Displacement-free conveying line for metal 3D printing parts

Abstract

The invention discloses a metal 3D printing part displacement-free conveying line, and belongs to the technical field of metal laser powder bed melting conveying equipment. And the conveying line mechanism is arranged on one side of the metal 3D printing mechanism, and the conveying line mechanism comprises a transfer station, a first conveying belt, a roller workbench and a second conveying belt. According to the displacement-free conveying line for the metal 3D printing parts, by means of the conveying line mechanism, the problem that the formed parts are carried by workers is solved, the workers do not need to carry the formed parts back and forth any more, the man-machine engineering design is better met, the workers are prevented from bending down and twisting continuously during carrying, and the possibility of spine fatigue and injury of the operators is reduced; and the problem that the production progress is affected due to falling or errors in the carrying process is prevented, so that the production efficiency is improved, a production line is operated to promote automation of equipment layout, the production efficiency is improved due to automation, labor force is released, and an operator can operate more equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal laser powder bed fusion transportation equipment, and specifically relates to a displacement-free transportation line for metal 3D printed parts. Background Art

[0002] Metal 3D printing has gradually become one of the important processing means in the traditional processing field. Metal 3D printing includes a variety of processes, among which wire-based metal additive manufacturing and powder-based metal additive manufacturing have developed well.

[0003] Currently, the better-developed energy sources are lasers and electron beams. The process of printing parts using metal laser powder bed fusion technology means importing a designed 3D model, and then in a space with a low oxygen content (argon space / nitrogen space, mainly argon space in the industry), layer-by-layer stacking is carried out on the substrate through a laser, and layer-by-layer forming is carried out until the 3D model is completed, that is, the printing is completed and the part is formed. Different from traditional processing, the printed parts are all designed with internal flow channels, so internal cleaning is also required to clean the powder remaining inside the parts. Therefore, it is necessary to transfer them to a powder cleaning device for powder cleaning. Subsequently, other treatments are carried out according to relevant process requirements. After the treatment is completed, the substrate is separated from the formed part, and the whole part is completed.

[0004] Currently, most domestic main industries are mainly 3D printing equipment. With the large increase in the demand of the upstream industry, large-scale equipment, medium-scale equipment, and small-scale equipment have gradually been distinguished. Even after such subdivision, the equipment is still mainly single machines. Therefore, the transportation of metal 3D printed formed parts is a shortcoming in the current development.

[0005] Currently, the production line after the formed parts are taken out has not been popularized. Currently, the formed parts are transported by operators or transported using a forklift with a fixture. During the transportation process, the substrate is generally clamped and fixed for transportation by the fixture. In this way, once an error occurs during the transportation process, there is a high risk that the formed parts may fall during the transportation process, affecting the stability of the transportation. Summary of the Invention

[0006] The purpose of the present invention is to solve the problem of personnel carrying formed parts through the use of a conveyor line mechanism. Personnel no longer need to carry them back and forth, which is more in line with ergonomic design, avoids personnel constantly bending and twisting during transportation, reduces the possibility of spinal fatigue and injury of operators, and prevents falling off or mistakes during transportation, thereby affecting production progress, thereby improving production efficiency. The operation of the production line promotes the automation of equipment layout, and automation increases production efficiency, releases labor, and allows operators to operate more equipment. Through the use of a powder cleaning mechanism, a fully enclosed design is achieved, reducing the direct contact between powder cleaning personnel and powder, and flipping while rotating to achieve all-round powder cleaning. At the same time, the powder is absorbed so that the powder will not be lifted for a long time and the powder cleaning process can be observed more clearly.

