Method of heating control, heating system, apparatus and medium for a multi-channel extrusion barrel

Abstract

The application provides a heating control method, a heating system, a device and a medium of a multi-channel extrusion cylinder, and belongs to the technical field of metal extrusion forming. The multi-channel extrusion cylinder comprises an outer cylinder and an inner cylinder sleeved in the outer cylinder, an array of extrusion holes is arranged in the inner cylinder in the axial direction, a plurality of mounting holes are arranged around the outer periphery of the inner cylinder in the circumferential direction, and a plurality of electric heating pipes are arranged in the plurality of mounting holes correspondingly; the heating control method comprises the following steps: obtaining an actual temperature of the inner cylinder and an actual surface temperature of a target electric heating pipe, the target electric heating pipe being one electric heating pipe arranged in a region with the fastest heating temperature rise in the inner cylinder; determining an initial control output according to the actual temperature of the inner cylinder and a preset target temperature; reasonably constraining the initial control output according to the actual surface temperature of the target electric heating pipe to determine a target control output; and controlling a power regulator to adjust the power of the plurality of electric heating pipes according to the target control output. The application can prolong the service life of the multi-channel extrusion cylinder.

Description

Technical Field

[0001] This application relates to the field of metal extrusion molding technology, and in particular to heating control methods, heating systems, equipment and media for multi-channel extrusion cylinders. Background Technology

[0002] In the prior art, the heating strategy for multi-channel extrusion cylinders usually involves first arranging electric heating tubes axially in the outer cylinder, and then adjusting the power of the electric heating tubes. However, this heating strategy has at least the following drawbacks: Firstly, since the inner and outer cylinders of a multi-channel extrusion cylinder are usually fitted with an interference fit, when the electric heating element is placed on the outer cylinder, the interference force between the inner and outer cylinders is easily reduced or even eliminated due to the thermal expansion of the outer cylinder. The reduction of the interference force will weaken the prestress of the inner cylinder, thereby reducing the inner cylinder's ability to resist extrusion pressure and affecting the life and safety of the multi-channel extrusion cylinder. In addition, the interference fit between the inner and outer cylinders will cause the outer cylinder to bear greater stress, thereby generating local tensile stress concentration at the mounting hole of the electric heating element, increasing the risk of cracking of the outer cylinder. Secondly, when adjusting the power of the electric heating tubes arranged in the outer cylinder, the measured temperature of the outer cylinder is usually used as the only feedback quantity, without taking into account the temperature limit of the electric heating tubes themselves. In order to achieve rapid heating of the cylinder or compensate for heat loss, it is usually necessary to increase the power of the electric heating tubes. However, excessively high surface temperature of the electric heating tubes can cause the cylinder material around the electric heating tubes to soften or generate thermal fatigue cracks, thereby reducing the service life of the multi-channel extrusion cylinder. Summary of the Invention

[0003] The main purpose of this application is to propose a heating control method, heating system, equipment and medium for a multi-channel extrusion cylinder, with the aim of extending the service life of the multi-channel extrusion cylinder.

[0004] To achieve the above objectives, one aspect of this application proposes a heating control method for a multi-channel extrusion cylinder. The multi-channel extrusion cylinder includes an outer cylinder and an inner cylinder sleeved within the outer cylinder. An array of extrusion holes and multiple mounting holes are axially formed in the inner cylinder. The multiple mounting holes are arranged circumferentially around the outer periphery of the array of extrusion holes, and multiple electric heating tubes are correspondingly disposed within each of the multiple mounting holes. The heating control method includes: The actual temperature of the inner cylinder and the actual surface temperature of the target electric heating tube are obtained. The target electric heating tube is an electric heating tube set in the region of the inner cylinder where the temperature rises the fastest. The initial control output is determined based on the actual temperature of the inner cylinder and the preset target temperature. Based on the actual surface temperature of the target electric heating tube, the initial control output is reasonably constrained to determine the target control output. Based on the target control output, the power regulator adjusts the power of the plurality of electric heating tubes.

[0005] Furthermore, the step of applying reasonable constraints to the initial control output based on the actual surface temperature of the target electric heating tube to determine the target control output includes: The adjustment coefficient is determined based on the relationship between the actual surface temperature of the target electric heating tube and the preset tube temperature threshold. The target control output is obtained by multiplying the initial control output by the adjustment coefficient.

[0006] Further, the preset tube temperature threshold includes a first tube temperature threshold and a second tube temperature threshold, wherein the first tube temperature threshold is less than the second tube temperature threshold; determining the adjustment coefficient based on the relationship between the actual surface temperature of the target electric heating tube and the preset tube temperature threshold includes: When the actual surface temperature of the target electric heating tube is less than or equal to the first tube temperature threshold, the adjustment coefficient is determined to be the first preset coefficient; When the actual surface temperature of the target electric heating tube is greater than or equal to the second tube temperature threshold, the adjustment coefficient is determined to be the second preset coefficient; When the actual surface temperature of the target electric heating tube is greater than the first tube temperature threshold but less than the second tube temperature threshold, the first preset coefficient is lowered according to the actual surface temperature of the target electric heating tube to obtain the adjustment coefficient, and the adjustment coefficient is greater than the second preset coefficient.

