Constant-temperature cutting system of plate cutting machine and control method

Abstract

The invention discloses a constant-temperature cutting system of a plate cutting machine and a control method, and the constant-temperature cutting system comprises a cutting execution module which comprises a transverse cutting knife roller and a dead knife cross beam; the transverse cutting knife roller is provided with a first water circulation channel, the dead knife cross beam is provided with a second water circulation channel, the first water circulation channel is connected with a first circulation water pump to form a first water circulation assembly, and the second water circulation channel is connected with a second circulation water pump to form a second water circulation assembly; water distribution is achieved through a flow distribution valve, and water temperature is adjusted through a temperature adjusting device; the system further comprises a detection module which comprises a first temperature sensor, a second temperature sensor and a cutting force sensor. And the control module is electrically connected with the first temperature sensor, the second temperature sensor and the cutting force sensor to generate a control instruction.

Description

Technical Field

[0001] This invention belongs to the field of constant temperature control technology for plate cutting machines, specifically relating to a constant temperature cutting system and control method for plate cutting machines. Background Technology

[0002] Plate cutting machines are widely used in papermaking, printing and packaging, and machining industries. Their core working components are the cross-cutting roller and the bottom blade beam. During continuous cutting, the cross-cutting roller and bottom blade beam generate a large amount of heat due to continuous cutting friction. This heat accumulates inside the components, causing thermal expansion and contraction, which in turn leads to irregular fluctuations in the blade distance, disrupting the consistency of the cutting effect and failing to meet the requirements for high-precision cutting.

[0003] Early methods primarily employed simple circulating water cooling to lower the temperature of the cutting equipment body. For example, Chinese patent CN201565663U disclosed a circulating water cooling system for the shearing machine body and a water mist cooling device for the blades. This system cooled the machine body by setting circulating water channels in the left and right wall panels, upper blade holder, and lower blade holder, ensuring sufficient strength and rigidity under high-temperature conditions. However, this solution used a simple open-loop cooling control and lacked a precise temperature feedback and regulation mechanism.

[0004] With the development of control technology, Chinese patent CN113370310B discloses a control method for a temperature control system of a sheet metal hot cutting machine. This method involves setting a temperature detection device on the hot cutting blade to collect its temperature signal and outputting a corresponding current to the blade based on the temperature detection information, thereby adjusting the blade temperature. While this solution achieves temperature feedback control, its controlled object is the hot cutting blade itself, and the temperature control method is direct electric heating, using temperature as the control parameter, which limits the cutting accuracy.

[0005] In the papermaking and pulp board cutting industry, existing solutions for cutting machines have the following technical problems: Changes in operating conditions, such as fluctuations in cutting force, material hardness, and cutting speed, affect the actual temperature of the cutting components and the blade distance, easily leading to accuracy deviations. Furthermore, existing technologies can only maintain water temperature fluctuations within a certain range (usually ±2℃ or higher), failing to precisely control the actual temperature of the blade roller and crossbeam body. Blade distance fluctuations caused by thermal expansion and contraction are difficult to effectively suppress, thus failing to meet the stringent requirements of high-precision cutting. Summary of the Invention

[0006] This invention provides a constant temperature cutting system and control method for a plate cutting machine to solve the problem of difficulty in balancing the accuracy and efficiency of the plate cutting machine caused by the disconnect between temperature control and cutting conditions and the decay of temperature control accuracy. It achieves precise constant temperature control of the cross-cutting roller and the bottom blade beam, thereby improving the cutting accuracy.

[0007] The technical solution adopted in this invention is as follows: A constant temperature cutting system for a plate cutting machine, comprising: A cutting execution module, comprising a cross-cutting roller and a bottom blade beam; The water circulation module includes a first water circulation component for adjusting the temperature of the cross-cutting roller and a second water circulation component for adjusting the temperature of the bottom blade beam. The cross-cutting roller is provided with a first water circulation channel, and the bottom blade crossbeam is provided with a second water circulation channel. The first water circulation channel is connected to a first circulating water pump to form a first water circulation assembly, and the second water circulation channel is connected to a second circulating water pump to form a second water circulation assembly. The water circulation module also includes a water tank, which is connected to the first water circulation component and the second water circulation component via a flow distribution valve to distribute water volume. And a temperature regulating device to regulate the water temperature supplied to the first water circulation component and the second water circulation component; The system also includes, The detection module includes a first temperature sensor disposed on the cross-cutting roller, a second temperature sensor disposed on the bottom blade crossbeam, and a cutting force sensor; The control module is electrically connected to the first temperature sensor, the second temperature sensor, and the cutting force sensor, respectively. It generates a first temperature deviation signal based on the signal from the first temperature sensor, which is used to control the water flow rate and / or temperature within the first water circulation component. Based on the signal from the second temperature sensor, a second temperature deviation signal is generated to control the water flow rate and / or temperature within the second water circulation component. The cutting load status signal is generated based on the cutting force sensor signal and preset working condition parameters, which is used to control the feed speed of the cutting machine.

[0008] The constant temperature cutting system for a plate cutting machine provided in this application also has the following additional technical features: The first water circulation channel includes a first water inlet located at one end of the cross-cutting roller in the axial direction, and a first water outlet located at the other end of the cross-cutting roller in the axial direction. From the water inlet to the water outlet, the first water circulation channel extends spirally within the cross-cutting roller.

[0009] The first water circulation channel is provided with multiple inwardly protruding guide ridges, which are curved in an arc shape towards the first water outlet end.

[0010] The temperature regulating device includes a first heating element and a second heating element. The first heating element is used for heating the water in the first water circulation assembly; The second heating element is used for heating the water in the second water circulation assembly.

[0011] The temperature regulating device also includes multiple cooling components disposed in the water tank. The water tank is configured with a first partition corresponding to the first water circulation component and a second partition corresponding to the second water circulation component. Water is distributed to the first and second water circulation components via a flow distribution valve. Some of the cooling components are disposed in the first partition, and some of the cooling components are disposed in the second partition, so as to achieve partition water cooling.

[0012] The water tank is also equipped with a liquid level monitoring sensor and a water temperature monitoring sensor. The liquid level monitoring sensor and the water temperature monitoring sensor are respectively connected to the controller and are used for emergency control when the liquid level is lower than the preset value and / or the water temperature exceeds the preset range.

[0013] The second aspect of this application provides a method for controlling the constant temperature cutting of a plate cutting machine, including: Temperature signals of the cross-cutting roller and bottom blade beam are collected periodically, and cutting force signals between the cross-cutting roller and bottom blade beam are collected periodically during the cutting process; The temperature signal of the cross-cutting roller is compared with the preset target temperature to obtain the first temperature deviation signal; the temperature signal of the bottom crossbeam is compared with the preset target temperature to obtain the second temperature deviation signal; and the cutting force signal is compared with the preset cutting force threshold. According to the first temperature deviation signal, the water flow rate and / or temperature in the first water circulation component are controlled accordingly, and according to the second temperature deviation signal, the water flow rate and / or temperature in the second water circulation component (22) are controlled accordingly, so as to adjust the temperature of the cross-cutting roller and the bottom blade beam; When the cutting force signal exceeds the preset cutting force threshold, the feed speed of the cutting machine is reduced by combining the preset working condition parameters. The preset target temperature is determined based on the temperature of the material being cut, and the preset target temperature corresponding to the cross-cutting roller is lower than that of the bottom blade beam.

[0014] Specifically, when controlling the water flow rate and / or temperature within the first and second water circulation components, an adaptive energy-saving optimization logic is employed, as follows: Periodically acquire current operating parameters and ambient temperature data; A system energy consumption optimization model is established, with the sum of the energy consumption of the circulating pump and the energy consumption of the temperature control device as the objective function and the temperature control accuracy as the constraint condition. Based on the current operating parameters and ambient temperature data, the system energy consumption optimization model is used to solve for the combination of operating parameters, which includes the circulating pump flow rate and temperature regulation power. Based on the combination of operating parameters, control commands are output to the circulating pump and temperature regulating device to make them operate according to the combination of operating parameters.

