CN210525831U - Air cooling system and FDM extrusion device thereof - Google Patents
Air cooling system and FDM extrusion device thereof Download PDFInfo
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- CN210525831U CN210525831U CN201920696581.5U CN201920696581U CN210525831U CN 210525831 U CN210525831 U CN 210525831U CN 201920696581 U CN201920696581 U CN 201920696581U CN 210525831 U CN210525831 U CN 210525831U
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Abstract
The utility model discloses an air cooling system and FDM extrusion device, the air cooling system comprises a suction fan and a thermal control valve, the thermal control valve comprises a valve shell, an adjusting cavity and a blowing cavity are respectively arranged in the valve shell, and the blowing cavity is provided with a through blowing hole; the adjusting cavity and the air blowing cavity are communicated through a connecting air pipe, an adjusting piston and an adjusting spring are arranged in the adjusting cavity, the adjusting cavity is divided into two parts by the adjusting piston, the part communicated with the connecting air pipe is also communicated with one end of an air guide pipe, and the other end of the air guide pipe is communicated with an exhaust pipe; the adjusting spring is arranged in the adjusting cavity and the part which is not communicated with the connecting air pipe, one end of the adjusting spring is fixedly assembled with the adjusting piston, and the other end of the adjusting spring is sleeved outside the guide pipe. The utility model discloses an air cooling system, it adopts the thermal control valve control amount of wind to make the thermal control valve of installing on each equipment can adjust the amount of wind in order to increase the radiating effect according to the heat of each equipment. When the temperature is too high, the micro switch can be adjusted to input information to the controller so as to warn an operator.
Description
Technical Field
The utility model relates to a FDM rapid prototyping technique especially relates to an air cooling system and FDM extrusion device thereof.
Background
FDM rapid prototyping technique is as a novel rapid prototyping technique that the middle and later stages of the 80 th century developed, mainly adopts the plastics wire rod to carry out rapid prototyping as the consumptive material, has advantages such as system architecture cost is lower, and equipment is small, and work is pollution-free, is an ideal rapid prototyping system that can use in the office environment, but at present there is the shaping speed slowly, and the consumptive material kind is few shortcoming.
In order to better apply the new forming technique to overcome the existing disadvantages, the utility model proposes a way of using thermoplastic particles directly as FDM extrusion device by connecting a screw extruder in series with a melt pump. However, due to the pressure and flow fluctuations that occur in screw extruder delivery, these fluctuations can lead to a decrease in melt pump extrusion stability.
The invention provides an FDM extrusion device based on a single-screw melt pump, which is applied on the same day as the scheme and is named as an FDM extrusion device based on a single-screw melt pump, and the technical scheme for solving the problems is provided, and the aim of the scheme is to provide the air cooling system applied in the patent application so as to solve the heat dissipation problem of each electrical device.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defect of prior art, the utility model aims to solve the technical problem that an air cooling system and FDM extrusion device are provided, its air cooling system can be according to each heat control amount of wind that needs radiator equipment.
In order to achieve the purpose, the utility model provides an air cooling system, which comprises a suction fan and a thermal control valve, wherein the thermal control valve comprises a valve shell, an adjusting cavity and an air blowing cavity are respectively arranged in the valve shell, and the air blowing cavity is provided with an air blowing hole which penetrates through the air blowing cavity;
the adjusting cavity and the air blowing cavity are communicated through a connecting air pipe, an adjusting piston and an adjusting spring are arranged in the adjusting cavity, the adjusting cavity is divided into two parts by the adjusting piston, the part communicated with the connecting air pipe is also communicated with one end of an air guide pipe, and the other end of the air guide pipe is communicated with an exhaust pipe;
the adjusting spring is arranged in the adjusting cavity and the part which is not communicated with the connecting air pipe, one end of the adjusting spring is fixedly assembled with the adjusting piston, and the other end of the adjusting spring is sleeved outside the guide pipe.
