Medical PEEK prosthesis 3D printer

Abstract

The utility model relates to a medical PEEK prosthesis 3D printer which comprises a printing box body, a cooling box body and a control box body, the cooling box body and the control box body are arranged below the printing box body, a constant-temperature heat circulation system and a printing mechanism are arranged in the printing box body, and the constant-temperature heat circulation system comprises a heater, a fan and a temperature sensor. The printing mechanism comprises double extrusion heads and a driving unit, cooling assemblies and thermocouples are arranged on the double extrusion heads, the driving unit controls the double extrusion heads to move, a printing platform is arranged on the lower portion of the printing box body, and a hot bed is arranged below the printing platform; according to the printer, the constant-temperature heat circulation system and the heat insulation structure are arranged in the printing box body, the cooling assembly is arranged to control the temperature in the printing box body to be stable, and the running safety and stability of the printer are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printer technical field, specifically say a kind of medical PEEK prosthesis 3D printer. BACKGROUND

[0002] 3D printer (3D Printers), also called three-dimensional printer, is a kind of process equipment of rapid prototyping;It is a kind of technology that uses digital model file as foundation, uses powder-like metal or plastic and other adhesion materials, and constructs object by layer printing. 3D printing is usually realized by digital technology material printer.

[0003] At present, craniomaxillofacial filling prosthesis is mostly manually carved by doctors, and after completion, operation is carried out, the cost is higher, and time is wasted, and manual carving exists the conditions of poor precision and low efficiency;Therefore, how to overcome the above-mentioned technical problems and defects becomes the problem that needs to be solved. SUMMARY

[0004] The utility model aims at overcoming the defects described in the background art, to realize a kind of medical PEEK prosthesis 3D printer, constant temperature thermal cycle system and heat insulation structure are arranged in the printing box, cooling assembly is equipped to control the temperature stability in the printing box, ensure the safety and stability of the printer operation.

[0005] To realize the above-mentioned utility model purposes, the technical scheme of the utility model is as follows: a kind of medical PEEK prosthesis 3D printer, including printing box and the cooling box and control box being arranged below it, constant temperature thermal cycle system and printing mechanism are arranged in the printing box, the constant temperature thermal cycle system includes heater, fan and temperature sensor, the printing mechanism includes double extrusion head and drive unit, cooling assembly and thermocouple are arranged on the double extrusion head, drive unit controls the movement of double extrusion head, printing platform is arranged in the lower part of the printing box, and hot bed is arranged below the printing platform.

[0006] Further, the heater is a heating plate, which is uniformly arranged on the two side walls in the printing box, and the two sides of the heater are respectively provided with air inlet and air outlet.

[0007] Further, the drive unit includes linear motor, stepper motor, ball screw and linear guide rail, the linear guide rail and the ball screw are arranged in parallel, the ball screw is driven by the stepper motor, and the double extrusion head is installed on the ball screw and the linear guide rail by the linear motor.

[0008] Further, heat insulation structure is arranged on the inner side wall of the printing box, and the box door is installed on the front side of the printing box, and three layers of vacuum glass are installed on the box door.

[0009] Further, the cooling assembly comprises a liquid cooling system and an air pump cooling system.

[0010] Further, the control box is internally provided with a main control board and a memory, and an operation screen is installed on the outside of the control box.

[0011] Further, an optical sensor is installed on the feeding pipe of the double extrusion head, and a non-contact sensor is installed in the printing box.

