A low-residue quantitative feeding device for preparing 3D printing alloy powder

Abstract

The invention discloses a low-residue quantitative feeding device for preparing 3D printing alloy powder, which relates to the technical field of 3D printing alloy powder production, and comprises: a sealing shell, which comprises a first shell and a second shell, and the second shell is hinged on the first shell; a plasma mechanism, which is arranged on the second shell; a driving mechanism, which comprises a transmission shaft and a motor, and one end of the transmission shaft is fixedly installed on the output shaft of the motor through a coupling; a connecting part, a rod is fixedly connected to the other end of the transmission shaft through the connecting part; a frame assembly, and the motor is slidably connected to the frame assembly; a feeding mechanism, in the above technical scheme, a circular ring structure surrounded by a plurality of sealing blocks is used to seal the rod and the first shell, as the feeding continues, the sealing blocks are separated from each other, and the rotating sleeve is directly inserted into the first shell to realize direct sealing, so that the rod can be fed as much as possible, the residue of the rod is reduced, and the utilization rate of the rod is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing alloy powder production, and in particular to a low-residue quantitative feeding device for preparing 3D printing alloy powder. Background Art

[0002] Alloy powder is widely used as a kind of 3D printing additive material. The following methods are often used to prepare alloy powder: atomization, reduction, electrolysis, mechanical alloying, etc. The atomization method is divided into vacuum gas atomization, electrode induction gas atomization, plasma rotating electrode atomization, plasma wire atomization, etc. Among them, the plasma rotating electrode uses the centrifugal force generated by the high-speed rotation of the electrode to throw out the liquid film to form droplets, which are atomized and solidified into spherical powder in an inert atmosphere.

[0003] When using the plasma rotating electrode atomization method to prepare alloy powder, the rod material is clamped by a clamp and inserted into a sealed container. When the rod material is close to the plasma gun, it melts under the action of high temperature. During high-speed rotation, it is affected by centrifugal force and the formed liquid film is thrown out to form droplets, which are solidified into spherical powder in an inert atmosphere. During the production process, a part of the rod material at the end cannot be used, and there is a large amount of remaining rod body. The remaining rod material length is equal to the length required for clamping by the clamp and the thickness of the sealed container, which inevitably leads to insufficient utilization of the rod material. Summary of the invention

[0004] The purpose of the present invention is to provide a low-residue quantitative feeding device for preparing 3D printing alloy powder to solve the deficiencies in the above-mentioned prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a low-residue quantitative feeding device for preparing 3D printing alloy powder, comprising:

[0006] A sealed shell, comprising a first shell and a second shell, wherein the second shell is hinged to the first shell;

[0007] A plasma mechanism, which is disposed on the second housing;

[0008] The driving mechanism comprises a transmission shaft and a motor, wherein one end of the transmission shaft is fixedly mounted on the output shaft of the motor through a coupling;

[0009] A connecting portion, through which the bar is fixedly connected to the other end of the transmission shaft;

[0010] A frame assembly, to which the motor is slidably connected;

[0011] A feeding mechanism, which is used for the motor to move along the frame assembly so that the bar stock can be inserted into the sealing shell;

[0012] Also includes:

[0013] The sealing assembly comprises a rotating disk, a stand, a telescopic part and a sealing block, wherein the rotating disk is rotatably connected in the first housing, a plurality of the stands are evenly distributed on the rotating disk, the telescopic part is slidably connected in the stand, and one end of the sealing block is fixedly mounted on the telescopic part;

[0014] The sealing assembly has a first state and a second state. In the first state, a plurality of the sealing blocks are attached to the outside of the rod, and the sealing blocks are rotatably connected in the first shell, so that the rod and the first shell are sealed by the plurality of the sealing blocks. As the rod is fed, the connecting part squeezes the sealing block, and the sealing assembly passively switches to the second state. The sealing block moves toward the center of the sealing shell and unfolds after the sealing block is separated from the first shell, so that the connecting part is rotatably plugged into the first shell.

[0015] Preferably, the plasma mechanism comprises a cylinder and a plasma gun, the cylinder is mounted on the second shell, and the plasma gun is arranged on the cylinder.

