Printing head convenient to adjust position and used for building 3D printing equipment

Abstract

The invention relates to the technical field of building 3D printing equipment, in particular to a position-conveniently-adjusted printing head for building 3D printing equipment, which comprises a concave frame, a spherical seat is arranged at the lower end of the inner side of the concave frame, a part of the upper end of the spherical seat is horizontally cut off to form a plane, and the lower end of the spherical seat is upwards sunken to form a fan-shaped rotating groove; a fan-shaped rotating groove is formed in the lower end of the spherical seat, a rectangular groove is formed in the upper end of the fan-shaped rotating groove in a downward penetrating mode, circular shafts are fixedly connected to the side face of the spherical seat in a bilateral symmetry mode, and the circular shafts are rotationally connected with two side plates of the concave frame. A concrete material penetrates through an inner cavity of the communicating box and flows in along one end of the discharging channel, the concrete material penetrates through the discharging hole and then flows into the material guiding pipeline along the other end of the discharging channel, and the concrete material flows into the printing spray head body along the material guiding pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of building 3D printing equipment, and particularly to a print head for a building 3D printing equipment that is convenient for adjusting the position. Background Art

[0002] 3D printing, also known as additive manufacturing technology, is a technology for manufacturing solid parts by the method of layer-by-layer material accumulation based on three-dimensional CAD data. At present, the application of 3D printing technology in the construction field is still in its infancy, mainly because the strength and seismic resistance of the buildings printed by it are limited. Therefore, applying 3D printing technology to small building components is the future trend.

[0003] There are certain defects in the existing building 3D printing equipment during use. Since the degree of freedom of the print head of the building 3D printing equipment is average, the print nozzle can only perform printing operations in the vertical direction. When printing cantilever, arch or special-shaped structures, it is necessary to tilt the print head to avoid material sagging or collapse and improve the forming accuracy of the cantilever part. However, the print head of the existing building 3D printing equipment cannot well meet some inclined printing needs, and it often needs to replace with a special printing equipment, which not only increases the printing time but also greatly increases the construction cost, and is not conducive to actual use. Summary of the Invention

[0004] The purpose of the present invention is to provide a print head for a building 3D printing equipment that is convenient for adjusting the position, so as to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A print head for a building 3D printing equipment that is convenient for adjusting the position, including a concave frame. A spherical seat is arranged at the lower end inside the concave frame. A part of the upper end of the spherical seat is horizontally cut off to form a plane. A sector-shaped rotating groove is recessed upward at the lower end of the spherical seat. A rectangular groove is penetrated downward from the upper end of the sector-shaped rotating groove. Circular shafts are symmetrically and fixedly connected to the left and right sides of the spherical seat, and the circular shafts are rotationally connected to the two side plates of the concave frame. One of the circular shafts is driven by the motor shaft of a first stepping motor fixedly installed on the outer side of the concave frame; An ax-shaped gear is installed in the rectangular groove. A rotating arm is fixedly connected to the lower end of the ax-shaped gear. The lower end of the rotating arm penetrates downward through the sector-shaped rotating groove and extends to the outside. The ax-shaped gear is driven by the output shaft of a second stepping motor fixedly installed in the spherical seat; The lower end of the rotating arm is fixedly connected to a communication box. The feeding end of the communication box is connected to a feeding hose through a joint, and the side of the communication box is connected to a print nozzle body.

[0006] As a further solution of the present invention, the rotating arm is slidably connected to the sector-shaped rotating groove. Arc-shaped guiding grooves are symmetrically formed on the front and rear inner side walls of the sector-shaped rotating groove. Sector-shaped blocks are symmetrically and fixedly connected to the front and rear sides of the rotating arm, and the sector-shaped blocks are slidably connected to the arc-shaped guiding grooves.

[0007] As a further solution of the present invention, annular fixed crown gears are symmetrically and fixedly connected to the lower ends of the two inner side walls of the concave-shaped frame. The two annular fixed crown gears are respectively sleeved on the outer sides of the two circular shafts. The circular shafts can rotate along the inner sides of the annular fixed crown gears, and locking mechanisms are symmetrically sleeved on the two circular shafts; An unlocking mechanism is installed at the upper end of the spherical seat between the two locking mechanisms. A locking tooth block is fixedly connected to the lower end of the unlocking mechanism, and the lower end of the locking tooth block extends into the rectangular groove and is clamped with the ax-shaped gear.

[0008] As a further solution of the present invention, sliding grooves are symmetrically formed on the side surface of the circular shaft. The locking mechanism includes an annular rotating crown gear slidably sleeved on the circular shaft. Sliders are symmetrically and fixedly connected to the inner side of the annular rotating crown gear. The sliders are slidably connected to the sliding grooves on the left and right of the circular shaft. A locking spring is sleeved on the circular shaft. The upper end of the cylindrical surface of the annular rotating crown gear is fixedly connected with an L-shaped transmission plate, and an extrusion groove is formed through the upper end of the L-shaped transmission plate from top to bottom.

[0009] As a further solution of the present invention, the two ends of the locking spring respectively abut against the spherical seat and the annular rotating crown gear, and the teeth of the annular rotating crown gear are clamped with the teeth of the annular fixed crown gear.

[0010] As a further solution of the present invention, the unlocking mechanism includes an L-shaped support seat fixedly connected to the upper end of the spherical seat. An electric push rod is fixedly connected to the upper end of the L-shaped support seat. The lower end of the inner rod of the electric push rod penetrates downward through the upper end of the L-shaped support seat and is fixedly connected with a concave-shaped plate. The upper ends of the two side plates of the concave-shaped plate penetrate upward through the extrusion groove, and the inner side wall of the concave-shaped plate is in sliding contact with one side of the extrusion groove from top to bottom. Extrusion blocks are fixedly connected to the lower ends of the two inner side walls of the concave-shaped plate. An extrusion inclined surface is formed at the upper end of the extrusion block. The lower end of the concave-shaped plate is fixedly connected with the upper end of the locking tooth block.

