Spray head dry wiping mechanism of ink jet type 3D printer

Abstract

The invention relates to a spray head dry wiping mechanism of an ink jet type 3D printer. The spray head dry wiping mechanism comprises a receiving and feeding assembly, a spray head scraping assembly and a rack. The receiving and feeding assembly comprises a feeding roller, a receiving roller, a driving conveying roller, a stepping motor, a second synchronous belt, a third synchronous belt, a knurling wheel, a knurling wheel connecting shaft, a first auxiliary conveying roller and a second auxiliary conveying roller. The feeding roller and the receiving roller are rotationally connected to the front portion and the rear portion of one side of the rack respectively, one end of the driving conveying roller is rotationally connected with one side of the rack, the stepping motor is installed on one side of the rack, and the second synchronous belt is connected with an output shaft of the stepping motor and the driving conveying roller through a synchronous belt wheel. The third synchronous belt is connected with the driving conveying roller and the material collecting roller at the same time. One end of the knurl wheel connecting shaft rotates with the rack, the two ends of the knurl wheel are fixedly connected with the knurl wheel connecting shaft, and a gap exists between the knurl wheel and the driving conveying roller; the first auxiliary conveying roller and the second auxiliary conveying roller are rotationally connected with the upper portion of the rack. And acting force is applied to the dust-free paper through the spray head scraping assembly, so that the dust-free paper and the cleaned spray head are scraped, and the problem of cleaning agent residue is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of 3D printing, and in particular relates to a nozzle dry wiping mechanism of an inkjet 3D printer. Background Art

[0002] With the rapid development of inkjet 3D printing technology, it has been widely used in industrial production. The nozzle needs to be cleaned in time during long-term operation, otherwise there will be adhesive residue or even nozzle blockage. The dripping residue will also contaminate the product, thus affecting the printing effect.

[0003] The existing nozzles do not have a self-cleaning function, and usually require an additional cleaning device to automatically clean the nozzle after the nozzle finishes spraying the current layer. However, there will be residual cleaning agent in the nozzle after cleaning, so it needs to be wiped in time to prevent the residue from dripping onto the printout. The invention application with application number 202410659819.2 discloses a nozzle wet wiping structure, a nozzle wiping mechanism and a glue spraying system. The nozzle wet wiping structure includes a first box body, a first wiping member, a first rotating shaft assembly and a first driving member. The first box body has a first accommodating chamber for holding a solvent. The first wiping member is rotatably connected to the first box body through a first rotating shaft assembly. The first wiping member has a first wiping surface for wiping the nozzle, and the first wiping surface is immersed in the solvent. The residual glue remaining after the first wiping surface wipes the nozzle will be dissolved by the solvent in the first accommodating chamber, ensuring that the surface of the first wiping surface is clean, and further ensuring the wiping effect of the nozzle. The nozzle is wiped by immersing the first wiping surface in the solvent to ensure the cleaning effect of the residual glue on the nozzle. However, there is solvent residue on the nozzle after wiping, and solvent dripping will also affect the printing quality.

[0004] The invention application with application number 202280021679.5 discloses a cleaning system for inkjet nozzles in a digital printing system, including an image forming station, which includes at least a nozzle plate having one or more nozzles, the nozzles being configured to apply droplets of a printing fluid to the surface of one or more substrates to produce one or more images thereon; and a wiping assembly, which is at least partially positioned in a gap between the nozzle plate and the one or more substrates, and is configured to physically contact the nozzle plate when the system is in a printing position to remove the residue of the printing fluid. The wiping assembly contacts the nozzle plate to wipe off the residue, but there is still print glue residue on the wiping surface.

[0005] In order to solve the above technical problems, the present invention proposes a dry wiping mechanism for the nozzle of an inkjet 3D printer, which is used to dry wipe the nozzle after being cleaned by a detergent to avoid detergent residue, thereby improving the cleaning degree of the nozzle and improving the printing quality. Summary of the invention

[0006] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a dry wiping mechanism for the nozzle of an inkjet 3D printer to solve the problem of residual cleaning agent in the nozzle of the inkjet 3D printer.