[0007] Further, the first preset coefficient is set to 1, and the second preset coefficient is set to 0; the adjustment coefficient is obtained by lowering the first preset coefficient according to the actual surface temperature of the target electric heating tube, including: The first difference is obtained by subtracting the actual surface temperature of the target electric heating tube from the first tube temperature threshold; and the second difference is obtained by subtracting the second tube temperature threshold from the first tube temperature threshold. Calculate the ratio between the first difference and the second difference, and then subtract the ratio from the first preset coefficient to obtain the adjustment coefficient.

[0008] To achieve the above objectives, another aspect of this application proposes a heating system for a multi-channel extrusion cylinder. The multi-channel extrusion cylinder includes an outer cylinder and an inner cylinder sleeved within the outer cylinder. An array of extrusion holes and a plurality of mounting holes are axially formed in the inner cylinder, and the plurality of mounting holes are arranged circumferentially around the outer periphery of the array of extrusion holes. The heating system includes a plurality of electric heating tubes, a power regulator, and a control module, and the plurality of electric heating tubes are correspondingly disposed within the plurality of mounting holes. The power input terminals of the plurality of electric heating tubes are connected to the power output terminals of the power regulator, the power input terminals of the power regulator are connected to an external power supply, and the control input terminals of the power regulator are connected to the first output terminal of the control module. The control module is used to implement the above-described heating control method.

[0009] Furthermore, the heating system also includes a first temperature sensor and a second temperature sensor; The output terminal of the first temperature sensor is connected to the first input terminal of the control module. The first temperature sensor is used to collect the actual temperature of the inner cylinder and send it to the control module. The output terminal of the second temperature sensor is connected to the second input terminal of the control module. The second temperature sensor is used to collect the actual surface temperature of the target electric heating tube and send it to the control module.

[0010] Furthermore, the heating system also includes a conductive component disposed on the rear end face of the multi-channel extrusion cylinder; The input terminal of the conductive component is connected to the power output terminal of the power regulator, and the output terminal of the conductive component is connected to the power input terminal of the plurality of electric heating tubes.

[0011] Furthermore, the heating system also includes a switch module, which is connected in series on the power supply line between the power regulator and the external power supply, and the control terminal of the switch module is connected to the second output terminal of the control module; The control module is also used to: acquire and detect the surface temperature of the target electric heating tube in real time; if the surface temperature of the target electric heating tube is detected to be greater than the preset tube temperature limit alarm value, control the switch module to turn off to cut off the power supply line and issue an over-temperature alarm.

[0012] To achieve the above objectives, another aspect of this application proposes an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above-described heating control method.

[0013] To achieve the above objectives, another aspect of this application proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described heating control method.

[0014] This application includes at least the following beneficial effects: By opening multiple mounting holes axially in the inner cylinder of the multi-channel extrusion cylinder and correspondingly arranging multiple electric heating tubes in the mounting holes, the temperature of the inner cylinder can be higher than that of the outer cylinder, which is beneficial to maintaining or even enhancing the interference force between the inner and outer cylinders, thereby enhancing the prestress of the inner cylinder, improving the inner cylinder's ability to withstand extrusion pressure, and reducing the risk of cracking of the outer cylinder; By opening an array of extrusion holes axially in the inner cylinder of the multi-channel extrusion cylinder and constraining multiple mounting holes to be arranged circumferentially around the outer periphery of the extrusion hole array, the temperature difference around each extrusion hole can be minimized when multiple electric heating tubes are heated with the same power, that is, the temperature uniformity is improved, which is beneficial to improving the forming quality and production efficiency of multi-channel extrusion of metal profiles. By first obtaining the actual temperature of the inner cylinder and the actual surface temperature of the target electric heating tube (which is a heating tube located in the area of ​​the fastest temperature rise in the inner cylinder), the initial control output is determined based on the actual temperature of the inner cylinder and the preset target temperature. Then, the initial control output is reasonably constrained based on the actual surface temperature of the target electric heating tube. Subsequently, the power regulator is used to adjust the power of multiple electric heating tubes based on the target control output determined by the reasonable constraints. This can reduce the risk of damage to the cylinder due to overheating of the electric heating tubes, thereby extending the service life of the multi-channel extrusion cylinder. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the rear end face of the multi-channel extrusion cylinder provided in the embodiments of this application; Figure 2 This is a schematic flowchart of the heating control method for a multi-channel extrusion cylinder provided in the embodiments of this application; Figure 3 This is a schematic diagram of the front end of a multi-channel extrusion cylinder that embodies the inner cylinder partitioning provided in an embodiment of this application; Figure 4 This is a schematic diagram of the rear end face of a multi-channel extrusion cylinder that embodies the inner cylinder partitioning provided in an embodiment of this application; Figure 5 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit it. In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this application; they are merely examples of systems and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0017] It is understood that the terms “first,” “second,” etc., used in this application may be used herein to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms. These terms are only used to distinguish one concept from another. For example, without departing from the scope of the embodiments of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the words “if,” “when,” or “in response to a determination” as used herein may be interpreted as “when…” or “when…” or “in response to a determination.”

