A method for automatically controlling tension of a pultrusion creel, computer equipment, and storage medium

Abstract

The present invention relates to the field of pultrusion technology, and in particular to a pultrusion creel tension automatic control method, computer equipment, and storage medium, comprising the following steps: measuring the tension on the yarn when the bobbin is fully wound and when it is empty, measuring the relationship between the friction resistance of the damping mechanism on the bobbin and the displacement of the mechanical connecting rod; determining the displacement of the mechanical connecting rod when the bobbin is fully wound and when it is empty when the tension remains unchanged based on the unwinding torque and the friction torque of the damping mechanism; measuring the total thickness of the yarn on the fully wound bobbin and measuring the real-time thickness of the yarn on the bobbin during unwinding; establishing an inverse function between the real-time adjustment amount of the mechanical connecting rod, the ratio of the real-time thickness of the yarn on the bobbin during unwinding to the total thickness, and the difference between the displacement amounts of the mechanical connecting rod when it is fully wound and when it is empty, and calculating the real-time adjustment amount of the mechanical connecting rod; and adjusting the displacement amount of the mechanical connecting rod in real time based on the real-time adjustment amount of the mechanical connecting rod. In the present invention, the consistency and stability of the yarn unwinding tension are ensured, tension fluctuations are reduced, and versatility is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of pultrusion, and in particular to a pultrusion creel tension automatic control method, computer equipment and storage medium. Background Art

[0002] The pultrusion creel is the first piece of equipment in the entire pultrusion production line. It holds several carbon fiber bobbins, which are passively unwound by the main machine. As the bobbin diameter changes, the yarn tension on the die at each unwinding end increases. This dramatic change in creel tension can affect the stability of the creel's movement, leading to uncontrollable quality issues in the pultruded product.

[0003] Conventional technology adjusts tension through mechanical linkages and elastic damping mechanisms. Each creel layer has a mechanical linkage, and each unwinding section on each layer has an elastic damping mechanism connected to the mechanical linkage. All mechanical linkages are connected to the rear of the creel and controlled together. This adjusts the unwinding tension by varying the friction applied by the elastic damping mechanism on each unwinding section during unwinding. However, manual intervention is required during creel operation, with workers adjusting the tension at regular intervals based on the length of the unwinding section. This does not guarantee uniform tension or consistency throughout the unwinding process.

[0004] In view of the existence of the above problems, the designer, based on many years of rich practical experience and professional knowledge in the engineering application of this type of product, and in conjunction with the application of theory, actively conducts research and innovation, in order to create a pultrusion yarn frame tension automatic control method, computer equipment and storage medium to make it more practical.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the Invention

[0006] The present invention provides a pultrusion creel tension automatic control method, computer equipment and storage medium, thereby effectively solving the problems in the background technology.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a method for automatically controlling the tension of a pultrusion creel, comprising the following steps:

[0008] Measure the yarn tension when the bobbin is full and empty, and measure the relationship between the friction resistance of the damping mechanism on the bobbin and the displacement of the mechanical connecting rod;

[0009] According to the unwinding torque and the friction torque of the damping mechanism, the displacement of the mechanical link when the roll is full and empty is determined when the tension remains unchanged.

[0010] Measure the total thickness of the yarn on the full bobbin and measure the real-time thickness of the yarn on the bobbin during unwinding;

[0011] The real-time adjustment amount of the mechanical connecting rod is calculated by establishing a negatively correlated linear function among the real-time adjustment amount of the mechanical connecting rod, the ratio of the real-time thickness of the yarn on the yarn bobbin to the total thickness during unwinding, and the difference between the displacement amounts of the mechanical connecting rod when the yarn is fully wound and when the yarn is empty.

[0012] The displacement of the mechanical connecting rod is adjusted in real time according to the real-time adjustment amount of the mechanical connecting rod.

[0013] Furthermore, when determining the displacement of the mechanical connecting rod when the winding is full and empty respectively when the tension is constant, the frictional resistance of the damping mechanism to the yarn bobbin when the tension is constant is first calculated:

[0014]

[0015] Among them, F is the friction resistance generated by the damping mechanism and the side wall of the yarn tube, L is the radius of the side wall of the yarn tube, T is the tension on the yarn, and r is the diameter of the real-time winding diameter on the yarn tube. The displacement of the mechanical connecting rod when the winding is full and empty is calculated based on the linear relationship between the displacement of the mechanical connecting rod and the friction resistance of the damping mechanism on the yarn tube.

