CN111890619A - Sectional heating system for plastic calendering roller and control method thereof - Google Patents
Sectional heating system for plastic calendering roller and control method thereof Download PDFInfo
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- CN111890619A CN111890619A CN202010882255.0A CN202010882255A CN111890619A CN 111890619 A CN111890619 A CN 111890619A CN 202010882255 A CN202010882255 A CN 202010882255A CN 111890619 A CN111890619 A CN 111890619A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a sectional heating system for plastic calendering rollers, wherein a plurality of calendering rollers are arranged on a plastic calendering machine, and a roller of each calendering roller is divided into a plurality of annular heating areas with adjacent sections; the annular heating areas are respectively and independently provided with a heating device and a temperature measuring sensor for measuring the temperature of each section of the annular heating area, the heating devices are connected with a heating control panel, a plurality of heating control panels are arranged, are configured with the heating devices in a set and are connected in a one-to-one correspondence manner through heating electric collecting rings; the temperature measuring sensor is connected with the temperature controller through a temperature measuring signal collecting ring, and the heating control panel is connected with the temperature controller through a signal wire. The invention also provides a control method of the sectional heating system for the plastic calendering roller. The invention not only effectively improves the control of the temperature of the plastic calender roll, but also controls the temperature difference between the middle and two ends of the calender roll within the required range, thereby solving the problems of three high and two low when the plastic calender equipment produces the film (sheet).
Description
Technical Field
The invention relates to the field of calendering rollers, in particular to a sectional heating system for a plastic calendering roller and a control method thereof.
Background
The plastic calendering process is one widely used mode for producing plastic film (sheet). The thermoplastic plastic is extruded from the gap between two calender rolls of the plastic calender to form a thin sheet (film) with uniform thickness, as shown in fig. 1 (101 in fig. 1 is raw material, 102 is calender roll, and 103 is finished product). When the calendering roller works, the calendering roller bears a large separating force, the separating force enables the calendering roller to generate flexural deformation like a planted beam, and the deformation value is expanded from the middle point of the roller axis at the maximum deflection position to two ends and gradually reduced, so that the phenomenon that the middle of the calendered film is thick and two sides of the calendered film are thin in the transverse direction is caused. In order to overcome the phenomenon of nonuniform transverse thickness of a rolled film caused by roller deformation, the rigidity of the roller is improved from the aspects of material selection, structural design and the like, and roller deflection compensation measures such as a 'middle-high method', 'shaft crossing method' and a 'prestress method' can be adopted during the design of a calender to theoretically solve the phenomenon of deflection deformation.
However, the traditional calendering roller is heated transversely, the temperature difference existing in the axial direction of the roller during operation is affected by the cooling of lubricating oil at the bearing positions at the two sides of the roller and the fact that the roller is not coated, and the two ends of the roller are easier to dissipate heat than the middle part, so that the two ends of a calendering roller processing area are inconsistent with the middle temperature, the temperature of the center of the roller is high, and the temperatures of the two sides are low, as shown in fig. 2. Because the deviation of the temperature affects the stability of the plastic processing, the following problems are caused: (1) because the two ends of the roller are easier to radiate heat than the middle part, the temperature at the two ends of the roller is lower than that at the middle part, and the radial thermal expansion amount of the low-temperature area on the roller is small, the axial roller gap value is greatly changed, and the thickness of the two sides of the film in the transverse direction is increased; meanwhile, when the film (sheet) is stripped and stretched, the part of the calendering roller with high temperature is drawn and thinned, and the phenomenon of thick edge of the plastic film (sheet) in the calendering process can also be caused; (2) because the material in the roller gap of the calender moves, the material with high temperature moves towards the material with low temperature, and the flow pattern phenomenon on the surface of the sheet is generated; (3) causing fatal defects of three high and two low (two sides and equal high) of rolled plastic film (sheet) products.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sectional heating system for a plastic calendering roller and a control method thereof, the invention divides the calendering roller into a plurality of areas from the middle to the two ends of the calendering roller, and respectively carries out independent temperature heating and control for sectional heating, thereby not only effectively improving the control of the temperature of the plastic calendering roller, but also controlling the temperature difference between the middle and the two ends of the calendering roller within the required range, and solving the problem of three-high two-low which can not be solved by plastic calendering film (sheet) product machine equipment.
