816results about How to "Improve printing quality" patented technology

The invention discloses an image-text printing quality analysis system based on machine vision, and relates to the technical field of printing quality analys.The image-text printing quality analysis system comprises the steps that a printed product is scanned, a preliminary scanning image is obtained, the preliminary scanning image is processed, a finished product scanning image is obtained, and the finished product scanning image and a preset standard printing file are registered and partitioned; the finished product scanning image is compared with a standard printing file, a comparison result is obtained, a printing problem generation reason is analyzed according to the comparison result, and a printing reason analysis result file is output. Printing products are accurately detected, character missing, redundancy and image area chromatic aberration are recognized, the states of different inks are analyzed and judged through a CMYK channel, and the printing quality is improved. And according to data such as temperature and ink fitness, a problem reason is judged, an analysis report is finally output, and a user is helped to accurately position the problem and optimize the printing quality.

The invention relates to the technical field of digital printing machines, in particular to an intelligent ink droplet control method and system of a digital printing machine and the digital printing machine. The method comprises the steps of real-time data acquisition, multi-dimensional parameter modeling, real-time ink droplet behavior prediction, self-adaptive ink jet parameter adjustment, closed-loop feedback control, medium characteristic self-adaptive matching, intelligent multi-region optimization and environmental factor compensation. Ink droplet behaviors and environmental data are collected in real time through a high-speed camera and various sensors, a nonlinear model is constructed by using a deep learning technology, and a dynamic parameter optimization curve is generated. According to the method, the printing quality and efficiency are remarkably improved, and the method is suitable for various media and complex scenes.

The invention discloses a method and equipment for pre-printing calibration of different spray heads and a storage medium. The method comprises the following steps: S1, obtaining a printer spray head distance and a color register calibration pattern; s2, setting resolutions matched with different nozzles in the calibration pattern; s3, the calibration pattern is imported into a printer, and the calibration pattern is printed; s4, performing visual identification on the printed calibration pattern, and respectively identifying a frame and a color block of the calibration pattern; s5, after the recognition result is obtained, the nozzle is calibrated through coarse adjustment scales on the right side and the lower portion of the calibration pattern; s6, after calibration, the calibration pattern is printed again; s7, the step S3 is repeated until the color blocks of the calibration pattern are completely overlapped in the square frame, the problems that in the prior art, the calibration difficulty is large, and lines and color spraying cannot be calibrated at the same time are solved, through the specific calibration pattern and visual recognition equipment, the nozzle distance and the color register condition can be accurately analyzed, the accurate offset can be obtained, and the purpose of fine calibration is achieved.

The invention provides a flow monitoring method and device for a 3D printing extruder, and relates to the technical field of additive manufacturing, and the method comprises the steps that material flow data are collected in real time through a multi-dimensional sensor array installed in the 3D printing extruder; transmitting the collected real-time flow data to a control system, and judging whether the material flow is within a preset range or not; according to the deviation between the flow data monitored in real time and the target flow, working parameters of the extruder are automatically adjusted, and adjustment is conducted through a closed-loop feedback control system till the flow is stable; and in the extrusion process, if flow data monitored in real time exceeds a normal working range, an abnormal alarm is triggered, and a corresponding fault processing program is started. The material flow can be accurately monitored in real time, and the working parameters of the extruder can be automatically adjusted according to the monitoring result, so that the stable supply of the material and the quality of the printing process are ensured.

The present application provides a 3D printing method, device, 3D printer and computer equipment, wherein the method includes: obtaining a collection of slice images corresponding to a three-dimensional model to be printed; determining the cross-sectional information of the cross-section in each layer of slice images in the collection of slice images, and based on the cross-sectional information, calculating the printing difficulty value corresponding to each layer of slice images in the collection of slice images; based on the printing difficulty value, respectively determining the printing parameters corresponding to each layer of slice images, and determining the printing operation based on the printing parameters, so as to print the three-dimensional model based on the printing operation. In an embodiment of the present application, during the printing process, the printing parameters can be adaptively adjusted as the printing difficulty value of the slice images changes, thereby improving the printing success rate and printing quality, and at the same time improving the printing efficiency.