[0011] As a further solution of the present invention, one side of the communication box is open. A sealing side plate is fixedly installed on the side of the communication box where the opening is provided. A plurality of extension seats are equidistantly inserted and penetrated through the side surface of the sealing side plate. A discharge channel is formed through one end of the extension seat from outside to inside. An internal thread sleeve is fixedly connected to the end of the extension seat close to the outside. A material guiding pipe is fixedly inserted into the side surface of the printing head main body. One end of the material guiding pipe is threadedly connected with the internal thread sleeve. Switch adjusting mechanisms are installed in all the plurality of extension seats.

[0012] As a further solution of the present invention, a spherical groove is provided inside the discharge channel on the extension base. The switch adjustment mechanism includes a spherical valve rotatably installed in the spherical groove. Symmetrically fixed connections are provided at the upper and lower ends of the spherical valve with rotating shafts. The spherical valve is rotatably connected to the extension base through the rotating shafts. A discharge hole is provided through the side of the spherical valve. The upper end of the rotating shaft at the top of the spherical valve sequentially passes upward through the extension base and the communication box. The upper end of the rotating shaft at the top of the spherical valve is fixedly connected with a polygonal rod, and a limiting mechanism is installed on the top of the communication box on the polygonal rod.

[0013] As a further solution of the present invention, the limiting mechanism includes an upper top plate, a lower pressing spring and an adjusting block sleeved on the polygonal rod in sequence from top to bottom. The upper top plate is fixedly connected to the upper end of the polygonal rod. The adjusting block is slidably connected to the polygonal rod up and down. The lower end of the adjusting block contacts the upper end of the communication box. The upper and lower ends of the lower pressing spring respectively abut against the upper top plate and the adjusting block. The lower pressing spring applies an elastic force to the adjusting block. An L-shaped clamping seat is fixedly connected to the side of the adjusting block, and an adjusting ring is fixedly sleeved on the outer side of the upper end of the adjusting block; A plurality of annular seats and a plurality of positioning seats are fixedly connected to the upper end of the communication box at equal intervals. The plurality of annular seats and the plurality of positioning seats are alternately distributed. Each annular seat is respectively sleeved on the outer side of an adjusting block. Two limiting grooves are provided at the upper end of the annular seat, and a positioning groove is provided at the upper end of the positioning seat.

[0014] The upper end of the material guiding pipe is fixedly connected with a docking block, and a clamping groove is provided at the upper end of the docking block.

[0015] The beneficial effects of the present invention are: 1. During the printing operation, the concrete pump feeds the concrete material into the inner cavity of the communication box through the feeding hose. The concrete material flows into the inner cavity of the communication box and then into one end of the discharge channel. The concrete material passes through the discharge hole and then flows into the material guiding pipe at the other end of the discharge channel. The concrete material flows along the material guiding pipe into the main body of the printing nozzle, and finally the concrete material flows out from the lower end of the main body of the printing nozzle, so as to perform the printing operation.

[0016] 2. When it is necessary to add a print head body, one end of the material guiding pipe on the side of the new print head body is screwed into the internal thread sleeve, so that the discharge hole on the side of the spherical valve communicates with the discharge channel; the docking block of the L-shaped clamping seat in the limiting mechanism is locked, so that the print head body and the connecting box can maintain relative fixation, and the print head body can perform printing operations stably; when it is necessary to reduce the print head body, one end of the L-shaped clamping seat is rotated from above the docking block to above the positioning seat, and the lower end of the L-shaped clamping seat is clamped with the positioning groove. At this time, the discharge hole on the side of the spherical valve is completely staggered from the discharge channel, so as to close the discharge channel, and at the same time, the L-shaped clamping seat releases the lock on the docking block; at this time, the material guiding pipe is unscrewed from the internal thread sleeve, so as to disassemble the material guiding pipe and the print head body; during use, the number of print head bodies on the side of the connecting box can be increased or decreased according to needs, so that the width of the printing range can be adjusted, and at the same time, the printing speed of the concrete material can be increased, thereby improving work efficiency; the disassembly and installation of the print head body are simple and convenient, which is convenient for the staff to operate.

[0017] 3. The motor shaft of the first stepping motor rotates forward or backward to drive the round shaft to rotate. The spherical seat drives the rotating arm to rotate forward or backward. The rotating arm drives the print head body to rotate forward or backward through the connecting box, realizing the front and rear inclination adjustment of the print head body; the output shaft of the second stepping motor rotates forward or backward to drive the ax-shaped gear to rotate. The ax-shaped gear drives the connecting box to rotate left or right through the rotating arm, and the connecting box drives the print head body to rotate left or right, realizing the left and right inclination adjustment of the print head body; through the cooperation of the first stepping motor and the second stepping motor, the rotating arm can rotate obliquely in multiple directions, so that the print head body can be inclined in multiple directions, and then the print head body can adapt to the printing requirements of different scenarios.