[0007] The technical solution adopted by the present invention to solve the technical problem is:

[0008] A nozzle dry wiping mechanism for an inkjet 3D printer, characterized in that the mechanism comprises a feeding and receiving assembly, a nozzle scraping assembly and a frame; the feeding and receiving assembly comprises a feeding roller, a receiving roller, an active transmission roller, a stepping motor, a second synchronous belt, a third synchronous belt, a knurling wheel, a knurling wheel connecting shaft, a first auxiliary transmission roller and a second auxiliary transmission roller;

[0009] Among them, the feeding roller and the receiving roller are rotatably connected to the front and rear of one side of the frame respectively, one end of the active transmission roller is rotatably connected to one side of the frame and is located obliquely in front of the receiving roller, the stepper motor is installed on one side of the frame, the No. 2 synchronous belt is connected to the output shaft of the stepper motor and the active transmission roller through the synchronous belt pulley, and the No. 3 synchronous belt is connected to the active transmission roller and the receiving roller at the same time; one end of the knurling wheel connecting shaft rotates with the frame, and the two ends of the knurling wheel are fixedly connected to the knurling wheel connecting shaft, and there is a gap between the knurling wheel and the active transmission roller for the dust-free paper to pass through; the No. 1 auxiliary transmission roller and the No. 2 auxiliary transmission roller are rotatably connected to the upper part of the frame, and the dust-free paper is led out from the feeding roller, bypasses the No. 1 auxiliary transmission roller and the No. 2 auxiliary transmission roller in turn, passes through the gap between the active transmission roller and the knurling wheel, and is finally wound on the receiving roller;

[0010] The nozzle scraping assembly includes a scraper, a scraper clamp and a No. 2 cylinder; the No. 2 cylinder is located in the middle of the other side of the frame, the scraper clamp is fixedly connected to the rod end of the No. 2 cylinder, the scraper is installed on the scraper clamp, and the scraper is located between the No. 1 auxiliary conveying roller and the No. 2 auxiliary conveying roller;

[0011] Furthermore, the material receiving and feeding assembly also includes a No. 1 cylinder and a pressure plate; the No. 1 cylinder is fixedly connected to one side of the frame, and the pressure plate is fixed to the rod end of the No. 1 cylinder. The pressure plate pops out and can be in close contact with the dust-free paper on the No. 1 auxiliary conveying roller.

[0012] Furthermore, the material receiving and feeding assembly also includes a reel locking block, a locking block wrench, a magnetic damper and a No. 1 synchronous belt; the reel locking block is mounted on the free end of the feed roller, the locking block wrench is threadedly connected to the reel locking block, and the No. 1 synchronous belt is simultaneously connected to the output end of the magnetic damper and the feed roller.

[0013] Furthermore, the active transmission roller adopts a rubber-coated wheel, and the diameter ratio of the rubber-coated wheel to the knurled wheel is 1.1:1-1.6:1.

[0014] Furthermore, when not in operation, a safety gap of 0.5-2 mm is maintained between the dust-free paper and the nozzle; when wiping, a pressure of 2-5 mm is maintained between the dust-free paper and the nozzle.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The stepper motor drives the active transmission roller to rotate, which can drive the feeding roller and the receiving roller to rotate synchronously, realizing the synchronization of dust-free paper feeding and recycling; when the nozzle is about to pass over the scraper, the No. 2 cylinder drives the scraper to bounce up, exerting force on the dust-free paper, and using the dust-free paper to efficiently scrape the cleaned nozzle, realizing dry wiping of the nozzle and avoiding detergent residue. The entire mechanism can achieve thorough cleaning of the nozzle through the dynamic coordination of the wiping action and the nozzle movement, avoiding adhesive and cleaning agent residues, and reducing the risk of nozzle clogging.

[0017] 2. The knurled wheel and the active transmission wheel cooperate to squeeze the dust-free paper, which can avoid paper distortion and deviation and ensure the smooth transmission of dust-free paper. The other end of the knurled wheel connecting shaft is fixed with a knurled wheel wrench. Manually rotating the knurled wheel wrench can rotate the knurled wheel, and then lift the knurled wheel to facilitate the loading and unloading of dust-free paper. The combination of magnetic damper and synchronous motor realizes the stability of dust-free paper transmission, ensuring that there is no looseness or distortion in the transmission.

