CN212219284U

CN212219284U - Detection apparatus for 3D print head mechanism

Info

Publication number: CN212219284U
Application number: CN201922133312.0U
Authority: CN
Inventors: 蒋铭波; 黄宇立; 杨振安; 罗小帆
Original assignee: Jf Polymers Suzhou Co ltd
Current assignee: Suzhou Jufu Technology Co ltd
Priority date: 2019-12-03
Filing date: 2019-12-03
Publication date: 2020-12-25
Anticipated expiration: 2029-12-03

Abstract

The invention provides a detection device of a 3D printer nozzle mechanism, which comprises but is not limited to the following components: the system comprises an extrusion system, a pressure testing mechanism and a control system, wherein the extrusion system is used for conveying, melting and extruding printing wire rods; the pressure testing mechanism is connected with the extrusion system to measure the extrusion pressure of the wire; and the control system is connected with the extrusion system and the pressure testing mechanism. Adopt the device to detect shower nozzle mechanism, printing speed that can be different, printing temperature, pumpback distance isoparametric carry out the melting of 3D printing wire rod and extrude, test and the expression extrusion pressure, exit temperature, extrude the action of extruding such as bloated, nozzle hourglass material, carry out statistical analysis to test data, can evaluate the suitability of test wire rod and shower nozzle mechanism, find the best service condition of wire rod.

Description

Detection apparatus for 3D print head mechanism

Technical Field

The utility model relates to a 3D prints technical field, concretely relates to detection device of 3D print head mechanism.

Background

Fused Deposition manufacturing (fdm) is a common 3D printing technique, and the material is generally a thermoplastic material, such as PLA, ABS, nylon, etc., and is fed in a linear form, and the material is heated and melted in a nozzle. The spray head moves along the section contour and the filling track of the part, and simultaneously extrudes the molten material, and the material is rapidly solidified and coagulated with the surrounding material.

The material is the core of the 3D printing technology, the spray head is the core component of the FDM type 3D printer, the printing temperature and the printing speed are the core parameters of the material working on the printer, but no mature equipment and method can rapidly test the material and the spray head structure to verify whether the parameters are matched at the present stage. Generally, a specific model can be printed only through actual 3D, and then feedback is carried out according to the printing quality of the model, interference factors are excessive in the process, and the test period is long.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a detection device and method of 3D print head mechanism, the device can realize the aspect that the equipment that exists at present can not test, extrude measuring of the temperature in the twinkling of an eye, material from nozzle department and extrude the measurement of "nozzle flash" and material from nozzle department after stopping including measurement of wire rod extrusion pressure, material from nozzle department when extruding measurement of "extrusion swelling".

The utility model discloses a realize like this:

detection apparatus for 3D print head mechanism, include

The extrusion system is used for conveying, melting and extruding the printing wire;

the pressure testing mechanism is connected with the extrusion system and used for supporting the extrusion system so as to measure the extrusion pressure of the wire rod;

and the control system is connected with the extrusion system and the pressure testing mechanism.

Preferably, the extrusion system comprises a wire conveying mechanism, and the wire conveying mechanism is used for conveying the printing wire to the pressure testing mechanism.

In detail, the wire conveying mechanism is one or more of a motion mechanism comprising a gear, a shaft, a belt, a roller and a motor; the motor is connected with the control system.

In detail, the extrusion system further comprises a wire heating mechanism, the wire heating mechanism comprises a nozzle and a heating block connected with the control system, and the nozzle is located below the wire conveying mechanism and used for receiving the printing wire conveyed by the wire conveying mechanism; the heating block is located on the outer side of the nozzle and used for heating and melting the printing wire.

More specifically, the wire heating mechanism further comprises a thermocouple, a heating rod and a temperature controller which are connected with the control system, and the thermocouple and the heating rod are arranged on the heating rod and connected with the temperature controller.

Furthermore, the extrusion system further comprises a meter counting mechanism connected with the control system, and the meter counting mechanism is arranged above the wire conveying mechanism and used for measuring the moving length of the printing wire.

Further, the meter mechanism is an electronic meter.

