Electric scraper replacement powder spreading system, additive manufacturing equipment and method

Abstract

The present invention provides an electric scraper replacement powder spreading system, additive manufacturing equipment and method, and belongs to the field of additive manufacturing. The electric scraper replacement powder spreading system comprises: a scraper storage cylinder, a scraper recovery cylinder and a powder spreading device; a plurality of prepared scrapers are stored in the scraper storage cylinder; the scraper recovery cylinder is used to recover the replaced scrapers; the powder spreading device comprises a scraper limiting plate, and a scraper is arranged in the scraper limiting plate; when the powder spreading device is located above the scraper recovery cylinder, the scraper limiting plate extends to place the scraper into the scraper recovery cylinder, and when the powder spreading device is located above the scraper storage cylinder, the scraper limiting plate retracts to install the scraper on the powder spreading device. By using the present invention, when the scraper is damaged, the replacement of the working scraper can be completed without opening the molding processing chamber, and at the same time, the scraper replacement cycle can be extended, the continuous processing time is increased, and the work efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the field of additive manufacturing, and specifically relates to an electric scraper replacement powder spreading system, additive manufacturing equipment and method, which are applied to powder spreading laser additive manufacturing. Background Art

[0002] 3D printing manufacturing is a laser additive manufacturing technology and a relatively advanced direct manufacturing technology. Its main principle is to use laser to melt the powder raw materials, and then sinter them into the required structure, and then process them layer by layer until the whole workpiece is manufactured. 3D printing manufacturing is a layer-by-layer manufacturing technology. The powder raw materials are evenly laid in the processing area, and the current powder layer is processed by laser sintering processing combined with the slicing data of computer layered slicing software. The above processing operations are repeated until the part is finally formed. 3D printing technology can complete the manufacturing of parts in one go. This manufacturing method can enhance the integration performance of parts and reduce the mutual force between parts when the split parts are assembled. It is widely used in many fields such as aerospace, shipbuilding, medical treatment, nuclear power, etc.

[0003] During the working process of traditional powder bed additive manufacturing equipment: one side is the powder supply cylinder, and the other side is the forming cylinder. After each layer of powder is processed by laser forming, the powder supply cylinder rises by one powder layer thickness, and the forming cylinder drops by one powder layer thickness. The powder scraper moves horizontally from the powder supply cylinder to the forming cylinder. After the forming cylinder is fully covered with a layer of powder, the powder scraper moves horizontally back to complete the laying of a layer of powder.

[0004] Traditional powder spreading devices are usually equipped with only one working scraper. When the working scraper is accidentally damaged, the processing needs to be stopped, the processing chamber door needs to be opened, and the scraper needs to be replaced. Before starting the processing again, the pre-operations such as filling the protective gas need to be performed again. This scraper replacement method will reduce the processing efficiency to a certain extent and increase the workload of replacing the scraper. At the same time, if the scraper is damaged during the processing process, it may cause all the workpieces processed this time to be scrapped. Summary of the invention

[0005] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art and to provide an electric scraper replacement powder spreading system, additive manufacturing equipment and method. The powder spreading device can realize the electric switching of the scraper in the molding processing chamber.

[0006] The present invention is achieved through the following technical solutions:

[0007] A first aspect of the present invention provides an electric scraper replacement powder spreading system, the electric scraper replacement powder spreading system comprising: a scraper storage cylinder, a scraper recovery cylinder and a powder spreading device;

[0008] A plurality of prepared scrapers are stored in the scraper storage cylinder;

[0009] The scraper recovery cylinder is used to recover the replaced scraper;

[0010] The powder spreading device comprises a scraper limiting plate, in which a scraper is arranged;

[0011] When the powder spreading device is located above the scraper recovery cylinder, the scraper limiting plate extends to place the scraper into the scraper recovery cylinder. When the powder spreading device is located above the scraper storage cylinder, the scraper limiting plate retracts to install the scraper on the powder spreading device.

[0012] A further improvement of the present invention is that the scraper storage cylinder comprises a scraper storage cylinder body, and the scraper storage cylinder body comprises a first vertical plate, a bottom plate and a second vertical plate connected into one body;

[0013] The first vertical plate and the second vertical plate are arranged in parallel and are perpendicular to the bottom plate;

[0014] A first side plate of the scraper storage cylinder and a second side plate of the scraper storage cylinder are symmetrically installed on both sides of the scraper storage cylinder body, and the two are arranged in parallel and are both perpendicular to the bottom plate, and are also perpendicular to the first vertical plate and the second vertical plate;

[0015] The left inner wall of the first side plate of the scraper storage cylinder is fixedly connected to the front end of the first vertical plate, and the right inner wall is fixedly connected to the front end of the second vertical plate;

[0016] The left inner wall of the second side plate of the scraper storage cylinder is fixedly connected to the rear end of the first vertical plate, and the right inner wall is fixedly connected to the rear end of the second vertical plate;

[0017] The first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder are both rectangular plates; a clearance opening is opened at the left end of the first side plate of the scraper storage cylinder and the left end of the second side plate of the scraper storage cylinder, and the clearance opening is composed of two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the bottom plate are located in the same horizontal plane;

[0018] The clearance openings on the first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder are arranged opposite to each other.

[0019] A further improvement of the present invention is that a second electric cylinder mounting plate is mounted on the outer wall of the second vertical plate, and a second electric cylinder is mounted on the second electric cylinder mounting plate;

[0020] A hole is formed on the second vertical plate, and the second telescopic rod of the second electric cylinder passes through the hole and extends into the inner cavity of the scraper storage cylinder body;

[0021] The central axis of the second telescopic rod is parallel to the bottom plate and perpendicular to the second vertical plate.

[0022] A further improvement of the present invention is that the scraper recovery cylinder comprises a scraper recovery cylinder bottom plate, and a first scraper recovery cylinder side plate and a second scraper recovery cylinder side plate are respectively installed on both sides of the scraper recovery cylinder bottom plate;

[0023] The first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are arranged in parallel, and both are perpendicular to the bottom plate of the scraper recovery cylinder;

[0024] A scraper recovery cylinder front plate and a scraper recovery cylinder rear plate are respectively installed on the other two sides of the scraper recovery cylinder bottom plate, and the scraper recovery cylinder front plate and the scraper recovery cylinder rear plate are arranged in parallel and are both perpendicular to the scraper recovery cylinder bottom plate, and perpendicular to the scraper recovery cylinder first side plate and the scraper recovery cylinder second side plate;

[0025] The front end of the scraper recovery cylinder front plate is connected to the left end inner wall of the first side plate of the scraper recovery cylinder, and the rear end is connected to the left end inner wall of the second side plate of the scraper recovery cylinder; the front end of the scraper recovery cylinder rear plate is connected to the right end inner wall of the first side plate of the scraper recovery cylinder, and the rear end is connected to the right end inner wall of the second side plate of the scraper recovery cylinder;

[0026] The first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are both rectangular plates; a clearance opening is respectively opened at the left end of the first side plate of the scraper recovery cylinder and the left end of the second side plate of the scraper recovery cylinder, and the clearance opening is formed by two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the bottom plate of the recovery cylinder are located in the same horizontal plane;

[0027] The clearance openings on the first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are arranged opposite to each other.