[0018] 3. This mechanism can be used as a modular structure and combined with the existing inkjet 3D printer to solve the problems of incomplete cleaning of the existing nozzles, residual cleaning agents, low efficiency, and poor automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a structural schematic diagram of the present invention with one side of the frame removed;

[0021] Figure 3 It is a structural schematic diagram of a part of the material receiving and delivering component of the present invention;

[0022] Figure 4 It is a structural schematic diagram of another part of the material receiving and delivering assembly of the present invention;

[0023] In the figure: 1-feeding and receiving assembly; 2-spray head scraping assembly; 3-frame; 4-dust-free paper;

[0024] 101-feeding roller; 102-reel locking block; 103-locking block wrench; 104-magnetic damper; 105-No. 1 synchronous belt; 106-receiving roller; 107-active transmission roller; 108-stepping motor; 109-No. 2 synchronous belt; 110-No. 3 synchronous belt; 111-knurling wheel; 112-knurling wheel connecting shaft; 113-knurling wheel wrench; 114-No. 1 auxiliary transmission roller; 115-No. 2 auxiliary transmission roller; 116-No. 1 cylinder; 117-pressing plate; 118-material break sensor; 201-scraper; 202-scraper clamp; 203-No. 2 cylinder. DETAILED DESCRIPTION

[0025] Specific embodiments are given below in conjunction with the accompanying drawings. The specific embodiments are only used to introduce the technical solutions of the present invention in detail and are not intended to limit the protection scope of the present application.

[0026] See also Figures 1 to 4 The present invention provides a nozzle dry wiping mechanism for an inkjet 3D printer, comprising a material receiving and feeding assembly 1, a nozzle scraping assembly 2 and a frame 3; the material receiving and feeding assembly 1 and the nozzle scraping assembly 2 are both connected to the frame 3, the material receiving and feeding assembly 1 is used to transmit dust-free paper 4, and the nozzle scraping assembly 2 maintains a certain contact pressure between the dust-free paper 4 and the nozzle, so that the dust-free paper 4 wipes the cleaned nozzle.

[0027] The feeding and receiving assembly 1 includes a feeding roller 101, a reel locking block 102, a locking block wrench 103, a magnetic damper 104, a first synchronous belt 105, a receiving roller 106, an active transmission roller 107, a stepping motor 108, a second synchronous belt 109, a third synchronous belt 110, a knurled wheel 111, a knurled wheel connecting shaft 112, a knurled wheel wrench 113, a first auxiliary transmission roller 114 and a second auxiliary transmission roller 115;

[0028] Among them, the feeding roller 101 is rotatably connected to the front part of one side of the frame 3, the dust-free paper roll is sleeved on the feeding roller 101, and the roll locking block 102 is sleeved on the free end of the feeding roller 101 to limit the dust-free paper roll axially and facilitate the replacement of dust-free paper. The locking block wrench 103 is threadedly connected to the roll locking block 102, and the roll locking block 102 and the feeding roller 101 are fixed by rotating the locking block wrench 103; the magnetic damper 104 is connected to the frame 3, and the No. 1 synchronous belt 105 is simultaneously connected to the output end of the magnetic damper 104 and the feeding roller 101, and the feeding speed and tension of the dust-free paper are controlled by the magnetic damper 104; the receiving roller 106 is rotatably connected to the rear part of one side of the frame 3, and the used dust-free paper is wound on the receiving roller 106 to realize the recycling of dust-free paper;

[0029] One end of the active conveying roller 107 is rotatably connected to one side of the frame 3, and the active conveying roller 107 is located obliquely in front of the receiving roller 106. The stepper motor 108 is installed on one side of the frame 3. The No. 2 synchronous belt 109 is connected to the output shaft of the stepper motor 108 and the active conveying roller 107 through the synchronous belt pulley respectively. The No. 3 synchronous belt 110 is connected to the active conveying roller 107 and the receiving roller 106 at the same time. The active conveying roller 107 and the receiving roller 106 are driven by the stepper motor 108 to rotate synchronously, realizing dust-free paper transmission while also realizing dust-free paper recovery. The moving step length of the dust-free paper is controlled by the stepper motor 108 to ensure smooth and uniform transportation of the dust-free paper; one end of the knurling wheel connecting shaft 112 rotates with the frame 3 and is located obliquely behind the active conveying roller 107. Both ends of the knurling wheel 111 are fixedly connected to the knurling wheel connecting shaft 112 through side ears. There is a gap between the active conveying roller 107 for the dust-free paper to pass through. The dust-free paper is squeezed by the knurling wheel 111 and the active conveying roller 107, which limits the direction of the dust-free paper and prevents the dust-free paper from twisting and deflecting; the knurling wheel wrench 113 is fixedly connected to the other end of the knurling wheel connecting shaft 112. The knurling wheel wrench 113 is manually rotated to rotate the knurling wheel connecting shaft 112, and the knurling wheel 111 rotates together with the knurling wheel connecting shaft 112, so that the knurling wheel 111 is lifted upward to facilitate the loading and unloading of dust-free paper; the No. 1 auxiliary conveying roller 114 and the No. 2 auxiliary conveying roller 115 are rotatably connected to the upper part of the frame 3, which guides the dust-free paper. The dust-free paper is led out from the feeding roller 101, bypasses the No. 1 auxiliary conveying roller 114 and the No. 2 auxiliary conveying roller 115 in turn, passes through the gap between the active conveying roller 107 and the knurling wheel 111, and is finally wound on the receiving roller 106.

