CN116001225A - Electric heating rotational molding process and control system thereof - Google Patents
Electric heating rotational molding process and control system thereof Download PDFInfo
- Publication number
- CN116001225A CN116001225A CN202310003148.XA CN202310003148A CN116001225A CN 116001225 A CN116001225 A CN 116001225A CN 202310003148 A CN202310003148 A CN 202310003148A CN 116001225 A CN116001225 A CN 116001225A
- Authority
- CN
- China
- Prior art keywords
- temperature
- heating
- plc
- mold
- die
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Moulding By Coating Moulds (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The application relates to an electric heating rotational molding process and a control system thereof, wherein the electric heating rotational molding process comprises the following steps: s1, electrifying and ventilating; s2, injection molding, namely opening a mold, injecting powder into a mold cavity of the mold, and closing the mold; s3, heating, namely setting heating temperature and heating time, heating, plasticizing and shaping the powder in the die; s4, preserving heat, namely, after the heating time is up, reducing the temperature in the die to a preset preserving temperature, and maintaining the preserving temperature to preserve heat of the product; s5, cooling, namely starting air cooling equipment to cool the product after the heat preservation time is reached; s6, demolding, detecting the temperature of the product, and opening the mold to eject the product when the temperature of the product is cooled down to 80-85 ℃ to finish demolding. The electric heating rotational molding control system controls the whole process, realizes the automatic control of the rotational molding process, saves the labor cost and effectively improves the production efficiency.
Description
Technical Field
The application relates to the field of rotational molding technology, in particular to an electric heating rotational molding technology and a control system thereof.
Background
The rotational moulding process is that plastic material is first added into mould, then heated and rotated along two vertical axes, and the plastic material in the mould is coated and fused to the whole surface of the mould cavity gradually and homogeneously under the action of gravity and heat energy to form the required shape, and finally cooled to form the product.
At present, the traditional rotational molding process generally adopts a natural gas furnace as a heating device, the traditional natural gas furnace has lower heating efficiency and the material is heated unevenly in a mold; a few factories heat materials in a die through heating wires, but an electric heating device is usually controlled manually by a person, so that the electric heating device cannot be controlled accurately, and automatic control of various procedures such as heating the die, putting in the materials, demolding and the like in the rotational molding process is difficult to realize; in summary, the lower degree of automation and the defects in the production process result in lower overall production efficiency of the rotomolding process.
Disclosure of Invention
In order to improve the production efficiency of a rotational molding process, the application provides an electric heating rotational molding process and a control system thereof.
According to the technical scheme, the electric heating rotational molding process comprises the following steps of:
s1, electrifying and ventilating, and switching on a power supply and compressed air for the electric heating rotational molding device;
s2, injection molding, namely opening a mold, and injecting powder into a mold cavity of the mold according to preset product proportions to close the mold;
s3, heating, setting heating temperature and heating time, heating, plasticizing and shaping powder in the die according to the set heating temperature and heating time;
s4, preserving heat, namely, after the heating time is up, reducing the temperature in the die to a preset preserving heat temperature, and maintaining the preserving heat temperature to preserve heat of the product;
s5, cooling, stopping heating after the heat preservation time is reached, detecting the temperature in the die, and starting air cooling equipment to cool the product when the temperature in the die reaches 140 ℃;
s6, demolding, namely detecting the temperature of the product, and opening the mold to eject the product when the temperature of the product is cooled down to 80-85 ℃, so as to finish demolding.
By adopting the technical scheme, the whole process of the rotational molding process is controlled by the PLC, and operators only need to complete simple operations such as batching and the like, so that the production efficiency of the rotational molding process is greatly improved; the method is used for adopting an automatic control flow, and simultaneously saves labor cost.
Preferably, the step S3 specifically includes the following steps:
raising the temperature in the die to a first temperature threshold and maintaining for a first preset time;
after reaching the first preset time, the temperature in the die is increased from a first temperature threshold to a second temperature threshold and is kept for the preset time;
and after reaching a second preset time, raising the temperature in the die from a second temperature threshold to the heating temperature.
