Printing head with variable nozzle

Abstract

The invention discloses a printing head with a variable nozzle, and relates to the technical field of printing heads of 3D printers. The shell is arranged on the spray head body, a feeding pipe and a discharging pipe are arranged on the spray head body, and a heater is arranged on the discharging pipe; a feeding assembly; a sliding hole is vertically formed in the mounting base, a sliding rod is arranged in the sliding hole in a sliding mode, a spiral groove is formed in the outer wall of the lower portion of the sliding rod, and a straight groove is vertically formed in the outer wall of the upper portion of the sliding rod; the guide rod is arranged on the mounting seat, and a connecting plate is arranged at the bottom of the sliding rod; the cleaning column is connected with the connecting plate; and the lifting assembly is arranged on the spray head body. The lifting assembly drives the sliding rod to ascend and descend, meanwhile, the guide rod is matched with the spiral groove and the straight groove, in the descending process of the sliding rod, the cleaning column is firstly driven to rotate to the position over the discharging pipe, then the sliding rod continues to descend, part of residual wires attached to the pipe opening of the discharging pipe are pushed into the discharging pipe, and the situation that new wires cannot enter the discharging pipe is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printer print heads, in particular to a print head with a variable nozzle. Background Art

[0002] 3D printer, also known as three-dimensional printer, is a kind of cumulative manufacturing technology, that is, a machine of rapid prototyping technology. It is based on a digital model file, using special wax materials, powdered metal or plastic and other adhesive materials to print layers of adhesive materials to make three-dimensional objects. At present, 3D printers are used to manufacture products. The technology of constructing objects by printing layer by layer. The principle of 3D printer is to put data and raw materials into the 3D printer, and the machine will make the product layer by layer according to the program. There are many types of 3D printers, including FDM 3D printers, DLP 3D printers, etc. Among them, FDM 3D printers are usually composed of a nozzle body, a feed pipe, a discharge pipe, and a feed assembly. The feed assembly pushes the filament extending from the feed pipe into the discharge pipe. A heating assembly is provided on the discharge pipe to heat the discharge pipe so that the filament melts and sprays out from the discharge pipe.

[0003] When the wire is almost used up, it is necessary to change the material. When changing the wire, the feeding assembly needs to pull out the remaining wire. However, during the pulling out process, there is a probability that some melted wire in the discharge tube will be pulled to the upper end of the discharge tube. The temperature at the upper end of the discharge tube is not enough to melt the wire, so these melted wires solidify at the upper end of the discharge tube. The wire material is relatively soft, making it difficult for the feeding assembly to push the new wire into the discharge tube. Summary of the invention

[0004] The purpose of the present invention is to provide a print head with a variable nozzle, which drives the slide bar to rise and fall through the cooperation of the slide bar and the lifting assembly. At the same time, the guide rod cooperates with the spiral groove and the straight groove, so that during the descent of the slide bar, the cleaning column is first driven to rotate to the top of the discharge pipe, and then continues to descend, pushing part of the residual wire attached to the outlet of the discharge pipe into the discharge pipe, thereby avoiding the situation where the new wire cannot enter the discharge pipe.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a print head with a variable nozzle, comprising a nozzle body; a shell, the shell is arranged on the nozzle body, a feed pipe and a discharge pipe are arranged on the nozzle body, and a heater is arranged on the discharge pipe; a feeding assembly, the feeding assembly is arranged on the nozzle body and is located between the feed pipe and the discharge pipe; a mounting seat, the mounting seat is arranged on the nozzle body, a sliding hole is vertically opened on the mounting seat, a sliding rod is slidably arranged in the sliding hole, a spiral groove is opened on the lower outer wall of the sliding rod, a straight groove is vertically opened on the upper outer wall of the sliding rod, and the lower end of the straight groove is connected with the upper end of the spiral groove; a guide rod, the guide rod is arranged on the mounting seat, one end of the guide rod is placed in the spiral groove, and a connecting plate is arranged at the bottom of the sliding rod; a cleaning column, the cleaning column is connected to the bottom of the connecting plate away from one end of the sliding rod; and also includes a lifting assembly, the lifting assembly is arranged on the nozzle body, and is used to drive the sliding rod to rise and fall.

