A 3D drawing pen

Abstract

The present invention discloses a 3D drawing pen, wherein the pen body and the nozzle of the 3D drawing pen are fixed by a locking buckle device, the nozzle is a heating nozzle, the heating nozzle is connected to a driving circuit device, the driving circuit device at least comprises a heating wire, a fuse, a wire feeding motor module and a main board, the function key and the material channel are connected to the driving circuit device, and the drawing pen heating method implemented by the driving circuit device controls the temperature inside the nozzle through the driving circuit, realizes reasonable temperature control of the 3D drawing pen, eliminates the complex circuit and high cost of temperature control and heating of the control chip, and can maximize the cost reduction in realizing the basic functions of the 3D drawing pen, while meeting the user's operational requirements and improving the safety during operation.

Description

Technical Field

[0001] The invention relates to a 3D drawing device, in particular to a 3D drawing pen and a heating method thereof. Background Art

[0002] In recent years, 3D drawing pens have attracted more and more attention. The types of 3D drawing pens on the market are also quite complicated. Most of the existing drawing pens use a single-chip temperature control drive to control the heating temperature and the direction of the motor, and control the temperature by installing a temperature detection device, or use a high temperature warning method to achieve the purpose of temperature control, which greatly increases the cost of temperature control. When the temperature reaches a high level, there will be safety hazards, which reduces the service life of the product and is also unsafe for users. At this time, a 3D drawing pen with intelligent temperature control is urgently needed. Summary of the invention

[0003] In order to improve the shortcomings of the current heating process of a 3D drawing pen, the present invention provides a 3D drawing pen and a heating method thereof. The present invention does not adopt a single-chip temperature control device used in conventional technology, but utilizes the characteristic of a PPTC resettable fuse that its resistance rises sharply when the temperature exceeds 85 degrees to block large currents and thereby control the temperature to a stable value, thereby greatly reducing production costs, satisfying the user's operational requirements, and improving safety during operation.

[0004] To solve the above problems, the present invention provides a 3D drawing pen, which includes a pen body and a nozzle, the pen body and the nozzle are fixed by a locking buckle device, the nozzle is a heating nozzle, and the heating nozzle is connected to a driving circuit device.

[0005] As a preferred technical solution, the driving circuit device at least includes a heating wire, a fuse, a wire feeding motor module and a main board.

[0006] As a preferred technical solution, the heating wire is installed on the heating nozzle, the resistance of the heating wire is 6-8 ohms, the fuse adopts a PPTC resettable fuse, the voltage of the PPTC resettable fuse is 5V, the heating wire is used to heat the consumables, the PPTC resettable fuse is installed tightly on the heating wire, the heating wire extends upward to connect the mainboard, the wire feeding motor module is used to drive the consumables to move downward or upward, and is installed inside the pen body.

[0007] As a preferred technical solution, the switch module in the drive circuit uses a single-pole triple-throw switch, and the power supply module in the drive circuit uses a 5V DC power supply.

[0008] As a preferred technical solution, a material channel is also installed in the pen body, and the material channel extends downward from the wire inlet hole on the pen cap to the nozzle part.

[0009] As a preferred technical solution, the function keys include at least a wire feed key and a wire retract key. The wire feed key is used for the motor to control the consumables in the material channel to push downward for painting operations, and the wire retract key is used for the motor to drive the consumables to be pulled upward.

[0010] As a preferred technical solution, the nozzle is externally encapsulated with a nozzle shell, and the pen body includes an upper cover, a lower cover and a tail cover. The upper cover and the lower cover are fixed closed by a locking device, and the nozzle shell and the tail cover are respectively fixed at both ends.

[0011] A heating method for a 3D drawing pen comprises the following steps:

[0012] Step 1: After putting the consumables into the drawing pen through the wire inlet hole, connect the drawing pen to the power supply, the drawing pen enters the power-on standby state, the power indicator light is on, the heating wire starts to heat up, and the drawing pen immediately enters the preheating mode;

[0013] Step 2: When the drawing pen is continuously heated to 85 degrees, the resistance of the PPTC resettable fuse increases rapidly to block the large current, and the temperature remains at a stable value and does not increase any more;

[0014] Step 3: Press the wire feed button, the PPTC resettable fuse is short-circuited, and the heating wire is directly heated. Driven by the motor, the filament is pushed downward through the material channel, heated and melted, and then extruded for painting. New filaments are continuously fed into the heating wire part, and the heating temperature reaches thermal equilibrium;

[0015] Step 4: Press the wire withdrawal button, the PPTC resettable fuse is short-circuited, and the heating wire is directly heated to fully heat the nozzle. After the consumables are fully melted, they are pulled out upwards driven by the motor.

[0016] As a preferred technical solution, the consumables are PCL low-temperature consumables. PCL low-temperature consumables are used. The consumables are preferably PCL consumables. PCL is a non-toxic, low-melting-point thermoplastic consumable that has higher safety due to its low molding temperature.

