CN216001347U - Heating system and injection molding machine - Google Patents
Heating system and injection molding machine Download PDFInfo
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- CN216001347U CN216001347U CN202120011593.7U CN202120011593U CN216001347U CN 216001347 U CN216001347 U CN 216001347U CN 202120011593 U CN202120011593 U CN 202120011593U CN 216001347 U CN216001347 U CN 216001347U
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Abstract
The embodiment of the utility model relates to the technical field of injection molding machines, and discloses a heating system capable of being applied to an injection molding machine, which comprises a heating control circuit, a power distribution module, a temperature control module and a heating coil, wherein, the power distribution module uses the function that the frequency converter can convert alternating current commercial power into direct current for output, the output end of the power distribution module is connected with the input end of the heating control circuit, the output end of the temperature control module is also connected with the input end of the heating control circuit, the heating control circuit is used for controlling the heating temperature of the heating coil according to the control signal of the temperature control module, the output end of the heating control circuit is connected with the heating coil, meanwhile, the heating coil is used as a braking unit of the frequency converter in the embodiment of the utility model, the heating coil can directly take power from the frequency converter in a direct current way, thereby greatly increasing the overall power utilization efficiency of the injection molding machine, reducing the system loss and lowering the equipment cost.
Description
Technical Field
The embodiment of the utility model relates to the technical field of injection molding machines, in particular to a heating system and an injection molding machine.
Background
An injection molding machine is also known as an injection molding machine or an injection machine. It is a main forming equipment for making various shaped plastic products from thermoplastic plastics or thermosetting plastics by using plastic forming mould. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity. Wherein, injection molding machine heating system mainly comprises temperature controller, heating control circuit and heating coil. The heating control circuit receives a control signal from the temperature controller, controls external incoming alternating current to be applied to the heating coil to control heating temperature, and mainly comprises IO (input/output), a switching device, a protection device and the like.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art:
1. the contactor and the circuit breaker are used as traditional heating control protection devices, response time is long, generally at least 20ms, the circuit breaker is not disconnected frequently, a solid relay or a contactor used as a switching device is burnt out, and problems such as bonding can occur. And in the injection molding machine operating mode, the probability that heating coil appears the short circuit is great, and especially the heating coil of penetrating the mouth often overflows and leads to heating coil short circuit or transship, causes the staff and needs frequently to change the coil, contactor or solid state relay even, influences production downtime extension, reduces production efficiency.
2. The injection molding machine is a large power consumer, the power consumption is mainly achieved by an injection molding power part and a plastic heating part, and the power consumption proportion is 3: 1 to 4: 1, in recent years, servo improvement is promoted to reduce the power consumption of a power part, the energy consumption of a heating part cannot be reduced, and the braking energy consumption of a servo motor of the power part is consumed on a resistor.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, an object of the embodiments of the present invention is to provide a heating system and an injection molding machine, which can improve the overall efficiency of the injection molding machine.
The purpose of the embodiment of the utility model is realized by the following technical scheme:
to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a heating system, including:
a power distribution module comprising: the frequency converter is used for controlling the motor and converting alternating current commercial power into direct current;
the input end of the heating control circuit is connected with the output ends of the power distribution module and the temperature control module, and the output end of the heating control circuit is connected with the control end of the heating coil and used for controlling the heating temperature of the heating coil according to a control signal;
the temperature control module is used for outputting a temperature control signal;
the heating coil is used as a final control object of the heating system, and the input end of the heating coil is connected with the output end of the heating control circuit.
In some embodiments, the frequency converter in the power distribution module is provided with a direct current positive output end, a direct current negative output end and a three-phase line inlet end, and the three-phase line inlet end is respectively connected with an R-phase, an S-phase and a T-phase three-phase live wire of a power grid;
the power distribution module further comprises a zero line;
the heating control circuit includes:
a first voltage division switch circuit, the power input end of which is connected with the direct current positive output end of the frequency converter and the zero line,
and the power supply input end of the second voltage division switch circuit is connected with the zero line and the direct current negative electrode output end of the frequency converter.
