Automatic soft scraper replacing device for selective laser melting additive manufacturing system

Abstract

The utility model relates to the technical field of laser additive manufacturing, in particular to an automatic soft scraper replacing device for a selective laser melting additive manufacturing system, which comprises a scraper holder capable of moving along a guide rail to a preset position; the soft scraper storage part is used for providing a new soft scraper and storing an old soft scraper, the soft scraper storage part is provided with a storage opening and an outlet, and the outlet of the soft scraper storage part is provided with a cutting part. According to the utility model, the function of automatically replacing the scraper of the selective laser melting equipment is realized, and a series of adverse effects of changing the atmosphere environment in the forming bin, polluting metal powder, reducing the forming quality of parts and the like during the traditional scraper replacement operation are eliminated. According to the method for automatically replacing the scraper, the scraper replacement efficiency is greatly improved, a large amount of time is saved, and the difficulty of manual operation is reduced. The production efficiency of selective laser melting equipment is improved, the production process is accelerated, and meanwhile the printing quality of parts is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser additive manufacturing, in particular to a soft scraper automatic replacement device for a selective laser melting additive manufacturing system. Background Art

[0002] Selective laser melting (SLM) is a major technology in additive manufacturing of metal materials. This technology uses laser as the energy source and scans the metal powder bed layer by layer according to the path planned in the slicing file. The scanned metal powder is melted and solidified to achieve the effect of metallurgical bonding, and finally the metal parts designed by the model are obtained. The metal parts formed by SLM technology have higher density, strength and various physical and chemical properties, and their performance in forming accuracy and minimum forming structure size is also very good. Its applicable materials have also covered titanium alloys, iron-based alloys, nickel-based alloys and other materials. It has significant advantages in many fields such as mold manufacturing, aerospace, biomedicine, etc., and has therefore received more and more attention and application.

[0003] In the selective laser melting process, the scraper plays the role of spreading the metal powder evenly on the powder bed. It is a very important component in the powder spreading system and has a huge impact on the molding quality of the printed parts. Soft scrapers are widely used in various selective laser melting equipment due to their strong applicability and low cost, but the problem of soft scrapers being easily damaged needs to be solved urgently. Metal parts are prone to deformation and warping during the molding process due to the rapid cooling and heating characteristics of SLM technology. The warped and protruding parts of the parts will scrape against the soft scraper during the scraper powder spreading process, thereby damaging the scraper. A damaged scraper will leave linear dents or convex marks on the surface of the powder bed during the subsequent powder spreading process, which will affect the printing quality of the part. Therefore, the scraper must be replaced before printing can continue.

[0004] At present, when replacing the scraper, the door of the chamber needs to be opened. This process will not only change the atmosphere in the molding chamber, but also may pollute the powder. Pausing printing will also have a certain impact on the molding quality of the parts. Therefore, the development of a device for automatically replacing the scraper of selective laser melting equipment is very important to improve the production efficiency of the equipment and the printing quality of parts. It has important practical value and broad market prospects. Utility Model Content

[0005] In view of the technical problems existing in the soft scraper replacement process in the prior art, the utility model proposes a soft scraper automatic replacement device for a selective laser melting additive manufacturing system, comprising:

[0006] A scraper frame, wherein the scraper frame can move along the guide rail to move to a predetermined position;

[0007] A soft scraper storage component, used for providing new soft scrapers and storing old soft scrapers, the soft scraper storage component is provided with a storage opening and an outlet, the outlet of the soft scraper storage component is provided with a cutting component, used for cutting off the soft scraper at the outlet;

[0008] A scraper clamping component is connected to the scraper frame via a lifting component, the scraper clamping component is used to clamp or release the soft scraper, and the lifting component is used to control the lifting of the scraper frame so that the soft scraper is at a predetermined height;

[0009] A transfer component, comprising a first transfer component and a second transfer component, wherein the first transfer component is connected to the scraper holder, the second transfer component is connected to the soft scraper receiving component, the first transfer component has a transfer state and a non-transfer state, and a transfer channel can be constructed when the first transfer component is in the transfer state;

[0010] When the scraper holder is moved to a predetermined position and the soft scraper is in the transfer channel, the first transfer component and the second transfer component can drive the old soft scraper from the transfer channel into the soft scraper storage component and transfer the new soft scraper to the transfer channel.