[0006] Preferably, the feeding assembly includes: a first driving motor, which is arranged on the nozzle body, and a first gear is arranged on the output shaft of the first driving motor; a second driving motor, which is horizontally slidably arranged on the nozzle body, and a sliding assembly for driving the second driving motor to slide is arranged on the nozzle body, and a second gear is arranged on the output shaft of the second driving motor, and the second gear is horizontally spaced apart from the first gear.

[0007] Preferably, the lifting assembly includes: a top plate, which is rotatably arranged on the top of the sliding rod, a sliding groove is arranged on the side of the mounting seat adjacent to the first gear, a rack is vertically slidably arranged in the sliding groove, and the top of the rack is connected to the top plate; a mounting column, which is horizontally arranged on the nozzle body, a concentrically arranged rotating shaft is rotatably arranged on the mounting column, a driving gear is arranged on the rotating shaft, and the driving gear is meshed with the rack; a rotating unit, which is used to drive the rotating shaft to rotate.

[0008] Preferably, the rotating unit comprises: a mounting plate, which is arranged on the nozzle body and below the first gear, two vertically arranged upright plates are spaced apart on the mounting plate, each of the upright plates is provided with a receiving hole concentrically arranged with the first gear, a rotating block is rotatably arranged in the receiving hole, a square hole is provided on the rotating block, a square rod is slidably arranged in two of the square holes, a driving pulley is slidably sleeved on the rod body of the square rod located between the two rotating blocks, a driven pulley is provided on the rotating shaft, and the driven pulley is connected to the driving pulley through a transmission belt; a socket, which is concentrically arranged on the first gear, a socket hole is horizontally provided on the socket, and the square rod is frustum-shaped at one end adjacent to the socket.

[0009] Preferably, a vertical plate is further provided on the mounting plate, a square fixing hole is opened on the vertical plate, a square block is provided on the side of the square rod away from the first gear, and the square block is in a frustum shape on the side away from the first gear.

[0010] Preferably, a sliding seat is slidably provided on the mounting plate, a control rod is rotatably provided on the sliding seat, one end of the control rod is connected to the square rod, and the other end passes through the outer shell, a tension spring is provided between the sliding seat and the outer shell, one end of the tension spring is connected to the sliding seat, and the other end is connected to the outer shell, and a limit component for limiting the position of the control rod is also provided on the outer shell.

[0011] Preferably, the limit assembly includes: a rotating column, which is rotatably arranged on the outer shell, a circular hole is concentrically opened on the rotating column, the control rod is rotatably connected to the circular hole, a receiving groove is opened at one end of the rotating column adjacent to the outer shell, an arc groove connected to the receiving groove is also arranged on the side of the rotating column adjacent to the outer shell, a limiting groove is opened at one end of the arc groove away from the receiving groove, and the limiting groove, the arc groove and the receiving groove are all connected with the circular hole; a limiting column, which is arranged on the control rod and placed in the receiving groove.

[0012] Preferably, two fixing plates are spaced apart on the nozzle body, two guide rods are spaced apart between the two fixing plates, a connecting seat is provided on the second driving motor, a guide hole is provided at the bottom of the connecting seat corresponding to the guide rod, and the guide hole is slidably connected to the guide rod.

