3D printing head for construction with interlayer reinforcements

Abstract

A 3D printing head for construction with interlayer reinforcement material is used for automated rapid construction of buildings. The printing head comprises a cement mortar extrusion mechanism (1), an interlayer reinforcement material positioning mechanism (2) and an interlayer reinforcement material forming mechanism (3). The interlayer reinforcement material forming mechanism (3) is integrally mounted on the lower side of the interlayer reinforcement material positioning mechanism (2). The entire printing head is mounted on a 3D printing motion device via a connecting platform. The 3D printing of cement mortar and the addition of spiral steel wires for interlayer reinforcement material can be performed simultaneously, thereby improving the connection strength between cement mortar layers, and the width of each cement mortar print can be adjusted. The printing head of the present invention can realize automated 3D printing construction of buildings, with high efficiency, material saving, and fast construction speed. It replaces manual operation, reduces the labor intensity of workers, and realizes personalized construction on demand.

Description

Technical Field

[0001] The invention relates to a 3D printing head for construction, in particular to a 3D printing head for construction with an interlayer reinforcement material, and belongs to the technical field of automated building rapid construction devices. Background Art

[0002] House construction plays an extremely important role in our lives. 3D printing construction technology is an advanced rapid prototyping technology and an emerging technology in digital construction technology. Through the powerful graphics processing capabilities of computers, the designed building model is transformed into several printing layers, and the building materials are printed layer by layer through printing equipment to form a solid three-dimensional building. It has the advantages of high construction efficiency, cost saving, and green environmental protection. At present, 3D printing construction technology has been continuously applied and developed in the field of construction.

[0003] Since building materials are laid layer by layer during the printing process, the bonding force between layers is relatively weak, which limits the strength of the printed buildings. 3D printing used in construction has high requirements on materials. Currently, building printing technology and materials are not mature enough, and there is a serious waste of materials during the printing process. These reasons have limited the application and development of 3D printing technology in the construction industry. Summary of the invention

[0004] Based on the above reasons, the present invention proposes a 3D printing head for construction with interlayer reinforcement material, which can add reinforcement material between two printed layers of cement mortar, which is beneficial to improve the bonding strength between the layers of cement mortar, improve the strength of the building, shorten the construction time of the house, improve the construction efficiency, reduce the waste of building materials, reduce costs, and protect the environment.

[0005] The 3D printing head for construction with interlayer reinforcement material is used for rapid construction of automated buildings. The printing head includes a cement mortar extrusion mechanism 1, an interlayer reinforcement material positioning mechanism 2, and an interlayer reinforcement material forming mechanism 3. The cement mortar extrusion mechanism 1 is installed vertically, the interlayer reinforcement material positioning mechanism 2 is installed on one side of the lower middle part of the cement mortar extrusion mechanism 1, and the interlayer reinforcement material forming mechanism 3 is installed as a whole on the lower side of the interlayer reinforcement material positioning mechanism 2. The entire printing head is installed on the 3D printing motion device through a connecting platform.