[0016] Preferably, it is characterized in that the connecting part includes a rotating sleeve, a rotating shaft, a swing arm, a counterweight, a clamping block, and a torsion spring, one end of the rotating sleeve is connected to the transmission shaft, the other end of the rotating sleeve is used for inserting the rod material, the rotating shaft is rotatably connected in the rotating sleeve, the swing arm is fixedly mounted on the rotating shaft, the clamping block is arranged at one end of the swing arm, and the counterweight is arranged at the other end of the swing arm.

[0017] Preferably, the torsion spring applies a torsion force to the rotating shaft to drive its rotation, so that the clamping block has a tendency to move away from the rod. During the rotation of the rotating sleeve, the counterweight block will drive the swing arm to rotate under the action of centrifugal force to overcome the torsion force of the torsion spring, so that the clamping block clamps the rod.

[0018] Preferably, a stop block is included, and the stop block is fixedly mounted on the pressing block.

[0019] Preferably, the frame assembly includes legs and an L-shaped base, the legs are fixedly mounted on the lower portion of the L-shaped base, the motor is slidably connected to the horizontal section of the L-shaped base, and the transmission shaft rotates through the vertical section of the L-shaped base.

[0020] Preferably, the feeding mechanism is configured as a hydraulic cylinder, and an output end of the hydraulic cylinder is fixedly connected to the motor.

[0021] Preferably, the telescopic part includes a sliding arm, a first elastic member, a connecting block, and a plug-in rod, the sliding arm is slidably connected to the vertical frame, the connecting block is fixedly mounted on the sealing block, one end of the plug-in rod is fixedly mounted on the connecting block, the other end of the plug-in rod is slidably plugged into the sliding arm, and the first elastic member is sleeved on the outside of the plug-in rod.

[0022] Preferably, in the second state, the rotating sleeve is inserted into the first shell.

[0023] Preferably, a sealing strip is provided on the sealing block.

[0024] In the above technical scheme, the present invention provides a low-residue quantitative feeding device for preparing 3D printing alloy powder. The circular ring structure formed by multiple sealing blocks can seal the space between the rod and the first shell to ensure that the protective atmosphere in the sealing shell will not leak. As the feeding continues, the multiple sealing blocks are passively separated from each other so that the rotating sleeve can be directly inserted into the first shell. Direct sealing is achieved through the cooperation of the rotating sleeve and the first shell, so that the rod can be fed as much as possible, reducing the residue of the rod and greatly improving the utilization rate of the rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 This is a schematic diagram of a low-residue quantitative feeding device for preparing alloy powder for 3D printing according to the present invention;

[0027] Figure 2 This is a cross-sectional view of a sealing shell of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention;

[0028] Figure 3 The invention provides an accessory for a low-residue quantitative feeding device for preparing 3D printing alloy powder. Figure 2 The schematic diagram of the structure after the enlargement of A in the middle;

[0029] Figure 4 It is a structural schematic diagram of a rotating sleeve of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention when it abuts against a sealing block;

[0030] Figure 5 This is a structural schematic diagram of a sealing component of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention when it is in a second state;

[0031] Figure 6 The invention provides an accessory for a low-residue quantitative feeding device for preparing 3D printing alloy powder. Figure 5 The schematic diagram of the structure after the enlargement of B in the middle;

[0032] Figure 7 This is a schematic diagram of the sealing component structure of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention;

[0033] Figure 8 This is a schematic diagram of the telescopic structure of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention;

[0034] Fig. 9 This is a cross-sectional view of the connection portion of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention;

[0035] Fig.10 The invention provides an accessory for a low-residue quantitative feeding device for preparing 3D printing alloy powder. Fig. 9 The schematic diagram of the structure after the enlargement of C in the middle;

[0036] Fig.11 This is a schematic diagram of the connection structure of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention;

[0037] Fig.12 This is a schematic diagram of the structure of the second elastic part of a low-residue quantitative feeding device for preparing 3D printing alloy powder according to the present invention.