As a further improvement of the utility model, the guide pipe is internally provided with a hollow guide cavity, the guide cavity is assembled with one end of the trigger rod in a sliding way, the other end of the trigger rod is fixed on the adjusting piston, an adjusting micro switch is arranged in the guide cavity, and the output end of the adjusting micro switch is in communication connection with the signal end of the controller through a signal wire;
in an initial state, the adjusting piston partially shields the communicating part of the air duct and the adjusting cavity; the adjusting spring is a memory spring.
As a further improvement of the utility model, the adjusting spring retracts at the temperature of 60-80 ℃.
As a further improvement of the utility model, in the initial state, the adjusting piston shields the air duct from 2/3 on the section of the communicating part of the adjusting cavity.
As a further improvement, the air inlet of the suction fan is communicated with the feed valve through an air inlet pipe, and the air inlet pipe is communicated with the air outlet of the air compensating valve.
An FDM extrusion device is applied to the air cooling system.
As a further improvement of the present invention, the present invention further comprises:
the controller is used for controlling the frequency of the electric energy output by the frequency converter;
the frequency converter is used for outputting electric energy with different frequencies according to signals of the controller;
the screw extruder is used for heating the plastic particles, melting the plastic particles and then extruding the plastic particles;
the melt pressure sensor is used for detecting the pressure of the melt in the feeding pipe;
the melt pump is used for extruding the melt melted by the screw extruder;
the feed inlet of the screw extruder is communicated with the feed hopper, the discharge outlet of the screw extruder is communicated with the feed inlet of the melt pump through a feed pipe, and the discharge outlet of the melt pump is communicated with the discharge pipe;
the feeding pipe is provided with a melt pressure sensor, and the melt pressure sensor is used for detecting the pressure of the melt in the feeding pipe in real time;
the signal output end of the melt pressure sensor is in communication connection with the signal input end of the pressure transmitter, the signal output end of the pressure transmitter is in communication connection with the signal end of the controller, and the other signal end of the controller is also in communication connection with the signal input end of the frequency converter;
the power inlet end of the frequency converter is in conductive connection with an external power supply, and the power outlet end of the frequency converter is in conductive connection with the power inlet ends of the extrusion motor and the melt pump motor respectively.
As a further improvement of the utility model, the device also comprises a first shell, a second shell and a fixed plate, wherein the screw extruder, the melt pump, the extruder gearbox, the melt pump gearbox, the pressure transmitter, the extrusion motor and the melt pump motor are respectively fixed on the fixed plate, and the controller and the frequency converter are integrated on the control module;
a first belt wheel is mounted on the connecting shaft, the first belt wheel is connected with a second belt wheel through a belt to form a belt transmission mechanism, the second belt wheel is fixed on a pressing shaft, and a cam is sleeved and fixed on the part, positioned in the feeding hopper, of the pressing shaft which is arranged in the feeding hopper;
the cam comprises a large end and a small end, and when the cam rotates in the circumferential direction, the large end continuously extrudes the material to the screw extruder;
the feeding hopper is communicated with one end of the feeding pipe, the other end of the feeding pipe is communicated with an externally stored material, and the feeding hopper is also communicated with the material sucking pipe;
the other end of the material suction pipe is communicated with a gas suction cavity of a feed valve, and the feed valve is used for controlling whether to continue feeding according to the quantity of materials in the feed hopper;
the air suction cavity of the feed valve is internally provided with a feed piston in a sealing and sliding way, the feed piston divides the air suction cavity into two parts, one part is communicated with the air suction pipe, the other part is communicated with one end of the air inlet pipe, the other end of the air inlet pipe is communicated with an air inlet of a suction fan, and an air outlet of the suction fan is communicated with an exhaust pipe.
As a further improvement of the utility model, inhale one of material pipe position in the feeder hopper and serve and install the filter screen, the filter screen is used for preventing that the material from getting into inhales in the material pipe and still need to guarantee to inhale the intercommunication of material pipe and feeder hopper.