In some embodiments, the heating control side circuit further comprises an overcurrent protection circuit, an input end of which is connected to the output ends of the first voltage division switch circuit and the second voltage division switch circuit, and an output end of which is connected to the input ends of the temperature control module and the driving circuit.
In some embodiments, the heating control circuit further includes a driving circuit, an input end of the driving circuit is connected to an output end of the temperature control module, and an output end of the driving circuit is connected to control ends of the first voltage-dividing switch circuit and the second voltage-dividing switch circuit, so as to control the first voltage-dividing circuit and the second voltage-dividing circuit to be turned on or off after the control signal is converted into the driving signal.
In some embodiments, the first voltage-dividing switching circuit and the second voltage-dividing switching circuit each include three sets of sub-switching circuits having the same structure, wherein,
the sub-switching circuit of the first voltage-dividing switching circuit includes:
a first switch tube, the gate pole of which is connected with the output end of the drive circuit, the collector of which is connected with the input end of the heating coil, and the emitter of which is connected with the zero line,
the negative electrode of the first freewheeling diode is connected with the direct current positive electrode output end of the frequency converter, and the positive electrode of the first freewheeling diode is connected with the collector electrode of the first switching tube;
the sub-switching circuit of the second voltage-dividing switching circuit includes:
a gate pole of the second switching tube is connected with the output end of the driving circuit, a collector electrode of the second switching tube is connected with the input end of the heating coil, an emitter electrode of the second switching tube is connected with the direct current negative electrode output end of the frequency converter,
and the cathode of the second freewheeling diode is connected with the zero line, and the anode of the second freewheeling diode is connected with the collector of the second switching tube.
In some embodiments, the first switch tube and the second switch tube are insulated gate bipolar transistors.
In some embodiments, the first and second freewheeling diodes are fast recovery diodes or schottky diodes.
In some embodiments, the heating coils have a total of six groups,
the overcurrent protection circuit comprises six groups of sub-protection circuits with the same structure, the input end of each sub-protection circuit is respectively connected with the output end of the sub-switch circuit, and the output end of each sub-protection circuit is respectively connected with the drive circuit of each group of heating control circuits and the temperature control module.
The sub-protection circuit includes:
and the input end of the current sensor or the current detection chip is connected with the output end of the sub-switch circuit, and the output end of the current sensor or the current detection chip is connected with the drive circuit of the heating control circuit and the temperature control module.
In some embodiments, the driving circuit includes six sets of sub-driving circuits with the same structure, an input end of each sub-driving circuit is connected to an output end of the temperature control module, an output end of each sub-driving circuit is connected to a control end of each sub-switching circuit,
the sub-driving circuit includes:
the input end of the optical coupler is connected with the output end of the temperature control module;
and the voltage stabilizing tube is connected with the output end of the optocoupler, and the output end of the voltage stabilizing tube is connected with the control end of the sub-switch circuit.
In some embodiments, the heating system further comprises:
the circuit breaker circuit comprises six groups of double-channel circuit breakers, the input ends of the circuit breakers are respectively connected with the output ends of the sub-switch circuits, and the output ends of the circuit breakers are respectively connected with the heating coils.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides an injection molding machine, including the heating system according to the first aspect.
Compared with the prior art, the utility model has the beneficial effects that: in contrast to the state of the art, embodiments of the present invention provide a heating system that can be applied in an injection molding machine, the system including a power distribution module, a heating coil, a temperature control module, and a heating control circuit, wherein, the power distribution module uses the function that the frequency converter can convert alternating current commercial power into direct current for output, the output end of the power distribution module is connected with the input end of the heating control circuit, the output end of the temperature control module is also connected with the input end of the heating control circuit, the heating control circuit is used for controlling the heating temperature of the heating coil according to the control signal of the temperature control module, the output end of the heating control circuit is connected with the heating coil, meanwhile, the heating coil is used as a braking unit of the frequency converter in the embodiment of the utility model, the heating coil can directly take power from the frequency converter in a direct current way, thereby greatly increasing the overall power utilization efficiency of the injection molding machine, reducing the system loss and lowering the equipment cost.