Furthermore, the detection device also comprises an optical image system connected with the control system

Preferably, the optical imaging system is a visible light imaging system or/and an infrared light imaging system, which is adjacent to the nozzle to photograph the outlet of the nozzle.

Preferably, the device also comprises a nozzle wiping mechanism connected with the control system, wherein the nozzle wiping mechanism is adjacent to the nozzle and used for wiping the outlet of the nozzle.

As a preferred scheme, the nozzle wiping mechanism comprises a stepping motor and a nozzle wiping block, wherein the stepping motor drives the nozzle wiping block to rotate in a reciprocating manner, so that the nozzle is quickly wiped by the nozzle wiping block; the stepping motor is connected with the control system.

As a preferable scheme, the pressure testing mechanism comprises at least one pull pressure sensor, a pull pressure sensor instrument which is connected with all the pull pressure sensors and is used for reading pressure values; one end of the pull pressure sensor is fixed, and the other end of the pull pressure sensor is suspended to support the nozzle; the pressure sensor and the pull pressure sensor instrument are connected with the control system.

Preferably, the pull pressure sensor includes, but is not limited to, an S-type pull pressure sensor, an L-type high pull pressure sensor, and a U-type pull pressure sensor.

As a preferable scheme, the wire conveying mechanism is located above the tension and pressure sensor, and a pipeline for the printing wire to pass through is arranged on the wire conveying mechanism.

As a preferable scheme, a conveying pipeline which is coaxial with the pipeline in the wire rod conveying mechanism is arranged in the wire rod heating mechanism, and the distance between the two pipelines is not more than 10 mm; when the size of the wire is 1.75mm, the inner diameters of the two pipelines are 1.75 mm-2.5 mm; when the size of the wire is 2.85mm, the inner diameters of the two pipelines are

2.85mm～3.5mm。

And simultaneously, the utility model also provides a method of using above-mentioned detection device to come to detect 3D print head mechanism.

The method is realized by the following steps:

a method for detecting 3D printer nozzle mechanism parameters by using the device comprises the following steps:

A. installing a detection device, and inserting the 3D printing wire into the nozzle after passing through the pipeline of the wire conveying mechanism;

B. starting the device to melt and extrude the wire;

C. the extrusion behaviour of the material on the equipment was tested and characterised.

Preferably, the extrusion behavior comprises one or more of extrusion pressure, die swell, exit temperature and nozzle blowby.

In detail, the method specifically comprises the following steps:

A. manually enabling the printing wire to pass through the metering mechanism and be inserted into the wire conveying mechanism; when the printing wire moves, a wheel on the metering mechanism is driven to rotate, and the mechanism records the actual length of the conveyed wire;

B. the wire conveying mechanism conveys the wires into the wire heating mechanism, and the wires are extruded from the outlet of the nozzle after being heated and melted by the wire heating mechanism; in the process, the wire can press the nozzle downwards, so that the tension pressure sensor works to measure the extrusion pressure;

C. in the stable extrusion process, the wires are extruded into thinner filiform wires at the nozzle; shooting the extruded material through an optical imaging system to obtain images of extrusion swelling and nozzle leakage;

D. during stable extrusion, the infrared imaging system measures the exit temperature of the material immediately after extrusion at the nozzle.

Adopt the utility model discloses a detection device carries out the method and the principle that detect to 3D printer extrusion mechanism parameter as follows:

1. the wire rod is manually inserted into the wire rod conveying mechanism after passing through the metering mechanism. The wire is moved to rotate a wheel on a metering mechanism which records the actual length of the wire as it is conveyed.

2. The control system controls the wire rod conveying mechanism, the conveying wire rods enter the wire rod heating mechanism, and the wire rods are extruded out from the nozzle after being heated and melted in the wire rod heating mechanism. In the process, the wire presses the nozzle downwards, the pressure is transmitted to a pressure testing mechanism, and the measured pressure is the extrusion pressure of the wire.

3. In the stable extrusion process, the strand is extruded into a thinner filamentous strand at the nozzle, and due to the characteristics of the high polymer material, when some materials are melt-extruded through a small hole, the size of the extruded strand is larger than that of the small hole, and the diameter of the filamentous strand is larger than the inner diameter of the nozzle outlet, which is the 'extrusion swelling' behavior.