As a further improvement of the utility model, the feeding piston is provided with an air vent and a sealing groove, the air vent penetrates through the feeding piston and is communicated with the sealing groove, the sealing groove is hinged with one end of the sealing plate through a pin shaft, a torsional spring is arranged between the sealing plate and the inner wall of the sealing groove, and the torsional spring is used for generating a force which enables the sealing plate to be opened in an inclined included angle with the axial direction of the air vent;
the end face of the end, close to the air inlet pipe, of the feeding piston is fixedly provided with a triggering protrusion, the end face is tightly attached to or welded and fixed with one end of a feeding spring, the feeding spring is sleeved outside the feeding limiting pipe, and a hollow feeding inner pipe is arranged inside the feeding limiting pipe.
The utility model has the advantages that:
the utility model discloses an air cooling system, it adopts the thermal control valve control amount of wind to make the thermal control valve of installing on each equipment can adjust the amount of wind in order to increase the radiating effect according to the heat of each equipment. Meanwhile, when the temperature is too high, the micro switch can be adjusted to input information to the controller so as to warn an operator.
The utility model discloses a FDM extrusion device has carried out miniaturization, lightweight design to FDM, and screw extruder is responsible for melting and carrying to the melt pump entry end to the thermoplasticity granule in entire system, and the melt pump is responsible for extruding thermoplasticity fuse-element ration is controllable. The mode can realize FDM molding of various materials (including plastics, MIN feeding and CIM feeding), and the molding speed exceeds 2 times of that of the traditional wire at present. Meanwhile, as the particle material is directly used, the FDM intermediate links are reduced, and the raw material cost is greatly reduced.
The utility model discloses FDM extrusion device adopts pressure transmitter to regulate and control, can keep melt pump entry end to have a stable suitable pressure value, can prevent that pressure from too big screw rod that arouses screw extruder from stalling and leaking, and the melt pump that can also prevent that the pressure oscillation from arousing simultaneously extrudes unstablely.
Drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is an enlarged view at F1 in fig. 2.
Fig. 4 is a schematic view of the cam structure of the present invention.
Fig. 5 is a schematic structural view of the thermal control valve of the present invention.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
referring to fig. 1-5, the FDM extrusion apparatus based on the single screw melt pump of the present embodiment includes:
a controller 271, configured to control the frequency of the electric energy output by the frequency converter, in this embodiment, a PID controller is adopted;
a frequency converter 272 for outputting electric energy of different frequencies according to a signal of the controller;
a screw extruder 230 for heating the plastic pellets and simultaneously melting and extruding the same;
a melt pressure sensor 240 for detecting the pressure of the melt in the feed pipe;
and a melt pump 250 for extruding the melt melted by the screw extruder so that the FDM molding can be realized.
The screw extruder 230 further comprises an extruding motor 211 and an extruder gearbox 221, wherein an output shaft of the extruding motor 211 is connected with an input shaft of the extruder gearbox 221, and an output shaft of the extruder gearbox 221 is connected with a driving shaft of the screw extruder 230 through a connecting shaft 310. Therefore, when the motor 211 runs, the power of the motor directly drives the screw in the screw extruder 230 to rotate after being regulated by the speed of the extruder gearbox 221. The speed reducing motor can be directly adopted to replace the extruding motor 211 and the extruding machine gearbox 221, and at the moment, the speed reducing motor directly drives the screw of the screw extruding machine 230 to rotate.
The melt pump 250 further comprises a melt pump motor 212 and a melt pump gearbox 222, wherein an output shaft of the melt pump motor 212 is assembled and driven with an input shaft of the melt pump gearbox 222, and an output shaft of the melt pump gearbox 222 is assembled and driven with a driving shaft of the melt pump 250. The melt pump gearbox 222 is used to regulate the rotational speed of the melt pump motor 212 to the melt pump 250, similar to existing automotive gearboxes. In this embodiment, the melt pump motor 212 and the melt pump gearbox 222 may be integrated into a speed reduction motor, and then the melt pump 250 is directly driven by the speed reduction motor, and the melt pump 250 may be a gear pump. When the melt pump is used, the power of the melt pump motor 212 is directly used for driving the gear pump to operate after being subjected to speed regulation through the melt pump gearbox 222.
