Powder spreading device of SLM metal 3D printing equipment

Abstract

The utility model discloses a powder spreading device of SLM metal 3D printing equipment. The powder spreading device comprises a workbench plane. The two mounting plates are arranged in parallel; a driving assembly; the synchronizing shaft is in transmission connection with the driving assembly; the two groups of linear modules are respectively arranged on the two mounting plates, and the two groups of linear modules are respectively in transmission connection with the synchronizing shaft; the hoisting mechanism is fixedly connected with the moving ends of the two groups of linear modules respectively; the powder laying assembly comprises a powder leaking plate, the powder laying assembly is fixedly connected with the hoisting mechanism, the powder leaking plate is arranged at the bottom of the powder laying assembly and comprises a scraper, the scraper is arranged at the bottom of the powder leaking plate, and after metal powder is laid on the powder leaking plate in the moving direction of the powder laying assembly, the scraper is arranged at the bottom of the powder leaking plate. The scraper is used for scraping the metal powder; and when the powder laying assembly moves to any end, the reverser located at the end drives the powder leaking plate to lay the metal powder in a reversing mode.

Description

TECHNICAL FIELD

[0001] The utility model belongs to 3D printing field especially relates to a kind of powder laying device of SLM metal 3D printing equipment. BACKGROUND

[0002] In SLM metal 3D printing equipment, layer-by-layer sintering metal powder is key step, so layer-by-layer powder laying accurately is crucial.Powder laying device must have the condition of high straightness, high reference operation, to ensure the accuracy of powder laying.However, existing powder laying device often faces the following problems: first, powder laying device installation reference is inconsistent, powder leakage driving end is inconsistent, and affect the precision of powder laying;Second, the powder produced in the process of powder laying splashes and deposits in the key module of driving end, leading to poor straightness.In addition, most of the current traditional powder laying device is still mainly one-way powder laying: after each powder laying, the device needs to return to the origin empty, and this round trip process wastes a lot of time, and existing two-way powder laying device mostly relies on electric control system, and the equipment structure becomes complicated and complex, and also reduces the accuracy of powder laying due to inevitable delay. SUMMARY

[0003] To solve the above problems, the utility model provides a kind of powder laying device of SLM metal 3D printing equipment, which effectively solves the problem of powder laying precision decline caused by dust interference by dustproof treatment to driving module, and the device also introduces a unified installation reference, solves the problem of poor powder laying precision caused by inconsistent installation reference;In addition, the device uses single scraper to realize two-way powder laying, greatly simplifies mechanical structure, and significantly improves operation precision and efficiency.

[0004] To achieve the above object, the technical scheme of the utility model is: a powder spreading device of SLM metal 3D printing equipment, include: workbench plane, the flatness error of workbench plane is ± 0 and 01mm, two mutually parallel installation plates, two installation plates are located on workbench plane, the flatness error of installation plate is ± 0 and 01mm, drive assembly, including servo motor, speed reducer and shaft coupling, drive assembly is fixed on installation plate, servo motor is connected with speed reducer transmission, the power output end of speed reducer is connected with shaft coupling transmission, synchronous shaft is connected with shaft coupling transmission, two straight line modules are respectively arranged on two installation plates, two straight line modules are respectively connected with synchronous shaft transmission, hoisting mechanism is fixedly connected with the movement end of two straight line modules respectively, powder spreading assembly includes powder leakage plate, powder spreading assembly is fixedly connected with hoisting mechanism, powder leakage plate is located at the bottom of powder spreading assembly, powder leakage plate includes doctor blade, doctor blade is located at the bottom of powder leakage plate, after the metal powder is laid in the movement direction of powder spreading assembly, doctor blade carries out scraping treatment to metal powder, at least two reversers are respectively arranged at the two ends of the movement direction of powder spreading assembly, when powder spreading assembly moves to any one end, the reverser at the end drives powder leakage plate to lay metal powder reversely.