[0013] Preferably, the sliding assembly includes a threaded rod rotatably arranged between two fixed plates, the connecting seat is screwed together with the threaded rod through a threaded hole, and one end of the threaded rod passes through one of the fixed plates and the outer shell and is provided with a screwing handle.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention cooperates with the mounting seat, sliding rod, guide rod and cleaning column through the provided use, and can be connected with the plug-in seat and the first gear through the square rod, so that the first gear, the plug-in seat and the square rod are driven to rotate by the first driving motor, and then the first pulley, the second pulley and the active gear can be driven to rotate, so as to control the rack to move up and down, and the rack moves up and down to drive the top plate, the sliding rod, the connecting plate and the cleaning column to move up and down. When the sliding rod descends, under the action of the spiral groove, the straight groove and the guide rod, the sliding rod will first rotate 180 degrees during the descent process to make the cleaning column concentric with the discharge pipe, and then continue to descend to push part of the residual wire attached to the pipe mouth of the discharge pipe into the discharge pipe, so as to avoid the situation that the new wire cannot enter the discharge pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 It is a structural schematic diagram of the cleaning mechanism, lifting assembly and limiting assembly of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the discharge pipe and the limit assembly of the present invention;

[0019] Figure 4 for Figure 3 A magnified view of part A;

[0020] Figure 5 It is a structural schematic diagram of the cleaning mechanism and lifting assembly of the present invention;

[0021] Figure 6 for Figure 5 A magnified view of part B;

[0022] Figure 7 for Figure 5 Enlarged view of part C;

[0023] Figure 8 It is a structural schematic diagram of the feeding assembly and the mounting plate of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of the feeding assembly and the sliding assembly of the present invention;

[0025] Fig.10 It is a schematic structural diagram of the rotating column of the present invention;

[0026] Fig.11 It is a schematic structural diagram of the control rod and the limiting column of the present invention.

[0027] In the figure: 10, nozzle body; 11, shell; 12, feed pipe; 13, discharge pipe; 14, heater; 15, fixing plate; 16, guide rod; 20, feeding assembly; 21, first drive motor; 22, first gear; 23, second drive motor; 24, second gear; 25, connecting seat; 31, mounting seat; 32, slide rod; 33, spiral groove; 34, guide rod; 35, straight groove; 36, connecting plate; 37, cleaning column; 40, lifting assembly; 41, top plate; 42, slide groove; 43, rack; 44, mounting column; 45, rotating shaft; 46, Driving gear; 50, sliding assembly; 51, threaded rod; 52, screw handle; 60, rotating unit; 61, mounting plate; 62, vertical plate; 63, rotating block; 631, square hole; 64, square rod; 65, driving pulley; 66, driven pulley; 67, transmission belt; 68, plug-in seat; 69, plug-in hole; 70, vertical plate; 71, fixing hole; 72, square block; 80, sliding seat; 81, control rod; 82, tension spring; 90, limit assembly; 91, rotating column; 92, accommodating groove; 93, arc groove; 94, limit groove; 95, limit column. DETAILED DESCRIPTION

[0028] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. The following describes various embodiments of the present invention in detail in conjunction with the drawings.

[0029] See also Figures 1 to 11The present invention preferably provides a technical solution: a print head with a variable nozzle, comprising a nozzle body 10; a shell 11, the shell 11 is arranged on the nozzle body 10, a feed pipe 12 and a discharge pipe 13 are arranged on the nozzle body 10, and a heater 14 is arranged on the discharge pipe 13; a feed assembly 20, the feed assembly 20 is arranged on the nozzle body 10 and is located between the feed pipe 12 and the discharge pipe 13; a mounting seat 31, the mounting seat 31 is arranged on the nozzle body 10, a sliding hole is vertically opened on the mounting seat 31, and a sliding rod is slidably arranged in the sliding hole 32, a spiral groove 33 is provided on the lower outer wall of the slide rod 32, a straight groove 35 is vertically provided on the upper outer wall of the slide rod 32, and the lower end of the straight groove 35 is connected to the upper end of the spiral groove 33; a guide rod 34, the guide rod 34 is arranged on the mounting seat 31, one end of the guide rod 34 is placed in the spiral groove 33, and a connecting plate 36 is provided at the bottom of the slide rod 32; a cleaning column 37, the cleaning column 37 is connected to the bottom of the connecting plate 36 away from the end of the slide rod 32; it also includes a lifting component 40, the lifting component 40 is arranged on the nozzle body 10, and is used to drive the slide rod 32 to rise and fall.

