Printing mechanism with multiple hot melting nozzles

Abstract

The invention provides a printing mechanism with multiple hot melting nozzles, which is provided with a fixed seat, a first motor is arranged in the fixed seat, the output of the first motor is matched with a rotating seat and drives the rotating seat to rotate, a printing head and a feeding mechanism are fixedly connected below and on the side wall of the rotating seat at equal angles, and the printing head comprises a cylinder; an electric heating cylinder is vertically arranged in the cylinder, a nozzle is fixedly connected to the lower end of the cylinder, a movable column is arranged in the electric heating cylinder, a big-end-down taper hole is formed in the middle of the movable column, a cavity is formed in the side wall of the upper portion of the cylinder, and a semiconductor chilling plate is arranged in the cavity; two rotating shafts arranged side by side are arranged on the bottom plate, rotating wheels are arranged on the rotating shafts, grooves are formed in the side walls of the rotating wheels, and elastic rings and feeding wheels are arranged in the grooves from inside to outside in a buckled mode. According to the multi-material 3D printer, the multiple printing heads meet the requirement for multi-material printing, and the feeding mechanism is suitable for conveying materials with various wire diameters.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a printing mechanism with multiple hot melt nozzles. Background Art

[0002] 3D printing (3DP), also known as additive manufacturing technology, is a technology that manufactures physical parts by adding materials layer by layer based on three-dimensional CAD data.

[0003] Existing 3D printed parts are basically printed using a single (composite) material. The materials of each part of the printed part are consistent, that is, the performance is also consistent. However, after the printed part is installed in the workstation, different parts of the printed part require different performance. Therefore, the selection of printing materials is relatively strict, and the cost of the materials is not low to meet multiple requirements. Or further processing is performed on the printed part to obtain the required performance in a specific part, which also increases the production cost. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a printing mechanism with multiple hot melt nozzles, including a fixed seat, the lower end of which is rotatably connected to a rotating seat, the lower edge of which is fixedly connected to a plurality of print heads at equal angles, and a feeding mechanism is arranged directly above each of the print heads. Multiple print heads are arranged, and each print head can be independently set with different printing materials to meet the needs of printing multiple materials at the same time for the same print piece, and the arrangement of the rotating seat is convenient for switching print heads.

[0005] The print head includes a cylinder, an electric heating cylinder is vertically arranged inside the cylinder, a plurality of coils are wound around the side wall of the electric heating cylinder, a nozzle is fixedly connected to the lower end of the cylinder, a feed hole is arranged at the upper end of the cylinder, and the feed hole is located directly above the preset through hole on the nozzle. After the printing material enters the cylinder from the feed, the coil is energized to generate heat, and the printing material is melted and sent out from the nozzle.

[0006] The electric heating cylinder is provided with a movable column inside, and a tapered hole with a small top and a large bottom is provided in the middle of the movable column. A spring is fixedly connected to the upper end of the movable column, and the upper end of the spring is against the upper part of the cylinder. The upper side wall of the cylinder is provided with a chamber, and a semiconductor cooling sheet is provided in the chamber. After the printing material passes downward from the upper end of the movable column, it begins to melt. If it is necessary to switch the print head, the coil located at the movable column is powered off, and the semiconductor cooling sheet is powered on, with the cooling side facing the movable column. At this time, the printing material inside the movable column solidifies, and then the feeding mechanism is activated to pull the printing material upward. At this time, the movable column moves upward and generates negative pressure at the bottom. At this time, the material at the nozzle is sucked back into the cylinder to avoid the problem of wire drawing in the current nozzle during the switching process of the printing material, which affects the printing quality.

[0007] The feeding mechanism comprises a bottom plate, two rotating shafts arranged side by side are arranged on the bottom plate, a rotating wheel is arranged on the rotating shaft, a groove is arranged on the side wall of the rotating wheel, and an elastic ring and a feeding wheel are arranged in the groove from inside to outside, a second motor is fixedly connected to the back of the bottom plate, and the output end of the second motor is fixedly connected to one of the rotating shafts. When the feeding mechanism is working, the printing material is clamped by the feeding wheel, and the elastic ring is deformed by force, and its reaction force ensures the stability of the clamping. At the same time, due to the setting of the elastic ring, printing materials of various diameters can be transported.