[0015] The method further includes using adaptive fuzzy compensation logic to correct the combination of operating parameters, specifically: Obtain the current operating condition parameters, which include at least the type of material to be cut and the cutting speed; Based on the operating parameters, the correction coefficients of the control parameters are determined using a preset fuzzy rule base; The correction factor is applied to the current operating parameters to generate the corrected operating parameters; Based on the modified combination of operating parameters, the control output for flow rate and / or temperature is obtained.

[0016] The method also includes an error memory correction function, specifically: Record historical temperature control deviation data under different operating conditions and parameters. The historical temperature control deviation data includes at least one of temperature overshoot, steady-state error, and response time. Statistical analysis was performed on historical temperature control deviation data under the same cutting conditions to generate optimization correction coefficients corresponding to the cutting conditions. When the same operating parameters are identified again, the optimized correction coefficient is used as the initial correction coefficient of the adaptive fuzzy compensation logic.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are as follows: 1. In this invention, a cutting force sensor is added to the cutting machine, and a first temperature deviation signal is generated in the control module based on the first temperature sensor signal to control the water flow rate and / or temperature in the first water circulation component. A second temperature deviation signal is generated based on the second temperature sensor signal to control the water flow rate and / or temperature in the second water circulation component. A cutting load state signal is generated based on the cutting force sensor signal combined with preset working condition parameters to control the feed speed of the cutting machine. The cutting force, a core process parameter directly reflecting the cutting conditions, is introduced, achieving coordinated control of both temperature and cutting force. The cutting force sensor directly collects the interaction force between the tool and the workpiece during the cutting process. This parameter most intuitively reflects working condition information such as changes in cutting load, material hardness fluctuations, and tool wear. By collecting cutting force data between the cross-cutting roller and the bottom blade beam through the cutting force sensor, the control module can simultaneously sense temperature deviation and changes in cutting load, thereby effectively suppressing accuracy deviations caused by changes in working conditions (such as material hardness fluctuations and changes in cutting speed).

[0018] Furthermore, the control module generates a cutting load status signal based on the cutting force sensor signal and preset working parameters. This signal can be used to control and reduce the feed speed of the cutting machine. By establishing a linkage between cutting force and feed speed, the feed speed is actively reduced when the cutting force exceeds a threshold to protect the tool and ensure accuracy. When the cutting force is normal, the feed speed is allowed to remain at a higher level to ensure efficiency. This effectively improves processing quality and production efficiency, while extending tool life and reducing production costs. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a structural diagram of the constant temperature cutting system of the plate cutting machine according to one embodiment of the present invention, wherein the arrow indicates the direction of water circulation; Figure 2 This is a schematic diagram of the constant temperature cutting system of the plate cutting machine according to one embodiment of the present invention; Figure 3 This is a cross-sectional view of the cross-cutting roller according to one embodiment of the present invention; Figure 4 This is an unfolded view of the first water circulation channel according to one embodiment of the present invention, wherein the arrows indicate the direction of water circulation; Figure 5 This is a cross-sectional view of the bottom cutter beam according to one embodiment of the present invention; Figure 6 This is a cross-sectional view of the water tank according to one embodiment of the present invention.

[0020] in: 1. Cutting execution module; 11. Cross-cutting roller; 12. Bottom blade beam; 2. Water circulation module; 21. First water circulation component; 211. First water circulation channel; 2111. Guide ribs; 212. First circulating water pump; 22. Second water circulation component; 221. Second water circulation channel; 222. Second circulating water pump; 23. Water tank; 231. Flow distribution valve; 24. Temperature regulating device; 241. First heating element; 242. Second heating element; 243. Cooling element; 3. Detection module; 31. First temperature sensor; 32. Second temperature sensor; 33. Cutting force sensor; 34. Liquid level monitoring sensor; 35. Water temperature monitoring sensor; 4. Control module. Detailed Implementation

[0021] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0023] like Figure 1 and Figure 2 As shown, a constant temperature cutting system for a plate cutting machine includes: Cutting execution module 1, which includes a cross-cutting roller 11 and a bottom blade beam 12; The water circulation module 2 includes a first water circulation component 21 for adjusting the temperature of the cross-cutting roller 11, and a second water circulation component 22 for adjusting the temperature of the bottom blade beam 12. The cross-cutting roller 11 is provided with a first water circulation channel 211, and the bottom blade crossbeam 12 is provided with a second water circulation channel 221. The first water circulation channel 211 is connected to a first circulating water pump 212 to form the first water circulation assembly 21, and the second water circulation channel 221 is connected to a second circulating water pump 222 to form the second water circulation assembly 22. The water circulation module 2 also includes a water tank 23, which is connected to the first water circulation component 21 and the second water circulation component 22 via a flow distribution valve 231 to distribute water volume. And a temperature regulating device 24 to regulate the water temperature supplied to the first water circulation component 21 and the second water circulation component 22; The system also includes, The detection module 3 includes a first temperature sensor 31 disposed on the cross-cutting roller 11, a second temperature sensor 32 disposed on the bottom blade crossbeam 12, and a cutting force sensor 33. Control module 4 is electrically connected to the first temperature sensor 31, the second temperature sensor 32, and the cutting force sensor 33, respectively. It generates a first temperature deviation signal based on the signal from the first temperature sensor 31, which is used to control the water flow rate and / or temperature within the first water circulation component 21. A second temperature deviation signal is generated based on the signal from the second temperature sensor 32, which is used to control the water flow rate and / or temperature within the second water circulation component 21. The cutting load status signal is generated based on the signal from the cutting force sensor 33 and the preset working parameters, which is used to control the feed speed of the cutting machine.

[0024] The cutting execution module 1 includes a cross-cutting roller 11 and a bottom blade beam 12. The cross-cutting roller 11 is a cylindrical structure made of high-strength alloy material, possessing both wear resistance and deformation resistance, and its surface is used to mount cutting tools. The bottom blade beam 12 is a long strip structure, positioned opposite the cross-cutting roller 11, forming a cutting area between them. During the operation of the cutting machine, the cross-cutting roller 11 rotates and cooperates with the bottom blade beam 12 to perform transverse cutting on the paper web or board material passing through the cutting area.

[0025] The water circulation module 2 includes a first water circulation component 21, a second water circulation component 22, a water tank 23, a flow distribution valve 231, and a temperature regulating device 24.

[0026] The first water circulation component 21 is used to regulate the temperature of the cross-cutting roller 11. A first water circulation channel 211 is provided inside the cross-cutting roller 11, which is connected to the first circulating water pump 212 to form the first water circulation component 21. Hot water flows through the internal area of ​​the cross-cutting roller 11, thereby regulating the temperature of the cross-cutting roller 11 and preventing thermal deformation caused by temperature changes.

[0027] The second water circulation component 22 is used to regulate the temperature of the bottom cutter beam 12. A second water circulation channel 221 is provided inside the bottom cutter beam 12, which is connected to the second circulating water pump 222 to form the second water circulation component 22. It can be understood that the second water circulation channel 221 is designed according to the shape, installation position, and stress conditions of the bottom cutter beam 12, conforming to the inner wall of the beam to ensure that the channel can evenly cover the entire beam. Figure 5 As shown, this helps avoid uneven local temperatures.

[0028] The cross-cutting roller 11 and the bottom blade beam 12 have significantly different working states and thermal characteristics in the cutting machine. If a series layout is adopted, that is, the circulating water flows through one component first and then through the other component, it is impossible to independently adjust the flow rate and temperature according to the actual temperature requirements of each component, which will inevitably lead to the limited temperature control effect of one component. The second water circulation channel 221 and the first water circulation channel 211 adopt a parallel layout, which can realize independent control and adjust the circulation flow rate according to the temperature deviation of the cross-cutting roller 11 and the bottom blade beam 12 respectively.

