CN214773926U - Temperature control circuit of plastic extruding machine - Google Patents
Temperature control circuit of plastic extruding machine Download PDFInfo
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- CN214773926U CN214773926U CN202121478655.1U CN202121478655U CN214773926U CN 214773926 U CN214773926 U CN 214773926U CN 202121478655 U CN202121478655 U CN 202121478655U CN 214773926 U CN214773926 U CN 214773926U
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Abstract
The utility model belongs to the technical field of the temperature control technique and specifically relates to a extruding machine temperature control circuit, including three-phase five-wire system power, temperature controller, heat-generating body and cooling blower, still include the converter. The utility model provides a extruding machine temperature control circuit can utilize reasonable circuit design for temperature control to the extruding machine is more accurate, promotes product extrusion molding effect.
Description
Technical Field
The utility model belongs to the technical field of the temperature control technique and specifically relates to a extruding machine temperature control circuit.
Background
At present, in the temperature control technology of the plastic extruding machine, a thermocouple of a temperature controller is generally adopted to detect the ambient temperature, when the detected temperature is smaller than the heating hysteresis quantity of a set value, a heating contact of the temperature controller is connected, a coil loop of an alternating current contactor is closed, a coil of the alternating current contactor is electrified, a main contact of the alternating current contactor is closed, a heating element is connected to start heating, when the ambient temperature reaches the set value, the heating contact of the temperature controller is disconnected, the coil loop of the alternating current contactor is disconnected, the coil is electrified, the main contact is disconnected, and the heating element stops heating.
When the thermocouple of the temperature controller detects that the ambient temperature is larger than the cooling hysteresis quantity of a set value, the cooling contact of the temperature controller is connected, the coil loop of the alternating current contactor is closed, the coil of the alternating current contactor is electrified, the main contact of the alternating current contactor is closed, the cooling fan is connected to start cooling, when the ambient temperature reaches the set value, the cooling contact of the temperature controller is disconnected, the coil loop of the alternating current contactor is disconnected, the coil is electrified, the main contact is disconnected, and the cooling fan stops cooling. The temperature fluctuates around the set value and is controlled within a reasonable interval.
The temperature can be controlled to fluctuate in an interval, and the temperature control precision is relatively poor.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned technique not enough and provide an extruding machine temperature control circuit, can effectively promote temperature control's precision.
The utility model discloses a temperature control circuit of a plastic extruding machine, which comprises a three-phase five-wire system power supply, a temperature controller, heating elements and a cooling fan, wherein an air switch is arranged on the three-phase five-wire system power supply, a power contact of the temperature controller is connected with a phase line and a working zero line of the three-phase five-wire system power supply, a heating contact of the temperature controller is connected with the phase line and the working zero line of the three-phase five-wire system power supply, a coil of a first alternating current contactor is arranged between the heating contact and the working zero line, a main contact of a first alternating current contactor and a coil of a second alternating current contactor are connected in series between the phase line and the working zero line of the three-phase five-wire system power supply, one or a plurality of heating elements are connected in parallel on the phase line of the three-phase five-wire system power supply, a main contact of a second alternating current contactor is connected in series between the heating elements and the phase line, the temperature control circuit also comprises a frequency converter, the cooling contact of the temperature controller is connected to an analog signal input end and an analog grounding end of the frequency converter, the power input end of the frequency converter is respectively connected with the phase line of the three-phase five-wire system power supply, the power output end of the frequency converter is connected to the cooling fan, and the protection zero line end of the frequency converter is connected to the protection zero line end of the cooling fan.
