CN206367193U - A kind of fusion sediment type 3D printer of fast changeable printing head - Google Patents
A kind of fusion sediment type 3D printer of fast changeable printing head Download PDFInfo
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- CN206367193U CN206367193U CN201621381569.8U CN201621381569U CN206367193U CN 206367193 U CN206367193 U CN 206367193U CN 201621381569 U CN201621381569 U CN 201621381569U CN 206367193 U CN206367193 U CN 206367193U
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- printing head
- printer
- barrel
- fusion sediment
- supporting plate
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Abstract
The utility model discloses a kind of fusion sediment type 3D printer of fast changeable printing head, including stamp pad and printhead, described printhead includes：Supporting plate；Printing head, is made of metal material, is fixed on the supporting plate by printing head support；Heater, including electromagnetic induction coil, the electromagnetic induction coil are enclosed on outside printing head, are fixed on the supporting plate by coil brace；Cooling device, for cooling down printing head, is fixed on the supporting plate by cooling holder；Circuit is controlled, is electrically connected with described electromagnetic induction coil, alternating voltage is provided for electromagnetic induction coil.Fusion sediment type 3D printer heating arrangements of the present utility model and printing head organizational separation, are easy to the quick-replaceable of printing head.
Description
Technical field
The utility model is related to 3D printing technique field, more particularly to a kind of fusion sediment of fast changeable printing head
Type 3D printer.
Background technology
3D printing technique is also known as rapid shaping technique (Rapid Prototyping Manufacturing, abbreviation RP skills
Art), selective laser sintering (SLS), Stereolithography (SLA), laminated solid mass are divided into according to the difference of molding mode and are molded
And fused glass pellet (FDM) etc. (LOM).Fused glass pellet (FDM) rapid prototyping system and SLA, LOM, SLS system are most
Big difference is that FDM does not use laser system.
Fused glass pellet method (FDM, Fused Deposition Modeling) is the thermoplasticity using material, is passed through
By material such as thermoplastic heating melting, and fuse is extruded from the nozzle of heating, melt is carried out according to part desired trajectory
The forming method of deposition.
The 3D printer species for being currently based on fusion sediment method is extensive, wherein desktop level fusion sediment type 3D printer target
Colony is individual application, and precision is relatively low, relatively simple for structure.Mostly stepper motor is directly controlled by belt or leading screw
The displacement in tri- directions of XYZ.Shower nozzle part directly controls the input and output material and charging rate of material silk using stepper motor.At present
Most 3D printer shower nozzle is difficult to quick-replaceable, and filamentous form material is also limited to using material.
Publication No. CN105216327A Chinese patent literature discloses a kind of melting based on thermoplastic granulates material
Extrusion device, the melt extrusion apparatus includes Screw Extrusion mechanism, heating arrangements, feeding mechanism, reduction gearing mechanism and radiating
Mechanism.The Screw Extrusion mechanism includes the extrusion printhead of screw rod, machine barrel and machine barrel bottom；The heating arrangements include heating
Sleeve and temperature control instrument；The feeding mechanism is connected with the material guide port of machine barrel upper side；The reduction gearing mechanism includes watching
Take motor or stepper motor, planetary reducer, support and bearing etc. are installed；The cooling mechanism includes fin and fan；Together
When present invention also offers the 3D printing method based on the melt extrusion apparatus.But the manufacture of the shower nozzle of screw rod extrusion type is difficult,
It is difficult to disassembly, cleaning.
Air pressure extruded type shower nozzle is typically all to be made up of nozzle, heat block, radiating block, the part of heating rod four.Nozzle possesses
External screw thread, heat block possesses internal thread, and radiating block possesses internal thread.First heat block is screwed on nozzle, then radiating block is screwed to
On nozzle.Heating rod is inserted into the circular hole on heat block and heated.When air pressure extruded type shower nozzle is stopping extrusion, melt
Printed material can trickle downwards naturally under gravity, influence printing effect.