[0018] As used in this application, the terms "at least one", "multiple", "each", "any", etc., "at least one" includes one, two or more, "multiple" includes two or more, "each" refers to each of the corresponding multiples, and "any" refers to any one of the multiples.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0020] Multi-channel extrusion is an extrusion technology that has been developed in recent years. In existing technologies, the heating strategy for multi-channel extrusion cylinders usually involves first arranging electric heating tubes axially in the outer cylinder, and then adjusting the power of the electric heating tubes. However, this heating strategy has at least the following implementation defects: Firstly, since the outer and inner cylinders of a multi-channel extrusion cylinder typically use an interference fit to increase the prestress of the inner cylinder (which can be understood as circumferential compressive stress), enhancing its ability to withstand extrusion pressure, when the electric heating element is placed on the outer cylinder, the outer cylinder is directly heated to a high temperature, which can easily lead to thermal expansion. This reduces or even eliminates the interference force between the inner and outer cylinders. Furthermore, the outer cylinder is prone to creep at high temperatures, which further reduces the interference force between the inner and outer cylinders. The reduction in interference force weakens the prestress of the inner cylinder, thereby reducing its ability to resist extrusion pressure and affecting the lifespan and safety of the multi-channel extrusion cylinder. In addition, the interference fit between the inner and outer cylinders causes the outer cylinder to bear greater stress, resulting in localized tensile stress concentration at the mounting holes of the electric heating element, increasing the risk of cracking of the outer cylinder. Secondly, when adjusting the power of the electric heating tubes arranged in the outer cylinder, the measured temperature of the outer cylinder is usually used as the only feedback quantity for on / off or PID (Proportional-Integral-Derivative) control. The temperature limit of the electric heating tubes themselves is not taken into account. When the thermal inertia of the cylinder is large, the cylinder temperature overshoot phenomenon is prone to occur. In order to achieve rapid heating of the cylinder or compensate for heat loss, it is usually necessary to increase the power of the electric heating tubes. However, if the surface temperature of the electric heating tubes is too high, the cylinder material around the electric heating tubes will soften or generate thermal fatigue cracks, thereby reducing the service life of the multi-channel extrusion cylinder.

[0021] In addition, when there are a large number of electric heating tubes arranged inside the outer cylinder of a multi-channel extrusion cylinder, a simple zoning control method is generally adopted. For example, the outer cylinder is simply divided into at least two sections along the axial or circumferential direction, and the power of the electric heating tubes in each section is adjusted. This fails to perform fine temperature control for the multi-channel structure and makes it difficult to eliminate the temperature difference between the axial and circumferential directions.

[0022] In view of this, embodiments of this application provide a heating control method, heating system, equipment, and medium for a multi-channel extrusion cylinder. This solution, by opening multiple mounting holes axially in the inner cylinder of the multi-channel extrusion cylinder and correspondingly arranging multiple electric heating tubes in the mounting holes, can make the temperature of the inner cylinder higher than that of the outer cylinder. This is beneficial for maintaining or even enhancing the interference force between the inner and outer cylinders, thereby enhancing the prestress of the inner cylinder, improving the inner cylinder's ability to withstand extrusion pressure, and reducing the risk of cracking of the outer cylinder. By opening an array of extrusion holes axially in the inner cylinder of the multi-channel extrusion cylinder and constraining the multiple mounting holes to be arranged circumferentially around the outer periphery of the extrusion hole array, the temperature difference around each extrusion hole can be minimized when the multiple electric heating tubes are heated with the same power, that is, the temperature uniformity is improved, which is beneficial for improving the forming quality and production efficiency of multi-channel extrusion of metal profiles. By first obtaining the actual temperature of the inner cylinder and the actual surface temperature of the target electric heating tube (which is a heating tube located in the area of ​​the fastest temperature rise in the inner cylinder), the initial control output is determined based on the actual temperature of the inner cylinder and the preset target temperature. Then, the initial control output is reasonably constrained based on the actual surface temperature of the target electric heating tube. Subsequently, the power regulator is used to adjust the power of multiple electric heating tubes based on the target control output determined by the reasonable constraints. This can achieve effective control of the cylinder temperature and reduce the risk of damage to the cylinder due to overheating of the electric heating tubes, thereby extending the service life of the multi-channel extrusion cylinder.

[0023] This application provides a heating control method for a multi-channel extrusion cylinder, relating to the field of metal extrusion molding technology. It can be applied to terminals, servers, or software running on either a terminal or server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, etc., but is not limited to these. The server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The server can also be a node server in a blockchain network. The software can be an application implementing the above method, but is not limited to these forms.