[0006] The cement mortar extrusion mechanism 1 includes an extrusion motor 1-1, an upper support 1-2, a bearing 1-3, a fixed sleeve 1-4, a feed port 1-5, an auger 1-6, a barrel 1-7, a connecting platform 1-8, a print width adjustment motor 1-9, a crank 1-10, a connecting rod 1-11, a baffle 1-12 and a discharge nozzle 1-13. The upper support 1-2 is fixed to the upper end of the barrel 1-7, the extrusion motor 1-1 is vertically fixed on the upper support 1-2, the output shaft of the extrusion motor 1-1 is fixedly connected to the fixed sleeve 1-4, the fixed sleeve 1-4 is installed in the upper support 1-2 through the bearing 1-3, and the auger 1-6 is installed at the lower end of the fixed sleeve 1-4. A feed port 1-5 is provided on the side of the barrel 1-7, and a discharge nozzle 1-13 is provided at the lower end of the barrel 1-7. The print width adjustment motor 1-9 is horizontally mounted on a platform on one side of the lower part of the cylinder 1-7. A crank 1-10 is mounted on the output shaft of the print width adjustment motor 1-9. The other end of the crank 1-10 is connected to the connecting rod 1-11 through a rotating shaft. The other end of the connecting rod 1-11 is connected to the baffle 1-12 through a rotating shaft. The baffle 1-12 is mounted on both sides of the lower end of the discharge nozzle 1-13 through a rotating shaft. The print width adjustment motor 1-9, the crank 1-10, the connecting rod 1-11, and the baffle 1-12 constitute a cement mortar extrusion width adjustment mechanism. Two sets of cement mortar extrusion width adjustment mechanisms are symmetrically arranged on both sides of the lower part of the cylinder 1-7. A connecting platform 1-8 is provided in the middle of the outer side of the cylinder 1-7.

[0007] The connecting frame 2-1 is fixedly connected with the connecting platform 1-8. The interlayer reinforcement material positioning mechanism 2 includes a connecting frame 2-1, a positioning motor 2-2, a support seat 2-3, an upper platform 2-4, a guide column 2-5, a guide sleeve 2-6, a positioning screw 2-7, a seat nut 2-8, a lower platform 2-9 and a guide column seat 2-10. An upper platform 2-4 is provided on the right side of the lower end of the connecting frame 2-1, the support seat 2-3 is fixed on the upper platform 2-4, the positioning motor 2-2 is vertically installed on the side of the connecting frame 2-1, the upper end of the positioning screw 2-7 is connected to the output shaft of the positioning motor 2-2, and the upper shaft end of the positioning screw 2-7 is installed in the support seat 2-3 through a rolling bearing. Two guide column seats 2-10 are fixedly installed under the upper platform 2-4, and are symmetrical on both sides of the positioning screw 2-7. Two guide sleeves 2-6 are symmetrically fixedly installed on the lower platform 2-9, the upper end of the guide column 2-5 is fixed in the guide column seat 2-10, and the lower end is inserted into the guide sleeve 2-6. The seat nut 2-8 is fixedly installed on the lower platform 2-9 and cooperates with the adjustment screw 2-7.

[0008] The frame 3-1 is fixedly connected with the lower platform 2-9. The interlayer reinforcement material forming mechanism 3 includes a frame 3-1, a diameter adjustment motor fixing plate 3-2, a diameter adjustment motor 3-3, a pitch adjustment motor 3-4, a diameter adjustment screw 3-5, a lower support plate 3-6, an adjustment nut 3-7, a wire feeding motor 3-8, a forming fixing plate 3-9, a forming pressure wheel 3-10, a forming pressure wheel shaft 3-11, a lower cutter 3-12, an upper cutter 3-13, a wire feeding driving wheel 3-14, a clamping wheel 3-15, a pitch adjustment rod 3-16, a wire drum 3-17, a gear 3-18, a rack 3-19 and a slide 3-20. The diameter adjustment motor fixing plate 3-2 is fixed on the inner side of the top of the frame 3-1, and the diameter adjustment motor 3-3 is vertically installed on the right side. The diameter adjustment screw 3-5 is installed on the output shaft of the diameter adjustment motor 3-3, and an adjustment nut 3-7 is installed at the lower end. The wire drum 3-17 is vertically mounted on the rear side of the frame 3-1 through a rotating shaft. A forming fixed plate 3-9 is fixed to the lower part of the right side of the frame 3-1. A lower support plate 3-6 is provided in the middle and lower part of the frame 3-1. The wire feeding motor 3-8 is horizontally mounted below the lower support plate 3-6, and the output shaft of the wire feeding motor 3-8 passes through the forming fixed plate 3-9, and a wire feeding driving wheel 3-14 is fixedly mounted on the shaft end. The pressure wheel 3-15 is mounted on the outer side of the forming fixed plate 3-9 and is arranged above the wire feeding driving wheel 3-14. The forming pressure wheel 3-10 is installed in the vertical long groove of the forming fixed plate 3-9 through the forming pressure wheel shaft 3-11, and the forming pressure wheel 3-10 is installed at the right end of the forming pressure wheel shaft 3-11. The adjusting nut 3-7 passes through the upper side of the forming fixed plate 3-9 and is connected to the forming pressure wheel shaft 3-11. The chute 3-20 is installed on the lower support plate 3-6, the pitch adjustment motor 3-4 is installed horizontally on the left part of the lower support plate 3-6, the output shaft is equipped with a gear 3-18, which meshes with the rack 3-19, the rack 3-19 is installed in the chute 3-20, and passes through the square hole at the upper right corner of the forming fixed plate 3-9, and the pitch adjustment rod 3-16 is fixed to the right end of the rack 3-19. The lower cutter 3-12 is fixed on the lower part of the outer side of the forming fixed plate 3-9, and the upper cutter 3-13 is fixed on the right end of the forming pressure wheel shaft 3-11.