[0011] Preferably, the soft scraper storage component includes a first box body and a second box body, the first box body is provided with the storage port and is used to store old soft scrapers, the second box body is provided with the outlet and is used to store new soft scrapers, and a second transfer component is provided at the outlet of the second box body.

[0012] Preferably, the transfer channel, the receiving opening of the first box body and the outlet of the second box body are distributed along a linear direction, and the first box body and the second box body are respectively located at two ends of the transfer channel.

[0013] Preferably, the first transfer component is used to transfer the soft scraper in the transfer channel toward the storage opening of the soft scraper storage component, so that the old soft scraper enters the soft scraper storage component, and the second transfer component is used to transfer the soft scraper in the soft scraper storage component into the transfer channel along the direction of the outlet, and the soft scraper at the outlet is cut off by the cutting component.

[0014] Preferably, the first transfer component includes a plurality of transfer mechanisms, each of the transfer mechanisms includes a conveying wheel and a pressure wheel, the axes of the conveying wheel and the pressure wheel are perpendicular to the powdering surface, the pressure wheel can be driven to move to a first position or a second position, when the pressure wheel is in the first position, a gap for accommodating a soft scraper is formed between the conveying wheel and the pressure wheel, a plurality of the gaps are defined as the transfer channel, when the pressure wheel is in the second position, the width of the gap becomes larger, and the soft scraper can be driven to move in a direction perpendicular to the powdering surface to change the height of the soft scraper.

[0015] Preferably, the transfer mechanism further includes a drive motor and a transverse motor, wherein the drive motor is used to drive the conveying wheel to rotate, and the transverse motor is used to drive the pressing wheel to transfer between the first position and the second position.

[0016] Preferably, it further comprises a controller, wherein the controller is electrically connected to the guide rail, the scraper clamping component, the lifting component and the transfer component;

[0017] The controller controls the movement of the guide rail and the lifting component to move the soft scraper clamped by the scraper clamping component to a predetermined position, and the soft scraper and the transfer channel are aligned with the storage port or outlet of the soft scraper storage component.

[0018] Preferably, the lifting component comprises a first lifting mechanism and a second lifting mechanism, and the first lifting mechanism and the second lifting mechanism are both connected to the scraper clamping component.

[0019] Preferably, the scraper clamping component comprises a first clamping mechanism and a second clamping mechanism, each of the clamping mechanisms comprises a pair of clamping plates, a clamping area is formed between the pair of clamping plates, and the clamping area is parallel to the transfer channel;

[0020] The first lifting mechanism is connected to the first clamping mechanism and is used to control the height of the first clamping mechanism. The second lifting mechanism is connected to the second clamping mechanism and is used to control the height of the second clamping mechanism.

[0021] Preferably, it also includes a leveling plane, which is parallel to the powdering surface, and the leveling plane includes a first pressure sensor and a second pressure sensor arranged along the length direction of the soft scraper, the first pressure sensor and the second pressure sensor are distributed corresponding to the first lifting mechanism and the second lifting mechanism, the first pressure sensor and the second pressure sensor are electrically connected to the controller, and when the scraper holder is above the leveling plane, the height of the soft scraper is adjusted by the lifting component so that the values ​​of the first pressure sensor and the second pressure sensor are the same.