[0016] Furthermore, in the measurement of the total thickness of the yarn on the fully wound bobbin, the diameter R0 of the yarn bobbin when empty is measured first, and then the diameter R1 of the yarn bobbin when fully wound is measured. The total thickness Y0 of the yarn on the fully wound bobbin is:

[0017]

[0018] Furthermore, in the measurement of the real-time thickness of the yarn on the bobbin, the diameter R0 of the yarn bobbin when it is empty is first measured, and the real-time winding diameter r of the yarn bobbin is measured when it is unwound. The real-time thickness y of the yarn on the bobbin is:

[0019]

[0020] Furthermore, when the real-time adjustment amount of the mechanical connecting rod is calculated, the real-time adjustment amount x of the mechanical connecting rod is:

[0021]

[0022] Among them, x1 is the displacement of the mechanical link when it is empty, and x0 is the displacement of the mechanical link when it is fully wound.

[0023] Furthermore, when the displacement of the mechanical link is adjusted in real time according to the real-time adjustment amount of the mechanical link, a threshold range is set for the real-time adjustment amount of the mechanical link. When the displacement of the mechanical link exceeds the displacement range corresponding to the real-time adjustment amount threshold range, the displacement of the mechanical link is adjusted.

[0024] The present invention also includes a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above method when executing the computer program.

[0025] The present invention also includes a storage medium storing a computer program, which implements the above method when executed by a processor.

[0026] The beneficial effects of the present invention are as follows: the present invention measures the tension on the yarn when the bobbin is fully wound and empty, and determines the displacement of the mechanical connecting rod when the tension remains unchanged according to the change in tension and the friction torque generated by the damping mechanism on the bobbin. Then, through the relationship between the real-time thickness of the yarn on the bobbin and the total thickness during unwinding, a negative linear correlation function with the real-time adjustment amount of the mechanical connecting rod as the variable is established, wherein the ratio of the real-time thickness of the yarn on the bobbin to the total thickness and the ratio of the real-time adjustment amount of the mechanical connecting rod to the difference between the displacement of the mechanical connecting rod when fully wound and empty are negatively linearly correlated. Therefore, during the unwinding process, the real-time adjustment amount of the mechanical connecting rod is determined according to the real-time thickness of the yarn, thereby adjusting the displacement of the mechanical connecting rod in real time to ensure the consistency and stability of the yarn unwinding tension. On the one hand, it reduces tension fluctuations and improves the quality of pultruded products. On the other hand, it improves the level of automation, reduces labor costs, and can be applied to bobbins of different specifications, thereby increasing versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 is a flow chart of the control method of the present invention;

[0029] Figure 2 Schematic diagram of the structure of the computer device in this embodiment. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] like Figure 1 As shown: A method for automatically controlling the tension of a pultrusion creel comprises the following steps:

[0032] Measure the yarn tension when the bobbin is full and empty, and measure the relationship between the friction resistance of the damping mechanism on the bobbin and the displacement of the mechanical connecting rod;

[0033] According to the unwinding torque and the friction torque of the damping mechanism, the displacement of the mechanical link when the roll is full and empty is determined when the tension remains unchanged.

[0034] Measure the total thickness of the yarn on the full bobbin and measure the real-time thickness of the yarn on the bobbin during unwinding;

[0035] The real-time adjustment amount of the mechanical connecting rod is calculated by establishing a negatively correlated linear function among the real-time adjustment amount of the mechanical connecting rod, the ratio of the real-time thickness of the yarn on the yarn bobbin to the total thickness during unwinding, and the difference between the displacement amounts of the mechanical connecting rod when the yarn is fully wound and when the yarn is empty.

[0036] The displacement of the mechanical connecting rod is adjusted in real time according to the real-time adjustment amount of the mechanical connecting rod.