The feed inlet of the screw extruder 230 is communicated with the feed hopper 360, the discharge outlet of the screw extruder 230 is communicated with the feed inlet of the melt pump 250 through the feed pipe 320, the discharge outlet of the melt pump 250 is communicated with the discharge pipe 330, and when the melt pump is used, melt extruded by the melt pump 250 is guided to a preset position through the discharge pipe 330.
The feeding pipe 320 is provided with a melt pressure sensor 240, and the melt pressure sensor 240 is used for detecting the pressure of the melt in the feeding pipe 320 in real time.
The signal output end of the melt pressure sensor 240 is in communication connection with the signal input end of a pressure transmitter 260, the signal output end of the pressure transmitter 260 is in communication connection with the signal end of a controller 271, and the other signal end of the controller 271 is also in communication connection with the signal input end of a frequency converter 272;
the power inlet end of the frequency converter 272 is in conductive connection with an external power supply, and the power outlet end is in conductive connection with the power inlet ends of the extrusion motor 211 and the melt pump motor 212 respectively; the melt pressure sensor, the pressure transmitter and the controller are used for regulating the voltage through a constant current source and supplying power after the voltage is changed into direct current.
When the melt pump is used, the extrusion pressure at the screw extruder 230 is changed, so that the melt pressure in the melt pump is also changed, namely the melt pressure input into the melt pump is unstable, and the melt pump is unstable in operation. In order to avoid this situation, in this embodiment, the melt pressure sensor 240 is adopted to transmit the signal in the feeding pipe to the pressure transmitter in real time, the pressure transmitter generates an electrical signal to transmit the electrical signal to the controller, the controller obtains a pressure signal value and then compares the pressure signal value with a preset pressure value, once a deviation is found, the controller sends a control instruction like a frequency converter, so that by adjusting the frequency (such as current frequency, power and the like) of the electrical energy transmitted to the extrusion motor and the melt pump motor, the states of the extrusion motor and the melt pump motor are adjusted after the input electrical energy of the extrusion motor and the melt pump motor is adjusted, the rotation speed, the output power and the like of the extrusion motor and the melt pump motor are adjusted, the pressure of the extrusion motor for extruding the melt and the rotation speed of the melt pump can be adjusted, and the adjustment of the extrusion motor is stopped until the pressure signal, thereby maintaining the pressure of the feeding pipe within the set interval value.
The design can well realize the stability of the extrusion pressure of the melt pump, thereby realizing the extrusion of a certain pressure interval on the melt to meet the requirement of FDM molding.
Referring to fig. 2-5, the apparatus further includes a first housing 110, a second housing 120, and a fixing plate 130, wherein the screw extruder 230, the melt pump 250, the extruder gearbox 221, the melt pump gearbox 222, the pressure transmitter 260, the extrusion motor 211, and the melt pump motor 212 are respectively fixed on the fixing plate 130, and the controller 271 and the frequency converter 272 are integrated on the control module 270. In this embodiment, there may be two frequency converters 272, which respectively control the power input of the extrusion motor 211 and the melt pump motor 212. And the signal ends of the two frequency converters are respectively in communication connection with the signal end of the controller.
The connecting shaft 310 is provided with a first belt wheel 411, the first belt wheel 411 is connected with a second belt wheel 412 through a belt 410 to form a belt transmission mechanism, the second belt wheel 412 is fixed on a pressing shaft 420, and the pressing shaft 420 is arranged in the feeding hopper 360, and a cam 430 is sleeved and fixed on the part of the pressing shaft 420, which is positioned in the feeding hopper 360. When the extrusion motor operates, the pressing shaft 420 and the screw extruder operate in synchronization.