Drawings
The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/blocks having the same reference number designation may be represented by like elements/blocks, and in which the drawings are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of an application environment of a heating system provided by an embodiment of the utility model;
FIG. 2 is a block diagram of a heating system according to an embodiment of the present invention;
FIG. 3 is a block diagram of another heating system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first voltage-dividing switch circuit and a second voltage-dividing switch circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a sub-protection circuit of an overcurrent protection circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sub-driving circuit of a driving circuit according to an embodiment 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 utility model, but are not intended to limit the utility model 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 utility model. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
At present, a heating coil in a heating system of an injection molding machine generally needs to obtain electricity from alternating current mains supply through a rectifier, a servo motor added in servo transformation of the injection molding machine needs to be connected with a brake resistor when braking, and in order to solve the problems that a heating coil electricity-obtaining circuit in the existing injection molding machine is complex and brake energy consumption is wasted on the brake resistor, the embodiment of the utility model provides the heating system capable of being applied to the injection molding machine.
Fig. 1 is a schematic diagram of an application environment of a heating system according to an embodiment of the present invention, where the application environment includes: the injection molding machine 10, the injection molding machine 10 comprising a heating system 100 according to an embodiment of the present invention, the heating system 100 may be a heating system 100 according to an embodiment of the present invention. The heating system 100 can apply the braking energy generated in the servo system to the heating coil through the frequency converter, so that the energy utilization rate is improved, the heating of the system is reduced, energy is saved, the environment is protected, and meanwhile, the system is also provided with a temperature control module and a heating control circuit for controlling the heating temperature of the heating coil so as to ensure that the heating system 100 can normally and safely operate.
Further, in the heating system 100, a solid-state relay or a contactor is mainly used as a switching device, and protection is mainly performed by a circuit breaker, once a coil is short-circuited or otherwise failed, a load is disconnected by overload of the circuit breaker, and an operator judges a fault loop according to a state of the circuit breaker to perform maintenance work such as coil replacement. The protection device has longer response time and is easy to cause the switch device to be burnt out, so further, the embodiment of the utility model can improve the circuit design of the switch device and the protection device and the adopted devices to solve the problems.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides a heating system, please refer to fig. 2 together, which shows a structural block diagram of a heating system, the heating system 100 may be applied in the injection molding machine 10, and the heating system 100 includes: a power distribution module 110, a heating coil 120, a temperature control module 130, and a heating control circuit 140. Wherein the content of the first and second substances,
the power distribution module 110 includes: the frequency converter 111 is used for controlling a motor and converting alternating current commercial power into direct current, the input end of the frequency converter 111 is used for inputting the alternating current commercial power, and the output end of the frequency converter 111 is used for outputting the direct current; the power distribution module 110 may be a module that supplies power to each system in the injection molding machine 10 described above, and specifically, may be a module that supplies power to at least the heating coil 120 and a servo system in the injection molding machine 10.
The heating coil 120 is the final control object of the heating system, and the input end of the heating coil is connected with the output end of the heating control circuit 140; the heating coil 120 is used for providing heat energy to the injection molding machine 10 to heat and melt the plastic, and the heating coil 120 is preferably a coil with high heat conversion efficiency.
The temperature control module 130 is configured to output a temperature control signal; the temperature control module 130 is a module provided with a chip and capable of outputting a control signal for adjusting the heating temperature of the heating coil 120 according to the current heating condition of the injection molding machine 10 and the user's demand. Specifically, it may be controlled by a circuit design hardware, or the temperature control module 130 may also be a temperature controller, which may be controlled by software by inputting a software algorithm into a controller and a processor, or may also be a combination of the hardware control and the software control.