[0037] By measuring the tension on the yarn when the bobbin is full and empty, and according to the change in tension and the friction torque generated by the damping mechanism on the bobbin, the displacement of the mechanical connecting rod when the bobbin is full and empty is determined respectively when the tension remains unchanged. Then, through the relationship between the real-time thickness of the yarn on the bobbin and the total thickness during unwinding, a negative linear correlation function with the real-time adjustment amount of the mechanical connecting rod as the variable is established, wherein the ratio of the real-time thickness of the yarn on the bobbin to the total thickness and the ratio of the real-time adjustment amount of the mechanical connecting rod to the difference between the displacement of the mechanical connecting rod when full and empty are negatively linearly correlated. Therefore, during the unwinding process, the real-time adjustment amount of the mechanical connecting rod is determined according to the real-time thickness of the yarn, thereby adjusting the displacement of the mechanical connecting rod in real time to ensure the consistency and stability of the yarn unwinding tension. On the one hand, it reduces tension fluctuations and improves the quality of pultruded products. On the other hand, it improves the level of automation, reduces labor costs, and can be applied to bobbins of different specifications, increasing versatility.

[0038] In this embodiment, when determining the displacement of the mechanical link when the yarn is full and empty, the frictional resistance of the damping mechanism on the yarn bobbin when the tension is constant is first calculated:

[0039]

[0040] Among them, F is the friction resistance generated by the damping mechanism and the side wall of the yarn tube, L is the radius of the side wall of the yarn tube, T is the tension on the yarn, and r is the diameter of the real-time winding diameter on the yarn tube. The displacement of the mechanical connecting rod when the winding is full and empty is calculated based on the linear relationship between the displacement of the mechanical connecting rod and the friction resistance of the damping mechanism on the yarn tube.

[0041] During the unwinding process, the yarn bobbin can be considered to be in a balanced state. At this time, the unwinding torque is balanced with the friction torque of the damping mechanism. Therefore, if the tension on the yarn is to be kept consistent, the parameter T can be regarded as a constant. At this time, the real-time winding diameter on the yarn bobbin is proportional to the friction resistance, and the friction resistance of the damping mechanism is also proportional to the displacement of the mechanical connecting rod. Therefore, after setting the tension value on the yarn, the tension value is guaranteed to be the set value when the roll is full. After setting the relevant parameters of the damping mechanism and the mechanical connecting rod, the displacement of the mechanical connecting rod when the roll is empty can be calculated.

[0042] Among them, when measuring the total thickness of the yarn on a fully wound bobbin, the diameter R0 of the yarn bobbin when empty is measured first, and then the diameter R1 of the yarn bobbin when fully wound is measured. The total thickness Y0 of the yarn on the fully wound bobbin is:

[0043]

[0044] When measuring the real-time thickness of the yarn on the bobbin, first measure the diameter R0 of the yarn bobbin when it is empty, and then measure the real-time diameter r of the yarn bobbin when it is unwinding. The real-time thickness y of the yarn on the bobbin is:

[0045]

[0046] Finally, according to the negative linear correlation between the ratio of the real-time thickness of the yarn on the bobbin to the total thickness during unwinding and the ratio of the real-time adjustment amount of the mechanical link to the difference between the displacement of the mechanical link between the full roll and the empty roll, the real-time adjustment amount x of the mechanical link is:

[0047]

[0048] Among them, x1 is the displacement of the mechanical link when it is empty, and x0 is the displacement of the mechanical link when it is fully wound.

[0049] During the unwinding process, the real-time adjustment amount of the mechanical connecting rod can be calculated by simply measuring the real-time coil diameter r, which is simple and convenient to operate.

[0050] As a preferred embodiment of the above, when the displacement of the mechanical link is adjusted in real time according to the real-time adjustment amount of the mechanical link, a threshold range is set for the real-time adjustment amount of the mechanical link. When the displacement of the mechanical link exceeds the displacement range corresponding to the real-time adjustment amount threshold range, the displacement of the mechanical link is adjusted.