4. And at a certain set moment, the control system controls the nozzle wiping mechanism to clear the material extruded from the nozzle, and the wire conveying mechanism stops conveying.

5. The wire rod staying in the wire rod heating mechanism is reduced in viscosity and even degraded due to the continuous heating effect, and the material can leak from the nozzle due to the multiple influences of factors such as thermal expansion, gravity action and the like of the material, so that the action of 'nozzle leakage' is realized.

6. In the whole test process, the optical image system records the visible light image and the infrared light image of the nozzle area.

7. The visible light image is processed by software. 1) The diameter of the wire in the "die swell" behavior was measured and used to characterize the extent of "die swell". 2) The time from the start of the removal of the material extruded at the nozzle to the occurrence of the "nozzle bleed" behavior in the "nozzle bleed" behavior was measured and the extent of the "nozzle bleed" was characterized by the period of no bleed time.

8. The infrared light effect was processed with software to measure the actual temperature of the material immediately after it was extruded at the nozzle. This is the "outlet temperature".

9. And (4) carrying out statistical analysis on the measured extrusion pressure, the measured extrusion swelling degree, the measured nozzle leakage degree and the measured outlet temperature to evaluate whether the wire rod and the sprayer mechanism are matched or not.

The utility model has the advantages that:

(1) adopt the utility model discloses a detection device and method can realize the aspect that equipment that exists at present can not test, if realize the measurement to wire extrusion pressure through pressure test mechanism, infrared image system realizes that the material extrudes the measurement of temperature in the twinkling of an eye from the nozzle, and "extrude bloated" and extrude the measurement of "nozzle flash" after stopping from the nozzle when the material is extruded from the nozzle to realize through optical image system.

(2) The utility model discloses the device can be used to on-line monitoring and record and print the temperature, extrude pressure, flow, material and extrude data such as temperature in the twinkling of an eye, reacts the condition of extruding of wire rod. Such as: the wire rod is extruded on this device, can test the pressure of extruding, line footpath data in the extrusion process. After the data are subjected to statistical analysis, whether the current temperature and speed are suitable for the material can be evaluated, and the most suitable printing temperature and printing speed of a certain material can be judged by adjusting the temperature and the extrusion speed of the wire conveying mechanism, so that the testing efficiency is higher compared with the traditional method.

(3) Through right the utility model discloses the data that the measurement of device obtained carry out the analysis, also can provide the feedback suggestion to the design of shower nozzle, guide 3D printer producer to the design of shower nozzle mechanism.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a schematic view of the installation of the nozzle mechanism of the present invention;

FIG. 3 is a detail view of the nozzle mechanism of the present invention;

fig. 4 is a schematic structural view of the nozzle wiping mechanism of the present invention.

Icon:

1-spray head mechanism, 11-wire rod conveying mechanism, 12-spray nozzle, 13-wire rod heating mechanism, 14-wire rod heating mechanism fixing beam, 15-spray nozzle fixing plate, 2-spray head wiping nozzle mechanism, 21-wiping nozzle mechanism mounting table, 22-spray head wiping block, 23-stepping motor mounting seat, 24-stepping motor, 3-instrument table frame, 4-pulling pressure sensor instrument, 5-temperature controller, 51-heating block, 52-heating rod, 53-thermocouple, 6-optical imaging system, 7-processor, 8-spray head mounting plate and 9-printing wire rod.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the present disclosure, unless otherwise expressly stated or limited, the first feature may comprise both the first and second features directly contacting each other, and also may comprise the first and second features not being directly contacting each other but being in contact with each other by means of further features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.

Example (b):

in the prior art, a certain heating temperature and a certain printing speed are usually set before 3D printing, a linear material is melt-extruded in a nozzle, and an actual temperature (i.e., an outlet temperature) of the material extruded from the nozzle is generally lower than a set value, and the actual temperature is influenced by the set heating temperature and the set printing speed, and at present, there is no method for specially testing the actual temperature. Meanwhile, the actual temperature of the material has a great influence on the viscosity of the material, generally speaking, the lower the temperature, the higher the viscosity of the material, which requires that the extruder of the nozzle mechanism can provide a strong extrusion pressure to extrude the linear material from the nozzle, and no instrument or method can test the extrusion pressure specially at present. Furthermore, there is a "head flash" problem after the material stops extruding, and there is currently no equipment to quantitatively test the extent of flash.

