Method and system for measuring and controlling material loss in cable extrusion process

Abstract

The invention discloses a material loss measurement and control method and system in a cable extrusion process, and relates to the technical field of industrial automation control. The method comprises the steps that the material extrusion amount of a current extruder and outer diameter data of a production cable are obtained, the material extrusion amount is obtained based on a high-precision high-speed weighing device, and the outer diameter data are measured by a diameter measuring instrument in real time; calculating a current actual material loss value based on the material extrusion amount and the outer diameter data; and based on the actual material loss value and the outer diameter data, the rotating speed of a screw of the extruder and the traction speed of a traction cable of a traction machine are adjusted, so that the actual material loss value and the outer diameter data are located in the corresponding set ranges respectively. Thus, by introducing a high-precision measuring device and a self-adaptive algorithm, the problem that the proportion of the material extrusion amount to the cable traction speed is not constant due to dependence on manual experience in the prior art is solved, the control precision and stability of the production process and the product quality are remarkably improved, and the production cost and the product quality risk are reduced.

Description

Technical Field

[0001] The present application relates to the field of industrial automation control technology, and in particular to a material loss measurement and control method and system in a cable extrusion process. Background Art

[0002] With the acceleration of the global industrialization process, the cable industry, as the basic support of modern industry, has developed rapidly. Cables are widely used in power transmission, communications, automobile manufacturing, construction and other fields, and the market demand continues to grow. In such an industry background, cable manufacturers are facing fierce market competition. How to reduce production costs while ensuring product quality has become the key to the survival and development of enterprises.

[0003] In the existing cable production technology, material loss control is an important link. Traditional production methods mainly rely on manual experience and equipment stability to control material loss. Operators accumulate experience through long-term practice and adjust production equipment with personal skills and judgment to achieve the purpose of reducing material waste. At the same time, companies will also regularly maintain and service production equipment to ensure the normal operation of the equipment, thereby indirectly controlling material loss.

[0004] However, existing technical solutions rely heavily on manual experience. There are differences in skill levels and experience between different operators, which leads to an inconsistent ratio between the extrusion volume of the material and the pulling speed of the cable, resulting in unstable outer diameter or wall thickness, increasing product quality risks. Summary of the invention

[0005] In view of this, the present application provides a material loss measurement and control method and system in the cable extrusion process, so as to solve the problem that the existing technical solutions are heavily dependent on manual experience, resulting in unstable cable outer diameter or wall thickness.

[0006] On the one hand, an embodiment of the present application provides a method for measuring and controlling material loss in a cable extrusion process, including: obtaining the material extrusion volume of a current extruder and the outer diameter data of the produced cable, wherein the material extrusion volume is obtained based on a high-precision and high-speed weighing device, and the outer diameter data is measured in real time by a diameter gauge; based on the material extrusion volume and the outer diameter data, calculating the current actual material loss value; based on the actual material loss value and the outer diameter data, adjusting the screw speed of the extruder and the traction speed of the traction machine to pull the cable, so that the actual material loss value and the outer diameter data are respectively within the corresponding set ranges.

[0007] On the one hand, an embodiment of the present application provides a material loss measurement and control system during the cable extrusion process, including: a controller, a high-precision and high-speed weighing device, and a diameter gauge; the high-precision and high-speed weighing device is used to detect the material extrusion amount of the current extruder; the diameter gauge is used to detect the outer diameter data of the currently produced cable; the controller is used to obtain the material extrusion amount of the current extruder and the outer diameter data of the produced cable; based on the material extrusion amount and the outer diameter data, the current actual material loss value is calculated; based on the actual material loss value and the outer diameter data, the screw speed of the extruder and the traction speed of the traction machine traction cable are adjusted to make the actual material loss value and the outer diameter data respectively within the corresponding set range.

[0008] In a possible embodiment, the system also includes a display terminal; the display terminal is used to display the material extrusion amount, the extrusion rate corresponding to the material extrusion amount, and the measurement data of the diameter gauge, and display the actual material loss value calculated by the controller.