[0008] Preferably, a transfer circuit board is arranged in the upper chamber of the cylinder, and a cover is arranged on the front of the chamber, a plurality of heat sinks are arranged at equal intervals on the upper side wall of the cylinder, and a heat preservation sleeve is sleeved on the lower part of the cylinder. A wiring hole is arranged on the cover, and the semiconductor cooling sheet and the transfer circuit board are electrically connected, and a plurality of contacts are arranged on the other side of the transfer circuit board, the contacts penetrate the cylinder, and the contacts are in contact with the electrodes preset on the side wall of the electric heating tube, and the middle of the chamber is filled with silicone rubber.

[0009] Preferably, a front plate with a top view profile of "J" is riveted on the front of the bottom plate, and guide rods are arranged vertically and horizontally between the front plate and the bottom plate. The arrangement of the guide rods realizes the limit in the front left and right directions in the conveying structure of the printing material, ensuring that the printing material can be smoothly clamped by the feeding wheel.

[0010] Preferably, the side wall of the rotating seat is fixedly connected with a lower material guide mechanism, and the lower material guide mechanism is located directly above the corresponding feeding mechanism, the lower material guide mechanism includes a square box, the interior of the square box is rotatably connected with a first guide ring, and the front end of the first guide ring extends from the square box, two U-shaped elastic parts are arranged inside the square box, and the first guide ring is located between the two U-shaped elastic parts, and the front end of the square box is fixedly connected with a front stopper. The printing material passes through the first guide ring to ensure that the printing material can only enter from directly above the feeding mechanism, and the provision of the two U-shaped elastic parts ensures that the first guide ring can rotate left and right to avoid excessive stress on the printing material.

[0011] Preferably, the side wall of the fixed seat is fixedly connected with an upper material guide mechanism, the upper material guide mechanism includes a fixed sleeve, a support ring is sleeved on the fixed sleeve, a plurality of second guide rings are fixedly connected at equal angles on the support ring, and a threaded sleeve is threadedly connected to the upper part of the fixed sleeve. The second guide ring is used to initially limit the position of the printing material. Since the rotating seat and the fixed seat can rotate relative to each other, a lower material guide mechanism and an upper material guide mechanism are provided.

[0012] Preferably, the interior of the fixed seat is fixedly connected with a first motor, the output end of the first motor is fixedly connected with a coupling, the lower part of the coupling is a spline, the upper end of the rotating seat is fixedly connected with a first cover plate, the middle part of the first cover plate is provided with a matching hole, and the matching hole is matched with the spline. The first motor is started to drive the rotating seat to rotate, thereby realizing the switching of the print head.

[0013] Preferably, a slip ring is fixedly connected to the coupling. The use of the slip ring ensures power supply and communication below.

[0014] Preferably, the upper part of the rotating seat is sleeved with two plane bearings, and a connecting ring is arranged between the two plane bearings, the lower part of the fixed seat is sleeved on the outer side of the connecting ring, and a screw is inserted through the lower part of the fixed seat, and the screw and the connecting ring are threadedly matched. During assembly, the edge of the first cover plate is buckled on the top of the plane bearing, the connecting ring is between the two plane bearings, and the connecting ring is fixedly connected to the fixed seat, ensuring the stability of the rotation between the fixed seat and the rotating seat.

[0015] Preferably, the upper ends of the rotating seat and the fixed seat are both provided with an electrical chamber, and the upper end of the fixed seat is fixedly connected with a second cover plate. The electrical chamber is used to accommodate the control module.

[0016] The beneficial effects of the present invention are as follows: 1. Multiple print heads are provided, each of which is equipped with different printing materials. Different printing materials can be used in different parts according to the application requirements of the workpiece, which reduces the cost of printing materials and subsequent processing costs as a whole.

[0017] 2. A semiconductor refrigeration sheet and an electric heating tube are provided. At the same time, a movable column is provided inside the electric heating tube. The inside of the movable column is a tapered hole that is small at the top and large at the bottom. When the print head needs to be switched, the coil at the movable column is powered off and the semiconductor refrigeration sheet is powered on. The cooling side faces the movable column. At this time, the printing material inside the movable column is solidified, and then the feeding mechanism is activated to pull the printing material upward. At this time, the movable column moves upward and generates negative pressure at the bottom. At this time, the material at the nozzle is sucked back into the cylinder to avoid the problem of wire drawing of the current nozzle during the switching process of the printing material, which affects the printing quality.

