FDM3D printer nozzle mechanism with pricking needles

Abstract

The invention discloses an FDM3D printer nozzle mechanism with pricking needles. The FDM3D printer nozzle mechanism comprises a nozzle body, the nozzle mechanism main body is used for mounting all parts of the printer nozzle mechanism; the feeding assembly is used for conveying required consumables in the printing process; the cooling assembly is used for taking away heat of the feeding pipe; the heating assembly is used for providing heat for the nozzle; the nozzle melts the consumables into liquid and sprays out the liquid according to a program, and finally a workpiece is formed; the printing substrate is a bearing body of a printing workpiece, and one layer of the printing substrate sinks when one layer of the printing substrate is printed; the nth layer and the (n-1) th layer are sewn together through the pricking needle, so that the connection strength of the nth layer and the (n-1) th layer is greatly improved; and the reciprocating pushing assembly is used for driving the pricking needle to reciprocate up and down. The problems that a printed workpiece is low in Z-direction connection strength and prone to cracking are effectively solved. And the Z-direction strength of the printed workpiece is improved, the application range of the printed workpiece is expanded, and the design difficulty of the 3D printed workpiece is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of 3D printing, and in particular to an FDM 3D printer nozzle mechanism with a needle. Background Art

[0002] The current FDM3D printers use the layer-by-layer printing principle, with interlaced fibers in the XY direction, which results in higher strength. However, there is no interlacing of fibers in the Z direction, so the strength is very low. This low interlayer bonding strength has always been a drawback and defect of the FDM3D printing process, and is also a technical barrier that prevents the FDM3D printing process from fully replacing traditional workpieces.

[0003] Due to the above defects, the application scope of FDM3D printed workpieces is greatly reduced, and they can only be used in scenarios with very low strength requirements in the Z direction. At the same time, the design of the printed workpieces has also caused certain limitations, and the problem of low interlayer strength can only be avoided through design, such as increasing the size of the parts to make up for the problem of insufficient strength.

[0004] As mentioned above, the principle defects of the current FDM3D printers have caused a series of problems such as a small range of use of printed parts, difficulty in designing printed parts, and larger size of printed parts under the same strength requirements. Summary of the invention

[0005] The present invention provides an FDM 3D printer nozzle mechanism with a needle. The purpose of the present invention is to provide a function that can connect the current printing layer with the previous layer by needle during the printing process, so as to solve the above-mentioned problem.

[0006] An FDM 3D printer nozzle mechanism with a needle, comprising:

[0007] The nozzle mechanism body is used to install all parts of the printer nozzle mechanism;

[0008] A feeding assembly, used for delivering the consumables required for the printing process;

[0009] The cooling component is used to take away the heat from the feeding pipe, so that the temperature of the feeding pipe is at a low temperature, allowing the filament to enter the nozzle smoothly;

[0010] The heating component is used to provide heat to the nozzle and ensure that the nozzle temperature is within a certain threshold range, so as to ensure smooth melting of the filament and smooth printing;

[0011] The nozzle is installed at the bottom of the heating block in the heating assembly. It melts the consumable into liquid, sprays it out according to a certain procedure, and cools it into a certain shape of features to finally form the workpiece;

[0012] The printing substrate is a carrier for printing workpieces. Each time a layer is printed, the printing substrate sinks a layer.

[0013] The needle is a key part of the mechanism. Its function is to pierce the n-1 layer at a certain rhythm when the workpiece prints the nth layer, bringing part of the molten nth layer into the n-1 layer, and at the moment the needle retracts, bringing the material of the n-1 layer into the nth layer, so that part of the material of the nth layer is embedded in the n-1 layer under high temperature, and part of the material of the n-1 layer is embedded in the nth layer, so that the nth layer and the n-1 layer have a mutual embedding mechanism, which is equivalent to sewing the nth layer and the n-1 layer together through the needle, so that the connection strength between the nth layer and the n-1 layer is greatly increased;

[0014] The reciprocating driving assembly is used to drive the needle to perform up and down reciprocating motion.