The invention discloses an automatic control method for tipping paper printing based on image detection, and relates to the technical field of tipping paper printing, and the method specifically comprises the following steps: obtaining surface feature information of each sub-region in a wrinkling region in a tipping paper printing process in real time, and analyzing the surface feature information after obtaining, respectively generating a light intensity anomaly index and a tension instability index of each sub-region; and constructing a wrinkling influence evaluation model for the light intensity anomaly index and the tension instability index of each generated sub-region, respectively generating a comprehensive evaluation coefficient of each sub-region, performing analysis after generation, and evaluating the influence degree of each sub-region in the wrinkling region on the generated printing alignment parameter. And dividing each sub-region in the wrinkling region into a non-influence region, a low-influence region and a high-influence region according to an evaluation result. According to the invention, the problem of insufficient characteristic identification and evaluation of the wrinkling area is solved, and intelligent improvement of printing alignment precision and finished product quality is realized.

The invention relates to the technical field of 3D printing, and discloses a printing method, device and equipment for a polypropylene workpiece and a storage medium. The method comprises the steps of obtaining initial printing parameters, performing noise reduction and feature extraction to obtain a preprocessed data set, establishing a mapping relation between a physical space and a virtual space through spatial feature vector extraction, and generating an association database of printing environment parameters and material features; performing parameter mapping by adopting a multi-layer neural network, and performing optimization in combination with the crystallization dynamic characteristics of the material to obtain a parameter control strategy; carrying out interlayer distance and path planning on the parameter control strategy to generate a layered printing track; based on the heterogeneous crystallization characteristic of the material, flow and crystallization coupling analysis is conducted on the layered printing track, and a filling printing scheme is obtained through area density calculation; and the filling printing scheme is converted into an equipment instruction, printing is executed, and a target workpiece is finally obtained through real-time monitoring and correction. The printing quality and precision of the polypropylene workpiece are improved.

The invention provides an AI-driven photocuring 3D printing fault prediction method, and relates to the technical field of 3D printing, and the method comprises the steps: collecting printing parameters in real time based on a sensor installed on photocuring 3D printing equipment, and carrying out data preprocessing; multi-dimensional features of photocuring 3D printing are extracted, time sequence features and spatial features are analyzed, and high-dimensional feature vectors of photocuring 3D printing are obtained; marking the collected historical printing data as a normal data sample and a fault data sample, and training and optimizing the constructed fault prediction model in combination with the high-dimensional feature vector; printing parameters collected in real time are detected based on the trained fault prediction model, an obtained prediction result is compared with a preset early warning threshold value, and if the prediction result exceeds the threshold value, early warning is given out according to a fault grading result. By monitoring and analyzing key parameters in the printing process in real time, potential faults are predicted, automatic adjustment is carried out when abnormity occurs, and the reliability of the printing process and the product quality are improved.

The invention relates to the technical field of water-based ink, in particular to bio-based polyurethane water-based ink and a preparation process thereof. The preparation method specifically comprises the following steps: S1, adopting ring-opening epoxidized soybean oil and modified epoxidized soybean oil as chain extenders, and carrying out chain extension reaction on the chain extenders and a polyurethane prepolymer to prepare waterborne polyurethane; s2, performing viscosity reduction treatment on starch, then grafting with 3-amino-5 carboxyl-N-methyl benzamide, and finally mixing with ring-opening epoxidized soybean oil for modification to prepare modified starch; s3, mixing the waterborne polyurethane, the modified starch, the waterborne pigment, the thickening agent, the flatting agent, the defoaming agent and the deionized water according to the proportion, emulsifying and defoaming to obtain the bio-based polyurethane waterborne ink. The bio-based polyurethane water-based ink has excellent thermal stability, adhesive capacity and printing quality, is green and environment-friendly, and shows remarkable practicability.