Publication No. CN105459397A Chinese patent literature discloses a kind of for fused glass pellet 3D printer
Drip-proof shower nozzle, including passage, heat block, nozzle and feed mechanism have feeding-passage on passage, nozzle, which is fixed on, leads
The lower end of expects pipe, the spout of nozzle is connected with the feeding-passage of passage；Passage is set in heat block, passage and heating
Block is fixedly connected；Shower nozzle has Anti-drip-leakage mechanism, and Anti-drip-leakage mechanism, which is included, can close the baffle plate of passage discharging opening, passage
Bottom is provided with guide groove, and baffle plate is arranged in guide groove, and baffle plate coordinates with guide groove gap；Baffle plate passes through transmission mechanism and stepper motor
Connection, transmission mechanism is converted into translation of the plate washer along passage radial direction by stepper motor, and transmission mechanism steppingly drives
Dynamic baffle plate closure or the discharging opening for opening passage.Although technology can prevent shower nozzle water clock disclosed in the patent, its structure
It is more complicated.
In addition, the mode of heating for being currently based on the 3D printer of fusion sediment method, which is generally resistance wire, directly heats shower nozzle, lead
Shower nozzle is caused to be difficult to quick-replaceable.
Utility model content
The utility model provide a kind of fast changeable printing head fusion sediment type 3D printer, heating arrangements with
Printing head organizational separation, is easy to the quick-replaceable of printing head.
A kind of fusion sediment type 3D printer of fast changeable printing head, including stamp pad and printhead, it is described
Printhead includes：
Supporting plate；
Printing head, is made of metal material, is fixed on the supporting plate by printing head support；
Heater, including electromagnetic induction coil, the electromagnetic induction coil are enclosed on outside printing head, solid by coil brace
Determine on the supporting plate；
Cooling device, for cooling down printing head, is fixed on the supporting plate by cooling holder；
Circuit is controlled, is electrically connected with described electromagnetic induction coil, alternating voltage is provided for electromagnetic induction coil.
The principle of electromagnetic induction heating is that the alternating current that power supply is produced produces alternating magnetic field by electromagnetic induction coil, is led
Magnetic bodies, which is placed in one, cuts alternate magnetic force line, so as to produce the electric current (being vortexed) of alternation in interior of articles, vortex makes thing
The atom high speed random motion in internal portion, atom collides with each other, rubbed and produces heat energy, so as to play the effect of heating article
Really.
Fusion sediment type 3D printer of the present utility model uses contactless electromagnetic induction heating mode, heating element heater
It need not be fixedly mounted on printing head, make the convenient dismounting of printing head；Sensing heating firing rate is fast, can improve printing effect
Rate.
Further to improve the convenience that the printhead of the utility model fusion sediment type 3D printer is dismounted, as excellent
Choosing, described supporting plate is connected with described stamp pad by movable dovetail slot structure.
Dovetail slot structure can be fixed by housing pin.Supporting plate is connected with stamp pad by movable dovetail slot structure,
The connected mode is simple in construction, can remove and install printhead on stamp pad without instrument, and printing can be changed as needed
Head, to adapt to wider printed material.
Preferably, described printing head includes：
Barrel, with the cavity for accommodating printed material, including：
Cylinder,
Cover, coordinate with the cylinder threaded one end on barrel, with pipe joint,
Barrel lower cover, coordinates with the cylinder other end screw thread, and with nozzle connector, the nozzle connector has outer
Screw thread；
Connection ring, inner peripheral surface has the internal thread with being cooperated on the nozzle connector for screw thread；
Nozzle, one end has discharging opening, and the other end has what is cooperated with the internal thread on the connection ring inner peripheral surface
External screw thread.
Printing head makes design using segmentation, be easy to disassemble printing head, clean and parts replacing.Beat
Using threaded connection between each section of shower nozzle of print, it is easy to the assembling of printing head, and make the accommodating chamber seal of printing head more
It is good.
Printing head of the present utility model can melt the material for liquid, such as water-setting with print liquid or at a certain temperature
Glue, acrylonitrile-butadiene-styrene (ABS) plastics (ABS plastic), PLA (PLA), low-melting-point metal etc.；Can directly it print
Grain or dusty material, and printed material need not be processed into silk, this provides possibility for the experiment of a small amount of printed materials, and
Substantially reduce the test period.
Preferably, described electromagnetic induction coil includes the first induction coil and the company of being enclosed on being enclosed on outside the barrel
Connect the second induction coil outside ring.