[0028] A further improvement of the present invention is that a first electric cylinder mounting plate is mounted on the outer wall of the rear plate of the scraper recovery cylinder, and a first electric cylinder is mounted below the first electric cylinder mounting plate;

[0029] A hole is opened on the rear plate of the scraper recovery cylinder, and the first telescopic rod of the first electric cylinder passes through the hole and extends into the inner cavity of the scraper recovery cylinder;

[0030] A recovery plate is connected to the end of the first telescopic rod; the recovery plate is a long strip plate, the lower end of which is connected to the end of the telescopic rod, and the recovery plate is perpendicular to the central axis of the first telescopic rod;

[0031] A longitudinal groove extending from top to bottom is provided in the middle of the inner wall of the front plate of the scraper recovery cylinder, and when the first telescopic rod is extended to the longest position, the recovery pull plate is located in the longitudinal groove;

[0032] A transverse groove is opened from left to right in the middle of the recovery cylinder bottom plate, the left end of the transverse groove is connected with the lower end of the longitudinal groove, and the first telescopic rod is located in the transverse groove and can move back and forth along the transverse groove.

[0033] A further improvement of the present invention is that horizontally arranged limit strips are respectively installed on the inner walls of the first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder; each limit strip is a strip-shaped structure, and the limit strips on both sides are located in the same horizontal plane and are perpendicular to the first vertical plate and the second vertical plate;

[0034] Horizontally arranged limit strips are respectively installed on the inner walls of the first side plate and the second side plate of the scraper recovery cylinder. Each limit strip is a strip structure. The limit strips on both sides are located in the same horizontal plane and are perpendicular to the front plate and the rear plate of the scraper recovery cylinder.

[0035] A further improvement of the present invention is that the powder spreading device comprises a top connecting plate; a first side guard plate and a second side guard plate are symmetrically installed on both sides of the top connecting plate;

[0036] The first side guard plate and the second side guard plate are arranged in parallel, and both are perpendicular to the top connecting plate;

[0037] A first bottom guard plate is connected below the first side guard plate, and a second bottom guard plate is connected below the second side guard plate;

[0038] A motor mounting plate is installed on the upper portion of the outer wall of the first side guard plate, and a motor is installed on the motor mounting plate;

[0039] A gear is connected to the output shaft of the motor;

[0040] The central axis of the gear is located above the top connecting plate, and a rack is provided below the top connecting plate; a hole is provided at the front end of the top connecting plate, and the lower part of the gear is meshed with the rack after passing through the hole; the central axis of the output shaft of the motor is perpendicular to the rack;

[0041] The upper end of the scraper limiting plate is connected to the lower end of the rack; steps are respectively provided on both sides of the scraper limiting plate along its length direction; a groove with an opening facing downward is provided at the lower part of the scraper limiting plate;

[0042] A first guide plate is installed on the front outer surface of the first side guard plate, and a second guide plate is installed on the front outer surface of the second side guard plate; the first guide plate and the second guide plate are arranged parallel and opposite to each other;

[0043] The first guide plate and the second guide plate each include a mounting plate and a track plate connected in one piece; the track plate is perpendicular to the mounting plate, and the rear end of the track plate is connected to the front end outer surface of the mounting plate, and the front end of the track plate is suspended; the track plate includes a horizontal track surface and a vertical track surface that are perpendicular to each other, and the horizontal track surface and the vertical track surface are both perpendicular to the mounting plate;

[0044] A notch is provided at one corner of the mounting plate, and the notch is aligned with the rear end of the track plate.

[0045] A further improvement of the present invention is that each scraper is respectively connected to a scraper base;

[0046] The scraper base is a rectangular parallelepiped structure, and a horizontal rectangular annular step is arranged in the middle of the scraper base;

[0047] The two steps in the width direction of the scraper base can respectively cooperate with the limit strips on the scraper recovery cylinder and the scraper storage cylinder;

[0048] The two steps in the length direction of the scraper base can be supported by the first bottom guard plate and the second bottom guard plate respectively.

[0049] According to a second aspect of the present invention, an additive manufacturing device is provided; a scraper storage cylinder and a scraper recovery cylinder in the above-mentioned system are arranged on one side of a machining plane in a molding chamber of the additive manufacturing device, and a powder spreading device in the above-mentioned system is connected to a horizontal driving structure of the additive manufacturing device.

[0050] A third aspect of the present invention provides a method for replacing a scraper of an additive manufacturing device, the method comprising:

[0051] When the working scraper needs to be replaced, the powder spreading device moves horizontally to the top of the scraper recovery cylinder, and when the gap between the first guide plate and the second guide plate is located directly above the clearance opening of the scraper recovery cylinder, the powder spreading device stops moving;

[0052] The motor is started, and the motor drives the rack through the gear, thereby driving the scraper limiting plate to extend along the first guide plate and the second guide plate, and the motor is stopped when the two ends of the scraper limiting plate are respectively located at the two yielding openings of the scraper recovery cylinder;

[0053] Start the first electric cylinder, and the first telescopic rod of the first electric cylinder pulls back the scraper recovery plate, and the scraper recovery plate drives the scraper base and the scraper to move toward the direction close to the rear plate of the scraper recovery cylinder, and recovers the scraper that needs to be replaced; after the scraper recovery is completed, the scraper recovery plate is driven by the first telescopic rod back to the longitudinal groove on the front plate of the scraper recovery cylinder; at the same time, the powder spreading device moves horizontally to the top of the scraper storage cylinder;

[0054] When the two ends of the scraper limiting plate are respectively located at the two clearance openings of the scraper storage cylinder, the powder spreading device stops moving. At this time, the scraper base of the reserve scraper located in the scraper storage cylinder and aligned with the clearance opening is located in the groove of the scraper limiting plate. The motor is started, and the scraper limiting plate drives the reserve scraper to move into the powder spreading device.