[0012] The medical PEEK prosthesis 3D printer has the advantages that:

[0013] The medical PEEK prosthesis 3D printer has the advantages that: the heat insulation material on the inner wall of the printing box and the constant temperature heat circulation system ensure the safety and stability of the equipment in a high temperature environment, the fan accelerates the circulation of hot air in the box, ensures the uniform distribution of the internal temperature of the cavity, ensures the constant temperature of the internal temperature of the cavity in the printing process, avoids the problems of deformation and warping of the printed parts caused by temperature fluctuation, and thus ensures that the printed parts of high performance materials such as PEEK have good mechanical properties and surface quality, the double extrusion head printer design can use two materials (such as PEEK and support material) at the same time, or print through one nozzle and standby through the other nozzle, improve the efficiency of printing, and the hot bed is used for heating the printing platform to prevent the PEEK material from warping or cracking due to rapid cooling in the printing process. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic view of the medical PEEK prosthesis 3D printer of the utility model;

[0015] Figure 2 is Figure 1 a three-dimensional schematic view;

[0016] In the figure: 1-printing box, 2-cooling box, 3-control box, 4-operation screen, 5-linear guide rail, 6-stepping motor, 7-double extrusion head, 8-printing platform, 9-hot bed, 10-constant temperature heat circulation system, 11-box door. DETAILED DESCRIPTION

[0017] The medical PEEK prosthesis 3D printer of the utility model will be described in more detail below in combination with the drawings and through specific embodiments.

[0018] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0019] Referring to Figures 1-2 The utility model discloses a kind of medical PEEK prosthesis 3D printers of the embodiment, the printer is provided with thermostatic heat cycle system and heat insulation structure in printing box body, equipped with cooling assembly to control the temperature stability in printing box body, ensure the safety and stability of printer operation, it mainly includes printing box body 1 and the cooling box body 2 and control box body 3 being arranged below it.

[0020] Box door is installed on the front side of printing box body, three layers of vacuum glass are installed on the box door, heat insulation structure is provided on the inner wall of printing box body 1, heat insulation structure is made of three layers of aviation-grade heat insulation material, good heat insulation effect is played, so that the temperature of the front door, top door, screen area, fuselage and side panel area of machine can be controlled within 40 ° when equipment cavity temperature reaches 180 °, main control board and memory are provided in control box body 3, for controlling and storing the work and signal of printer, operation screen 4 and alarm are installed on the outside of control box body 3, show the status and process of printer.

[0021] Constant temperature heat cycle system 10 and printing mechanism are provided in the printing box body 1, the constant temperature heat cycle system 10 includes heater, fan and temperature sensor, the heater is heating plate, heating plate is evenly arranged in the two side walls in printing box body, air inlet and air outlet are respectively provided on the two sides of heater, ensure the circulation of air, promote the circulation of hot air by fan, rapidly promote the temperature in box body, and ensure the uniform distribution of temperature in box body, temperature sensor is used to monitor the temperature in box body in real time, and temperature information is fed back to control system.

[0022] The printing mechanism includes a double extrusion head 7 and a driving unit, an optical sensor is installed on the feeding tube of the double extrusion head 7, which judges whether there is material by detecting whether the material blocks the light, ensures the continuity of printing, a non-contact sensor is installed in the printing box to detect the height and levelness of the printing platform, the driving unit includes a linear motor, a stepping motor 6, a ball screw and a linear guide rail 5, the linear guide rail 5 and the ball screw are arranged in parallel, the ball screw is driven by the stepping motor 6, the double extrusion head 7 is installed on the ball screw and the linear guide rail 5 through the linear motor, a cooling assembly and a thermocouple are arranged on the double extrusion head 7, the thermocouple monitors the temperature of the extrusion head in real time, the cooling assembly includes a liquid cooling system and an air pump cooling system to prevent the extrusion head from overheating, a printing platform is arranged at the lower part of the printing box, a hot bed is arranged below the printing platform, which is used to heat the printing platform to prevent the PEEK material from warping or cracking due to rapid cooling during printing.

[0023] Before printing starts, the printer can automatically detect the levelness of the printing platform and adjust the height of the print head, which detects the height of the printing platform through a non-contact sensor (such as an infrared sensor), the sensor measures at multiple points (usually 3-9 points) on the printing platform, the main control board generates a height distribution map of the printing platform according to the sensor data, calculates the compensation value of the print head through an algorithm, ensures the consistency of the distance between the print head and the platform, and the main control board controls the linear motor to adjust the height of the print head according to the compensation value, ensuring uniform printing of the first layer.