[0024] This application provides a multi-channel extrusion cylinder, which can be a metal multi-channel extrusion cylinder, mainly used for producing ultra-wide aluminum profiles. The multi-channel extrusion cylinder includes an outer cylinder 100 and an inner cylinder 110 sleeved within the outer cylinder 100. Under normal circumstances, the inner cylinder 110 is detachably sleeved within the outer cylinder 100. It can be understood that the multi-channel extrusion cylinder consists of two layers. An array of extrusion holes and multiple mounting holes 111 are axially formed in the inner cylinder 110, and the multiple mounting holes 111 are arranged circumferentially around the outer periphery of the extrusion hole array. The extrusion hole array includes at least two extrusion holes 112, which are arranged horizontally side-by-side. (See also...) Figure 1 As shown. In actual use of this multi-channel extrusion cylinder, multiple electric heating tubes are correspondingly installed in multiple mounting holes 111, that is, one electric heating tube is installed in each mounting hole 111. Each electric heating tube can be a metal electric heating tube with a diameter of 25mm and a rated maximum power of 4kW. At least two extrusion holes 112 are used to simultaneously extrude at least two aluminum profile bars under heated conditions. It should be noted that the multiple electric heating tubes are limited to being arranged circumferentially around the outer periphery of the extrusion hole array, which was determined in advance by technicians based on thermal steady-state simulation experiments.

[0025] By placing the electric heating element in the inner cylinder, the thermal expansion of the inner cylinder is greater than that of the outer cylinder. This maintains or even enhances the interference force between the inner and outer cylinders, and reduces the creep of the outer cylinder as its temperature decreases. This enhances the circumferential compressive stress of the inner cylinder, improving its ability to withstand extrusion pressure and extending the service life of the multi-channel extrusion cylinder. Since there is no need to create mounting holes for the electric heating element in the outer cylinder, the problem of tensile stress concentration at the hole edge caused by the interference fit between the inner and outer cylinders under high stress is eliminated. This effectively reduces the risk of the outer cylinder cracking at the mounting holes of the electric heating element during extrusion, thereby improving the overall structural reliability and service life of the multi-channel extrusion cylinder. Optimizing the placement of the electric heating element in the inner cylinder improves the temperature uniformity around each extrusion hole, making the metal flow rate in each extrusion hole as consistent as possible during multi-channel extrusion. This reduces the probability of defects such as bending, twisting, and uneven wall thickness in the profile, thereby improving the yield and production efficiency of multi-channel metal profile extrusion.

[0026] Please see Figure 2 , Figure 2 This is an optional flowchart illustrating the heating control method for the multi-channel extrusion cylinder provided in this application embodiment. The method may include, but is not limited to, the following steps S201 to S204: Step S201: Obtain the actual temperature of the inner cylinder and the actual surface temperature of the target electric heating tube. The target electric heating tube is an electric heating tube set in the area where the heating temperature rises the fastest in the inner cylinder. Step S202: Determine the initial control output based on the actual temperature of the inner cylinder and the preset target temperature; Step S203: Based on the actual surface temperature of the target electric heating tube, apply reasonable constraints to the initial control output to determine the target control output; Step S204: According to the target control output, control the power regulator to adjust the power of multiple electric heating tubes.

[0027] Steps S201 to S204 of the embodiments of this application, which determine the initial control output based on the temperature analysis of the inner cylinder, are constrained and adjusted based on the surface temperature of the electric heating tube before being applied to the power regulation operation. This ensures that the surface temperature of the electric heating tube is always within a safe range, reducing the risk of damage to the cylinder due to overheating of the electric heating tube, thereby extending the service life of the multi-channel extrusion cylinder.

[0028] In step S201 of some embodiments, the area with the fastest temperature rise in the inner cylinder can be a target area that is pre-defined by technicians through a real physical experiment. The real physical experiment process may include: when the inner cylinder is unloaded, controlling multiple electric heating tubes installed in the inner cylinder to run at the same preset power for a period of time, collecting the temperature around each mounting hole at a preset sampling interval during the operation and forming a temperature-time curve corresponding to each mounting hole, and then performing temperature change trend analysis on the multiple temperature-time curves corresponding to multiple mounting holes to delineate the target area from the inner cylinder, and under normal circumstances, the target area contains only one electric heating tube.

[0029] In step S202 of some embodiments, determining the initial control output based on the actual temperature of the inner cylinder and the preset target temperature may include: first subtracting the preset target temperature of the inner cylinder from the actual temperature to obtain the temperature deviation of the inner cylinder, wherein the preset target temperature of the inner cylinder is preferably 480°C; then using an existing PID control strategy to analyze the temperature deviation of the inner cylinder to determine the initial control output, wherein the value range of the initial control output is [0%, 100%], which can be understood as a power percentage instruction, mainly used to constrain the output power of each electric heating element. That is, when the initial control output is X%, it means that the output power of each electric heating element needs to be adjusted to X% of its rated maximum power.

[0030] In step S203 of some embodiments, the initial control output is reasonably constrained based on the actual surface temperature of the target electric heating tube to determine the target control output. This may include: first, determining an adjustment coefficient based on the relationship between the actual surface temperature of the target electric heating tube and a preset tube temperature threshold, which is used to reasonably constrain the initial control output; then multiplying the initial control output by the adjustment coefficient to obtain the final target control output.