[0055] Move the powder spreading device horizontally back to the processing plane to continue processing; at the same time, the second telescopic rod of the second electric cylinder extends to push the remaining preparatory scrapers toward the first vertical plate, so that the first preparatory scraper is aligned with the clearance opening on the scraper storage cylinder.

[0056] Compared with the prior art, the present invention has the following beneficial effects:

[0057] 1. The electric scraper replacement and powder spreading system provided by the present invention can replace the working scraper without opening the molding processing chamber when the scraper is damaged after the powder spreading device is installed, thereby improving the processing efficiency to a certain extent.

[0058] 2. The scraper storage cylinder of the present invention can store multiple scrapers at the same time, and the scraper recovery cylinder can recover multiple scrapers. Multiple scrapers can be replaced at one time, and the scraper replacement cycle can be extended, which reduces the workload of replacing scrapers to a certain extent, increases continuous processing time, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A top view of the overall layout of the electric scraper replacement powder spreading system of the present invention;

[0060] Figure 2 A front view of a powder spreading device in a powder spreading system in which an electric scraper is replaced according to the present invention;

[0061] Figure 3-1 Figure 2 AA section view in;

[0062] Figure 3-2 A schematic diagram of the three-dimensional structure of a scraper limiting plate in a powder spreading device in a powder spreading system in which an electric scraper is replaced;

[0063] Figure 3-3 A schematic diagram of the three-dimensional structure of a guide plate in a powder spreading device in a powder spreading system in which an electric scraper is replaced according to the present invention;

[0064] Figure 3-4 A schematic bottom-up view of the structure of a guide plate in a powder spreading device in a powder spreading system in which an electric scraper is replaced according to the present invention;

[0065] Figure 4 A top view of a scraper recovery cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0066] Figure 5 Figure 4 BB section view in;

[0067] Figure 6-1 A front view of a scraper recovery cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0068] Figure 6-2 A schematic diagram of the three-dimensional structure of a scraper recovery cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0069] Figure 7 A top view of a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0070] Figure 8-1 A front view of a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0071] Figure 8-2 A schematic diagram of the three-dimensional structure of a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0072] Figure 8-3 A schematic diagram of the structure of a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention from a left side;

[0073] Figure 8-4 A schematic diagram of the three-dimensional structure of a side plate of a scraper storage cylinder in a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0074] Figure 8-5 A schematic diagram of the three-dimensional structure of a scraper storage cylinder body in a scraper storage cylinder in a powder spreading system for replacing an electric scraper according to the present invention;

[0075] Figure 8-6 A schematic diagram of the three-dimensional structure of a scraper base in a powder spreading system for replacing an electric scraper according to the present invention;

[0076] Fig. 9 A schematic structural diagram of the electric scraper replacement powder spreading system of the present invention with the scraper limiting plate in an extended state;

[0077] Fig.10 The state when the powder spreading device is located above the scraper recovery cylinder;

[0078] Fig.11 The state when the powder spreading device is located above the scraper storage cylinder;

[0079] Figure numerals: 1-scraper replacement area; 2-scraper storage cylinder; 3-scraper recovery cylinder; 4-powder spreading device; 5-scraper; 6-first scraper base; 7-first bottom guard plate; 8-first side guard plate; 9-first guide plate; 10-motor mounting plate; 11-motor; 12-gear; 13-rack; 14-top connecting plate; 15-second side guard plate; 16-second guide plate; 17-scraper limiting plate; 18-second bottom guard plate; 19-first side plate of scraper recovery cylinder; 20-scraper recovery Cylinder front plate; 21-scraper recovery pull plate; 22-first telescopic rod; 23-scraper recovery cylinder bottom plate; 24-scraper recovery cylinder second side plate; 25-scraper recovery cylinder rear plate; 26-first electric cylinder mounting plate; 27-first electric cylinder; 28-scraper storage cylinder first side plate; 29-scraper storage cylinder body; 30-second scraper base; 31-third scraper base; 32-fourth scraper base; 33-scraper storage cylinder second side plate; 34-second electric cylinder; 35-second telescopic rod; 36-second electric cylinder mounting plate. DETAILED DESCRIPTION

[0080] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0081] like Figure 1-Figure 11 As shown, an electric scraper replacement and powder spreading system includes a scraper storage cylinder 2, a scraper recovery cylinder 3 and a powder spreading device 4. The scraper storage cylinder 2 and the scraper recovery cylinder 3 are arranged in a scraper replacement area 1, and the scraper replacement area 1 is located on one side of the processing plane in the molding chamber of the additive manufacturing device. Preferably, the horizontal height of the scraper replacement area 1 is slightly lower than the molding plane of the additive manufacturing device to facilitate scraper replacement. A plurality of prepared scrapers are stored in the scraper storage cylinder; the scraper recovery cylinder is used to recover the replaced scrapers; the powder spreading device includes a scraper limiting plate, and a scraper is arranged in the scraper limiting plate; when the powder spreading device is located above the scraper recovery cylinder, the scraper limiting plate extends to place the scraper in the scraper recovery cylinder, and when the powder spreading device is located above the scraper storage cylinder, the scraper limiting plate retracts to install the scraper on the powder spreading device.

[0082] like Figure 1 As shown, the scraper storage cylinder 2, the scraper recovery cylinder 3 and the powder spreading device 4 are arranged in sequence from left to right.

[0083] The embodiments of the electric scraper replacement powder spreading system of the present invention are as follows:

[0084] [Example 1]

[0085] like Figure 7 As shown, the scraper storage cylinder 2 includes a scraper storage cylinder body 29, as shown in FIG. Figure 8-6As shown, the scraper storage cylinder body 29 includes a first vertical plate 2901, a bottom plate 2903 and a second vertical plate 2902 which are connected as a whole. Specifically, the first vertical plate 2901 and the second vertical plate 2902 are arranged in parallel and are both perpendicular to the bottom plate 2903. The lower end of the first vertical plate 2901 is connected to one end of the bottom plate 2903, and the lower end of the second vertical plate 2902 is connected to the other end of the bottom plate 2903. The three form a concave structure.

[0086] like Figure 8-1 to Figure 8-5 As shown, the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder are symmetrically installed on both sides of the scraper storage cylinder body 29, and the two are arranged in parallel and are both perpendicular to the bottom plate 2903, and are also perpendicular to the first vertical plate 2901 and the second vertical plate 2902. The length of the first vertical plate 2901 and the second vertical plate 2902 is equal to the distance between the inner wall of the first side plate 28 of the scraper storage cylinder and the inner wall of the second side plate 33 of the scraper storage cylinder.