[0029] Water tank 23 is used to store hot water to be circulated, serving as the liquid storage and heat exchange container for the entire water circulation system. Water tank 23 is connected to the first water circulation component 21 and the second water circulation component 22 via flow distribution valve 231, enabling water distribution to the two components. By setting the flow distribution valve 231, the flow rate of hot water entering the two circulation components can be independently allocated according to the actual temperature requirements of the cross-cutting roller 11 and the bottom cutter beam 12, achieving differentiated temperature regulation.

[0030] The temperature regulating device 24 is used to regulate the water temperature supplied to the first water circulation component 21 and the second water circulation component 22. Specifically, the temperature regulating device 24 includes a heating element and a cooling element 243. Through the coordinated operation of the heating element and the cooling element 243, precise regulation of the water temperature is achieved.

[0031] The detection module 3 includes a first temperature sensor 31, a second temperature sensor 32, and a cutting force sensor 33. The first temperature sensor 31 is mounted on the cross-cutting roller 11, preferably close to the cutting surface, and is used to periodically collect the actual working temperature of the cross-cutting roller 11. The second temperature sensor 32 is mounted on the bottom blade beam 12, preferably close to the cutting surface, and is used to periodically collect the actual working temperature of the bottom blade beam 12. Specifically, the first temperature sensor 31 and the second temperature sensor 32 are high-precision PT100 resistance temperature detectors, with a sampling frequency of no less than 10 times / second to ensure the real-time performance and accuracy of the temperature signals.

[0032] A cutting force sensor 33 is positioned below the cutting surface of the bottom cutter beam 12 to periodically collect cutting force data between the cross-cutting blade and the bottom cutter during the cutting process. Cutting force is a core process parameter reflecting changes in cutting conditions, directly reflecting information such as material hardness fluctuations, tool wear, and changes in cutting load. By installing the cutting force sensor 33, the system can sense dynamic changes in cutting conditions, providing data support for subsequent coordinated control.

[0033] The control module 4 is electrically connected to the first temperature sensor 31, the second temperature sensor 32, and the cutting force sensor 33, and is also electrically connected to the first circulating water pump 212, the second circulating water pump 222, the flow distribution valve 231, the temperature regulating device 24, and other actuators. Specifically, the control module 4 uses a programmable logic controller (PLC) and has built-in corresponding control programs and algorithms.

[0034] The control module 4 receives temperature signals collected by the first temperature sensor 31 and the second temperature sensor 32. It compares the signal from the first temperature sensor 31 with a preset target temperature to generate a first temperature deviation signal, which is used to control the water flow rate and / or temperature within the first water circulation component 21. Similarly, it compares the signal from the second temperature sensor 32 with the preset target temperature to generate a second temperature deviation signal, which is used to control the water flow rate and / or temperature within the second water circulation component 21. The preset target temperature is determined based on the temperature of the material being cut. The preset target temperature corresponding to the cross-cutting roller 11 is lower than the preset target temperature corresponding to the bottom blade beam 12. For example, when the paper web temperature is 35°C, the target temperature of the bottom blade beam 12 can be set to 35°C, and the target temperature of the cross-cutting roller 11 can be set to 33°C.

[0035] The cross-cutting roller 11 is a rotating component, and its rotational motion itself has a certain heat dissipation capacity and more sufficient contact with air; the bottom crossbeam 12 is a fixed component, and its heat dissipation conditions are relatively poor. Setting target temperatures according to the different motion characteristics and heat dissipation conditions of the two components is beneficial for achieving temperature adaptation.

[0036] Furthermore, the cross-cutting roller 11 and the bottom blade beam 12 form a fitting gap during the cutting process. If their temperatures are the same, thermal expansion may cause the gap to be too small or even cause interference. Setting the target temperature of the cross-cutting roller 11 lower than that of the bottom blade beam 12 can establish a temperature gradient between them, ensuring that the roller maintains a reasonable fitting gap with the bottom blade beam 12 during rotation.

[0037] The control module 4 receives the cutting force signal collected by the cutting force sensor 33 and generates a cutting load status signal by combining it with preset working condition parameters (such as the type of cutting material and the cutting speed). The cutting load status signal is used to determine whether the current cutting condition is within the normal range. When the cutting force exceeds the preset threshold, it indicates that the cutting load is too large, which may be due to sudden changes in material hardness, accelerated tool wear, or excessive feed rate.

[0038] The control module 4 generates control commands based on the cutting load status signal to control the feed speed of the cutting machine.

[0039] The constant temperature cutting system of this plate cutter achieves coordinated control of both temperature and cutting force. The temperature deviation signal ensures that the cutting components remain within the target temperature range, avoiding blade distance fluctuations caused by thermal expansion and contraction; the cutting load status signal ensures that the cutting force remains within a safe threshold, preventing accuracy deviations and tool damage caused by sudden changes in operating conditions. The two work together synergistically, enabling the system to adapt to various operating conditions, ensuring cutting accuracy while also considering cutting efficiency and tool life.

[0040] As a preferred embodiment of the present invention, such as Figure 3 As shown, the first water circulation channel 211 includes a first water inlet end disposed at any one end of the cross-cutting roller 11 in the axial direction, and a first water outlet end disposed at the other end of the cross-cutting roller 11 in the axial direction. From the water inlet to the water outlet, the first water circulation channel 211 extends spirally within the cross-cutting roller 11.

[0041] The cross-cutting roller 11 has a cylindrical structure and is made of high-strength alloy material, which combines wear resistance and deformation resistance. The first water circulation channel 211 extends axially spirally inside the cross-cutting roller 11, forming a structure similar to a spiral pipe.

[0042] Specifically, the first water inlet is located at either end of the cross-cutting roller 11 in the axial direction (such as the operating side end), and the first water outlet is located at the other end of the cross-cutting roller 11 in the axial direction (such as the transmission side end). Hot water entering from the first water inlet spirals along the spiral channel inside the roller, flows through the entire axial length of the roller, and then flows out from the first water outlet.

[0043] The number of spiral turns, pitch, and cross-sectional dimensions of the spiral channel are designed based on the diameter and length of the cross-cutting roller 11 and the expected heat exchange requirements. For example, for a cross-cutting roller 11 with a larger diameter and longer length, the number of spiral turns can be appropriately increased or the pitch can be decreased to increase the flow path length and residence time of hot water within the roller, thereby improving heat exchange efficiency. For a cross-cutting roller 11 with a smaller diameter and shorter length, the number of spiral turns can be reduced or the pitch can be increased accordingly to reduce flow resistance and ensure the operating efficiency of the circulation system.

[0044] Specifically, the ratio of the helical channel pitch to the channel diameter is preferably 3:1 to 5:1. Within this range, sufficient heat exchange area is ensured while controlling flow resistance within a reasonable range. The number of helical turns is determined based on the length of the cutter roller, and is usually no less than 3 turns to ensure that the hot water flows through a sufficiently long path. The channel cross-sectional diameter is determined based on the required hot water flow rate and the head of the circulating pump, and is usually 10mm-30mm.

[0045] The spiral channel allows hot water to advance in a spiral motion inside the cutter roller. The path of the hot water covers the entire circumference and axial direction of the cutter roller. During the heat transfer process, the heat is continuously absorbed by the cutter roller. However, due to the continuity and periodicity of the spiral path, the heat exchange at different axial positions of the cutter roller tends to be equal, thereby effectively suppressing the formation of axial temperature gradients and achieving a uniform temperature distribution throughout the cutter roller. At the same time, the centrifugal force and secondary flow effect generated by the spiral flow can disrupt the fluid boundary layer, enhance fluid disturbance and mixing, and further improve the heat transfer coefficient.