The invention relates to the technical field of 3D printing control, in particular to a 3D printing control method and system. The method comprises the following steps that a piezoelectric ceramic actuator is used for conducting pulse plastic melting state collection on a 3D printing nozzle, and plastic melt pulse monitoring data are generated; carrying out damping coefficient fitting on the plastic melt pulse monitoring data, and carrying out PID control instruction parameter dynamic adjustment to obtain a plastic melt flow extrusion control strategy; obtaining a target 3D printing model; and intelligent 3D printing control optimization is conducted on the target 3D printing model through a plastic melting flow extrusion control strategy, and an intelligent 3D printing control strategy is obtained. The micro sensor is integrated in the printing nozzle to collect melt flow data in real time, and printing parameters are dynamically adjusted, so that the flow behavior of the high-viscosity plastic melt is accurately controlled, and the surface quality and the size precision of a 3D printing piece are effectively improved.

The invention provides a photocuring 3D printing intelligent slicing optimization method based on artificial intelligence, and relates to the technical field of photocuring 3D printing.The method comprises the steps that a target model summary file is generated by collecting a 3D printing model file and printing parameter data; performing slicing processing on model data in the target model summary file to generate model slicing data; analyzing the geometric complexity of the model by using a deep convolutional neural network, and dynamically adjusting the thickness of a slice layer based on a complexity coefficient; through multi-objective optimization of printing quality, time and material consumption, printing setting is dynamically adjusted according to an optimization result; and the printing state is monitored in real time, slice parameters are adjusted according to monitoring data, an optimization result is verified before actual printing, and slices are adjusted and optimized according to a verification result. The 3D printing model file and the printing parameter data input by the user can be automatically analyzed, the printing process is monitored in real time, the slicing parameters are dynamically adjusted, and the printing quality and efficiency are improved.

The utility model relates to a secondary ink cartridge assembly for a printer, which comprises a secondary ink cartridge body, the secondary ink cartridge body comprises an ink cartridge body and an ink cartridge cover which are mutually sealed and covered, a high-pressure ink cavity, a low-pressure ink cavity and a normal-pressure ink cavity are arranged in the ink cartridge body, and the high-pressure ink cavity, the low-pressure ink cavity and the normal-pressure ink cavity are respectively provided with a liquid level sensor. The high-pressure ink cavity is sequentially communicated with the printing spray head, the low-pressure ink cavity, the normal-pressure ink cavity, the second ink pump, the bubble removing device and the first ink pump, so that ink flows out of the high-pressure ink cavity, sequentially flows through the printing spray head, the low-pressure ink cavity, the second ink pump, the normal-pressure ink cavity, the first ink pump and the bubble removing device and then flows back into the high-pressure ink cavity, and therefore a self-circulation ink path is formed. According to the secondary ink box, ink between the secondary ink box body and the printing spray head keeps continuous circulating flow, precipitation is avoided, the temperature of the ink entering the printing spray head is appropriate and constant, the bubble content is small, the pressure fluctuation is small, and therefore the printing quality is higher, and the printing effect is better.

The present invention discloses a paper conveying device and a printing press to solve the technical problem that the existing printing roller is not conducive to inkjet printing. The present invention includes a sprocket, a chain, a narrow flat plate, and a paper conveying chain row. The chain is arranged as two parallel chains, each chain is connected in an annular manner, the sprocket is arranged in two groups, the sprocket and the chain are meshed and the chain is tensioned into an ellipse, the chain includes an extended chain pin, the paper conveying chain row is provided with a paper biting assembly, the narrow flat plate and the paper conveying chain row are fixedly connected by the extended chain pin and the chain, a plurality of narrow flat plates are arranged in parallel, the paper conveying chain row and its adjacent plurality of narrow flat plates constitute a printing mechanism, a plurality of printing mechanisms are arranged along the chain, and in the upper straight line section of the chain ellipse, the paper conveying chain row and the adjacent plurality of narrow flat plates are spliced ​​to form a large plane facing upward, which can be used as a working plane for inkjet printing. The beneficial technical effects of the present invention are: fast transmission speed, high precision, conducive to inkjet printing and combined use with conventional printing presses.