[0030] There are two symmetrical thread grooves on the slide rod 32, two symmetrical straight grooves 35 are also provided on the slide rod 32, and there are two guide rods 34, which are symmetrically arranged on the mounting seat 31. The number of rotations of the spiral groove 33 is half a circle, the groove width of the spiral groove 33 is consistent with the groove width of the straight groove 35, and the groove wall where the spiral groove 33 and the straight groove 35 are connected has an arc transition.

[0031] In this embodiment, the lifting assembly 40 is provided to drive the slide bar 32 to rise and fall. When the slide bar 32 is driven to descend, due to the cooperation between the spiral groove 33 and the guide rod 34, the slide bar 32 first rotates 180 degrees, driving the connecting plate 36 and the cleaning column 37 to rotate, so that the cleaning column 37 is located directly above the nozzle of the discharge pipe 13. Then the guide rod 34 slides into the straight groove 35, so that the slide bar 32 descends stably, and the cleaning column 37 is inserted into the discharge pipe 13, pushing some residual wire attached to the nozzle of the discharge pipe 13 into the discharge pipe 13, thereby preventing the new wire from being unable to enter the discharge pipe 13.

[0032] Furthermore, the feeding assembly 20 includes: a first driving motor 21, which is arranged on the nozzle body 10, and a first gear 22 is arranged on the output shaft of the first driving motor 21; a second driving motor 23, which is horizontally slidably arranged on the nozzle body 10, and a sliding assembly 50 for driving the second driving motor 23 to slide is arranged on the nozzle body 10, and a second gear 24 is arranged on the output shaft of the second driving motor 23, and the second gear 24 is horizontally spaced apart from the first gear 22.

[0033] When the print head is in working state, one side of the wire extending from the feed pipe 12 contacts the nozzle body 10, and the other two sides contact the first gear 22 and the second gear 24 respectively. The distance between the first gear 22 and the second gear 24 is slightly smaller than the diameter of the wire.

[0034] Combination Figure 8 , 9 As shown, after the wire enters from the feed pipe 12, the two sides of the wire are in contact with the first gear 22 and the second gear 24 respectively, the first drive motor 21 drives the first gear 22 to rotate, and the second drive motor 23 drives the second gear 24 to rotate. The rotation directions of the first gear 22 and the second gear 24 are opposite, and the wire is continuously transported to the discharge pipe 13. When changing the wire, before cleaning the outlet of the discharge pipe 13, the sliding assembly 50 drives the second drive motor 23 to slide and move the second gear 24 to avoid interference with the cleaning column 37 rotating to the top of the discharge pipe 13.

[0035] Furthermore, the lifting assembly 40 includes: a top plate 41, which is rotatably arranged on the top of the sliding rod 32, and a sliding groove 42 is arranged on the side of the mounting seat 31 adjacent to the first gear 22, and a rack 43 is vertically slidably arranged in the sliding groove 42, and the top of the rack 43 is connected to the top plate 41; a mounting column 44, which is horizontally arranged on the nozzle body 10, and a concentrically arranged rotating shaft 45 is rotatably arranged on the mounting column 44, and a driving gear 46 is arranged on the rotating shaft 45, and the driving gear 46 is meshed with the rack 43; a rotating unit 60, and the rotating unit 60 is used to drive the rotating shaft 45 to rotate.

[0036] like Figure 5 As shown, the rotating unit 60 drives the rotating shaft 45 to rotate, driving the driving gear 46 to rotate. Since the driving gear 46 is engaged with the rack 43, the driving gear 46 rotates to control the lifting of the rack 43, driving the top plate 41 and the sliding rod 32 to lift. The sliding rod 32 is rotatably connected to the top plate 41, so that the sliding rod 32 can rotate relative to the top plate 41.