Therefore, the embodiment particularly provides a detection device and a detection method for a 3D printer nozzle mechanism, and the main purpose of the detection device is to perform rapid test on the material and the nozzle structure of a 3D printer so as to verify whether the parameters are matched. The above-mentioned problems are avoided. Electric components among its whole device all links to each other with control system (for 3D printer self electrical system, perhaps the treater 7 that the embodiment pointed out), and its concrete circuit and theory of operation are the same with prior art, except that the relation of connection, other all are the utility model discloses modified utility model point, it is not repeated here.

Specifically, referring to fig. 1, the detection apparatus of the present embodiment mainly includes an extrusion system (a meter counting mechanism, a wire rod conveying mechanism 11, and a wire rod heating mechanism 13), a nozzle wiping mechanism 2, an instrument rack 3, a pressure testing mechanism, an optical imaging system 6, and a processor 7; the main purpose of the detection is to detect the nozzle mechanism 1 and its printing wire 9 (linear material) configured in the conventional 3D printer. Generally, the printing wire is extruded from the wire conveying mechanism, enters the wire heating mechanism to be heated and melted, and then is extruded.

The device of the embodiment is designed for detecting the parameters involved in the process. First, the wire conveying mechanism 11 is a set of gear set with a reduction ratio, a screw hole is formed on the gear, the gear is firmly connected with a shaft of a motor of the stepping motor through a set screw, and when the motor rotates, the gear set is driven to rotate, so that the linear material is rolled into the extruding mechanism and conveyed downwards. The entire wire feeding mechanism 11 is mounted on the instrument stand 3 without pressure being built into the wire heater. The wire heating mechanism 13 comprises a nozzle 12, a heating block 51, a heating rod 52 and a temperature controller 5 which are connected with a control system, the wire heating mechanism is positioned below the wire conveying mechanism and is used for receiving the printing wires 9 transmitted by the wire conveying mechanism, and the outlet of the nozzle is a molten wire discharge port; the heating block is arranged on the outer side of the nozzle, the heating rod is arranged in the heating block, and is connected with the temperature controller 5 through a thermocouple and used for heating and melting the printing wire; the temperature controller is connected with the nozzle.

In detail, the meter counting mechanism can adopt a conventional meter counter, and is mainly used for counting the length of the wire entering the whole device. Which can be fixed to the instrument stand 3 by means of a 7-shaped bracket. The pressure testing mechanism comprises a pull pressure sensor meter 4 and two pull pressure sensors 41. Wherein, the processor 7 can be a conventional processor such as a 51 singlechip or an ARM processor, and the installation position thereof can be optional. Instrument rack 3 is cuboid to vertically place on ground or other platforms, instrument rack 3's top is from the past to back with this mounting groove that is provided with shower nozzle mechanism mounting groove and other test component. Wherein, the mounting grooves of other testing components are used for mounting the pull pressure sensor instrument 4 and the temperature controller 5 which are respectively connected with the processor 7. And the instrument rack 3 at the mounting groove of the other testing components is also provided with a cantilever, the optical image system 6 is arranged on the cantilever and faces to the discharge hole of the nozzle so as to shoot the discharge condition and the material wiping condition of the nozzle in real time, judge the material overflowing time and the like through shooting intervals or video recording and the like, and meanwhile, as the wire is heated and melted, the wire is extruded into a thinner filamentous material from the nozzle, and the lens of the optical image system is aligned with the nozzle, so that the extruded filamentous material can be subjected to optical diameter measurement and temperature detection. The optical image system is a visible light or infrared light image system, and can directly select a common visible light and infrared light double-identification analysis intelligent all-in-one machine in the market.