[0022] Compared with the prior art, the advantages of the soft scraper automatic replacement device for the selective laser melting additive manufacturing system of the utility model are:

[0023] (1) A soft scraper storage component is provided on one side of the molding substrate. The soft scraper storage component can store unused soft scrapers and can also store scratched soft scrapers. Therefore, the scratched soft scraper can be transferred to the soft scraper storage component without destroying the atmosphere of the molding chamber, and a new soft scraper can be replaced from the soft scraper storage component to the scraper holder at the same time. Therefore, the entire replacement process will not contaminate the metal powder, and the molding quality of the parts can be guaranteed.

[0024] (2) A lifting component and a transfer component are provided under the scraper frame. The lifting component can control the height and posture of the soft scraper. When the scraper frame is controlled to be in a position corresponding to the soft scraper storage component, the transfer component can transfer the soft scraper under the scraper frame to the soft scraper storage component, and transfer it from the soft scraper storage component to the bottom of the scraper frame by clamping and driving, thereby realizing automatic replacement and leveling of the soft scraper. Compared with the manual replacement of the current technology, the replacement speed and procedure of the soft scraper save time and have a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a soft scraper automatic replacement device for a selective laser melting additive manufacturing system shown in the utility model;

[0026] Figure 2 It is a schematic diagram of the distribution of the transfer component and the lifting component under the scraper frame shown in the utility model;

[0027] Figure 3 It is a structural schematic diagram of the transfer component shown in the utility model;

[0028] Figure 4 It is a structural schematic diagram of a scraper clamping component and a lifting component shown in the utility model. DETAILED DESCRIPTION

[0029] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0030] It should be understood that powder printing is in an inert gas protective atmosphere in the molding chamber. When the soft scraper is scratched by the protrusions in the powder layer, if the soft scraper is replaced, the chamber door must be opened, which destroys the protective atmosphere in the molding chamber and causes contamination to the powder. The parts may also have quality defects due to the pause. Therefore, the automatic soft scraper switching device proposed in this application is intended to achieve replacement without opening the chamber door for manual intervention. The soft scraper strip replacement process can be automatically completed without stopping the equipment or opening the door.

[0031] like Figure 1-2 As shown, the utility model proposes an automatic soft scraper replacement device for a selective laser melting additive manufacturing system, comprising a scraper frame 2, a soft scraper storage component, a scraper clamping component, a lifting component, a transfer component and a controller 1. The controller 1 is electrically connected to the guide rail 3, the scraper clamping component, the lifting component and the transfer component. The controller 1 is used to control the movement of the guide rail 3 and the lifting component to move the soft scraper clamped by the scraper clamping component to a predetermined position.

[0032] A guide rail 3 is provided on one side of the forming substrate, and the scraper frame 2 is installed on the guide rail 3 and can move along the guide rail 3 to move to a predetermined position, such as the zero point position of scraping powder or the soft scraper replacement position and above the powder supply cylinder 25 and the forming cylinder 26.

[0033] Furthermore, the soft scraper storage component is used to provide new soft scrapers and store old soft scrapers. The soft scraper storage component is provided with a storage opening and an outlet. The outlet of the soft scraper storage component is provided with a cutting component for cutting off the soft scraper at the outlet.

[0034] The soft scraper storage part is intended to provide new scrapers and store old scrapers, wherein the new scrapers and the old scrapers are stored in different areas.

[0035] In order to control the state of the soft scraper, the scraper clamping component is connected to the scraper frame 2 through a lifting component. The scraper clamping component is used to clamp or release the soft scraper, and the lifting component is used to control the lifting of the scraper frame 2 so that the soft scraper is at a predetermined height.

[0036] In this way, when replacing the scraper, the requirements of moving the scraper to a specific position, a specific height and whether it is in a positioned state can be met.

[0037] Furthermore, when the soft scraper is in a non-positioned state, the soft scraper can be moved to be replaced with a new scraper. The transfer component includes a first transfer component and a second transfer component 104. The first transfer component is connected to the scraper frame 2 to transfer the soft scraper under the scraper frame 2. The second transfer component 104 is connected to the soft scraper storage component to transfer the soft scraper in the soft scraper storage component.