According to one aspect of the invention, a segmented heating system for a plastic calendering roller is provided, wherein a plurality of calendering rollers (1) are arranged on the plastic calendering roller, and a roller barrel of each calendering roller (1) is divided into a plurality of annular heating areas (2) with adjacent sections; the annular heating areas (2) are respectively and independently provided with a heating device (3) and a temperature measuring sensor (4) for measuring the temperature of each section of the annular heating area (2), the heating devices (3) are connected with a heating control board (8), a plurality of heating control boards (8) are arranged, are configured with the heating devices (3) in a set and are connected with the heating electric collecting rings (5) in a one-to-one corresponding mode; the temperature measuring sensor (4) is connected with the temperature controller (7) through a temperature measuring signal collecting ring (6), and the heating control panel (8) and the temperature controller (7) are arranged in the heating control cabinet and are connected through a signal line.
The heating and temperature measuring devices of each section of the annular heating area (2) are respectively configured into a set independently, each set of heating and temperature measuring device comprises a heating device (3), a temperature measuring sensor (4), a temperature controller (7) and a heating control panel (8), and the rotating calendering roller is electrically connected with a fixed control cabinet through a heating electric collecting ring (5) and a temperature measuring signal collecting ring (6); install heating device (3) on the calendering roller of rotatory running state and be connected through each passageway and heating control panel (8) of heating electricity collecting ring (5) and form the control closed loop, temperature measurement sensor (4) are connected with temperature controller (7) through each passageway and the formation control closed loop of temperature measurement signal collecting ring (6), accomplish rotatory/fixed connection conversion through the collecting ring, realize electrical connection, and signal communication in the system can select to pass through wireless transmission communication or light signal transmission communication, and transmission mode is various, can be nimble changeable according to the in-service use condition, satisfies multiple user demand, and the practicality is strong.
Preferably, the heating device (3) is an electric heating device or an electromagnetic induction heating device. The electric heating device is simple and convenient to heat, and the electromagnetic induction heating device has the advantages of long service life and stable and reliable operation.
In order to achieve the above object, the present invention further provides a control method for a sectional heating system of a plastic calendering roll, comprising the following steps:
step one, the heating control panel (8) provides power for the heating device (3) through the heating electric collecting ring (5), and each section of annular heating area (2) of each calendering roller (1) of the plastic calender starts to be heated;
secondly, the temperature measuring sensors (4) respectively acquire the actual temperature of each section of the annular heating area (2), and transmit temperature signals to the temperature controller (7) through the temperature measuring signal collecting rings (6);
reading the received temperature signal by the temperature controller (7), comparing and analyzing the identified actual temperature of each section of annular heating area (2) on each calendering roller (1) with the preset temperature, and sending a heating adjustment instruction to the heating control board (8) through control operation according to the actual temperature value and the temperature change condition;
fourthly, the heating control panel (8) controls the heating device (3) to adjust the heating electric power of the corresponding annular heating area (2) through the heating electric collecting ring (5) according to the heating adjustment instruction, and the corresponding annular heating area (2) performs corresponding temperature adjustment;
and step five, re-detecting and starting the next cycle.
Preferably, the heating adjustment instruction is:
when the actual temperature of the annular heating area (2) on each calendering roller (1) is lower than the preset temperature, the temperature controller (7) sends a command of increasing the heating electric power to a heating control board (8) connected with the heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) is heated and heated;
when the actual temperature of the annular heating area (2) on each calendering roller (1) is higher than the preset temperature, the temperature controller (7) sends a command of reducing heating electric power to a heating control board (8) connected with a heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) is cooled;
when the actual temperature of the annular heating area (2) on each calendering roller (1) is equal to the preset temperature, the temperature controller (7) sends a command for maintaining the current heating electric power to a heating control board (8) connected with the heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) maintains the current temperature.