[0031] Furthermore, the preset tube temperature threshold includes a first tube temperature threshold and a second tube temperature threshold, wherein the first tube temperature threshold is less than the second tube temperature threshold, the first tube temperature threshold is preferably 460℃, and the second tube temperature threshold is preferably 500℃; the adjustment coefficient is determined based on the relationship between the actual surface temperature of the target electric heating tube and the preset tube temperature threshold, and may include the following three cases: In the first case, when the actual surface temperature of the target electric heating tube is less than or equal to the first tube temperature threshold, the adjustment coefficient is determined to be the first preset coefficient. In the second case, when the actual surface temperature of the target electric heating tube is greater than or equal to the second tube temperature threshold, the adjustment coefficient is determined to be the second preset coefficient. In the third scenario, when the actual surface temperature of the target electric heating element is greater than the first temperature threshold but less than the second temperature threshold, the first preset coefficient is lowered based on the actual surface temperature of the target electric heating element to obtain an adjustment coefficient. This ensures that the adjustment coefficient decreases linearly as the temperature rises, and that the adjustment coefficient is greater than the second preset coefficient. In some embodiments, the first preset coefficient is explicitly set to 1, and the second preset coefficient is set to 0. The first difference can be obtained by subtracting the actual surface temperature of the target electric heating element from the first temperature threshold, and the second difference can be obtained by subtracting the second temperature threshold from the first temperature threshold. Then, the ratio between the first difference and the second difference is calculated, and the first preset coefficient is subtracted from the ratio to obtain the final required adjustment coefficient.

[0032] In step S204 of some embodiments, when a thyristor power regulator is selected as the power regulator, controlling the power regulator to adjust the power of multiple electric heating tubes according to the target control output may include: first generating a target current signal based on the target control output, the amplitude range of which is [4mA, 20mA], and then sending the target current signal to the power regulator so that the power regulator can adjust the power of the multiple electric heating tubes.

[0033] For example, if the target control output is 0%, a current signal with an amplitude of 4mA is generated and sent to the power regulator, causing the power regulator to control its internal thyristors to be fully off to completely block the supply current. At this time, the voltage across each electric heating element is 0V, thereby adjusting the output power of each electric heating element to 0. If the target control output is 100%, a current signal with an amplitude of 20mA is generated and sent to the power regulator, causing the power regulator to control its internal thyristors to be fully on. At this time, the effective voltage across each electric heating element is close to the rated voltage of the external power supply, thereby adjusting the output power of each electric heating element to its rated maximum power. If the target control output is 80%, a current signal with an amplitude of 16.8mA is generated and sent to the power regulator, causing the power regulator to adjust the conduction angle of its internal thyristors to ensure that the effective voltage across each electric heating element is close to 89.4% of the rated voltage of the external power supply, thereby adjusting the output power of each electric heating element to 80% of its rated maximum power.

[0034] In step S204 of some embodiments, when a solid-state relay is selected as the power regulator, controlling the power regulator to adjust the power of multiple electric heating tubes according to the target control output may include: first generating a PWM (Pulse Width Modulation) signal based on the target control output, the duty cycle of which is the target control output, and then sending the PWM signal to the power regulator so that the power regulator can adjust the power of the multiple electric heating tubes.

[0035] For example, with a preset control period of 2 seconds, if the target control output is 0%, a PWM signal with a duty cycle of 0% is generated and sent to the power regulator. This PWM signal can be understood as a low-level signal, causing the power regulator to control its internal thyristors to remain in the off state for 2 seconds to completely block the power supply current. At this time, the voltage across each electric heating element is 0V, thereby adjusting the output power of each electric heating element to 0. If the target control output is 100%, a PWM signal with a duty cycle of 100% is generated and sent to the power regulator. This PWM signal can be understood as a high-level signal, causing the power regulator to control its internal thyristors to remain in the off state for 2 seconds to completely block the power supply current. At this time, the voltage across each electric heating element is 0V, thereby adjusting the output power of each electric heating element to 0. The internal thyristor remains in the conducting state for 2 seconds. During this time, the effective voltage across each electric heating element is close to the rated voltage of the external power supply, thereby adjusting the output power of each electric heating element to its rated maximum power. If the target control output is 80%, a PWM signal with a duty cycle of 80% is generated and sent to the power regulator, causing the power regulator to control its internal thyristor to be in the conducting state during the 1.6-second high-level period and in the off state during the 0.4-second low-level period. This allows the output power of each electric heating element to be adjusted to 80% of its rated maximum power under the rapid alternation between full voltage and zero voltage states.

[0036] This application embodiment also provides a heating system for the aforementioned multi-channel extrusion cylinder, which includes at least multiple electric heating tubes, a power regulator, and a control module. The multiple electric heating tubes are correspondingly disposed within multiple mounting holes 111. The power input terminals of the multiple electric heating tubes are all connected to the power output terminal of the power regulator. The power input terminal of the power regulator is connected to an external power supply. The control input terminal of the power regulator is connected to the first output terminal of the control module. The control module can be used to achieve, for example... Figure 2The heating control method shown above. The power regulator can be a solid-state relay or a silicon controlled rectifier (SCR) power regulator, and the control module can include a PLC (Programmable Logic Controller), preferably a Siemens S7-1200 series CPU (Central Processing Unit). The external power supply is generally used to provide 220V AC or 380V AC.