The input end of the heating control circuit 140 is connected to the output ends of the power distribution module 110 and the temperature control module 130, and the output end thereof is connected to the control end of the heating coil 120, so as to control the heating temperature of the heating coil 120 according to the control signal. The heating control circuit 140 is a hardware design module capable of directly controlling the heating temperature of the heating coil 120.
Further, the heating control circuit 140 may further have an overcurrent protection function, and the heating control circuit 140 may further include a driving circuit 144 and an overcurrent protection circuit 143, which are described below.
In the embodiment of the present invention, the heating coil 120 is used as a braking unit of the frequency converter 111, so that a braking resistor is omitted, the heating coil 120 can directly take electricity from the frequency converter 111 to convert electric energy into heat energy, and meanwhile, the actual heat output condition of the heating coil 120 can be controlled through the temperature control module 130 and the heating control circuit 140, specifically, the heating temperature of the heating coil 120 is controlled, and the heating system 100 provided by the embodiment of the present invention can greatly increase the overall power utilization efficiency of the injection molding machine, reduce the system loss, reduce the equipment cost, and is economical and environment-friendly.
In some embodiments, please refer to fig. 3, which illustrates a block diagram of another heating system according to an embodiment of the present invention, as shown in fig. 3, the frequency converter 111 included in the power distribution module 110 is provided with a DC positive output terminal DC +, a DC negative output terminal DC-, and a three-phase incoming terminal, where the three-phase incoming terminal is respectively connected to an R-phase, an S-phase, and a T-phase live line of a power grid; the power distribution module 110 further comprises a neutral line N;
the heating control circuit 140 includes: a first voltage-dividing switching circuit 141, a power input end of which is connected to the DC positive output end DC + of the frequency converter 111 and the neutral line N; and a power input end of the second voltage division switching circuit 142 is DC-connected with the neutral line N and the DC negative output end of the frequency converter 111.
In the embodiment of the present invention, since the input end of the frequency converter 111 receives 380V ac commercial power, which can only rectify the 380V ac commercial power to output 380V DC power, however, the heating coils commonly used in the injection molding machine 10 on the market are basically of 220V input type, and the output voltage of the frequency converter 111 exceeds the withstand voltage of the heating coils at present, in the embodiment of the present invention, a zero line N is introduced into the power distribution module 110, a point of the zero line N is located at a middle point of the DC positive output end DC + and the DC negative output end DC-, so that the DC bus voltage output by the frequency converter 111 is divided into two segments of substantially equal voltages by the DC positive output end DC + of the frequency converter 111, the DC negative output end DC-of the frequency converter 111, and the zero line N, are respectively applied to the first voltage-dividing switching circuit 141 and the second voltage-dividing switching circuit 142, thereby providing appropriate voltages to the heating coils 120 respectively connected to the output terminals of the first voltage-dividing switching circuit 141 and the second voltage-dividing switching circuit 142.
Specifically, referring to fig. 4, it shows a structure of a first voltage-dividing switch circuit and a second voltage-dividing switch circuit according to an embodiment of the present invention, as shown in fig. 4, each of the first voltage-dividing switch circuit 141 and the second voltage-dividing switch circuit 142 includes three sets of sub-switch circuits with the same structure, wherein,
the sub-switching circuit 141a of the first voltage-dividing switching circuit 141 includes: a first switching tube Q1, the gate of which is connected to the output terminal of the following drive circuit 144, the collector of which is connected to the input terminal of the heating coil 120, and the emitter of which is connected to the neutral line N; a negative electrode of the first freewheeling diode D7 is connected to the DC positive output terminal DC + of the inverter 111, and a positive electrode thereof is connected to the collector of the first switching transistor Q1.