Preferably, the preset temperature of each section of the annular heating area (2) on the calendering roll (1) is in a curvilinearly descending trend from the annular heating area (2) in the middle of the calendering roll (1) to the annular heating areas (2) at two ends of the calendering roll (1). Namely, the preset temperature of the annular heating area (2) in the middle of the calendering roll (1) is higher than the preset temperature of the annular heating areas (2) at the two ends of the calendering roll (1). Because the material in the roller clearance of film (piece) in the calendering molding process constantly rolls over from the centre of roller and flows to roller both ends, and the material in the middle of the roller is thick promptly, the thin at both ends, therefore the heating region is the curvilinearly decline from the middle of roller to the both ends difference in temperature, can thoroughly solve the uneven problem of film (piece) lateral thickness. And the section that three high appear in the roller in the calendering molding process, can set up the preset temperature that increases this section in the temperature controller, control heating device and raise the temperature of this heating zone, in the section of two low, reduce the preset temperature of this section, control heating device and reduce the temperature of this heating zone, make the film (sheet) of the section that the roller temperature rises in the calendering molding process thin, the film (sheet) of the section that the temperature reduces thickens, thus has solved the uneven problem of lateral thickness of film (sheet) thoroughly.
Preferably, the preset temperatures of the symmetrical annular heating areas (2) at the two ends of the calendering roller (1) are the same. Because the symmetric areas at the left and right ends of the calendering roller are affected by the lubricating oil in the bearing in the same way, and the materials in the roller gap of the film (sheet) in the calendering molding process continuously roll from the middle of the roller to flow to the two ends of the roller, the temperatures of the symmetric areas at the left and right ends of the roller are generally the same, and can be adjusted simultaneously when adjusting the temperatures, so that the signal line or the communication channel for connecting the electromagnetic wire and the controller can be reduced, and the cost is reduced.
The working principle is as follows: each section of annular heating area of each calendering roller on the plastic calender is independently heated and independently temperature-measured, and if 1 calendering roller is divided into n sections of annular heating areas, n heating devices and n temperature-measuring sensors are arranged on the calendering roller, and n pairs of heating connecting wires, n temperature-measuring signal wires and collecting ring channels with the same number as the heating connecting wires and the temperature-measuring signal wires are arranged on the calendering roller; the temperature measurement signal collecting ring is used for transmitting a temperature signal measured on the calendering roller in a rotating working state to a temperature controller arranged in a heating control cabinet, and the temperature controller carries out analysis operation on the received measured temperature and sends a heating adjustment instruction to the annular heating areas of the respective sections; the heating control panel adjusts the heating power of the heating devices of each section according to the heating adjustment instruction, and controls the temperature of the annular heating area of the corresponding section; the heating electric collecting ring transmits the heating electric energy output by the heating control panel to the heating device on the rotating calendering roller, and controls the corresponding annular heating area to carry out corresponding temperature adjustment.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention relates to a sectional heating system for a plastic calendering roller and a control method thereof, which improve the integral heating mode of the traditional calendering roller, divide the processing area of the calendering roller into a plurality of sections, and independently heat and control each section, and is different from the conventional heating of the calendering roller (the conventional heating of the calendering roller is that the whole calendering roller only has one set of heating device, integrally heats the calendering roller, and can not solve the problem of uneven temperature of the middle and two ends of the surface of the calendering roller), and the temperature of the middle and two ends of the surface of the calendering roller is respectively controlled, thereby solving the problem of uneven temperature of each area of the surface of the calendering roller;
(2) the sectional heating system for the plastic calendering roller and the control method thereof carry out sectional heating, can effectively improve the control of the temperature of the plastic calendering roller, set the temperature of the thick part of a sheet material to be high, set the temperature of the thin part to be low, and control the temperature difference between the middle part and the two ends of the calendering roller within the required range, so that the processing temperature of the whole calendering roller can be kept consistent, thereby not only solving the problem of flow lines on the sheet surface, but also solving the problem of three-high two-low which can not be solved by plastic calendering equipment;