[0015] As a further technical solution of the present invention, the feeding assembly includes a spring, a pressure wheel bracket, a pressure wheel, an extruder motor and a feed gear:

[0016] A spring, which is mounted on the nozzle mechanism body, and the spring provides continuous elastic pressure to the pressing wheel through the pressing wheel bracket, so that the consumables can be fed smoothly and effectively;

[0017] The pressure wheel bracket is installed on the main body of the nozzle mechanism. The pressure wheel is installed on the pressure wheel bracket. The pressure wheel cooperates with the feeding gear to provide continuous feeding force for the consumables to ensure printing requirements;

[0018] The extruder motor receives the feed signal sent by the host to rotate, drives the feed gear, and then delivers the required consumables for the printing process. The consumables are inserted between the feed gear and the pressure wheel, and the consumables pass through the feed pipe at the same time.

[0019] As a further technical solution of the present invention, the cooling assembly comprises:

[0020] A heat dissipation fin, which is arranged on one side of the feed pipe and is used to increase the heat dissipation area;

[0021] The heat dissipation fan is arranged on one side of the heat dissipation fins. The heat dissipation fan takes away the heat from the feed pipe, so that the temperature of the feed pipe is kept at a low temperature, allowing the consumables to enter the nozzle smoothly.

[0022] As a further technical solution of the present invention, the heating component comprises:

[0023] A heating block, which provides heat for the nozzle, and the bottom end of the feed pipe is inserted into the heating block;

[0024] A temperature sensor is used to detect the temperature of the heating block so that the temperature is kept within a certain threshold range;

[0025] The heating rod is used to heat the heating block so that the temperature of the nozzle reaches the melting temperature of the filament.

[0026] As a further technical solution of the present invention, the reciprocating driving assembly includes:

[0027] The needle holder is used to install the needle and drive the needle to reciprocate. The pin on the needle holder is used to keep the needle holder to reciprocate up and down without rotating. At the same time, the positioning arm on the needle holder is used to block the sensing slot of the photoelectric sensor, so as to detect whether the position of the needle is in the upper position (non-piercing) state;

[0028] The puncture needle return spring is used to give the puncture needle holder an upward elastic force so that the puncture needle holder is in an upper position under non-puncture conditions;

[0029] A cam is mounted on the main shaft of the needle motor and is used to convert the rotary motion of the needle motor into the reciprocating motion of the needle. The needle motor provides power for the high-speed reciprocating motion of the needle.

[0030] Photoelectric sensor, used to detect the position of the needle holder, in order to ensure that the needle is in the upper position when not in operation;

[0031] The cam controller controls the position of the cam by driving the needle motor, thereby controlling the moving position of the needle. The signal of whether the needle is in the upper position is detected by the photoelectric sensor, and the signal is transmitted to the cam controller.

[0032] Beneficial effects achieved by the present invention:

[0033] The present invention introduces an FDM 3D printer nozzle mechanism with a needle, which effectively solves the problem of low connection strength and easy cracking of the printed workpiece in the Z direction, increases the Z-direction strength of the printed workpiece, expands the application range of the printed workpiece, and reduces the design difficulty of the 3D printed part. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of an FDM 3D printer nozzle with a needle.

[0035] Figure 2 This is a left view of an FDM 3D printer nozzle mechanism with a needle.

[0036] Figure 3 This is an overall schematic diagram of the upper position of the needle of an FDM3D printer nozzle mechanism with a needle.

[0037] Figure 4 This is a schematic diagram of the upper part of the needle of an FDM 3D printer nozzle mechanism with a needle.

[0038] Figure 5 It is an overall schematic diagram of the lower position of the nozzle mechanism of an FDM 3D printer with a needle.

[0039] Figure 6 This is a schematic diagram of the lower part of the needle of an FDM 3D printer nozzle mechanism with a needle.

[0040] Figure 7 This is a diagram of the needle's working motion trajectory.