The sub-switching circuit 142a of the second voltage-dividing switching circuit 142 includes: a second switching tube Q2, the gate of which is connected to the output terminal of the following driving circuit 144, the collector of which is connected to the input terminal of the heating coil 120, and the emitter of which is DC-connected to the DC negative output terminal of the inverter 111; a second freewheeling diode D10 having a negative electrode connected to the neutral line N and a positive electrode connected to the collector of the second switching transistor Q2; a second freewheeling diode D4 has a positive electrode connected to the emitter of the second switching transistor Q2 and a negative electrode connected to the collector of the second switching transistor Q2.
The first switch tube Q1 and the second switch tube Q2 are insulated gate bipolar transistors. In the embodiment of the present invention, the first switching tube Q1 and the second switching tube Q2 perform whether to supply power to the heating coil 120 according to the control signal issued by the temperature control module 130.
Wherein the first and second freewheel diodes D1 and D4 are fast recovery diodes or Schottky diodes. In the embodiment of the present invention, since the heating coil 120 has a certain inductance, a freewheeling diode needs to be added to ensure that no overvoltage occurs when the switching tube is turned off.
In a traditional heating system of an injection molding machine, a switching device of the heating system usually adopts a solid-state relay, a contactor or a thyristor, the solid-state relay, the contactor or the thyristor has the characteristic of zero crossing point turn-off, the response speed is slow, particularly, the contactor can be bonded, and the switching device can be burnt out before being turned off in time when a circuit is subjected to overcurrent and overvoltage under a common condition. In order to solve the problem that a switching device is easy to burn, damage and damage, in the embodiment of the utility model, six insulated gate bipolar transistors (IGBT tubes) are adopted as switching tubes to replace a traditional solid-state relay or a contactor or a thyristor to respectively control six heating coils, and the utility model has the characteristics of quick response and timely protection. However, since the Insulated Gate Bipolar Transistor (IGBT) is required to operate under a direct current voltage (voltage drop Vce between the emitter and the collector), the switching device in the embodiment of the present invention also utilizes the characteristic that the frequency converter 111 can output a direct current, so that the direct current output by the frequency converter 111 can supply power to the heating coil 120, and provide a high operating current voltage for the switching device.
It should be noted that, in the embodiment of the present invention, only the structures and the connection manners of the key devices in the sub-switch circuit 141a and the sub-switch circuit 142a, such as the switching tube and the freewheeling diode, are described, and for the arrangement, the connection manner and the type of the other devices in the sub-switch circuit 141a and the sub-switch circuit 142a, such as the resistor, the capacitor, etc., refer to fig. 4, but the present invention is not necessarily limited to the circuit shown in fig. 4, and the detailed description is not repeated here.
It should be noted that fig. 4 only provides specific circuit structures of the sub-switch circuit 141a and the sub-switch circuit 142a, and for the other sub-switch circuits in the first voltage-dividing switch circuit 141 and the other sub-switch circuits in the second voltage-dividing switch circuit 142, since the structures of the other sub-switch circuits in the first voltage-dividing switch circuit 141 are the same as the structures of the sub-switch circuit 141a, and the structures of the other sub-switch circuits in the second voltage-dividing switch circuit 142 are the same as the structures of the sub-switch circuit 142a, the difference is only that the interfaces of the front and rear circuit modules to which the control terminal, the input terminal and the output terminal are correspondingly connected are different (but the same), and therefore, detailed description thereof is omitted here.
In some embodiments, with continued reference to fig. 3, the heating control end circuit 140 further includes an overcurrent protection circuit 143, an input terminal of which is connected to the output terminals of the first voltage-dividing switch circuit 141 and the second voltage-dividing switch circuit 142, and an output terminal of which is connected to the input terminals of the temperature control module 130 and the driving circuit 144.