Referring to fig. 2, a door-shaped nozzle mounting plate 8 is further disposed on the nozzle mechanism mounting groove, the motor portion of the wire conveying mechanism is fixed above the nozzle mounting plate 8, and the wire extruding portion (generally, a gear train extruding portion, which is a gear train portion, is not improved in this embodiment and is not described herein) of the wire conveying mechanism is suspended at the right side of the instrument rack 3. The two pull pressure sensors 41 are electrically connected with the pull pressure sensor instrument 4, one ends of the two pull pressure sensors are fixed below the spray head mounting plate 8, and the other ends of the two pull pressure sensors are suspended below the line squeezing part; a wire heating mechanism fixing beam 14 is arranged above the two tension pressure sensors 41 at the position corresponding to one end of the wire outgoing part, and the upper part of the nozzle 12 is fixed on the wire heating mechanism fixing beam 14 through a heat dissipation sleeve 15. The wire heating mechanism fixing beam supports the wire heating mechanism, namely the representative tension and pressure sensor 41 supports the wire heating mechanism, and the measuring part of the tension and pressure sensor 41 corresponds to the wire heating mechanism fixing beam, so that the wire extrusion pressure can be measured through the tension and pressure sensor. Here, the port for feeding the wire heating mechanism should be located on the same vertical line as the port for discharging the wire extruding portion to avoid the influence of the force on the nozzle in the horizontal direction on the measurement result. It should be noted that, referring to fig. 3, the wire heating mechanism and the wire conveying mechanism are only connected by the printing wire, and the two mechanisms are prevented from being in contact with each other.

Referring to fig. 4, the nozzle wiping mechanism 2 is located below the nozzle and used for wiping the discharge hole of the nozzle mechanism after extrusion. Specifically, the nozzle wiping mechanism 2 comprises a nozzle wiping mechanism mounting table 21, a nozzle wiping block 22, a stepping motor mounting seat 23 and a stepping motor 24. The nozzle wiping mechanism mounting table 21 is in a rectangular block shape, the left side of the nozzle wiping mechanism mounting table is fixed on the instrument rack 3 through bolts, the right side of the nozzle wiping mechanism mounting table is longitudinally provided with two sliding grooves, and screw holes are formed in the sliding grooves. The stepping motor mounting seat is designed to be in a hollow block shape, a convex block corresponding to the sliding groove is arranged on the right side face of the stepping motor mounting seat, a through hole corresponding to the screw hole is also formed in the convex block, and when the stepping motor mounting seat is fixed, the stepping motor mounting seat can be inserted into the through hole and the screw hole only through bolts. So set up, can be in the height of certain extent adjustment step motor mount pad. The stepping motor is arranged in the stepping motor mounting seat, and the upper end face of the stepping motor is fixed with the upper surface of the stepping motor mounting seat through bolts. The middle part of the upper surface of the mounting seat of the stepping motor is provided with a circular through hole, the output end of the stepping motor extends upwards from the circular through hole and then is connected with the nozzle wiping block so as to drive the nozzle wiping block to rotate on the horizontal plane, and further the discharge hole of the nozzle is wiped.

In order to better understand the detection device and method of the present application, several test experiments are described in detail below.

"Material extrusion Condition test

The test purpose is as follows: and finding the optimal printing temperature and printing speed of the material.

And (3) testing conditions are as follows: nozzle diameter 0.4mm, material code F1.

The test scheme is as follows: if the material F1 has different extrusion behaviors at the nozzle during extrusion at different temperatures and speeds, the current temperature and speed condition is comprehensively judged whether to accord with the extrusion of the material by recording three values of printing temperature, printing speed and extrusion pressure and the surface quality of the extruded wire material at the nozzle recorded by the shooting of an image system in the experimental process.

1. The wire rod passes through the meter counter and is manually inserted into the pipeline of the wire rod conveying mechanism;

2. setting the temperature, and starting heating the heating block part of the wire heating mechanism;

3. after the wire rod is heated to a set temperature, the wire rod conveying mechanism conveys the wire rod to the wire rod heating mechanism at a certain speed;

4. the wire finally reaches the nozzle through a wire heating mechanism (the flow is not improved in the application, so that the detailed description is not given, and the structure diagram of the existing spray head mechanism can be directly referred to), at the moment, due to the continuous conveying of the wire conveying mechanism, the wire can cause downward extrusion on the nozzle, the pressure is transmitted to a pressure sensor, and a processor reads a pressure value; meanwhile, the wire is melted and extruded, and is extruded into a thinner filamentous material from a nozzle, and the image system shoots the material. The diameter of the extruded material can be measured by processing the effect using software.