[0041] Notes on the figure numbers: 1-spring, 2-pressing wheel bracket, 3-pressing wheel, 4-consumables, 5-extruder motor, 6-feeding gear, 7-heating fins, 8-heating fan, 9-heating block, 10-nozzle, 11-printing substrate, 12-workpiece, 13-puncture needle, 14-temperature sensor, 15-heating rod, 16-puncture needle bracket, 17-puncture needle return spring, 18-cam, 19-puncture needle motor, 20-photoelectric sensor, 21-nozzle mechanism body, 22-cam controller. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is described in detail below in conjunction with the specific drawings.

[0043] See also Figures 1 to 7 , an embodiment of the present invention provides a FDM 3D printer nozzle mechanism with a needle, comprising;

[0044] The nozzle mechanism body 21 is used to install all the parts of the printer nozzle mechanism;

[0045] A feeding assembly, used for feeding the consumables required for the printing process 4;

[0046] The feeding assembly includes a spring 1, a pressure wheel bracket 2, a pressure wheel 3, an extruder motor 5 and a feed gear 6:

[0047] A spring 1, which is mounted on the nozzle mechanism body 21, and the spring 1 provides continuous elastic pressure to the pressing wheel 3 through the pressing wheel bracket 2, so that the consumables 4 can be fed smoothly and effectively;

[0048] A pressure wheel bracket 2 is mounted on the nozzle mechanism body 21. A pressure wheel 3 is mounted on the pressure wheel bracket 2. The pressure wheel 3 cooperates with a feed gear 6 to provide continuous feeding force for the consumable 4 to ensure printing requirements.

[0049] The extruder motor 5 receives the feed signal sent by the host to rotate, drives the feed gear 6, and then delivers the required consumables 4 for the printing process. The consumables 4 are inserted between the feed gear 6 and the pressure wheel 3, and the consumables 4 pass through the feed pipe at the same time;

[0050] A cooling component is used to take away the heat from the feeding pipe, so that the temperature of the feeding pipe is at a low temperature, so that the consumables 4 can smoothly enter the nozzle 10;

[0051] The cooling assembly includes a heat dissipation fin 7 and a heat dissipation fan 8:

[0052] A heat dissipation fin 7, which is arranged on one side of the feed pipe and is used to increase the heat dissipation area;

[0053] The heat dissipation fan 8 is arranged on one side of the heat dissipation fin 7 , and the heat entering the feed pipe is taken away by the heat dissipation fan 8 , so that the temperature of the feed pipe is kept at a low temperature, allowing the consumables 4 to smoothly enter the nozzle 10 .

[0054] A heating component is used to provide heat to the nozzle 10 and ensure that the nozzle temperature is within a certain threshold range, so as to ensure that the consumable 4 melts smoothly and then ensures smooth printing. The consumable 4 is a linear consumable dedicated to the FDM3D printer;

[0055] The heating assembly includes a heating block 9, a temperature sensor 14, a heating rod 15 and a nozzle 10:

[0056] A heating block 9, which provides heat for the nozzle 10, and the bottom end of the feed pipe is inserted into the heating block 9;

[0057] A temperature sensor 14 is used to detect the temperature of the heating block 9 so as to keep the temperature within a certain threshold range;

[0058] The heating rod 15 is used to heat the heating block 9 so that the temperature of the nozzle 10 reaches the melting temperature of the consumable 4 .

[0059] The nozzle 10 is installed at the bottom of the heating block 9 in the heating assembly. The nozzle 10 is the final actuator of the FDM 3D printer. The consumable 4 is melted into liquid, sprayed out according to a certain procedure, and cooled into a certain shape of features, and finally forms a workpiece 12. The workpiece 12 is a design feature finally formed by printing layer by layer through the nozzle 10;

[0060] A printing substrate 11 is a carrier for printing a workpiece 12. The printing substrate 11 sinks one layer each time a layer is printed.