(3) the invention relates to a sectional heating system for a plastic calendering roller and a control method thereof.A roller is divided into a plurality of annular heating areas with adjacent sections for longitudinal heating, the temperature of each section on the whole roller can be more conveniently controlled compared with the traditional transverse heating, and the consistency of the temperature of two ends and the middle temperature of a calendering roller processing area is ensured;
(4) the sectional heating system for the plastic calendering roller and the control method thereof have the advantages of simple system, ingenious design and obvious effect;
(5) the invention relates to a sectional heating system for a plastic calendering roller and a control method thereof.A heating device adopts an electric heating device or an electromagnetic induction heating device, so that the sectional heating system is more energy-saving, and compared with the calendering roller which adopts heat-conducting oil for heating, the energy consumption can be reduced by 40 percent, and the sectional heating system adopts electric energy and is clean, so that the pollution of the heat-conducting oil to plastic products is avoided;
(6) the sectional heating system for the plastic calendering roller and the control method thereof are easy to process and assemble, stable and reliable in operation, convenient to operate, low in cost, strong in practicability and suitable for large-scale popularization.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a plastic calender roll;
FIG. 2 is a schematic view of the temperature distribution in the processing zone of a plastic calender roll;
FIG. 3 is a schematic view of the construction of a calender roll in the staged heating system for plastic calender rolls of the present invention;
FIG. 4 is a schematic view of the assembly connections of the staged heating system for plastic calendering rolls according to the invention;
FIG. 5 is a schematic graphical comparison of conventional heating and product thickness produced using the segmented heating system of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
The embodiment provides a sectional heating system for a plastic calendering roller, and the assembly connection schematic diagram is shown in the attached figure 4: a plurality of calendering rollers 1 are arranged on the plastic calender, and the roller of each calendering roller 1 is divided into a plurality of annular heating areas 2 with adjacent sections (the structure of each annular heating area is shown in a detailed figure 3); the annular heating areas 2 are respectively and independently provided with a heating device 3 and a temperature measuring sensor 4 for measuring the temperature of each section of the annular heating area 2, the heating devices 3 are connected with a heating control board 8, and a plurality of heating control boards 8 are arranged, are configured in a set with the heating devices 3 and are connected in a one-to-one correspondence manner through heating electric collecting rings 5; the temperature measuring sensor 4 is connected with the temperature controller 7 through the temperature measuring signal collecting ring 6, and the heating control panel 8 and the temperature controller 7 are arranged in the heating control cabinet and are connected through a signal wire.
The heating and temperature measuring devices of each section of the annular heating area 2 are respectively configured into a set independently, each set of heating and temperature measuring device comprises a heating device 3, a temperature measuring sensor 4, a temperature controller 7 and a heating control panel 8, and the rotating calendering roller is electrically connected with a fixed control cabinet through a heating electric collecting ring 5 and a temperature measuring signal collecting ring 6; install heating device 3 on the calendering roller of rotatory running state and be connected with heating control panel 8 through each passageway of heating electricity collecting ring 5 and form the control closed loop, temperature sensor 4 is connected with temperature controller 7 through each passageway of temperature measurement signal collecting ring 6 and is formed the control closed loop, accomplishes rotatory/fixed connection conversion through the collecting ring, realizes electrical connection, and signal communication in the system can select through wireless transmission communication or light signal transmission communication, and transmission mode is various, can be nimble changeable according to the in-service use condition, satisfies multiple user demand, and the practicality is strong.
Further, the heating device 3 is an electric heating device or an electromagnetic induction heating device. The electric heating device is simple and convenient to heat, and the electromagnetic induction heating device has the advantages of long service life and stable and reliable operation.