[0009] The beneficial technical effects of the present invention are:

[0010] The 3D printing of cement mortar and the addition of spiral steel wire as interlayer reinforcement material can be carried out simultaneously, which improves the connection strength between cement mortar layers, and the width of cement mortar printed each time can be adjusted. The print head of the present invention can realize the automated 3D printing construction of buildings, which is efficient, saves materials, and has a fast construction speed. It replaces manual operation, reduces the labor intensity of workers, and realizes personalized construction on demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a schematic diagram of the overall structure of a 3D printing head for construction with interlayer reinforcement material according to the present invention;

[0012] Figure 2 It is a schematic diagram of the overall structure of the cement mortar extrusion mechanism 1 of the present invention;

[0013] Figure 3 It is a schematic diagram of the overall structure of the interlayer reinforcement material positioning mechanism 2 of the present invention;

[0014] Figure 4 is a schematic diagram of the overall structure of the interlayer reinforcement material forming mechanism 3 of the present invention from perspective 1;

[0015] Figure 5 is a second perspective diagram of the overall structure of the interlayer reinforcement material forming mechanism 3 of the present invention;

[0016] Figure 6 It is a partial enlarged structural schematic diagram of the A part of the interlayer reinforcement material forming mechanism 3 of the present invention;

[0017] Figure 7 It is a structural schematic diagram of the pitch adjusting rod 3-16 of the present invention. DETAILED DESCRIPTION

[0018] Combination Figure 1-7 The structure and operation of the present invention are described.

[0019] The 3D printing head for construction with interlayer reinforcement material is used for rapid construction of automated buildings. The printing head includes a cement mortar extrusion mechanism 1, an interlayer reinforcement material positioning mechanism 2, and an interlayer reinforcement material forming mechanism 3. The cement mortar extrusion mechanism 1 is installed vertically, the interlayer reinforcement material positioning mechanism 2 is installed on one side of the lower middle part of the cement mortar extrusion mechanism 1, and the interlayer reinforcement material forming mechanism 3 is installed as a whole on the lower side of the interlayer reinforcement material positioning mechanism 2. The entire printing head is installed on the 3D printing motion device through a connecting platform.