By adopting the technical scheme, the method of sectional heating is adopted when the die is heated, so that powder is completely melted and uniformly distributed in the die cavity, and the product quality is improved.
In a second aspect, the present application provides an electric heating rotational molding control system, which adopts the following technical scheme, and the control system includes a data input module, an instruction output module and a PLC controller;
the data input module comprises:
the data output end of the temperature sensor is coupled with the data input end of the PLC and is used for detecting the current real-time temperature of the die;
the mold opening and closing button is coupled to the data input end of the PLC and used for transmitting a mold opening or closing instruction to the PLC;
the emergency stop switch is coupled to the data input end of the PLC and used for cutting off the power supply under emergency conditions to ensure safety;
the starting switch is coupled to the data input end of the PLC and used for starting the system;
the instruction output module includes:
the heating wire relay is coupled to the instruction output end of the PLC, and the heating wires are uniformly distributed on the outer surface of the die and used for heating the die;
the air cooling equipment relay is used for controlling the start and stop of the air cooling equipment;
the mold opening and closing motor is used for controlling the mold to be opened or closed;
the air compressor relay is used for controlling the start and stop of the air compressor, and the air compressor can be used for introducing compressed gas into the die to enable the product to be demolded;
the data input modules are all coupled with the data input ports of the PLC, the instruction output modules are all coupled with the data output ports of the PLC, and the PLC is used for receiving and processing the data transmitted by the data input modules and transmitting instructions to the instruction output modules so as to realize automatic control of the system.
By adopting the technical scheme, the PLC is adopted to control all equipment related to the rotational molding process, so that artificial variables in the production process are eliminated, the production flow is carried out according to the set optimal process, and the product quality is ensured; the labor cost is reduced, and one operator can control a plurality of moulds simultaneously, so that the product cost is reduced.
Preferably, the PLC controller is further coupled with a PLC upper computer, and the PLC upper computer is coupled with an information input unit and a capacitive touch screen.
By adopting the technical scheme, operators set and control the rotational molding process through the capacitive touch screen and the information input unit, so that the production efficiency is improved; the PLC upper computer is arranged to complete data collection and display of the technical process, so that an operator can conveniently monitor the technical process.
Preferably, the PLC upper computer is in communication connection with the PLC controller through a wireless network.
Through adopting above-mentioned technical scheme for PLC host computer can set up in optional position, makes things convenient for personnel to operate.
Preferably, the starting switch is a fingerprint on-off machine, and the fingerprint on-off machine is used for recording fingerprint information of an operator and transmitting the fingerprint information of the operator to the PLC upper computer for operator identity verification.
By adopting the technical scheme, the identity recognition of the operator is finished, the operator is guaranteed to have relevant operation qualification, and the product quality and production safety are guaranteed.
Preferably, the PLC upper computer further comprises a report recording unit, wherein the report recording unit is used for recording operation information, and the operation information comprises the heating time and the heating temperature of the die, the heat preservation time and the heating temperature of the die, operator information and electric energy consumption information.
By adopting the technical scheme, the whole operation process is recorded, so that the product has trace and responsibility and can be traced, and the management and the improvement of the quality of the produced product are facilitated.
Preferably, the data input end of the PLC is further coupled with a smart meter, the smart meter communicates with the PLC through an RS485 serial port, and the smart meter is used for recording the electric energy consumption of the system.
Through adopting above-mentioned technical scheme, through the electric energy consumption record of smart electric meter to all kinds of equipment in the electrical heating rotational moulding technology overall process, make the managers can in time master the production condition, optimize technological process energy service condition, be of value to the energy saving.