[0007] The technical solution adopted by the present invention is as follows: a metal 3D printed parts displacement-free conveying line, comprising:

[0008] Metal 3D printing mechanism;

[0009] A conveyor line mechanism is provided at one side of the metal 3D printing mechanism, the conveyor line mechanism comprises a transfer station, a first conveyor belt, a roller workbench and a second conveyor belt, the transfer station is installed at one side of the metal 3D printing mechanism, the first conveyor belt is installed at one side of the transfer station, the roller workbench is installed at one side of the first conveyor belt, and the second conveyor belt is installed at one side of the roller workbench; and

[0010] A powder cleaning mechanism is arranged on one side of the second conveyor belt and is used for cleaning the internal powder of the parts. The powder cleaning mechanism includes a clamping component, a transmission component, a collecting component, an inner cleaning cylinder, a closing cover and a powder collector. The inner cleaning cylinder is installed on one side of the second conveyor belt, and both sides of the top of the inner cleaning cylinder are provided with through openings. The closing cover is rotatably connected to the inner cleaning cylinder, and both sides of the inner cleaning cylinder are provided with connecting openings. The clamping component is arranged on the inner cleaning cylinder, the transmission component is arranged on the inner cleaning cylinder, and the transmission component is connected to the clamping component. The powder collector is fixedly connected to the center of the bottom of the inner cleaning cylinder, and the collecting component is arranged on the powder collector.

[0011] Wherein, the clamping component comprises:

[0012] A rotating assembly is provided on the inner cleaning cylinder to control the rotation of the finished parts;

[0013] A suspension assembly is arranged on the inner cleaning cylinder, and the suspension assembly is connected to the rotating assembly;

[0014] A positioning assembly is arranged in the rotating assembly;

[0015] There are two telescopic components, both of which are arranged on the position adjustment component to adjust according to the size of the finished parts; and

[0016] There are two flipping and clamping components, and each flipping and clamping component is arranged on each telescopic component to flip the finished parts.

[0017] Among them, the rotating component includes a rotating motor and a rotating suspension rod. A mounting frame is fixedly connected to the top of the inner cleaning cylinder. The rotating motor is fixedly connected to the mounting frame. The rotating suspension rod is rotatably connected to the inner top of the inner cleaning cylinder, and the rotating suspension rod is fixedly connected to the output end of the rotating motor.

[0018] Among them, the suspension component includes two suspension blocks and a suspension groove. The two suspension blocks are respectively fixedly connected to both sides of the top of the rotating suspension rod. The suspension groove is opened at the top of the inner cleaning cylinder, and the two suspension blocks are both rotatably connected in the suspension groove.

[0019] Among them, the position adjustment component includes a position adjustment motor, a bidirectional screw rod and two moving rods. The bidirectional screw rod is rotatably connected in the rotating suspension rod. The position adjustment motor is fixedly connected to one end of the rotating suspension rod, and the output end of the position adjustment motor is fixedly connected to one end of the bidirectional screw rod. The two moving rods are both slidably connected in the rotating suspension rod, and the two moving rods are both threadedly connected to the bidirectional screw rod.

[0020] Among them, each telescopic component includes a position adjustment cylinder and a telescopic rod. The position adjustment cylinder is fixedly connected in the moving rod. The telescopic rod is movably connected in the moving rod, and the telescopic rod is fixedly connected to the output end of the position adjustment cylinder.

[0021] Among them, each flipping and clamping component includes a flipping motor and a clamping plate. The flipping motor is fixedly connected to the bottom of the telescopic rod. The clamping plate is rotatably connected to the bottom of the telescopic rod, and the clamping plate is fixedly connected to the output end of the flipping motor.

[0022] Among them, the transmission component includes a linkage component, a follower gear ring and a driving gear. The follower gear ring is fixedly connected to the top of the closed cover. The driving gear is fixedly connected to the output end of the rotating motor. The linkage component is arranged on the mounting frame.

[0023] Among them, the linkage component includes a height adjustment cylinder and a transmission gear. The height adjustment cylinder is fixedly connected to the mounting frame. The transmission gear is rotatably connected to the output end of the height adjustment cylinder.

[0024] Among them, the collection component includes a feed hopper and a sieve. The feed hopper is fixedly connected to the top of the powder collector. The sieve is fixedly connected to the bottom of the feed hopper.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0026] (1) In the present invention, the problem of personnel carrying molded parts is solved by using a conveyor line mechanism. Personnel no longer need to carry parts back and forth, which is more in line with ergonomic design and avoids personnel constantly bending and twisting during transportation, reducing the possibility of spinal fatigue and injury of operators, and preventing problems such as falling off or mistakes during transportation that affect production progress, thereby improving production efficiency. Operating the production line promotes the automation of equipment layout, which increases production efficiency, releases labor, and allows operators to operate more equipment.