[0061] The needle 13 is a key part of the mechanism. Its function is to pierce the n-1 layer at a certain rhythm when the workpiece 12 prints the n-th layer, bring a part of the n-th layer 12 in a molten state into the n-1 layer, and at the same time bring the material of the n-1 layer into the n-th layer at the moment of the needle 13 retracting, so that a part of the material of the n-th layer is embedded in the n-1 layer under high temperature, and a part of the material of the n-1 layer is embedded in the n-th layer, so that the n-th layer and the n-1 layer have a mutual embedding mechanism, which is equivalent to sewing the n-th layer and the n-1 layer together through the needle 13, so that the connection strength between the n-th layer and the n-1 layer is greatly increased;

[0062] The reciprocating driving assembly is used to drive the needle 13 to perform up and down reciprocating motion.

[0063] The reciprocating push assembly includes a needle support 16, a needle return spring 17, a cam 18, a needle motor 19, a photoelectric sensor 20 and a cam controller 22:

[0064] The needle holder 16 is used to mount the needle 13 and drive the needle 13 to reciprocate. The function of the pin on the needle holder 16 is to keep the needle holder 16 to reciprocate up and down without rotating. At the same time, the function of the positioning arm on the needle holder is to block the sensing slot of the photoelectric sensor 20, so as to detect whether the position of the needle 13 is in the upper position (non-piercing) state;

[0065] The puncture needle return spring 17 is used to give an upward elastic force to the puncture needle support 16 so that the puncture needle support 16 is in an upper position under a non-puncture condition;

[0066] The cam 18 is mounted on the main shaft of the needle motor 19 and is used to convert the rotational motion of the needle motor 19 into the reciprocating motion of the needle 13. The needle motor 19 provides power for the high-speed reciprocating motion of the needle;

[0067] The photoelectric sensor 20 is used to detect the position of the needle holder 16, so as to ensure that the needle 13 is in the upper position when not in operation;

[0068] The cam controller 22 controls the position of the cam 18 by driving the needle motor 19 , thereby controlling the moving position of the needle 13 . The signal of whether the needle 13 is in the upper position is detected by the photoelectric sensor 20 , and the signal is transmitted to the cam controller 22 .

[0069] Working principle: After the 3D printer starts working, the heating rod 15 starts to heat up. After the temperature sensor 14 detects that the temperature reaches the liquefaction temperature of the consumable 4, the printer starts working, and the extrusion motor 5 drives the feed gear 6 to feed the consumable 4 into the nozzle.

[0070] Since the needle 13 does not need to work when the workpiece 12 is printed to the first layer, at this time, the needle 13 is in the upper position and the needle motor does not work.

[0071] When the workpiece 12 starts to print the second layer, the cam controller 22 drives the needle motor 19 to start working, and drives the cam 18 to rotate, thereby driving the needle support 16 and the needle 13 to reciprocate.

[0072] When the needle 13 moves from the upper position to the lower position, the second layer of consumables is being ejected at high temperature and is in a molten state, and the needle 13 is also in a high temperature state. The needle 13 will bring part of the molten consumables of the second layer of the workpiece 12 into the first layer of the workpiece. Since the molten consumables have a certain viscosity, the needle 13 will bring part of the consumables of the first layer into the second layer when it returns from the lower position to the upper position. In this way, the first layer and the second layer will be embedded in each other, just like sewing the first layer and the second layer. By analogy, the first layer and the second layer are sewn together, the second layer and the third layer are sewn together..., and the n-1 layer and the n layer are sewn together. Thereby, the bonding strength of the entire printed workpiece 12 in the Z direction is greatly increased.

[0073] The above-mentioned FDM 3D printer nozzle mechanism with a needle effectively solves the problem of low connection strength and easy cracking in the Z direction of the printed workpiece. It increases the Z-direction strength of the printed workpiece, expands the application range of the printed workpiece, and reduces the design difficulty of 3D printed parts. It lays a technical foundation for the further industrialization and marketization of 3D printers.