In summary, the present application includes at least one of the following beneficial technical effects:
1. compared with the traditional rotational molding process, the traditional rotational molding die has higher production efficiency, the traditional rotational molding die is heated by the oven and then conducts heat to the die, the energy loss is high in the heating process by the medium heating of hot air, and the electric heating wire directly heats the die, so that the energy loss is reduced, and the production efficiency is improved;
2. the PLC control system is adopted to automatically control the whole production process, so that the labor cost is reduced, meanwhile, the process is more stable through automatic control, and the variable factors in production are reduced.
Drawings
Fig. 1 is a process flow diagram of an electrically heated rotational molding process according to an embodiment of the present application.
Fig. 2 is a system block diagram of a control system for an electrically heated rotational molding process in accordance with an embodiment of the present application.
Fig. 3 is a schematic diagram of a control system of an electrically heated rotational molding process according to another embodiment of the present application.
Reference numerals illustrate: 1. a PLC controller; 2. a data input module; 21. a temperature sensor; 22. a mold opening and closing button; 23. a timer; 24. starting a switch; 25. a smart meter; 3. an instruction output module; 31. a heating wire relay; 32. a mold opening and closing motor; 33. an air cooling device relay; 34. an air compressor relay; 4. a PLC upper computer; 41. a report recording unit; 42. an information input unit; 43. a capacitive touch screen.
Detailed Description
In order to make the technical solutions in the present specification better understood by those skilled in the art, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.
The embodiment of the application discloses an electric heating rotational molding process.
Referring to fig. 1, an electric heating rotational molding process includes the steps of:
s1: the ventilation and the energization are carried out, and a power supply and compressed air are connected to the electric heating rotational molding device;
specifically, an operator starts the power supply of the electric heating rotational molding device and the control system through a power supply start button to supply power to the device so as to prepare for the rotational molding process; simultaneously, an air compressor is started to ventilate the inside of the die, so as to prepare for the demolding procedure in the rotational molding process.
The power supply starting button is specifically a fingerprint machine, an operator needs to input identity information and fingerprint information in advance, before rotational molding process operation is carried out, the fingerprint is input at the fingerprint machine, the fingerprint machine transmits personnel fingerprint information to the PLC upper computer for personnel identity verification, the identity verification of personnel is the prior art, the description is omitted again, and when the verification passes, the electric heating rotational molding device is started.
S2: injection molding, namely opening a mold, injecting powder into a mold cavity of the mold according to preset product proportions, and closing the mold;
specifically, the operator clicks the mold opening and closing button, the auxiliary hinge and the sliding rail which are arranged on the control cylinder and the mold and used for opening the mold open the mold, the operator adds powder with a certain proportion into the mold cavity of the mold according to the actual product produced, and clicks the mold opening and closing button again to close the mold. In one embodiment of the present application, the product is a polyethylene hydrogen cylinder liner, the mold is opened, 40 mesh polyethylene powder is added into the mold cavity, and the mold is closed.
S3: heating, setting heating temperature and heating time, heating, plasticizing and shaping powder in a mold according to the set heating temperature and heating time;
specifically, an operator sets heating temperature and heating time through an information input unit coupled with the PLC upper computer, and the information input unit is a keyboard; after the setting is completed, the PLC controls the electric heating wire to work, and the die is heated. In another embodiment of the present application, an operator directly sets a temperature through a capacitive touch screen coupled to the PLC host computer, the capacitive touch screen displays a virtual key for temperature rise and temperature drop and a set temperature value, after the temperature setting is completed, the PLC controller controls heating power of the heating wire to change the temperature in the mold, the temperature sensor monitors the temperature in the mold in real time, feeds back the acquired temperature information to the PLC controller, displays a temperature curve and a current system temperature value on the capacitive touch screen set on the PLC host computer, and the resolution of the adjustment of the virtual key to the temperature is 1 ℃.