[0046] It should be noted that the cross-cutting roller 11 rotates at high speed during the cutting process. The extension direction of the spiral channel and the rotation direction of the roller can be designed in tandem, i.e., opposite, so that the hot water is subjected to centrifugal force when flowing in the channel, which can generate a stronger disturbance effect and further enhance the heat exchange effect.

[0047] As a preferred embodiment of this implementation, such as Figure 4 As shown, the first water circulation channel 211 is provided with a plurality of inwardly protruding guide ridges 2111. The guide ridges 2111 are curved in an arc shape towards the first water outlet end, that is, their protrusion direction is curved along the fluid flow direction. The plurality of guide ridges 2111 are arranged at intervals along the extension direction of the first water circulation channel 211 to form a periodic or non-periodic ridge sequence.

[0048] The guide ridges 2111 are arc-shaped protrusions with a height of 5%-15% of the channel diameter. The length of the ridges along the fluid flow direction is 10%-30% of the channel diameter, and the spacing between adjacent ridges is 1-3 times the channel diameter. The curvature of the ridges is consistent with the fluid flow direction, meaning the highest point of the ridges is biased towards the first outlet end, forming a shape similar to fish scales or an arrowhead.

[0049] The guide ridges 2111 bend towards the first water outlet. When fluid flows through the ridges, the arc-shaped surface of the ridges guides the fluid, causing the flow direction to deflect and forming a spiral flow component at a certain angle to the channel axis. This spiral flow component superimposes on the spiral extension direction of the first water circulation channel 211 itself, forming a more complex spiral flow field structure. The spiral flow effectively disrupts the boundary layer of the fluid near the inner wall of the channel, causing strong turbulence and mixing at the wall surface, significantly improving the convective heat transfer coefficient. The heat distribution along the circumference and axial direction of the channel is more uniform, avoiding temperature unevenness caused by local overheating or undercooling. Moreover, the raised structure of the guide ridges 2111 increases the surface area of ​​the inner wall of the first water circulation channel 211, increasing the contact area between the hot water and the inner wall of the channel.

[0050] The curved structure of the flow-guiding ridges 2111 generates local turbulence and scouring effects during fluid flow, enhancing the scouring effect of the fluid on the inner wall of the channel and effectively inhibiting the deposition and adhesion of scale on the inner wall of the channel. At the same time, the gaps between the flow-guiding ridges 2111 form a self-cleaning flow channel, where deposits are easily carried away by the fluid scouring action, avoiding the decrease in heat exchange efficiency and channel blockage caused by scale accumulation.

[0051] Furthermore, it is understandable that the bending direction of the ridges is consistent with the direction of fluid flow, which avoids local resistance loss caused by structural abrupt changes. While improving heat exchange efficiency, it does not significantly increase flow resistance, which is beneficial to reducing the energy consumption of the circulating pump.

[0052] As a preferred embodiment of the present invention, such as Figure 1 As shown, the temperature regulating device 24 includes a first heating element 241 and a second heating element 242. The first heating element 241 is used for heating the water in the first water circulation assembly 21; The second heating element 242 is used for heating the water in the second water circulation assembly 22.

[0053] The temperature regulating device 24 adopts an independent heating component design, that is, the first water circulation component 21 and the second water circulation component 22 are each equipped with an independent heating element, forming two relatively independent but cooperative heating circuits.

[0054] The first heating element 241 is installed on the inlet pipe of the first water circulation channel 211 and connected in series with the first circulating water pump 212. The first circulating water pump 212 draws hot water from the water tank 23. After the hot water flows through the first heating element 241 and is heated to the target temperature, it enters the first water circulation channel 211 to heat the cross-cutting roller 11. The hot water after heat exchange flows out from the outlet end of the first water circulation channel 211.

[0055] The second heating element 242 is installed on the inlet pipe of the second water circulation channel 221 and connected in series with the second circulating water pump 222. The second circulating water pump 222 draws hot water from the water tank 23. After the hot water flows through the second heating element 242 and is heated to the target temperature, it enters the second water circulation channel 221 to heat the bottom knife beam 12. The hot water after heat exchange flows out from the outlet end of the second water circulation channel 221.

[0056] The first heating element 241 and the second heating element 242 can be in the form of electric heating tubes, electromagnetic heaters, or heat exchangers. Specifically, electric heating tubes are used, which have advantages such as fast heating speed, high control precision, and compact structure. The power of the heating tube is designed to match the heat load requirements of the cutting component, typically ranging from 1kW to 5kW.

[0057] The cross-cutting roller 11 and the bottom crossbeam 12 have fundamental differences in structural form, motion state, heat generation mechanism and heat dissipation conditions. The two have different requirements for heating power, heating speed and temperature accuracy.

[0058] If a single heating element is used to provide a heat source for both water circulation components, the heating power cannot be independently adjusted according to the temperature difference between the two components, which will inevitably lead to limited temperature control of one of the components. For example, when the cross-cutting roller 11 needs to heat up quickly while the bottom crossbeam 12 is already close to the target temperature, the shared heating element cannot simultaneously meet the needs of rapid heating and small-scale adjustment, which may cause the bottom crossbeam 12 to overheat.

[0059] By setting up independent first heating element 241 and second heating element 242, the control module 4 can independently control the start / stop and heating power of the two heating elements according to the temperature deviation signals collected by the first temperature sensor 31 and the second temperature sensor 32, so as to achieve differentiated and precise heating of the cross-cutting roller 11 and the bottom blade beam 12.

[0060] Based on the heat load requirements of the cross-cutting roller 11 and the bottom crossbeam 12, the power required by the first heating element 241 and the second heating element 242 are calculated respectively. The heat load requirements can be estimated using the following formula: , Where P is the heating power, c is the specific heat capacity of water, m is the mass flow rate of circulating water per unit time, ΔT is the required temperature rise, and t is the heating time.

[0061] As a preferred embodiment of this implementation, such as Figure 6 As shown, the temperature regulating device 24 also includes a plurality of cooling components 243 disposed in the water tank 23. The water tank 23 is configured with a first partition corresponding to the first water circulation component 21 and a second partition corresponding to the second water circulation component 22. Water is distributed to the first water circulation component 21 and the second water circulation component 22 through the flow distribution valve 231. Some of the cooling components 243 are disposed in the first partition, and some of the cooling components 243 are disposed in the second partition, so as to achieve partition water cooling.

[0062] The cooling component 243 is located inside the water tank 23 and is used to cool the hot water in the water tank 23 to cope with the situation where the temperature of the cross-cutting roller 11 and the bottom blade beam 12 is too high during the cutting process and needs to be cooled down. The cooling component 243 adopts a partitioned design.

[0063] Specifically, the water tank 23 is equipped with a partition plate, dividing the water tank 23 into a first section and a second section. The first section is connected to the first water circulation component 21 and is used to supply water to the first water circulation channel 211; the second section is connected to the second water circulation component 22 and is used to supply water to the second water circulation channel 221. Each section is equipped with an independent cooling component 243 to achieve cooling of the water in each section.

[0064] The cooling element can be in the form of a cooling coil, through which a cooling medium (such as cooling water, cooling oil, or refrigerant) is circulated. Heat exchange cools the hot water within each zone. The cooling coil is arranged in a spiral or serpentine pattern within the zone to increase the heat exchange area and efficiency. The flow rate of the cooling medium can be controlled by an independent regulating valve, allowing for independent adjustment of the cooling rate in each zone.

[0065] A flow distribution valve 231 is disposed between the first zone, the second zone, and the first water circulation component 21 and the second water circulation component 22, and is used to distribute the water flow into the first water circulation component 21 and the second water circulation component 22 according to the instructions of the control module 4. The flow distribution valve 231 is preferably an electric proportional regulating valve, which can realize continuous adjustment within the range of 0-100% to meet the differentiated cooling requirements under different operating conditions.