[0020] The cement mortar extrusion mechanism 1 includes an extrusion motor 1-1, an upper support 1-2, a bearing 1-3, a fixed sleeve 1-4, a feed port 1-5, an auger 1-6, a barrel 1-7, a connecting platform 1-8, a print width adjustment motor 1-9, a crank 1-10, a connecting rod 1-11, a baffle 1-12 and a discharge nozzle 1-13. The upper support 1-2 is fixed to the upper end of the barrel 1-7, the extrusion motor 1-1 is vertically fixed on the upper support 1-2, the output shaft of the extrusion motor 1-1 is fixedly connected to the fixed sleeve 1-4, the fixed sleeve 1-4 is installed in the upper support 1-2 through the bearing 1-3, and the auger 1-6 is installed at the lower end of the fixed sleeve 1-4. A feed port 1-5 is provided on the side of the barrel 1-7, and a discharge nozzle 1-13 is provided at the lower end of the barrel 1-7. The print width adjustment motor 1-9 is horizontally mounted on a platform on one side of the lower part of the cylinder 1-7. A crank 1-10 is mounted on the output shaft of the print width adjustment motor 1-9. The other end of the crank 1-10 is connected to the connecting rod 1-11 through a rotating shaft. The other end of the connecting rod 1-11 is connected to the baffle 1-12 through a rotating shaft. The baffle 1-12 is mounted on both sides of the lower end of the discharge nozzle 1-13 through a rotating shaft. The print width adjustment motor 1-9, the crank 1-10, the connecting rod 1-11, and the baffle 1-12 constitute a cement mortar extrusion width adjustment mechanism. Two sets of cement mortar extrusion width adjustment mechanisms are symmetrically arranged on both sides of the lower part of the cylinder 1-7. A connecting platform 1-8 is provided in the middle of the outer side of the cylinder 1-7.

[0021] The connecting frame 2-1 is fixedly connected with the connecting platform 1-8. The interlayer reinforcement material positioning mechanism 2 includes a connecting frame 2-1, a positioning motor 2-2, a support seat 2-3, an upper platform 2-4, a guide column 2-5, a guide sleeve 2-6, a positioning screw 2-7, a seat nut 2-8, a lower platform 2-9 and a guide column seat 2-10. An upper platform 2-4 is provided on the right side of the lower end of the connecting frame 2-1, the support seat 2-3 is fixed on the upper platform 2-4, the positioning motor 2-2 is vertically installed on the side of the connecting frame 2-1, the upper end of the positioning screw 2-7 is connected to the output shaft of the positioning motor 2-2, and the upper shaft end of the positioning screw 2-7 is installed in the support seat 2-3 through a rolling bearing. Two guide column seats 2-10 are fixedly installed under the upper platform 2-4, and are symmetrical on both sides of the positioning screw 2-7. Two guide sleeves 2-6 are symmetrically fixedly installed on the lower platform 2-9, the upper end of the guide column 2-5 is fixed in the guide column seat 2-10, and the lower end is inserted into the guide sleeve 2-6. The seat nut 2-8 is fixedly installed on the lower platform 2-9 and cooperates with the adjustment screw 2-7.