In a second aspect, the present embodiment further provides a control method for a staged heating system for plastic calendering rolls, comprising the following steps:
step one, the heating control panel 8 provides power for the heating device 3 through the heating electric collecting ring 5, and each section of annular heating area 2 of each calendering roller 1 of the plastic calender starts to be heated;
secondly, the temperature measuring sensor 4 respectively acquires the actual temperature of each section of the annular heating area 2 and transmits a temperature signal to the temperature controller 7 through the temperature measuring signal collecting ring 6;
step three, the temperature controller 7 reads the received temperature signal, compares and analyzes the identified actual temperature of each section of the annular heating area 2 on each calendering roller 1 with the preset temperature, and sends a heating adjustment instruction to the heating control board 8 through control operation according to the actual temperature value and the temperature change condition;
fourthly, the heating control board 8 controls the heating device 3 to adjust the heating electric power of the corresponding annular heating area 2 through the heating electric collecting ring 5 according to the heating adjustment instruction, and the corresponding annular heating area 2 carries out corresponding temperature adjustment;
and step five, re-detecting and starting the next cycle.
Further, the heating adjustment instruction is:
when the actual temperature of the annular heating area 2 on each calendering roller 1 is lower than the preset temperature, the temperature controller 7 sends an instruction for increasing the heating electric power to a heating control board 8 connected with the heating device 3 in the annular heating area 2, and the corresponding annular heating area 2 is heated and heated;
when the actual temperature of the annular heating area 2 on each calendering roller 1 is higher than the preset temperature, the temperature controller 7 sends a command of reducing heating electric power to a heating control board 8 connected with the heating device 3 in the annular heating area 2, and the corresponding annular heating area 2 is cooled;
when the actual temperature of the annular heating area 2 on each calendering roller 1 is equal to the preset temperature, the temperature controller 7 sends an instruction for maintaining the current heating electric power to the heating control board 8 connected with the heating device 3 in the annular heating area 2, and the corresponding annular heating area 2 maintains the current temperature.
Furthermore, the preset temperature of each section of the annular heating area 2 on the calendering roll 1 is in a curvilinearly descending trend from the annular heating area 2 in the middle of the calendering roll 1 to the annular heating areas 2 at the two ends of the calendering roll 1. Namely, the preset temperature of the annular heating area 2 in the middle of the calendering roll 1 is higher than the preset temperature of the annular heating areas 2 at the two ends of the calendering roll 1. Because the material in the roller clearance of film (piece) in the calendering molding process constantly rolls over from the centre of roller and flows to roller both ends, and the material in the middle of the roller is thick promptly, the thin at both ends, therefore the heating region is the curvilinearly decline from the middle of roller to the both ends difference in temperature, can thoroughly solve the uneven problem of film (piece) lateral thickness. And the section that three high appear in the roller in the calendering molding process, can set up the preset temperature that increases this section in the temperature controller, control heating device and raise the temperature of this heating zone, in the section of two low, reduce the preset temperature of this section, control heating device and reduce the temperature of this heating zone, make the film (sheet) of the section that the roller temperature rises in the calendering molding process thin, the film (sheet) of the section that the temperature reduces thickens, thus has solved the uneven problem of lateral thickness of film (sheet) thoroughly.
Further, the preset temperatures of the symmetrical annular heating areas 2 at the two ends of the calendering roller 1 are the same. Because the symmetric areas at the left and right ends of the calendering roller are affected by the lubricating oil in the bearing in the same way, and the materials in the roller gap of the film (sheet) in the calendering molding process continuously roll from the middle of the roller to flow to the two ends of the roller, the temperatures of the symmetric areas at the left and right ends of the roller are generally the same, and can be adjusted simultaneously when adjusting the temperatures, so that the signal line or the communication channel for connecting the electromagnetic wire and the controller can be reduced, and the cost is reduced.
