a logic judgment submodule and a time recording submodule, the image receiving submodule is electrically connected to the visual unit (4) and is used to identify the width of the arc formed by the resin glue, the time recording submodule is used to judge the width time of the arc formed by the resin glue, and the logic judgment submodule is used to analyze the speed of the resin glue flowing out of the glue guide pipe (2).

7. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 6, characterized in that: The logic judgment submodule includes a position identification unit.

8. The device for measuring and controlling the liquid level of a plastic tank for continuous production of sheet molding compound according to claim 7, characterized in that: The processing module comprises a lifting submodule, a warning submodule and an adjustment submodule. The lifting submodule is electrically connected to the second cylinder (12) and is used to control the limit plate (13) to move up and down at the outlet of the glue guide pipe (2). The warning submodule serves as an alarm. The adjustment submodule is electrically connected to the liquid delivery pump 1 (20) and the liquid delivery pump 2 (23). The adjustment submodule is used to adjust the state of the resin glue entering the glue guide pipe (2).

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