[0087] Specifically, the left inner wall of the first side plate 28 of the scraper storage cylinder is fixedly connected to the front end of the first vertical plate 2901, and the right inner wall is fixedly connected to the front end of the second vertical plate 2902. The left inner wall of the second side plate 33 of the scraper storage cylinder is fixedly connected to the rear end of the first vertical plate 2901, and the right inner wall is fixedly connected to the rear end of the second vertical plate 2902. That is, the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder clamp the first vertical plate 2901 and the second vertical plate 2902.

[0088] The first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder are both rectangular plates, and a clearance opening is opened at the left end of the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder. The clearance opening is a gap formed by cutting a small rectangular block at the upper left corner of the rectangular plate. The gap is composed of two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the bottom plate are located in the same horizontal plane. The clearance openings on the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder are arranged opposite to each other, and the two clearance openings are used to allow the scraper limiting plate 17 to pass through.

[0089] [Example 2]

[0090] A second electric cylinder mounting plate 36 is mounted on the outer wall of the second vertical plate 2902, and a second electric cylinder 34 is mounted on the second electric cylinder mounting plate 36. Meanwhile, a hole is formed on the second vertical plate 2902, and a second telescopic rod 35 of the second electric cylinder 34 passes through the hole and extends into the inner cavity of the scraper storage cylinder body 29. The central axis of the second telescopic rod 35 is parallel to the bottom plate 2903 and perpendicular to the second vertical plate 2902.

[0091] [Example 3]

[0092] Horizontally arranged limiting strips are respectively installed on the inner walls of the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder. Figure 8-4 As shown, the limiting strip is a strip-shaped structure, the limiting strips on both sides are located in the same horizontal plane, and their length direction is parallel to the length direction of the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder, that is, the two limiting strips are perpendicular to the first vertical plate 2901 and the second vertical plate 2902, and one side of the two limiting strips in the length direction is fixedly connected to the inner wall of the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder, respectively, and the other side in the length direction is suspended. The limiting strip is used to limit the scraper base.

[0093] When in use, a plurality of parallel scrapers are stored in the scraper storage cylinder body 29, each scraper is connected to a scraper base, and the two ends of the scraper base are respectively limited by the limit bars on both sides. The scraper base connected to each scraper is parallel to the first vertical plate and the second vertical plate, and the second telescopic rod 35 can simultaneously push all scrapers to move in the direction close to the clearance opening (i.e., in the direction close to the first vertical plate 2901). When the scraper base reaches the clearance opening, the scraper base and the scraper can come out of the clearance opening along its length direction.

[0094] Figure 7 In the illustrated embodiment, the second scraper base 30, the third scraper base 31 and the fourth scraper base 32 are pre-stored in the scraper storage cylinder 2, and a reserve scraper is installed below the second scraper base 30, the third scraper base 31 and the fourth scraper base 32 for scraper replacement. In actual use, the size of the scraper storage cylinder body 29 and the number of reserve scrapers placed therein can be designed as needed.

[0095] [Example 4]

[0096] like Figure 4 As shown, the scraper recovery cylinder 3 includes a scraper recovery cylinder bottom plate 23, and a scraper recovery cylinder first side plate 19 and a scraper recovery cylinder second side plate 24 are respectively installed on both sides of the scraper recovery cylinder bottom plate 23, the scraper recovery cylinder first side plate 19 and the scraper recovery cylinder second side plate 24 are arranged in parallel, and both are perpendicular to the scraper recovery cylinder bottom plate 23, wherein the lower end of the scraper recovery cylinder first side plate 19 is connected to the front end of the scraper recovery cylinder bottom plate 23, and the lower end of the scraper recovery cylinder second side plate 24 is connected to the rear end of the scraper recovery cylinder bottom plate 23.

[0097] A scraper recovery cylinder front plate 20 and a scraper recovery cylinder rear plate 25 are respectively installed on the other two sides of the scraper recovery cylinder bottom plate 23. The scraper recovery cylinder front plate 20 and the scraper recovery cylinder rear plate 25 are arranged in parallel and are both perpendicular to the scraper recovery cylinder bottom plate 23, and perpendicular to the scraper recovery cylinder first side plate 19 and the scraper recovery cylinder second side plate 24. The length of the scraper recovery cylinder front plate 20 and the scraper recovery cylinder rear plate 25 is equal to the distance between the inner wall of the scraper recovery cylinder first side plate 19 and the inner wall of the scraper recovery cylinder second side plate 24.

[0098] The front end of the scraper recovery cylinder front plate 20 is connected to the left end inner wall of the first side plate 19 of the scraper recovery cylinder, and the rear end is connected to the left end inner wall of the second side plate 24 of the scraper recovery cylinder. The front end of the scraper recovery cylinder rear plate 25 is connected to the right end inner wall of the first side plate 19 of the scraper recovery cylinder, and the rear end is connected to the right end inner wall of the second side plate 24 of the scraper recovery cylinder, which is equivalent to the first side plate 19 of the scraper recovery cylinder and the second side plate 24 of the scraper recovery cylinder clamping the scraper recovery cylinder front plate 20 and the scraper recovery cylinder rear plate 25.

[0099] like Figure 6-1 , Figure 6-2 As shown, the first side plate 19 of the scraper recovery cylinder and the second side plate 24 of the scraper recovery cylinder are both rectangular plates, and a clearance opening is respectively opened at the left end of the first side plate 19 of the scraper recovery cylinder and the second side plate 24 of the scraper recovery cylinder. The clearance opening is a gap formed by cutting off a small rectangular block at the upper left corner of the rectangular plate, and the gap is formed by two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the recovery cylinder bottom plate 23 are located in the same horizontal plane. The clearance openings on the first side plate 19 of the scraper recovery cylinder and the second side plate 24 of the scraper recovery cylinder are arranged oppositely, and the two clearance openings are used to allow the scraper limiting plate 17 to pass through.

[0100] [Example 5]

[0101] A first electric cylinder mounting plate 26 is mounted on the outer wall of the scraper recovery cylinder rear plate 25, and a first electric cylinder 27 is mounted below the first electric cylinder mounting plate 26. Figure 5 shown.

[0102] A hole is formed on the rear plate 25 of the scraper recovery cylinder, and the first telescopic rod 22 of the first electric cylinder 27 passes through the hole and extends into the inner cavity of the scraper recovery cylinder 3 .

[0103] A recovery plate 21 is connected to the end of the first telescopic rod 22 . The recovery plate 21 is a long strip plate, the lower end of which is connected to the end of the telescopic rod 22 , and the recovery plate 21 is perpendicular to the central axis of the first telescopic rod 22 .