The invention provides a measurement and jet printing integrated device and method for a complex curved surface, and belongs to the field of advanced manufacturing, and the device comprises a motion module, a jet printing and measurement module, an integrated control module, a voltage control module and an air pressure control module. And the motion module can move independently, so that the functions of measuring and jet printing function switching and jet printing height adjustment according to the measured height are realized. The jet printing and measuring module is used for achieving the functions of pattern jet printing and jet printing height detection in the technological process. According to the method, the mode that the actual height of the jet printing needle and the surface of the workpiece is measured multiple times in the jet printing process and the height of the spray head is adjusted is adopted, the height change of the spray head in the complex curved surface jet printing process is reduced, the defects caused by inaccurate digital analog in the complex curved surface jet printing machining process are reduced, and the production efficiency is improved. The problems that in a complex curved surface application scene, the jet printing height of an existing jet printing method cannot be changed according to the curved surface height, so that the jet printing quality is low, and defects are serious are solved, and the jet printing quality is improved.

The invention relates to a PDF printing method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the steps that content information of a PDF file to be printed is read, and page information of the PDF file is determined; printing parameters of target printing equipment are obtained; determining arrangement information according to the page information and the printing parameters; according to the arrangement information, the content information is arranged, and a printing page is generated; rendering according to the printing page to generate a target image for printing; and sending the target image to the target printing equipment for printing. According to the mode, the printing page is generated and the target image is rendered, so that the PDF file is ensured to be correctly displayed on the target printing equipment; various printing devices and printing parameters can be intelligently adapted, and the printing efficiency and the printing quality are improved.

The invention discloses a full-automatic transparent bottle curved surface printing detection control system, and relates to the technical field of automatic control, and the main scheme is as follows: obtaining a transparent bottle curved surface printing image through an image acquisition module; the intelligent image processing module is used for accurately analyzing the acquired image, so that the detection speed is increased; image information of the image acquisition module and the intelligent image processing module is transmitted to the central control module for comprehensive processing, and a parameter control instruction C and a fault control instruction H are sent out according to a processing result, so that the stability of the system is ensured; the feedback adjusting module adjusts the detection equipment according to the parameter control instruction C and the fault control instruction H, so that the detection efficiency is improved; the evaluation module judges whether the printing effect is qualified or not according to the comprehensive evaluation value M and the comprehensive evaluation threshold value Ma and reflects the actual condition of the printing effect; the early warning module gives out early warning when the printing qualified rate U is lower than the printing qualified rate threshold value Uc.

The invention relates to the field of printing ink, and discloses UV fission printing ink for outer packaging of cigarette cases and a preparation method of the UV fission printing ink. The UV fission ink is prepared from the following raw materials in percentage by weight: 32 to 50 percent of polyurethane acrylate, 30 to 40 percent of functional monomer, 6 to 10 percent of active amine, 4 to 8 percent of photoinitiator, 6 to 8 percent of fission regulator, 2 to 4 percent of polyethylene wax, 0.5 to 1 percent of defoaming agent and 1.5 to 3 percent of flatting agent. The fission regulator is prepared from fumed silica, polydipentaerythritol hexaacrylate, a silane coupling agent and a dispersing agent. The UV fission ink prepared in the invention keeps good fluidity, irregular wrinkle structures or pattern edges formed by printing are not easy to deform, the UV fission ink has good stereoscopic impression and clear lines, and the wrinkle structures or pattern edges are not easy to discolor and fall off.