[0038] Explanation of the reference numerals in the accompanying drawings: 1. Sealing shell; 11. First shell; 12. Second shell; 2. Plasma mechanism; 21. Cylinder; 22. Plasma gun; 3. Frame assembly; 31. Leg; 32. L-shaped base; 4. Driving mechanism; 41. Transmission shaft; 42. Motor; 5. Feed mechanism; 6. Connecting part; 61. Rotating sleeve; 62. Rotating shaft; 63. Swing arm; 631. Counterweight block; 64. Pressing block; 65. Stop block; 66. Torsion spring; 7. Rod; 8. Sealing assembly; 81. Turntable; 82. Stand; 821. Second elastic member; 83. Sliding arm; 831. Connecting block; 832. Plug-in rod; 84. Sealing block; 85. First elastic member; 86. Sealing strip. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0040] See also Figure 1-12 , a low-residue quantitative feeding device for preparing 3D printing alloy powder provided by an embodiment of the present invention comprises:

[0041] The sealed housing 1 comprises a first housing 11 and a second housing 12, wherein the second housing 12 is hingedly connected to the first housing 11;

[0042] The plasma mechanism 2 is disposed on the second housing 12;

[0043] The driving mechanism 4 comprises a transmission shaft 41 and a motor 42, wherein one end of the transmission shaft 41 is fixedly mounted on the output shaft of the motor 42 via a coupling;

[0044] The connecting part 6, the bar material 7 is fixedly connected to the other end of the transmission shaft 41 through the connecting part 6;

[0045] The frame assembly 3, the motor 42 is slidably connected to the frame assembly 3;

[0046] A feeding mechanism 5, which is used for the motor 42 to move along the frame assembly 3 so that the bar 7 is inserted into the sealing shell 1;

[0047] Also includes:

[0048] The sealing assembly 8 includes a rotating disk 81, a stand 82, a telescopic part and a sealing block 84. The rotating disk 81 is rotatably connected to the first housing 11. A plurality of stands 82 are evenly distributed on the rotating disk 81. The telescopic part is slidably connected to the stand 82. One end of the sealing block 84 is fixedly mounted on the telescopic part.

[0049] The sealing assembly 8 has a first state and a second state. In the first state, a plurality of sealing blocks 84 are attached to the outside of the rod 7, and the sealing blocks 84 are rotatably connected to the first shell 11, so that the rod 7 and the first shell 11 are sealed by the plurality of sealing blocks 84. As the rod 7 is fed, the connecting portion 6 squeezes the sealing blocks 84, and the sealing assembly 8 is passively switched to the second state. The sealing blocks 84 are displaced toward the center of the sealing shell 1, and are unfolded after the sealing blocks 84 are separated from the first shell 11, so that the connecting portion 6 is rotatably plugged into the first shell 11.

[0050] The rod 7 and the transmission shaft 41 can be fixedly connected by the connection part 6. In this way, when the motor 42 rotates, the rod 7 can be synchronously driven to rotate together. The rod 7 is inserted into the sealed shell 1, and the plasma mechanism 2 melts the rod 7 to form a liquid film. The formed liquid film is thrown out to form droplets through the high-speed rotation of the motor 42, and solidified into spherical powder in an inert atmosphere to be retained in the sealed shell 1.

[0051] As the rod 7 is consumed, the feeding mechanism 5 continuously pushes the motor 42 to move, and synchronously, the rod 7 is continuously inserted into the sealing shell 1 to ensure that the rod 7 and the plasma mechanism 2 are always in a working state;

[0052] The sealing assembly 8 has a first state and a second state. In the first state, as shown in FIG. Figure 2 and 3As shown, at this time, a plurality of sealing blocks 84 form an annular structure, the inner wall of the annular structure and the outside of the bar 7 are slidably sealed, and the outer wall of the annular structure and the first shell 11 are slidably sealed, and the sealing blocks 84 are used to seal the bar and the first shell 11. As the feeding continues, the connecting portion 6 contacts the sealing block 84. At this time, the sealing assembly 8 will switch to the second state. Under the extrusion of the connecting portion 6, the sealing assembly 8 will switch to the state shown in the attached figure. Figure 5 and Figure 6 The state shown is in the second state. In this state, the sealing block 84 is first moved laterally and then expanded to separate the multiple sealing blocks 84 from each other. The connecting part 6 is inserted into the first shell 11. The connecting part 6 and the first shell 11 are rotated and sealed to ensure the sealing of the sealing shell 1, and one end of the connecting part 6 is inserted into the first shell 11. In this way, the rod stock 7 can be fed as much as possible, reducing the residual rod stock and greatly improving the utilization rate of the rod stock 7.