[0005] In an embodiment of the utility model, still include a plurality of stand, the bottom of two installation plate is fixed not less than two stand respectively, the other end of stand is fixed to workbench plane, the height error of stand is ± 0 and 02mm.

[0006] In an embodiment of the utility model, still include two groups of protective belt assembly, and each group of protective belt assembly includes two fixed seat, four pivot, sealing belt, sealing belt pressing plate, two fixed seat are located at the two ends of installation plate, four pivot are respectively located at the two ends of two fixed seat and are rotatably connected with fixed seat, the annular structure connected by sealing belt and sealing belt pressing plate surrounds four pivot.

[0007] In an embodiment of the utility model, the straight line module includes a slider, the slider is arranged on the driving end of the straight line module, the slider is fixedly connected with the inner end surface of the sealing belt pressing plate, the outer end surface of the sealing belt pressing plate is fixedly connected with the hoisting mechanism, when the straight line module moves, the slider drives the annular structure formed by the sealing belt and the sealing belt pressing plate to move in a ring shape, and the sealing belt pressing plate drives the hoisting mechanism to move.

[0008] In an embodiment of the utility model, the hoisting mechanism includes two connecting seats and two hangers, one end of two connecting seats is fixedly connected with the outer end surface of two sealing band pressure plates respectively, the other end of two connecting seats is connected with one end of two hangers respectively, the other end of two hangers is fixedly connected with the powder laying assembly respectively, the sealing band pressure plate movement drives the hoisting mechanism movement to realize the powder laying assembly movement.

[0009] In an embodiment of the utility model, the powder laying assembly further includes a powder groove seat and a reversing mechanism, the powder groove seat is arranged on the powder leakage plate, the powder groove seat and the powder leakage plate are slidably connected through the reversing mechanism, the powder groove seat is provided with a first powder groove opening and a second powder groove opening, the powder leakage plate is provided with a first leakage hole assembly and a second leakage hole assembly, when the powder laying assembly moves in a first direction, the first leakage hole assembly is aligned with the first powder groove opening, the second leakage hole assembly is not aligned with the second powder groove opening, so that the first leakage hole assembly lays powder, when the powder laying assembly moves to the limit position in the first direction, the reversing device at the limit position drives the reversing mechanism to slide in a second direction, so that the second leakage hole assembly is aligned with the second powder groove opening, and the first leakage hole assembly is not aligned with the first powder groove opening.

[0010] In an embodiment of the utility model, the reversing mechanism includes two sliding rails and two sliding tables, the two sliding rails are arranged at the bottom of both ends of the powder groove seat and are parallel to the movement direction, the sliding rails are provided with cavities, the cavities extend to the bottom of the powder groove seat, one end of the two sliding tables is arranged on the two sliding rails respectively, and the two sliding tables are fixedly connected with both ends of the powder leakage plate through the two cavities respectively.

[0011] In an embodiment of the utility model, the reversing mechanism further includes two groups of buckles, the two groups of buckles are arranged on the two end surfaces of the powder groove seat in the movement direction respectively, and are used for clamping the edges of the powder leakage plate.

[0012] In an embodiment of the utility model, the scraper is located at the central position between the two leakage hole assemblies, the distance between the two leakage hole assemblies is less than the distance between the two powder groove openings, and the length of the sliding rail is greater than or equal to half of the interval difference between the two leakage hole assemblies and the two powder groove openings.

[0013] In an embodiment of the utility model, the powder laying device of the SLM metal 3D printing equipment is included.

[0014] The utility model has the following advantages and positive effects compared with the prior art by adopting the above technical scheme:

[0015] (1) The embodiment of the utility model discloses mounting plate, stand, synchronous shaft and other components, and the mutual cooperation of components ensures the installation datum of powder laying device and the movement datum of powder laying assembly, effectively guaranteeing the precision of powder laying work.