Specifically, the heating coils 120 have six groups, the over-current protection circuit 143 includes six groups of sub-protection circuits with the same structure, the input end of each sub-protection circuit is connected to the output end of the sub-switch circuit, the output end of each sub-protection circuit is connected to the driving circuit 144 of the heating control circuit 140 and the temperature control module 130,
referring to fig. 5, it shows a structure of a sub-protection circuit of an overcurrent protection circuit according to an embodiment of the present invention, as shown in fig. 5, the sub-protection circuit 143a includes: a current sensor or current detection chip U1, an input terminal of which is connected to an output terminal of the sub switch circuit, and an output terminal of which is connected to the driving circuit 144 of the heating control circuit 140 and the temperature control module 130; and the current limiting resistor R is connected to the control end of the current sensor or the current detection chip U1. The current sensor or the current detection chip U1 can immediately cut off a loop when the current exceeds a set value to realize reliable protection for the switching device, and specifically, the set value can be set by the configuration of the current limiting resistor R, and automatic output of a protection signal to turn off the switching device can be realized without involvement of a device having a calculation function, such as a processor.
In a traditional heating system of an injection molding machine, a breaker is generally adopted as a protection device for the protection device of the heating system, the response time is longer, generally at least 20ms, the response time is shorter when the current is larger, but the arc discharge time is longer, if the overcurrent multiple is not large, the response time is prolonged, the breaker is not opened, a solid-state relay or a contactor and the like serving as a switching device are burnt out, the contactor can be bonded particularly, and in addition, the whole processing technology and other heating parts can be damaged when overload or short circuit is not cut off timely. And in the injection molding machine operating mode, the probability that the short circuit appears in heating coil is great, especially penetrate the heating coil of mouth often and spill over and lead to heating coil short circuit or transship, other dust in addition, metal etc. also can lead to heating coil short circuit or transship, actual statistics, generally flat homogeneous is to two weeks, heating coil short circuit will take place once in less than two three days of producer even some, cause the staff to need frequently to change the coil, contactor or solid state relay even, influence production downtime extension, and the reduction production efficiency. In order to solve the problem of shutdown replacement and maintenance caused by burning out of a coil and a contactor due to untimely protection of a circuit breaker in the traditional injection molding machine, the embodiment of the utility model adopts the current sensor or the current detection chip U1 to perform overcurrent or short-circuit protection, so that the production efficiency can be improved, and the maintenance cost can be reduced.
It should be noted that, in the embodiment of the present invention, only the structures and the connection manners of the current sensor or the current detection chip U1 and the current limiting resistor R, which are key devices in the sub-protection circuit 143a, are described, and for the arrangement, the connection manner and the type of other devices, such as a resistor, a capacitor, etc., in the sub-protection circuit 143a, reference may be made to fig. 5, but the present invention is not necessarily limited to the circuit shown in fig. 5, and therefore, the detailed description thereof is omitted here.
It should be noted that fig. 5 only provides a specific circuit structure of one sub-protection circuit 143a, and the other sub-driving circuits in the over-current protection circuit 143 have the same structure as the sub-protection circuit 143a, and are different (but identical) only in the interfaces of the front and rear circuit modules to which the control terminal, the input terminal, and the output terminal are correspondingly connected, and therefore, the detailed description thereof is omitted here.
Furthermore, the heating circuit of the traditional injection molding machine is connected with a heating coil outside after passing through a contactor/solid-state relay, and the breaker plays a role in protection and maintenance, so that in the embodiment of the utility model, the purpose of maintaining the breaker in equipment can be kept. Once a certain coil is short-circuited, the complete machine of the injection molding machine is required to be maintained without power failure, and the circuit breaker can ensure that the heating coil 120 is safely replaced under the condition that the injection molding machine is not powered off.