[0018] 4. Through the set unlocking mechanism, when it is necessary to adjust the inclination angle of the print head body, the unlocking mechanism moves upward, so that the locking mechanism releases the lock on the round shaft, and at the same time, the locking tooth block releases the lock on the ax-shaped gear. At this time, the inclination angle of the print head body can be adjusted according to needs; after the adjustment is completed, the unlocking mechanism resets downward, so that the locking mechanism locks the round shaft, and the locking tooth block locks the ax-shaped gear. At this time, the print head body cannot be inclined and adjusted, and then the print head body can perform printing operations stably and accurately. Description of the Drawings

[0019] Figure 1 is a three-dimensional view of the print head structure for a building 3D printing device with easy position adjustment according to the present invention; Figure 2 is a side sectional view of the print head structure for a building 3D printing device with easy position adjustment according to the present invention; Figure 3 Cross-sectional view of the concave frame, spherical seat and locking mechanism structure of the present invention; Figure 4 is Figure 3 Schematic enlarged view of the structure at position A in Figure 5 Exploded view of the concave frame, spherical seat, rotating arm, locking mechanism and unlocking mechanism structure of the present invention; Figure 6 Cross-sectional view of the communication box and extension seat structure of the present invention; Figure 7 Side-sectional view of the communication box, extension seat and material guiding pipe structure of the present invention; Figure 8 Exploded view of the communication box, extension seat, material guiding pipe, switch adjustment mechanism and limit mechanism structure of the present invention.

[0020] In the figure: 1, concave frame; 11, annular fixed crown gear; 2, spherical seat; 21, fan-shaped rotating groove; 22, rectangular groove; 23, arc-shaped guiding groove; 24, L-shaped support seat; 25, round shaft; 26, sliding groove; 3, rotating arm; 31, fan-shaped block; 32, ax-shaped gear; 33, annular rotating crown gear; 34, slider; 35, locking spring; 36, L-shaped transmission plate; 37, extrusion groove; 4, electric push rod; 41, concave plate; 42, locking tooth block; 43, extrusion block; 5, communication box; 51, annular seat; 52, limit groove; 53, positioning seat; 54, feed hose; 6, sealing side plate; 61, extension seat; 62, spherical groove; 63, internal thread sleeve; 7, printing head body; 71, material guiding pipe; 72, docking block; 73, card slot; 8, spherical valve; 81, discharge hole; 82, polygonal rod; 83, adjusting block; 84, downward pressure spring; 85, upper top plate; 86, L-shaped card seat. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1 to 8, the present invention provides a technical solution: a print head for a building 3D printing device that is convenient for adjusting the position, including a concave frame 1. At the lower end inside the concave frame 1, there is a spherical seat 2. A part of the upper end of the spherical seat 2 is horizontally cut off to form a plane. An upward concave fan-shaped rotating groove 21 is provided at the lower end of the spherical seat 2. A rectangular groove 22 is vertically penetrated upward from the upper end of the fan-shaped rotating groove 21. On the left and right sides of the spherical seat 2, there are symmetrically fixedly connected circular shafts 25. The circular shafts 25 are rotationally connected to the two side plates of the concave frame 1. One of the circular shafts 25 is driven by the motor shaft of a first stepping motor fixedly installed on the outer side surface of the concave frame 1; The two ends of the two circular shafts 25 away from the spherical seat 2 respectively penetrate through the two side plates of the concave frame 1. At the ends of the circular shafts 25 away from the spherical seat 2, there are fixedly sleeved with limit rings. Both the circular shafts 25 and the limit rings are rotationally connected to the side plates of the concave frame 1; By providing the two limit rings, the circular shafts 25 and the spherical seat 2 can rotate stably; The motor shaft of the first stepping motor and the circular shaft 25 are connected by a shrink disc or a clamping coupling, etc.; An ax-shaped gear 32 is installed in the rectangular groove 22. The lower end of the ax-shaped gear 32 is fixedly connected with a rotating arm 3. The lower end of the rotating arm 3 vertically penetrates through the fan-shaped rotating groove 21 and extends to the outside. The ax-shaped gear 32 is driven by the output shaft of a second stepping motor fixedly installed in the spherical seat 2. An installation groove is provided on the side surface of the spherical seat 2. The second stepping motor is fixedly installed in the installation groove. The output shaft of the second stepping motor is connected by key connection, flange connection, screw connection, or coupling, etc.; The lower end of the rotating arm 3 is fixedly connected with a communicating box 5. The feeding end of the communicating box 5 is connected with a feeding hose 54 through a joint. One end of the feeding hose 54 is connected with the discharging end of a concrete pump. The feeding end of the concrete pump is connected with a concrete material storage tank through a conveying pipeline. The concrete material is sent into the inner cavity of the communicating box 5 through the feeding hose 54 by the concrete pump. A print head main body 7 is connected to the side surface of the communicating box 5.

[0023] By the forward or reverse rotation of the motor shaft of the first stepping motor to drive the circular shaft 25 to rotate, the circular shaft 25 drives the rotating arm 3 to rotate forward or backward through the spherical seat 2. The rotating arm 3 drives the communicating box 5 to rotate forward or backward. The communicating box 5 drives the print head main body 7 to rotate forward or backward, thereby adjusting the tilting angle of the print head main body 7 and realizing the front and back tilting adjustment of the print head main body 7.

[0024] Please refer to Figure 2 and Figure 5 , the rotating arm 3 is slidably connected with the fan-shaped rotating groove 21. Arc-shaped guiding grooves 23 are symmetrically provided on the front and back inner side walls of the fan-shaped rotating groove 21. Sector-shaped blocks 31 are symmetrically fixedly connected to the front and back sides of the rotating arm 3. The sector-shaped blocks 31 are slidably connected with the arc-shaped guiding grooves 23.

[0025] The output shaft of the second stepping motor rotates forward or backward to drive the ax-shaped gear 32 to rotate. The ax-shaped gear 32 drives the rotating arm 3 to rotate left or right along the fan-shaped rotating groove 21. The rotating arm 3 drives the fan-shaped block 31 to slide along the arc-shaped guiding groove 23, so that the rotating arm 3 can rotate stably; The rotating arm 3 drives the connecting box 5 to rotate left or right. The connecting box 5 drives the printing head body 7 to rotate left or right, so as to adjust the tilting angle of the printing head body 7 and realize the left and right tilting adjustment of the printing head body 7.