[0022] The frame 3-1 is fixedly connected with the lower platform 2-9. The interlayer reinforcement material forming mechanism 3 includes a frame 3-1, a diameter adjustment motor fixing plate 3-2, a diameter adjustment motor 3-3, a pitch adjustment motor 3-4, a diameter adjustment screw 3-5, a lower support plate 3-6, an adjustment nut 3-7, a wire feeding motor 3-8, a forming fixing plate 3-9, a forming pressure wheel 3-10, a forming pressure wheel shaft 3-11, a lower cutter 3-12, an upper cutter 3-13, a wire feeding driving wheel 3-14, a clamping wheel 3-15, a pitch adjustment rod 3-16, a wire drum 3-17, a gear 3-18, a rack 3-19 and a slide 3-20. The diameter adjustment motor fixing plate 3-2 is fixed on the inner side of the top of the frame 3-1, and the diameter adjustment motor 3-3 is vertically installed on the right side. The diameter adjustment screw 3-5 is installed on the output shaft of the diameter adjustment motor 3-3, and an adjustment nut 3-7 is installed at the lower end. The wire drum 3-17 is vertically mounted on the rear side of the frame 3-1 through a rotating shaft. A forming fixed plate 3-9 is fixed to the lower part of the right side of the frame 3-1. A lower support plate 3-6 is provided in the middle and lower part of the frame 3-1. The wire feeding motor 3-8 is horizontally mounted below the lower support plate 3-6, and the output shaft of the wire feeding motor 3-8 passes through the forming fixed plate 3-9, and a wire feeding driving wheel 3-14 is fixedly mounted on the shaft end. The pressure wheel 3-15 is mounted on the outer side of the forming fixed plate 3-9 and is arranged above the wire feeding driving wheel 3-14. The forming pressure wheel 3-10 is installed in the vertical long groove of the forming fixed plate 3-9 through the forming pressure wheel shaft 3-11, and the forming pressure wheel 3-10 is installed at the right end of the forming pressure wheel shaft 3-11. The adjusting nut 3-7 passes through the upper side of the forming fixed plate 3-9 and is connected to the forming pressure wheel shaft 3-11. The chute 3-20 is installed on the lower support plate 3-6, the pitch adjustment motor 3-4 is installed horizontally on the left part of the lower support plate 3-6, the output shaft is equipped with a gear 3-18, which meshes with the rack 3-19, the rack 3-19 is installed in the chute 3-20, and passes through the square hole at the upper right corner of the forming fixed plate 3-9, and the pitch adjustment rod 3-16 is fixed to the right end of the rack 3-19. The lower cutter 3-12 is fixed on the lower part of the outer side of the forming fixed plate 3-9, and the upper cutter 3-13 is fixed on the right end of the forming pressure wheel shaft 3-11.

[0023] The working process of the device of the present invention:

[0024] (1) Cement mortar feeding

[0025] The cement mortar extrusion mechanism 1 is driven by a 3D printing motion device to move along the designed route. The cement mortar is fed into the cement mortar extrusion mechanism 1 through the feed port 1-5 from the external conveying pipe. The extrusion motor 1-1 rotates, driving the auger 1-6 to rotate, and the cement mortar is squeezed out from the discharge nozzle 1-13 and laid out into shape.

[0026] (2) Spiral wire forming

[0027] When it is necessary to add interlayer reinforcement material, the interlayer reinforcement material forming mechanism 3 starts to work. The steel wire comes out from the steel wire drum 3-17, and the wire feeding motor 3-8 drives the wire feeding driving wheel 3-14 to rotate, and the pressing wheel 3-15 squeezes the steel wire to feed it, and then together with the forming pressing wheel 3-10, the steel wire is turned into a spiral shape. Part of the spiral steel wire is buried in the cement mortar, and the other part is exposed above, waiting to be covered by the next layer of cement mortar;

[0028] When the wire feeding is finished, the wire feeding motor 3-8 stops rotating, the pitch adjusting rod 3-16 moves backward, and the diameter adjusting motor 3-3 drives the upper cutter 3-13 to move downward, and cooperates with the lower cutter 3-12 on the forming fixed plate 3-9 to cut the formed spiral steel wire;

[0029] When printing does not require the addition of interlayer reinforcing materials, such as printing the top layer, it can be achieved by simply making the cement mortar extrusion mechanism 1 work and the interlayer reinforcing material forming mechanism 3 not work.

[0030] (3) Cement mortar extrusion speed adjustment

[0031] The extrusion speed of the cement mortar can be controlled by adjusting the rotation speed of the extrusion motor 1 - 1 to achieve different printing speeds or printing layer thicknesses.

[0032] (4) Cement mortar printing width adjustment

[0033] The rotation of the print width adjustment motor 1-9 can control the opening and closing amplitude of the baffles 1-12 on both sides of the discharge nozzle 1-13, thereby controlling the print width of the cement mortar. When parallel printing is required, the baffle 1-12 arranged on one side of the discharge nozzle 1-13 is lifted above the horizontal position to meet the needs of parallel printing.