[0104] A longitudinal groove from top to bottom is opened in the middle of the inner wall of the scraper recovery cylinder front plate 20. When the first telescopic rod 22 is extended to its longest, the recovery pull plate 21 is located in the longitudinal groove. At this time, the surface of the recovery pull plate 21 on the side connected to the first telescopic rod 22 is located in the same plane as the inner wall of the scraper recovery cylinder front plate 20, so that the recovery pull plate 21 will not hinder the scraper from entering and exiting.

[0105] A transverse groove is opened from left to right in the middle of the recovery cylinder bottom plate 23, and the left end of the transverse groove is connected with the lower end of the longitudinal groove. The lower end of the recovery pull plate 21 is located in the transverse groove and can move in the transverse groove. The first telescopic rod 22 is located in the transverse groove and can reciprocate along the transverse groove. Since the first telescopic rod 22 is located in the inner cavity of the transverse groove, the telescopic rod will not interfere with the scraper located above it, and can move back and forth freely, and at the same time can pull the recovery pull plate 21 to move along the transverse groove on the bottom plate.

[0106] [Example 6]

[0107] Preferably, horizontally arranged limit bars are respectively installed on the inner walls of the first side plate 19 and the second side plate 24 of the scraper recovery cylinder, each limit bar is a strip-shaped structure, the limit bars on both sides are located in the same horizontal plane, and are both perpendicular to the front plate 20 and the rear plate 25 of the scraper recovery cylinder, one edge of the two limit bars in the length direction is respectively fixedly connected to the inner walls of the first side plate 19 and the second side plate 24 of the scraper recovery cylinder, and the other edge in the length direction is suspended. The function of the limit bars on both sides is the same as that of the limit bars in the scraper storage cylinder.

[0108] When the scraper to be recovered enters the recovery cylinder from the yield port, the first telescopic rod 22 drives the recovery pull plate 21 to move in the retracting direction (i.e., in the direction close to the rear portion 25 of the scraper recovery cylinder) to recover the scraper into the scraper recovery cylinder. Subsequently, the first telescopic rod 22 drives the recovery pull plate 21 back to its original position (i.e., back to the longitudinal groove), and the scraper is limited by the limit strips on both sides to prevent it from tipping over.

[0109] After installation, the first vertical plate on the scraper storage cylinder 2 is close to the scraper recovery cylinder front plate 20 on the scraper recovery cylinder 3, and the two are arranged oppositely, and the two make way openings on the scraper storage cylinder correspond to the two make way openings on the scraper recovery cylinder respectively.

[0110] The first electric cylinder and the second electric cylinder in the above embodiment may be existing hydraulic cylinders or pneumatic cylinders equipped with telescopic rods, which will not be described in detail here.

[0111] [Example 7]

[0112] like Figure 2As shown, the powder spreading device 4 includes a top connecting plate 14, and a first side guard plate 8 and a second side guard plate 15 are symmetrically installed on both sides of the top connecting plate 14. The first side guard plate 8 and the second side guard plate 15 are arranged in parallel, and both are perpendicular to the top connecting plate 14. The upper end of the first side guard plate 8 is connected to the lower surface of the left end of the top connecting plate, and the upper end of the second side guard plate 15 is connected to the lower surface of the right end of the top connecting plate.

[0113] The first bottom guard plate 7 is connected below the first side guard plate 8, and the second bottom guard plate 18 is connected below the second side guard plate 15. The first bottom guard plate 7 and the second bottom guard plate 18 are used to limit the scraper base in the vertical direction. The left end of the first bottom guard plate 7 is fixedly connected to the lower end of the first side guard plate 8, and the right end of the second bottom guard plate 18 is fixedly connected to the lower end of the second side guard plate 15. The right end of the first bottom guard plate 7 and the left end of the second bottom guard plate 18 form an outlet, and the scraper can extend from the outlet to the bottom of the bottom guard plate.

[0114] The first side guard plate 8 is close to the scraper recovery cylinder 3, and a motor mounting plate 10 is installed on the upper part of the outer wall of the first side guard plate 8. A motor 11 is installed on the motor mounting plate 10. A gear 12 is connected to the output shaft of the motor 11.

[0115] A horizontally arranged rack 13 is meshed and installed below the gear 12. The central axis of the output shaft of the motor 11 is perpendicular to the rack 13. The central axis of the gear 12 is located above the top connecting plate 14, and the rack 13 is located below the top connecting plate 14. A hole is opened at the front end of the top connecting plate 14, and the lower part of the gear 12 is meshed with the rack after passing through the hole. When the gear 12 rotates, the gear 12 drives the rack 13 to move in a straight line. In order to ensure that the rack 13 is not completely separated from the gear 12, the length of the rack 13 is greater than the length of the scraper limiting plate 17, and the rack 13 is flush with the front end of the scraper limiting plate 17, and the rear end of the rack 13 extends backwards, as shown in FIG. Figure 3-1 As shown, when both ends of the scraper limiting plate are located in the clearance opening, the rear end of the rack 13 is still engaged with the gear.

[0116] like Figure 3-1 As shown, a scraper limiting plate 17 is connected below the rack 13. Figure 3-2 As shown, steps are respectively provided on both sides of the scraper limiting plate 17 along its length direction, and the steps on both sides make the cross-section of the scraper limiting plate 17 T-shaped.

[0117] like Figure 3-2As shown, a groove with an opening facing downward is formed at the lower part of the scraper limiting plate 17, the length direction of the groove is parallel to the length direction of the scraper limiting plate, the length and width of the groove match the length and width of the scraper base, but is not connected to the scraper base, the scraper base can enter the groove from one side and be located in the groove, and can also leave the groove from one side. In this way, when the scraper base is located in the groove, the two ends of the scraper limiting plate can drive the scraper base to move along its length direction, but cannot limit the movement of the scraper base along its width direction, thereby realizing the recovery and installation of the scraper.

[0118] In this embodiment, a first scraper base 6 is placed in the groove of the scraper limiting plate 17 , and a first scraper 5 is installed below the first scraper base 6 .

[0119] A first guide plate 9 is mounted on the front outer surface of the first side guard plate 8, and a second guide plate 16 is mounted on the front outer surface of the second side guard plate 15. The first guide plate 9 and the second guide plate 16 are arranged parallel and opposite to each other, and are used to guide the scraper limiting plate 17.

[0120] Specifically, Figure 3-3 and Figure 3-4 As shown, the first guide plate 9 and the second guide plate 16 both include an integral mounting plate and a track plate, the track plate is perpendicular to the mounting plate, and the rear end of the track plate is connected to the front end outer surface of the mounting plate, the front end of the track plate is suspended, and the cross-sectional shape of the track plate is L-shaped, including a horizontal track surface and a vertical track surface, the horizontal track surface is perpendicular to the vertical track surface, and both the horizontal track surface and the vertical track surface are perpendicular to the mounting plate.