[0026] Through the cooperation of the first stepping motor and the second stepping motor, the rotating arm 3 can tilt and rotate in multiple directions, so that the printing head body 7 can tilt in multiple directions, and further enable the printing head body 7 to adapt to the printing requirements of different scenarios.

[0027] Please refer to Figures 2 to 5 , at the lower ends of the two inner side walls of the concave-shaped frame 1, annular fixed crown gears 11 are symmetrically and fixedly connected. The two annular fixed crown gears 11 are respectively sleeved on the outer sides of the two round shafts 25. The round shafts 25 can rotate along the inner sides of the annular fixed crown gears 11. Locking mechanisms are symmetrically sleeved on the two round shafts 25; An unlocking mechanism is installed at the upper end of the spherical seat 2 between the two locking mechanisms. The lower end of the unlocking mechanism is fixedly connected with a locking tooth block 42. The lower end of the locking tooth block 42 extends into the rectangular groove 22 and is clamped with the ax-shaped gear 32.

[0028] The ax-shaped gear 32 is locked by the provided locking tooth block 42. When the locking tooth block 42 is clamped with the ax-shaped gear 32, the ax-shaped gear 32 cannot rotate left and right.

[0029] Chutes 26 are symmetrically formed on the side surfaces of the round shafts 25. The locking mechanism includes an annular rotating crown gear 33 slidably sleeved on the round shaft 25. Symmetrically and fixedly connected to the inner side of the annular rotating crown gear 33 are sliders 34. The sliders 34 are slidably connected to the chutes 26 left and right. The sliders 34 are snapped into the chutes 26. Through the provided sliders 34, the round shafts 25 and the annular rotating crown gears 33 can rotate synchronously. A locking spring 35 is sleeved on the round shaft 25. The upper end of the cylindrical surface of the annular rotating crown gear 33 is fixedly connected with an L-shaped transmission plate 36. An extrusion groove 37 is formed through the upper end of the L-shaped transmission plate 36 from top to bottom.

[0030] Both ends of the locking spring 35 are abutted against the spherical seat 2 and the annular rotating crown gear 33 respectively. The locking spring 35 applies an elastic force to the annular rotating crown gear 33. The teeth of the annular rotating crown gear 33 are engaged with the teeth of the annular fixed crown gear 11. Both the annular fixed crown gear 11 and the annular rotating crown gear 33 are formed by annularly arranging a plurality of teeth on the side surface of an annular plate.

[0031] During printing, under the action of the elastic force of the locking spring 35, the teeth of the annular rotating crown gear 33 are engaged with the teeth of the annular fixed crown gear 11, making the annular rotating crown gear 33 unable to rotate. Since the slider 34 is engaged with the chute 26, the round shaft 25 cannot rotate at this time, and thus the spherical seat 2 cannot rotate back and forth. When the front-back tilt adjustment of the printing head main body 7 is required, the L-shaped transmission plate 36 is moved closer to the spherical seat 2. The L-shaped transmission plate 36 drives the annular rotating crown gear 33 to separate from the annular fixed crown gear 11, and the annular rotating crown gear 33 presses the locking spring 35. At this time, the annular rotating crown gear 33 can rotate synchronously with the round shaft 25. Then, by rotating the motor shaft of the first stepping motor forward or backward to drive the round shaft 25 to rotate, the rotating arm 3 is rotated forward or backward, thereby realizing the front-back tilt adjustment of the printing head main body 7.

[0032] Please refer to Figure 2 and Figure 5 As shown in the figure, the unlocking mechanism includes an L-shaped support seat 24 fixedly connected to the upper end of the spherical seat 2. An electric push rod 4 is fixedly connected to the upper end of the L-shaped support seat 24. The lower end of the inner rod of the electric push rod 4 penetrates downward through the upper end of the L-shaped support seat 24 and is fixedly connected to a concave plate 41. The upper ends of the two side plates of the concave plate 41 penetrate upward through the extrusion groove 37, and the inner side wall of the concave plate 41 is in sliding contact with one side of the extrusion groove 37 up and down. The lower ends of the two inner side walls of the concave plate 41 are fixedly connected to extrusion blocks 43. The upper ends of the extrusion blocks 43 are provided with extrusion inclined surfaces. The lower end of the concave plate 41 is fixedly connected to the upper end of the locking tooth block 42.

[0033] When the round shaft 25 and the ax-shaped gear 32 need to be unlocked, the inner rod of the electric push rod 4 contracts, and the inner rod of the electric push rod 4 drives the concave plate 41 to move upward. When the concave plate 41 moves upward, it drives the locking tooth block 42 to move upward synchronously, separating the locking tooth block 42 from the ax-shaped gear 32, thereby releasing the locking of the ax-shaped gear 32. During the upward movement of the concave plate 41, the two side plates of the concave plate 41 slide upward along the extrusion groove 37, and at the same time, the concave plate 41 drives the extrusion blocks 43 to move upward. After the extrusion inclined surface of the extrusion block 43 contacts the lower end of the extrusion groove 37, the concave plate 41 drives the extrusion block 43 to continue to move upward. At this time, the extrusion block 43 is inserted into the extrusion groove 37. At this time, the extrusion inclined surface slides along the lower end of the extrusion groove 37, and at the same time, the extrusion block 43 pushes the L-shaped transmission plate 36 to move closer to the spherical seat 2, and the L-shaped transmission plate 36 drives the annular rotating crown gear 33 to separate from the annular fixed crown gear 11, thereby unlocking the round shaft 25.