[0024] During printing, the printing material is transported by the feeding tube, an optical sensor is installed at the feeding tube, which judges whether there is material by detecting whether the material blocks the light, the sensor sends the detection signal to the main control board, if a material break is detected, the main control board pauses the printing and issues an alarm (such as a buzzer or screen prompt), after the user replaces the material, the printer can continue printing from the pause point, maintaining the continuity of printing and ensuring the quality of printing; if a power failure occurs, the main control board (ARM or STM32 series) of the printer will save the printing progress (such as layer height, print head position, printing speed, etc.) to a non-volatile memory (SD card or EEPROM) in real time, after the power is restored, the main control board reads the printing state before the power failure from the memory and reinitializes the printer (such as heating the extrusion head and the hot bed), the print head moves to the position before the power failure, and continues to complete the remaining printing task.

[0025] The temperature sensor monitors the temperature inside the printing box in real time, when the temperature reaches the set value, the control system will reduce the power of the heater or pause heating, while adjusting the speed of the fan to maintain the stability of the temperature, if the temperature is lower than the set value, the control system will increase the power of the heater to continue heating.

[0026] The extrusion head is used for melting PEEK material (melting point about 343℃) and precisely extruding in the printing process, the extrusion head is equipped with a thermocouple for monitoring the temperature in real time, the control system adjusts the heating power according to the set value (usually 380℃-480℃) to ensure the temperature stability, when the extrusion head operates at high temperature, a cooling system is needed to prevent overheating, especially the components near the nozzle, the liquid cooling system internally cools the extrusion head by circulating cooling liquid (special coolant), and the air pump cooling system externally cools the extrusion head by fans or compressed air to control the temperature of the extrusion head.

[0027] After the printing is completed, the printer can automatically turn off the power supply, save energy and improve safety, the main control board detects whether the printing task is completed through the G code parser, after the printing is completed, the main control board starts the delay closing program (waits for the heat bed and the extrusion head to cool to a safe temperature), the main control board controls the on-off of the power supply through a relay or a MOS tube, and after the delay ends, the main control board sends a signal to cut off the power supply.

[0028] Unless otherwise defined, technical terms or scientific terms used herein should be understood as having the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. "Including" or "comprising" and similar words mean that the elements or objects listed before the word encompass the elements or objects listed after the word and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, whether direct or indirect.

[0029] The exemplary embodiments of the present application are described in detail above with reference to the preferred embodiments, however, it can be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present application, and various combinations of the technical features and structures proposed in the present application can be made without exceeding the protection scope of the present application.

Claims

1. A medical PEEK prosthesis 3D printer, comprising a printing chamber and a cooling chamber and a control chamber disposed below it, characterized in that: The printing chamber is equipped with a constant temperature thermal circulation system and a printing mechanism. The constant temperature thermal circulation system includes a heater, a fan and a temperature sensor. The printing mechanism includes a dual extruder head and a drive unit. The dual extruder head is equipped with a cooling component and a thermocouple. The drive unit controls the movement of the dual extruder head. A printing platform is provided at the bottom of the printing chamber, and a heated bed is provided below the printing platform.

2. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: The heater is a heating plate, which is evenly arranged on both sides of the printing chamber. An air inlet and an air outlet are respectively provided on both sides of the heater.

3. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: The drive unit includes a linear motor, a stepper motor, a ball screw, and a linear guide rail. The linear guide rail and the ball screw are arranged in parallel. The ball screw is driven by the stepper motor. The dual extrusion heads are mounted on the ball screw and the linear guide rail via the linear motor.

4. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: The inner wall of the printing chamber is equipped with a heat insulation structure, and a door is installed on the front side of the printing chamber, with three layers of vacuum glass installed on the door.

5. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: The cooling components include a liquid cooling system and an air pump cooling system.

6. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: The control box contains a main control board and a memory, and an operation screen is installed on the outside of the control box.

7. The medical PEEK prosthesis 3D printer according to claim 1, characterized in that: An optical sensor is installed on the feed tube of the dual extruder, and a non-contact sensor is installed inside the printing chamber.

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