[0066] The zoned cooling design allows for hierarchical management of cooling resources based on the thermal load characteristics and cooling requirements of two components. When a component requires rapid cooling, the cooling medium can be centrally allocated to the corresponding zone for efficient cooling. When both components require cooling, the cooling medium flow rate can be rationally allocated based on their respective temperature deviations and thermal loads to achieve optimal configuration of cooling resources.

[0067] Compared to the uniform cooling of all hot water in a single-zone design, the zoned design avoids over-cooling and ineffective cooling, significantly reducing cooling energy consumption. At the same time, the hot water temperature in each zone can be independently adjusted according to demand, allowing for more efficient heat recovery and utilization, aligning with the energy-saving principles of green production.

[0068] In a preferred embodiment of the present invention, the water tank 23 is further provided with a liquid level monitoring sensor 34 and a water temperature monitoring sensor 35. The liquid level monitoring sensor 34 and the water temperature monitoring sensor 35 are respectively connected to the controller and are used for emergency control when the liquid level is lower than the preset value and / or the water temperature exceeds the preset range.

[0069] As the liquid storage and heat exchange container of the entire water circulation system, the liquid level and water temperature of the internal medium in water tank 23 directly affect the normal operation and safety performance of the system. Therefore, a liquid level monitoring sensor 34 and a water temperature monitoring sensor 35 are installed inside water tank 23 to monitor the operating status of water tank 23 at regular intervals.

[0070] A liquid level monitoring sensor 34 is installed on the inner wall of the water tank 23 to periodically detect the liquid level height inside the tank 23. The liquid level monitoring sensor 34 can be a float-type liquid level sensor, a capacitive liquid level sensor, or an ultrasonic liquid level sensor. Preferably, a float-type liquid level sensor is used, which has the advantages of simple structure, high reliability, and low cost. The detection signal from the liquid level monitoring sensor 34 is converted into a standard electrical signal by a signal conversion circuit and then transmitted to the control module 4.

[0071] The installation location of the liquid level monitoring sensor 34 should cover the normal liquid level range and safety threshold of the water tank 23. Typically, two detection points are set: the first detection point is located at the lower limit of the normal liquid level in the water tank 23 to trigger a low liquid level alarm; the second detection point is located at the lowest safe liquid level in the water tank 23 to trigger emergency shutdown protection. When the liquid level drops to the first detection point, the control module 4 issues a low liquid level warning signal to remind the operator to add water in time; when the liquid level drops to the second detection point, the control module 4 immediately activates the emergency control program, stops the operation of the circulating water pump and heating elements, and issues an alarm signal to prevent equipment damage due to water shortage.

[0072] A water temperature monitoring sensor 35 is installed on the inner wall of the water tank 23, preferably in an area where hot water flows sufficiently (such as the bottom or middle of the water tank 23), for periodically detecting the water temperature inside the water tank 23. The water temperature monitoring sensor 35 can be a PT100 resistance temperature detector (RTD) sensor or a thermocouple sensor, featuring high measurement accuracy and fast response speed. The detection signal from the water temperature monitoring sensor 35 is transmitted to the control module 4 for water temperature monitoring and emergency control.

[0073] The detection range of the water temperature monitoring sensor 35 should cover the normal operating temperature range and abnormal temperature threshold of the water tank 23. Two temperature thresholds are typically preset: the first threshold is the highest safe water temperature (e.g., 60℃), and the second threshold is the lowest safe water temperature (e.g., 10℃). When the water temperature exceeds the normal range, the control module 4 issues an early warning or initiates emergency control based on the severity of the deviation.

[0074] During operation, the water level in the water tank 23 will gradually decrease due to evaporation, leakage, or normal consumption. If the water level is too low and not detected and replenished in time, the circulating water pump may draw in air, leading to cavitation, which can damage the pump impeller and reduce flow rate. At the same time, the heating element may dry-burn due to lack of water, causing the heating tube to burn out, or even leading to fire and other safety accidents.

[0075] By setting up a liquid level monitoring sensor 34, the system can monitor the liquid level in the water tank 23 at regular intervals. When the liquid level drops below the safety threshold, it will automatically issue an early warning or shut down for protection, effectively avoiding equipment damage caused by water shortage.

[0076] The water temperature in the water circulation system directly affects the temperature control of the cutting components and the operational safety of the system. If the water temperature is too high, it may accelerate the aging of the circulating water pump seals, shortening their service life; the heating elements may operate at high power for extended periods, increasing energy consumption and the risk of failure; and the vaporization of the circulating water may generate bubbles, affecting heat exchange efficiency and temperature control accuracy. If the water temperature is too low (e.g., during prolonged shutdown in cold environments), it may cause: the circulating water to freeze and expand, damaging pipes and heat exchange components; and the heating elements to require a prolonged period of operation to reach the target temperature during system startup, resulting in a delayed response.

[0077] By setting a water temperature monitoring sensor 35, the system can monitor the water temperature in the water tank 23 at regular intervals. When the water temperature exceeds the preset safe range, it will automatically issue an early warning or start emergency control to ensure that the system always operates within a safe temperature range.

[0078] A second aspect of the present invention provides a method for controlling constant temperature cutting in a plate cutting machine, comprising: Temperature signals of the cross-cutting roller 11 and the bottom blade beam 12 are collected periodically, and cutting force signals between the cross-cutting roller 11 and the bottom blade beam 12 are collected periodically during the cutting process; The temperature signal of the cross-cutting roller 11 is compared with the preset target temperature to obtain the first temperature deviation signal; the temperature signal of the bottom blade beam 12 is compared with the preset target temperature to obtain the second temperature deviation signal; and the cutting force signal is compared with the preset cutting force threshold. Based on the first temperature deviation signal, the water flow rate and / or temperature in the first water circulation component 21 are controlled accordingly, and based on the second temperature deviation signal, the water flow rate and / or temperature in the second water circulation component 22 are controlled accordingly, so as to adjust the temperature of the cross-cutting roller 11 and the bottom blade beam 12. When the cutting force signal exceeds the preset cutting force threshold, the feed speed of the cutting machine is reduced by combining the preset working condition parameters. The preset target temperature is determined based on the temperature of the material being cut, and the preset target temperature corresponding to the cross-cutting roller 11 is lower than that of the bottom blade beam 12.

[0079] Temperature signals of the cross-cutting roller 11 and the bottom blade beam 12 are collected periodically, and cutting force signals between the cross-cutting roller 11 and the bottom blade beam 12 are collected periodically during the cutting process.

[0080] Specifically, a first temperature sensor 31 installed on the cross-cutting roller 11 periodically collects the temperature signal of the cross-cutting roller 11, and a second temperature sensor 32 installed on the bottom cutter beam 12 periodically collects the temperature signal of the bottom cutter beam 12. The temperature sensor's sampling frequency is no less than 10 times / second to ensure the real-time performance and accuracy of the temperature signal, providing a data foundation for subsequent precise control.

[0081] Cutting force data during the cutting process is collected periodically by a cutting force sensor 33 located below the cutting working surface of the bottom cutter beam 12. Cutting force is a core process parameter reflecting changes in cutting conditions, and it most directly reflects information such as material hardness fluctuations, tool wear, and changes in cutting load. The acquisition frequency is also no less than 10 times / second to ensure the real-time nature of the cutting force signal, enabling the system to promptly perceive dynamic changes in the cutting conditions.

[0082] After receiving the temperature signals collected by the first temperature sensor 31 and the second temperature sensor 32, the control module 4 compares and calculates them with the preset target temperature. A temperature deviation signal ΔT is obtained. When ΔT is positive, it indicates that the actual temperature is higher than the target temperature, and cooling needs to be activated; when ΔT is negative, it indicates that the actual temperature is lower than the target temperature, and heating needs to be activated.