[0034] Please refer to Figures 6 to 8, one side of the connecting box 5 is open, and a sealing side plate 6 is fixedly installed on the side of the connecting box 5 with the opening. The sealing side plate 6 is hermetically connected to the connecting box 5, and the connection between the sealing side plate 6 and the connecting box 5 is detachable, preferably by bolts, snap connections, etc., which facilitates the disassembly of the sealing side plate 6, and thus facilitates the cleaning of the inner cavity of the connecting box 5. A plurality of extension seats 61 are equidistantly inserted through the side surface of the sealing side plate 6. The extension seats 61 are fixedly and hermetically connected to the sealing side plate 6. One end of the extension seat 61 is provided with a discharge channel penetrating from the outside to the inside. The outer end of the extension seat 61 near the outside is fixedly connected with an internal thread sleeve 63. The internal thread sleeve 63 is sleeved on the outside of the outer end of the discharge pipeline. The side surface of the printing nozzle body 7 is fixedly inserted with a material guiding pipeline 71. One end of the material guiding pipeline 71 is threadedly connected to the internal thread sleeve 63. A switch adjusting mechanism is installed in each of the plurality of extension seats 61.

[0035] Through the arranged material guiding pipeline 71, the inner cavity of the printing nozzle body 7 is communicated with the inner cavity of the discharge channel, so that the material in the connecting box 5 can flow through the discharge channel into the material guiding pipeline 71, then flow along the material guiding pipeline 71 into the printing nozzle body 7, and finally flow out along the lower end of the printing nozzle body 7, so as to perform printing operations.

[0036] A spherical groove 62 is opened on the inner side of the discharge channel of the extension seat 61. The extension seat 61 is formed by splicing two symmetrically arranged rectangular blocks up and down. The switch adjusting mechanism includes a spherical valve 8 rotatably installed in the spherical groove 62. The upper and lower ends of the spherical valve 8 are symmetrically and fixedly connected with rotating shafts. The spherical valve 8 is rotatably connected to the extension seat 61 through the rotating shafts. A discharge hole 81 is penetrated through the side surface of the spherical valve 8. The upper end of the rotating shaft at the top of the spherical valve 8 sequentially penetrates through the extension seat 61 and the connecting box 5 upward. The upper end of the rotating shaft at the top of the spherical valve 8 is fixedly connected with a polygonal rod 82. A limiting mechanism is installed on the top of the connecting box 5 on the polygonal rod 82.

[0037] By rotating the polygonal rod 82, the polygonal rod 82 drives the spherical valve 8 to rotate through the rotating shaft, so as to adjust the spherical valve 8; When the discharge hole 81 on the side surface of the spherical valve 8 is communicated with the discharge channel, at this time, the discharge hole 81 and the discharge channel are coaxially arranged. The material in the connecting box 5 can flow into one end of the discharge channel, the material passes through the discharge hole 81 and then flows into the material guiding pipeline 71 along the other end of the discharge channel, and then flows into the printing nozzle body 7 along the material guiding pipeline 71.

[0038] When the discharge hole 81 on the side surface of the spherical valve 8 is completely staggered from the discharge channel, at this time, the material in the connecting box 5 cannot flow out through the discharge hole 81, so as to close the discharge channel and prevent the concrete material from flowing out.

[0039] The limiting mechanism includes an upper top plate 85, a lower pressing spring 84, and an adjusting block 83 that are sleeved on the polygonal rod 82 in sequence from top to bottom. The upper top plate 85 is fixedly connected to the upper end of the polygonal rod 82. The adjusting block 83 is slidably connected to the polygonal rod 82 up and down. The lower end of the adjusting block 83 contacts the upper end of the communication box 5. The upper and lower ends of the lower pressing spring 84 are respectively abutted against the upper top plate 85 and the adjusting block 83. The lower pressing spring 84 exerts an elastic force on the adjusting block 83. An L-shaped card seat 86 is fixedly connected to the side of the adjusting block 83. An adjusting ring is fixedly sleeved on the outer side of the upper end of the adjusting block 83; A plurality of annular seats 51 and a plurality of positioning seats 53 are fixedly connected to the upper end of the communication box 5 at equal intervals. The plurality of annular seats 51 and the plurality of positioning seats 53 are alternately distributed. Each annular seat 51 is sleeved on the outer side of an adjusting block 83, and the adjusting block 83 does not contact the inner side of the annular seat 51. Two limiting grooves 52 are opened at the upper end of the annular seat 51. The two limiting grooves 52 are centered on the center of the annular seat 51, and the included angle between the two limiting grooves 52 is 90 degrees, that is, after one limiting groove 52 rotates 90 degrees around the center of the annular seat 51 to approach the other limiting groove 52, the two limiting grooves 52 can coincide. A positioning groove is opened at the upper end of the positioning seat 53; The upper end of the material guiding pipe 71 is fixedly connected with a docking block 72, and a clamping groove 73 is opened at the upper end of the docking block 72.

[0040] The end of the material guiding pipe 71 away from the printing head body 7 is provided with an external thread. After the threaded end of the material guiding pipe 71 is completely screwed into the internal thread sleeve 63, the installation of the material guiding pipe 71 is completed. At this time, the printing head body 7 and the communication box 5 are perpendicular, and the nozzle of the printing head body 7 faces downward; at the same time, the docking block 72 at the upper end of the material guiding pipe 71 is also perpendicular to the communication box 5, and the end of the docking block 72 with the clamping groove 73 faces upward. At the same time, the docking block 72 is aligned with one of the limiting grooves 52 on the annular seat 51.