[0053] In the embodiments of the present invention, please refer to Figure 2 The plasma mechanism 2 includes a cylinder 21 and a plasma gun 22. The cylinder 21 is mounted on the second housing 12, and the plasma gun 22 is disposed on the cylinder 21. The plasma arc generated by the plasma gun 22 heats the rod 7 so that a liquid film is generated on the rod 7. The liquid film is thrown out under the centrifugal force of the high-speed rotation of the rod 7 to form droplets under a protective atmosphere, and powder is formed after the droplets are cooled.

[0054] In the embodiments of the present invention, please refer to Fig. 9 , Fig.10 , Fig.11 The connecting part 6 includes a rotating sleeve 61, a rotating shaft 62, a swing arm 63, a counterweight 631, a clamping block 64, and a torsion spring 66. One end of the rotating sleeve 61 is connected to the transmission shaft 41, and the other end of the rotating sleeve 61 is used for inserting the rod 7. The rotating shaft 62 is rotatably connected in the rotating sleeve 61, the swing arm 63 is fixedly installed on the rotating shaft 62, the clamping block 64 is arranged at one end of the swing arm 63, and the counterweight 631 is arranged at the other end of the swing arm 63.

[0055] The torsion spring 66 applies a torsion force to the rotating shaft 62 to drive its rotation, so that the clamping block 64 tends to move away from the rod 7. During the rotation of the rotating sleeve 61, the counterweight block 631, under the action of centrifugal force, drives the swing arm 63 to rotate to overcome the torsion force of the torsion spring 66, so that the clamping block 64 clamps the rod 7.

[0056] The connecting part 6 can automatically lock the rod 7 so that the rod 7 can rotate at high speed along with the transmission shaft 41, and the surface of the rotating sleeve 61 is smooth and without gaps, thereby ensuring the sealing of the rotating sleeve 61 and the first shell 11 during the rotational sealing connection. When the motor 42 rotates, the rotating sleeve 61 can be synchronously driven to rotate together. When the rotating sleeve 61 rotates, due to the inconsistent weights at both ends of the swing arm 63, one end of the counterweight block 631 tends to flip outward, thereby allowing the clamping block 64 to be squeezed on the outside of the rod 7 to clamp the rod 7 and ensure the stability of the rod 7 during rotation. No manual locking is required. After the rotation is completed, under the action of the torsion force of the torsion spring 66, the rotating shaft 62 rotates so that the clamping block 64 can be separated from the rod 7, thereby facilitating the workers to replace the rod 7.

[0057] Furthermore, since the rotating sleeve 61 needs to enter the first housing 11, it is affected by the friction of the first housing 11 and the heat transfer of the bar 7, and the temperature of the rotating sleeve 61 will increase. In order to reduce the influence of the temperature, refer to Fig.11 In the process of the counterweight 631 rotating with the rotating sleeve 61, since the counterweight 631 has a certain bevel angle, it acts as a fan blade and can stir the air. Since the end of the rotating sleeve 61 has an opening, the fluidity of the air in the rotating sleeve 61 is increased, and the flow of air can play a cooling role, thereby minimizing the impact of temperature on the rotating sleeve 61.

[0058] In the embodiment of the present invention, a stop block 65 is included, and the stop block 65 is fixedly mounted on the pressing block 64. The stop block 65 has a limiting function. When the bar 7 is inserted, the stop block 65 prevents the bar 7 from being inserted too much. When the length of the bar 7 is consistent, there is no need to re-establish the coordinate system, so as to save the time of replacing the bar 7.

[0059] In the embodiments of the present invention, please refer to Figure 1 The frame assembly 3 includes a support leg 31 and an L-shaped base 32 . The support leg 31 is fixedly mounted at the lower portion of the L-shaped base 32 . The motor 42 is slidably connected to the horizontal section of the L-shaped base 32 . The transmission shaft 41 rotates through the vertical section of the L-shaped base 32 .