The work of the heating wire is completely controlled by the PLC controller, in the embodiment of the application, the heating process is carried out in stages, the produced product is a hydrogen cylinder, an operator sets the heating temperature to 250 ℃, the heating time is set to 15min, at this moment, the PLC controller firstly controls the heating wire to raise the temperature of the die to 150 ℃ within 5min, the temperature of the die is continuously raised to 250 ℃ after the heating wire is maintained for 5min, and the heating temperature is maintained for the remaining 5min until the heating time is finished; in the heating process, a temperature sensor arranged on the die monitors the temperature state of the die in real time, and feeds back the acquired temperature information to a PLC controller, and the PLC adjusts the temperature by controlling the power of the heating wire.
S4: after the heating time is reached, the temperature in the die is reduced to a preset heat preservation temperature, and the heat preservation temperature is maintained to preserve the heat of the product;
specifically, after the heating stage is finished, the PLC controls the heating wire to reduce the temperature to the heat preservation temperature, so that powder in the die fully covers the inner wall of the die cavity, and the heating wire maintains the heat preservation temperature until the heat preservation stage is finished; in one embodiment of the present application, the product is a hydrogen cylinder, the holding time is set to 3min, and the holding temperature is 200 ℃.
In another embodiment of the present application, in order to fully implement automatic control, save manual operation flows, and preset operation flows of different products in the PLC controller, where the operation flows have been set to a product heating temperature, a heating time, a heat preservation temperature, and a heat preservation time, an operator only needs to select a product to be produced when producing the product, and the system automatically sets corresponding parameters and controls the heating wire to complete the heating and heat preservation procedure.
S5: cooling, stopping heating after the heat preservation time is reached, detecting the temperature in the die, and starting air cooling equipment to cool the product when the temperature in the die reaches 140 ℃;
specifically, after the heat preservation process is finished, the PLC controller controls the heating wire to stop heating the die, the die is waited for to cool naturally, the temperature sensor continuously detects the temperature of the die, when the temperature is detected to be reduced to 140 ℃, the PLC controller controls the air cooling equipment to start air cooling and cooling the die, and the air cooling equipment can be a fan.
S6: demolding, namely detecting the temperature of the product, opening the mold to eject the product when the temperature of the product is cooled down to 80-85 ℃, and finishing demolding;
specifically, when the temperature sensor detects that the temperature is reduced to 80-85 ℃, the die is opened, the PLC controls the air top arranged below the die cavity to allow compressed gas to be introduced into the die, and under the action of the compressed gas, the product is ejected out to finish demoulding.
The implementation principle of the electric heating rotational molding process in the embodiment of the application is as follows:
the method comprises the steps of switching on power supply and air compressor gases for electric heating rotational molding equipment and a control system, opening a die, injecting corresponding powder into a die cavity of the die according to actual products, setting heating temperature and time on a PLC (programmable logic controller) upper computer after the die is closed, heating the powder according to the set heating temperature, heating the powder in a step-by-step mode, reducing heating wire power to keep the temperature of the product at a relatively low temperature after the set heating temperature and time are reached, enabling the product to be naturally cooled by the heat-preserving time, starting air cooling equipment to quickly cool the product after the product is cooled to a certain temperature, pumping compressed gas after the product is cooled to the certain temperature, and controlling a gas cap to finish demoulding of the product.
The embodiment of the application also discloses a control system of the electric heating rotational molding process.
Referring to fig. 2, an electric heating rotational molding control system includes a data input module 2, an instruction output module 3 and a PLC controller 1, wherein the data input module 2 includes a temperature sensor 21, a mold opening and closing button 22, a timer 23, a scram switch and a start switch 24, the instruction output module 3 includes an electric heating wire relay 31, an air cooling device relay 33, a mold opening and closing motor 32 and an air compressor relay 34, the data input module 2 is coupled to a data input port of the PLC controller 1, the instruction output module 3 is coupled to a data output port of the PLC controller 1, and the PLC controller 1 is used for receiving and processing data transmitted by the data input module 2 and then transmitting instructions to the instruction output module 3, so as to realize automatic control of the system.