[0041] When one end of the L-shaped card seat 86 rotates above the positioning seat 53, the L-shaped card seat 86 is clamped with one of the limiting grooves 52 close to the positioning seat 53, and the lower end of the L-shaped card seat 86 is clamped with the positioning groove; at this time, the discharge hole 81 on the side of the spherical valve 8 is completely staggered from the discharge channel.

[0042] When one end of the L-shaped card seat 86 rotates above the docking block 72, the L-shaped card seat 86 is clamped with one of the limiting grooves 52 close to the docking block 72, and the lower end of the L-shaped card seat 86 is clamped with the clamping groove 73; at this time, the discharge hole 81 on the side of the spherical valve 8 is communicated with the discharge channel.

[0043] When it is necessary to adjust the position of the L-shaped card seat 86, pull the adjusting ring upward. The adjusting ring drives the adjusting block 83 to slide upward along the polygonal rod 82. At the same time, the adjusting block 83 compresses the lower pressing spring 84. When the adjusting block 83 moves upward, it drives the L-shaped card seat 86 to move upward synchronously; When the L-shaped clamping seat 86 is removed from the limiting groove 52, the adjusting block 83 is rotated at this time. The adjusting block 83 drives the L-shaped clamping seat 86 to rotate synchronously, so that the L-shaped clamping seat 86 rotates from above one limiting groove 52 to above another limiting groove 52. Then, the adjusting ring and the adjusting block 83 are slowly released. Under the action of the elastic force of the pressing spring 84, the adjusting block 83 slides downward along the polygonal rod 82, and the adjusting block 83 drives the L-shaped clamping seat 86 to be clamped into the limiting groove 52.

[0044] When the lower end of the L-shaped clamping seat 86 in the limiting mechanism is clamped with the positioning groove, the spherical valve 8 is locked at this time, so that the spherical valve 8 cannot rotate along the spherical groove 62, and the spherical valve 8 can stably seal the discharge channel. When the lower end of the L-shaped clamping seat 86 in the limiting mechanism is clamped with the clamping groove 73, the L-shaped clamping seat 86 locks the docking block 72 at this time, so that the docking block 72 cannot rotate along with the material guiding pipe 71. Furthermore, the material guiding pipe 71 is firmly installed on the internal thread sleeve 63. Furthermore, the printing head main body 7 and the communication box 5 can be kept relatively fixed, and the printing head main body 7 can stably perform printing operations.

[0045] The printing head main body 7 on the side of the communication box 5 can be increased or decreased as needed. When the printing head main body 7 is disassembled from the communication box 5, the spherical valve 8 can stably seal the discharge channel. After the printing head main body 7 is installed on the communication box 5, the discharge hole 81 on the side of the spherical valve 8 is communicated with the discharge channel.

[0046] Working principle: During printing work, the concrete pump sends concrete materials into the inner cavity of the communication box 5 through the feeding hose 54. The concrete materials flow into the inner cavity of the communication box 5 and then into one end of the discharge channel. The concrete materials pass through the discharge hole 81 and then flow into the material guiding pipe 71 at the other end of the discharge channel. The concrete materials flow into the printing head main body 7 along the material guiding pipe 71, and finally the concrete materials flow out from the lower end of the printing head main body 7, so as to perform printing operations.

[0047] When it is necessary to increase the printing head main body 7, one end of the material guiding pipe 71 on the side of the new printing head main body 7 is screwed into the internal thread sleeve 63, so as to complete the installation of the material guiding pipe 71 and the printing head main body 7. Pull the adjusting ring upward. The adjusting ring drives the adjusting block 83 to slide upward along the polygonal rod 82. At the same time, the adjusting block 83 presses the pressing spring 84, and the adjusting block 83 drives the L-shaped clamping seat 86 to move upward and be removed from the limiting groove 52. At this time, the adjusting block 83 is rotated, and the adjusting block 83 drives the L-shaped clamping seat 86 to rotate synchronously, so that the L-shaped clamping seat 86 rotates from the upper side of the positioning seat 53 to the upper side of the docking block 72. During the rotation of the adjusting block 83, the polygonal rod 82 is driven to rotate synchronously, and the polygonal rod 82 drives the ball valve 8 to rotate through the rotating shaft, so that the discharge hole 81 on the side of the ball valve 8 is connected with the discharge channel; Then slowly loosen the adjusting ring and the adjusting block 83, and the adjusting block 83 slides downward along the polygonal rod 82 under the action of the elastic force of the downward pressure spring 84, and the adjusting block 83 drives the L-shaped clamping seat 86 to clamp into the limiting groove 52, so that the lower end of the L-shaped clamping seat 86 is clamped with the clamping groove 73; The docking block 72 is locked by the L-shaped holder 86 so that the docking block 72 cannot rotate with the material guide pipe 71, so that the material guide pipe 71 is firmly installed on the internal threaded sleeve 63, so that the print head body 7 and the connecting box 5 can remain relatively fixed, so that the print head body 7 can stably perform printing operations.

[0048] When the print head body 7 needs to be reduced, one end of the L-shaped holder 86 is rotated from above the docking block 72 to above the positioning seat 53, so that the lower end of the L-shaped holder 86 is engaged with the positioning groove. At this time, the discharge hole 81 on the side of the ball valve 8 is completely offset from the discharge channel, thereby closing the discharge channel, and at the same time, the L-shaped holder 86 releases the lock of the docking block 72; At this time, the material guiding pipe 71 is screwed out from the internal thread sleeve 63 , so that the material guiding pipe 71 and the printing head body 7 are disassembled.

[0049] When in use, the number of the printing head bodies 7 on the side of the connecting box 5 can be increased or decreased as needed, so that the width of the printing range can be adjusted, and at the same time the printing speed of the concrete material can be increased, thereby improving work efficiency; the disassembly and installation of the printing head body 7 is simple and convenient, which is convenient for the staff to operate.