[0060] The feeding mechanism 5 is configured as a hydraulic cylinder, and an output end of the hydraulic cylinder is fixedly connected to the motor 42 .

[0061] The motor 42 is slidably connected to the L-shaped base 32. The motor 42 can be moved laterally by the drive of the hydraulic cylinder. When the motor 42 moves laterally, the feeding of the bar 7 can be realized synchronously. The transmission shaft 41 is limited by the L-shaped base 32 and can only rotate and move axially. The limitation of the L-shaped base 32 improves the stability of the transmission shaft 41 and reduces the vibration during high-speed rotation.

[0062] In the embodiments of the present invention, please refer to Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The telescopic part includes a sliding arm 83, a first elastic member 85, a connecting block 831, and a plug-in rod 832. The sliding arm 83 is slidably connected to the vertical frame 82, the connecting block 831 is fixedly mounted on the sealing block 84, one end of the plug-in rod 832 is fixedly mounted on the connecting block 831, and the other end of the plug-in rod 832 is slidably plugged into the sliding arm 83, and the first elastic member 85 is sleeved on the outside of the plug-in rod 832.

[0063] In the second state, the rotating sleeve 61 is inserted into the first housing 11 .

[0064] A sealing strip 86 is provided on the sealing block 84 .

[0065] In the first state, the bar 7 is fed and inserted into the first shell 11. At this time, the sealing block 84 is inserted into the first shell 11 and forms an annular structure. The bar 7 passes through the annular structure and is inserted into the sealing shell 1. The sealing block 84 can seal the bar 7 and the first shell 11. As the feeding continues, the rotating sleeve 61 will gradually squeeze the sealing block 84. The sealing block 84 will be subjected to pressure and will move laterally toward the center of the sealing shell 1. After the sealing block 84 is separated from the first shell 11, the rotating sleeve 61 continues to feed, and the first elastic member 85 will be compressed. At this time, the sealing block 84 is expanded with the rotating sleeve 61 as the center. At this time, it is switched to the second state, as shown in the attached figure. Figure 6 In the state shown, the rotating sleeve 61 is inserted into the first shell 11, and direct sealing is achieved through the cooperation between the rotating sleeve 61 and the first shell 11, so that the rod 7 can be fed as much as possible, reducing the residue of the rod.

[0066] Moreover, in the second state, the sealing block 84 is still in contact with the rotating sleeve 61. During the rotation process, the rotating sleeve 61 can drive the sealing block 84 to rotate together, so that the entire sealing assembly 8 rotates synchronously. During the rotation process, under the action of centrifugal force, it is not easy to produce powder residue between multiple sealing blocks 84, so that when collecting powder manually, the difficulty of collection is greatly reduced. And the sealing assembly 8 rotates with it, which helps to flow the inert gas in the sealing shell 1, so that the flow of the inert gas helps the droplets to be atomized and solidified into spherical powder.

[0067] See also Fig.12A second elastic member 821 is provided in the stand 82, and a pressure is applied to the sliding arm 83 through the second elastic member 821, so that the sliding arm 83 has a tendency to move toward the first shell 11. In this way, during the process of inserting the rod 7 into the sealing assembly 8, the sealing block 84 is prevented from moving, ensuring that the sealing block 84 can be in rotational connection with the first shell 11.