[0016] (2) The embodiment of the utility model discloses two groups of protective belt assemblies, and each group of protective belt assemblies comprises a sealing belt, a sealing belt pressing plate, two fixed seats and four rotating shafts. The annular structure formed by the sealing belt and the sealing belt pressing plate surrounds the linear module, effectively preventing metal powder from depositing in the linear module and other components, thereby ensuring the operation precision of the linear module. The hoisting mechanism is fixedly connected with the sealing belt pressing plate, and the annular structure formed by the sealing belt and the sealing belt pressing plate moves through the driving of the linear module. The powder laying assembly fixedly connected with the hoisting mechanism moves through the driving of the sealing belt pressing plate, avoiding direct contact between the powder laying assembly and the linear module, further reducing the interference of metal powder on the linear module and other components, and guaranteeing the operation precision and reliability of the linear module.

[0017] (3) The embodiment of the utility model discloses a plurality of commutators, and the powder laying assembly comprises a powder leakage plate, a powder tank seat and a reversing mechanism. The powder leakage plate is provided with a scraper, and this structure realizes the bidirectional powder laying function of one scraper, and the mechanical structure is simple and responds quickly. The reversing mechanism is also provided with two groups of buckles for fixing the datum of the powder leakage plate for reversing, ensuring the working datum of the powder leakage assembly after switching, thereby guaranteeing the high precision of powder laying work. BRIEF DESCRIPTION OF DRAWINGS

[0018] The specific implementation of the utility model will be further described in detail below with reference to the drawings, wherein:

[0019] Figure 1 It is a three-dimensional structure diagram of the powder laying device of the SLM metal 3D printing equipment of the utility model;

[0020] Figure 2 It is a front view of the powder laying device of the SLM metal 3D printing equipment of the utility model;

[0021] Figure 3 It is a top view of the powder laying device of the SLM metal 3D printing equipment of the utility model;

[0022] Figure 4 It is a right view of the powder laying device of the SLM metal 3D printing equipment of the utility model, and the powder laying assembly is displayed;

[0023] Figure 5 It is a three-dimensional structure diagram of the powder laying device of the SLM metal 3D printing equipment of the utility model, and the powder laying assembly and the hoisting mechanism are connected;

[0024] Figure 6The utility model discloses a powder laying device of SLM metal 3D printing equipment shows powder laying subassembly and hoist mechanism connection front view.

[0025] Mark explanation:

[0026] 1: mounting plate, 2: drive assembly, 201: servo motor, 202: speed reducer, 203: shaft coupling, 3: synchronous shaft, 4: linear module, 401: slider, 5: hoist mechanism, 501: connecting seat, 502: hanger, 6: powder laying subassembly, 601: powder leakage plate, 60101: first leakage component, 60102: second leakage component, 60103: scraper, 602: powder tank seat, 60201: first powder tank, 60202: second powder tank, 60203: guard plate, 603: reversing mechanism, 60301: slide rail, 60302: slide table, 60303: buckle, 7: stand, 8: protective belt assembly, 801: sealing belt, 802: sealing belt pressing plate, 803: fixed seat, 804: rotating shaft, 9: reverser. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail below in combination with the drawings and specific embodiments. The advantages and features of the utility model will be more clear according to the following description and claims. It should be noted that the drawings are all very simplified and all use non-precise ratio, only to facilitate, clear and assist the purpose of explaining the utility model embodiment.

[0028] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the utility model embodiment are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directionality indications will also change accordingly.