[0050] When the tilt angle of the print head body 7 needs to be adjusted, the inner rod of the electric push rod 4 is contracted, and the inner rod of the electric push rod 4 drives the concave plate 41 to move upward. When the concave plate 41 moves upward, it drives the locking tooth block 42 to move upward synchronously, so that the locking tooth block 42 is separated from the axe-shaped gear 32, thereby releasing the lock of the axe-shaped gear 32; During the upward movement of the concave plate 41, the concave plate 41 drives the two extrusion blocks 43 to move upward, and the two extrusion blocks 43 respectively push the two L-shaped transmission plates 36 to move close to the spherical seat 2, and the L-shaped transmission plates 36 drive the annular rotating crown gear 33 to separate from the annular fixed crown gear 11, thereby unlocking the circular shaft 25.

[0051] The motor shaft of the first stepping motor rotates forward or backward to drive the rotation of the circular shaft 25. The circular shaft 25 drives the rotating arm 3 to rotate forward or backward through the spherical seat 2. The rotating arm 3 drives the connecting box 5 to rotate forward or backward. The connecting box 5 drives the printing head body 7 to rotate forward or backward, thereby adjusting the tilt angle of the printing head body 7 and realizing the front-back tilt adjustment of the printing head body 7.

[0052] The output shaft of the second stepping motor rotates forward or backward to drive the rotation of the ax-shaped gear 32. The ax-shaped gear 32 drives the rotating arm 3 to swing left or right along the fan-shaped rotating groove 21. The rotating arm 3 drives the connecting box 5 to rotate left or right. The connecting box 5 drives the printing head body 7 to rotate left or right, thereby adjusting the tilt angle of the printing head body 7 and realizing the left-right tilt adjustment of the printing head body 7.

[0053] Through the cooperation of the first stepping motor and the second stepping motor, the rotating arm 3 can tilt and rotate in multiple directions, so that the printing head body 7 can tilt in multiple directions, and further enable the printing head body 7 to adapt to the printing requirements of different scenarios.

[0054] After the adjustment is completed, the inner rod of the electric push rod 4 extends downward. The inner rod of the electric push rod 4 drives the concave plate 41 to move downward. The concave plate 41 drives the locking tooth block 42 to engage with the ax-shaped gear 32, thereby locking the ax-shaped gear 32, making the ax-shaped gear 32 and the rotating arm 3 unable to rotate left and right, and further making the printing head body 7 unable to continue to tilt left or right; After the concave plate 41 moves downward, the concave plate 41 drives the two extrusion blocks 43 to move downward out of the two extrusion grooves 37 respectively, so that the extrusion blocks 43 release the extrusion on the L-shaped transmission plate 36. Under the action of the elastic force of the locking spring 35, the annular rotating crown gear 33 is engaged with the annular fixed crown gear 11, thereby locking the annular rotating crown gear 33. Since the annular rotating crown gear 33 rotates synchronously with the circular shaft 25, the circular shaft 25 cannot rotate either, realizing the locking of the circular shaft 25 and the spherical seat 2, and further making the printing head body 7 unable to continue to tilt forward or backward.

[0055] Through the set unlocking mechanism, when the tilt angle of the printing head body 7 needs to be adjusted, the unlocking mechanism moves upward to release the locking of the circular shaft 25 by the locking mechanism, and at the same time makes the locking tooth block 42 release the locking of the ax-shaped gear 32. At this time, the tilt angle of the printing head body 7 can be adjusted according to needs; after the adjustment is completed, the unlocking mechanism resets downward to lock the circular shaft 25 by the locking mechanism and lock the ax-shaped gear 32 by the locking tooth block 42. At this time, the printing head body 7 cannot be tilted and adjusted, and further enables the printing head body 7 to perform printing operations stably and accurately.

[0056] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A print head for a building 3D printing device that is convenient for adjusting the position, including a concave frame (1), characterized in that: At the lower end of the inner side of the concave frame (1), a spherical seat (2) is provided. A part of the upper end of the spherical seat (2) is horizontally cut off to form a plane. At the lower end of the spherical seat (2), a fan-shaped rotating groove (21) is recessed upward. At the upper end of the fan-shaped rotating groove (21), a rectangular groove (22) is penetrated downward. On the left and right sides of the spherical seat (2) symmetrically, a circular shaft (25) is fixedly connected. The circular shaft (25) is rotationally connected to the two side plates of the concave frame (1). One of the circular shafts (25) is driven by the motor shaft of a first stepping motor fixedly installed on the outer side of the concave frame (1). An ax-shaped gear (32) is installed in the rectangular groove (22). At the lower end of the ax-shaped gear (32), a rotating arm (3) is fixedly connected. The lower end of the rotating arm (3) penetrates downward through the fan-shaped rotating groove (21) and extends to the outside. The ax-shaped gear (32) is driven by the output shaft of a second stepping motor fixedly installed in the spherical seat (2). At the lower end of the rotating arm (3), a connecting box (5) is fixedly connected. The feeding end of the connecting box (5) is connected with a feeding hose (54) through a joint. On the side of the connecting box (5), a printing nozzle body (7) is connected.

2. The print head for a building 3D printing device that is convenient for adjusting the position according to claim 1, characterized in that: The rotating arm (3) is slidably connected with the fan-shaped rotating groove (21). On the front and rear inner side walls of the fan-shaped rotating groove (21), arc-shaped guiding grooves (23) are symmetrically opened. On the front and rear sides of the rotating arm (3), fan-shaped blocks (31) are symmetrically fixedly connected. The fan-shaped blocks (31) are slidably connected with the arc-shaped guiding grooves (23).