[0034] (5) Adjustment of spiral wire pitch

[0035] The pitch adjusting motor 3-4 drives the rack 3-19 with the gear 3-18, thereby driving the pitch adjusting rod 3-16 to move, and the horizontal bar at the lower end of the pitch adjusting rod 3-16 moves the steel wire to control the pitch of the spiral steel wire.

[0036] (6) Adjustment of spiral wire spiral diameter

[0037] The diameter adjustment motor 3-3 drives the adjustment nut 3-7 to move up and down, thereby changing the up and down position of the forming pressing wheel 3-10, and the spiral diameter of the spiral steel wire can be adjusted.

[0038] (7) Adjustment of the embedding depth of spiral steel wire

[0039] When it is necessary to change the depth of the spiral steel wire buried in the cement mortar, the positioning motor 2-2 of the interlayer reinforcement material positioning mechanism 2 is started, and the lower platform 2-9 is driven up and down through the screw nut mechanism, thereby changing the up and down position of the interlayer reinforcement material forming mechanism 3, thereby adjusting the embedment depth of the spiral steel wire in the cement mortar.

Claims

1. A 3D printing head for construction with interlayer reinforcement material, used for rapid automated construction, the printing head comprising a cement mortar extrusion mechanism (1), an interlayer reinforcement material positioning mechanism (2) and an interlayer reinforcement material forming mechanism (3), characterized in that: The cement mortar extrusion mechanism (1) is installed vertically, the interlayer reinforcement material positioning mechanism (2) is installed on one side of the lower middle part of the cement mortar extrusion mechanism (1), the interlayer reinforcement material forming mechanism (3) is installed as a whole on the lower side of the interlayer reinforcement material positioning mechanism (2), and the entire print head is installed on the 3D printing motion device through a connecting platform. The interlayer reinforcement material positioning mechanism (2) includes a connecting frame (2-1), a positioning motor (2-2), a support seat (2-3), an upper platform (2-4), a guide column (2-5), a guide sleeve (2-6), a positioning screw (2-7), a seat nut (2-8), a lower platform (2-9) and a guide column seat (2-10). The connecting frame (2-1) is fixedly connected to the cement mortar extrusion mechanism (1). The connecting frame (2-1) An upper platform (2-4) is provided on the right side of the lower end, a support seat (2-3) is fixed on the upper platform (2-4), a positioning motor (2-2) is vertically installed on the side of the connecting frame (2-1), an upper end of a positioning screw (2-7) is connected to an output shaft of the positioning motor (2-2), an upper shaft end of the positioning screw (2-7) is installed in the support seat (2-3) through a rolling bearing, two guide column seats (2-10) are fixedly installed under the upper platform (2-4), and symmetrically on both sides of the positioning screw (2-7), two guide sleeves (2-6) are symmetrically fixedly installed on the lower platform (2-9), an upper end of a guide column (2-5) is fixed in the guide column seat (2-10), and a lower end is inserted into the guide sleeve (2-6), and a seat nut (2-8) is fixedly installed on the lower platform (2 -9), in cooperation with the adjusting screw (2-7), the interlayer reinforcement material forming mechanism (3) includes a frame (3-1), a diameter adjustment motor fixing plate (3-2), a diameter adjustment motor (3-3), a pitch adjustment motor (3-4), a diameter adjustment screw (3-5), a lower support plate (3-6), an adjusting nut (3-7), a wire feeding motor (3-8), a forming fixing plate (3-9), a forming pressure wheel (3-10), a forming pressure wheel shaft (3-11), a lower cutting knife (3-12), an upper cutting knife (3-13), a wire feeding driving wheel (3-14), a clamping wheel (3-15), a pitch adjustment rod (3-16), a wire drum (3-17), a gear (3-18), a rack (3-19) and a slide groove (3-20), the frame (3-1) is fixedly connected to the interlayer reinforcement material positioning mechanism (2), the diameter adjustment motor fixing plate (3-2) is fixed on the inner side of the top of the frame (3-1), the diameter adjustment motor (3-3) is vertically installed on the right side, the diameter adjustment screw (3-5) is installed on the output shaft of the diameter adjustment motor (3-3), and the lower end is installed with an adjustment nut (3-7), the wire drum (3-17) is vertically installed on the rear side of the frame (3-1) through a rotating shaft, a forming fixing plate (3-9) is fixed on the lower part of the right side of the frame (3-1), a lower support plate (3-6) is provided in the middle and lower part of the frame (3-1), the wire feeding motor (3-8) is horizontally installed below the lower support plate (3-6), and the output shaft of the wire feeding motor (3-8) passes through the forming fixing plate (3-9),A wire feeding driving wheel (3-14) is fixedly installed at the shaft end, a pressure wheel (3-15) is installed on the outer side of the forming fixed plate (3-9) and arranged above the wire feeding driving wheel (3-14), a forming pressure wheel (3-10) is installed in the vertical long groove of the forming fixed plate (3-9) through a forming pressure wheel shaft (3-11), the forming pressure wheel (3-10) is installed at the right end of the forming pressure wheel shaft (3-11), an adjusting nut (3-7) passes through the upper side of the forming fixed plate (3-9) and is connected to the forming pressure wheel shaft (3-11), and a slide groove (3-20) is installed on the lower support plate (3-6), the pitch adjustment motor (3-4) is horizontally installed on the left part of the upper side of the lower support plate (3-6), and a gear (3-18) is installed on the output shaft to mesh with the rack (3-19). The rack (3-19) is installed in the slide groove (3-20) and passes through the square hole at the upper right corner of the forming fixed plate (3-9). The pitch adjustment rod (3-16) is fixed to the right end of the rack (3-19). The lower cutter (3-12) is fixed to the lower part of the outer side of the forming fixed plate (3-9), and the upper cutter (3-13) is fixed to the right end of the forming pressure wheel shaft (3-11).