The cam 430 comprises a large end 431 and a small end 432, and when the cam 430 rotates circumferentially, the large end 431 continuously extrudes the material to the screw extruder, so that the material can be stably input to the screw extruder;
the feeding hopper 360 is communicated with one end of the feeding pipe 350, the other end of the feeding pipe 350 is communicated with materials stored outside, the feeding hopper 360 is also communicated with the suction pipe 510, a filter screen 511 is arranged at one end of the suction pipe 510, which is positioned in the feeding hopper 360, the filter screen 511 is used for preventing the materials from entering the suction pipe 510 and ensuring the communication between the suction pipe 510 and the feeding hopper 360;
the other end of the material suction pipe 510 is communicated with a gas suction cavity 291 of the feed valve 290, and the feed valve 290 is used for judging whether to continue feeding according to the quantity of the materials in the feed hopper 360;
a feeding piston 520 is hermetically and slidably mounted in an air suction cavity 291 of the feeding valve 290, the air suction cavity 291 is divided into two parts by the feeding piston 520, one part of the two parts is communicated with the air suction pipe 510, the other part of the two parts is communicated with one end of an air inlet pipe 292, the other end of the air inlet pipe 292 is communicated with an air inlet of the suction fan 280, and an air outlet of the suction fan 280 is communicated with one end of the exhaust pipe 340;
the feeding piston 520 is provided with a vent hole 522 and a sealing groove 521, the vent hole 522 penetrates through the feeding piston 520 and is communicated with the sealing groove 521, the sealing groove 521 is hinged with one end of a sealing plate 530 through a pin 531, a torsion spring is installed between the sealing plate 530 and the inner wall of the sealing groove 521, the torsion spring is used for generating force for keeping the sealing plate 530 and the vent hole 522 open at a certain angle, and the angle can not be larger than 90 degrees and is generally 30-60 degrees. Because too large an angle may result in the vent hole 522 not generating sufficient suction to the sealing plate 530, such that the sealing plate 530 may not fit into the sealing slot 521 to seal the vent hole 522.
The feeding piston 520 is fixed with a trigger bulge 523 on the end face close to one end of the air inlet pipe 292, the end face is tightly attached to or welded and fixed with one end of a feeding spring 540, the feeding spring 540 is sleeved outside the feeding limiting pipe 560, a hollow feeding inner pipe 561 is arranged inside the feeding limiting pipe 560, a feeding micro switch 550 is installed in the feeding inner pipe 561, the output end of the feeding micro switch 550 is in communication connection with a signal end of a controller through a first wire 551, and when the feeding micro switch 550 is triggered, the controller obtains signal input.
When feeding is needed, the suction fan 280 is powered on to operate, negative pressure is generated inside the material suction pipe 510 and the feed hopper 360, at the moment, the material inlet pipe 350 also generates negative pressure, so that materials are sucked into the feed hopper from the material inlet pipe, the materials cannot enter the material suction pipe 510 due to the obstruction of the filter screen, but when the material suction pipe is submerged by the materials in the hopper, airflow at the filter screen can generate certain obstruction, namely the negative pressure in the material inlet pipe 350 is different from the negative pressure of the material suction pipe 510 (smaller than the negative pressure of the material suction pipe 510), so that the sealing plate 530 is sucked by the negative pressure of the vent hole 522, and the sealing plate overcomes the elasticity of the torsion spring to rotate towards the sealing groove until the sealing;
at this moment, the feeding piston 520 overcomes the elastic force of the feeding spring to move towards the feeding microswitch 550 under the suction action of the suction fan 280 until the triggering protrusion 523 triggers the feeding microswitch 550, and the controller obtains signal input at this moment so as to judge that the material in the feeding hopper is too much, and the controller controls the suction fan 280 to reduce power or directly close at this moment so as to avoid blockage in the feeding hopper. Of course, the air inlet pipe 292 may be communicated with an air outlet of the pressure compensating valve, an air inlet of the pressure compensating valve is communicated with the outside atmosphere, and when the air inlet pipe 292 generates a large negative pressure, the pressure compensating valve is opened, so that the negative pressure formed in the air inlet pipe 292 by the suction fan 280 is unloaded.