[0121] A notch is provided at one corner of the mounting plate, and the notch is aligned with the rear end of the track plate, and the notch is connected to the rear end of the track plate. The notch matches the L-shape of the track plate, that is, the rear end of the horizontal track surface is connected to the lower end of the notch, and the rear end of the vertical track surface is connected to the mounting plate. The scraper limiting plate 17 can enter the track plate through the notch, and the steps on both sides of the scraper limiting plate 17 can be supported by the first guide plate 9 and the second guide plate 16 respectively.

[0122] Furthermore, in order to enhance the supporting strength, a plurality of ribs are arranged below the horizontal track surface. The ribs are perpendicular to the horizontal track surface, and the upper ends of the ribs are connected to the lower end surface of the track plate, and the rear ends are connected to the front end outer surface of the mounting plate. Preferably, each rib is a triangular structure.

[0123] During installation, the mounting plate is parallel to the front end surface of the side guard plate, and the rear end outer surface of the mounting plate is connected to the front end outer surface of the side guard plate. Bolt connection or the like can be used. There is no specific requirement for the connection method, and a fixed connection can be achieved, which can be determined according to actual needs.

[0124] After installation, the first guide plate 9 and the second guide plate 16 are arranged opposite to each other (i.e., the track plate of the first guide plate 9 is L-shaped, and the track plate of the second guide plate 16 is L-shaped after horizontal flipping), and the horizontal track surfaces in the track plates of the two are located in the same horizontal plane, and the scraper limiting plate 17 can enter between the first guide plate 9 and the second guide plate 16, and the steps on both sides of the scraper limiting plate 17 can contact the upper surface of the horizontal track surface of the first guide plate 9 and the second guide plate 16 respectively. The scraper limiting plate 17 enters above the horizontal track surface from the notches on the first guide plate 9 and the second guide plate 16, and the L-shaped track plate can guide and support the scraper limiting plate to move along the length direction of the track plate.

[0125] [Embodiment 8]

[0126] like Figure 8-5 As shown, the scraper base is a rectangular structure, and a horizontal rectangular annular step is arranged in the middle of the scraper base, that is, steps are arranged on the four sides of the scraper base, and the steps on the four sides are located on the same horizontal plane, and the four steps are connected end to end in sequence to form a rectangular annular step.

[0127] The two steps on the width direction of the scraper base are used to cooperate with the limit strips on the scraper recovery cylinder and the scraper storage cylinder respectively to prevent the scraper base from tipping over. When in use, the scraper is connected to the bottom of the scraper base. When the scraper base is placed in the scraper storage cylinder, the two steps on the width direction of the scraper base are respectively in contact with the limit strips on the first side plate 28 of the scraper storage cylinder and the second side plate 33 of the scraper storage cylinder, and then the limit strips are used to limit the vertical direction of each scraper base, guide horizontally and prevent tipping. Similarly, the limit strips in the scraper recovery cylinder also limit the vertical direction of each scraper base, guide horizontally and prevent tipping.

[0128] The two steps in the length direction of the scraper base are used to clamp on the first bottom guard plate 7 and the second bottom guard plate 18 for vertical positioning.

[0129] A structure connected to the scraper is provided below the rectangular annular step of the scraper base. The structure can be the existing structure for connecting the scraper base to the scraper (for example Figure 8-5 The structure with a semi-arc groove shown in FIG. 1 is not described in detail here.

[0130] The present invention also provides an additive manufacturing device, on which the above-mentioned electric scraper replacement powder spreading system is installed. Specifically, a scraper storage cylinder and a scraper recovery cylinder in the above-mentioned system are arranged on one side of the processing plane in the molding chamber of the additive manufacturing device, and the powder spreading device in the above-mentioned system is installed on the horizontal driving structure of the powder spreading device in the processing chamber of the additive manufacturing device. When the present invention is installed in the additive manufacturing device, other parts of the original equipment are not modified, and only the position, size, and connection parts need to be matched and designed according to the structure of the present invention, which will not be repeated here.

[0131] The method for replacing the scraper of the above-mentioned additive manufacturing equipment is as follows:

[0132] When the working scraper needs to be replaced: the powder spreading device moves horizontally to the top of the scraper recovery cylinder in the scraper replacement area. During the movement, the first guide plate and the second guide plate pass over the top of the scraper recovery cylinder. When the gap between the first guide plate and the second guide plate is located directly above the clearance opening of the scraper recovery cylinder, the movement of the powder spreading device is stopped. Fig.10 shown.

[0133] Then start the motor 11, the motor 11 drives the rack 14 through the gear 12, and then drives the scraper limiting plate 17 to extend along the first guide plate and the second guide plate, the steps on both sides of the scraper limiting plate are limited and supported by the track plates of the guide plates on both sides, the scraper limiting plate drives the scraper base and the scraper to gradually extend, the scraper limiting plate drives the scraper base and the scraper from the give way on one side of the scraper recovery cylinder into the inner cavity of the scraper recovery cylinder, the steps on both sides of the scraper base in the length direction and the contact surface with the first bottom guard plate 7 and the second bottom guard plate 18 becomes smaller and smaller, when the scraper limiting plate is extended into place, as shown in FIG. Fig. 9 As shown, the motor 11 is stopped. At this time, the two ends of the scraper limiting plate are respectively located at the two makeshift openings of the scraper recovery cylinder, the scraper base is completely located in the inner cavity of the scraper recovery cylinder, and the steps on both sides of the scraper base in the length direction are no longer in contact with the first bottom guard plate 7 and the second bottom guard plate 18, that is, the first bottom guard plate 7 and the second bottom guard plate 18 no longer clamp the scraper base. Then the first electric cylinder 27 is started, and the first telescopic rod 22 of the first electric cylinder 27 pulls back the scraper recovery pull plate 21, and the scraper recovery plate 21 drives the scraper base and the scraper to move toward the direction close to the rear plate of the scraper recovery cylinder to recover the scraper that needs to be replaced.

[0134] After the scraper is recovered (i.e., the recovered scraper is moved to the position closest to the rear plate of the scraper recovery cylinder), the scraper recovery pull plate is driven by the first telescopic rod 22 to reset, that is, the first telescopic rod 22 of the first electric cylinder 27 drives the scraper recovery plate to move toward the front plate of the scraper recovery cylinder, and sends the scraper recovery plate 21 back to the longitudinal groove on the front plate of the scraper recovery cylinder. At the same time, the powder spreading device keeps the scraper limiting plate extended and moves horizontally to the top of the scraper storage cylinder in the scraper replacement area (in this process, the groove of the scraper limiting plate passes through the front plate of the scraper recovery cylinder and the first vertical plate of the scraper storage cylinder in turn). Fig.11 shown.