[0018] 3. The feeding mechanism includes a rotating wheel, an elastic ring and a feeding wheel. The printing material is clamped by the feeding wheel, and the elastic ring is deformed by force. Its reaction force ensures the stability of the clamping. At the same time, due to the setting of the elastic ring, printing materials of various diameters can be transported, and the tight clamping meets the needs of high-precision feeding and the pulling action needs to solve the wire drawing problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional schematic diagram of the present invention; Figure 2 It is an exploded schematic diagram of the main structure of the present invention; Figure 3 It is a structural schematic diagram of the coupling of the present invention; Figure 4 for Figure 2 The enlarged schematic diagram of point A in the middle; Figure 5 is a schematic cross-sectional view of a print head of the present invention; Figure 6 is an exploded schematic diagram of a print head of the present invention; Figure 7 It is a cross-sectional schematic diagram of the electric heating cartridge of the present invention; Figure 8 It is an exploded schematic diagram of the feeding mechanism of the present invention; Fig. 9 It is an exploded schematic diagram of the lower material guiding mechanism of the present invention; Fig.10 It is an exploded schematic diagram of the upper material guiding mechanism of the present invention.

[0020] List of reference numerals: 1. Print head; 2. Feeding mechanism; 3. Lower material guiding mechanism; 4. Rotating seat; 5. Fixed seat; 6. Upper material guiding mechanism; 7. Coupling; 8. First cover plate; 9. First motor; 10. Second cover plate; 11. Spline; 12. Slip ring; 13. Plane bearing; 14. Connecting ring; 101. nozzle; 102. insulation sleeve; 103. cylinder; 104. movable column; 105. heat sink; 106. spring; 107. cover; 108. semiconductor refrigeration sheet; 109. adapter circuit board; 1010. electric heating tube; 1011. coil; 201. front plate; 202. guide rod; 203. rotating wheel; 204. elastic ring; 205. feeding wheel; 206. rotating shaft; 207. bottom plate; 208. second motor; 301. first guide ring; 302. front stopper; 303. square box; 304. U-shaped elastic member; 601. fixing sleeve; 602. second guide ring; 603. supporting ring; 604. threaded sleeve. DETAILED DESCRIPTION

[0021] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] Figures 1 to 10As shown, a printing mechanism with multiple hot melt nozzles includes a fixed base 5, the lower part of the fixed base 5 is a cylindrical pipe, the upper end is a rectangular plate with rounded corners, and the four corners of the rectangular plate are provided with mounting holes, the lower end of the fixed base 5 is rotatably connected to a rotating base 4, the rotating base 4 is also cylindrical, and the lower end edge of the rotating base 4 is fixedly connected with a plurality of print heads 1 at equal angles, and the plurality of print heads 1 can realize that a single printing mechanism can print a variety of materials, and at the same time, different parts on a single workpiece can realize different printing material requirements, and a feeding mechanism 2 is provided directly above each print head 1, and the feeding mechanism 2 is used to feed the printing material into the print head 1.

[0023] The print head 1 includes a cylinder 103, the upper end of the cylinder 103 is a connecting plate, and a mounting hole is provided on the connecting plate, which is convenient for fixed connection with the lower end of the rotating seat 4. An electric heating tube 1010 is vertically arranged inside the cylinder 103, and the electric heating tube 1010 is sleeved inside the cylinder 103 to facilitate its removal. A number of coils 1011 are wound around the side wall of the electric heating tube 1010. It should be noted that each coil is independently controlled to achieve different temperatures at different heights of the cylinder 103. The lower end of the cylinder 103 is fixedly connected to a nozzle 101, and the nozzle 101 delivers the molten printing material. A feed hole is provided at the upper end of the cylinder 103, and the feed hole is located directly above the preset through hole on the nozzle 101. The printing material enters the interior of the cylinder 103 from the feed hole, and the upper edge of the feed hole is provided with a rounded corner. In addition, the printing material is pushed into the interior of the cylinder 103 by the feeding mechanism 2.