[0083] The control module 4 simultaneously receives the cutting force signal collected by the cutting force sensor 33 and compares it with a preset cutting force threshold. The cutting force threshold can be set according to the characteristics of the material being cut, the load-bearing capacity of the tool, and the required cutting accuracy. When the cutting force signal exceeds the preset threshold, it indicates that the cutting load is too large, which may be due to sudden changes in material hardness, accelerated tool wear, or excessively high feed rate, requiring protective measures.

[0084] The control module 4 generates a first control command based on the first temperature deviation signal of the cross-cutting roller 11. By adjusting the speed of the first circulating water pump 212, the opening of the flow distribution valve 231, and the working state of the temperature regulating device 24, the flow rate and temperature of the circulating water entering the first water circulation channel 211 are changed, so that the temperature of the cross-cutting roller 11 returns to the target value.

[0085] Specifically, when the actual temperature of the cross-cutting roller 11 is lower than the target temperature, the control module 4 controls the first circulating water pump 212 to start and increase its speed, thereby increasing the circulating water flow rate. At the same time, the first heating element 241 is activated to heat the circulating water, allowing hot water to enter the first water circulation channel 211 and transfer heat to the cross-cutting roller 11. When the actual temperature is higher than the target temperature, the control module 4 controls the cooling element 243 to work, cooling the hot water in the water tank 23 through the partitioned cooling coil. The hot water flow rate is adjusted by regulating the speed of the first circulating water pump 212 or the opening of the flow distribution valve 231, allowing the cooled hot water to enter the first water circulation channel 211 and carry away the heat from the cross-cutting roller 11.

[0086] Similarly, for the temperature adjustment of the bottom blade beam 12, the control module 4 independently controls the second circulating water pump 222, the second heating element 242 and the corresponding cooling unit based on the second temperature deviation signal of the bottom blade beam 12, so as to achieve independent and precise temperature control of the bottom blade beam 12.

[0087] When the cutting force signal exceeds the preset cutting force threshold, the feed speed of the cutting machine is reduced by combining the preset working condition parameters.

[0088] The control module 4 periodically monitors the signal of the cutting force sensor 33. When the cutting force signal exceeds the preset threshold, it combines the current working condition parameters (such as the type of cutting material and the cutting speed) identified by the working condition identification module to generate a cutting load status signal, and generates a linkage control command accordingly to control and reduce the main feed speed of the cutting machine.

[0089] Under this linkage control mechanism of cutting force and feed rate, firstly, when the cutting force exceeds the threshold, the feed rate is actively reduced, which can effectively reduce the cutting load, avoid excessive tool wear and a sharp increase in cutting temperature, protect the cutting tool and extend its service life.

[0090] Secondly, by reducing the feed rate to lessen the cutting load, the stability of the cutting process can be maintained, avoiding a decrease in cutting accuracy due to sudden load changes and ensuring consistent cutting quality.

[0091] Furthermore, once the cutting force returns to normal, the control module 4 can gradually restore the feed speed to the set value, ensuring both accuracy and cutting efficiency, thus achieving a dynamic balance between accuracy and efficiency.

[0092] This application achieves direct feedback control of the cutting process by periodically monitoring the cutting force and adjusting the feed speed accordingly, which significantly improves the system's adaptability to working conditions and cutting accuracy.

[0093] The preset target temperature is determined based on the temperature of the material being cut, and the preset target temperature corresponding to the cross-cutting roller 11 is lower than the preset target temperature corresponding to the bottom blade beam 12.

[0094] The cross-cutting roller 11 and the bottom blade beam 12 form a fitting gap during the cutting process. If their temperatures are the same, thermal expansion may cause the gap to be too small or even cause interference. Setting the target temperature of the cross-cutting roller 11 lower than that of the bottom blade beam 12 can establish a temperature gradient between them, ensuring that the roller maintains a reasonable fitting gap with the bottom blade beam 12 during rotation.

[0095] Meanwhile, the cross-cutting roller 11 is a rotating component, and its rotational motion itself has a certain heat dissipation capacity and more sufficient contact with air; the bottom crossbeam 12 is a fixed component, and its heat dissipation conditions are relatively poor. Setting target temperatures according to the different motion characteristics and heat dissipation conditions of the two components is beneficial for achieving temperature adaptation.

[0096] For example, when the temperature of the paper web being cut is 35°C, the target temperature of the bottom blade beam 12 can be set to 35°C, and the target temperature of the cross-cutting roller 11 can be set to 33°C. This differentiated setting allows the two components to maintain a reasonable temperature difference during operation, preventing blade spacing fluctuations caused by thermal expansion and contraction, and ensuring the stability of the cutting effect.

[0097] In a preferred embodiment of the present invention, when controlling the water flow rate and / or temperature in the first water circulation component 21 and the second water circulation component 22, an adaptive energy-saving optimization logic is adopted, specifically as follows: Periodically acquire current operating parameters and ambient temperature data; A system energy consumption optimization model is established, with the sum of the energy consumption of the circulating pump and the energy consumption of the temperature regulation device 24 as the objective function and the temperature control accuracy as the constraint condition. Based on the current operating parameters and ambient temperature data, the system energy consumption optimization model is used to solve for the combination of operating parameters, which includes the circulating pump flow rate and temperature regulation power. Based on the combination of operating parameters, control commands are output to the circulating pump and temperature regulating device 24 to make them operate according to the combination of operating parameters.

[0098] The control module 4 periodically acquires the current cutting condition parameters through the working condition identification module. These parameters include at least the type of material being cut, the hardness of the material, the cutting speed, and the cutting thickness. Simultaneously, ambient temperature data, including workshop temperature and humidity, is periodically collected by environmental temperature sensors located around the cutting machine.

[0099] Operating parameters and ambient temperature data are key factors in determining the system's heat load requirements. When the hardness of the cutting material increases, the cutting speed increases, or the ambient temperature rises, the heat load on the cutting components increases accordingly, requiring a higher circulating water flow rate or stronger cooling capacity to maintain the target temperature. Conversely, when the cutting material is softer, the cutting speed is lower, or the ambient temperature is lower, the heat load decreases, and the circulating water flow rate or heating / cooling power can be appropriately reduced to save energy.

[0100] The control module 4 has a built-in system energy consumption optimization model. The model takes the sum of the energy consumption of the circulating pump and the energy consumption of the temperature regulation device 24 as the objective function and the temperature control accuracy as the constraint.

[0101] The expression for the objective function is: , in, The energy consumption of the circulating pump includes the sum of the energy consumption of the first circulating water pump and the second circulating water pump. Energy consumption of the temperature control device includes the heating energy consumption of the heating element and the cooling energy consumption of the cooling element.

[0102] The constraint is the temperature control accuracy requirement: , in, The maximum allowable temperature deviation is set to ±0.5℃ in this embodiment. This implementation achieves quantitative optimization by establishing a mathematical optimization model of the objective function and constraints.

[0103] The control module 4 uses the system energy consumption optimization model to solve for the combination of operating parameters based on the current operating condition parameters and ambient temperature data acquired at regular intervals. The combination of operating parameters includes the circulation pump flow rate and temperature regulation power.

[0104] First, based on operating parameters and ambient temperature data, predict the system's current heat load demand. This can be achieved through experimental data fitting or machine learning methods, with a pre-trained neural network model being preferred for heat load prediction.