The invention discloses a screening method for 3D printing powder. The screening method comprises the following steps that powder needing to be screened is prepared; s2, performing screening modes of different levels according to the powder attribute information of the powder: primary screening of the powder; powder is subjected to multi-stage screening; screening fine powder; the screening process is monitored, an alarm detection mechanism is installed, and whether blockage occurs in the screening process or not is judged according to the screening result; different grades of screening modes are carried out by detecting powder attribute information of powder, the alarm mechanism is arranged, whether blockage occurs in the screening process or not is judged according to the screening result, the alarm detection mechanism can be based on the weight of falling materials, when the weight of discharged materials reaches a certain pressure value, it is indicated that work is normal, and the working efficiency is improved. And if the pressure is lower than a normal numerical value, the blanking amount is small, blockage is caused, the blockage and accumulation phenomena of particle materials on the screen are effectively prevented, the continuity and the stability of the screening process are ensured, and the printing quality and the printing consistency are improved.

The utility model relates to a trough with a film stretching device and a DLP (Digital Light Processing) resin printer, which comprise a trough frame and a release film, and are characterized in that the release film is stretched on one end surface of the trough frame, the release film is pressed on the trough frame through a film fixing frame, the periphery of one end of the trough frame close to the release film is fixedly provided with a stretching strip, and the stretching strip is fixed on the other end surface of the trough frame close to the release film. A tensioning strip pressing plate is fixed to the lower end face of the tensioning strip, and the tensioning strip pressing plate is pressed on the release film. According to the DLP resin printer, the trough of the printer is provided with the film tightening device, so that the release film can be conveniently mounted, tightened and replaced, the consistency of film replacement can be ensured, the printing precision and the printing quality are improved, and the use convenience of the resin printer is improved.

The invention provides a tension adjusting method for silk-screen printing, which belongs to the technical field of tension adjustment and comprises the following steps: step 1, acquiring relevant parameters in a silk-screen printing process, and determining influence factors of tension in the silk-screen printing process; 2, the type and the structure of the printing machine are obtained, and a corresponding tension measuring instrument is determined according to the type and the structure; 3, the stretching state and position change of the silk screen are monitored in real time according to a tension measuring instrument, and abnormal tension is determined based on influence factors according to the stretching state and position change; and 4, abnormal parameters of the printing machine are determined according to the abnormal tension, and the tension of silk-screen printing is adjusted based on the printing task of the printed product and the ink type. The problems that due to the fact that obvious stretching and compression occur in the printing process of a silk-screen printing product, tension is not uniform, and meanwhile according to a traditional tension adjusting method, tension adjusting needs to be conducted frequently and printing conditions meeting a printing task need to be reset, and the image quality and precision of silk-screen printing are reduced are solved.

The invention provides a movable chip seat assembly and a developing cartridge, in the movable chip seat assembly, a body is provided with a first chute along a first direction; the cover body is provided with a second sliding groove in the first direction and provided with a first inclined wall and a second inclined wall in the second direction. A first movable column and a second movable column are arranged on the two side faces of the mounting frame respectively, one end of the elastic piece in the first direction is connected with the mounting frame, and the other end of the elastic piece is connected with the cover body. In the mounting process of the developing box, the first movable column and the second movable column slide in the first sliding groove and the second sliding groove in the first direction respectively; and in the taking process of the developing box, the two sides of the mounting base body rotate into the first inclined wall and the second inclined wall by taking the first movable column and the second movable column as centers respectively, and slide in the first inclined wall and the second inclined wall in the second direction. The movable chip seat assembly provided by the invention is ingenious in structural arrangement, so that the developing box is smoothly loaded and unloaded, the chip is stably contacted with a printer contact pin, and the printing use of the developing box is ensured.

The invention relates to the technical field of three-dimensional scanning, in particular to a 3D printing product personalized design method based on a three-dimensional scanning human body model. The method comprises the following steps: acquiring human body three-dimensional scanning data and human body composition data; performing movable joint analysis on the human body three-dimensional scanning data to generate human body movable joint data; performing distributed three-dimensional model modeling on the human body three-dimensional scanning data based on the human body movable joint data to generate a human body three-dimensional model; initial human body fitting product design is conducted on the human body three-dimensional model based on the 3D printing technology, and initial 3D printing product parameter data are obtained; according to the method, by combining the human joints, the body composition data and the user feedback, the fitness and the personalized design precision of the 3D printing product are optimized, and the precision and the flexibility of the personalized design of the 3D printing product are improved.