[0037] Furthermore, the rotating unit 60 includes: a mounting plate 61, which is arranged on the nozzle body 10 and is located below the first gear 22, two vertically arranged vertical plates 62 are arranged at intervals on the mounting plate 61, and each of the vertical plates 62 is provided with a receiving hole arranged concentrically with the first gear 22, a rotating block 63 is rotatably arranged in the receiving hole, a square hole 631 is opened on the rotating block 63, and a square rod 64 is slidably arranged in the two square holes 631, and the square rod 64 is located between the two rotating blocks 63. A driving pulley 65 is slidably sleeved on the rod body, and a driven pulley 66 is arranged on the rotating shaft 45, and the driven pulley 66 is connected to the driving pulley 65 through a transmission belt 67; a socket 68, the socket 68 is concentrically arranged on the first gear 22, and a socket hole 69 is horizontally opened on the socket 68, and the square rod 64 is cone-shaped at one end adjacent to the socket 68.

[0038] like Figure 5 , 7 As shown in Figures 8 and 9, the rotating block 63 can rotate in the accommodating hole, so that the square rod 64 can rotate and slide in the square hole 631. When the print head is working normally, the square rod 64 does not contact the plug hole 69. When the outlet pipe 13 needs to be cleaned, the square rod 64 is inserted into the plug hole 69, and the first drive motor 21 drives the first gear 22 and the plug socket 68 to rotate, thereby driving the active pulley 65 and the driven pulley 66 to rotate, and then driving the rotating shaft 45 to rotate. The end of the square rod 64 adjacent to the plug socket 68 is in a cone shape, which is convenient for the square rod 64 to be inserted into the plug hole 69. The rotating shaft 45 does not need an additional motor to drive the rotation, thereby reducing the production cost of the print head.

[0039] Furthermore, a vertical plate 70 is provided on the mounting plate 61 , and a square fixing hole 71 is opened on the vertical plate 70 . A square block 72 is provided on the side of the square rod 64 away from the first gear 22 , and the side of the square block 72 away from the first gear 22 is in a frustum shape.

[0040] like Figure 7 , 8 As shown, when the end of the square rod 64 is placed in the plug hole 69, the square block 72 is outside the fixing hole 71. After the cleaning of the nozzle of the discharge pipe 13 is completed, the lifting assembly 40 drives the slide bar 32 to rise and reset, and then separates the square rod 64 from the plug hole 69. At this time, the square block 72 slides into the fixing hole 71, restricting the square rod 64 from rotating, thereby fixing the position of the slide bar 32 and the cleaning column 37. The square block 72 is frustum-shaped on the side away from the first gear 22. Under the action of the frustum-shaped edges, it is easy for the square block 72 to slide into the fixing hole 71. In the process of the square block 72 sliding into the fixing hole 71, when the square block 72 does not overlap with the fixing hole 71, the square block 72 will rotate to drive the square rod 64 to rotate slightly.

[0041] Furthermore, a sliding seat 80 is slidably provided on the mounting plate 61, and a control rod 81 is rotatably provided on the sliding seat 80, one end of the control rod 81 is connected to the square rod 64, and the other end passes through the outer shell 11, a tension spring 82 is provided between the sliding seat 80 and the outer shell 11, one end of the tension spring 82 is connected to the sliding seat 80, and the other end is connected to the outer shell 11, and a limit component 90 for limiting the position of the control rod 81 is also provided on the outer shell 11.

[0042] like Figure 3 , 4 As shown, the tension spring 82 limits the position of the sliding seat 80 and the control rod 81, thereby limiting the position of the square rod 64, preventing the square rod 64 from sliding into the plug hole 69 due to vibration during the operation of the print head.