[0030] The material receiving and feeding assembly 1 also includes a No. 1 cylinder 116, a pressure plate 117 and a material break sensor 118; the No. 1 cylinder 116 is fixedly connected to one side of the frame 3, and the pressure plate 117 is fixed to the rod end of the No. 1 cylinder 116. When the No. 1 cylinder 116 is inflated, the air pressure in the cylinder increases rapidly, pushing its rod end to pop out, causing the pressure plate 117 to pop out and come into close contact with the dust-free paper on the No. 1 auxiliary conveying roller 114, thereby locking the dust-free paper; when the No. 1 cylinder 116 is deflated, the air pressure in the cylinder is quickly released, and its rod end is retracted, causing the pressure plate 117 to break contact with the dust-free paper, thereby unlocking the dust-free paper; the material break sensor 118 is used to detect whether the dust-free paper is out of material, which is conducive to automatic alarm when the dust-free paper is out of material.

[0031] The nozzle scraping assembly 2 includes a scraper 201, a scraper clamp 202 and a No. 2 cylinder 203; wherein, the No. 2 cylinder 203 is installed in the middle of the other side of the frame 3, the scraper clamp 202 is fixedly connected to the rod end of the No. 2 cylinder 203, the scraper 201 is fixedly connected to the scraper clamp 202, and the scraper 201 is located between the No. 1 auxiliary conveying roller 114 and the No. 2 auxiliary conveying roller 115; the scraper 201 is popped out and retracted by the inflation and deflation of the No. 2 cylinder 203, the inflation of the No. 2 cylinder 203 causes the scraper 201 to pop up and exert a force on the dust-free paper, so that a certain contact pressure is maintained between the dust-free paper and the nozzle, ensuring that the nozzle can wipe and clean the dust-free paper when it passes by, avoiding the influence of residues on the printing quality; the deflation of the No. 2 cylinder 203 causes the scraper 201 to be retracted to its initial position.

[0032] The edge of the scraper 201 in contact with the dust-free paper is arc-shaped and has an acute angle, such as a 60° acute angle, to increase the pressure per unit area of ​​contact with the dust-free paper, improve the scraping efficiency, and avoid paper tearing due to a small angle. In the non-working state, a safety gap of 0.5-2mm must be maintained between the dust-free paper and the nozzle to prevent collision; when wiping, a pressure of 2 to 5mm must be maintained between the dust-free paper and the nozzle to ensure effective contact between the dust-free paper and the nozzle without damaging the nozzle. The spacing between the scraper 201 and the first auxiliary conveying roller 114 and the second auxiliary conveying roller 115 is 8-12mm to maintain paper tension and avoid sagging or excessive stretching due to gravity. The dust-free paper needs to ensure that fibers do not fall off during the wiping process to prevent the nozzle from being contaminated again.

[0033] The active transmission roller 107 is a rubber-coated wheel, and the diameter ratio of the rubber-coated wheel to the knurled wheel 111 is 1.1:1-1.6:1 to compensate for the deformation of the rubber coating; the surface texture of the knurled wheel 111 (such as diamond knurling) can increase the friction and prevent the dust-free paper from slipping. The active transmission roller 107 is responsible for driving the dust-free paper, while the knurled wheel 111 provides reverse tension. The elastic-rigid coupling effect of the rubber-coated wheel and the knurled wheel 111 is used to achieve fine adjustment of the extrusion force, balance the fluctuation of paper thickness, and avoid paper jams and slipping.

[0034] The working principle and workflow of the present invention are:

[0035] In the initial state, cylinder No. 1 116 is inflated and cylinder No. 2 203 is not inflated.