[0024] An active column 104 is provided inside the electric heating tube 1010. The active column 104 is located in the middle of the electric heating tube 1010, and a tapered hole with a small upper part and a large lower part is provided in the middle of the active column 104. A spring 106 is fixedly connected to the upper end of the active column 104, and the upper end of the spring 106 is against the upper part of the cylinder 103. Under the suspension of the spring 106, the position of the active column 104 is maintained, and the pressure change of the melting of the printing material can also be balanced. A chamber is provided on the upper side wall of the cylinder 103, and a semiconductor refrigeration sheet 108 is provided in the chamber. The cooling side of the semiconductor refrigeration sheet 108 faces the active column 104. When power is turned on, the printing material located in the active column 104 is cooled and solidified.

[0025] Furthermore, when the print head 1 is switched, the coil 1011 at the active column 104 is de-energized, and then the semiconductor refrigeration plate 108 is energized, and the printing material at the active column 104 is cooled and solidified. At this time, the feeding mechanism 2 lifts the printing material, and the solidified printing material also lifts the active column 104 under the tapered hole structure, so that negative pressure is generated below, and the material at the nozzle 101 is sucked back, reducing the problem of wire drawing of the printing material and reducing the quality of the print.

[0026] The feeding mechanism 2 includes a bottom plate 207, which is fixedly connected to the rotating seat 4 by screws and bolts. Two parallel rotating shafts 206 are arranged on the bottom plate 207, and a rotating wheel 203 is arranged on the rotating shaft 206. The side wall of the rotating wheel 203 is provided with a groove, and an elastic ring 204 and a feeding wheel 205 are buckled from the inside to the outside in the groove. The printing material passes through the feeding wheel 205. Furthermore, the side wall of the feeding wheel 205 is provided with an arc groove, and the arc groove is provided with a convex pattern to prevent slipping and ensure that the printing material The material is held tightly. After the printing material passes through the two feeding wheels 205, the force generated by the deformation of the elastic ring 204 ensures that the feeding wheel 205 is clamped stably. The setting of the elastic ring 204 can convey printing materials of various diameters. The back of the bottom plate 207 is fixedly connected with a second motor 208. The output end of the second motor 208 is fixedly connected to one of the rotating shafts 206. The second motor 208 is started to drive the feeding wheel 205 to rotate to realize the conveying of materials. Due to the tight clamping, the conveying amount can be determined and the printing speed can be set.

[0027] A transfer circuit board 109 is arranged in the upper chamber of the cylinder 103, and a plurality of contacts are arranged on the back of the transfer circuit board 109. At the same time, an electrode is arranged on the upper side wall of the electric heating tube 1010, and the electrode is electrically connected to the coil 1011. When the electric heating tube 1010 is assembled inside the cylinder 103, the contacts and the electrodes are in contact with each other to supply power to the coil. At the same time, the semiconductor cooling sheet 108 is also electrically connected to the transfer circuit board 109. At the same time, the semiconductor cooling sheet 108 The cooling side is attached to the adapter circuit board 109, and a cover 107 is provided on the front of the chamber to seal the chamber. At the same time, silicone rubber is filled inside the chamber to seal the gap therein. A number of heat sinks 105 are equidistantly provided on the upper side wall of the cylinder 103. The setting of the heat sink 105 improves the heat dissipation capacity of the upper part of the cylinder 103. The lower part of the cylinder 103 is sleeved with an insulation sleeve 102. The use of the insulation sleeve 102 reduces the heat dissipation speed of the cylinder 103.

[0028] The front side of the bottom plate 207 is riveted with a front plate 201 having a "J"-shaped profile when viewed from above. Both the bottom plate 207 and the wall plate 201 are sheet metal parts with a relatively small thickness, and riveting is more conducive to the connection between the two. Guide rods 202 are vertically and horizontally arranged between the front plate 201 and the bottom plate 207. Specifically, three guide rods 202 are arranged, two of which are located on both sides above the feed wheel 205, and the other is located at the front end above the feed wheel 205, thereby realizing the front and left and right guidance of the printing material.