[0037] In some embodiments, the heating system may further include a first temperature sensor and a second temperature sensor. The output of the first temperature sensor is connected to the first input of the control module, and the output of the second temperature sensor is connected to the second input of the control module. The first temperature sensor is used to collect the actual temperature of the inner cylinder 110 and send it to the control module, while the second temperature sensor is used to collect the actual surface temperature of the target electric heating tube and send it to the control module. This provides closed-loop feedback for the subsequent control module to adjust the power of each electric heating tube. Both the first and second temperature sensors can be thermocouples or resistance temperature detectors (RTDs). The first temperature sensor can be located in the area of ​​the inner cylinder 110 where the temperature rises fastest, or it can be located around at least one extrusion hole 112 on the front or rear face of the inner cylinder 110. The second temperature sensor is fixed to the surface of the target electric heating tube by a clamp; this application does not limit the specific location of the sensor.

[0038] In some embodiments, the heating system may further include a conductive component, which is generally disposed on the rear end face of the multi-channel extrusion cylinder and preferably on the rear end face of the outer cylinder 100, to facilitate heat dissipation of the inner cylinder 110; the input end of the conductive component is connected to the power output end of the power regulator, and the output end of the conductive component is connected to the power input end of the plurality of electric heating tubes.

[0039] Furthermore, the conductive component includes a conductive strip 113 and a power connection piece 114, as can be seen in... Figure 1 As shown, one end of the conductive strip 113 is electrically connected to the power input terminals of multiple electric heating elements, and the other end of the conductive strip 113 is connected to one end of the power connection piece 114. The other end of the power connection piece 114 is connected to the power output terminal of the power regulator via a cable. The conductive strip 113 is mainly responsible for efficiently combining current from multiple electric heating elements, enabling them to work together to achieve a more uniform heating effect. The power connection piece 114, as a flexible transition device, can absorb the stress generated by thermal expansion and contraction and mechanical vibration, and can also protect the power regulator and each electric heating element from tensile damage, facilitating independent disassembly and maintenance. The conductive strip 113 can be made of copper busbar, and the power connection piece 114 can be made of soft copper strip.

[0040] In some embodiments, the heating system may further include a switching module connected in series on the power supply line between the power regulator and the external power supply. The control terminal of the switching module is connected to the second output terminal of the control module. The switching module may be a power switching transistor or a relay. Furthermore, the control module is used to acquire and detect the surface temperature of the target electric heating tube in real time. If the detected surface temperature of the target electric heating tube exceeds a preset tube temperature limit alarm value, which is greater than a second tube temperature threshold and preferably 520°C, the control module is turned off to disconnect the power supply line and trigger an over-temperature alarm. This serves as a safety redundancy mechanism to prevent power regulation algorithm failure or accidental over-temperature, reducing the risk of the cylinder material softening or developing thermal fatigue cracks due to overheating, thereby extending the service life of the multi-channel extrusion cylinder.

[0041] It is understood that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those implemented in the above method embodiments, and the beneficial effects achieved by this system embodiment are also the same as those achieved by the above method embodiments.

[0042] When the volume of the multi-channel extrusion cylinder is large, in order to better achieve precise temperature control of the multi-channel extrusion cylinder and eliminate the temperature difference between the axial and circumferential directions of the multi-channel extrusion cylinder, the inner cylinder 110 can be flexibly divided into zones for temperature control. Specifically, the inner cylinder 110 is first virtually divided into at least two first inner cylinder regions along the axial direction. At this time, at least two electric heating tubes are provided in each mounting hole 111, so that each mounting hole 111 in each first inner cylinder region is provided with one electric heating tube. Then, each first inner cylinder region is virtually divided into at least two second inner cylinder regions along the circumferential direction. The number of electric heating tubes provided in each second inner cylinder region is the same or is configured differently according to the heat load distribution of the cylinder. Each second inner cylinder region is preferably penetrated by at least one extrusion hole 112. Here, the circumferential division method of all first inner cylinder regions is the same.

[0043] In practical applications, a corresponding power regulator is first configured for each virtually divided second inner cylinder region. Then, all virtually divided second inner cylinder regions are independently temperature-controlled in parallel, and the temperature control method is the same for all virtually divided second inner cylinder regions. Taking any one of the second inner cylinder regions as an example, its temperature control method is explained as follows: First, the actual temperature of the second inner cylinder region and the actual surface temperature of the first target electric heating tube are obtained. The first target electric heating tube is an electric heating tube set in the sub-region of the second inner cylinder region where the heating temperature rises the fastest. Then, based on the actual temperature of the second inner cylinder region and the preset target temperature, the first initial control output is determined. Then, based on the actual surface temperature of the first target electric heating tube, the first initial control output is reasonably constrained to determine the first target control output. Subsequently, based on the first target control output, the power regulator is controlled to adjust the power of all electric heating tubes contained in the second inner cylinder region. It should be noted that the implementation principle of each of the above steps corresponds to the implementation principle of steps S201 to S204 above, and will not be repeated here.