[0009] In a possible embodiment, the controller is used to: measure the current material loss of the extruder based on a high-precision high-speed weighing device; wherein the high-precision high-speed weighing device is installed at the feed port of the extruder; take the difference between the material loss and the last collected material loss as the material extrusion amount; and, based on a caliper, measure the outer diameter data; wherein the caliper is installed at the outlet of the extruder.

[0010] In one possible embodiment, the controller is used to: calculate the cross-sectional area of ​​the protective layer of the cable based on the outer diameter data; wherein the protective layer is composed of a material; calculate the length of the cable based on the cross-sectional area and the density of the protective layer; and calculate the actual material loss value based on the material extrusion amount and length.

[0011] In a possible embodiment, the controller is used to: based on a first adaptive control algorithm, according to a first deviation between an actual material loss value and a set material loss value, adjust the screw speed and the pulling speed so that the actual material loss value is within the set material loss range; wherein the adaptive parameter of the first adaptive control algorithm is associated with the first deviation; based on a second adaptive control algorithm, according to a second deviation between the outer diameter data and the set outer diameter, adjust the screw speed and the pulling speed so that the outer diameter data is within the set outer diameter range, wherein the adaptive parameter of the second adaptive control algorithm is associated with the second deviation.

[0012] In a possible embodiment, the controller is used to: determine the proportional term, integral term and differential term of the first adaptive control algorithm based on the first deviation, including: obtaining the proportional term based on the product of the first deviation and the proportional gain; multiplying the sum of the first deviation and the historical accumulated deviation by the integral gain to obtain the integral term; determining the material loss deviation change rate based on the first deviation, and multiplying the material loss deviation change rate by the differential gain to obtain the differential term; and adjusting the screw speed and the traction speed according to the sum of the proportional term, the integral term and the differential term.

[0013] In a possible embodiment, the controller is also used to: calculate the extrusion rate corresponding to the material extrusion amount; the extrusion rate represents the material extrusion amount per screw rotation; based on the extrusion rate, obtain the extrusion rate change trend within a preset time period; based on the extrusion rate change trend, determine whether the screw needs maintenance, or, based on the extrusion rate change trend, determine whether the quality of the material has changed.

[0014] The beneficial effects of the present application are as follows: The material loss measurement and control method and system in the cable extrusion process provided by the embodiment of the present application measures the material extrusion amount and the cable outer diameter in real time through a high-precision high-speed weighing device and a diameter gauge, provides an accurate data basis, and controls based on these basic data, avoiding the subjectivity and instability of manual experience, and significantly improving the control accuracy. In addition, the screw speed and traction speed are dynamically adjusted based on these basic data to ensure that the ratio of the material extrusion amount to the cable traction speed is constant. This dynamic adjustment capability enables the system to quickly respond to fluctuations in the production process, maintain the stability of the cable outer diameter and wall thickness, and reduce product quality risks. At the same time, by accurately controlling the material loss and the cable outer diameter, the problem of unstable outer diameter or wall thickness caused by the inconstant ratio is reduced, the consistency and reliability of product quality are improved, and the rework and scrap rate caused by quality problems are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0016] Figure 1 This is a flow chart of an implementation method of a material loss measurement and control method in a cable extrusion process in an embodiment of the present application; Figure 2 This is a schematic diagram of a material loss measurement and control system in a cable extrusion process in an embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. Obviously, the described embodiment is only a part of the embodiment of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other arbitrarily. In addition, although the logical order is shown in the flow chart, in some cases, the steps shown or described can be performed in an order different from that here.

[0018] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0019] The following is a brief introduction to the design concept of the embodiment of the present application: In the existing cable production technology, the control of material loss is an important link. The traditional production method mainly relies on manual experience and the stability of the equipment to control material loss. Operators accumulate experience through long-term practice, and adjust production equipment based on personal skills and judgment in order to achieve the purpose of reducing material waste. At the same time, companies will also regularly maintain and maintain production equipment to ensure the normal operation of the equipment, thereby indirectly controlling material loss. However, the existing technical solutions rely heavily on manual experience, and there are differences in skill levels and experience between different operators, which leads to an inconstant ratio between the extrusion amount of the material and the traction speed of the cable, resulting in unstable outer diameter or wall thickness, increasing product quality risks.