[0135] After the powder spreading device moves to the top of the scraper storage cylinder, when the two ends of the scraper limiting plate are respectively located at the two makeshift openings of the scraper storage cylinder, the powder spreading device stops moving. At this time, the scraper base of the preparatory scraper located in the scraper storage cylinder and aligned with the makeshift opening is located in the groove of the scraper limiting plate. The motor 11 is started, and the scraper limiting plate is retracted under the drive of the rack. During the retraction of the scraper limiting plate, the scraper limiting plate drives the pre-scraper to move, and the steps on both sides of the scraper base of the preparatory scraper in the length direction and the contact areas with the first bottom guard plate 7 and the second bottom guard plate 18 become larger and larger. When the scraper limiting plate is fully retracted, the steps on both sides of the scraper base of the preparatory scraper in the length direction are supported by the first bottom guard plate 7 and the second bottom guard plate 18 respectively. At this time, the new scraper is installed in the powder spreading device.

[0136] Then the powder spreading device is horizontally moved back to the processing plane to continue processing. At the same time, the second telescopic rod 35 of the scraper storage cylinder is extended to push the remaining preparatory scrapers toward the first vertical plate, so that the first preparatory scraper is aligned with the clearance opening on the scraper storage cylinder.

[0137] When the scraper recovery cylinder is filled with replaced scrapers, all the scrapers in the scraper recovery cylinder are taken out, and new reserve scrapers are added to the scraper storage cylinder at the same time.

[0138] In summary, when a scraper is needed, the powder spreading device can be horizontally moved to the scraper recovery cylinder in the scraper replacement area to replace the current working scraper, and then horizontally moved to the scraper storage cylinder to replace the standby scraper, thereby completing the replacement of the working scraper without opening the molding processing chamber, which improves the processing efficiency to a certain extent. There are multiple scrapers in the scraper storage cylinder and the scraper recovery cylinder of the powder spreading device at the same time, so multiple scrapers can be replaced at one time, which can extend the scraper replacement cycle of the powder spreading device, reduce the workload of replacing the scraper to a certain extent, increase the continuous processing time, and improve work efficiency.

[0139] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0140] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0141] Finally, it should be explained that the above technical solution is only one implementation method of the present invention. For those skilled in the art, it is easy to make various types of improvements or modifications based on the application methods and principles disclosed in the present invention, and it is not limited to the method described in the above specific implementation method of the present invention. Therefore, the method described above is only preferred and does not have a restrictive meaning.

Claims

1. An electric scraper replacement powder spreading system, characterized in that: The electric scraper replacement and powder spreading system comprises: a scraper storage cylinder, a scraper recovery cylinder and a powder spreading device; the scraper storage cylinder and the scraper recovery cylinder are arranged in the scraper replacement area; A plurality of prepared scrapers are stored in the scraper storage cylinder; The scraper recovery cylinder is used to recover the replaced scraper; The powder spreading device comprises a scraper limiting plate, in which a scraper is arranged; When the powder spreading device is located above the scraper recovery cylinder, the scraper limiting plate extends to place the scraper into the scraper recovery cylinder; when the powder spreading device is located above the scraper storage cylinder, the scraper limiting plate retracts to install the scraper on the powder spreading device; The scraper storage cylinder comprises a scraper storage cylinder body, and the scraper storage cylinder body comprises a first vertical plate, a bottom plate and a second vertical plate connected into one body; The first vertical plate and the second vertical plate are arranged in parallel and are perpendicular to the bottom plate; the lower end of the first vertical plate is connected to one end of the bottom plate, and the lower end of the second vertical plate is connected to the other end of the bottom plate, and the three form a concave structure; A first side plate of the scraper storage cylinder and a second side plate of the scraper storage cylinder are symmetrically installed on both sides of the scraper storage cylinder body, and the two are arranged in parallel and are both perpendicular to the bottom plate, and are also perpendicular to the first vertical plate and the second vertical plate; A clearance opening is provided at the left end of the first side plate of the scraper storage cylinder and the left end of the second side plate of the scraper storage cylinder. The clearance opening is composed of two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the bottom plate are located in the same horizontal plane; The first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder are disposed opposite to each other; A second electric cylinder mounting plate is mounted on the outer wall of the second vertical plate, and a second electric cylinder is mounted on the second electric cylinder mounting plate; A hole is formed on the second vertical plate, and the second telescopic rod of the second electric cylinder passes through the hole and extends into the inner cavity of the scraper storage cylinder body; The central axis of the second telescopic rod is parallel to the bottom plate and perpendicular to the second vertical plate.

2. The electric scraper replacement powder spreading system according to claim 1 is characterized by: The left inner wall of the first side plate of the scraper storage cylinder is fixedly connected to the front end of the first vertical plate, and the right inner wall is fixedly connected to the front end of the second vertical plate; The left inner wall of the second side plate of the scraper storage cylinder is fixedly connected to the rear end of the first vertical plate, and the right inner wall is fixedly connected to the rear end of the second vertical plate; The first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder are both rectangular plates.

3. The electric scraper replacement powder spreading system according to claim 2 is characterized by: The scraper recovery cylinder comprises a scraper recovery cylinder bottom plate, and a first scraper recovery cylinder side plate and a second scraper recovery cylinder side plate are respectively installed on both sides of the scraper recovery cylinder bottom plate; The first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are arranged in parallel, and both are perpendicular to the bottom plate of the scraper recovery cylinder; A scraper recovery cylinder front plate and a scraper recovery cylinder rear plate are respectively installed on the other two sides of the scraper recovery cylinder bottom plate, and the scraper recovery cylinder front plate and the scraper recovery cylinder rear plate are arranged in parallel and are both perpendicular to the scraper recovery cylinder bottom plate, and perpendicular to the scraper recovery cylinder first side plate and the scraper recovery cylinder second side plate; The front end of the scraper recovery cylinder front plate is connected to the left end inner wall of the first side plate of the scraper recovery cylinder, and the rear end is connected to the left end inner wall of the second side plate of the scraper recovery cylinder; the front end of the scraper recovery cylinder rear plate is connected to the right end inner wall of the first side plate of the scraper recovery cylinder, and the rear end is connected to the right end inner wall of the second side plate of the scraper recovery cylinder; The first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are both rectangular plates; a clearance opening is respectively opened at the left end of the first side plate of the scraper recovery cylinder and the left end of the second side plate of the scraper recovery cylinder, and the clearance opening is formed by two mutually perpendicular planes, wherein the plane parallel to the horizontal plane and the upper surface of the bottom plate of the recovery cylinder are located in the same horizontal plane; The clearance openings on the first side plate of the scraper recovery cylinder and the second side plate of the scraper recovery cylinder are arranged opposite to each other.