The invention relates to the technical field of data transmission, in particular to an ink-jet printing data transmission system based on a TSN and an ink-jet printing system.The ink-jet printing data transmission system comprises a time-sensitive network switch used for receiving flow data frames sent by an upper computer; the time-sensitive network gateway is used for receiving the traffic data frame transmitted by the time-sensitive network switch, determining a transmission sequence of all traffic data in a preset transmission time window, and transmitting all processed traffic data; wherein the time-sensitive network gateway mathematical model is constructed based on the flow distribution balance optimization target and the system flow priority distribution optimization target by taking the total size of the flow data received by each electronic control unit as a constraint. According to the invention, the TSN technology is introduced, so that low-delay and high-determinacy data transmission under the condition of high bandwidth is realized in an ink-jet printing system; based on traffic optimization scheduling, a TSN traffic model is designed, a data transmission sequence is determined, and the flexibility and reliability of the system in the data transmission process are improved.

The invention provides a 3D printing rapid prototyping system based on multi-nozzle collaboration.The 3D printing rapid prototyping system based on multi-nozzle collaboration.The 3D printing rapid prototyping system based on multi-nozzle collaborationcomprises a printing unit, a control unit and an auxiliary unit, the printing system comprises a multi-nozzle device and a printing platform, nozzles can be independently controlled, the spacing angle can be adjusted, and the platform can be heated and cooled; the control module covers motion, material and temperature control and central control units, realizes cooperative motion, material supply and temperature control of the spray head and coordinates the work of each unit, and the auxiliary unit comprises a support structure generation and post-processing unit, and the system solves the problems of slow printing speed and limited material color of a traditional single spray head, improves the printing speed, and improves the printing efficiency. Multiple material colors can be printed at the same time, printing quality is improved, and system reliability and stability are enhanced.

The invention discloses a bar code label designing and printing method and system based on an ARM framework and a storage medium. The method comprises the steps that a label template adding instruction is received, a user is prompted to set basic attributes of a label template, the basic attributes are stored, a label design page is initialized, and at least one label control object is preset in the page; in response to a selection instruction of a user for the label control object, adding the selected label control object into the label template, adjusting the attribute of the label control object according to user operation, and generating a label design effect preview; receiving a saving instruction, and prompting a user to confirm the saved information; receiving a storage confirmation instruction, analyzing the label template and converting the label template into a template definition file; compressing the template definition file to generate a label template compressed package; receiving a label printing instruction, decompressing and analyzing the template compressed package, and obtaining a label printing language; generating a printing instruction set according to the label printing language; and printing scheduling is carried out based on a preset scheduling mode, and the printing instruction set is output to a printer.

The invention discloses a quick feeding device for a hand bag decorating machine, and belongs to the technical field of hand bag processing.The quick feeding device for the hand bag decorating machine comprises a feeding mechanism, a plurality of hand bag bodies are arranged on the feeding mechanism, and a straightening mechanism is installed at the rear end of the top of the feeding mechanism; a second feeding assembly is arranged on one side of the feeding mechanism, a supporting frame is arranged on the other side of the second feeding assembly, and a material collecting box is arranged at the top end of the supporting frame. A material rotating mechanism is installed on one side of the front end of the second feeding assembly, and a material pressing mechanism is installed in the center of the top of the second feeding assembly. By designing the feeding mechanism and the straightening mechanism, it is ensured that each batch of hand bags can be accurately fed, material blocking cannot occur in the subsequent material transferring process, and the feeding efficiency of the whole equipment is improved.