[0027] (2) In the present invention, a fully enclosed design is achieved by using a powder cleaning mechanism, which reduces direct contact between the powder cleaning personnel and the powder. In addition, the machine can be turned over while rotating to achieve all-round powder cleaning. At the same time, the powder is absorbed so that the powder will not be raised for a long time and the powder cleaning process can be observed more clearly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A perspective view of the present invention;

[0029] Figure 2 It is a cross-sectional exploded view of the powder cleaning mechanism of the present invention;

[0030] Figure 3 It is a partial cross-sectional view of the powder cleaning mechanism of the present invention;

[0031] Figure 4 It is a three-dimensional diagram of the transmission component of the present invention;

[0032] Figure 5 An exploded view of the clamping component of the present invention;

[0033] Figure 6 It is a three-dimensional diagram of the clamping component of the present invention.

[0034] Markings in the figure: 1. Metal 3D printing mechanism; 2. Transfer station; 3. First conveyor belt; 4. Roller workbench; 5. Second conveyor belt; 6. Powder cleaning mechanism; 601. Height adjustment cylinder; 602. Mounting frame; 603. Closing cover; 604. Inner cleaning cylinder; 605. Connecting port; 606. Rotating motor; 607. Driving gear; 608. Follower gear ring; 609. Transmission gear; 610. Rotating suspension rod; 611. Bidirectional screw; 612. Positioning cylinder; 613. Clamp; 614. Flipping motor; 615. Feed hopper; 616. Screen; 617. Powder collector; 618. Moving rod; 619. Telescopic rod; 620. Positioning motor; 621. Suspension block; 622. Through port; 623. Suspension slot. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Example 1. Refer to Figure 1-6 : A displacement-free transportation line for metal 3D printed parts, comprising:

[0037] A metal 3D printing mechanism 1;

[0038] A transportation line mechanism, provided on one side of the metal 3D printing mechanism 1. The transportation line mechanism includes a transfer station 2, a first conveyor belt 3, a roller workbench 4, and a second conveyor belt 5. The transfer station 2 is installed on one side of the metal 3D printing mechanism 1. The first conveyor belt 3 is installed on one side of the transfer station 2. The roller workbench 4 is installed on one side of the first conveyor belt 3. The second conveyor belt 5 is installed on one side of the roller workbench 4; and

[0039] A powder cleaning mechanism 6, provided on one side of the second conveyor belt 5 for internal powder cleaning of the parts. The powder cleaning mechanism 6 includes a clamping component, a transmission component, a collection component, an internal cleaning cylinder 604, a closed cover 603, and a powder collector 617. The internal cleaning cylinder 604 is installed on one side of the second conveyor belt 5, and through openings 622 are provided on both sides of the top of the internal cleaning cylinder 604. The closed cover 603 is rotatably connected to the internal cleaning cylinder 604, and communication ports 605 are provided on both sides of the internal cleaning cylinder 604. The clamping component is provided on the internal cleaning cylinder 604. The transmission component is provided on the internal cleaning cylinder 604 and is connected to the clamping component. The powder collector 617 is fixedly connected to the center of the inner bottom of the internal cleaning cylinder 604. The collection component is provided on the powder collector 617.

[0040] In this implementation: The parts printed by the metal 3D printing mechanism 1 are placed on the transfer station 2 for external powder cleaning. After cleaning, they are transported to the roller workbench 4 through the first conveyor belt 3. The first conveyor belt 3 has a guide plate to ensure that the formed parts can be stably transported to the roller workbench 4. Finally, they are transported to the powder cleaning mechanism 6 through the second conveyor belt 5 for internal cleaning of the formed parts. The closed cover 603 rotates on the top of the internal cleaning cylinder 604. Through the docking and misalignment of the through openings 622 and the communication ports 605, the opening and closing of the internal cleaning cylinder 604 are realized to ensure the safety of internal use. The powder collector 617 performs negative pressure collection to suck the powder on the parts under negative pressure to avoid dust emission.