First induction coil is used for heating cylinder, and the second induction coil is used to heat nozzle in connection ring, by barrel and
Printing head is separately heated, and user can determine barrel temperature and printing head temperature according to the characteristic of printed material, for example, can
So that barrel is heated into relatively low temperature to melt printed material, then printed material is heated to at nozzle higher temperature,
To avoid printed material from occurring oxidation Decomposition in the condition of high temperature for a long time, compared with the printing head of traditional single temperature control,
The printing head scope of application of the present utility model is wider.
In order to accurately control the temperature of printing head, printing head temperature should be monitored in real time, preferably, the utility model
Fusion sediment type 3D printer also include infrared temperature inductive probe, the temperature for sensing the printing head, pass through sense
Probe bracket is answered to install on the supporting plate.
Printing head temperature is monitored using infrared temperature inductive probe, temperature element need not be fixedly mounted on printing head
On, further make the convenient dismounting of printing head.
Further, described infrared temperature inductive probe includes the first temperature sense for being used to sense the barrel temperature
It should pop one's head in and for sensing the second temperature inductive probe of the nozzle temperature.
Preferably, scribbling resistant to elevated temperatures black matrix paint on described barrel and the outer surface of connection ring.It is convenient for sensing
Heating and infrared measurement of temperature.
Preferably, described cooling device includes：
Motor；
Flabellum, on motor；
Motor fixing frame, for fixing motor, is fixedly mounted on the supporting plate.
Cooling device is that barrel and nozzle provide good radiating condition, makes printed material rapid cold after nozzle extrusion
But, it and can improve the temperature control speed and precision of barrel, nozzle, improve printing effect.
Preferably, fusion sediment type 3D printer of the present utility model also include Pneumatic controller, by conduit with
Described printing head is connected.
It is further preferred that fusion sediment type 3D printer of the present utility model also includes Pneumatic controller, by leading
Manage and be connected with the pipe joint on the barrel on lid.
It is further preferred that described Pneumatic controller includes：
Gas compressor, malleation is provided for barrel；
Vavuum pump, negative pressure is provided for barrel；
Control unit, is electrically connected with gas compressor and vavuum pump, unlatching and the pass of control gas compressor and vavuum pump
Close.
The Pneumatic controller of fusion sediment type 3D printer of the present utility model includes vavuum pump, as fusion sediment type 3D
When printer stops printing, vavuum pump provides negative pressure for barrel, it is to avoid the printed material melted in barrel is in self gravitation effect
Lower water clock, influences printing effect.
In order to improve printing effect, preferably, described stamp pad is provided with the printing panel for accepting printed material, institute
The printing panel stated has heating function.
Compared with prior art, the beneficial effects of the utility model are：
(1) fusion sediment type 3D printer of the present utility model is using contactless electromagnetic induction heating mode and infrared
Induction temperature sensing mode, heating element heater and infrared measurement of temperature element need not be fixedly mounted on printing head, printing head is conveniently torn open
Unload；
(2) supporting plate is connected with stamp pad by movable dovetail slot structure, can remove and install printhead without instrument
On stamp pad, printhead can be changed as needed；
(3) Pneumatic controller includes vavuum pump, and when fusion sediment type 3D printer stops printing, vavuum pump is barrel
There is provided negative pressure, it is to avoid the printed material melted in barrel water clock under self gravitation effect, influence printing effect.
Brief description of the drawings
Fig. 1 is the structural representation of stamp pad；
Fig. 2 is the structural representation of printhead；
Fig. 3 is the structural representation of printing head；
Fig. 4 is the schematic diagram of movable dovetail slot structure.
In figure：1st, bottom plate；2nd, panel is printed；3rd, X is to slide rail；31st, X is to sliding block；4th, Y-direction slide rail；41st, Y-direction sliding block；5、Z
To slide rail；6th, printhead；61st, supporting plate；611st, the first supporting plate；612nd, fixed dovetail frid；613rd, movable dovetail frid,
614th, positioning hole；615th, locating dowel；616th, housing pin；62nd, printing head；621st, covered on barrel；622nd, cylinder；623rd, barrel
Lower cover；624th, connection ring；625th, nozzle；63rd, printing head support；64th, the first induction coil；65th, the first induction coil support；
66th, the second induction coil；67th, the second induction coil support；68th, radiator fan；69th, cooling holder.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, the fusion sediment type 3D printer of fast changeable printing head of the present utility model includes bottom
Bottom plate 1, printing frame, printhead 6 and the drive printhead 6 that is erected in printing frame moved along X-axis, Y-axis and Z-direction
In motion, the present embodiment, Z-direction is vertical direction, and X-axis, Y-axis, Z axis are mutually perpendicular to two-by-two.