Specifically, the data output end of the temperature sensor 21 is coupled to the data input end of the PLC controller 1, the temperature sensor 21 may be PT100 or PT1000, the temperature probe of the temperature sensor 21 is inserted into the mold, the current temperature of the mold is monitored in real time and the temperature value is sent to the PLC controller 1, the temperature measuring range of the temperature sensor 21 is 0-300 ℃, the resolution is 1 ℃, and the temperature is collected every 1 s.
The mold opening and closing button 22 is a pneumatic switch, and is coupled to the data input end of the PLC controller 1, and is used for transmitting a mold opening instruction to the PLC controller 1, when the mold opening and closing button 22 is pressed, the PLC controller 1 receives the mold opening instruction, and the PLC controller 1 controls the cylinder to start to work, and opens the mold through an auxiliary hinge and a sliding rail on the mold.
The emergency stop switch is used for directly stopping the system in an emergency, the starting switch 24 is specifically a fingerprint switch, the identity of an operator can send the fingerprint information of the operator to the PLC controller 1, the PLC controller 1 sends the fingerprint information to the PLC upper computer 4, and the identity verification is carried out in the PLC upper computer 4 according to the received fingerprint information of the operator; the emergency stop switch and the start switch 24 are both coupled to the data input terminal of the PLC controller 1.
The heating wire is arranged on the outer surface of the die, the heating power of the heating wire continuously and uniformly surrounds the outer surface of the die, the heating power of the heating wire is controlled by the heating wire relay 31, and the heating wire relay 31 is coupled to the data output end of the PLC controller 1 and receives the control of the PLC controller 1.
The air cooling device relay 33 is coupled to the instruction output end of the PLC controller 1, and when receiving the fan start instruction sent by the PLC controller 1, the air cooling device relay 33 falls down to control the air cooling device to be turned on, and the air cooling device is specifically a fan and is used for rapidly cooling the mold in the cooling process.
The mold opening and closing motor 32 is coupled to the command output end of the PLC controller 1, and is used for controlling the opening and closing of the mold.
The air compressor relay 34 can control the air compressor to introduce compressed gas into the die, and after cooling of the product is finished, the air compressor is controlled to introduce compressed gas into the lower part of the die, so that the air jack jacks the product out of the die.
In an embodiment of the present application, the PLC controller 1 is further connected with a PLC host computer 4, the PLC controller 1 and the PLC host computer 4 are connected through a wireless network to implement information interaction, various data input into the PLC controller 1 by the data input module 2 can be processed on the PLC host computer 4, and after a series of processing and judging, an instruction is generated and output, and the instruction output module 3 is controlled to perform an action. The PLC host computer 4 is coupled with a capacitive touch screen 43 and an information input unit 42, where the capacitive touch screen 43 can perform man-machine interaction with an operator, and can be used for adjusting heating temperature and time, keeping temperature and time, displaying a working temperature curve, displaying the status and power consumption of each working device of the system, and the information input unit 42 is specifically a keyboard.
The PLC upper computer 4 comprises a report recording unit 41, when the control system starts to work, the PLC controller 1 sends the acquired data part to the PLC upper computer 4, the PLC upper computer 4 sorts the data to generate a data report, and the data report can reflect the working states of operators and the system, so that the follow-up monitoring and management are convenient; the data include, but are not limited to, heating temperature and time data, heat preservation temperature and time data, operator identity information obtained by fingerprint startup and shutdown, startup and shutdown time of a control system, and power consumption statistical data, wherein the power consumption statistical data can be obtained by a three-phase four-wire time-sharing smart meter 25, the smart meter 25 communicates with the PLC controller 1 through an RS485 communication line in a serial port, and the communication protocol is based on the modbus rtu protocol.