[0051] Since the yarn bobbin is not a completely regular cylinder in the actual working process, when measuring the real-time winding diameter of the yarn bobbin, the real-time winding diameter may swing back and forth around the mean. At this time, if the displacement is adjusted directly according to the adjustment amount of the mechanical connecting rod, the mechanical connecting rod will also move back and forth repeatedly, resulting in system instability and large tension fluctuations. Therefore, it is necessary to optimize it and set a threshold range for the real-time adjustment amount of the mechanical connecting rod. If the real-time winding diameter fluctuates back and forth within a range, it will not cause the displacement of the mechanical connecting rod to be adjusted. Only when it exceeds this range will the displacement of the mechanical connecting rod be adjusted, thereby reducing the fluctuation of the system and increasing the stability of the tension. This threshold range will change according to the change of the real-time adjustment amount of the mechanical connecting rod.

[0052] See Figure 2 The computer device 400 provided in the embodiment of the present application includes a processor 410 and a memory 420, wherein the memory 420 stores a computer program executable by the processor 410, and when the computer program is executed by the processor 410, the method described above is performed.

[0053] The embodiment of the present application further provides a storage medium 430 , on which a computer program is stored. When the computer program is run by the processor 410 , the above method is executed.

[0054] Among them, the storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, disk or optical disk.

[0055] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0056] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0058] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0059] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection having one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0060] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0061] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0062] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and are not to be construed as limiting the present invention. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for automatically controlling the tension of a pultrusion creel, characterized in that: The steps include: Measure the yarn tension when the bobbin is full and empty, and measure the relationship between the friction resistance of the damping mechanism on the bobbin and the displacement of the mechanical connecting rod; According to the unwinding torque and the friction torque of the damping mechanism, the displacement of the mechanical link when the roll is full and empty is determined when the tension remains unchanged. Measure the total thickness of the yarn on the full bobbin and measure the real-time thickness of the yarn on the bobbin during unwinding; The real-time adjustment amount of the mechanical connecting rod is calculated by establishing a negatively correlated linear function among the real-time adjustment amount of the mechanical connecting rod, the ratio of the real-time thickness of the yarn on the yarn bobbin to the total thickness during unwinding, and the difference between the displacement amounts of the mechanical connecting rod when the yarn is fully wound and when the yarn is empty. Adjusting the displacement of the mechanical connecting rod in real time according to the real-time adjustment amount of the mechanical connecting rod; In measuring the total thickness of the yarn on a fully wound bobbin, the diameter R0 of the yarn bobbin when empty is first measured, and then the diameter R1 of the yarn bobbin when fully wound is measured. The total thickness Y0 of the yarn on the fully wound bobbin is: ； In the measurement of the real-time thickness of the yarn on the bobbin, the diameter R0 of the yarn bobbin when it is empty is first measured, and the real-time diameter r of the yarn bobbin is measured when it is unwound. The real-time thickness y of the yarn on the bobbin is: ； When the real-time adjustment amount of the mechanical connecting rod is calculated, the real-time adjustment amount x of the mechanical connecting rod is: ， Among them, x1 is the displacement of the mechanical link when it is empty, and x0 is the displacement of the mechanical link when it is fully wound.

2. The method for automatically controlling the tension of a pultrusion creel according to claim 1, characterized in that: When determining the displacement of the mechanical connecting rod when the winding is full and empty respectively when the tension is constant, the friction resistance of the damping mechanism on the yarn bobbin when the tension is constant is first calculated: ； Among them, F is the friction resistance generated by the damping mechanism and the side wall of the yarn cone, L is the radius of the yarn cone side wall, T is the tension on the yarn, and r is the real-time diameter of the yarn cone. The displacement of the mechanical connecting rod when the yarn cone is full and empty is calculated based on the linear relationship between the displacement of the mechanical connecting rod and the friction resistance of the damping mechanism on the yarn cone.

3. The method for automatically controlling the tension of a pultrusion creel according to claim 1, characterized in that: When the displacement of the mechanical connecting rod is adjusted in real time according to the real-time adjustment amount of the mechanical connecting rod, a threshold range is set for the real-time adjustment amount of the mechanical connecting rod. When the displacement of the mechanical connecting rod exceeds the displacement range corresponding to the real-time adjustment amount threshold range, the displacement of the mechanical connecting rod is adjusted.

4. A computer device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 3 is implemented.

5. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 3 is implemented.

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