Also include gas compressor (not shown), malleation is provided for barrel；
Vavuum pump (not shown), negative pressure is provided for barrel；
Control unit (not shown), is electrically connected with gas compressor and vavuum pump, control gas compressor and vacuum
The open and close of pump.
Motion includes：
Two Y-direction slide rails 4, are separately fixed on two relative sides of stamp pad；Two Y-direction sliding blocks 41, are slided respectively
It is arranged on corresponding Y-direction slide rail 4, is fixed with corresponding Y-direction timing belt；Two Y-direction active synchronization wheeled stands, for inciting somebody to action
Y-direction stepping motor, Y-direction reductor and Y-direction active synchronization belt wheel are arranged on two Y-direction slide rails；The driven synchronous pulley branch of Y-direction
Frame, for the driven synchronous pulley of Y-direction to be arranged on into two Y-direction slide rails；Two Y-direction stepping motors, are driven by Y-direction timing belt
Two Y-direction sliding blocks 41 are moved.Every Y-direction belt, which coordinates, to be installed on Y-direction active synchronization belt wheel and the driven synchronous pulley of Y-direction.
Two Y-axis motors make constant velocity rotation under the driving for the synchronized signal that control unit is provided, and slow down by reductor
Drive two Y-direction active synchronization belt wheels to rotate afterwards, drive two Y-direction belt movements, and drive two Y-direction sliding blocks to make synchronization Y
To motion；
X is to slide rail 3, and two ends are separately fixed on two Y-direction sliding blocks；X is to sliding block 31, in X to sliding on slide rail 3, with X to
Timing belt is fixed, while having Z-direction chute；X to active synchronization wheeled stand, for by X to stepper motor, X to reductor and X
Two X are arranged on on slide rail to active synchronization belt wheel；X is to driven synchronous pulley support, for X to be pacified to driven synchronous pulley
Mounted in two X on slide rail；X is moved under the drive signal driving that control unit is provided, subtracted by reductor to stepper motor
X is driven to be moved to active synchronization belt wheel after speed, X drives the X coordinated with it to be moved to timing belt and then band to active synchronization belt wheel
Dynamic X is moved to sliding block 31；
Z-direction slide rail 5, with Z-direction chute routing motion from X to sliding block；Z-direction leading screw, coordinates with X to the screwed hole on sliding block 31
Motion；Z-direction stepping motor, is fixed on Z-direction slide rail, and Z-direction leading screw is driven under the driving for the drive signal that control unit is provided
Rotate, and then Z-direction slide rail 5 is made Z-direction to sliding block 31 relative to X and move.
As shown in Figures 2 and 3, printhead 6 is fixed on the lower end of Z-direction slide rail 5.Printhead 6 includes：
Supporting plate 61；
Printing head 62, is made of metal material, is fixed on by printing head support 63 in supporting plate 61；
Heater, including electromagnetic induction coil, the electromagnetic induction coil are enclosed on outside printing head 62, pass through coil brace
It is fixed in supporting plate 61；
Radiator fan 68, for cooling down printing head 62, is fixed in supporting plate 61 by cooling holder 69；
Circuit is controlled, is electrically connected with electromagnetic induction coil.
Printing head 62 includes：
Barrel, with the cavity for accommodating printed material, including：
Cylinder 622,
Lid 621 on barrel, coordinate, with pipe joint, pipe joint passes through conduit and gas with the threaded one end of cylinder 622
Compressor and vavuum pump connection,
Barrel lower cover 623, coordinates, with nozzle connector, nozzle connector has outer spiral shell with the other end screw thread of cylinder 622
Line；
Connection ring 624, inner peripheral surface has the internal thread with being cooperated on nozzle connector for screw thread；
Nozzle 625, one end has discharging opening, and the other end has to cooperate with the internal thread on the inner peripheral surface of connection ring 624
External screw thread.