In another embodiment of the present application, the apparatus further includes a self-checking unit, and before the control system controls the electric heating rotational molding device to perform the rotational molding process, the self-checking unit performs fault detection on the control system and related equipment, and the specific steps of self-checking are as follows: detecting whether the communication between the PLC controller 1 and the PLC upper computer 4 is normal, specifically, the PLC controller 1 sends a test signal to the PLC upper computer 4, judging whether a response returned by the PLC upper computer 4 is received or not, and if not, displaying that the connection fails; detecting whether the temperature sensor 21 works normally or not, setting the number of channels of the temperature sensor 21 by an operator, and controlling signal lamps corresponding to the channels of the temperature sensor 21 to flash if the temperature sensor 21 does not respond; detecting whether electric leakage occurs, and if so, controlling the electric leakage warning lamp to flash.
After the self-checking unit completes self-checking on the control system, the rotational molding process can be started, if the system fails in the self-checking process, an operator is waited to repair the failure, and the system is started after the self-checking is passed again.
In another embodiment of the present application, a USB interface is further provided on the PLC host 4, and when it is detected that the USB interface is inserted into the local USB disk, the operation report generated by the report recording unit 41 is automatically imported into the local USB disk, and the imported data is updated once at intervals of 10 s.
The implementation principle of the electric heating rotational molding control system in the embodiment of the application is as follows:
the PLC controller 1 is used as a control core, various process data transmitted by the data input module 2 are received, the processing and judgment of the various process data are finished in the PLC controller 1 or the PLC upper computer 4, each unit in the instruction output module 3 is controlled to work according to various process data output instructions, and an operator can set parameters of each stage of the process through the PLC upper computer 4. The automatic control of the electric heating rotational molding process is realized, various unstable factors caused by personnel operation are effectively avoided, and the product quality is improved; the adoption of automatic control also greatly reduces the labor cost, and effectively improves the production efficiency.
Referring to fig. 3, in another embodiment of the present application, in order to make the heating efficiency of the heating wire on the mold higher and ensure that the mold is heated uniformly, a covering layer is further wrapped on the outer surface of the mold, the covering layer is an alloy shell with the same shape as the mold, a gap space between the covering layer and the outer surface of the mold is a heat conducting oil cavity, the heat conducting oil cavity is filled with heat conducting oil, the heating wire is arranged in the heat conducting oil cavity, the heat conducting oil cavity is communicated with one end of an oil outlet valve through an oil way, the other end of the oil outlet valve is communicated with one end of a heat conducting oil tank for storing oil, the other end of the heat conducting oil tank is communicated with one end of a numerical control circulating oil pump for driving the heat conducting oil to circulate, the other end of the numerical control circulating oil pump is communicated with one end of an oil inlet valve, the other end of the oil inlet valve is led into the heat conducting oil cavity to form a circulation loop, the oil inlet valve and the oil outlet valve are both electrohydraulic valves and controlled by a PLC controller 1, and a temperature sensor 21 is arranged in the heat conducting oil cavity to detect the real-time temperature of the heat conducting oil; the cover plate fixedly connected to the rotating shaft of the die is arranged on the cover layer, and the cover plate is arranged to enable the device to rotate only in the heating and heat preservation process and the cover layer is fixed, so that the heating wire heats the die through heating heat conducting oil when the die is subjected to rotational molding.
The oil inlet valve, the oil outlet valve and the electric control circulating oil pump are all coupled to the instruction output end of the PLC controller 1, and the temperature sensor 21 is coupled to the data input end of the PLC controller 1; when the temperature sensor 21 detects that the heat conduction oil is heated to the heating temperature set by the operator, the heating process is performed at the moment, and the heat emitted by the heating wire uniformly acts on the outer surface of the die by taking the heat conduction oil as a conduction medium, so that the powder in the die can be heated more uniformly; when the temperature sensor 21 detects that the heat conduction oil is heated to a set heat preservation temperature by the heating wire, the PLC controller 1 controls the oil outlet valve to be opened, the heat conduction oil heated to the set heating temperature by the heating wire in the heat conduction oil cavity is discharged to the oil tank, meanwhile, the numerical control circulating oil pump is started, the numerical control circulating oil pump fills the heat conduction oil with slightly lower temperature in the heat conduction oil tank into the heat conduction oil cavity through the oil inlet valve by negative pressure, and the heat conduction oil circulation is completed, in the process, the temperature sensor 21 collects the current heat conduction oil temperature in real time, and after the heat preservation temperature is reached, the oil outlet valve, the numerical control circulating oil pump and the oil inlet valve are closed, and meanwhile, the heating wire is controlled to maintain the heat conduction oil temperature at the heat preservation temperature; and after the heat preservation process is finished, opening the oil outlet valve again, and pumping out the heat conduction oil in the heat conduction oil cavity to the oil tank, wherein the oil inlet valve is kept in a closed state.