3. The printing head for a building 3D printing device with adjustable position according to claim 1, characterized in that: At the lower ends of the two inner side walls of the concave frame (1), annular fixed crown gears (11) are symmetrically fixedly connected. The two annular fixed crown gears (11) are respectively sleeved on the outer sides of the two circular shafts (25). The circular shafts (25) can rotate along the inner sides of the annular fixed crown gears (11). Locking mechanisms are symmetrically sleeved on the two circular shafts (25). An unlocking mechanism is installed at the upper end of the spherical seat (2) between the two locking mechanisms. The lower end of the unlocking mechanism is fixedly connected with a locking tooth block (42). The lower end of the locking tooth block (42) extends into the rectangular groove (22) and is clamped with the ax-shaped gear (32).

4. The print head for a building 3D printing device that is convenient for adjusting the position according to claim 3, characterized in that: On the side of the circular shaft (25), sliding grooves (26) are symmetrically opened. The locking mechanism includes an annular rotating crown gear (33) slidably sleeved on the circular shaft (25). On the inner side of the annular rotating crown gear (33), sliders (34) are symmetrically fixedly connected. The sliders (34) are slidably connected with the sliding grooves (26) left and right. A locking spring (35) is sleeved on the circular shaft (25). At the upper end of the cylindrical surface of the annular rotating crown gear (33), an L-shaped transmission plate (36) is fixedly connected. An extrusion groove (37) is penetrated downward from the upper end of the L-shaped transmission plate (36).

5. The print head for a building 3D printing device that is convenient for adjusting the position according to claim 4, characterized in that: The two ends of the locking spring (35) respectively abut against the spherical seat (2) and the annular rotating crown gear (33). The teeth of the annular rotating crown gear (33) are clamped with the teeth of the annular fixed crown gear (11).

6. The printing head for a building 3D printing device that is convenient for adjusting the position according to claim 3, characterized in that: The unlocking mechanism includes an L-shaped support base (24) fixedly connected to the upper end of the spherical seat (2). An electric push rod (4) is fixedly connected to the upper end of the L-shaped support base (24). The lower end of the inner rod of the electric push rod (4) penetrates downward through the upper end of the L-shaped support base (24) and is fixedly connected to a concave plate (41). The upper ends of the two side plates of the concave plate (41) penetrate upward through the extrusion groove (37), and the inner side wall of the concave plate (41) is in sliding contact with one side of the extrusion groove (37) up and down. The lower ends of the two inner side walls of the concave plate (41) are fixedly connected with extrusion blocks (43). An extrusion inclined surface is provided at the upper end of the extrusion block (43). The lower end of the concave plate (41) is fixedly connected to the upper end of the locking tooth block (42).

7. A print head for a building 3D printing device that is convenient for adjusting the position, characterized in that: One side of the communication box (5) is open. A sealing side plate (6) is fixedly installed on the side of the communication box (5) where the opening is provided. A plurality of extension seats (61) are equidistantly inserted through the side surface of the sealing side plate (6). A discharge channel is opened from the outside to the inside at one end of the extension seat (61). An internal thread sleeve (63) is fixedly connected to the outer side end of the extension seat (61). A material guiding pipe (71) is fixedly inserted on the side surface of the printing nozzle body (7). One end of the material guiding pipe (71) is threadedly connected to the internal thread sleeve (63). A switch adjusting mechanism is installed in each of the plurality of extension seats (61).

8. The print head for a building 3D printing device that is convenient for adjusting the position according to claim 7, characterized in that: A spherical groove (62) is provided inside the discharge channel on the extension seat (61). The switch adjusting mechanism includes a spherical valve (8) rotatably installed in the spherical groove (62). The upper and lower ends of the spherical valve (8) are symmetrically and fixedly connected with rotating shafts. The spherical valve (8) is rotationally connected to the extension seat (61) through the rotating shafts. A discharge hole (81) is provided through the side surface of the spherical valve (8). The upper end of the rotating shaft at the top of the spherical valve (8) penetrates upward through the extension seat (61) and the communication box (5) in sequence. A polygonal rod (82) is fixedly connected to the upper end of the rotating shaft at the top of the spherical valve (8). A limiting mechanism is installed on the top of the communication box (5) on the polygonal rod (82).

9. The printing head for a building 3D printing device that is convenient for adjusting the position according to claim 8, characterized in that: The limiting mechanism includes an upper top plate (85), a downward pressing spring (84) and an adjusting block (83) sleeved on the polygonal rod (82) in sequence from top to bottom. The upper top plate (85) is fixedly connected to the upper end of the polygonal rod (82). The adjusting block (83) is in sliding connection with the polygonal rod (82) up and down. The lower end of the adjusting block (83) is in contact with the upper end of the communication box (5). The upper and lower ends of the downward pressing spring (84) are respectively abutted against the upper top plate (85) and the adjusting block (83). The downward pressing spring (84) applies an elastic force to the adjusting block (83). An L-shaped clamping seat (86) is fixedly connected to the side surface of the adjusting block (83). An adjusting ring is fixedly sleeved on the outer side of the upper end of the adjusting block (83); A plurality of annular seats (51) and a plurality of positioning seats (53) are fixedly connected to the upper end of the connecting box (5) at equal intervals, and the plurality of annular seats (51) and the plurality of positioning seats (53) are alternately distributed. Each annular seat (51) is sleeved on the outer side of an adjusting block (83). Two limiting grooves (52) are formed in the upper end of the annular seat (51), and a positioning groove is formed in the upper end of the positioning seat (53).

10. A print head for a building 3D printing device that is convenient for adjusting the position, characterized in that: A docking block (72) is fixedly connected to the upper end of the material guiding pipe (71), and a clamping groove (73) is formed in the upper end of the docking block (72).

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