Barrel and connection ring 624 are made of metal material, and outer surface scribbles black matrix paint.
Electromagnetic induction coil includes being enclosed on outer first induction coil 64 of barrel and the second induction coil 66, respectively by the first sense
The induction coil support 67 of coil brace 65 and second is answered to be fixed in supporting plate 61.
The two ends of first induction coil 64 and the second induction coil 66 are connected by wire with control unit respectively, in control
The lower generation alternating magnetic field of alternating current driving that unit is provided, vortex flow is produced in barrel and connection ring 624, heating material is played
The effect of cylinder and nozzle 625.
The fusion sediment type 3D printer of fast changeable printing head of the present utility model also includes being used to sense barrel
First temperature sense probe (not shown) of temperature and the second temperature inductive probe (figure for sensing the temperature of nozzle 625
Not shown in).
Detachably connect as shown in figure 4, supporting plate 61 of the present utility model is fixed by movable dovetail slot structure with Z-direction slide rail
Connect.
Movable dovetail slot structure includes：
First supporting plate 611, for carrying printhead 6；
Fixed dovetail frid 612, is fixed on the lower end of Z-direction slide rail 5；
Movable dovetail frid 613, is coordinated by locating dowel 615 with the positioning hole 614 on fixed dovetail frid 612；
Screwed hole on housing pin 616, with fixed dovetail frid 612 and movable dovetail frid 613 coordinates, and connection is compressed
Fixed dovetail frid 612 and movable dovetail frid 613, the end of housing pin 616 has the round end for being adapted to hand Screw.
The technical solution of the utility model and beneficial effect are described in detail embodiment described above, it should be understood that
Be that the foregoing is only specific embodiment of the utility model, be not limited to the utility model, it is all in the utility model
Spirit in any modification, supplement and the equivalent substitution made etc., should be included in protection domain of the present utility model it
It is interior.
Claims (10)
1. a kind of fusion sediment type 3D printer of fast changeable printing head, including stamp pad and printhead, its feature exist
In described printhead includes：
Supporting plate；
Printing head, is made of metal material, is fixed on the supporting plate by printing head support；
Heater, including electromagnetic induction coil, the electromagnetic induction coil are enclosed on outside printing head, are fixed on by coil brace
In supporting plate；
Cooling device, for cooling down printing head, is fixed on the supporting plate by cooling holder；
Circuit is controlled, is electrically connected with described electromagnetic induction coil, alternating voltage is provided for electromagnetic induction coil.
2. the fusion sediment type 3D printer of fast changeable printing head according to claim 1, it is characterised in that institute
The supporting plate stated is connected with described stamp pad by movable dovetail slot structure.
3. the fusion sediment type 3D printer of fast changeable printing head according to claim 1, it is characterised in that institute
The printing head stated includes：
Barrel, with the cavity for accommodating printed material, including：
Cylinder,
Cover, coordinate with the cylinder threaded one end on barrel, with pipe joint,
Barrel lower cover, coordinates, with nozzle connector, the nozzle connector has outer spiral shell with the cylinder other end screw thread
Line；
Connection ring, inner peripheral surface has the internal thread with being cooperated on the nozzle connector for screw thread；
Nozzle, one end has discharging opening, and the other end has the outer spiral shell cooperated with the internal thread on the connection ring inner peripheral surface
Line.
4. the fusion sediment type 3D printer of fast changeable printing head according to claim 3, it is characterised in that institute
The electromagnetic induction coil stated includes the first induction coil being enclosed on outside the barrel and second line of induction being enclosed on outside connection ring
Circle.
5. the fusion sediment type 3D printer of fast changeable printing head according to claim 3, it is characterised in that also
Including infrared temperature inductive probe, the temperature for sensing the printing head is arranged on supporting plate by inductive probe support
On.
6. the fusion sediment type 3D printer of fast changeable printing head according to claim 5, it is characterised in that institute
The infrared temperature inductive probe stated includes being used for the first temperature sense probe for sensing the barrel temperature and described for sensing
The second temperature inductive probe of nozzle temperature.