[0074] It should be noted that, in this article, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0075] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An FDM 3D printer nozzle mechanism with a needle, characterized in that: include; The nozzle mechanism body is used to install all parts of the printer nozzle mechanism; A feeding assembly, used for delivering the consumables required for the printing process; The cooling component is used to take away the heat from the feeding pipe, so that the temperature of the feeding pipe is at a low temperature, allowing the filament to enter the nozzle smoothly; The heating component is used to provide heat to the nozzle and ensure that the nozzle temperature is within the threshold range, so as to ensure smooth melting of the filament and smooth printing; The nozzle is installed at the bottom of the heating block in the heating assembly, and melts the consumable into liquid and sprays it out according to the program to form a workpiece; The printing substrate is a carrier for printing workpieces. Each time a layer is printed, the printing substrate sinks a layer. The needle, when printing the nth layer of the workpiece, pierces the n-1th layer according to the beat, bringing part of the molten nth layer into the n-1th layer, and at the moment of the needle retracting, brings the material of the n-1th layer into the nth layer, so that part of the material of the nth layer is embedded in the n-1th layer under high temperature, and part of the material of the n-1th layer is embedded in the nth layer, so that the nth layer and the n-1th layer have a mutual embedding mechanism, which is equivalent to sewing the nth layer and the n-1th layer together through the needle, so that the connection strength between the nth layer and the n-1th layer is greatly increased; The reciprocating driving assembly is used to drive the needle to perform up and down reciprocating motion.

2. The FDM 3D printer nozzle mechanism with a needle according to claim 1, characterized in that: The feeding assembly includes a spring, a pressure wheel bracket, a pressure wheel, an extruder motor and a feed gear: A spring, which is mounted on the nozzle mechanism body, and the spring provides continuous elastic pressure to the pressing wheel through the pressing wheel bracket, so that the consumables can be fed smoothly and effectively; The pressure wheel bracket is installed on the main body of the nozzle mechanism. The pressure wheel is installed on the pressure wheel bracket. The pressure wheel cooperates with the feeding gear to provide continuous feeding force for the consumables to ensure printing requirements; The extruder motor receives the feed signal sent by the host to rotate, drive the feed gear, and then deliver the required consumables for the printing process.

3. The FDM 3D printer nozzle mechanism with a needle according to claim 1, characterized in that: The cooling assembly comprises: A heat dissipation fin, which is arranged on one side of the feed pipe and is used to increase the heat dissipation area; The heat dissipation fan is arranged on one side of the heat dissipation fins. The heat dissipation fan takes away the heat from the feed pipe, so that the temperature of the feed pipe is kept at a low temperature, allowing the consumables to enter the nozzle smoothly.

4. The FDM 3D printer nozzle mechanism with a needle according to claim 1, characterized in that: The heating assembly comprises: A heating block, which provides heat for the nozzle, and the bottom end of the feed pipe is inserted into the heating block; a temperature sensor for detecting the temperature of the heating block so as to keep the temperature within a threshold range; The heating rod is used to heat the heating block so that the temperature of the nozzle reaches the melting temperature of the filament.

5. The FDM 3D printer nozzle mechanism with a needle according to claim 1, characterized in that: The reciprocating driving assembly comprises: The needle holder is used to install the needle and drive the needle to reciprocate. The pin on the needle holder is used to keep the needle holder to reciprocate up and down without rotating. At the same time, the positioning arm on the needle holder is used to block the sensing slot of the photoelectric sensor, so as to detect whether the position of the needle is in the upper state. The puncture needle return spring is used to give the puncture needle holder an upward elastic force so that the puncture needle holder is in an upper position under non-puncture conditions; A cam is mounted on the main shaft of the needle motor and is used to convert the rotary motion of the needle motor into the reciprocating motion of the needle. The needle motor provides power for the high-speed reciprocating motion of the needle. Photoelectric sensor, used to detect the position of the needle holder, in order to ensure that the needle is in the upper position when not in operation; The cam controller controls the position of the cam by driving the needle motor, thereby controlling the moving position of the needle. The signal of whether the needle is in the upper position is detected by the photoelectric sensor, and the signal is transmitted to the cam controller.

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