5. The printing temperature, printing speed, extrusion pressure and wire diameter data in the process can be recorded by the processor for subsequent analysis and processing.

And (4) analyzing results:

e.g. at temperature T₁Velocity S₁The test is carried out under the parameters, the average value of the pressure value is 10N, the standard deviation is +/-3N, and the wire diameter is 0.6 mm.

Generally, according to the fluctuation range of the extrusion pressure, the pressure can be judged to be unstable firstly; the diameter of the combined extruded filament wire is measured to be 0.6mm, the diameter of the nozzle is only 0.4mm, and the obvious 'extrusion swelling' behavior exists, so that the situation that the material is not sufficiently melted can be further judged, and the printing temperature needs to be increased or the printing speed needs to be reduced.

According to the analysis result, the test is repeated with the temperature increased by 5 ℃ (or decreased by a certain speed) until the pressure is stable and the diameter of the extruded filament approaches 0.4mm, the current temperature T can be judged₂Velocity S₂Is the best parameter of the material.

And (3) testing results: printing temperature T₁Printing speed S₁Under the condition, the wire rod is not matched with the spray head mechanism.

Optimum printing temperature of T₂Printing speed of S₂。

Second, nozzle leakage test

The test purpose is as follows: and (4) representing the material leakage degree of the material, and finding the optimal parameters such as temperature, pumping-back distance and the like.

And (3) testing conditions are as follows: nozzle with diameter of 0.4mm and material code F₂

The test scheme is as follows: the material leaks under different printing temperature, pumpback distance parameter, leaks the material and can have different expressions at the nozzle, and the material degree of leaking of material is represented through testing no material leaking time in the experimentation.

The test flow comprises the following steps:

1. the wire rod passes through the meter counter and is manually inserted into the pipeline of the wire rod conveying mechanism

2. Setting the temperature, and starting heating the heating block part of the spray head mechanism;

3. after the wire rod is heated to the set temperature, the control system controls the wire rod conveying mechanism to convey the wire rod to the nozzle end at a certain speed;

4. continuously extruding the wire, wherein when the wire is extruded out, the motor of the cleaning mechanism rotates instantly, and the wire-shaped material which is just extruded out is erased by the erasing block; meanwhile, the image system records the whole testing process. And (4) processing the influence by using software, and measuring the time without material leakage in the process.

5. The data of printing temperature, printing speed, extrusion pressure, wire diameter, no material leakage time and the like in the process can be recorded for subsequent analysis and processing.

And (4) analyzing results:

e.g. at temperature T₁Velocity S₁A withdrawal distance D₁Testing under the parameters to obtain the time t without material leakage₁3s, extrusion pressure 10 +/-0.5N and wire diameter 0.4 mm.

For material F₂In general, it can be considered that the extrusion pressure is stable, and the 'extrusion swelling' behavior is not obvious, and the printing temperature T is firstly judged₁And a printing speed S₁The parameters are within suitable ranges.

Combined with no-leakage time t₁Is 3s, the material leakage degree can be judged to be serious under general conditions, and the pumping-back distance D is₁Shorter. According to the analysis results, the withdrawal distance should be increased by 2mm and the test repeated until the missing time t₂The draw-back distance D can be judged to be the draw-back distance D at the moment when the reduction is obvious (more than 50 percent)₂Is the best parameter.

And (3) testing results: withdrawal distance D₁Under the condition, the wire rod is not matched with the nozzle mechanism

Under appropriate conditionsComprises the following steps: printing temperature of T₁Velocity S₁A withdrawal distance D₂Time t of no material leakage₂。

Therefore, the equipment can be used for monitoring and recording data such as printing temperature, printing speed, extrusion pressure, outlet temperature, extrusion swelling, nozzle leakage and the like on line to reflect the adaptability of the wire and the nozzle mechanism. And when the printing parameters are not allowed to be changed, feedback opinions can be provided for the design of the spray head through the analysis result of the detection data, and opinions are provided for a 3D printer manufacturer to the design of the spray head mechanism, such as whether the heating power is enough or not, and how much force can be provided by the limit of the wire conveying mechanism.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a detection device of 3D print head mechanism which characterized in that includes:

an extrusion system for conveying, melting, extruding a printing wire (9);

2. The detection device of a 3D printer head mechanism according to claim 1, characterized in that the extrusion system comprises a wire feeding mechanism (11) which feeds a printing wire (9) to a pressure testing mechanism.