[0017] As a preferred technical solution, the PPTC resettable fuse is preferably 5V, maintaining a current greater than the current of the heating wire, an operating temperature of -40~85°C, and the function button and the material channel are connected to the drive circuit device.

[0018] As a preferred technical solution, after the consumables are placed into the drawing pen through the wire inlet, the drawing pen is connected to the power supply, the drawing pen enters the power-on standby state, the heating wire begins to heat, and when the heating wire continues to heat to 85 degrees, the fuse resistance increases rapidly to block the large current, and the temperature is maintained at a stable value and no longer increases. The fuse adopts a PPTC self-resetting fuse. The biggest feature of the PPTC self-resetting fuse is that within its rated use range, the PPTC self-resetting fuse does not need to be replaced after each fault is eliminated, and can be repeatedly used in the circuit, effectively saving maintenance time and cost. The PPTC self-resetting fuse is installed on the heating wire. The PPTC self-resetting fuse is close to the heat source. When in standby mode, the temperature of the heating wire increases and the PPTC resistance increases, blocking the large current. At this time, the current value is only enough to maintain a stable temperature, thereby ensuring that the heating wire always maintains a suitable temperature. Press the wire feed key, the PPTC resettable fuse in the drive circuit is short-circuited, and the heating wire is directly used for heating. The consumables are sent to the nozzle through the material channel and heated until they melt. The consumables are pushed out for painting operations, and new consumables are continuously fed into the heating wire part, so that the heating temperature reaches thermal equilibrium. When it is necessary to replace consumables of different colors, press the wire withdrawal key, the PPTC resettable fuse is short-circuited, and the heating wire is directly used for heating, so that the nozzle is fully heated. After the consumables are fully melted, they are pulled out by the motor. When the painting operation is performed again, repeat steps 1 to 4.

[0019] The beneficial effects of the present invention are as follows: the driving circuit heating wire heating method is adopted, and the characteristic of the PPTC self-resettable fuse that the resistance increases sharply when the temperature exceeds 85 degrees is utilized to block the large current and control the temperature to a stable value so that it will not rise again. The 3D drawing pen heating method of the present invention does not require the use of other temperature control devices to achieve the temperature control effect, eliminating the complex circuit and high cost of the control chip temperature control heating, and achieving maximum cost reduction in realizing the basic functions of the 3D drawing pen. At the same time, it also avoids damage to the internal components of the product, effectively saves maintenance time and cost, and extends its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 , Figure 2 This is a schematic diagram of the drawing pen structure.

[0021] In the figure: 1. Nozzle housing 2. Wire feed button 3. Wire retract button 4. Power indicator light 5. Upper cover 6. Tail cover 7. Power jack 8. Wire feed hole 9. Lower cover 10. PPTC resettable fuse 11. Main board 12. Wire feed motor module 13. Material channel 14. Heating nozzle 15. Heating wire.

[0022] Figure 3 This is the circuit diagram of the drawing pen working during preheating.

[0023] Figure 4This is the circuit diagram of the drawing pen working when feeding wire.

[0024] Figure 5 This is the circuit diagram of the drawing pen working when the wire is withdrawn. DETAILED DESCRIPTION

[0025] Example 1: Figure 1 As shown, the 3D drawing pen includes a pen body and a nozzle, the pen body and the nozzle are fixed with a locking buckle device, the nozzle is a heating nozzle 14, and the heating nozzle 14 is connected to a driving circuit device. The driving circuit device at least includes a heating wire, a fuse, a wire feeding motor module and a main board. The fuse adopts a PPTC self-resetting fuse 10, the voltage of the PPTC self-resetting fuse 10 is 5V, the heating wire 15 is used to heat the consumables, the resistance of the heating wire 15 is 6-8 ohms, the PPTC self-resetting fuse is closely installed on the heating wire 15, the wire feeding motor module 12 is used to drive the consumables to move downward or upward, the switch module in the driving circuit uses a single-pole triple-throw switch, and the power supply module in the driving circuit uses a 5V DC power supply. A material channel 13 is also installed in the pen body, and the material channel 13 extends downward from the wire feeding hole on the pen cover to the nozzle part. The function keys at least include a wire feed key 2 and a wire retract key 3, the wire feed key 2 is used for the motor to control the consumables in the material channel to push downward for painting operations, and the wire retract key 3 is used for the motor to drive the consumables to pull upward, the nozzle is externally encapsulated with a nozzle housing 1, the pen body includes an upper cover 5, a lower cover 9 and a tail cover 6, the tail cover 6 is provided with a power jack 7 and a wire feed hole 8, and the surface of the upper cover is fixedly mounted with function keys and a power indicator light 4.