2. The 3D printing head for construction with interlayer reinforcement material according to claim 1, characterized in that: The cement mortar extrusion mechanism (1) comprises an extrusion motor (1-1), an upper support (1-2), a bearing (1-3), a fixed shaft sleeve (1-4), a feed port (1-5), an auger (1-6), a cylinder (1-7), a connecting platform (1-8), a print width adjustment motor (1-9), a crank (1-10), a connecting rod (1-11), a baffle (1-12) and a discharge nozzle (1-13). The upper support (1-2) is fixed to the upper end of the cylinder (1-7). The extrusion motor (1-1) is vertically fixed on the upper support (1-2). The output shaft of the extrusion motor (1-1) is fixedly connected to the fixed shaft sleeve (1-4). The fixed shaft sleeve (1-4) is installed in the upper support (1-2) through the bearing (1-3). The auger (1-6) is installed at the lower end of the fixed shaft sleeve (1-4). The side of the cylinder (1-7) is provided with a feed port (1-5). A discharge nozzle (1-13) is provided at the lower end of the cylinder (1-7); a print width adjustment motor (1-9) is horizontally mounted on a platform on one side of the lower part of the cylinder (1-7); a crank (1-10) is mounted on the output shaft of the print width adjustment motor (1-9); the other end of the crank (1-10) is connected to a connecting rod (1-11) via a rotating shaft; the other end of the connecting rod (1-11) is connected to a baffle (1-12) via a rotating shaft; the baffle (1-12) is mounted on both sides of the lower end of the discharge nozzle (1-13) via a rotating shaft; the print width adjustment motor (1-9), the crank (1-10), the connecting rod (1-11) and the baffle (1-12) form a cement mortar extrusion width adjustment mechanism; two sets of cement mortar extrusion width adjustment mechanisms are symmetrically arranged on both sides of the lower part of the cylinder (1-7); a connecting platform (1-8) is provided in the middle of the outer side of the cylinder (1-7).

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