[0029] The side wall of the rotating seat 4 is fixedly connected with a lower material guide mechanism 3, and the lower material guide mechanism 3 is located directly above the corresponding feeding mechanism 2. The lower material guide mechanism 3 includes a square box 303, the interior of the square box 303 is rotatably connected with a first guide ring 301, and the front end of the first guide ring 301 extends from the square box 303. The front end of the first guide ring 301 is a circular ring, and the printing material passes through the circular ring. Two U-shaped elastic members 304 are arranged inside the square box 303, and the first guide ring 301 is located The first guide ring 301 is centrally arranged between the two U-shaped springs 304, that is, under the action of the two U-shaped springs 304. At the same time, under the restriction of the U-shaped kit, the first guide ring 301 can swing left and right. The front end of the square box 303 is fixedly connected with a front stopper 302, and the front stopper 302 blocks the square box 303. At the same time, a protruding rod is arranged on the front stopper 302, and the protruding rod extends to the interior of the square box 303. In addition, a fixing pin is arranged, which vertically passes through the protruding rod and the square box 303.

[0030] The side wall of the fixed seat 5 is fixedly connected with an upper material guiding mechanism 6, and the upper material guiding mechanism 6 includes a fixed sleeve 601. The cross-section of one side of the fixed sleeve 601 is L-shaped, which is used to receive the structure above. At the same time, a number of screws are inserted on the fixed sleeve 601 to fix the fixed sleeve 601 to the fixed seat 5. A support ring 603 is sleeved on the fixed sleeve 601, and a number of second guide rings 602 are fixedly connected at equal angles on the support ring 603. The second guide ring 602 has the same structure as the first guide ring 301. The upper part of the fixed sleeve 601 is threadedly connected with a threaded sleeve 604, and the threaded sleeve 604 limits the upper and lower positions of the support ring 603. According to the usage scenario, the threaded sleeve 604 can be loosened to switch the support ring 603 between rotation or fixation.

[0031] Since the fixed seat 5 and the rotating seat 4 are provided, an upper material guiding mechanism 6 and a lower material guiding mechanism 3 are provided to meet the use requirements of the printing mechanism.

[0032] The interior of the fixed seat 5 is fixedly connected to a first motor 9, which is fixedly connected to a partition preset inside the fixed seat 5 by screws. The output end of the first motor 9 is fixedly connected to a coupling 7, and the lower part of the coupling 7 is a spline 11. The upper end of the rotating seat 4 is fixedly connected to a first cover plate 8, and a matching hole is provided in the middle part of the first cover plate 8, which matches with the spline 11, that is, the first motor 9 is started by plugging and connecting the spline 11, thereby driving the rotating seat 4 to rotate.

[0033] The coupling 7 is fixedly connected to a slip ring 12. The slip ring 12 provides power supply and communication for the lower part. The coupling 7 is hollow, and the line on one side of the slip ring 12 passes through the coupling 7 and enters the rotating seat 4 below. In addition, a wire groove is provided on the inner wall of the fixed seat 5, and the cable passes through the wire groove and is electrically connected to the coupling 7.

[0034] Two plane bearings 13 are sleeved on the upper part of the rotating seat 4, and a connecting ring 14 is arranged between the two plane bearings 13, that is, the connecting ring 14 can rotate arbitrarily on the two plane bearings 13, the lower part of the fixed seat 5 is sleeved on the outer side of the connecting ring 14, and screws are inserted into the lower part of the fixed seat 5, and the screws and the connecting ring 14 are threadedly matched. Furthermore, when the first cover plate 8 is fixed, its edge is buckled against the plane bearing 13 to achieve the upper and lower position limitation, and after the connecting ring 14 and the fixed seat 5 are fixedly connected, there is no upper and lower movable gap between the rotating seat 4 and the fixed seat 5.

[0035] The upper ends of the rotating seat 4 and the fixed seat 5 are both provided with electrical chambers, in which power supply circuits and drive motors are provided. For example, the electrical chamber on the fixed seat 5 is provided with a communication node for communication with the host computer and the control circuit of the first motor 9, etc. The rotating seat 4 is provided with a control circuit for the second motor 208, the semiconductor cooling plate 108, and the coil 1011. The upper end of the fixed seat 5 is fixedly connected with a second cover plate 10, which blocks the electrical chamber. At the same time, a connecting structure is provided at the edge of the second cover plate 10, and screws are provided on the side walls of the fixed seat 5 and are threadedly connected to the connecting structure.