The invention discloses an LCD photocuring 3D printer and a method for improving the resolution of the LCD photocuring 3D printer, the angle of light passing through a pixel opening area of an LCD screen is changed by adjusting the angle of a reflector group, the position of a curing light beam in a printing area (photocuring glue) is further influenced, so that the offset of a pixel image is realized, and when the offset is carried out for n times, the position of the curing light beam in the printing area (photocuring glue) is changed. Compared with the prior art, n times of pixel points are added on the basis of an original image, namely, the resolution ratio of the LCD is expanded in a multiplied mode, the effect of improving the resolution ratio of the LCD photocuring 3D printer in a multiplied mode is achieved, meanwhile, the sufficiency and compactness of an exposure area are improved, and the printing yield is improved.

The invention discloses a silk-screen printing device capable of reducing silver paste consumption. The silk-screen printing device comprises a rack; a vibration assembly and a printing table; a leveling assembly; the silk screen assembly comprises a silk screen plate, the printing assembly comprises a translation assembly and a paste scraping assembly, the paste scraping assembly comprises a paste scraping unit, the paste scraping unit comprises a roller and a roller sleeve, and the translation assembly drives the paste scraping assembly to reciprocate in the length direction of the silk screen plate; the movable assembly comprises a lifting unit and an elastic connecting unit; and a butt joint assembly. According to the silk-screen printing device capable of reducing silver paste consumption, the elastic roller sleeve is supported through the rigid roller, silver paste is extruded to penetrate through meshes in the silk-screen plate through the roller sleeve rotating around the axis of the roller sleeve, abrasion of the silk-screen plate is reduced, it is guaranteed that the silver paste is attached to a battery piece after being pressed, the printing quality is improved, and the printing efficiency is improved. The roller sleeve extrudes slurry attached to the surface of the roller sleeve through rotation, the residual amount is reduced, and therefore silver slurry on the silk screen plate can be fully used, and the use amount of the silver slurry is reduced.

The utility model discloses a 3D printing head assembly and a 3D printer, and relates to the technical field of printers, the 3D printing head assembly comprises a printing head body, a nozzle, an extrusion mechanism and a cutting mechanism, the cutting mechanism comprises a cutting groove, a rotating rod and a cutting knife, one end of the rotating rod is rotationally arranged on the printing head body, and the rotating rod can rotate in the direction close to or away from the cutting groove; the cutting knife is arranged on the side, facing the cutting groove, of the rotating rod, and when the rotating rod rotates in the direction close to the cutting groove, the blade part of the cutting knife can stretch into the cutting groove and extend into the feeding channel so as to cut off the wire in the feeding channel. By the adoption of the technical scheme, the wire can be drawn back without passing through the extrusion mechanism when the wire is replaced, the wire unloading process is simplified, the distance between the extrusion mechanism and the nozzle is shortened, the size of the printing head is reduced, meanwhile, the extrusion precision and the response speed of the extrusion mechanism are improved, and the printing quality is improved.

The invention relates to the technical field of 3D printing, in particular to a Z-axis zeroing method and 3D printing equipment. The Z-axis zeroing method comprises the steps that a printing head and a printing platform are controlled to get close, and when the printing head makes contact with the printing platform, approaching operation is stopped; the printing head and the printing platform are controlled to be far away, and when the printing head and the printing platform are separated, far-away operation is stopped. Through a pre-pressing lifting mechanism that the printing head and the printing platform firstly abut against each other and then are separated from each other, deformation errors caused by tiny deformation of abutting contact of the printing head and the printing platform can be eliminated, Z-axis high-precision self-adaptive zeroing is achieved, and due to the fact that the deformation errors caused by contact deformation of the printing head and the printing platform are eliminated, the self-adaptive zeroing efficiency is improved. Therefore, the accuracy of the Z-axis return-to-zero position is improved, the printing quality of the first layer during printing can be ensured, the printing effect of the subsequent layers is also effectively guaranteed, and the precision, efficiency and quality of 3D printing are improved.