In some embodiments, with continued reference to fig. 3, the heating control circuit 140 further includes a driving circuit 144, an input end of which is connected to the output end of the temperature control module 130, and an output end of which is connected to the control ends of the first voltage-dividing switch circuit 141 and the second voltage-dividing switch circuit 142, for controlling the first voltage-dividing circuit 141 and the second voltage-dividing circuit 142 to be turned on or off after converting the control signal into a driving signal.
Specifically, the driving circuit 144 includes six sets of sub-driving circuits with the same structure, the input end of each sub-driving circuit is connected to the output end of the temperature control module 130, the output end of each sub-driving circuit is connected to the control end of each sub-switching circuit,
referring to fig. 6, it shows a structure of a sub-driving circuit of a driving circuit according to an embodiment of the present invention, as shown in fig. 6, the sub-driving circuit 144a includes: an input end of the optical coupler U10 is connected with an output end of the temperature control module 130; and the voltage regulator tube ZD1 is connected with the output end of the optocoupler U10, and the output end of the voltage regulator tube ZD1 is connected with the control end of the sub-switch circuit.
Further, the heating system further comprises: the circuit breaker circuit comprises six groups of double-channel circuit breakers, the input ends of the circuit breakers are respectively connected with the output ends of the sub-switch circuits, and the output ends of the circuit breakers are respectively connected with the heating coils.
In the embodiment of the utility model, the driving of the switching tube adopts a general driving optocoupler to realize the large-current driving of the switching device, and the switching device can have the withstand voltage of 5000V.
It should be noted that, in the embodiment of the present invention, only the structures and connection manners of the optical coupler U10 and the voltage regulator ZD1, which are key devices in the sub-driver circuit 144a, are described, and for the arrangement, connection manner and types of other devices, such as resistors, capacitors, etc., in the sub-driver circuit 144a, reference may be made to fig. 6, but the present invention is not necessarily limited to the circuit shown in fig. 6, and therefore, details thereof are not described here.
It should be noted that fig. 6 only provides a specific circuit structure of one sub-driving circuit 144a, and the other sub-driving circuits in the driving circuit 144 have the same structure as the sub-driving circuit 144a, and only differ in that the interfaces of the front and rear circuit modules to which the input terminal and the output terminal are correspondingly connected are different (but identical), and therefore, detailed description thereof is omitted here.
The embodiment of the utility model provides a heating system capable of being applied to an injection molding machine, which comprises a power distribution module, a heating coil, a temperature control module and a heating control circuit, wherein the power distribution module has the function of converting alternating current commercial power into direct current for output by virtue of a frequency converter, the output end of the power distribution module is connected with the input end of the heating control circuit, the output end of the temperature control module is also connected with the input end of the heating control circuit, the heating control circuit is used for controlling the heating temperature of the heating coil according to a control signal of the temperature control module, and the output end of the heating control circuit is connected with the heating coil.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A heating system, comprising:
a power distribution module comprising: the frequency converter is used for controlling the motor and converting alternating current commercial power into direct current;
the input end of the heating control circuit is connected with the output ends of the power distribution module and the temperature control module, and the output end of the heating control circuit is connected with the control end of the heating coil and used for controlling the heating temperature of the heating coil according to a control signal;
the temperature control module is used for outputting a temperature control signal;
the heating coil is used as a final control object of the heating system, and the input end of the heating coil is connected with the output end of the heating control circuit.
2. The heating system of claim 1,
the frequency converter in the power distribution module is provided with a direct current positive output end, a direct current negative output end and a three-phase line inlet end, and the three-phase line inlet end is respectively connected with an R-phase, an S-phase and a T-phase three-phase live wire of a power grid;
the power distribution module further comprises a zero line;
the heating control circuit includes:
a first voltage division switch circuit, the power input end of which is connected with the direct current positive output end of the frequency converter and the zero line,
and the power supply input end of the second voltage division switch circuit is connected with the zero line and the direct current negative electrode output end of the frequency converter.