[0020] In view of this, the embodiment of the present application provides a material loss measurement and control method and system in the cable extrusion process, wherein the method includes: obtaining the material extrusion amount of the current extruder and the outer diameter data of the produced cable, wherein the material extrusion amount is obtained based on a high-precision high-speed weighing device, and the outer diameter data is measured in real time by a diameter gauge; based on the material extrusion amount and the outer diameter data, calculating the current actual material loss value; based on the actual material loss value and the outer diameter data, adjusting the screw speed of the extruder and the traction speed of the traction machine to pull the cable, so that the actual material loss value and the outer diameter data are respectively within the corresponding set range. In this way, the technical solution solves the problem of the inconstant ratio of material extrusion amount and cable traction speed caused by relying on manual experience in the prior art by introducing a high-precision measuring device and an adaptive algorithm, significantly improving the control accuracy, stability and product quality of the production process, reducing production costs and product quality risks, and having significant technical effects and application value.

[0021] The preferred embodiments of the present application are described below in conjunction with the drawings in the specification. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In addition, the embodiments and features in the embodiments of the present application may be combined with each other if there is no conflict.

[0022] refer to Figure 1 , which is an implementation flow chart of a material loss measurement and control method in a cable extrusion process provided in an embodiment of the present application. The specific implementation process of the method is as follows: S101, obtaining the material extrusion amount of the current extruder and the outer diameter data of the produced cable, wherein the material extrusion amount is obtained based on a high-precision and high-speed weighing device, and the outer diameter data is measured in real time by a diameter gauge.

[0023] In an embodiment of the present application, the extruder heats solid materials, such as plastics, rubber, etc., to a molten state through heating and shearing, so that they have good fluidity and plasticity. Then, through the rotation of the screw, the molten material is evenly extruded to form a cable protective layer. The extruded material needs to maintain a certain thickness and uniformity to ensure the electrical and mechanical properties of the cable. In the process of extruding the material by the extruder, the speed of the traction machine to pull the cable needs to match the material extrusion rate to make the uniformity of the outer diameter data of the generated cable consistent.

[0024] In an embodiment of the present application, in order to obtain accurate basic data, such as the material extrusion amount and the outer diameter data of the produced cable, the specific acquisition method includes: based on a high-precision high-speed weighing device, measuring the current material loss of the extruder; wherein the high-precision high-speed weighing device is installed at the feed port of the extruder; the difference between the material loss amount and the material loss amount collected last time is used as the material extrusion amount; and, based on a diameter gauge, measuring the outer diameter data; wherein the diameter gauge is installed at the outlet of the extruder, when the material wraps the core of the cable to form a protective layer, thereby forming the cable, the diameter gauge can directly measure the outer diameter of the cable.

[0025] In the above, the material extrusion volume and the outer diameter of the cable are measured in real time through high-precision and high-speed weighing devices and diameter gauges, providing an accurate data basis. Subsequent control is based on these basic data, avoiding the subjectivity and instability of manual experience and significantly improving control accuracy.

[0026] S102, calculating the current actual material loss value based on the material extrusion volume and outer diameter data.

[0027] In the embodiment of the present application, in order to make the speed of the traction machine pulling the cable match the material extrusion rate, and the final generated cable outer diameter meets the set specifications, it is necessary to control the actual material loss value in the cable production process to prevent the deviation between the actual material loss value and the set material loss value from being too large. The calculation method of the actual material loss value is as follows: First, based on the outer diameter data, the cross-sectional area of ​​the cable's protective layer is calculated, where the protective layer is composed of materials. If the outer diameter data of the cable is measured in real time by a diameter gauge H , the wire core inner diameter data corresponding to the cable specification is h , then the cross-sectional area of ​​the protective layer A It can be calculated by the following formula: ; In formula (1), π is the circumference of a circle, which is approximately equal to 3.14159.