4. The electric scraper replacement powder spreading system according to claim 3 is characterized by: A first electric cylinder mounting plate is mounted on the outer wall of the scraper recovery cylinder rear plate, and a first electric cylinder is mounted below the first electric cylinder mounting plate; A hole is opened on the rear plate of the scraper recovery cylinder, and the first telescopic rod of the first electric cylinder passes through the hole and extends into the inner cavity of the scraper recovery cylinder; A recovery plate is connected to the end of the first telescopic rod; the recovery plate is a long strip plate, the lower end of which is connected to the end of the telescopic rod, and the recovery plate is perpendicular to the central axis of the first telescopic rod; A longitudinal groove extending from top to bottom is provided in the middle of the inner wall of the front plate of the scraper recovery cylinder, and when the first telescopic rod is extended to the longest position, the recovery pull plate is located in the longitudinal groove; A transverse groove is opened from left to right in the middle of the recovery cylinder bottom plate, the left end of the transverse groove is connected with the lower end of the longitudinal groove, and the first telescopic rod is located in the transverse groove and can move back and forth along the transverse groove.

5. The electric scraper replacement powder spreading system according to claim 4 is characterized by: Horizontally arranged limit strips are respectively installed on the inner walls of the first side plate of the scraper storage cylinder and the second side plate of the scraper storage cylinder; each limit strip is a strip-shaped structure, and the limit strips on both sides are located in the same horizontal plane and are perpendicular to the first vertical plate and the second vertical plate; Horizontally arranged limit strips are respectively installed on the inner walls of the first side plate and the second side plate of the scraper recovery cylinder. Each limit strip is a strip structure. The limit strips on both sides are located in the same horizontal plane and are perpendicular to the front plate and the rear plate of the scraper recovery cylinder.

6. The electric scraper replacement powder spreading system according to claim 5, characterized in that: The powder spreading device comprises a top connecting plate; a first side guard plate and a second side guard plate are symmetrically mounted on both sides of the top connecting plate; The first side guard plate and the second side guard plate are arranged in parallel, and both are perpendicular to the top connecting plate; A first bottom guard plate is connected below the first side guard plate, and a second bottom guard plate is connected below the second side guard plate; A motor mounting plate is installed on the upper portion of the outer wall of the first side guard plate, and a motor is installed on the motor mounting plate; A gear is connected to the output shaft of the motor; The central axis of the gear is located above the top connecting plate, and a rack is provided below the top connecting plate; a hole is provided at the front end of the top connecting plate, and the lower part of the gear is meshed with the rack after passing through the hole; the central axis of the output shaft of the motor is perpendicular to the rack; The upper end of the scraper limiting plate is connected to the lower end of the rack; steps are respectively provided on both sides of the scraper limiting plate along its length direction; a groove with an opening facing downward is provided at the lower part of the scraper limiting plate; A first guide plate is installed on the front outer surface of the first side guard plate, and a second guide plate is installed on the front outer surface of the second side guard plate; the first guide plate and the second guide plate are arranged parallel and opposite to each other; The first guide plate and the second guide plate each include a mounting plate and a track plate connected in one piece; the track plate is perpendicular to the mounting plate, and the rear end of the track plate is connected to the front end outer surface of the mounting plate, and the front end of the track plate is suspended; the track plate includes a horizontal track surface and a vertical track surface that are perpendicular to each other, and the horizontal track surface and the vertical track surface are both perpendicular to the mounting plate; A notch is provided at one corner of the mounting plate, and the notch is aligned with the rear end of the track plate.

7. The electric scraper replacement powder spreading system according to claim 6, characterized in that: Each scraper is respectively connected to a scraper base; The scraper base is a rectangular parallelepiped structure, and a horizontal rectangular annular step is arranged in the middle of the scraper base; The two steps in the width direction of the scraper base can respectively cooperate with the limit strips on the scraper recovery cylinder and the scraper storage cylinder; The two steps in the length direction of the scraper base can be supported by the first bottom guard plate and the second bottom guard plate respectively.

8. An additive manufacturing device, characterized in that: A scraper storage cylinder and a scraper recovery cylinder in the electric scraper replacement powder spreading system as described in any one of claims 1 to 7 are arranged on one side of the machining plane in the molding chamber of the additive manufacturing equipment, and a powder spreading device in the electric scraper replacement powder spreading system as described in any one of claims 1 to 7 is connected to the horizontal driving structure of the additive manufacturing equipment.

9. A method for replacing a scraper of an additive manufacturing device, the additive manufacturing device comprising the electric scraper replacement powder spreading system according to claim 7, characterized in that: The method comprises: When the working scraper needs to be replaced, the powder spreading device moves horizontally to the top of the scraper recovery cylinder, and when the gap between the first guide plate and the second guide plate is located directly above the clearance opening of the scraper recovery cylinder, the powder spreading device stops moving; The motor is started, and the motor drives the rack through the gear, thereby driving the scraper limiting plate to extend along the first guide plate and the second guide plate, and the motor is stopped when the two ends of the scraper limiting plate are respectively located at the two yielding openings of the scraper recovery cylinder; Start the first electric cylinder, and the first telescopic rod of the first electric cylinder pulls back the scraper recovery plate, and the scraper recovery plate drives the scraper base and the scraper to move toward the direction close to the rear plate of the scraper recovery cylinder, and recovers the scraper that needs to be replaced; after the scraper recovery is completed, the scraper recovery plate is driven by the first telescopic rod back to the longitudinal groove on the front plate of the scraper recovery cylinder; at the same time, the powder spreading device moves horizontally to the top of the scraper storage cylinder; When the two ends of the scraper limiting plate are respectively located at the two clearance openings of the scraper storage cylinder, the powder spreading device stops moving. At this time, the scraper base of the reserve scraper located in the scraper storage cylinder and aligned with the clearance opening is located in the groove of the scraper limiting plate. The motor is started, and the scraper limiting plate drives the reserve scraper to move into the powder spreading device. Move the powder spreading device horizontally back to the processing plane to continue processing; at the same time, the second telescopic rod of the second electric cylinder extends to push the remaining preparatory scrapers toward the first vertical plate, so that the first preparatory scraper is aligned with the clearance opening on the scraper storage cylinder.

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