When the material in the feeder hopper reduces, inhale the negative pressure in the material pipe 510 and can balance in the feeder hopper gradually to make feeding piston 520 be close to inhale material pipe 510 one side atmospheric pressure and resume, closing plate 530 can use round pin axle 531 to rotate as the center under the torsional spring effect and open this moment, thereby again with air vent and inhale the material pipe intercommunication, at this moment, feeding spring can drive feeding piston 520 and reset, make feeding micro-gap switch 550 no longer triggered, also be exactly the feeding micro-gap switch no longer to controller transport signal. At this time, the controller controls the suction fan to recover the feeding state so as to feed. In this embodiment, a frequency converter may be connected in series to a wire connecting the suction fan and the external power source, and the frequency converter is controlled by the controller, so that the operation state of the suction fan may be controlled.
Preferably, because of the high heat production at the screw extruder, feed pipe, melt pump, and the like during use, the separation is necessary, otherwise the heat in the first and second housings is too high to affect the operation of other equipment.
The utility model discloses with first outer clamshell outside screw extruder, conveying pipe, melt pump, feeder hopper, at last fixed with the fixed plate assembly to realize thermal isolation.
In addition, the second housing 120 covers the extrusion motor, the control module, the pressure transmitter, and the melt pump motor, and is assembled and fixed with the fixing plate, thereby protecting the electrical device.
Preferably, when the heat dissipation device is used, the extrusion motor, the control module, the pressure transmitter, the melt pump motor and other devices can generate large heat, and if heat dissipation is not performed in time, heat concentration and temperature rise can be caused, so that the operation of each electrical device is seriously influenced. Therefore, heat dissipation is necessary.
In this embodiment, the thermal control valve 600 is fixed on the part of the extrusion motor, the control module, the pressure transmitter, and the melt pump motor that generates a larger amount of heat, such as the heat dissipation cover of the extrusion motor and the melt pump motor, and the heat dissipater or the heat dissipation fin of the control module and the pressure transmitter.
Referring to fig. 5, the thermal control valve 600 includes a valve housing 610, a regulating cavity 611 and an air blowing cavity 612 are respectively arranged in the valve housing 610, and an air blowing hole 613 penetrating through the air blowing cavity 612 is arranged on the air blowing cavity 612, so that when in use, air flow is blown out from the air blowing hole, thereby heat is taken away, that is, heat dissipation is realized;
the adjusting cavity 611 and the blowing cavity 612 are communicated through a connecting air pipe 620, an adjusting piston 630 and an adjusting spring 650 are installed in the adjusting cavity 611, the adjusting piston 630 divides the adjusting cavity 611 into two parts, wherein the part communicated with the connecting air pipe 620 is also communicated with one end of an air duct 640, and the other end of the air duct 640 is communicated with an exhaust pipe 340, so that air flow in the exhaust pipe is introduced into the air duct 640;
the adjusting spring 650 is installed in the adjusting cavity 611 and the portion which is not communicated with the connecting air pipe 620, one end of the adjusting spring is fixedly assembled with the adjusting piston 630, the other end of the adjusting spring is sleeved outside the guide pipe 670, a hollow guide cavity 671 is arranged inside the guide pipe 670, the guide cavity 671 is slidably assembled with one end of the trigger rod 660, the other end of the trigger rod 660 is fixed on the adjusting piston 630, an adjusting microswitch 680 is installed in the guide cavity 671, and the output end of the adjusting microswitch 680 is in communication connection with the signal end of the controller through a signal line 681. When the adjustment microswitch 680 is triggered, the controller determines that the thermal control valve 600 installed in the device may overheat, thereby alerting the operator to take care of the process in time.