The working principle is as follows: each section of annular heating area of each calendering roller on the plastic calender is independently heated and independently temperature-measured, and if 1 calendering roller is divided into n sections of annular heating areas, n heating devices and n temperature-measuring sensors are arranged on the calendering roller, and n pairs of heating connecting wires, n temperature-measuring signal wires and collecting ring channels with the same number as the heating connecting wires and the temperature-measuring signal wires are arranged on the calendering roller; the temperature measurement signal collecting ring is used for transmitting a temperature signal measured on the calendering roller in a rotating working state to a temperature controller arranged in a heating control cabinet, and the temperature controller carries out analysis operation on the received measured temperature and sends a heating adjustment instruction to the annular heating areas of the respective sections; the heating control panel adjusts the heating power of the heating devices of each section according to the heating adjustment instruction, and controls the temperature of the annular heating area of the corresponding section; the heating electric collecting ring transmits the heating electric energy output by the heating control panel to the heating device on the rotating calendering roller, and controls the corresponding annular heating area to carry out corresponding temperature adjustment.
Experiments prove that the product thickness uniformity prepared by the segmented heating system is improved, as shown in fig. 5, a curve 9 is a schematic curve of the traditional heating mode, namely three high, two low caused by uneven roll surface temperature; the curve 10 is a temperature schematic curve for controlling the temperature of the surface of the calendering roller in sections by adopting the sectional heating system, the roller has three high sections in the calendering molding process, the preset temperature of the section is increased, the heating device is controlled to increase the temperature of the heating area, the preset temperature of the section is reduced in the two low sections, the heating device is controlled to reduce the temperature of the heating area, and the product thickness is compensated by adjusting the temperature; the curve 11 is a schematic thickness curve of a product obtained after temperature compensation is performed by using the sectional heating system of the invention, and as can be seen from the curve 11, the film (sheet) in the section where the temperature of the roller is increased becomes thinner and the film (sheet) in the section where the temperature is decreased becomes thicker in the calendering molding process, so that the uniformity of the thickness of the product is greatly improved, and analysis shows that the sectional heating system of the invention thoroughly solves the problem of nonuniform transverse thickness of the film (sheet).
The embodiment has the following beneficial effects:
(1) the integral heating mode of the traditional calendering roller is improved, the processing area of the calendering roller is divided into a plurality of sections, each section is independently heated and controlled, and the problem of non-uniform temperature of the middle and two ends of the surface of the calendering roller cannot be solved by integrally heating the calendering roller (the conventional heating of the calendering roller is that the whole calendering roller only has one set of heating device, and the temperature of the middle and two ends of the surface of the calendering roller is respectively controlled), so that the problem of non-uniform temperature of each area of the surface of the calendering roller is solved;
(2) the sectional heating is carried out, the temperature control of the plastic calender roll can be effectively improved, the temperature of the thick part of the sheet is set to be high, the temperature of the thin part of the sheet is set to be low, and the temperature difference between the middle part and the two ends of the calender roll is controlled within the required range, so that the processing temperature of the whole calender roll can be kept consistent, the problem of flow lines on the sheet surface is solved, and the problem of three-high two-low which can not be solved by plastic calender equipment is solved;
(3) the roller is divided into a plurality of annular heating areas with adjacent sections for longitudinal heating, so that the temperature of each section on the whole roller can be more conveniently controlled compared with the traditional transverse heating, and the consistency of the temperatures of two ends and the middle of a calendering roller processing area is ensured;
(4) the system is simple, the design is ingenious, and the effect is obvious;
(5) the heating device adopts an electric heating device or an electromagnetic induction heating device, so that the energy is saved, compared with a calendering roller which adopts heat conduction oil for heating, the energy consumption can be reduced by 40 percent, and the heating device adopts electric energy and is clean, so that the pollution of the heat conduction oil to plastic products is avoided;
(6) the device is easy to process and assemble, stable and reliable in operation, convenient to operate, low in cost, high in practicability and suitable for large-scale popularization.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. The sectional heating system for the plastic calendering rollers is characterized in that a plurality of calendering rollers (1) are arranged on the plastic calendering roller, and a roller of each calendering roller (1) is divided into a plurality of annular heating areas (2) with adjacent sections; the annular heating areas (2) are respectively and independently provided with a heating device (3) and a temperature measuring sensor (4) for measuring the temperature of each section of the annular heating area (2), the heating devices (3) are connected with a heating control board (8), a plurality of heating control boards (8) are arranged, are configured with the heating devices (3) in a set and are connected with the heating electric collecting rings (5) in a one-to-one corresponding mode; the temperature measuring sensor (4) is connected with the temperature controller (7) through a temperature measuring signal collecting ring (6), and the heating control panel (8) and the temperature controller (7) are arranged in the heating control cabinet and are connected through a signal line.