[0028] Then, the length of the cable is calculated based on the cross-sectional area of ​​the protective layer and the density of the protective layer. Specifically, if the density of the protective layer is ρ , then the length of the cable L It can be calculated by the following formula: ; In formula (2), Q is the material extrusion volume of the extruder.

[0029] Finally, the actual material loss value is calculated based on the material extrusion volume and length. Specifically, the actual material loss value M loss It can be calculated by the following formula: Through the above method, the actual material loss value of the cable under the current outer diameter data and material extrusion amount can be calculated, providing a reference and basis for subsequent material loss control.

[0030] S103, based on the actual material loss value and the outer diameter data, adjusting the screw speed of the extruder and the traction speed of the traction cable of the traction machine so that the actual material loss value and the outer diameter data are respectively within the corresponding set ranges.

[0031] In an embodiment of the present application, after the actual material loss value of the cable is calculated, the screw speed of the extruder and the traction speed of the traction machine for pulling the cable are further adjusted based on the actual material loss value and the outer diameter data, including: based on the first adaptive control algorithm, according to the first deviation between the actual material loss value and the set material loss value, the screw speed and the traction speed are adjusted so that the actual material loss value is within the set material loss range; wherein the adaptive parameters of the first adaptive control algorithm are associated with the first deviation.

[0032] Specifically, firstly, based on the first deviation, the proportional term, the integral term and the differential term of the first adaptive control algorithm are determined, specifically including: firstly, based on the product of the first deviation and the proportional gain, the proportional term is obtained, and the specific calculation formula is as follows: ; In formula (4), ∆M is the current first deviation, K p is the proportional gain, P is a proportional term.

[0033] Then, the sum of the current first deviation and the historical accumulated deviation is multiplied by the integral gain to obtain the integral term. The specific calculation formula is as follows: ; In formula (5), I is the integral term, K i is the integral gain, t is the number of historical calculations of the first deviation, i is the number of first deviation history calculations.

[0034] Next, the material loss deviation change rate is determined based on the first deviation, and the material loss deviation change rate is multiplied by the differential gain to obtain the differential term. The specific calculation formula is as follows: ; In formula (6), D is the differential term, K d is the differential gain, ∆ M p is the first deviation obtained last time, ∆ T is the time interval between two deviations.

[0035] Further, find the sum of the proportional term, integral term, and differential term u ( t ), the specific calculation formula is as follows: .

[0036] Further, according to the sum u ( t ), respectively adjust the screw speed and traction speed, the specific adjustment formula is: ; In formula (8), ω screw is the screw speed, ω screw,0 is the initial screw speed.

[0037] In formula (9), V towing is the pulling speed, V towing,0 is the initial pulling speed.

[0038] Through the above-mentioned first adaptive control algorithm, real-time control of material loss can be achieved. Among them, the first adaptive control algorithm can quickly respond to dynamic changes in the production process by adjusting the control parameters in real time, ensuring the real-time control, while the control parameters of the traditional PID algorithm are fixed and cannot be adjusted in real time, and the response to dynamic changes is slow. Secondly, the first adaptive control algorithm can better adapt to different production conditions and material characteristics by dynamically adjusting the control parameters, and improve the reliability and stability of control, while the traditional PID algorithm has fixed control parameters, poor adaptability to changes in production conditions and material characteristics, and is prone to unstable control. In addition, the first adaptive control algorithm can achieve more precise control and reduce overshoot and steady-state errors by adjusting the control parameters in real time, while the control accuracy of the traditional PID algorithm is limited by fixed parameters, which is prone to overshoot and steady-state errors.

[0039] In one embodiment, based on the actual material loss value and the outer diameter data, the screw speed of the extruder and the traction speed of the traction cable of the traction machine are adjusted, and it also includes: based on the second adaptive control algorithm, according to the second deviation between the outer diameter data and the set outer diameter, the screw speed and the traction speed are adjusted so that the outer diameter data is within the set outer diameter range, wherein the adaptive parameters of the second adaptive control algorithm are associated with the second deviation.