3. The detection device of the 3D printer nozzle mechanism according to claim 2, wherein the wire conveying mechanism (11) is one or more of a motion mechanism comprising gears, shafts, belts, rollers and motors; the motor is connected with the control system.

4. The detection device of a 3D printer head mechanism according to claim 2 or 3, characterized in that the extrusion system further comprises a wire heating mechanism (13), the wire heating mechanism comprises a nozzle (12), a heating block and a thermocouple, a heating rod and a temperature controller connected with the control system, the heating block is positioned outside the nozzle and is used for heating and melting the printing wire (9).

5. The detection device of the 3D printer nozzle mechanism according to claim 4, wherein the wire heating mechanism (13) is located below the wire conveying mechanism (11) and is used for receiving the printing wire (9) conveyed by the wire conveying mechanism (11).

6. The detection device of a 3D printer nozzle mechanism according to claim 5, characterized in that the extrusion system further comprises a metering mechanism connected with the control system, the metering mechanism is arranged above the wire conveying mechanism (11) and is used for measuring the moving length of the printing wire (9).

7. The detecting device for the 3D printer nozzle mechanism according to claim 6, wherein the meter mechanism is an electronic meter.

8. The detecting device for the 3D printer nozzle mechanism according to any one of claims 5 to 7, characterized by further comprising an optical imaging system (6) connected with the control system.

9. The detecting device for the 3D printer nozzle mechanism according to claim 8, characterized in that the optical imaging system is a visible light imaging system or/and an infrared light imaging system, which is adjacent to the nozzle (12) to photograph the outlet of the nozzle.

10. The detection device for the 3D printer nozzle mechanism according to claim 9, further comprising a nozzle wiping mechanism (2) connected to the control system, wherein the nozzle wiping mechanism is adjacent to the nozzle (12) and is used for wiping the outlet of the nozzle.

11. The detection device for the 3D printer nozzle mechanism according to claim 5, wherein the nozzle wiping mechanism (2) comprises a stepping motor (24) and a nozzle wiping block (22), and the stepping motor drives the nozzle wiping block to rotate back and forth to enable the nozzle wiping block to wipe the nozzle (12); the stepping motor is connected with the control system.

12. The detecting device for the 3D printer nozzle mechanism according to claim 10, wherein the pressure testing mechanism comprises at least one pull pressure sensor (41), a pull pressure sensor meter (4) connected with the pull pressure sensor and used for reading a pressure value; wherein one end of the tension and pressure sensor (41) is fixed, and the other end is suspended to support the wire heating mechanism (13); the pressure sensor and the pull pressure sensor instrument are connected with the control system.

13. The detecting device for the 3D printer nozzle mechanism according to claim 12, wherein the pulling and pressing force sensor (41) includes but is not limited to an S-shaped pulling and pressing force sensor, an L-shaped high pulling and pressing force sensor, and a U-shaped pulling and pressing force sensor.

14. The detection device of the 3D printer nozzle mechanism according to claim 13, wherein the wire conveying mechanism (11) is located above the tension and pressure sensor (41), and a pipeline for the printing wire (9) to pass through is arranged on the wire conveying mechanism.

15. The detection device for the 3D printer nozzle mechanism according to claim 14, wherein a conveying pipeline coaxial with the pipeline in the wire conveying mechanism (11) is arranged in the wire heating mechanism (13), and the distance between the two pipelines is not more than 10 mm; when the size of the wire is 1.75mm, the inner diameters of the two pipelines are 1.75 mm-2.5 mm; when the size of the wire is 2.85mm, the inner diameters of the two pipelines are 2.85 mm-3.5 mm.