[0043] Furthermore, the limiting assembly 90 includes: a rotating column 91, which is rotatably arranged on the outer shell 11, and a circular hole is concentrically opened on the rotating column 91, and the control rod 81 is rotatably connected to the circular hole. A receiving groove 92 is opened at one end of the rotating column 91 adjacent to the outer shell 11, and an arc groove 93 connected to the receiving groove 92 is also arranged on the side of the rotating column 91 adjacent to the outer shell 11, and a limiting groove 94 is opened at one end of the arc groove 93 away from the receiving groove 92, and the limiting groove 94, the arc groove 93, and the receiving groove 92 are all connected to the circular hole; a limiting column 95, which is arranged on the control rod 81, and the limiting column 95 is placed in the receiving groove 92.

[0044] like Figure 1 , 4 As shown in FIGS. 10 and 11, when it is necessary to insert the end of the square rod 64 into the square hole 631, the control rod 81 is pressed to drive the sliding seat 80 and the square rod 64 to slide, so that the end of the square rod 64 is placed in the plug-in hole 69. During the movement of the sliding seat 80, the tension spring 82 is stretched. During the movement of the control rod 81, the limit column 95 slides in the arc groove 93 in the accommodating groove 92. At this time, the rotating column 91 is rotated to make the limit column 95 slide in the arc groove 93 to the limit groove 94, and the control rod 81 is released. The tension spring 82 loses its restriction, and the sliding seat 80 and the control rod 81 are pulled to move, so that the limit column 95 is stuck in the limit groove 94, and the position of the control rod 81 and the square rod 64 is restricted, so that the end of the square rod 64 remains inserted into the plug-in hole 69.

[0045] Furthermore, two fixing plates 15 are spaced apart on the nozzle body 10, two guide rods 16 are spaced apart between the two fixing plates 15, a connecting seat 25 is provided on the second driving motor 23, a guide hole is provided at the bottom of the connecting seat 25 corresponding to the guide rod 16, and the guide hole is slidably connected to the guide rod 16.

[0046] The two guide rods 16 are arranged in parallel and spaced apart, and two ends thereof are connected to the two fixing plates 15 respectively.

[0047] like Figure 7 As shown, the second drive motor 23 is slidably disposed on the guide rod 16 via a connecting seat 25 to ensure the sliding stability of the second drive motor 23 .

[0048] Furthermore, the sliding assembly 50 includes a threaded rod 51 rotatably disposed between the two fixing plates 15, the connecting seat 25 is screwed with the threaded rod 51 through a threaded hole, one end of the threaded rod 51 passes through one of the fixing plates 15 and the housing 11 and is provided with a screw handle 52

[0049] like Figure 7 As shown, the screwing handle 52 is rotated to drive the threaded rod 51 to rotate. Since the connecting seat 25 is screwed with the threaded rod 51 through the threaded hole, the threaded rod 51 rotates to drive the connecting seat 25 and the second driving motor 23 to move.