[0068] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A feeding device for preparing alloy powder for 3D printing, comprising: A sealed shell (1), comprising a first shell (11) and a second shell (12), wherein the second shell (12) is hinged to the first shell (11); A plasma mechanism (2) disposed on the second housing (12); A driving mechanism (4), comprising a transmission shaft (41) and a motor (42), wherein one end of the transmission shaft (41) is fixedly mounted on an output shaft of the motor (42) via a coupling; A connecting portion (6), through which the bar material (7) is fixedly connected to the other end of the transmission shaft (41); A frame assembly (3), wherein the motor (42) is slidably connected to the frame assembly (3); A feeding mechanism (5) for moving the motor (42) along the frame assembly (3) so that the bar (7) is inserted into the sealing shell (1); It is characterized by further comprising: The sealing assembly (8) comprises a rotating disk (81), a stand (82), a telescopic part and a sealing block (84), wherein the rotating disk (81) is rotatably connected to the first housing (11), a plurality of the stand (82) are evenly distributed on the rotating disk (81), the telescopic part is slidably connected to the stand (82), and one end of the sealing block (84) is fixedly mounted on the telescopic part; The sealing assembly (8) has a first state and a second state. In the first state, a plurality of the sealing blocks (84) are attached to the outside of the rod (7), and the sealing blocks (84) are rotatably connected to the inside of the first shell (11), so that the rod (7) and the first shell (11) are sealed by the plurality of the sealing blocks (84). As the rod (7) is fed, the connecting portion (6) squeezes the sealing blocks (84), and the sealing assembly (8) is passively switched to the second state. The sealing blocks (84) are displaced toward the center of the sealing shell (1), and are unfolded after the sealing blocks (84) are separated from the first shell (11), so that the connecting portion (6) is rotatably plugged into the inside of the first shell (11).

2. A feeding device for preparing alloy powder for 3D printing according to claim 1, characterized in that: The plasma mechanism (2) comprises a cylinder (21) and a plasma gun (22); the cylinder (21) is mounted on a second housing (12); and the plasma gun (22) is arranged on the cylinder (21).

3. A feeding device for preparing alloy powder for 3D printing according to claim 1, characterized in that: The connecting part (6) comprises a rotating sleeve (61), a rotating shaft (62), a swing arm (63), a counterweight (631), a pressing block (64), and a torsion spring (66); one end of the rotating sleeve (61) is connected to the transmission shaft (41); the other end of the rotating sleeve (61) is used for inserting the rod (7); the rotating shaft (62) is rotatably connected in the rotating sleeve (61); the swing arm (63) is fixedly mounted on the rotating shaft (62); the pressing block (64) is arranged at one end of the swing arm (63); and the counterweight (631) is arranged at the other end of the swing arm (63).

4. According to a feeding device for preparing 3D printing alloy powder as described in claim 3, the torsion spring (66) applies a torsion force to the rotating shaft (62) to drive its rotation, so that the clamping block (64) has a tendency to move away from the rod (7). During the rotation of the rotating sleeve (61), the counterweight block (631) will drive the swing arm (63) to rotate under the action of centrifugal force to overcome the torsion of the torsion spring (66), so that the clamping block (64) clamps the rod (7).

5. A feeding device for preparing alloy powder for 3D printing according to claim 4, characterized in that: It comprises a stop block (65), wherein the stop block (65) is fixedly mounted on the pressing block (64).

6. A feeding device for preparing alloy powder for 3D printing according to claim 1, characterized in that: The frame assembly (3) comprises a support leg (31) and an L-shaped base (32), wherein the support leg (31) is fixedly mounted on the lower part of the L-shaped base (32), the motor (42) is slidably connected to the horizontal section of the L-shaped base (32), and the transmission shaft (41) rotates through the vertical section of the L-shaped base (32).

7. A feeding device for preparing alloy powder for 3D printing according to claim 6, characterized in that: The feeding mechanism (5) is configured as a hydraulic cylinder, and the output end of the hydraulic cylinder is fixedly connected to the motor (42).

8. A feeding device for preparing alloy powder for 3D printing according to claim 1, characterized in that: The telescopic part includes a sliding arm (83), a first elastic member (85), a connecting block (831), and a plug-in rod (832); the sliding arm (83) is slidably connected to the stand (82); the connecting block (831) is fixedly mounted on the sealing block (84); one end of the plug-in rod (832) is fixedly mounted on the connecting block (831); the other end of the plug-in rod (832) is slidably plugged into the sliding arm (83); and the first elastic member (85) is sleeved on the outside of the plug-in rod (832).

9. A feeding device for preparing alloy powder for 3D printing according to claim 3, characterized in that: In the second state, the rotating sleeve (61) is inserted into the first housing (11).

10. A feeding device for preparing alloy powder for 3D printing according to claim 1, characterized in that: The sealing block (84) is provided with a sealing rubber strip (86).

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