[0041] Specifically: The clamping component includes:

[0042] A rotating assembly, provided on the internal cleaning cylinder 604 for controlling the rotation of the finished parts;

[0043] A suspension assembly is provided on the inner cleaning cylinder 604, and the suspension assembly is connected to the rotating assembly;

[0044] An adjustment component is provided inside the rotating component;

[0045] There are two sets of telescopic components, and both sets of telescopic components are provided on the adjustment component for adjusting according to the size of the finished parts; and

[0046] There are two sets of flipping clamping components, and each set of flipping clamping components is provided on each set of telescopic components for flipping the finished parts.

[0047] In this embodiment: The rotating assembly, the suspension assembly, the adjustment component, the telescopic component and the flipping clamping component cooperate with each other to complete the clamping and flipping use of the parts.

[0048] Specifically: The rotating assembly includes a rotating motor 606 and a rotating suspension rod 610. A mounting bracket 602 is fixedly connected to the top of the inner cleaning cylinder 604. The rotating motor 606 is fixedly connected to the mounting bracket 602. The rotating suspension rod 610 is rotatably connected to the inner top of the inner cleaning cylinder 604, and the rotating suspension rod 610 is fixedly connected to the output end of the rotating motor 606.

[0049] In this embodiment: The model of the rotating motor 606 can be selected from the existing ones on the market according to needs, and will not be elaborated here. The rotating suspension rod 610 is controlled by the rotating motor 606 to rotate to complete the angle adjustment of the whole piece.

[0050] Specifically: The suspension assembly includes two suspension blocks 621 and a suspension groove 623. The two suspension blocks 621 are respectively fixedly connected to both sides of the top of the rotating suspension rod 610. The suspension groove 623 is opened at the top of the inner cleaning cylinder 604. The two suspension blocks 621 are both rotatably connected to the suspension groove 623.

[0051] In this embodiment: The two suspension blocks 621 and the suspension groove 623 cooperate with each other to complete the suspension use of the rotating suspension rod 610 and ensure the use.

[0052] Specifically: The adjustment component includes an adjustment motor 620, a bidirectional screw 611 and two moving rods 618. The bidirectional screw 611 is rotatably connected inside the rotating suspension rod 610. The adjustment motor 620 is fixedly connected to one end of the rotating suspension rod 610, and the output end of the adjustment motor 620 is fixedly connected to one end of the bidirectional screw 611. The two moving rods 618 are both slidably connected inside the rotating suspension rod 610, and the two moving rods 618 are both threadedly connected to the bidirectional screw 611.

[0053] In this embodiment: The model of the position adjustment motor 620 can be selected from those available on the market according to needs, and will not be elaborated here. By controlling the rotation of the bidirectional screw 611 with the position adjustment motor 620, the two moving rods 618 are moved within the rotating suspension rod 610. Moreover, the rotation motor 606 can rotate in two opposite directions.

[0054] Specifically: Each set of telescopic components includes a position adjustment cylinder 612 and a telescopic rod 619. The position adjustment cylinder 612 is fixedly connected inside the moving rod 618, the telescopic rod 619 is movably connected inside the moving rod 618, and the telescopic rod 619 is fixedly connected to the output end of the position adjustment cylinder 612.

[0055] In this embodiment: The model of the position adjustment cylinder 612 can be selected from those available on the market according to needs, and will not be elaborated here. By controlling the telescopic movement of the telescopic rod 619 with the position adjustment cylinder 612, the height adjustment of the parts is completed to ensure normal use.

[0056] Specifically: Each set of flipping and clamping components includes a flipping motor 614 and a clamping plate 613. The flipping motor 614 is fixedly connected to the bottom of the telescopic rod 619, the clamping plate 613 is rotatably connected to the bottom of the telescopic rod 619, and the clamping plate 613 is fixedly connected to the output end of the flipping motor 614.

[0057] In this embodiment: The model of the flipping motor 614 can be selected from those available on the market according to needs, and will not be elaborated here. By controlling the rotation of the clamping plate 613 with the flipping motor 614, the flipping of the parts is completed, and the clamping plate 613 can be adjusted correspondingly according to the parts to complete stable clamping.

