3D printing equipment for metal surface machining

Abstract

The invention relates to the technical field of 3D printing, in particular to 3D printing equipment for metal surface machining, which comprises a base, the top of the base is fixedly connected with a storage table top, the top of the base is fixedly connected with a protective cover, the inner wall of the protective cover is fixedly connected with a sliding rail, and a printing assembly is mounted on the sliding rail. According to the 3D colored drawing device, through the arranged knocking and centering structure, before 3D colored drawing is conducted on a metal circular plate, the metal circular plate can be directly placed on the top of the storage table top with the front face facing upwards, four telescopic rods synchronously extend, the knocking and centering structure and a push plate jointly push the metal circular plate, and the metal circular plate is pushed to the middle of the storage table top; the knocking and centering structure continuously knocks the metal circular plate in the pushing process, so that the position of the metal circular plate is continuously adjusted in the centering process, the efficiency of the metal circular plate in the centering process is higher, the centered metal circular plate does not incline, and subsequent 3D colored drawing does not deviate.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing device for metal surface machining. Background Art

[0002] Metal surface painting is a popular decorative technique in recent years. Through flat carving or relief carving on the metal surface, patterns and patterns that blend with the city's humanistic customs, historical culture, landscape features, etc., the metal round plate is given a new visual experience with color. The patterns on the metal surface painting are different from those on the metal round plate. This pattern is designed by computer and printed by advanced means such as 3D printing. It is more solid and gorgeous. Most of the printed patterns are circular metal plate decorative structures, which can be used for various decorations.

[0003] In the prior art, before printing the metal circular plate, it is necessary to place the metal circular plate in a corresponding position, and then use a 3D printer to perform 3D painting on the metal circular plate. Since the metal circular plate is heavy, it is troublesome to manually center the metal circular plate, and the centering degree is difficult to control, which makes it easy to offset during subsequent 3D painting. In addition, different installation molds need to be replaced for square metal circular plates and round metal circular plates, which is troublesome to operate. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a 3D printing device for metal surface machining.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A 3D printing device for metal surface machining, comprising a base, a storage table fixedly connected to the top of the base, a protective cover fixedly connected to the top of the base, a sliding track fixedly connected to the inner wall of the protective cover, a printing component installed on the sliding track, an annular correction frame rotatably connected to the top of the base, four evenly distributed telescopic rods fixedly connected to the annular correction frame, two of which are fixedly connected to push plates, and the other two telescopic rods are fixedly connected to knocking centering structures, the two knocking centering structures are symmetrical parts to each other, the two push plates are symmetrically distributed to each other, the bottom of each of the telescopic rods is evenly fixedly connected to a distance sensor, and the base is fixedly connected to a first motor for driving the annular correction frame to rotate.

[0006] The camming mechanism is a structure in which the at least one end of the base block is engaged with the drive means, the at least one end of the base block being connected to the drive means, the at least one end of the base block being connected to the drive means and the at least one end of the base block being connected to the drive means.

[0007] Furthermore, the reciprocating drive structure includes a rotating wheel, the center of which is fixedly connected to the output shaft of the second motor, the surface of the rotating wheel near the edge is fixedly connected to a limit pin, the outer wall of the limit pin is slidably connected to a sliding frame, the end of the connecting rod near the sliding frame is fixedly connected to a positioning pin, the connecting rod is slidably connected to the inside of the sliding frame through the set positioning pin, the inner wall of the sliding frame is fixedly connected to two partition plates for separating the limit pin and the sliding frame, the top of the base block is fixedly connected to two sliding rods arranged perpendicular to the sliding frame, the sliding rods are slidably connected to the sliding frame, and the top of the base block is fixedly connected to two spring plates for pushing the connecting rod toward the extension block.

[0008] Furthermore, the locking structure includes a trapezoidal block, the inner wall of the side slider is provided with a movable groove, the outer wall of the side slider of the movable groove close to the first spring is provided with a plurality of branch grooves, the inner wall of each branch groove is slidably connected with a trapezoidal block, the outer wall of the trapezoidal block close to the movable groove is fixedly connected with a branch traction rope, a main traction rope is arranged inside the movable groove, one end of the branch traction rope is fixedly connected to the outer wall of the main traction rope, and the inner wall of the branch groove is rotatably connected with a roller for guiding the branch traction rope.

[0009] Furthermore, two symmetrically distributed installation grooves are provided on the inner side of each of the branch grooves, and a second spring is fixedly connected to the inner wall of the installation groove to push the trapezoidal block in a direction away from the supporting traction rope.

[0010] Furthermore, a connecting groove is provided on the inner wall of the extension block, and the connecting groove extends to the interior of the side slider and is connected to one end of the movable groove. A lever is provided inside the connecting groove, and a fulcrum is fixedly connected to the middle of the lever, and both ends of the fulcrum are rotatably connected to the inner wall of the connecting groove. The end of the lever close to the movable groove is fixedly connected to the main traction rope, and the end of the lever away from the main traction rope is fixedly connected to a pressure block, and the pressure block is located on the outside of the extension block.

[0011] Furthermore, the annular correction frame includes an outer ring and an inner ring, both of which are fixedly connected to the outer wall of the telescopic rod, the inner side of the outer ring is rotatably connected to a mounting ring via a bearing, the lower end of the mounting ring is fixedly connected to the top of the base, the outer wall of the outer ring is fixedly connected to a plurality of teeth, the output shaft of the first motor is fixedly connected to a gear plate, and the outer wall of the gear plate is meshed with the teeth.

[0012] Furthermore, a limiting groove is provided on the outer wall of the outer ring, a limiting column is fixedly connected to the top of the base, the limiting column is slidably connected to the inner wall of the limiting groove, and the angle between the two end points of the limiting groove and the center of the outer ring is ninety degrees.

[0013] Compared with the existing technology, the present invention has the following beneficial effects: 1. The reciprocating drive structure is driven by the second motor to rotate the rotating wheel, and the limit pins and the positioning pins slide inside the sliding frame. The rotating wheel drives the sliding frame to slide forward and backward along the sliding rod, so that the two connecting rods rotate along the rotating shaft, and the two rubber columns continuously hit the metal circular plate. When the metal circular plate deflects to one side, the rubber column on that side will hit the edge of the metal circular plate during the reciprocating motion, so that the offset side of the metal circular plate is subjected to force, and then one side of the metal circular plate moves slightly. Under continuous impact, the position of the metal circular plate can be continuously corrected; 2. Both sides of the base block are slidably connected with side sliders, which can be adjusted on the base block according to the different metal discs, so that the rubber column can hammer the surface of the metal disc more closely under the drive of the reciprocating drive structure, thereby achieving a higher centering efficiency for both square and round metal discs; 3. The distance sensor can detect the distance between the telescopic rod and the metal circular plate, so as to judge whether the metal circular plate is centered. If it is not centered, it will be centered again. The first motor drives the annular correction frame to rotate 90 degrees as a whole, and then measures the distance between the telescopic rod and the metal circular plate. By comparing with the previous set of data, it can be detected whether the measurement result of the distance sensor is accurate. Regular automatic detection is performed to ensure the reliability of the centering of the metal circular plate. To summarize, the present invention provides a knocking centering structure, so that before the metal circular plate is 3D painted, the metal circular plate can be placed directly on the top of the storage table with its front side facing upward, and the four telescopic rods are extended synchronously, so that the knocking centering structure and the push plate jointly push the metal circular plate to the middle of the storage table, and the knocking centering structure continuously knocks on the metal circular plate during the pushing process, so that the metal circular plate continuously adjusts its position during the centering process, so that the metal circular plate is more efficient during the centering process, and the metal circular plate is not crooked after being centered, so that the subsequent 3D painting will not be offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a schematic cross-sectional view of the structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the annular correction frame of the present invention; Figure 5 2 is a schematic diagram of the three-dimensional structure of the knock centering structure of the present invention; Figure 6 It is a structural schematic diagram of the knocking centering structure of the present invention in another direction; Figure 7 It is a partial cutaway schematic diagram of the knock centering structure of the present invention; Figure 8 The present invention Figure 1 A schematic diagram of the structure enlargement at the center A; Fig. 9 The present invention Figure 2 A schematic diagram of the structure enlarged at B in the middle; Fig.10 The present invention Figure 5 A schematic diagram of the structure enlarged at C in the middle; Fig.11 The present invention Figure 7 Enlarged schematic diagram of the structure at D in the middle.

[0015] In the figure: 1, base; 2, storage table; 3, annular correction frame; 4, telescopic rod; 5, first motor; 6, gear plate; 7, sliding track; 8, printing component; 9, protective cover; 10, knock centering structure; 11, push plate; 12, distance sensor; 13, second motor; 14, base block; 15, side slide; 16, first spring; 17, extension block; 18, pressure block; 19, connecting rod; 20, elastic plate; 21, rubber column; 22, rotating Wheel; 23, limit pin; 24, slide frame; 25, spring piece; 26, slide rod; 27, connecting groove; 28, fulcrum; 29, lever; 30, movable groove; 31, slide groove; 32, branch groove; 33, roller; 34, main traction rope; 35, branch traction rope; 36, installation groove; 37, second spring; 38, trapezoidal block; 39, outer ring; 40, installation ring; 41, teeth; 42, limit groove; 43, limit column; 44, inner ring; 45, top block. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Reference Figure 1-Figure 11 A 3D printing device for metal surface machining, a base 1, a storage table 2 is fixedly connected to the top of the base 1, a protective cover 9 is fixedly connected to the top of the base 1, a sliding track 7 is fixedly connected to the inner wall of the protective cover 9, a printing component 8 is installed on the sliding track 7, an annular correction frame 3 is rotatably connected to the top of the base 1, four evenly distributed telescopic rods 4 are fixedly connected to the annular correction frame 3, two of the telescopic rods 4 are fixedly connected to push plates 11, and the other two telescopic rods 4 are fixedly connected to knocking centering structures 10, the two knocking centering structures 10 are symmetrical parts to each other, and the two push plates 11 are symmetrically distributed to each other. The bottom of each telescopic rod 4 is evenly fixedly connected to a distance sensor 12, and the base 1 is fixedly connected to a first motor 5 for driving the annular correction frame 3 to rotate.

[0019] Specifically, the present invention provides a knocking centering structure 10, so that before the metal circular plate is 3D painted, the metal circular plate can be placed directly on the top of the storage table 2 with its front side facing upward, and the four telescopic rods 4 are extended synchronously, so that the knocking centering structure 10 and the push plate 11 jointly push the metal circular plate to the middle of the storage table 2. The knocking centering structure 10 continuously knocks on the metal circular plate during the pushing process, so that the metal circular plate continuously adjusts its position during the centering process, so that the metal circular plate is more efficient during the centering process, and the centered metal circular plate is not crooked, so that the subsequent 3D painting will not be offset.

[0020] Preferably, the knocking centering structure 10 includes a base block 14, and the outer walls on both sides of the base block 14 are slidably connected with side sliders 15, and a slide groove 31 is provided on the side of the side slider 15 close to the base block 14, and the end of the base block 14 is slidably connected to the inner wall of the slide groove 31, and the outer wall of the end of the side slider 15 away from the telescopic rod 4 is fixedly connected with an extension block 17, and a groove for accommodating the extension block 17 is provided on the base block 14, and the end of the side slider 15 close to the extension block 17 is fixedly connected with a top block 45, and the depth of the groove is greater than or equal to the sum of the widths of the extension block 17 and the side slider 15, and the extension block 17 close to the base block 14 A first spring 16 is fixedly connected to an outer wall on one side, and one end of the first spring 16 away from the extension block 17 is fixedly connected to the base block 14. The top of the side slider 15 is rotatably connected to a connecting rod 19. The inside of the base block 14 is fixedly connected to a second motor 13, and a reciprocating drive structure is fixedly connected to the output shaft of the second motor 13. One end of the connecting rod 19 is connected to the reciprocating drive structure, and one end of the connecting rod 19 away from the reciprocating drive structure is fixedly connected to an elastic plate 20, and one end of the elastic plate 20 away from the connecting rod 19 is rotatably connected to a rubber column 21, and a locking structure is installed on the side of the side slider 15 close to the connecting rod 19.

[0021] Specifically, both sides of the base block 14 are slidably connected with side sliders 15, and the connecting rod 19 is rotatably connected to the side sliders 15. When the square metal disc is centered, the extension block 17 will be squeezed during the contact with the metal disc, and the extension block 17 will be stored in the inner side of the groove. The side slider 15 also slides accordingly, so that the rubber column 21 can more closely hammer the surface of the square metal disc driven by the reciprocating drive structure. When the circular metal disc is centered, the extension block 17 will be squeezed during the contact with the metal disc, but the extension block 17 always fits the arc surface of the circular metal disc, and the side slider 15 slides a small distance accordingly, so that the rubber column 21 can more closely hammer the surface of the circular metal disc driven by the reciprocating drive structure. The locking structure will lock the position of the side slider 15 after the circular metal disc fits the extension block 17 to prevent the position of the side slider 15 from being affected by the movement of the reciprocating drive structure, thereby achieving a higher centering effect for both the square metal disc and the circular metal disc.

[0022] Preferably, the reciprocating drive structure includes a rotating wheel 22, the center of which is fixedly connected to the output shaft of the second motor 13, the surface of the rotating wheel 22 near the edge is fixedly connected to a limit pin 23, the outer wall of the limit pin 23 is slidably connected to a sliding frame 24, and the end of the connecting rod 19 near the sliding frame 24 is fixedly connected to a positioning pin, the connecting rod 19 is slidably connected to the inside of the sliding frame 24 through the set positioning pin, and the inner wall of the sliding frame 24 is fixedly connected to two partition plates for separating the limit pin 23 and the sliding frame 24, and the top of the base block 14 is fixedly connected to two sliding rods 26 arranged perpendicular to the sliding frame 24, the sliding rods 26 are slidably connected to the sliding frame 24, and the top of the base block 14 is fixedly connected to two spring plates 25 for pushing the connecting rod 19 toward the extension block 17. After the second motor 13 stops rotating, the elastic force of the spring plate 25 can push the connecting rod 19 to keep the rubber column 21 away from the metal circular plate, so as to avoid the rubber column 21 affecting the metal circular plate during the retraction of the telescopic rod 4.

[0023] Specifically, the reciprocating drive structure is driven by the second motor 13, so that the rotating wheel 22 rotates, the limiting pins 23 and the positioning pins slide inside the sliding frame 24, and the rotating wheel 22 drives the sliding frame 24 to slide back and forth along the sliding rod 26, so that the two connecting rods 19 rotate along the rotating axis, so that the two rubber columns 21 continuously hit the metal circular plate. When the metal circular plate deviates to one side, the rubber column 21 on this side will hit the edge of the metal circular plate during reciprocating motion, so that the offset side of the metal circular plate is subjected to force, and then one side of the metal circular plate moves slightly. Under continuous impact, the position of the metal circular plate can be continuously corrected.

[0024] Preferably, the locking structure includes a trapezoidal block 38, a movable groove 30 is provided on the inner wall of the side slider 15, and a plurality of branch grooves 32 are provided on the outer wall of the side slider 15 of the movable groove 30 close to the first spring 16, and the inner wall of each branch groove 32 is slidably connected with a trapezoidal block 38, and a branch traction rope 35 is fixedly connected to the outer wall of the trapezoidal block 38 close to the movable groove 30, and a main traction rope 34 is arranged inside the movable groove 30, and one end of the branch traction rope 35 is fixedly connected to the outer wall of the main traction rope 34, and the inner wall of the branch groove 32 is rotatably connected with a roller 33 for guiding the branch traction rope 35, and two symmetrically distributed mounting grooves are provided on the inner side of each branch groove 32 36, the inner wall of the mounting groove 36 is fixedly connected with a second spring 37 that pushes the trapezoidal block 38 in a direction away from the supporting traction rope 35, the inner wall of the extension block 17 is provided with a connecting groove 27, the connecting groove 27 extends to the interior of the side slider 15 and is connected to one end of the movable groove 30, a lever 29 is arranged inside the connecting groove 27, a fulcrum 28 is fixedly connected to the middle part of the lever 29, and both ends of the fulcrum 28 are rotatably connected to the inner wall of the connecting groove 27, one end of the lever 29 close to the movable groove 30 is fixedly connected to the main traction rope 34, and one end of the lever 29 away from the main traction rope 34 is fixedly connected to the pressure block 18, and the pressure block 18 is located on the outer side of the extension block 17.

[0025] Specifically, before the base block 14 contacts the metal circular plate, the pressing block 18 on the extension block 17 will first contact the metal circular plate, so that the pressing block 18 drives the connecting rod 19 to rotate along the fulcrum 28 under pressure, so that the other end of the fulcrum 28 pulls the main traction rope 34, and the main traction rope 34 pulls the branch traction rope 35 to move, so that the branch traction rope 35 drives the trapezoidal block 38 to slide along the branch groove 32. After the top block 45 is compressed and the trapezoidal block 38 is retracted into the groove, the lock between the base block 14 and the side slider 15 is released, the force on the pressing block 18 is reduced, and the trapezoidal block 38 extends out of the branch groove 32 again under the elastic force of the second spring 37. The side slider 15 cannot shrink toward the direction of the telescopic rod 4, and at the same time, the side slider 15 is pressed against the metal circular plate, thereby making it impossible for the base block 14 and the side slider 15 to move.

[0026] Preferably, the annular correction frame 3 includes an outer ring 39 and an inner ring 44, both of which are fixedly connected to the outer wall of the telescopic rod 4, the inner side of the outer ring 39 is rotatably connected to a mounting ring 40 through a bearing, the lower end of the mounting ring 40 is fixedly connected to the top of the base 1, the outer wall of the outer ring 39 is fixedly connected to a plurality of teeth 41, the output shaft of the first motor 5 is fixedly connected to a gear plate 6, the outer wall of the gear plate 6 is meshed with the teeth 41, a limiting groove 42 is provided on the outer wall of the outer ring 39, the top of the base 1 is fixedly connected to a limiting column 43, and the limiting column 43 and the limiting groove The inner wall of 42 is slidably connected, and the angle between the two end points of the limit groove 42 and the center of the outer ring 39 is ninety degrees. The setting of the distance sensor 12 can detect the distance between the telescopic rod 4 and the metal circular plate, so as to judge whether the metal circular plate is centered. If it is not centered, it is centered again. Under the drive of the first motor 5, the annular correction frame 3 is driven to rotate ninety degrees as a whole, and then the distance between the telescopic rod 4 and the metal circular plate is measured. Compared with the previous set of data, it can be detected whether the measurement result of the distance sensor 12 is accurate, and regular automatic detection is performed to ensure the reliability of the centering of the metal circular plate.

[0027] Working principle: When in use, place the metal circular plate on the storage table 2, and after it is centered by the annular correction frame 3, the sliding track 7 drives the printing assembly 8 to move, and the printing assembly 8 paints the surface of the metal circular plate. Specifically, the four telescopic rods 4 extend synchronously, so that the knocking centering structure 10 and the push plate 11 jointly push the metal circular plate to the middle of the storage table 2. The two sides of the base block 14 are slidably connected to the side sliders 15, and the connecting rod 19 is rotatably connected to the side sliders 15. When the square metal circular plate is centered, the extension block 17 will be squeezed during the contact with the metal circular plate, and the extension block 17 is received in the inner side of the groove, and the side slider 15 also slides accordingly, so that the rubber column 21 can hammer the surface of the square metal disc more closely under the drive of the reciprocating drive structure. When the circular metal disc is centered, the extension block 17 will be squeezed in the process of contact with the metal disc, but the extension block 17 always fits the arc surface of the circular metal disc, and the side slider 15 slides a small distance accordingly, so that the rubber column 21 can hammer the surface of the circular metal disc more closely under the drive of the reciprocating drive structure, and the locking structure will lock the position of the side slider 15 after the circular metal disc fits the extension block 17. , to prevent the position of the side slider 15 from being affected by the movement of the reciprocating drive structure, so as to achieve a higher centering effect for both the square metal disc and the circular metal disc. The reciprocating drive structure is driven by the second motor 13 to rotate the rotating wheel 22, and the limit pins 23 and the positioning pins slide inside the sliding frame 24. The rotating wheel 22 drives the sliding frame 24 to slide back and forth along the sliding rod 26, so that the two connecting rods 19 rotate along the rotating shaft, so that the two rubber columns 21 continuously knock on the metal disc. When the metal disc deviates to one side, the rubber column 21 on that side will knock on the edge of the metal disc during the reciprocating motion, so that the metal disc The offset side of the plate is subjected to force, which causes one side of the metal circular plate to move slightly. Under continuous impact, the position of the metal circular plate can be continuously corrected. The setting of the distance sensor 12 can detect the distance between the telescopic rod 4 and the metal circular plate, so as to judge whether the metal circular plate is centered. If it is not centered, it is centered again. Under the drive of the first motor 5, the annular correction frame 3 is driven to rotate ninety degrees as a whole, and then the distance between the telescopic rod 4 and the metal circular plate is measured. Compared with the previous set of data, it can be detected whether the measurement result of the distance sensor 12 is accurate, and regular automatic detection is performed to ensure the reliability of the centering of the metal circular plate.

[0028] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0029] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A 3D printing device for metal surface machining, comprising a base (1), a storage table (2) fixedly connected to the top of the base (1), a protective cover (9) fixedly connected to the top of the base (1), a sliding track (7) fixedly connected to the inner wall of the protective cover (9), a printing assembly (8) installed on the sliding track (7), characterized in that: The top of the base (1) is rotatably connected to an annular correction frame (3), and the annular correction frame (3) is fixedly connected to four evenly distributed telescopic rods (4), two of which are fixedly connected to push plates (11), and the other two telescopic rods (4) are fixedly connected to knock centering structures (10), the two knock centering structures (10) are symmetrical parts to each other, the two push plates (11) are symmetrically distributed to each other, and the bottom of each telescopic rod (4) is evenly fixedly connected to a distance sensor (12), and the base (1) is fixedly connected to a first motor (5) for driving the annular correction frame (3) to rotate.

2. A 3D printing device for metal surface machining according to claim 1, characterized in that: The knocking centering structure (10) comprises a base block (14), the outer walls of both sides of the base block (14) are slidably connected to side sliders (15), a side of the side slider (15) close to the base block (14) is provided with a slide groove (31), the end of the base block (14) is slidably connected to the inner wall of the slide groove (31), an outer wall of one end of the side slider (15) away from the telescopic rod (4) is fixedly connected to an extension block (17), a groove for accommodating the extension block (17) is provided on the base block (14), a top block (45) is fixedly connected to one end of the side slider (15) close to the extension block (17), and a first spring (45) is fixedly connected to the outer wall of one side of the extension block (17) close to the base block (14). 16), one end of the first spring (16) away from the extension block (17) is fixedly connected to the base block (14), the top of the side slider (15) is rotatably connected to a connecting rod (19), the inside of the base block (14) is fixedly connected to a second motor (13), the output shaft of the second motor (13) is fixedly connected to a reciprocating drive structure, one end of the connecting rod (19) is connected to the reciprocating drive structure, one end of the connecting rod (19) away from the reciprocating drive structure is fixedly connected to an elastic plate (20), one end of the elastic plate (20) away from the connecting rod (19) is rotatably connected to a rubber column (21), and a locking structure is installed on the side of the side slider (15) close to the connecting rod (19).

3. A 3D printing device for metal surface machining according to claim 2, characterized in that: The reciprocating drive structure comprises a rotating wheel (22), the center of the rotating wheel (22) is fixedly connected to the output shaft of the second motor (13), the surface of the rotating wheel (22) near the edge is fixedly connected to a limit pin (23), the outer wall of the limit pin (23) is slidably connected to a slide frame (24), one end of the connecting rod (19) near the slide frame (24) is fixedly connected to a positioning pin, the connecting rod (19) is slidably connected to the inside of the slide frame (24) through the provided positioning pin, the inner wall of the slide frame (24) is fixedly connected to two partition plates for separating the limit pin (23) and the slide frame (24), the top of the base block (14) is fixedly connected to two slide rods (26) arranged perpendicular to the slide frame (24), the slide rods (26) are slidably connected to the slide frame (24), and the top of the base block (14) is fixedly connected to two spring plates (25) for pushing the connecting rod (19) toward the extension block (17).

4. A 3D printing device for metal surface machining according to claim 2, characterized in that: The locking structure comprises a trapezoidal block (38), an inner wall of the side slider (15) is provided with a movable groove (30), an outer wall of the side slider (15) of the movable groove (30) close to the first spring (16) is provided with a plurality of branch grooves (32), the inner wall of each branch groove (32) is slidably connected to a trapezoidal block (38), an outer wall of the trapezoidal block (38) close to the movable groove (30) is fixedly connected to a branch traction rope (35), a main traction rope (34) is arranged inside the movable groove (30), one end of the branch traction rope (35) is fixedly connected to the outer wall of the main traction rope (34), and the inner wall of the branch groove (32) is rotatably connected to a roller (33) for guiding the branch traction rope (35).

5. A 3D printing device for metal surface machining according to claim 4, characterized in that: Two symmetrically distributed mounting grooves (36) are provided on the inner side of each of the branch grooves (32), and a second spring (37) is fixedly connected to the inner wall of the mounting groove (36) for pushing the trapezoidal block (38) in a direction away from the supporting traction rope (35).

6. A 3D printing device for metal surface machining according to claim 5, characterized in that: The inner wall of the extension block (17) is provided with a connecting groove (27), the connecting groove (27) extending into the interior of the side slider (15) and communicating with one end of the movable groove (30), a lever (29) being arranged inside the connecting groove (27), a fulcrum (28) being fixedly connected to the middle of the lever (29), both ends of the fulcrum (28) being rotatably connected to the inner wall of the connecting groove (27), one end of the lever (29) close to the movable groove (30) being fixedly connected to a main traction rope (34), and one end of the lever (29) away from the main traction rope (34) being fixedly connected to a pressure block (18), the pressure block (18) being located outside the extension block (17).

7. The 3D printing device for metal surface machining according to claim 1, characterized in that: The annular correction frame (3) comprises an outer ring (39) and an inner ring (44), the outer ring (39) and the inner ring (44) are both fixedly connected to the outer wall of the telescopic rod (4), the inner side of the outer ring (39) is rotatably connected to a mounting ring (40) via a bearing, the lower end of the mounting ring (40) is fixedly connected to the top of the base (1), the outer wall of the outer ring (39) is fixedly connected to a plurality of teeth (41), the output shaft of the first motor (5) is fixedly connected to a gear plate (6), and the outer wall of the gear plate (6) is meshed with the teeth (41).

8. The 3D printing device for metal surface machining according to claim 7, characterized in that: The outer wall of the outer ring (39) is provided with a limiting groove (42), the top of the base (1) is fixedly connected to a limiting column (43), the limiting column (43) is slidably connected to the inner wall of the limiting groove (42), and the angle between the two end points of the limiting groove (42) and the center of the outer ring (39) is ninety degrees.

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