[0050] Working principle: When changing the wire, the first drive motor 21 and the second drive motor 23 first drive the first gear 22 and the second gear 24 to rotate, pushing the wire toward the feed tube 12, and then the staff will pull out the remaining wire from the upper end of the feed tube 12. Then, the screwing handle 52 is turned to drive the threaded rod 51 to rotate, driving the connecting seat 25, the second drive motor 23, and the second gear 24 to move, and avoid the cleaning column 37 that is about to rotate. Then, the control rod 81 is pushed to drive the limit column 95, the sliding seat 80, and the square rod 64 to move. The end of the square rod 64 is inserted into the plug hole 69, and then the rotating column 91 is rotated so that the limit column 95 is stuck in the limit groove 94, and then the first drive motor 21 is started to drive the first gear 22, the plug seat 68, and the square rod 64 to rotate, driving the active pulley 65, the driven pulley 66, the rotating shaft 45, and the active gear 46 to rotate, driving the rack 43 to descend, and then driving the top plate 41, the slide bar 32, the connecting plate 36, and the cleaning column 37 to descend. During the descending process of the slide bar 32, the spiral groove 33 cooperates with the guide rod 34, so that the slide bar 32 first rotates 180 degrees, so that the cleaning column 37 rotates to the top of the nozzle of the discharge pipe 13, and then the guide rod 34 slides from the spiral groove 33 into the straight groove 35, and the cleaning column 37 continues to descend and pokes into the discharge pipe 13, pushing part of the residual wire attached to the nozzle of the discharge pipe 13 into the discharge pipe 13. Then the first drive motor 21 drives the rack 43, the slide bar 32, and the cleaning column 37 to rise and reset. Then push the control rod 81, so that the limit column 95 leaves the limit slot 94, and then rotate the rotating column 91, the tension spring 82 releases the tension so that the limit column 95 slides into the receiving slot 92, and the square block 72 slides into the fixing hole 71, restricting the square rod 64 so that it cannot rotate, thereby fixing the position of the slide bar 32. Finally, turn the screw handle 52 to drive the threaded rod 51 to rotate, reset the second drive motor 23 and the second gear 24, poke the new wire into the feed pipe 12, and start the first drive motor 21 and the second drive motor 23, so that the wire is pushed into the discharge pipe 13.

[0051] In the present invention, unless otherwise clearly specified and limited, terms such as "install", "connect", "connect", and "fix" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection. There are many ways of detachable installation, for example, it can be through the method of plug-in and snap-fit, or through the method of bolt connection, etc.

[0052] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above invention, which fall within the scope of protection of the present invention.

Claims

1. A print head with a variable nozzle, characterized in that: include: A nozzle body (10); A shell (11), wherein the shell (11) is arranged on a nozzle body (10), a feed pipe (12) and a discharge pipe (13) are arranged on the nozzle body (10), and a heater (14) is arranged on the discharge pipe (13); A material supply assembly (20), the material supply assembly (20) being arranged on the nozzle body (10) and located between the material supply pipe (12) and the material discharge pipe (13); A mounting seat (31), the mounting seat (31) being arranged on the nozzle body (10), the mounting seat (31) being provided with a sliding hole vertically, a sliding rod (32) being slidably arranged in the sliding hole, a spiral groove (33) being provided on the lower outer wall of the sliding rod (32), a straight groove (35) being provided vertically on the upper outer wall of the sliding rod (32), the lower end of the straight groove (35) being connected to the upper end of the spiral groove (33); A guide rod (34), wherein the guide rod (34) is arranged on the mounting seat (31), one end of the guide rod (34) is placed in the spiral groove (33), and a connecting plate (36) is arranged at the bottom of the slide rod (32); A cleaning column (37), the cleaning column (37) being connected to an end of the bottom of the connecting plate (36) away from the sliding rod (32); It also includes a lifting component (40), which is arranged on the nozzle body (10) and is used to drive the sliding rod (32) to move up and down.

2. A print head with a variable nozzle according to claim 1, characterized in that: The feeding assembly (20) comprises: A first drive motor (21), wherein the first drive motor (21) is arranged on the nozzle body (10), and a first gear (22) is arranged on an output shaft of the first drive motor (21); A second drive motor (23), wherein the second drive motor (23) is horizontally slidably arranged on the nozzle body (10), and a sliding assembly (50) for driving the second drive motor (23) to slide is arranged on the nozzle body (10), and a second gear (24) is arranged on the output shaft of the second drive motor (23), and the second gear (24) and the first gear (22) are arranged horizontally with a spacing therebetween.