[0038] The first transfer component has a transfer state and a non-transfer state. When the first transfer component is in the transfer state, a transfer channel can be constructed. When the soft scraper is in the transfer channel, it can be driven by the first transfer component to move along the extension line direction of the transfer channel.

[0039] In an optional embodiment, the soft scraper storage component includes a first box body 22 and a second box body 21, the first box body 22 is provided with a storage port and is used to store old soft scrapers, the second box body 21 is provided with an outlet and is used to store new soft scrapers, and a second transfer component 104 is provided at the outlet of the second box body 21.

[0040] In an optional embodiment, the cutting component includes a first cutting mechanism 19 and a second cutting mechanism 20 , wherein the first cutting mechanism 19 is located at the receiving port of the first box body 22 , and the second cutting mechanism 20 is located at the outlet of the second box body 21 .

[0041] like Figure 1-2 As shown, the transfer channel, the receiving port of the first box body 22 and the outlet of the second box body 21 are distributed along a linear direction, and the first box body 22 and the second box body 21 are respectively located at two ends of the transfer channel.

[0042] In this way, when the transfer channel is driven by the lifting component to move to align with the storage port of the first box body 22 and the outlet of the second box body 21, at this time, the soft scraper, the transfer channel and the storage port or outlet of the soft scraper storage component are aligned, and the soft scraper is driven synchronously by the first transfer component and the second transfer component 104 to make the soft scraper in the transfer channel move toward the storage port of the first box body 22, so that the old soft scraper enters the first box body 22, and the second transfer component 104 transfers the soft scraper in the second box body 21 along the direction of the outlet to the transfer channel, and the cutting component cuts off the soft scraper at the outlet to achieve the replacement of the new soft scraper.

[0043] It should be understood that the soft scraper is a rubber strip, and there is a channel for accommodating the rubber strip in the first box body 22 and the second box body 21. When the rubber strip is transported in a specific direction, the rubber strip can deform and turn along the trajectory of the channel to be received in the box body or come out of the box body.

[0044] Combination Figure 1-2 As shown, the first transfer component includes multiple transfer mechanisms, three of which are shown, namely, transfer mechanism a101, transfer mechanism b102 and transfer mechanism c103. A lifting mechanism is arranged between every two transfer mechanisms, namely, the first lifting mechanism 10 and the second lifting mechanism 9. The first lifting mechanism 10 and the second lifting mechanism 9 are both connected to the scraper clamping component.

[0045] The second transfer component 103 only includes a transfer mechanism disposed in the second box body 21 .

[0046] In an optional embodiment, in combination with Figure 2-3As shown, each transfer mechanism includes a conveying wheel and a pressing wheel, the axes of the conveying wheel and the pressing wheel are perpendicular to the powdering surface, the pressing wheel can be driven to move to a first position or a second position, when the pressing wheel is in the first position, a gap for accommodating a soft scraper is formed between the conveying wheel and the pressing wheel, and a plurality of gaps are defined as transfer channels, when the pressing wheel is in the second position, the width of the gap becomes larger, and the soft scraper 4 can be driven to move in a direction perpendicular to the powdering surface to change the height of the soft scraper.

[0047] In this way, when the transfer mechanism switches from the non-transfer state to the transfer state, the pressure wheel 16 switches from the second position to the first position, the pressure wheel and the conveying wheel can be tightly attached to both sides of the soft scraper 4, and when the conveying wheel rotates, the soft scraper 4 can be driven to move along the length direction of the transfer channel.

[0048] Furthermore, the transfer mechanism also includes a drive motor and a transverse motor, the drive motor is used to drive the conveying wheel to rotate, and the transverse motor is used to drive the pressing wheel to transfer between the first position and the second position.

[0049] In this way, the controller 1 can control the position of the pressing wheel through the transverse motor to determine whether the pressing wheel presses the soft scraper 4 tightly.