7. the fusion sediment type 3D printer of fast changeable printing head according to claim 3, it is characterised in that institute
The barrel stated and resistant to elevated temperatures black matrix paint is scribbled on the outer surface of connection ring.
8. the fusion sediment type 3D printer of fast changeable printing head according to claim 1, it is characterised in that institute
The cooling device stated includes：
Motor；
Flabellum, on motor；
Motor fixing frame, for fixing motor, is fixedly mounted on the supporting plate.
9. the fusion sediment type 3D printer of fast changeable printing head according to claim 3, it is characterised in that also
Including Pneumatic controller, it is connected by conduit with the pipe joint on the barrel on lid.
10. the fusion sediment type 3D printer of fast changeable printing head according to claim 9, it is characterised in that
Described Pneumatic controller includes：
Gas compressor, malleation is provided for barrel；
Vavuum pump, negative pressure is provided for barrel；
Control unit, is electrically connected with gas compressor and vavuum pump, the open and close of control gas compressor and vavuum pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621381569.8U CN206367193U (en) | 2016-12-15 | 2016-12-15 | A kind of fusion sediment type 3D printer of fast changeable printing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621381569.8U CN206367193U (en) | 2016-12-15 | 2016-12-15 | A kind of fusion sediment type 3D printer of fast changeable printing head |
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| Publication Number | Publication Date |
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| CN206367193U true CN206367193U (en) | 2017-08-01 |
Family
ID=59392837
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621381569.8U Active CN206367193U (en) | 2016-12-15 | 2016-12-15 | A kind of fusion sediment type 3D printer of fast changeable printing head |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493941A (en) * | 2016-12-15 | 2017-03-15 | 浙江大学 | A kind of fusion sediment type 3D printer of fast changeable printing head |
| CN109203701A (en) * | 2018-08-13 | 2019-01-15 | 合肥海闻自动化设备有限公司 | A kind of constant-temperature heating system of digital printer spray head |
| CN109866430A (en) * | 2019-04-03 | 2019-06-11 | 江苏海之风科技有限公司 | It is a kind of for monitoring the monitoring system of printed material temperature |
| CN110871567A (en) * | 2018-09-03 | 2020-03-10 | 三纬国际立体列印科技股份有限公司 | Three-dimensional printing method and three-dimensional printing device |
| CN111331844A (en) * | 2018-12-19 | 2020-06-26 | 财团法人工业技术研究院 | Plastic processing apparatus and method |
| US11065811B2 (en) | 2019-03-20 | 2021-07-20 | Essentium, Inc. | Three-dimensional printer head including an automatic touchdown apparatus |
| US11440252B2 (en) | 2018-07-26 | 2022-09-13 | Essentium, Inc. | High speed extrusion 3D printer nozzle |
-
2016
- 2016-12-15 CN CN201621381569.8U patent/CN206367193U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106493941A (en) * | 2016-12-15 | 2017-03-15 | 浙江大学 | A kind of fusion sediment type 3D printer of fast changeable printing head |
| CN106493941B (en) * | 2016-12-15 | 2018-12-25 | 浙江大学 | A kind of fusion sediment type 3D printer of fast changeable printing head |
| US11440252B2 (en) | 2018-07-26 | 2022-09-13 | Essentium, Inc. | High speed extrusion 3D printer nozzle |
| CN109203701A (en) * | 2018-08-13 | 2019-01-15 | 合肥海闻自动化设备有限公司 | A kind of constant-temperature heating system of digital printer spray head |
| CN110871567A (en) * | 2018-09-03 | 2020-03-10 | 三纬国际立体列印科技股份有限公司 | Three-dimensional printing method and three-dimensional printing device |
| CN111331844A (en) * | 2018-12-19 | 2020-06-26 | 财团法人工业技术研究院 | Plastic processing apparatus and method |
| US11065811B2 (en) | 2019-03-20 | 2021-07-20 | Essentium, Inc. | Three-dimensional printer head including an automatic touchdown apparatus |
| US11731353B2 (en) | 2019-03-20 | 2023-08-22 | Essentium Ipco, Llc | Three-dimensional printer head including an automatic touchdown apparatus |
| CN109866430A (en) * | 2019-04-03 | 2019-06-11 | 江苏海之风科技有限公司 | It is a kind of for monitoring the monitoring system of printed material temperature |
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