[0040] Among them, the implementation process of the second adaptive control algorithm can refer to the first adaptive control algorithm, and its principle is the same, except that the dynamic control parameter of the second adaptive control algorithm is based on the second deviation between the outer diameter data and the set outer diameter, while the dynamic control parameter of the first adaptive control algorithm is based on the first deviation between the actual material loss value and the set material loss value. Therefore, the implementation process of the second control algorithm will not be repeated here, and the technical effect achieved by it can refer to the technical effect of the above-mentioned first control algorithm. The corresponding calculation formula only needs to adaptively replace the second deviation with the first deviation.

[0041] In one embodiment, the extrusion rate corresponding to the material extrusion amount can also be calculated, and the extrusion rate represents the material extrusion amount per screw rotation; then, based on the extrusion rate, the extrusion rate change trend within a preset time period is obtained; further, based on the extrusion rate change trend, it is determined whether the screw needs maintenance, or, based on the extrusion rate change trend, it is determined whether the quality of the material has changed.

[0042] In this embodiment, the size of the extrusion rate reflects the extrusion capacity of the extruder, and the fluctuation of the extrusion rate reflects the fluctuation of the outer diameter data of the cable during the production process. Therefore, the change trend of the extrusion rate during long-term operation and the fluctuation during the speed increase and decrease process can be used as quantitative data for the maintenance of the equipment screw and barrel. At the same time, the fluctuation of the extrusion rate will vary for different materials, and then the quality of the material can be quantitatively judged.

[0043] To summarize, the embodiments of the present application provide a method and system for measuring and controlling material loss in a cable extrusion process. By introducing a high-precision measuring device and an adaptive algorithm, the problem of the non-constant ratio of material extrusion amount to cable pulling speed caused by reliance on manual experience in the prior art is solved. The control accuracy, stability and product quality of the production process are significantly improved, the production cost and product quality risk are reduced, and the system has significant technical effects and application value.

[0044] In addition, this technical solution not only performs dual closed-loop control from the two perspectives of actual material loss value and outer diameter data to achieve real-time control of material loss, but also adjusts the control parameters in real time through the above-mentioned first adaptive control algorithm and second adaptive control algorithm, so that the material loss control can quickly respond to dynamic changes in the production process. Compared with the fixed control parameters of the traditional PID algorithm, this method responds faster to dynamic changes, can better adapt to different production conditions and material characteristics, improve the reliability and stability of control, and can also achieve more precise control and reduce overshoot and steady-state errors.

[0045] Based on the same inventive concept, the embodiment of the present application also provides a material loss measurement and control system in the cable extrusion process. Figure 2 As shown, it is a schematic diagram of a material loss measurement and control system 200 during the cable extrusion process, which may include: a controller 201, a high-precision high-speed weighing device 202, and a diameter gauge 203; the high-precision high-speed weighing device 202 is used to detect the material extrusion amount of the current extruder; the diameter gauge 203 is used to detect the outer diameter data of the current produced cable; the controller 201 is used to obtain the material extrusion amount of the current extruder and the outer diameter data of the produced cable; based on the material extrusion amount and the outer diameter data, calculate the current actual material loss value; based on the actual material loss value and the outer diameter data, adjust the screw speed of the extruder and the traction speed of the traction machine to pull the cable, so that the actual material loss value and the outer diameter data are respectively within the corresponding set ranges.

[0046] In a possible embodiment, the system also includes a display terminal; the display terminal is used to display the material extrusion amount, the extrusion rate corresponding to the material extrusion amount, and the measurement data of the diameter gauge 203, and display the actual material loss value calculated by the controller.

[0047] In this embodiment, the user can also set the corresponding "high-speed line speed" and "low-speed line speed" production modes based on the display terminal according to the production specifications, and set the corresponding "target outer diameter value" according to the process requirements of the cable. During the production process, the production line can be switched between the "high-speed line speed" and "low-speed line speed" production states according to the actual situation of the production process, and the controller will ensure the stability of the wire diameter control throughout the process. In addition, the display terminal can also display the traction speed, screw speed, extrusion volume, extrusion rate, material loss value and outer diameter value that the user is concerned about.