[0044] The following is a specific application example to explain the above-mentioned zone temperature control process: The target inner cylinder is virtually divided into a first inner cylinder region A and a first inner cylinder region B along the axial direction. One end face of the first inner cylinder region A is the front end face of the target inner cylinder, the other end face of the first inner cylinder region A is one end face of the first inner cylinder region B, and the other end face of the first inner cylinder region B is the rear end face of the target inner cylinder. The first inner cylinder region A is virtually divided circumferentially into a second inner cylinder region A1 and a second inner cylinder region A2. (See also...) Figure 3 As shown, the second inner cylinder region A1 contains 12 electric heating tubes, denoted as HT1 to HT12. The markings for the mounting holes are omitted here to facilitate differentiation of each heating tube. A first temperature sensor TC1 is installed on the end face of the second inner cylinder region A1 to collect the actual temperature of the second inner cylinder region A1. Electric heating tube HT10 is designated as the first target heating tube, and a second temperature sensor TC2 is installed on its surface to collect the actual surface temperature of the electric heating tube HT10. The second inner cylinder region A2 contains 6 electric heating tubes, denoted as HT13 to HT18. The markings for the mounting holes are omitted here to facilitate differentiation of each heating tube. A first temperature sensor TC3 is installed on the end face of the second inner cylinder region A2 to collect the actual temperature of the second inner cylinder region A2. Electric heating tube HT17 is designated as the first target heating tube, and a second temperature sensor TC4 is installed on its surface to collect the actual surface temperature of the electric heating tube HT17. Similarly, the first inner cylinder region B is virtually divided circumferentially into a second inner cylinder region B1 and a second inner cylinder region B2, as shown in [reference]. Figure 4As shown, the second inner cylinder region B1 contains 12 electric heating tubes, denoted as HT19 to HT30. The markings for the mounting holes are omitted here to facilitate identification of each heating tube. A first temperature sensor TC5 is installed on the end face of the second inner cylinder region B1 to collect the actual temperature of the second inner cylinder region B1. Electric heating tube HT21 is designated as the first target heating tube, and a second temperature sensor TC6 is installed on its surface to collect the actual surface temperature of electric heating tube HT21. The second inner cylinder region B2 contains 6 electric heating tubes, denoted as HT31 to HT36. The markings for the mounting holes are omitted here to facilitate identification of each heating tube. A first temperature sensor TC7 is installed on the end face of the second inner cylinder region B2 to collect the actual temperature of the second inner cylinder region B2. Electric heating tube HT35 is designated as the first target heating tube, and a second temperature sensor TC8 is installed on its surface to collect the actual surface temperature of electric heating tube HT35. In practical applications, a parallel control method is adopted. Based on the actual temperature of the second inner cylinder region A1 and the actual surface temperature of the electric heating element HT10, the power regulator configured for the second inner cylinder region A1 adjusts the power of the electric heating elements HT1 to HT12. Based on the actual temperature of the second inner cylinder region A2 and the actual surface temperature of the electric heating element HT17, the power regulator configured for the second inner cylinder region A2 adjusts the power of the electric heating elements HT13 to HT18. Based on the actual temperature of the second inner cylinder region B1 and the actual surface temperature of the electric heating element HT2... The actual surface temperature of the second inner cylinder region B1 is used to control the power of electric heating tubes HT19 to HT30. Based on the actual temperature of the second inner cylinder region B2 and the actual surface temperature of electric heating tube HT35, the power of electric heating tubes HT31 to HT36 is controlled by the power regulator configured for the second inner cylinder region B2. This allows for fine adjustment of the axial and circumferential heat load differences of the multi-channel extrusion cylinder, effectively reducing the temperature difference between each extrusion hole and creating favorable conditions for isothermal extrusion.

[0045] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the heating control method described above. This electronic device can include any smart terminal such as a tablet computer or desktop computer.

[0046] It is understood that the content of the above method embodiments is applicable to the present device embodiments. The specific functions implemented by the present device embodiments are the same as those implemented by the above method embodiments, and the beneficial effects achieved by the present device embodiments are also the same as those achieved by the above method embodiments.

[0047] Please see Figure 5 , Figure 5 This is a schematic diagram illustrating the hardware structure of an electronic device according to another embodiment. The electronic device includes: The processor 301 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 302 can be implemented as a read-only memory (ROM), static storage device, dynamic storage device, or random access memory (RAM). The memory 302 can store the operating system and other applications. When the technical solutions provided in the embodiments of this application are implemented through software or firmware, the relevant program code is stored in the memory 302 and is called and executed by the processor 301. Input / output interface 303 is used to implement information input and output; The communication interface 304 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 305 transmits information between various components of the device (e.g., processor 301, memory 302, input / output interface 303, and communication interface 304); The processor 301, memory 302, input / output interface 303 and communication interface 304 are connected to each other within the device via bus 305.

[0048] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described heating control method.

[0049] It is understood that the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented by this storage medium embodiment are the same as those implemented by the above method embodiments, and the beneficial effects achieved by this storage medium embodiment are also the same as those achieved by the above method embodiments.