[0029] Embodiment one

[0030] See Figure 1 , Figure 2 and Figure 4The utility model discloses a core provides a kind of powder laying device of SLM metal 3D printing equipment, comprising: workbench plane, the flatness error of workbench plane is ±0.01mm;Two mutually parallel installation plates 1, two installation plates 1 are located on workbench plane, the flatness error of installation plate 1 is ±0.01mm;Driving assembly 2, including servo motor 201, speed reducer 202 and coupling 203;Driving assembly 2 is fixed on installation plate 1, servo motor 201 is connected with speed reducer 202 transmission, the power output end of speed reducer 202 is connected with coupling 203 transmission;Synchronous shaft 3, with coupling 203 transmission connection;Two groups of linear modules 4 are respectively set on two installation plates 1, and two groups of linear modules 4 are respectively connected with synchronous shaft 3 transmission;Hoisting mechanism 5 is fixedly connected with the movement end of two groups of linear modules 4 respectively;Powder laying assembly 6, including powder leakage plate 601, powder laying assembly 6 is fixedly connected with hoisting mechanism 5, powder leakage plate 601 is located at the bottom of powder laying assembly 6, and powder leakage plate 601 includes doctor blade 60103, and doctor blade 60103 is located at the bottom of powder leakage plate 601, after laying metal powder in the movement direction of powder laying assembly 6, doctor blade 60103 carries out scraping flat treatment to metal powder;At least two reversers 9 are respectively arranged in the two ends of the movement direction of powder laying assembly 6, when powder laying assembly 6 moves to any one end, the reverser 9 located in the end drives powder leakage plate 601 to lay metal powder reversely.

[0031] When the powder laying device starts to work, servo motor 201 drives speed reducer 202, speed reducer 202 drives coupling 203, synchronous shaft 3, synchronous shaft 3 drives two groups of linear modules 4, and two groups of linear modules 4 drive the both ends of powder laying assembly 6 to move through hoisting mechanism 5, in the movement process, powder leakage plate 601 starts powder laying work, and doctor blade 60103 carries out scraping flat treatment to metal powder, when powder laying assembly 6 reaches the limit position of movement, the reverser 9 located in the limit position drives powder leakage plate 601 to work reversely, and simultaneously, the carrier of powder laying, forming cylinder, starts to descend to adapt the working height of doctor blade. In order to ensure the working precision of powder laying device, the installation plate 1 of powder laying device is arranged to ensure that powder laying assembly 6 lays powder at the same height, and synchronous shaft 3 drives linear module 4, and linear module 4 drives powder laying assembly 6 to realize that the straightness of powder laying assembly 6 movement is consistent and the consistency of doctor blade 60103 processing powder is consistent.

[0032] Referring to Figure 2 Preferably, further comprising several columns 7, the bottom of two installation plates 1 is fixed with not less than two columns 7 respectively, the other end of column 7 is fixed to workbench plane, and the height error of column 7 is ±0.02mm, to ensure that powder laying assembly 6 is arranged on fixed reference, so that metal powder always falls from uniform height, and then ensure the uniformity of powder laying.

[0033] Continuing to refer to Figure 1, preferably, the device further comprises two sets of protective belt assemblies 8, each set of protective belt assemblies 8 comprises two fixed seats 803, four rotating shafts 804, a sealing belt 801 and a sealing belt pressing plate 802, the two fixed seats 803 are arranged at the two ends of the mounting plate 1, the four rotating shafts 804 are arranged at the two ends of the two fixed seats 803 and are rotatably connected with the fixed seats 803, and the sealing belt 801 and the sealing belt pressing plate 802 are connected to form a ring structure around the four rotating shafts 804.

[0034] When the device does not install the two sets of protective belt assemblies 8, the powder spreading assembly 6 will produce splashed metal powder during powder spreading or printer sintering. These metal powders are easy to deposit in the space of the linear module 4, causing the linear module 4 to run abnormally, thereby affecting the running reference of the equipment. In order to restore the normal work of the module, it is necessary to clean the deposited powder regularly and re-adjust the equipment, which will consume a lot of working time. When the device is installed with the two sets of protective belt assemblies 8, the splashed metal powder produced by the powder spreading assembly 6 during powder spreading or printer sintering will be blocked outside by the ring structure formed by the sealing belt 801 and the sealing belt pressing plate 802. At the same time, the ring structure surrounds the four rotating shafts 804, ensuring that the protective belt assembly 8 surrounds the linear module 4 and the structure is stable, effectively preventing the deposition of metal powder in the linear module 4, thereby protecting the running reference of the equipment and reducing the maintenance time.