2. The staged heating system for plastic calendering rolls according to claim 1, wherein the heating device (3) is an electric heating device or an electromagnetic induction heating device.
3. A control method of a sectional heating system for a plastic calendering roller is characterized by comprising the following steps:
step one, the heating control panel (8) provides power for the heating device (3) through the heating electric collecting ring (5), and each section of annular heating area (2) of each calendering roller (1) of the plastic calender starts to be heated;
secondly, the temperature measuring sensors (4) respectively acquire the actual temperature of each section of the annular heating area (2), and transmit temperature signals to the temperature controller (7) through the temperature measuring signal collecting rings (6);
reading the received temperature signal by the temperature controller (7), comparing and analyzing the identified actual temperature of each section of annular heating area (2) on each calendering roller (1) with the preset temperature, and sending a heating adjustment instruction to the heating control board (8) through control operation according to the actual temperature value and the temperature change condition;
fourthly, the heating control panel (8) controls the heating device (3) to adjust the heating electric power of the corresponding annular heating area (2) through the heating electric collecting ring (5) according to the heating adjustment instruction, and the corresponding annular heating area (2) performs corresponding temperature adjustment;
and step five, re-detecting and starting the next cycle.
4. The method of claim 3, wherein the heating adjustment instructions are:
when the actual temperature of the annular heating area (2) on each calendering roller (1) is lower than the preset temperature, the temperature controller (7) sends a command of increasing the heating electric power to a heating control board (8) connected with the heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) is heated and heated;
when the actual temperature of the annular heating area (2) on each calendering roller (1) is higher than the preset temperature, the temperature controller (7) sends a command of reducing heating electric power to a heating control board (8) connected with a heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) is cooled;
when the actual temperature of the annular heating area (2) on each calendering roller (1) is equal to the preset temperature, the temperature controller (7) sends a command for maintaining the current heating electric power to a heating control board (8) connected with the heating device (3) in the annular heating area (2), and the corresponding annular heating area (2) maintains the current temperature.
5. The control method of the sectional heating system for the plastic calendering roll according to the claim 4, wherein the preset temperature of each section of the annular heating area (2) on the calendering roll (1) is in a curve descending trend from the annular heating area (2) in the middle of the calendering roll (1) to the annular heating areas (2) at the two ends of the calendering roll (1).
6. The control method of the staged heating system for plastic calendering rolls according to claim 5, wherein the preset temperatures of the symmetrical annular heating zones (2) at both ends of the calendering roll (1) are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010882255.0A CN111890619A (en) | 2020-08-28 | 2020-08-28 | Sectional heating system for plastic calendering roller and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010882255.0A CN111890619A (en) | 2020-08-28 | 2020-08-28 | Sectional heating system for plastic calendering roller and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117246039A (en) * | 2023-10-26 | 2023-12-19 | 浙江京华激光科技股份有限公司 | Infrared heating's moulding roller group and mould pressing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117246039A (en) * | 2023-10-26 | 2023-12-19 | 浙江京华激光科技股份有限公司 | Infrared heating's moulding roller group and mould pressing equipment |
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