[0105] Secondly, under the constraint of temperature control accuracy, we need to find the combination of circulating pump flow rate and temperature regulation power that minimizes total energy consumption. This is a multivariate optimization problem, which can be solved using the following methods: Gradient descent method calculates the gradient of the objective function with respect to the control variables and iteratively searches for the optimal solution along the gradient descent direction; The enumeration optimization method discretizes and enumerates the feasible region of the circulating pump flow rate and temperature regulation power, calculates the energy consumption value of each combination, and selects the combination with the lowest energy consumption. This method is suitable for situations with few variables and a small feasible region. Intelligent optimization algorithms, such as genetic algorithms and particle swarm optimization, are suitable for situations with many variables and complex constraints.

[0106] The control module 4 outputs control commands to the circulating pump and temperature regulating device 24 based on the optimal combination of operating parameters obtained from the solution, so that they operate according to the optimal combination of operating parameters.

[0107] Specifically, when the optimal combination of operating parameters indicates a reduction in the flow rate of the circulating pump, the control module 4 reduces the operating frequency of the first circulating water pump 212 and / or the second circulating water pump 222 through the frequency converter, thereby reducing power consumption.

[0108] When the optimal combination of operating parameters indicates an increase in temperature regulation power, the control module 4 controls the heating element to increase heating power or the cooling element 243 to increase the flow rate of cooling medium.

[0109] When the optimal combination of operating parameters indicates a reduction in temperature regulation power, control module 4 correspondingly reduces the output of heating or cooling.

[0110] As a preferred option, the strategy for correcting the combination of operating parameters is further optimized by employing adaptive fuzzy compensation logic to correct the combination of operating parameters, specifically as follows: Obtain the current operating condition parameters, which include at least the type of material to be cut and the cutting speed; Based on the operating parameters, the correction coefficients of the control parameters are determined using a preset fuzzy rule base; The correction factor is applied to the current operating parameters to generate the corrected operating parameters; Based on the modified combination of operating parameters, the control output for flow rate and / or temperature is obtained.

[0111] The system automatically identifies the type (such as cardboard, plastic sheet, thin metal sheet, etc.), hardness grade, thickness, and other parameters of the material to be cut through user input, barcode scanning, or a visual recognition system. Different materials have significant differences in thermal conductivity, specific heat capacity, and cutting characteristics, and therefore require different temperature control systems.

[0112] The main control system of the cutting machine acquires the rotational speed and feed speed of the cross-cutting roller 11 in real time. The cutting speed directly determines the cutting friction heat and heat load requirements per unit time.

[0113] In addition, operating parameters may also include the thickness of the material being cut, the initial temperature of the material, and the wear condition of the cutting tool, without any restrictions. These parameters together constitute a complete picture of the cutting conditions, providing input for subsequent fuzzy inference.

[0114] Based on the acquired operating parameters, control module 4 determines the correction coefficients for the control parameters using a preset fuzzy rule base. The control parameters include at least the proportional gain coefficient Kp, integral gain coefficient Ki, and derivative gain coefficient Kd, used to correct the output of the PID controller.

[0115] The fuzzy rule base is pre-built based on expert experience and experimental data, storing the mapping relationship between operating parameters and PID parameter correction coefficients. An example of the fuzzy rule base in this embodiment is as follows:

[0116] When the cutting material has high hardness and the cutting speed is fast, the system heat load changes drastically, requiring a larger proportional gain to improve the response speed, while an appropriate derivative gain is needed to suppress overshoot; when the cutting material has low hardness and the cutting speed is slow, the system operating conditions are relatively stable, and a smaller gain can be used to avoid over-adjustment.

[0117] The collected operating parameters (such as material hardness and cutting speed) are converted into fuzzy linguistic variables using membership functions. For example, the cutting speed can be divided into three fuzzy sets: low speed, medium speed, and high speed. Each set corresponds to a membership function, which describes the degree to which the current speed belongs to each set.

[0118] Based on the fuzzified input variables, matching and inference are performed in the fuzzy rule base to determine the fuzzy value of the output variable (i.e., the PID correction coefficient). Commonly used inference methods include the Mamdani inference method and the Takagi-Sugeno inference method; this embodiment preferably uses the Mamdani inference method.

[0119] The fuzzy output values ​​obtained from inference are converted into precise correction coefficient values. Commonly used defuzzification methods include the centroid method, the maximum membership method, and the weighted average method. This embodiment preferably uses the centroid method because of its high computational accuracy and smooth output.

[0120] Control module 4 applies the correction coefficients (ΔKp, ΔKi, ΔKd) obtained after defuzzification to the current operating parameters to generate the corrected operating parameters. The corrected PID parameters are calculated as follows: , , , in, , , The basic PID parameters are α, β, and γ, which are correction strength coefficients (usually ranging from 0.1 to 0.5) used to control the magnitude of the correction and avoid overcorrection that could cause system oscillation.

[0121] The revised PID parameters reflect the specific requirements of the control system under the current operating conditions. For example, when cutting high-hardness materials, The corresponding increase makes the system more sensitive to temperature deviations; when the cutting speed changes drastically, The corresponding increase is made to suppress temperature overshoot and oscillation.

[0122] Based on the corrected combination of operating parameters, the control module calculates the control output for the water flow rate and / or temperature in the first and second water circulation components. Specifically, the output of the PID controller is: , Where e(t) is the temperature deviation signal (the difference between the actual temperature and the target temperature).

[0123] After being limited and converted, the output is used to generate specific control commands: for the circulating pump, a frequency signal is output to adjust the motor speed, thereby changing the circulating water flow rate; for the heating element, a PWM (pulse width modulation) signal is output to adjust the heating power; for the cooling element 243, a control signal is output to the flow distribution valve 231 to adjust the flow rate of the cooling medium entering each zone.

[0124] Preferably, the method for setting the initial parameters of the adaptive fuzzy compensation logic further includes an error memory correction function, specifically: Record historical temperature control deviation data under different operating conditions and parameters. The historical temperature control deviation data includes at least one of temperature overshoot, steady-state error, and response time. Statistical analysis was performed on historical temperature control deviation data under the same cutting conditions to generate optimization correction coefficients corresponding to the cutting conditions. When the same operating parameters are identified again, the optimized correction coefficient is used as the initial correction coefficient of the adaptive fuzzy compensation logic.

[0125] The control module 4 has a built-in memory for recording historical temperature control deviation data under different operating conditions. The historical temperature control deviation data includes at least one of temperature overshoot, steady-state error, and response time.

[0126] Specifically, after each temperature control cycle is completed, control module 4 records the following data: Operating condition identification, a combination code of operating condition parameters such as cutting material type, cutting speed, and ambient temperature; Temperature overshoot occurs when the actual temperature first exceeds the maximum deviation from the target temperature. Steady-state error is the average deviation between the actual temperature and the target temperature after the system enters steady state. Response time is the time required from the occurrence of temperature deviation to the actual temperature first entering the range of ±0.5℃ from the target temperature. Adjustment count: The number of times the PID parameters were adjusted under this operating condition.

[0127] These data are indexed by combinations of operating parameters and stored in the database of control module 4, forming an operating condition-deviation mapping table.

[0128] The control module 4 performs statistical analysis on the historical temperature control deviation data under the same cutting condition parameters and generates the optimization correction coefficient corresponding to the cutting condition parameters.

[0129] Statistical analysis methods can be adopted in the following ways: The weighted average method calculates a weighted average of multiple temperature control data under the same operating conditions. The more historical data, the lower the weight can be to reflect the learning maturity of the system. Least square fitting: If there is enough historical data under the same working condition (e.g., more than 10), the least square method can be used to fit the functional relationship between the correction coefficient and the temperature control effect, and find the optimal correction coefficient that minimizes the steady-state error. For high-dimensional operating spaces, Bayesian optimization algorithms can be used to globally optimize the correction coefficients. This method fits the objective function using a Gaussian process surrogate model, achieving a balance between exploration and utilization, and can find near-global optimal correction coefficients in a relatively small number of iterations.