[0050] Specifically, the transfer mechanism a101 includes a drive motor a8, a transverse motor a13, and a pressure wheel a16; the transfer mechanism b102 includes a drive motor a7, a transverse motor a14, and a pressure wheel a17; and the transfer mechanism c103 includes a drive motor a6, a transverse motor a15, and a pressure wheel a18.

[0051] When the soft scraper 4 is transferred, the three transfer mechanisms 101 , 102 , and 103 cooperate to drive the soft scraper 4 to move in a predetermined direction.

[0052] Combination Figure 2-4 As shown, the scraper clamping component includes a first clamping mechanism 12 and a second clamping mechanism 11, each clamping mechanism includes a pair of clamping plates, a clamping area is formed between the pair of clamping plates, and the clamping area is parallel to the transfer channel.

[0053] In this way, when a pair of clamping plates are clamped, the soft scraper 4 in the transfer channel can be fixed.

[0054] Furthermore, the first lifting mechanism 10 is connected to the first clamping mechanism 12 and is used to control the height of the first clamping mechanism 12 , and the second lifting mechanism 9 is connected to the second clamping mechanism 11 and is used to control the height of the second clamping mechanism 11 .

[0055] The height of the soft scraper 4 is adjusted by the first lifting mechanism 10 and the second lifting mechanism 9, and the posture of the soft scraper 4 can be controlled to be parallel to the powder spreading surface.

[0056] Furthermore, it also includes a leveling plane, which is parallel to the powdering surface. The leveling plane includes a first pressure sensor 23 and a second pressure sensor 24 arranged along the length direction of the soft scraper. The first pressure sensor 23 and the second pressure sensor 24 are distributed corresponding to the first lifting mechanism 10 and the second lifting mechanism 9. The first pressure sensor 23 and the second pressure sensor 24 are electrically connected to the controller 1.

[0057] In this way, when the scraper holder 2 is above the leveling plane, the height of the soft scraper is adjusted by the lifting component so that the values ​​of the first pressure sensor 23 and the second pressure sensor 24 are the same. At this time, the pressure of the soft scraper 4 on the first pressure sensor 23 and the second pressure sensor 24 is the same. Since the first pressure sensor 23 and the second pressure sensor 24 are in the same plane, the bottom of the soft scraper 4 is also in the same plane, especially parallel to the leveling plane of the powdering surface.

[0058] In an optional embodiment, the leveling plane is disposed between the powder supply cylinder 25 and the forming cylinder 26, and its upper surface is parallel to the horizontal plane of the forming platform.

[0059] In combination with the above embodiments, the automatic replacement process of the soft scraper is as follows:

[0060] S1. When the soft scraper 4 is damaged, the controller 1 controls the scraper holder 2 to move along the powder laying guide rail 3 to the leftmost side of the molding chamber, so that the soft scraper 4 in the scraper holder is aligned with the outlet of the second box body 21 and the receiving opening of the first box body 22;

[0061] S2, the controller 1 controls the second lifting mechanism 9 and the first lifting mechanism 10 to move, so that the second clamping mechanism 11 and the first clamping mechanism 12 are vertically lowered by a distance equal to the thickness of the powder layer, so that the soft scraper 4 contacts the forming platform;

[0062] S4, the controller 1 controls the second clamping mechanism 11 and the first clamping mechanism 12 to release the soft scraper 4;

[0063] S5, the controller 1 controls the lateral movement motor a13, the lateral movement motor a14, and the lateral movement motor a15 to move, so that the pressing wheels a16, b17, and c18 in the transfer mechanism a101, the transfer mechanism b102, and the transfer mechanism c103 move left to clamp the soft scraper 4;

[0064] S6, the drive motor 5, the drive motor a6, the drive motor b7, and the drive motor c8 for moving the scraper conveying mechanism are started to convey the new soft scraper in the second box body 21 to the scraper holder 2, and at the same time convey the damaged soft scraper 4 to the first box body 22;

[0065] S7, the first shearing mechanism 19 and the second shearing mechanism 20 at both ends of the scraper frame 2 cut off the soft scraper 4;