The adjusting piston 630 shields the communicating part of the air duct 640 and the adjusting cavity 611 in the initial state, in this embodiment, the adjusting piston 630 shields 2/3 on the section of the communicating part of the air duct 640 and the adjusting cavity 611, so that only 1/3 part of the air duct 640 is communicated with the air blowing cavity 612;
and the adjustment spring 650 is a memory spring that retracts at a temperature between 60-80 c. When the temperature that valve casing 610 received is on the high side, can transmit temperature to adjusting spring 650, adjusting spring 650 can get the temperature after can retracting to the drive adjusting piston 630 removes to the guide tube, thereby increases the sectional area that air duct 640 and blowing chamber 612 communicate gradually, also the value increases the amount of wind that gets into blowing chamber 612, thereby realizes dispelling the heat fast.
If the temperature continues to rise, the adjustment spring 650 continues to retract until the adjustment microswitch 680 is triggered, at which point the controller receives a signal input and alerts the operator of overheating. On one hand, the design utilizes the airflow discharged by the suction fan to realize energy saving. On the other hand, the air volume entering the air blowing cavity 612 can be controlled through the adjusting spring 650, so that the air volume can be flexibly adjusted according to the heat productivity of each device to realize the optimization of air volume distribution. And finally, an overheat warning and an overheat signal output are also provided when the device is overheated, so that an operator is informed to timely process the device, and the device is prevented from being damaged.
The details of the present invention are well known to those skilled in the art.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The air cooling system is characterized by comprising a suction fan and a thermal control valve, wherein the thermal control valve comprises a valve shell, an adjusting cavity and an air blowing cavity are respectively arranged in the valve shell, and the air blowing cavity is provided with an air blowing hole which penetrates through the air blowing cavity;
the adjusting cavity and the air blowing cavity are communicated through a connecting air pipe, an adjusting piston and an adjusting spring are arranged in the adjusting cavity, the adjusting cavity is divided into two parts by the adjusting piston, the part communicated with the connecting air pipe is also communicated with one end of an air guide pipe, and the other end of the air guide pipe is communicated with an exhaust pipe;
the adjusting spring is arranged in the adjusting cavity and the part which is not communicated with the connecting air pipe, one end of the adjusting spring is fixedly assembled with the adjusting piston, and the other end of the adjusting spring is sleeved outside the guide pipe.
2. The air cooling system as claimed in claim 1, wherein the guide tube has a hollow guide cavity therein, the guide cavity is slidably assembled with one end of the trigger rod, the other end of the trigger rod is fixed on the adjusting piston, and the guide cavity is internally provided with an adjusting microswitch, and the output end of the adjusting microswitch is in communication connection with the signal end of the controller through a signal line;
in an initial state, the adjusting piston partially shields the communicating part of the air duct and the adjusting cavity; the adjusting spring is a memory spring.
3. The air cooling system of claim 2, wherein the spring is adjusted to retract at a temperature between 60-80 ℃.
4. The air-cooling system of claim 1, wherein in the initial state, the adjusting piston shields 2/3 of the section where the air duct is communicated with the adjusting cavity.
5. The air-cooling system of claim 1, wherein the air inlet of the suction fan is communicated with the feed valve through an air inlet pipe, and the air inlet pipe is further communicated with the air outlet of the air compensating valve.
6. An FDM extrusion having the air cooling system of any one of claims 1 to 5 applied thereto.
7. The FDM extrusion of claim 6 further comprising:
the controller is used for controlling the frequency of the electric energy output by the frequency converter;
the frequency converter is used for outputting electric energy with different frequencies according to signals of the controller;
the screw extruder is used for heating the plastic particles, melting the plastic particles and then extruding the plastic particles;
the melt pressure sensor is used for detecting the pressure of the melt in the feeding pipe;
the melt pump is used for extruding the melt melted by the screw extruder;
the feed inlet of the screw extruder is communicated with the feed hopper, the discharge outlet of the screw extruder is communicated with the feed inlet of the melt pump through a feed pipe, and the discharge outlet of the melt pump is communicated with the discharge pipe;
the feeding pipe is provided with a melt pressure sensor, and the melt pressure sensor is used for detecting the pressure of the melt in the feeding pipe in real time;
the signal output end of the melt pressure sensor is in communication connection with the signal input end of the pressure transmitter, the signal output end of the pressure transmitter is in communication connection with the signal end of the controller, and the other signal end of the controller is also in communication connection with the signal input end of the frequency converter;
the power inlet end of the frequency converter is in conductive connection with an external power supply, and the power outlet end of the frequency converter is in conductive connection with the power inlet ends of the extrusion motor and the melt pump motor respectively.