3. A print head with a variable nozzle according to claim 2, characterized in that: The lifting assembly (40) comprises: A top plate (41), the top plate (41) is rotatably arranged on the top of the slide rod (32), a slide groove (42) is arranged on the side of the mounting seat (31) adjacent to the first gear (22), a rack (43) is vertically slidably arranged in the slide groove (42), and the top of the rack (43) is connected to the top plate (41); A mounting column (44), the mounting column (44) being horizontally arranged on the nozzle body (10), a rotating shaft (45) arranged concentrically is rotatably arranged on the mounting column (44), a driving gear (46) is arranged on the rotating shaft (45), and the driving gear (46) is meshed with the rack (43); A rotating unit (60), wherein the rotating unit (60) is used to drive the rotating shaft (45) to rotate.

4. A print head with a variable nozzle according to claim 3, characterized in that: The rotating unit (60) comprises: A mounting plate (61), the mounting plate (61) being arranged on the nozzle body (10) and located below the first gear (22), the mounting plate (61) being provided with two vertically arranged vertical plates (62) at intervals, the vertical plates (62) being provided with a receiving hole which is arranged concentrically with the first gear (22), a rotating block (63) being rotatably arranged in the receiving hole, the rotating block (63) being provided with a square hole (631), a square rod (64) being slidably arranged in the two square holes (631), a driving pulley (65) being slidably sleeved on the rod body of the square rod (64) which is located between the two rotating blocks (63), a driven pulley (66) being provided on the rotating shaft (45), the driven pulley (66) being connected to the driving pulley (65) via a transmission belt (67); A plug-in seat (68) is coaxially arranged on the first gear (22), a plug-in hole (69) is horizontally opened on the plug-in seat (68), and one end of the square rod (64) adjacent to the plug-in seat (68) is in a frustum shape.

5. A print head with a variable nozzle according to claim 4, characterized in that: The mounting plate (61) is also provided with a vertical plate (70), and a square fixing hole (71) is provided on the vertical plate (70). A square block (72) is provided on the side of the square rod (64) away from the first gear (22), and the side of the square block (72) away from the first gear (22) is in a frustum shape.

6. A print head with a variable nozzle according to claim 5, characterized in that: A sliding seat (80) is slidably arranged on the mounting plate (61), a control rod (81) is rotatably arranged on the sliding seat (80), one end of the control rod (81) is connected to the square rod (64), and the other end passes through the shell (11), a tension spring (82) is arranged between the sliding seat (80) and the shell (11), one end of the tension spring (82) is connected to the sliding seat (80), and the other end is connected to the shell (11), and a limiting component (90) for limiting the position of the control rod (81) is also arranged on the shell (11).

7. A print head with a variable nozzle according to claim 6, characterized in that: The limiting component (90) comprises: A rotating column (91), the rotating column (91) is rotatably arranged on the housing (11), a circular hole is coaxially opened on the rotating column (91), the control rod (81) is rotatably connected to the circular hole, a receiving groove (92) is opened at one end of the rotating column (91) adjacent to the housing (11), an arc groove (93) connected to the receiving groove (92) is also opened at one side of the rotating column (91) adjacent to the housing (11), a limiting groove (94) is opened at one end of the arc groove (93) away from the receiving groove (92), and the limiting groove (94), the arc groove (93) and the receiving groove (92) are all connected to the circular hole; A limiting column (95), wherein the limiting column (95) is arranged on the control rod (81), and the limiting column (95) is placed in the containing groove (92).

8. A print head with a variable nozzle according to claim 2, characterized in that: Two fixing plates (15) are arranged at intervals on the nozzle body (10), two guide rods (16) are arranged at intervals between the two fixing plates (15), a connecting seat (25) is arranged on the second driving motor (23), a guide hole is opened at the bottom of the connecting seat (25) corresponding to the guide rod (16), and the guide hole is slidably connected to the guide rod (16).

9. A print head with a variable nozzle according to claim 8, characterized in that: The sliding assembly (50) comprises a threaded rod (51) rotatably arranged between two fixing plates (15); the connecting seat (25) is screwedly engaged with the threaded rod (51) via a threaded hole; one end of the threaded rod (51) passes through one of the fixing plates (15) and the housing (11) and is provided with a screwing handle (52).

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