[0036] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A printing mechanism with multiple hot melt nozzles, characterized in that: It comprises a fixed seat (5), the lower end of the fixed seat (5) is rotatably connected to a rotating seat (4), the lower end edge of the rotating seat (4) is fixedly connected to a plurality of print heads (1) at equal angles, and a feeding mechanism (2) is arranged directly above each of the print heads (1); The print head (1) comprises a cylinder (103), an electric heating cylinder (1010) is vertically arranged inside the cylinder (103), a plurality of coils (1011) are wound around the side wall of the electric heating cylinder (1010), a nozzle (101) is fixedly connected to the lower end of the cylinder (103), a feed hole is arranged at the upper end of the cylinder (103), and the feed hole is located directly above a preset through hole on the nozzle (101); A movable column (104) is arranged inside the electric heating tube (1010), and a tapered hole with a smaller top and a larger bottom is arranged in the middle of the movable column (104); a spring (106) is fixedly connected to the upper end of the movable column (104), and the upper end of the spring (106) abuts against the upper part of the cylinder (103); a chamber is arranged on the upper side wall of the cylinder (103), and a semiconductor cooling plate (108) is arranged in the chamber; The feeding mechanism (2) comprises a bottom plate (207), two rotating shafts (206) arranged side by side are arranged on the bottom plate (207), a rotating wheel (203) is arranged on the rotating shaft (206), a groove is arranged on the side wall of the rotating wheel (203), and an elastic ring (204) and a feeding wheel (205) are arranged in the groove from the inside to the outside, and a second motor (208) is fixedly connected to the back of the bottom plate (207), and the output end of the second motor (208) is fixedly connected to one of the rotating shafts (206).

2. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: A switching circuit board (109) is arranged in the upper chamber of the cylinder (103), and a cover (107) is arranged on the front of the chamber. A plurality of heat sinks (105) are arranged at equal intervals on the upper side wall of the cylinder (103), and a heat preservation sleeve (102) is sleeved on the lower part of the cylinder (103).

3. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: A front plate (201) having a "J"-shaped outline when viewed from above is riveted onto the front side of the bottom plate (207), and guide rods (202) are arranged vertically and horizontally between the front plate (201) and the bottom plate (207).

4. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: The side wall of the rotating seat (4) is fixedly connected to a lower material guiding mechanism (3), and the lower material guiding mechanism (3) is located directly above the corresponding feeding mechanism (2). The lower material guiding mechanism (3) comprises a square box (303), the interior of the square box (303) is rotatably connected to a first guide ring (301), and the front end of the first guide ring (301) extends from the square box (303). Two U-shaped elastic members (304) are arranged inside the square box (303), and the first guide ring (301) is located between the two U-shaped elastic members (304). The front end of the square box (303) is fixedly connected to a front stopper (302).

5. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: An upper material guide mechanism (6) is fixedly connected to the side wall of the fixed seat (5), the upper material guide mechanism (6) comprising a fixed sleeve (601), a support ring (603) is sleeved on the fixed sleeve (601), a plurality of second guide rings (602) are fixedly connected at equal angles on the support ring (603), and a threaded sleeve (604) is threadedly connected to the upper portion of the fixed sleeve (601).

6. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: A first motor (9) is fixedly connected to the interior of the fixed seat (5); an output end of the first motor (9) is fixedly connected to a coupling member (7); a lower portion of the coupling member (7) is a spline (11); an upper end of the rotating seat (4) is fixedly connected to a first cover plate (8); a matching hole is provided in the middle of the first cover plate (8) and matches the spline (11).

7. A printing mechanism with multiple hot melt nozzles according to claim 6, characterized in that: A slip ring (12) is fixedly connected to the coupling (7).

8. The printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: The upper portion of the rotating seat (4) is sleeved with two plane bearings (13), and a connecting ring (14) is provided between the two plane bearings (13); the lower portion of the fixed seat (5) is sleeved on the outer side of the connecting ring (14), and a screw is inserted through the lower portion of the fixed seat (5), and the screw and the connecting ring (14) are threadedly matched.

9. A printing mechanism with multiple hot melt nozzles according to claim 1, characterized in that: The upper ends of the rotating seat (4) and the fixed seat (5) are both provided with an electrical chamber, and the upper end of the fixed seat (5) is fixedly connected to a second cover plate (10).

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