[0058] Specifically: The transmission components include a linkage assembly, a follower gear ring 608, and a driving gear 607. The follower gear ring 608 is fixedly connected to the top of the closed cover 603, the driving gear 607 is fixedly connected to the output end of the rotation motor 606, and the linkage assembly is arranged on the mounting frame 602.

[0059] In this embodiment: The follower gear ring 608 and the driving gear 607 cooperate with each other to complete the power output of the rotation motor 606.

[0060] Specifically: The linkage assembly includes a height adjustment cylinder 601 and a transmission gear 609. The height adjustment cylinder 601 is fixedly connected to the mounting frame 602, and the transmission gear 609 is rotatably connected to the output end of the height adjustment cylinder 601.

[0061] In this embodiment: The model of the height adjustment cylinder 601 can be selected from those available on the market according to needs, and will not be elaborated here. By controlling the height of the transmission gear 609 with the height adjustment cylinder 601, the transmission gear 609 is meshed with the follower gear ring 608 and the driving gear 607 to complete the use.

[0062] Specifically, the collecting component includes a feeding hopper 615 and a sieve 616. The feeding hopper 615 is fixedly connected to the top of the powder collector 617, and the sieve 616 is fixedly connected to the bottom of the feeding hopper 615.

[0063] In this embodiment: The feeding hopper 615 and the sieve 616 cooperate with each other to achieve the collection of the cleaned powder, ensuring the use. Inside the feeding hopper 615, the installed placement structure completes the placement of the parts, ensuring the use.

[0064] During use, the parts completed by the metal 3D printing mechanism 1 are placed on the transfer station 2 for cleaning the external powder. After the cleaning is completed, they are conveyed to the roller workbench 4 through the first conveyor belt 3, and finally sent to the powder cleaning mechanism 6 through the second conveyor belt 5 for internal cleaning of the formed parts. During the internal cleaning, the lifting cylinder 601 controls the lowering of the transmission gear 609, so that the transmission gear 609 meshes with the follower gear ring 608 and the driving gear 607. The rotating motor 606 controls the rotation of the driving gear 607. At the same time, the transmission gear 609 and the follower gear ring 608 cause the closed cover 603 to rotate, completing the dislocation of the communication port 605 and the through port 622, and realizing the sealing of the top of the inner cleaning cylinder 604. After the sealing, the lifting cylinder 601 contracts to disengage the transmission gear 609, avoiding the rotation and opening of the closed cover 603 during powder cleaning. The positioning cylinder 612 extends to align the clamping plate 613 with the part. The positioning motor 620 controls the rotation of the bidirectional screw 611, causing the two moving rods 618 to approach each other, so that the clamping plate 613 is docked with the part to complete the positioning. During powder cleaning, the rotating motor 606 controls the rotation of the rotating suspension rod 610. At the same time, the flipping motor 614 rotates and flips the part while cleaning the powder inside the part. The powder collector 617 adsorbs the powder to complete the powder collection.

[0065] The control mode of the present invention is controlled by manually starting and closing the switch. The wiring diagram of the power element and the power supply are common knowledge in the art. And the present invention is mainly used to protect the mechanical device, so the control mode and wiring layout of the present invention will not be explained in detail.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A displacement-free conveying line for metal 3D printed parts, characterized in that: include: Metal 3D printing mechanism (1); A conveyor line mechanism is arranged on one side of a metal 3D printing mechanism (1), the conveyor line mechanism comprising a transfer station (2), a first conveyor belt (3), a roller worktable (4) and a second conveyor belt (5), the transfer station (2) being installed on one side of the metal 3D printing mechanism (1), the first conveyor belt (3) being installed on one side of the transfer station (2), the roller worktable (4) being installed on one side of the first conveyor belt (3), and the second conveyor belt (5) being installed on one side of the roller worktable (4); and A powder cleaning mechanism (6) is arranged on one side of the second conveyor belt (5) and is used for cleaning the powder inside the parts. The powder cleaning mechanism (6) comprises a clamping component, a transmission component, a collecting component, an inner cleaning cylinder (604), a closing cover (603) and a powder collector (617). The inner cleaning cylinder (604) is installed on one side of the second conveyor belt (5), and both sides of the top of the inner cleaning cylinder (604) are provided with openings (622). The closing cover (603) is rotatably connected to the inner cleaning cylinder (604), and both sides of the inner cleaning cylinder (604) are provided with connecting openings (605). The clamping component is arranged on the inner cleaning cylinder (604), the transmission component is arranged on the inner cleaning cylinder (604), and the transmission component is connected to the clamping component. The powder collector (617) is fixedly connected to the center of the bottom of the inner cleaning cylinder (604), and the collecting component is arranged on the powder collector (617).

2. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The clamping member comprises: A rotating assembly is provided on the inner cleaning cylinder (604) to control the rotation of the finished parts; A suspension component is disposed on the inner cleaning cylinder (604), and the suspension component is connected to the rotating component; A positioning assembly is arranged in the rotating assembly; Telescopic components, which are provided in two groups, and both groups of telescopic components are provided on the positioning component to adjust according to the size of the finished parts; and The flipping and clamping components are provided with two groups, and each group of the flipping and clamping components is arranged on each group of telescopic components for flipping the finished parts.

3. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The rotating assembly comprises a rotating motor (606) and a rotating suspension rod (610); the top of the inner cleaning barrel (604) is fixedly connected to a mounting frame (602); the rotating motor (606) is fixedly connected to the mounting frame (602); the rotating suspension rod (610) is rotatably connected to the top of the inner cleaning barrel (604); and the rotating suspension rod (610) is fixedly connected to the output end of the rotating motor (606).

4. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The suspension assembly comprises two suspension blocks (621) and a suspension groove (623); the two suspension blocks (621) are respectively fixedly connected to two sides of the top of the rotating suspension rod (610); the suspension groove (623) is opened at the top of the inner cleaning cylinder (604); and the two suspension blocks (621) are both rotatably connected in the suspension groove (623).

5. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The positioning assembly comprises a positioning motor (620), a bidirectional screw (611) and two moving rods (618); the bidirectional screw (611) is rotatably connected to the rotating suspension rod (610); the positioning motor (620) is fixedly connected to one end of the rotating suspension rod (610); and the output end of the positioning motor (620) is fixedly connected to one end of the bidirectional screw (611); the two moving rods (618) are both slidably connected to the rotating suspension rod (610), and the two moving rods (618) are both threadedly connected to the bidirectional screw (611).

6. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: Each group of the telescopic components comprises a positioning cylinder (612) and a telescopic rod (619); the positioning cylinder (612) is fixedly connected to the moving rod (618); the telescopic rod (619) is movably connected to the moving rod (618); and the telescopic rod (619) is fixedly connected to the output end of the positioning cylinder (612).

7. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: Each group of the flipping and clamping assemblies comprises a flipping motor (614) and a clamping plate (613); the flipping motor (614) is fixedly connected to the bottom of the telescopic rod (619); the clamping plate (613) is rotatably connected to the bottom of the telescopic rod (619); and the clamping plate (613) is fixedly connected to the output end of the flipping motor (614).

8. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The transmission component comprises a linkage assembly, a follower gear ring (608) and a driving gear (607); the follower gear ring (608) is fixedly connected to the top of the closed cover (603); the driving gear (607) is fixedly connected to the output end of the rotating motor (606); and the linkage assembly is arranged on the mounting frame (602).

9. A metal 3D printed parts displacement-free conveying line as claimed in claim 1, characterized in that: The linkage assembly comprises a height-adjusting cylinder (601) and a transmission gear (609); the height-adjusting cylinder (601) is fixedly connected to a mounting frame (602); and the transmission gear (609) is rotatably connected to an output end of the height-adjusting cylinder (601).

10. The metal 3D printed parts displacement-free conveying line according to claim 1, characterized in that: The collecting component comprises a feed hopper (615) and a screen (616), wherein the feed hopper (615) is fixedly connected to the top of the powder collector (617), and the screen (616) is fixedly connected to the bottom of the feed hopper (615).

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