Through above-mentioned conduction oil circulation process, be favorable to the even heating of heating wire to mould, avoided energy loss, be favorable to improving production efficiency.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. An electric heating rotational molding process, which is characterized by comprising the following steps:
s1, electrifying and ventilating, and switching on a power supply and compressed air for the electric heating rotational molding device;
s2, injection molding, namely opening a mold, and injecting powder into a mold cavity of the mold according to preset product proportions to close the mold;
s3, heating, setting heating temperature and heating time, heating, plasticizing and shaping powder in the die according to the set heating temperature and heating time;
s4, preserving heat, namely, after the heating time is up, reducing the temperature in the die to a preset preserving heat temperature, and maintaining the preserving heat temperature to preserve heat of the product;
s5, cooling, stopping heating after the heat preservation time is reached, detecting the temperature in the die, and starting air cooling equipment to cool the product when the temperature in the die reaches 140 ℃;
s6, demolding, namely detecting the temperature of the product, and opening the mold to eject the product when the temperature of the product is cooled down to 80-85 ℃, so as to finish demolding.
2. An electrically heated rotational moulding process according to claim 1, characterised in that in step S3 it comprises in particular the following steps:
raising the temperature in the die to a first temperature threshold and maintaining for a first preset time;
after reaching the first preset time, the temperature in the die is increased from a first temperature threshold to a second temperature threshold and is kept for the preset time;
and after reaching a second preset time, raising the temperature in the die from a second temperature threshold to the heating temperature.
3. A control system based on an electric heating rotational moulding process according to any of claims 1-2, characterized in that it comprises a data input module (2), a command output module (3) and a PLC controller (1);
the data input module (2) comprises:
a temperature sensor (21), wherein a data output end of the temperature sensor (21) is coupled with a data input end of the PLC (1) and is used for detecting the current real-time temperature of the die;
the mold opening and closing button (22) is coupled to the data input end of the PLC (1) and is used for transmitting a mold opening or closing instruction to the PLC (1);
the emergency stop switch is coupled to the data input end of the PLC (1) and used for cutting off the power supply in case of emergency so as to ensure safety;
-a start switch (24), the start switch (24) being coupled to a data input of the PLC controller (1) for starting the system;
the instruction output module (3) includes:
the heating wire relay (31) is coupled to the instruction output end of the PLC (1), and the heating wires are uniformly distributed on the outer surface of the die and used for heating the die;
an air cooling device relay (33), wherein the air cooling device relay (33) is used for controlling the start and stop of the air cooling device;
a mold opening and closing motor (32) for controlling the mold to be opened or closed;
the air compressor relay (34) is used for controlling the start and stop of the air compressor, and compressed gas can be introduced into the air compressor like the die to enable the product to be demolded;
the data input modules (2) are all coupled to the data input ports of the PLC (1), the instruction output modules (3) are all coupled to the data output ports of the PLC (1), and the PLC (1) is used for receiving and processing data transmitted by the data input modules (2) and transmitting instructions to the instruction output modules (3) so as to realize automatic control of a system.
4. A control system for an electrically heated rotomolding process in accordance with claim 3, wherein:
the PLC controller (1) is also coupled with a PLC upper computer (4), and the PLC upper computer (4) is coupled with an information input unit (42) and a capacitive touch screen (43).