[0036] When the mechanism starts to work, the No. 1 cylinder 116 is deflated to quickly release the air pressure in the cylinder, and its rod end is retracted, so that the pressure plate 117 is out of contact with the dust-free paper, thereby unlocking the dust-free paper; the stepper motor 108 is started to drive the active conveying roller 107 and the receiving roller 106 to rotate synchronously, so that the dust-free paper is drawn out from the feeding roller 101, and successively bypasses the No. 1 auxiliary conveying roller 114 and the No. 2 auxiliary conveying roller 115, and passes through the gap between the active conveying roller 107 and the knurling wheel 111, and the used dust-free paper is wound around the receiving roller 106 to realize the conveyance of the dust-free paper; when the nozzle is about to pass the wiping position, the No. 2 cylinder 203 is inflated to quickly increase the air pressure in the cylinder, so that the scraper 201 bounces up and pushes the dust-free paper upward, and when the nozzle passes the wiping position after cleaning, the dust-free paper wipes it, and a certain contact pressure is applied between the dust-free paper and the nozzle through the scraper 201 to ensure the wiping effect. After wiping is completed, the second cylinder 203 is deflated to release the air pressure in the cylinder quickly, and the scraper 201 is retracted to the initial state, waiting for the next wiping. This mechanism realizes automatic cleaning of the nozzle through the synergy with the external nozzle cleaning structure.

[0037] Any matters not described in the present invention are applicable to the prior art.

Claims

1. A dry wiping mechanism for a nozzle of an inkjet 3D printer, characterized in that: The mechanism includes a material receiving and feeding assembly, a nozzle scraping assembly and a frame; the material receiving and feeding assembly includes a feeding roller, a receiving roller, an active transmission roller, a stepping motor, a second synchronous belt, a third synchronous belt, a knurling wheel, a knurling wheel connecting shaft, a first auxiliary transmission roller and a second auxiliary transmission roller; Among them, the feeding roller and the receiving roller are rotatably connected to the front and rear of one side of the frame respectively, one end of the active transmission roller is rotatably connected to one side of the frame and is located obliquely in front of the receiving roller, the stepper motor is installed on one side of the frame, the No. 2 synchronous belt is connected to the output shaft of the stepper motor and the active transmission roller through the synchronous belt pulley, and the No. 3 synchronous belt is connected to the active transmission roller and the receiving roller at the same time; one end of the knurling wheel connecting shaft rotates with the frame, and the two ends of the knurling wheel are fixedly connected to the knurling wheel connecting shaft, and there is a gap between the knurling wheel and the active transmission roller for the dust-free paper to pass through; the No. 1 auxiliary transmission roller and the No. 2 auxiliary transmission roller are rotatably connected to the upper part of the frame, and the dust-free paper is led out from the feeding roller, bypasses the No. 1 auxiliary transmission roller and the No. 2 auxiliary transmission roller in turn, passes through the gap between the active transmission roller and the knurling wheel, and is finally wound on the receiving roller; The nozzle scraping assembly includes a scraper, a scraper clamp and a No. 2 cylinder; the No. 2 cylinder is located in the middle of the other side of the frame, the scraper clamp is fixedly connected to the rod end of the No. 2 cylinder, the scraper is installed on the scraper clamp, and the scraper is located between the No. 1 auxiliary conveying roller and the No. 2 auxiliary conveying roller.

2. The dry wiping mechanism for the nozzle of the inkjet 3D printer according to claim 1, characterized in that: The material receiving and feeding assembly also includes a No. 1 cylinder and a pressure plate; the No. 1 cylinder is fixedly connected to one side of the frame, and the pressure plate is fixed to the rod end of the No. 1 cylinder. The pressure plate pops out and can be in close contact with the dust-free paper on the No. 1 auxiliary conveying roller.

3. The dry wiping mechanism for the nozzle of an inkjet 3D printer according to claim 1 or 2, characterized in that: The material receiving and feeding assembly also includes a reel locking block, a locking block wrench, a magnetic damper and a No. 1 synchronous belt; the reel locking block is sleeved on the free end of the feeding roller, the locking block wrench is threadedly connected to the reel locking block, and the No. 1 synchronous belt is simultaneously connected to the output end of the magnetic damper and the feeding roller.

4. The dry wiping mechanism for the inkjet 3D printer according to claim 1, characterized in that: The active transmission roller adopts a rubber-coated wheel, and the diameter ratio of the rubber-coated wheel to the knurled wheel is 1.1:1-1.6:

1.

5. The dry wiping mechanism for the nozzle of an inkjet 3D printer according to claim 1 or 4, characterized in that: When not in operation, a safety gap of 0.5-2mm is maintained between the dust-free paper and the nozzle; when wiping, a pressure of 2-5mm is maintained between the dust-free paper and the nozzle.

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