[0048] In a possible embodiment, the controller 201 is used to: measure the current material loss of the extruder based on the high-precision high-speed weighing device 202; wherein the high-precision high-speed weighing device 202 is installed at the feed port of the extruder; take the difference between the material loss and the material loss collected last time as the material extrusion amount; and, based on the caliper 203, measure the outer diameter data; wherein the caliper 203 is installed at the outlet of the extruder.

[0049] In a possible embodiment, the controller 201 is used to: calculate the cross-sectional area of ​​the protective layer of the cable based on the outer diameter data; wherein the protective layer is composed of a material; calculate the length of the cable based on the cross-sectional area and the density of the protective layer; and calculate the actual material loss value based on the material extrusion amount and length.

[0050] In a possible embodiment, the controller 201 is used to: based on a first adaptive control algorithm, according to a first deviation between an actual material loss value and a set material loss value, adjust the screw speed and the pulling speed so that the actual material loss value is within the set material loss range; wherein the adaptive parameter of the first adaptive control algorithm is associated with the first deviation; based on a second adaptive control algorithm, according to a second deviation between the outer diameter data and the set outer diameter, adjust the screw speed and the pulling speed so that the outer diameter data is within the set outer diameter range, wherein the adaptive parameter of the second adaptive control algorithm is associated with the second deviation.

[0051] In a possible embodiment, the controller 201 is used to: determine the proportional term, integral term and differential term of the first adaptive control algorithm based on the first deviation, including: obtaining the proportional term based on the product of the first deviation and the proportional gain; multiplying the sum of the first deviation and the historical accumulated deviation by the integral gain to obtain the integral term; determining the material loss deviation change rate based on the first deviation, and multiplying the material loss deviation change rate by the differential gain to obtain the differential term; and adjusting the screw speed and the traction speed according to the sum of the proportional term, the integral term and the differential term.

[0052] In a possible embodiment, the controller 201 is also used to: calculate the extrusion rate corresponding to the material extrusion amount; the extrusion rate represents the material extrusion amount per screw rotation; based on the extrusion rate, obtain the extrusion rate change trend within a preset time period; based on the extrusion rate change trend, determine whether the screw needs maintenance, or, based on the extrusion rate change trend, determine whether the quality of the material has changed.

[0053] In some possible implementations, a material loss measurement and control system in a cable extrusion process according to the present application may include at least a processor and a memory. The memory stores program code, and when the program code is executed by the processor, the processor executes the steps of the material loss measurement and control method in a cable extrusion process according to various exemplary embodiments of the present application described in this specification. For example, the processor may execute the following steps: Figure 1 Follow the steps shown in .

[0054] In some possible embodiments, various aspects of the material loss measurement and control method in the cable extrusion process provided in the present application can also be implemented in the form of a program product, which includes a program code. When the program product is run on an apparatus, the program code is used to enable the control device to execute the steps of the material loss measurement and control method in the cable extrusion process according to various exemplary embodiments of the present application described above in this specification.

[0055] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for measuring and controlling material loss during cable extrusion, characterized in that: include: Obtain the material extrusion amount of the current extruder and the outer diameter data of the produced cable, wherein the material extrusion amount is obtained based on a high-precision high-speed weighing device, and the outer diameter data is measured in real time by a diameter gauge; calculate the current actual material loss value based on the material extrusion amount and the outer diameter data; adjust the screw speed of the extruder and the traction speed of the traction machine traction cable based on the actual material loss value and the outer diameter data, so that the actual material loss value and the outer diameter data are respectively within the corresponding set ranges.

2. The method according to claim 1, characterized in that: The method of obtaining the material extrusion amount of the current extruder and the outer diameter data of the produced cable includes: based on the high-precision and high-speed weighing device, measuring the current material loss of the extruder; wherein the high-precision and high-speed weighing device is installed at the feed port of the extruder; taking the difference between the material loss and the material loss collected last time as the material extrusion amount; and, based on the diameter gauge, measuring the outer diameter data; wherein the diameter gauge is installed at the outlet of the extruder.