5. The control system for an electrically heated rotational molding process of claim 4, wherein:
the PLC upper computer (4) is in communication connection with the PLC controller (1) through a wireless network.
6. The control system for an electrically heated rotational molding process of claim 4, wherein:
the starting switch (24) is a fingerprint on-off machine, and the fingerprint on-off machine is used for recording fingerprint information of an operator and transmitting the fingerprint information of the operator to the PLC upper computer (4) for checking the identity of the operator.
7. The control system for an electrically heated rotational molding process of claim 4, wherein:
the PLC upper computer (4) also comprises a report recording unit (41), wherein the report recording unit (41) is used for recording operation information, and the operation information comprises the mold heating time and temperature, the mold heat preservation time and temperature, operator information and electric energy consumption information.
8. The control system for an electrically heated rotational molding process of claim 4, wherein:
the intelligent electric energy consumption system is characterized in that the data input end of the PLC (1) is further coupled with an intelligent electric meter (25), the intelligent electric meter (25) is communicated with the PLC (1) through an RS485 serial port, and the intelligent electric meter (25) is used for recording the electric energy consumption of the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310003148.XA CN116001225A (en) | 2023-01-03 | 2023-01-03 | Electric heating rotational molding process and control system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310003148.XA CN116001225A (en) | 2023-01-03 | 2023-01-03 | Electric heating rotational molding process and control system thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116001225A true CN116001225A (en) | 2023-04-25 |
Family
ID=86033349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310003148.XA Pending CN116001225A (en) | 2023-01-03 | 2023-01-03 | Electric heating rotational molding process and control system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116001225A (en) |
-
2023
- 2023-01-03 CN CN202310003148.XA patent/CN116001225A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101834983B1 (en) | Control system for tooling | |
| CN101249715A (en) | Electrical heating type temperature control device for high-gloss injection mold | |
| CN114179320A (en) | Automatic adjusting method for technological parameters of injection molding machine in combination with visual detection | |
| CN116001225A (en) | Electric heating rotational molding process and control system thereof | |
| CN109878045B (en) | Control device for intelligently adjusting constant pressure and accurate control of mold cavity | |
| CN112248204A (en) | One-to-multiple fixed die table concrete precast slab maintenance system and maintenance method | |
| KR20080104595A (en) | Rapid heating and rapid cooling mold system and it's control method | |
| CN103192055B (en) | A kind of control system of multiple sliding block die casting machine and control method thereof | |
| CN205767419U (en) | Cold material feeding pin bolt formula extruder temperature automaton | |
| CN108284585A (en) | A kind of inflation film manufacturing machine automatically controls film blowing method | |
| CN108145933A (en) | Plastic mould nonstorage calorifier | |
| CN201192891Y (en) | Electrical heating temperature control device of high light injection mold | |
| CN219456783U (en) | Concrete temperature control system | |
| CN211054342U (en) | Mould detection workstation | |
| CN205601113U (en) | Shaping auxiliary system of injection moulding mould | |
| CN112856218B (en) | Automatic flow control and protection method based on liquid oxygen flow regulation | |
| CN108454045A (en) | A kind of plastic mould nonstorage calorifier | |
| CN207509707U (en) | Cross-head and mold preheating system | |
| CN109910254B (en) | Temperature control system for high-temperature gas circulation of injection mold cavity | |
| CN210270597U (en) | PLC-based multi-path temperature centralized inspection device for shoe machine | |
| CN102744844A (en) | Highlight die and temperature control system thereof | |
| CN105835340A (en) | Intelligent control system for door seal extrusion process | |
| CN102233658A (en) | Extruding machine for nine-layer co-extrusion high-obstruction film blow molding machine | |
| CN106598093B (en) | Extra quality tank dual temperature control Redundant backup low temperature temperature control system and its control method | |
| CN109591256A (en) | A kind of injection mold for sensor outer housing production |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |