A cylinder moving device for a multi-station metal 3D printer

Abstract

The application relates to the technical field of metal additive manufacturing, in particular to a cylinder moving device for a multi-station metal 3D printer, which comprises a first mounting seat, a plurality of groups of first guide rollers for conveying forming cylinders are arranged on the first mounting seat, a driving unit for driving a plurality of groups of the first guide rollers to rotate synchronously, and a control unit for controlling the movement of the forming cylinders, the plurality of groups of the first guide rollers are arranged in a linear array, a cylinder lifting unit for lifting the forming cylinders on the first guide rollers is arranged on the first mounting seat, and a conveying guide unit for preventing the transmission direction of the forming cylinders from being skewed is arranged on the first mounting seat. Through cooperation of the first guide rollers, the cylinder lifting unit, the conveying guide unit and the control unit, the purpose of stably transmitting the forming cylinders between two stations after the forming cylinders are controlled to be separated from a forming chamber is achieved, and the accuracy of the transmission position is ensured, so that the transmission is stable and accurate, and the device is convenient to use.

Description

Technical Field

[0001] This application relates to the field of metal additive manufacturing technology, and in particular to a cylinder moving device for a multi-station metal 3D printer. Background Technology

[0002] For some 3D printing equipment with ultra-long stroke, the height of the printed products is usually large, and there are cases where the height of the product is greater than the height of the forming chamber. Therefore, when performing the part retrieval operation, a part retrieval position is usually set up on one side of the forming position. That is, after the product is printed in the forming position, the forming cylinder is first removed from the forming chamber, and then the forming cylinder is transported as a whole to the part retrieval position for part retrieval. After the part retrieval is completed, the forming cylinder is moved back to the forming position for subsequent printing.

[0003] For the aforementioned 3D printing equipment, the movement of the forming cylinder mainly involves two directions: vertical lifting to approach or move away from the forming chamber, and horizontal movement to enter the part-removal position or the printing position. Based on the aforementioned movement process of the forming cylinder, how to ensure the accuracy of the forming cylinder's transmission position while ensuring stable transmission between the two positions has become a technical problem that urgently needs to be solved in the current field. Utility Model Content

[0004] In order to ensure the stability of the forming cylinder between two stations while ensuring the accuracy of the forming cylinder's transmission position, this application provides a cylinder moving device for a multi-station metal 3D printer.

[0005] This application provides a cylinder moving device for a multi-station metal 3D printer, which adopts the following technical solution: A cylinder moving device for a multi-station metal 3D printer includes a first mounting base. The first mounting base is provided with a plurality of first guide rollers for conveying forming cylinders, a drive unit for driving the plurality of first guide rollers to rotate synchronously, and a control unit for controlling the movement of forming cylinders. The plurality of first guide rollers are arranged in a linear array. The first mounting base is provided with a cylinder lifting unit for lifting the forming cylinders on the first guide rollers and a conveying guide unit for preventing the transmission direction of the forming cylinders from being skewed.

[0006] By adopting the above technical solution, during use, only one set of cylinder moving devices needs to be set up at each of the two workstations. The cylinder lifting unit can drive the forming cylinder to leave the forming chamber and place it on the first guide roller. Then, the drive unit drives the first guide roller to rotate to realize the transmission of the forming cylinder. After that, the control unit controls the forming cylinder to move to the corresponding workstation and stop, so as to achieve precise control of the transmission position of the forming cylinder. At the same time, with the cooperation of the conveying and guiding unit, it is ensured that the moving direction of the forming cylinder does not deviate. The whole operation is simple and convenient, and the transmission is more stable.

[0007] Preferably, the first mounting base includes a base plate and two vertical plates disposed on the base plate, the two vertical plates being disposed at intervals on the base plate, the first guide roller being located between the two vertical plates, and one end of the first guide roller being rotatably connected to one of the vertical plates, the other end of the first guide roller being rotatably connected to the other vertical plate, and a support and guide structure being provided on the base plate, the support and guide structure being used to support the middle part of the first guide roller in the axial direction and guide it to rotate stably.

[0008] By adopting the above technical solution, during use, the cooperation of the vertical plate and the supporting guide structure ensures the smooth rotation of the first guide roller and the stability of its installation, reducing the possibility of downward bending deformation of the first guide roller after bearing pressure at the middle position of the axial direction.

[0009] Preferably, the drive unit includes a first driven sprocket coaxially fixedly connected to one end of the first guide roller, a transmission chain for driving the driven sprockets on two adjacent first guide rollers to rotate synchronously, a first drive motor disposed on the base plate, a drive sprocket coaxially disposed on the output shaft of the first drive motor, a second driven sprocket disposed at one end of one of the first guide rollers, and a drive chain wound around the drive sprocket and the second driven sprocket.

[0010] By adopting the above technical solution, in use, through the cooperation of the drive sprocket, the first driven sprocket, the second driven sprocket, the drive chain, and the transmission chain, when the output shaft of the first drive motor rotates, the purpose of driving all the first guide rollers to rotate synchronously is achieved, thereby realizing the transmission of the forming cylinder.

[0011] Preferably, the control unit includes a limit switch disposed on the first mounting base and a positioning block for cooperating with the limit switch contacts, the positioning block being mounted on the forming cylinder.

[0012] By adopting the above technical solution, when the forming cylinder moves to the corresponding position, the positioning block on the forming cylinder abuts against the contact of the limit switch, thereby controlling the drive unit to stop running by the limit switch, thus controlling the forming cylinder to stay at the corresponding work position, so as to ensure the normal operation of subsequent printing or part picking.

[0013] Preferably, the cylinder lifting unit includes several sets of screw jacks mounted on the base plate, top blocks mounted on the lifting shafts of the screw jacks, and a drive assembly mounted on the base plate. The screw jacks are arranged in a rectangular pattern, the top blocks are located in the area between two adjacent first guide rollers, and the drive assembly is used to drive the lifting shafts of the several sets of screw jacks to lift synchronously.

[0014] By adopting the above technical solution, during use, several rectangularly distributed spiral lifters drive the top block to rise and abut against the forming cylinder, thereby raising the forming cylinder to separate it from the first guide roller and connect it to the forming chamber, thus ensuring the normal operation of subsequent printing operations.

[0015] Preferably, the drive assembly includes a second drive motor mounted on the base plate, a transmission shaft for connecting the input shafts of two adjacent screw jacks, and a gear commutator mounted on the base plate, wherein the gear commutator is used to connect two vertically arranged transmission shafts together, and the second drive motor is used to drive the transmission shaft to rotate.

[0016] By adopting the above technical solution, when in use, two transmission shafts with different axes are connected together by a gear reversing device, so that the output shaft of the second drive motor drives multiple transmission shafts to rotate synchronously, thereby driving multiple screw jacks to start synchronously. The overall use is simple and convenient.

[0017] Preferably, the top block is provided with a number of balls for abutting against the forming cylinder. The balls are arranged at intervals.

[0018] By adopting the above technical solution, the ball bearings ensure smoother transmission during the horizontal transmission of the forming cylinder and also provide support for the lifting process of the forming cylinder.

[0019] Preferably, the conveying and guiding unit includes a plurality of second mounting seats arranged in a linear array on the vertical plate, and a second guide roller rotatably mounted on the second mounting seat. The axial direction of the second guide roller is perpendicular to the axial direction of the first guide roller, and the axial direction of the second guide roller is perpendicular to the transmission direction of the forming cylinder.

[0020] By adopting the above technical solution, when in use, the coordinated use of several second guide rollers can guide and limit the transmission direction of the forming cylinder without affecting its horizontal transmission, so as to prevent deviation during the transmission process.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The forming cylinder is driven to detach from the forming chamber and placed on the first guide roller by the cylinder lifting unit. Then, the first guide roller is driven to rotate by the drive unit to realize the transmission of the forming cylinder. After that, the control unit controls the forming cylinder to move to the corresponding station and stop, so as to achieve precise control of the transmission position of the forming cylinder. At the same time, with the cooperation of the conveying and guiding unit, it is ensured that the movement direction of the forming cylinder does not deviate. The whole operation is simple and convenient, and the transmission is more stable. 2. By coordinating the drive sprocket, the first driven sprocket, the second driven sprocket, the drive chain, the transmission chain, the first drive motor, and the limit switch, multiple first guide rollers are driven synchronously, thereby achieving accurate control of the transmission position of the forming cylinder while ensuring stable and smooth horizontal transmission of the forming cylinder. 3. By using two vertical plates and a supporting guide structure in combination, the first guide roller can be stably rotated while also being supported in the middle part of the first guide roller in the axial direction, thus reducing the possibility of downward bending deformation when the middle part of the first guide roller is subjected to pressure. Attached Figure Description

[0022] Figure 1 This is an isometric schematic diagram of the main overall structure in Embodiment 1 of this application; Figure 2 This is an isometric schematic diagram of the auxiliary transmission component structure, which is the main feature of Embodiment 1 of this application. Figure 3 This is an isometric schematic diagram of the main supporting and guiding structure in Embodiment 1 of this application; Figure 4 This is an isometric schematic diagram of the main drive unit structure in Embodiment 1 of this application; Figure 5 yes Figure 2 The image mainly shows a magnified view of part A of the structure. Figure 6 This is an isometric schematic diagram of the cylinder lifting unit structure, which is the main feature of Embodiment 1 of this application. Figure 7 This is a schematic diagram illustrating the lifting guide structure in Embodiment 1 of this application; Figure 8 This is an isometric schematic diagram showing the installation position of the limit switch in Embodiment 2 of this application.

[0023] Reference numerals: 1. First mounting base; 11. Base plate; 12. Vertical plate; 13. Clearance hole; 2. First guide roller; 3. Drive unit; 31. First driven sprocket; 32. Transmission chain; 33. First drive motor; 34. Drive sprocket; 35. Second driven sprocket; 36. Drive chain; 4. Cylinder lifting unit; 41. Screw jack; 42. Top block; 43. Drive assembly; 431. Second drive motor; 432. Transmission shaft; 433. Gearbox ; 44. Ball bearing; 45. Lifting platform fixing plate; 5. Conveying guide unit; 51. Second mounting base; 52. Second guide roller; 53. Rubber sleeve; 6. Supporting guide structure; 61. Vertical plate; 62. Supporting roller; 7. Limit switch; 8. Auxiliary transmission assembly; 81. Third guide roller; 82. Fixing plate; 9. Lifting guide structure; 91. Mounting frame; 92. First fixing block; 93. Guide column; 94. Second fixing block; 10. Anchoring element; 20. Hard rubber block. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail.

[0025] This application discloses a cylinder moving device for a multi-station metal 3D printer.

[0026] Example 1: Reference Figure 1 A cylinder moving device for a multi-station metal 3D printer includes a first mounting base 1, which includes a base plate 11 and two vertical plates 12. The two vertical plates 12 are parallel to each other and spaced apart on the base plate 11. A first guide roller 2 is arranged between the two vertical plates 12. Multiple first guide rollers 2 are arranged and evenly distributed along the length of the vertical plates 12. The two ends of each first guide roller 2 are rotatably connected to a vertical plate 12. A drive unit 3 and a control unit are also arranged on the base plate 11. In use, the forming cylinder is located on the first guide roller 2. The drive unit 3 controls the multiple first guide rollers 2 to rotate synchronously, thereby realizing the transmission of the forming cylinder. When the forming cylinder is transmitted to the printing position or the part picking position, the control unit controls the drive unit 3 to stop running, and controls the forming cylinder to stop for subsequent operations.

[0027] Reference Figure 1 and Figure 2 In this embodiment, a square clearance hole 13 is also provided on the base plate 11. At the same time, several first guide rollers 2 directly above the clearance hole 13 are replaced with two sets of symmetrically arranged auxiliary transmission components 8. The transmission direction of the first guide rollers 2 is parallel to the length direction of the clearance hole 13. The two sets of auxiliary transmission components 8 are arranged at intervals on both sides of the clearance hole 13 along the axial direction of the first guide rollers 2. Each set of auxiliary transmission components 8 is composed of several third guide rollers 81. The axis of the third guide rollers 81 is parallel to the axis of the first guide rollers 2. In this embodiment, there are two third guide rollers 81. The distance between the two third guide rollers 81, the distance between adjacent third guide rollers 81, and the distance between two adjacent third guide rollers 81 are all equal. A fixing plate 82 is fixedly provided on the base plate 11. The fixing plate 82 is arranged parallel to the vertical plate 12. One end of the third guide roller 81 is rotatably connected to the fixing plate 82, and the other end of the third guide roller 81 is rotatably connected to a vertical plate 12.

[0028] Reference Figure 1 and Figure 2In use, the fixed plate 82 and the third guide roller 81 form a through area directly above the clearance hole 13, so that when the forming cylinder moves to the area directly above the clearance hole 13, the external driving component can pass through the clearance hole 13 and extend into the forming cylinder to control the movement of the piston plate inside the forming cylinder; at the same time, several third guide rollers 81 cooperate with the first guide roller 2 to form support for the forming cylinder in the corresponding area above the clearance hole 13, ensuring the normal transmission of the forming cylinder afterwards.

[0029] Reference Figure 2 and Figure 3 In this application, the length of the first guide roller 2 is greater than the bottom length of the forming cylinder. When the forming cylinder is placed on the first guide roller 2, in order to reduce the downward bending deformation of the middle position of the first guide roller 2 axis under stress, a support guide structure 6 is also provided on the base plate 11. The support guide structure 6 is used to provide support for the middle part of the first guide roller 2 and guide its stable transmission. The number of support guide structures 6 is the same as the number of first guide rollers 2, and the positions of the support guide structures correspond one-to-one. The support guide structure 6 includes two sets of vertical plates 61 arranged opposite to each other, and support rollers 62 rotating on the vertical plates 61. Each vertical plate 61 is provided with two support rollers 62, and the two support rollers 62 are symmetrically arranged on both sides of the first guide roller 2. The outer wall of the support roller 62 abuts against the outer wall of the first guide roller 2, and the rotation axis of the support roller 62 is parallel to the axis of the first guide roller 2. In use, the middle part of the first guide roller 2 is supported by four support rollers 62, and the support rollers 62 themselves can rotate without affecting the rotation of the first guide roller 2, which is more conducive to use.

[0030] Reference Figure 1 and Figure 4 The drive unit 3 is used to control the synchronous rotation of the first guide roller 2 and the third guide roller 81. The drive unit 3 includes a first driven sprocket 31, a transmission chain 32, a first drive motor 33, a drive sprocket 34, a second driven sprocket 35, and a drive chain 36. In this embodiment, the first drive motor 33 is a geared motor. The first drive motor 33 is mounted on the base plate 11. The drive sprocket 34 is coaxially connected to the output shaft of the first drive motor 33. Two first driven sprockets 31 are coaxially fixedly connected to one end of any first guide roller 2. A first driven sprocket 31 is also coaxially mounted to one end of any third guide roller 81. The transmission chain 32 cooperates with the two adjacent first driven sprockets 31 to form a chain drive.

[0031] Reference Figure 1 and Figure 4The two adjacent first guide rollers 2, the adjacent first guide rollers 2 and third guide rollers 81, and the two adjacent third guide rollers 81 are all synchronously driven by a chain drive structure. A second driven sprocket 35 is coaxially fixed at one end of one of the first guide rollers 2. The drive chain 36, the second driven sprocket 35, and the drive sprocket 34 cooperate to form a chain drive structure. In use, the first drive motor 33 drives the drive sprocket 34 to rotate. Under the action of the drive chain 36, the drive sprocket 34 rotates, driving the second driven sprocket 35 synchronously. The steps rotate, thereby achieving the purpose of driving all the first guide rollers 2 and the third guide rollers 81 to rotate synchronously under the cooperation of several sets of first driven sprockets 31 and transmission chains 32, thus realizing the transmission of the forming cylinder; in addition, a clamping member 10 is also installed on the vertical plate 12 to prevent the transmission chain 32 from falling. In this embodiment, the clamping member 10 is set as an arc-shaped clamping block, and the outer wall of the arc-shaped clamping block is smooth; in other embodiments, an abutting sprocket can also be used, which meshes with the transmission chain 32 to ensure that the transmission chain 32 is in a tensioned state.

[0032] Reference Figure 2 The control unit includes limit switches 7 and positioning blocks. In this embodiment, there are two limit switches 7, which are symmetrically arranged on both sides of the clearance hole 13. The contact height of the limit switches 7 should be higher than the outer wall height of the first guide roller 2. The number of positioning blocks is the same as the number of limit switches 7. The positioning blocks are installed at the bottom of the forming cylinder. When in use, the forming cylinder is driven on the first guide roller 2. When the two positioning blocks at the bottom of the forming cylinder simultaneously abut the contacts of the two limit switches 7, the limit switches 7 control the first drive motor 33 to stop running. At this time, the forming cylinder stays at the printing position or the picking position for subsequent operations.

[0033] Reference Figure 2 and Figure 5To prevent the forming cylinder from deviating during transmission, a conveying guide unit 5 is provided on the first mounting base 1. Two sets of conveying guide units 5 are provided, and the two sets of conveying guide units 5 are symmetrically arranged on both sides of the length direction of the first guide roller 2. The conveying guide unit 5 includes a second mounting base 51 and a second guide roller 52. Several second mounting bases 51 are provided, and the several second mounting bases 51 are evenly spaced along the length direction of the vertical plate 12. In this embodiment, at least one second mounting base 51 is provided between every two adjacent first guide rollers 2. The number of second guide rollers 52 is the same as the number of second mounting bases 51 and corresponds one-to-one. The second guide rollers 52 rotate on the second mounting bases 51, and the axis direction of the second guide rollers 52 is parallel to the vertical direction, that is, the axis direction of the second guide rollers 52 is perpendicular to the transmission direction of the forming cylinder. At the same time, a rubber sleeve 53 made of rubber material is provided on the outer wall of the second guide rollers 52. The rubber sleeve 53 abuts against the side wall of the forming cylinder, making the transmission of the forming cylinder more stable.

[0034] Reference Figure 1 and Figure 6 After the forming cylinder moves to the printing position, in order to connect the forming cylinder with the forming chamber for printing, a cylinder lifting unit 4 is also provided on the first mounting base 1. The cylinder lifting unit 4 is used to lift the forming cylinder to the bottom and disengage it from the first guide roller 2, while the top of the forming cylinder is connected to the forming chamber. The cylinder lifting unit 4 includes a screw jack 41, a top block 42 and a drive assembly 43. Several screw jacks 41 are provided, and the screw jacks 41 are spaced apart on the base plate 11. Each screw jack 41 is bolted to the base plate 11 through a lifting fixing plate 45. In this embodiment, four screw jacks 41 are preferably provided, and the four screw jacks 41 are arranged in a rectangular array around the clearance hole 13.

[0035] Reference Figure 1 and Figure 6 The number of top blocks 42 is the same as the number of screw jacks 41 and corresponds one-to-one. The top blocks 42 are fixed on the lifting shaft of the screw jacks 41. The top blocks 42 are located in the distribution gap between the first guide roller 2 and the third guide roller 81. Several balls 44 are rotatably arranged on each top block 42. The balls 44 are spaced apart on the upper surface of the top block 42. The spherical surface of the balls 44 is used to abut the bottom of the forming cylinder. In this embodiment, four balls 44 are arranged on one top block 42. The four balls 44 are arranged in a rectangular shape. In the initial state, the highest point of the balls 44 should not be higher than the highest point of the side wall of the first guide roller 2. The drive assembly 43 is used to drive the lifting rods of several screw jacks 41 to lift synchronously, thereby driving the top blocks 42 and balls 44 to lift synchronously. Then, the balls 44 support the forming cylinder to achieve the purpose of driving the forming cylinder to lift.

[0036] Reference Figure 1and Figure 6 The drive assembly 43 includes a second drive motor 431, a drive shaft 432, and a gear commutator 433. The drive shaft 432 is used to coaxially connect the input shafts of adjacent screw jacks 41 whose input shafts are on the same straight line. The drive shaft 432 and the input shaft of the screw jack 41 are connected by a coupling, that is, both ends of the drive shaft 432 are connected to the corresponding input shaft of the screw jack 41 through a coupling. The gear commutator 433 is located at the corner of the clearance groove, and the gear commutator 433 is connected to the drive shaft 431. 2. The four rectangularly distributed screw jacks 41 are linked together. The output shaft of the second drive motor 431 is coaxially connected to a transmission shaft 432 to drive the transmission shaft 432. In use, through the cooperation of the second drive motor 431, the transmission shaft 432, the coupling and the gear reversing device 433, the lifting rods of the four screw jacks 41 can be driven to extend synchronously from the gap between the first guide roller 2 and the third guide roller 81, thereby lifting the forming cylinder placed on the first guide roller 2. It is simple and convenient to use.

[0037] Reference Figure 1 and Figure 7 In addition, to ensure the stability of the forming cylinder during the lifting process, a lifting guide structure 9 is also provided on the first mounting base 1. Two sets of lifting guide structures 9 are provided, and the two sets of lifting guide structures 9 are symmetrically arranged on both sides of the length direction of the first guide roller 2. The lifting guide structure 9 includes a mounting bracket 91 fixed to the base plate 11, a first fixing block 92 fixed to the top of the mounting bracket 91, a guide post 93 located on the bottom surface of the first fixing block 92 away from the mounting bracket 91, and a second fixing block 94. The guide post 93 is vertically downward and located away from the first fixing block 94. One end of the second fixing block 94 is tapered, and a guide hole is provided on the second fixing block 94 for the guide post 93 to pass through. In use, the second fixing block 94 is simply installed on the side wall of the forming cylinder. As the forming cylinder moves, when the forming cylinder moves to the printing position, the second fixing block 94 is located below the first fixing block 92, and at this time the axis of the guide hole coincides with the axis of the guide post 93. As the forming cylinder is lifted, the second fixing block 94 is moved upward, and the guide post 93 is gradually inserted into the guide hole. Thus, the lifting process of the forming cylinder is limited by the cooperation of the guide hole and the guide post 93.

[0038] The implementation principle of this application embodiment is as follows: In use, only one set of cylinder moving devices needs to be set at the printing position and the picking position, and the transmission direction of the two sets of cylinder moving devices should be the same, and the interval should not be greater than the distance between two adjacent first guide rollers 2. Then, the forming cylinder can be placed on the first guide roller 2 in the picking position. As the output shaft of the first drive motor 33 rotates, the first guide roller 2 rotates synchronously, thereby gradually driving the forming cylinder to the printing position. When the positioning block at the bottom of the forming cylinder touches the contact of the limit switch 7, the limit switch 7 controls the first drive motor 33 to stop running. At this time, the forming cylinder is located directly above the clearance hole 13, and the guide hole and the guide post 93 are aligned. Then, the second drive motor is controlled. The output shaft of motor 431 rotates, driving the lifting shafts of several screw jacks 41 to rise synchronously. With the cooperation of ball bearings 44, the forming cylinder is lifted, and the guide post 93 is inserted into the guide hole until the top of the forming cylinder is connected to the forming chamber for printing. After printing, the output shaft of the second drive motor 431 rotates in the opposite direction, causing the lifting shafts of several screw jacks 41 to fall synchronously. Under the action of gravity, the forming cylinder gradually falls until it is placed back on the first guide roller 2. Then, the first drive motor 33 runs in the opposite direction to move the forming cylinder from the printing position to the picking position, so that the worker can pick up the part. After picking up the part, the above steps are repeated to achieve cyclic printing and picking.

[0039] Example 2: Reference Figure 8 The difference between this embodiment and the first embodiment is that in this embodiment, the limit switch 7 is set at one end of the vertical plate 12 along its length, and the top block 42 is set on the side wall of the forming cylinder. The contact of the limit switch 7 is set horizontally toward the forming cylinder. That is, when the forming cylinder is in motion, after the top block 42 touches the contact, the limit switch 7 can control the first drive motor 33 to stop running, thereby stopping the forming cylinder from moving. At the same time, a hard rubber block 20 is also set on one side of the corresponding position of the limit switch 7. The hard rubber block 20 is used to abut against and limit the movement of the forming cylinder.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cylinder moving device for a multi-station metal 3D printer, characterized in that: The first mounting base (1) is provided with a plurality of first guide rollers (2) for conveying the forming cylinder, a drive unit (3) for driving the plurality of first guide rollers (2) to rotate synchronously, and a control unit for controlling the movement of the forming cylinder. The plurality of first guide rollers (2) are arranged in a linear array. The first mounting base (1) is provided with a cylinder lifting unit (4) for lifting the forming cylinder on the first guide roller (2) and a conveying guide unit (5) for preventing the transmission direction of the forming cylinder from deviating.

2. The cylinder moving device for a multi-station metal 3D printer according to claim 1, characterized in that: The first mounting base (1) includes a base plate (11) and two vertical plates (12) disposed on the base plate (11). The two vertical plates (12) are disposed at intervals on the base plate (11). The first guide roller (2) is located between the two vertical plates (12), and one end of the first guide roller (2) is rotatably connected to one of the vertical plates (12), and the other end of the first guide roller (2) is rotatably connected to the other vertical plate (12). The base plate (11) is also provided with a support and guide structure (6), which is used to support the middle part of the first guide roller (2) in the axial direction and guide it to rotate stably.

3. The cylinder moving device for a multi-station metal 3D printer according to claim 2, characterized in that: The drive unit (3) includes a first driven sprocket (31) coaxially fixedly connected to one end of the first guide roller (2), a transmission chain (32) for driving the driven sprockets on two adjacent first guide rollers (2) to rotate synchronously, a first drive motor (33) mounted on the base plate (11), a drive sprocket (34) coaxially mounted on the output shaft of the first drive motor (33), a second driven sprocket (35) mounted at one end of one of the first guide rollers (2), and a drive chain (36) wound around the drive sprocket (34) and the second driven sprocket (35).

4. The cylinder moving device for a multi-station metal 3D printer according to claim 1, characterized in that: The control unit includes a limit switch (7) disposed on the first mounting base (1) and a positioning block for cooperating with the contacts of the limit switch (7), the positioning block being mounted on the forming cylinder.

5. The cylinder moving device for a multi-station metal 3D printer according to claim 2, characterized in that: The cylinder lifting unit (4) includes several sets of screw jacks (41) set on the base plate (11), top blocks (42) set on the lifting shaft of the screw jacks (41), and drive components (43) set on the base plate (11). The screw jacks (41) are arranged in a rectangular shape. The top blocks (42) are set in the area between two adjacent first guide rollers (2). The drive components (43) are used to drive the lifting shafts of the screw jacks (41) to lift synchronously.

6. The cylinder moving device for a multi-station metal 3D printer according to claim 5, characterized in that: The drive assembly (43) includes a second drive motor (431) mounted on the base plate (11), a transmission shaft (432) for connecting the input shafts of two adjacent screw jacks (41), and a gear commutator (433) mounted on the base plate (11). The gear commutator (433) is used to connect two vertically arranged transmission shafts (432) together, and the second drive motor (431) is used to drive the transmission shafts (432) to rotate.

7. The cylinder moving device for a multi-station metal 3D printer according to claim 5, characterized in that: The top block (42) is provided with rolling balls (44) for abutting against the forming cylinder. There are several balls (44) and the balls (44) are spaced apart.

8. The cylinder moving device for a multi-station metal 3D printer according to claim 2, characterized in that: The conveying and guiding unit (5) includes a plurality of second mounting seats (51) arranged in a linear array on the vertical plate (12) and a second guide roller (52) rotatably arranged on the second mounting seat (51). The axial direction of the second guide roller (52) is perpendicular to the axial direction of the first guide roller (2), and the axial direction of the second guide roller (52) is perpendicular to the transmission direction of the forming cylinder.

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