[0026] Step 1: After the consumables are put into the drawing pen through the wire inlet hole 8, the drawing pen is connected to the power supply, the drawing pen enters the power-on standby state, the power indicator light 4 lights up, the heating wire 15 starts to preheat, and the drawing pen immediately enters the preheating mode;

[0027] Step 2: When the drawing pen is continuously heated to 85 degrees, the resistance of the PPTC resettable fuse 10 increases rapidly to block the large current, and the temperature remains at a stable value and does not increase any more;

[0028] Step 3: Press the wire feed key 2, the PPTC resettable fuse 10 is short-circuited, and the heating wire 15 is directly heated. Driven by the wire feed motor module 12, the consumable material is pushed downward through the material channel 13, and is heated and melted and then extruded for painting. New consumable material is continuously fed into the heating wire 15, and the heating temperature reaches thermal equilibrium;

[0029] Step 4: Press the wire withdrawal button, the PPTC resettable fuse 10 is short-circuited, and is directly heated by the heating wire 15, so that the nozzle is fully heated. After the consumables are fully melted, they are pulled out upwards driven by the motor.

[0030] The consumables are PCL low-temperature consumables. PCL low-temperature consumables are used. The consumables are preferably PCL consumables. PCL is a non-toxic, low-melting-point thermoplastic consumable that has higher safety due to its low molding temperature.

[0031] The PPTC resettable fuse 10 is preferably 5V, maintaining a current greater than the current of the heating wire, and an operating temperature of -40~85°C. The function button and the material channel 13 are connected to the drive circuit device.

[0032] The circuit principle of the 3D drawing pen of the present invention during operation is as follows:

[0033] 1. According to Figure 2 As shown, when the power is on and in standby mode, the heating wire 102 is first heated to 85 degrees, the resistance of the PPTC resettable fuse 105 rises sharply, the current becomes about 0.1A, and the temperature is maintained.

[0034] 2. According to Figure 3 As shown, when feeding the wire, the single-pole three-throw switch 101 is pressed to one side, at which time the PPTC resettable fuse 105 is short-circuited, the consumable is directly heated by the heating wire 102, the motor 100 rotates forward, and new consumable is continuously fed into the heating wire 102 part, so that the heating temperature reaches thermal equilibrium and will not rise indefinitely.

[0035] 3. According to Figure 4 As shown, when withdrawing the wire, the single-pole three-throw switch 101 is pressed toward the other side, at which time the PPTC resettable fuse 105 is short-circuited, the consumable is directly heated by the heating wire 102, and the motor 100 reverses to drive the consumable to withdraw from the drawing pen.

[0036] The above embodiments do not limit the present invention. The structure of the present invention can be flexibly arranged as needed. Various changes and modifications made by relevant personnel without departing from the technical idea of ​​the present invention all fall within the protection scope of the present invention.

Claims

1. A 3D drawing pen, characterized in that: The 3D drawing pen includes a pen body and a nozzle, the pen body and the nozzle are fixed by a locking buckle device, the nozzle is a heating nozzle, the heating nozzle is connected to a driving circuit device, the driving circuit device at least includes a heating wire, a fuse, a wire feeding motor module and a main board, the heating wire is installed on the heating nozzle, the resistance of the heating wire is 6-8 ohms, the fuse adopts a PPTC self-resettable fuse, the voltage of the PPTC self-resettable fuse is 5V, the PPTC self-resettable fuse is closely attached to the heating wire, and the feeding The wire motor module is used to drive the consumables to move downward or upward. A material channel is also installed in the pen body, and the material channel extends downward from the wire inlet hole on the pen cover to the nozzle part. The nozzle is encapsulated with a nozzle shell on the outside. The pen body includes an upper cover, a lower cover and a tail end cover. The upper cover and the lower cover are fixed closed with a locking device, and the nozzle shell and the tail end cover are fixed at both ends respectively. The tail end cover is provided with a power jack and a wire inlet hole. Function buttons and a power indicator light are fixedly installed on the surface of the upper cover, and the function buttons include at least a wire feed key and a wire retract key.

2. The 3D drawing pen heating method according to claim 1, characterized in that: The method comprises the following steps: Step 1: after the consumables are put into the drawing pen through the wire inlet hole, the drawing pen is connected to a power source, the drawing pen enters a power-on standby state, the power indicator light is on, the heating wire starts to heat, and the drawing pen immediately enters a preheating mode; Step 2: When the drawing pen is continuously heated to 85 degrees, the resistance of the PPTC resettable fuse increases rapidly to block the large current, and the temperature remains at a stable value and does not increase any more; Step 3: Press the wire feed button, the PPTC resettable fuse is short-circuited, and the heating wire is directly heated. The wire feed motor module drives the filament to move downward through the material channel, and after heating and melting, it is extruded for painting. New filaments are continuously fed into the heating wire part, and the heating temperature reaches thermal equilibrium; Step 4: Press the wire withdrawal button, the PPTC resettable fuse is short-circuited, and the heating wire is directly heated to fully heat the nozzle. After the consumables are fully melted, they are pulled out upwards driven by the motor.

3. The 3D drawing pen heating method according to claim 2, characterized in that: The consumables are PCL low-temperature consumables.

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