In the above technical scheme, the temperature controller adopts a PID control mode, the program can perform PID operation through the detected temperature and the set temperature, and then the operation result is output for temperature control, and the parameter values are automatically generated through self-setting. When the detection temperature is less than the set temperature, the heating contact of the temperature controller is closed, so that the coil of the first alternating current contactor is electrified, the main contact of the first alternating current contactor is closed, then the coil of the second alternating current contactor is electrified, and the main contact of the second alternating current contactor is connected, so that the heating body is electrified and heated. When the temperature reaches a set value, the heating contact of the temperature controller is disconnected, so that the coil of the first alternating current contactor is powered off, the main contact of the first alternating current contactor is disconnected, the coil of the second alternating current contactor is powered off, the main contact of the second alternating current contactor is disconnected, and the heating body stops heating. The cooling circuit adopts a frequency converter to control a cooling fan, and the frequency is directly given by a temperature controller. Due to the existence of friction heating in the screw cylinder of the extruding machine, overtemperature is often caused, and after variable-frequency cooling is adopted, the cooling effect is more linear and the control precision is better.
The utility model provides a extruding machine temperature control circuit can utilize reasonable circuit design for temperature control to the extruding machine is more accurate, promotes product extrusion molding effect.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Example 1:
as shown in fig. 1, the utility model discloses a temperature control circuit of plastic extruding machine, including three-phase five-wire system power supply including phase line L1/L2/L3 and work zero line N, protection zero line PE, temperature controller U4, heat-generating body E1 and cooling blower M2, be provided with air switch F1 on the three-phase five-wire system power supply, phase line L1 and work zero line N of three-phase five-wire system power supply are connected to the power contact L/N of temperature controller U4, and phase line L1 and work zero line N of three-phase five-wire system power supply are connected to heating contact 5/6 of temperature controller U4, and set up the coil of first AC contactor K1 between heating contact 6 and work zero line N, and establish ties the main contact of first AC contactor K1 and the coil of second AC contactor KM1 between the phase line L1 and work zero line N of three-phase five-wire system power supply, and have one or more heat-generating bodies E1 in parallel connection on the phase line L1 of three-phase line five-wire system power supply, a main contact of a second alternating current contactor KM1 is connected in series between the heating element E1 and the phase line L1, the electric heating device further comprises a frequency converter U3, a cooling contact 3/4 of the temperature controller U4 is connected to an analog signal input end AI1 and an analog grounding end GND of the frequency converter U3, a power input end R/S/T of the frequency converter U3 is respectively connected with the phase line L1/L2/L3 of the three-phase five-wire system power supply, power output ends U/V/W of the frequency converter U3 are connected to the cooling fan M2, and a protection neutral wire end PE of the frequency converter U3 is connected to a protection neutral wire end PE of the cooling fan M2.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention.
Claims (1)
1. A temperature control circuit of a plastic extruding machine is characterized in that: the three-phase five-wire system power supply is provided with an air switch, a power contact of the temperature controller is connected with a phase line and a working zero line of the three-phase five-wire system power supply, a heating contact of the temperature controller is connected with the phase line and the working zero line of the three-phase five-wire system power supply, a coil of a first alternating current contactor is arranged between the heating contact and the working zero line, a main contact of the first alternating current contactor and a coil of a second alternating current contactor are connected in series between the phase line and the working zero line of the three-phase five-wire system power supply, one or more heating elements are connected in parallel on the phase line of the three-phase five-wire system power supply, a main contact of the second alternating current contactor is connected in series between the heating elements and the phase line, the three-phase five-wire system power supply further comprises a frequency converter, the cooling contact of the temperature controller is connected to an analog signal input end and an analog grounding end of the frequency converter, and the power input end of the frequency converter is respectively connected with the phase line of the three-phase five-wire system power supply, the power output ends of the frequency converters are connected to the cooling fan, and the protection zero line end of the frequency converter is connected to the protection zero line end of the cooling fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478655.1U CN214773926U (en) | 2021-06-29 | 2021-06-29 | Temperature control circuit of plastic extruding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121478655.1U CN214773926U (en) | 2021-06-29 | 2021-06-29 | Temperature control circuit of plastic extruding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214773926U true CN214773926U (en) | 2021-11-19 |
Family
ID=78715154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121478655.1U Active CN214773926U (en) | 2021-06-29 | 2021-06-29 | Temperature control circuit of plastic extruding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214773926U (en) |
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2021
- 2021-06-29 CN CN202121478655.1U patent/CN214773926U/en active Active
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