[0035] Referring to Figure 1 and Figure 2 , preferably, the linear module 4 comprises a sliding block 401 arranged at the driving end of the linear module 4, the sliding block 401 is fixedly connected with the inner end surface of the sealing belt pressing plate 802, the outer end surface of the sealing belt pressing plate 802 is fixedly connected with the hoisting mechanism 5, and when the linear module 4 moves, the sliding block 401 drives the ring structure formed by the sealing belt 801 and the sealing belt pressing plate 802 to move in a ring shape, and the sealing belt pressing plate 802 drives the hoisting mechanism 5 to move.

[0036] The sealing belt pressing plate 802 drives the hoisting mechanism 5 to move, and the hoisting mechanism 5 drives the powder spreading assembly 6 to move. This structure avoids the contact between the powder spreading assembly 6 and the linear module 4, reduces the deposition of metal powder in the space of the linear module 4, and ensures the working reference of the linear module 4.

[0037] Continuing to refer to Figure 1 and Figure 6 , preferably, the hoisting mechanism 5 comprises two connecting seats 501 and two hangers 502, one end of the two connecting seats 501 is fixedly connected with the outer end surface of the two sealing belt pressing plates 802 respectively, the other end of the two connecting seats 501 is connected with one end of the two hangers 502 respectively, the other end of the two hangers 502 is fixedly connected with the powder spreading assembly 6 respectively, and the movement of the sealing belt pressing plate 802 drives the movement of the hoisting mechanism 5 to realize the movement of the powder spreading assembly 6.

[0038] Referring to Figure 4 and Figure 5 Preferably, the powder laying assembly 6 further comprises a powder tank seat 602 and a reversing mechanism 603, the powder tank seat 602 is arranged on the powder leakage plate 601, the powder tank seat 602 is slidingly connected with the powder leakage plate 601 through the reversing mechanism 603, the powder tank seat 602 is provided with a first powder tank opening 60201 and a second powder tank opening 60202, the powder leakage plate 601 is provided with a first leakage hole assembly 60101 and a second leakage hole assembly 60102, when the powder laying assembly 6 moves to the first direction, the first leakage hole assembly 60101 is aligned with the first powder tank opening 60201 and the second leakage hole assembly 60102 is not aligned with the second powder tank opening 60202, so as to realize powder laying by the first leakage hole assembly 60101, when the powder laying assembly 6 moves to the limit position of the first direction, the reverser 9 at the limit position of the first direction drives the reversing mechanism 603 to slide to the second direction, so as to align the second leakage hole assembly 60102 with the second powder tank opening 60202 and misalign the first leakage hole assembly 60101 with the first powder tank opening 60201.

[0039] When the powder laying assembly 6 moves to the first direction, the first leakage hole assembly 60101 is aligned with the first powder tank opening 60201 and the second leakage hole assembly 60102 is not aligned with the second powder tank opening 60202, so as to realize powder laying. When the powder laying assembly 6 reaches the limit position of the first direction, the reverser 9 at the limit position of the first direction triggers the reversing mechanism 603 to slide to the second direction. At this time, the second leakage hole assembly 60102 is aligned with the second powder tank opening 60202 and the first leakage hole assembly 60101 is misaligned with the first powder tank opening 60201, so as to switch to powder laying by the second leakage hole assembly 60102. Meanwhile, the device makes the following preparations: first, the forming cylinder is adjusted according to the working height of the scraper 60103; second, the synchronous shaft 3 drives the powder laying assembly 6 to move to the second direction. With the movement of the powder laying assembly 6 to the second direction, the second leakage hole assembly 60102 starts to lay powder, and the scraper 60103 performs flattening treatment on the metal powder. When the powder laying assembly 6 reaches the limit position of the second direction, the reverser 9 at the limit position of the second direction triggers the reversing mechanism 603 to slide to the first direction. At this time, the first leakage hole assembly 60101 is re-aligned with the first powder tank opening 60201, so as to switch back to powder laying by the first leakage hole assembly 60101. The device realizes the effect of single scraper and bidirectional powder laying through the following periodic actions: 1, the powder leakage plate 601 lays powder and the scraper 60103 flattens the metal powder during movement, 2, when the powder laying assembly 6 moves to the limit position, the reversing mechanism 603 drives the first leakage hole assembly 60101 and the second leakage hole assembly 60102 to switch work, 3, the device drives the reversing work to drive the powder laying assembly 6 to move reversely and adjusts the height of the forming rod.