3. The method according to claim 1, characterized in that: The calculating of the current actual material loss value based on the material extrusion amount and the outer diameter data comprises: calculating the cross-sectional area of ​​the protective layer of the cable based on the outer diameter data; wherein the protective layer is composed of the material; calculating the length of the cable based on the cross-sectional area and the density of the protective layer; and calculating the actual material loss value based on the material extrusion amount and the length.

4. The method according to claim 1, characterized in that: The method of adjusting the screw speed of the extruder and the traction speed of the traction cable of the traction machine based on the actual material loss value and the outer diameter data includes: based on a first adaptive control algorithm, according to a first deviation between the actual material loss value and the set material loss value, adjusting the screw speed and the traction speed so that the actual material loss value is within the set material loss range; wherein the adaptive parameter of the first adaptive control algorithm is associated with the first deviation; based on a second adaptive control algorithm, according to a second deviation between the outer diameter data and the set outer diameter, adjusting the screw speed and the traction speed so that the outer diameter data is within the set outer diameter range, wherein the adaptive parameter of the second adaptive control algorithm is associated with the second deviation.

5. The method according to claim 4, characterized in that: The method of adjusting the screw rotation speed and the traction speed according to the first deviation between the actual material loss value and the set material loss value includes: determining the proportional term, integral term and differential term of the first adaptive control algorithm based on the first deviation, including: obtaining the proportional term based on the product of the first deviation and the proportional gain; multiplying the sum of the first deviation and the historical accumulated deviation by the integral gain to obtain the integral term; determining the material loss deviation change rate based on the first deviation, and multiplying the material loss deviation change rate by the differential gain to obtain the differential term; and adjusting the screw rotation speed and the traction speed respectively according to the sum of the proportional term, the integral term and the differential term.

6. The method according to claim 1, characterized in that: Also includes: Calculate the extrusion rate corresponding to the material extrusion amount; the extrusion rate represents the material extrusion amount per rotation of the screw; Based on the extrusion rate, the extrusion rate variation trend within a preset time period is obtained; based on the extrusion rate variation trend, whether the screw needs maintenance is determined, or, based on the extrusion rate variation trend, whether the quality of the material has changed is determined.

7. A material loss measurement and control system in the cable extrusion process, characterized in that: include: A controller, a high-precision high-speed weighing device, and a diameter gauge; the high-precision high-speed weighing device is used to detect the material extrusion amount of the current extruder; the diameter gauge is used to detect the outer diameter data of the current produced cable; the controller is used to obtain the material extrusion amount of the current extruder and the outer diameter data of the produced cable; based on the material extrusion amount and the outer diameter data, the current actual material loss value is calculated; based on the actual material loss value and the outer diameter data, the screw speed of the extruder and the traction speed of the traction machine traction cable are adjusted to make the actual material loss value and the outer diameter data respectively within the corresponding set range.

8. The system according to claim 7, characterized in that: It also includes a display terminal; the display terminal is used to display the material extrusion amount, the extrusion rate corresponding to the material extrusion amount, and the measurement data of the diameter gauge, and display the actual material loss value calculated by the controller.

9. The system according to claim 7, characterized in that: The controller is used to: calculate the cross-sectional area of ​​the protective layer of the cable based on the outer diameter data; wherein the protective layer is composed of the material; calculate the length of the cable based on the cross-sectional area and the density of the protective layer; and calculate the actual material loss value based on the material extrusion amount and the length.

10. The system according to claim 7, characterized in that: The controller is used to: based on a first adaptive control algorithm, according to a first deviation between an actual material loss value and a set material loss value, adjust the screw speed and the pulling speed so that the actual material loss value is within the set material loss range; wherein the adaptive parameter of the first adaptive control algorithm is associated with the first deviation; based on a second adaptive control algorithm, according to a second deviation between the outer diameter data and the set outer diameter, adjust the screw speed and the pulling speed so that the outer diameter data is within the set outer diameter range, wherein the adaptive parameter of the second adaptive control algorithm is associated with the second deviation.

Images