[0050] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0051] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0052] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0053] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0054] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0055] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0056] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0057] In the embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0058] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0059] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0060] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0061] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A heating control method for a multi-channel extrusion cylinder, the multi-channel extrusion cylinder comprising an outer cylinder and an inner cylinder sleeved within the outer cylinder, characterized in that, An array of extrusion holes and multiple mounting holes are provided axially in the inner cylinder. The multiple mounting holes are arranged circumferentially around the outer periphery of the array of extrusion holes, and multiple electric heating tubes are correspondingly arranged in the multiple mounting holes; the heating control method includes: The actual temperature of the inner cylinder and the actual surface temperature of the target electric heating tube are obtained. The target electric heating tube is an electric heating tube set in the region of the inner cylinder where the temperature rises the fastest. The initial control output is determined based on the actual temperature of the inner cylinder and the preset target temperature. Based on the actual surface temperature of the target electric heating tube, the initial control output is reasonably constrained to determine the target control output. Based on the target control output, the power regulator adjusts the power of the plurality of electric heating tubes.

2. The heating control method according to claim 1, characterized in that, The step of applying reasonable constraints to the initial control output based on the actual surface temperature of the target electric heating element to determine the target control output includes: The adjustment coefficient is determined based on the relationship between the actual surface temperature of the target electric heating tube and the preset tube temperature threshold. The target control output is obtained by multiplying the initial control output by the adjustment coefficient.

3. The heating control method according to claim 2, characterized in that, The preset pipe temperature threshold includes a first pipe temperature threshold and a second pipe temperature threshold, wherein the first pipe temperature threshold is less than the second pipe temperature threshold. The step of determining the adjustment coefficient based on the relationship between the actual surface temperature of the target electric heating tube and the preset tube temperature threshold includes: When the actual surface temperature of the target electric heating tube is less than or equal to the first tube temperature threshold, the adjustment coefficient is determined to be the first preset coefficient; When the actual surface temperature of the target electric heating tube is greater than or equal to the second tube temperature threshold, the adjustment coefficient is determined to be the second preset coefficient; When the actual surface temperature of the target electric heating tube is greater than the first tube temperature threshold but less than the second tube temperature threshold, the first preset coefficient is lowered according to the actual surface temperature of the target electric heating tube to obtain the adjustment coefficient, and the adjustment coefficient is greater than the second preset coefficient.

4. The heating control method according to claim 3, characterized in that, The first preset coefficient is set to 1, and the second preset coefficient is set to 0; the adjustment coefficient is obtained by lowering the first preset coefficient according to the actual surface temperature of the target electric heating tube, including: The first difference is obtained by subtracting the actual surface temperature of the target electric heating tube from the first tube temperature threshold; and the second difference is obtained by subtracting the second tube temperature threshold from the first tube temperature threshold. Calculate the ratio between the first difference and the second difference, and then subtract the ratio from the first preset coefficient to obtain the adjustment coefficient.

5. A heating system for a multi-channel extrusion cylinder, the multi-channel extrusion cylinder comprising an outer cylinder and an inner cylinder sleeved within the outer cylinder, characterized in that, An array of extrusion holes and multiple mounting holes are provided axially in the inner cylinder, and the multiple mounting holes are arranged circumferentially around the outer periphery of the array of extrusion holes; the heating system includes multiple electric heating tubes, a power regulator and a control module, and the multiple electric heating tubes are correspondingly arranged in the multiple mounting holes; The power input terminals of the plurality of electric heating tubes are connected to the power output terminals of the power regulator, the power input terminals of the power regulator are connected to an external power supply, the control input terminals of the power regulator are connected to the first output terminal of the control module, and the control module is used to implement the heating control method according to any one of claims 1 to 4.

6. The heating system according to claim 5, characterized in that, The heating system also includes a first temperature sensor and a second temperature sensor; The output terminal of the first temperature sensor is connected to the first input terminal of the control module. The first temperature sensor is used to collect the actual temperature of the inner cylinder and send it to the control module. The output terminal of the second temperature sensor is connected to the second input terminal of the control module. The second temperature sensor is used to collect the actual surface temperature of the target electric heating tube and send it to the control module.

7. The heating system according to claim 5, characterized in that, The heating system also includes a conductive component disposed on the rear end face of the multi-channel extrusion cylinder; The input terminal of the conductive component is connected to the power output terminal of the power regulator, and the output terminal of the conductive component is connected to the power input terminal of the plurality of electric heating tubes.

8. The heating system according to claim 5, characterized in that, The heating system also includes a switch module, which is connected in series in the power supply line between the power regulator and the external power supply. The control terminal of the switch module is connected to the second output terminal of the control module. The control module is also used to: acquire and detect the surface temperature of the target electric heating tube in real time; if the surface temperature of the target electric heating tube is detected to be greater than the preset tube temperature limit alarm value, control the switch module to turn off to cut off the power supply line and issue an over-temperature alarm.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the heating control method according to any one of claims 1 to 4.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the heating control method according to any one of claims 1 to 4.

Images