8. The FDM extrusion apparatus of claim 7 further comprising a first housing, a second housing, a fixed plate, the screw extruder, the melt pump, the extruder gearbox, the melt pump gearbox, the pressure transmitter, the extrusion motor, the melt pump motor are fixed on the fixed plate respectively, and the controller and the frequency converter are integrated on the control module;
a first belt wheel is mounted on the connecting shaft, the first belt wheel is connected with a second belt wheel through a belt to form a belt transmission mechanism, the second belt wheel is fixed on a pressing shaft, and the pressing shaft is mounted in the feeding hopper, and a cam is sleeved and fixed on the part of the pressing shaft, which is positioned in the feeding hopper;
the cam comprises a large end and a small end, and when the cam rotates in the circumferential direction, the large end continuously extrudes the material to the screw extruder;
the feeding hopper is communicated with one end of the feeding pipe, the other end of the feeding pipe is communicated with an externally stored material, and the feeding hopper is also communicated with the material sucking pipe;
the other end of the material suction pipe is communicated with a gas suction cavity of a feed valve, and the feed valve is used for controlling whether to continue feeding according to the quantity of materials in the feed hopper;
the air suction cavity of the feed valve is internally provided with a feed piston in a sealing and sliding way, the feed piston divides the air suction cavity into two parts, one part is communicated with the air suction pipe, the other part is communicated with one end of the air inlet pipe, the other end of the air inlet pipe is communicated with an air inlet of a suction fan, and an air outlet of the suction fan is communicated with an exhaust pipe.
9. The FDM extrusion of claim 8 wherein the end of the suction tube within the feed hopper has a screen mounted thereon to prevent material from entering the suction tube and to ensure communication between the suction tube and the feed hopper.
10. The FDM extrusion apparatus of claim 8, wherein the feed piston is provided with a vent hole and a sealing groove, the vent hole penetrates through the feed piston and is communicated with the sealing groove, the sealing groove is hinged to one end of the sealing plate through a pin, a torsion spring is installed between the sealing plate and the inner wall of the sealing groove, and the torsion spring is used for generating a force for keeping the sealing plate open at an inclined angle with the axial direction of the vent hole;
the end face of the end, close to the air inlet pipe, of the feeding piston is fixedly provided with a triggering protrusion, the end face is tightly attached to or welded and fixed with one end of a feeding spring, the feeding spring is sleeved outside the feeding limiting pipe, and a hollow feeding inner pipe is arranged inside the feeding limiting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920696581.5U CN210525831U (en) | 2019-05-15 | 2019-05-15 | Air cooling system and FDM extrusion device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920696581.5U CN210525831U (en) | 2019-05-15 | 2019-05-15 | Air cooling system and FDM extrusion device thereof |
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| CN210525831U true CN210525831U (en) | 2020-05-15 |
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| CN201920696581.5U Expired - Fee Related CN210525831U (en) | 2019-05-15 | 2019-05-15 | Air cooling system and FDM extrusion device thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683550A (en) * | 2022-04-01 | 2022-07-01 | 安徽中科祥晟科技有限公司 | Constant temperature cooling system for 3D printer |
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2019
- 2019-05-15 CN CN201920696581.5U patent/CN210525831U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683550A (en) * | 2022-04-01 | 2022-07-01 | 安徽中科祥晟科技有限公司 | Constant temperature cooling system for 3D printer |
| CN114683550B (en) * | 2022-04-01 | 2023-09-19 | 安徽中科祥晟科技有限公司 | Heat dissipation system for constant temperature 3D printer |
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