3. The heating system of claim 2,
the heating control circuit further comprises a driving circuit, an input end of the driving circuit is connected with an output end of the temperature control module, an output end of the driving circuit is connected with control ends of the first voltage division switch circuit and the second voltage division switch circuit, and the driving circuit is used for converting the control signal into a driving signal and then controlling the first voltage division circuit and the second voltage division circuit to be switched on or switched off;
the heating control circuit further comprises an overcurrent protection circuit, the input end of the overcurrent protection circuit is connected with the output ends of the first voltage division switch circuit and the second voltage division switch circuit, and the output end of the overcurrent protection circuit is connected with the input ends of the temperature control module and the driving circuit.
4. The heating system of claim 3,
the first voltage division switch circuit and the second voltage division switch circuit respectively comprise three groups of sub-switch circuits with the same structure, wherein,
the sub-switching circuit of the first voltage-dividing switching circuit includes:
a first switch tube, the gate pole of which is connected with the output end of the drive circuit, the collector of which is connected with the input end of the heating coil, and the emitter of which is connected with the zero line,
the negative electrode of the first freewheeling diode is connected with the direct current positive electrode output end of the frequency converter, and the positive electrode of the first freewheeling diode is connected with the collector electrode of the first switching tube;
the sub-switching circuit of the second voltage-dividing switching circuit includes:
a gate pole of the second switching tube is connected with the output end of the driving circuit, a collector electrode of the second switching tube is connected with the input end of the heating coil, an emitter electrode of the second switching tube is connected with the direct current negative electrode output end of the frequency converter,
and the cathode of the second freewheeling diode is connected with the zero line, and the anode of the second freewheeling diode is connected with the collector of the second switching tube.
5. The heating system of claim 4,
the first switch tube and the second switch tube are insulated gate bipolar transistors.
6. The heating system of claim 5,
the first and second freewheeling diodes are fast recovery diodes or schottky diodes.
7. The heating system according to any one of claims 4 to 6,
the heating coils are divided into six groups in total,
the overcurrent protection circuit comprises six groups of sub-protection circuits with the same structure, the input end of each sub-protection circuit is respectively connected with the output end of the sub-switch circuit, and the output end of each sub-protection circuit is respectively connected with the drive circuit of each group of heating control circuits and the temperature control module;
the sub-protection circuit includes:
and the input end of the current sensor or the current detection chip is connected with the output end of the sub-switch circuit, and the output end of the current sensor or the current detection chip is connected with the drive circuit of the heating control circuit and the temperature control module.
8. The heating system of claim 7,
the driving circuit comprises six groups of sub-driving circuits with the same structure, the input end of each sub-driving circuit is respectively connected with the output end of the temperature control module, the output end of each sub-driving circuit is respectively connected with the control end of each sub-switching circuit,
the sub-driving circuit includes:
the input end of the optical coupler is connected with the output end of the temperature control module;
and the voltage stabilizing tube is connected with the output end of the optocoupler, and the output end of the voltage stabilizing tube is connected with the control end of the sub-switch circuit.
9. The heating system of claim 8, further comprising:
the circuit breaker circuit comprises six groups of double-channel circuit breakers, the input ends of the circuit breakers are respectively connected with the output ends of the sub-switch circuits, and the output ends of the circuit breakers are respectively connected with the heating coils.
10. An injection molding machine comprising a heating system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120011593.7U CN216001347U (en) | 2021-01-04 | 2021-01-04 | Heating system and injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120011593.7U CN216001347U (en) | 2021-01-04 | 2021-01-04 | Heating system and injection molding machine |
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| Publication Number | Publication Date |
|---|---|
| CN216001347U true CN216001347U (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120011593.7U Active CN216001347U (en) | 2021-01-04 | 2021-01-04 | Heating system and injection molding machine |
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| Country | Link |
|---|---|
| CN (1) | CN216001347U (en) |
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- 2021-01-04 CN CN202120011593.7U patent/CN216001347U/en active Active
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