[0066] S8, the controller 1 controls the lateral movement motor a13, lateral movement motor a14, lateral movement motor a15 for moving the rollers in the scraper conveying mechanism horizontally to move, so that the pressing wheel a16, pressing wheel b17, pressing wheel c18 move right to release the soft scraper 4;

[0067] S9, the controller 1 controls the second clamping mechanism 11 and the first clamping mechanism 12 to clamp the soft scraper 4;

[0068] S10, the controller 1 controls the second lifting mechanism 9 and the first lifting mechanism 10 to move, so that the second clamping mechanism 11 and the first clamping mechanism 12 rise a certain distance in the vertical direction so that the soft scraper 4 leaves the forming platform;

[0069] S11, the controller 1 controls the scraper frame 2 to move along the powder spreading guide rail 3, to the leveling plane between the powder supply cylinder 25 and the forming cylinder 26, and to be above the first pressure sensor 23 and the second pressure sensor 24;

[0070] S12, the first pressure sensor 23 and the second pressure sensor 24 are started;

[0071] S13, the controller 1 controls the second lifting mechanism 9 and the first lifting mechanism 10 to move, so that the second clamping mechanism 11 and the first clamping mechanism 12 descend in the vertical direction;

[0072] S14, when the first pressure sensor 23 and the second pressure sensor 24 under the soft scraper 4 respectively detect that the pressure of the scraper strip on the sensor reaches 0.1g, the controller 1 stops the descending movement of the corresponding screw lifting mechanism, and at this time, the lower end of the scraper strip just contacts the horizontal plane of the forming platform;

[0073] S15, the controller 1 controls the second lifting mechanism 9 and the first lifting mechanism 10 to move upward simultaneously in the vertical direction by a distance equal to the thickness of the powder layer;

[0074] S16, the controller 1 controls the scraper frame 2 to move leftward along the powder spreading guide rail 3, and the scraper frame stops moving when it returns to the zero point, and the automatic replacement of the scraper is completed.

[0075] In combination with the above embodiments, the utility model realizes the function of automatically replacing the scraper of the selective laser melting equipment, eliminating a series of adverse effects such as changing the atmosphere in the molding chamber, polluting the metal powder, and reducing the molding quality of the parts during the traditional scraper replacement operation. This method of automatically replacing the scraper greatly improves the efficiency of scraper replacement, which not only saves a lot of time, but also reduces the difficulty of manual operation. This will improve the production efficiency of the selective laser melting equipment, accelerate the production process, and improve the printing quality of the parts. The automatic scraper replacement device adopted in the utility model has a wide range of applicability and can be used for a variety of selective laser melting equipment and process flows. Overall, this utility model brings a series of positive effects to the selective laser melting equipment through an innovative automatic scraper replacement method, and has significant practicality and economic benefits.

[0076] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A soft scraper automatic replacement device for a selective laser melting additive manufacturing system, characterized in that: include: A scraper frame (2), wherein the scraper frame (2) is movable along the guide rail (3); A soft scraper storage component, used for providing new soft scrapers and storing old soft scrapers, the soft scraper storage component is provided with a storage opening and an outlet, the outlet of the soft scraper storage component is provided with a cutting component, used for cutting off the soft scraper at the outlet; A scraper clamping component connected to the scraper frame (2) via a lifting component, the scraper clamping component is used to clamp or release the soft scraper, and the lifting component is used to control the lifting of the scraper frame (2) so that the soft scraper is at a predetermined height; A transfer component, comprising a first transfer component and a second transfer component (104), wherein the first transfer component is connected to the scraper frame (2), and the second transfer component (104) is connected to the soft scraper receiving component, wherein the first transfer component has a transfer state and a non-transfer state, and when the first transfer component is in the transfer state, a transfer channel can be constructed; When the scraper holder (2) is moved to a predetermined position and the soft scraper is in the transfer channel, the first transfer component and the second transfer component (104) can drive the old soft scraper from the transfer channel into the soft scraper storage component and transfer the new soft scraper to the transfer channel.

2. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 1, characterized in that: The soft scraper storage component comprises a first box body (22) and a second box body (21); the first box body (22) is provided with the storage opening and is used to store old soft scrapers; the second box body (21) is provided with the outlet and is used to store new soft scrapers; and a second transfer component (104) is provided at the outlet of the second box body (21).

3. The soft scraper automatic replacement device for the selective laser melting additive manufacturing system according to claim 2, characterized in that: The transfer channel, the receiving opening of the first box body (22) and the outlet of the second box body (21) are distributed along a linear direction, and the first box body (22) and the second box body (21) are respectively located at two ends of the transfer channel.

4. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 3, characterized in that: The first transfer component is used to transfer the soft scraper in the transfer channel toward the storage opening of the soft scraper storage component, so that the old soft scraper enters the soft scraper storage component. The second transfer component (104) is used to transfer the soft scraper in the soft scraper storage component to the transfer channel along the direction of the outlet, and the cutting component cuts off the soft scraper at the outlet.

5. The soft scraper automatic replacement device for a selective laser melting additive manufacturing system according to claim 1, characterized in that: The first transfer component includes a plurality of transfer mechanisms, each of which includes a conveying wheel and a pressure wheel, the axes of the conveying wheel and the pressure wheel are perpendicular to the powdering surface, the pressure wheel can be driven to move to a first position or a second position, when the pressure wheel is in the first position, a gap for accommodating a soft scraper is formed between the conveying wheel and the pressure wheel, and a plurality of the gaps are defined as the transfer channel, when the pressure wheel is in the second position, the width of the gap becomes larger, and the soft scraper can be driven to move in a direction perpendicular to the powdering surface to change the height of the soft scraper.

6. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 5, characterized in that: The transfer mechanism further includes a drive motor and a transverse motor, wherein the drive motor is used to drive the conveying wheel to rotate, and the transverse motor is used to drive the pressing wheel to transfer between the first position and the second position.

7. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 1, characterized in that: It also includes a controller (1), wherein the controller (1) is electrically connected to the guide rail (3), the scraper clamping component, the lifting component, and the transfer component; The controller (1) controls the movement of the guide rail (3) and the lifting component, so that the soft scraper clamped by the scraper clamping component moves to a predetermined position, and the soft scraper and the transfer channel are aligned with the storage opening or outlet of the soft scraper storage component.

8. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 7, characterized in that: The lifting component comprises a first lifting mechanism (10) and a second lifting mechanism (9), and the first lifting mechanism (10) and the second lifting mechanism (9) are both connected to the scraper clamping component.

9. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 8, characterized in that: The scraper clamping component comprises a first clamping mechanism (12) and a second clamping mechanism (11), each of the clamping mechanisms comprises a pair of clamping plates, a clamping area is formed between the pair of clamping plates, and the clamping area is parallel to the transfer channel; The first lifting mechanism (10) is connected to the first clamping mechanism (12) and is used to control the height of the first clamping mechanism (12); the second lifting mechanism (9) is connected to the second clamping mechanism (11) and is used to control the height of the second clamping mechanism (11).

10. The automatic soft scraper replacement device for a selective laser melting additive manufacturing system according to claim 8 or 9, characterized in that: The invention also comprises a leveling plane, which is parallel to the powder spreading surface. The leveling plane comprises a first pressure sensor (23) and a second pressure sensor (24) arranged along the length direction of the soft scraper. The first pressure sensor (23) and the second pressure sensor (24) are distributed corresponding to the first lifting mechanism and the second lifting mechanism. The first pressure sensor (23) and the second pressure sensor (24) are electrically connected to the controller (1). When the scraper holder (2) is above the leveling plane, the height of the soft scraper is adjusted by the lifting component so that the values ​​of the first pressure sensor (23) and the second pressure sensor (24) are the same.

Images