[0130] When the control module 4 identifies the same operating condition parameters as those in the historical records again through the operating condition identification module, the generated optimized correction coefficients are used as the initial correction coefficients of the adaptive fuzzy compensation logic and are directly applied to the current temperature control process.

[0131] Specifically, when the system detects that the current operating condition parameter matches a certain operating condition parameter in the historical record, the control module 4 directly calls the optimization correction coefficient corresponding to that operating condition as the initial value for fuzzy rule base inference or as the direct correction value for the PID parameter, thus avoiding the process of adjusting from zero.

[0132] This mechanism, through the reuse of historical experience and its self-learning error control method, can effectively reduce machining errors and improve the machining accuracy of complex parts.

[0133] It should be noted that the error memory correction function also includes a dynamic update mechanism. After each temperature control process is completed, control module 4 compares the actual effect of this temperature control with the expected effect: If the actual overshoot, steady-state error, and response time of this temperature control are all better than the historical average, then the temperature control parameters and correction coefficients of this time will be added to the historical database, and statistical analysis will be performed again to update and optimize the correction coefficients. If the temperature control effect is worse than the historical average, analyze the reasons for the deviation (such as sudden environmental changes, changes in equipment status, etc.). If it is due to accidental factors, do not update the optimization correction coefficient; if it is due to systematic deviation, adjust the optimization correction coefficient accordingly.

[0134] In addition, the control module 4 can also be set up with a forgetting mechanism to give time-sensitive weight to historical data, so that the system pays more attention to recent operating data and adapts to long-term change trends such as equipment aging.

[0135] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0136] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0137] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A constant temperature cutting system for a plate cutting machine, characterized in that, include: The cutting execution module (1) includes a cross-cutting roller (11) and a bottom cross-beam (12). The water circulation module (2) includes a first water circulation component (21) for adjusting the temperature of the cross-cutting roller (11) and a second water circulation component (22) for adjusting the temperature of the bottom blade crossbeam (12). The cross-cutting roller (11) is provided with a first water circulation channel (211), and the bottom blade crossbeam (12) is provided with a second water circulation channel (221). The first water circulation channel (211) is connected to the first circulating water pump (212) to form the first water circulation assembly (21), and the second water circulation channel (221) is connected to the second circulating water pump (222) to form the second water circulation assembly (22). The water circulation module (2) also includes a water tank (23), which is connected to the first water circulation component (21) and the second water circulation component (22) through a flow distribution valve (231) to distribute water. And a temperature regulating device (24) to regulate the water temperature supplied to the first water circulation assembly (21) and the second water circulation assembly (22); The system also includes, The detection module (3) includes a first temperature sensor (31) disposed on the cross-cutting roller (11), a second temperature sensor (32) disposed on the bottom crossbeam (12), and a cutting force sensor (33). The control module (4) is electrically connected to the first temperature sensor (31), the second temperature sensor (32), and the cutting force sensor (33), respectively. It generates a first temperature deviation signal based on the signal from the first temperature sensor (31) to control the water flow rate and / or temperature within the first water circulation component (21). A second temperature deviation signal is generated based on the signal from the second temperature sensor (32) to control the water flow rate and / or temperature within the second water circulation component (21). The cutting load status signal is generated based on the cutting force sensor (33) signal and the preset working condition parameters, which is used to control the feed speed of the cutting machine.

2. The system according to claim 1, characterized in that, The first water circulation channel (211) includes a first water inlet end disposed at any one end of the cross-cutting roller (11) in the axial direction, and a first water outlet end disposed at the other end of the cross-cutting roller (11) in the axial direction. From the water inlet to the water outlet, the first water circulation channel (211) extends spirally within the cross-cutting roller (11).

3. The system according to claim 2, characterized in that, The first water circulation channel (211) is provided with a plurality of inwardly protruding guide ridges (2111), which are curved in an arc shape toward the first water outlet end.

4. The system according to claim 1, characterized in that, The temperature regulating device (24) includes a first heating element (241) and a second heating element (242). The first heating element (241) is used for heating the water in the first water circulation assembly (21); The second heating element (242) is used for heating the water in the second water circulation assembly (22).

5. The system according to claim 4, characterized in that, The temperature regulating device (24) also includes a plurality of cooling components (243) disposed in the water tank (23). The water tank (23) is configured with a first partition corresponding to the first water circulation component (21) and a second partition corresponding to the second water circulation component (22). Water is distributed to the first water circulation component (21) and the second water circulation component (22) through a flow distribution valve (231). Some of the cooling components (243) are disposed in the first partition and some of the cooling components (243) are disposed in the second partition to achieve partition water cooling.

6. The system according to claim 1, characterized in that, The water tank (23) is also equipped with a liquid level monitoring sensor (34) and a water temperature monitoring sensor (35). The liquid level monitoring sensor (34) and the water temperature monitoring sensor (35) are respectively connected to the controller and are used for emergency control when the liquid level is lower than the preset value and / or the water temperature exceeds the preset range.

7. A method for controlling constant temperature cutting in a plate cutting machine, characterized in that, include: Temperature signals of the cross-cutting roller (11) and the bottom blade beam (12) are collected periodically, and cutting force signals between the cross-cutting roller (11) and the bottom blade beam (12) are collected periodically during the cutting process; The temperature signal of the cross-cutting roller (11) is compared with the preset target temperature to obtain the first temperature deviation signal; the temperature signal of the bottom crossbeam (12) is compared with the preset target temperature to obtain the second temperature deviation signal; the cutting force signal is compared with the preset cutting force threshold. According to the first temperature deviation signal, the water flow rate and / or temperature in the first water circulation component (21) are controlled accordingly, and according to the second temperature deviation signal, the water flow rate and / or temperature in the second water circulation component (22) are controlled accordingly, so as to adjust the temperature of the cross-cutting roller (11) and the bottom blade beam (12). When the cutting force signal exceeds the preset cutting force threshold, the feed speed of the cutting machine is reduced by combining the preset working condition parameters. The preset target temperature is determined based on the temperature of the plate being cut, and the preset target temperature corresponding to the cross-cutting roller (11) is lower than that of the bottom blade beam (12).

8. The method according to claim 7, characterized in that, When controlling the water flow rate and / or temperature in the first water circulation component (21) and the second water circulation component (22), an adaptive energy-saving optimization logic is adopted, specifically as follows: Periodically acquire current operating parameters and ambient temperature data; Establish a system energy consumption optimization model. The system energy consumption optimization model takes the sum of the energy consumption of the circulating pump and the energy consumption of the temperature regulation device (24) as the objective function and the temperature control accuracy as the constraint condition. Based on the current operating parameters and ambient temperature data, the system energy consumption optimization model is used to solve for the combination of operating parameters, which includes the circulating pump flow rate and temperature regulation power. Based on the combination of operating parameters, control commands are output to the circulating pump and temperature regulating device (24) to make them operate according to the combination of operating parameters.

9. The method according to claim 8, characterized in that, It also includes using adaptive fuzzy compensation logic to correct the combination of operating parameters, specifically: Obtain the current operating condition parameters, which include at least the type of material to be cut and the cutting speed; Based on the operating parameters, the correction coefficients of the control parameters are determined using a preset fuzzy rule base; The correction factor is applied to the current operating parameters to generate the corrected operating parameters; Based on the modified combination of operating parameters, the control output for flow rate and / or temperature is obtained.

10. The method according to claim 9, characterized in that, It also includes an error memory correction function, specifically: Record historical temperature control deviation data under different operating conditions and parameters. The historical temperature control deviation data includes at least one of temperature overshoot, steady-state error, and response time. Statistical analysis was performed on historical temperature control deviation data under the same cutting conditions to generate optimization correction coefficients corresponding to the cutting conditions. When the same operating parameters are identified again, the optimized correction coefficient is used as the initial correction coefficient of the adaptive fuzzy compensation logic.

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