[0040] Referring to Figure 4, preferably, the reversing mechanism 603 comprises two slide rails 60301 and two slide platforms 60302, the two slide rails 60301 are arranged at the bottom of the two ends of the powder tank seat 602 and are parallel to the movement direction, the slide rails 60301 are provided with cavities, the cavities extend to the bottom of the powder tank seat 602, one end of the two slide platforms 60302 is arranged on the two slide rails 60301 respectively, and the two slide platforms 60302 are fixedly connected with the two ends of the powder leakage plate 601 through the two cavities respectively.

[0041] When the powder laying assembly 6 moves to the limit position, the force of the reversing device 9 at the limit position acts on the two ends of the driving powder leakage plate 601, and the slide platform 60302 slides in the slide rail 60301 to drive the powder leakage plate 601 to move, which reduces the friction when the powder leakage plate 601 moves and improves the operation efficiency.

[0042] Referring to Figure 3 , preferably, the reversing mechanism 603 further comprises two sets of buckles 60303, and the two sets of buckles 60303 are arranged on the two end faces of the powder tank seat 602 in the movement direction and are used for clamping the edges of the powder leakage plate 601.

[0043] When the powder laying assembly 6 moves to the limit position, the reversing device 9 at the limit position drives the powder leakage plate 601 to move in the opposite direction, and the buckles 60303 limit the movement of the powder leakage plate 601; ensure that the relative positions of the working hole assembly and the corresponding slot are aligned (when the powder leakage plate 601 moves to the limit position in the first direction, the second hole assembly 60102 is aligned with the second powder slot 60202; when the powder leakage plate 601 moves to the limit position in the second direction, the first hole assembly 60101 is aligned with the first powder slot 60201), and ensure the mechanical reference of the powder laying.

[0044] Preferably, the scraper 60103 is located at the center position between the two hole assemblies, the distance between the two hole assemblies is less than the distance between the two powder slots, and the length of the slide rail 60301 is greater than or equal to half the difference between the distance of the two hole assemblies and the distance of the two powder slots.

[0045] Whether the powder laying assembly 6 moves in the first direction or the second direction, the scraper 60103 is ensured to be located behind the working hole assembly, so that the powder laying and scraping are realized in sequence. The distance between the two hole assemblies is less than the distance between the two powder slots, so that only one hole assembly works. The length of the slide rail 60301 is not less than half the difference between the distance of the two hole assemblies and the distance of the two powder slots, so that the powder leakage plate 601 has a relative sliding displacement to realize the switching work of the first hole assembly 60101 and the second hole assembly 60102.

[0046] Embodiment two

[0047] The embodiment provides a SLM metal 3D printing equipment, comprising a powder laying device of the SLM metal 3D printing equipment in the first embodiment. The powder laying device is provided with a mounting plate 1, a synchronous shaft 3, a plurality of columns 7, and the errors of the mounting plate 1 and the columns 7 are controlled; and the working reference of the powder laying assembly 6 is ensured. When the driving assembly 2 starts to work, the servo motor 201 drives the speed reducer 202, the speed reducer 202 drives the coupling 203, and the coupling 203 drives the synchronous shaft 3; the two linear modules 4 are driven by the two ends of the synchronous shaft 3, so that the movement speed and direction of the linear modules 4 have the same reference. The movement of the two linear modules 4 drives the movement of the two sliders 401; the movement of the two sliders 401 respectively drives the movement of the two protective belt assemblies 8 to form a ring structure: the linear modules 4 avoid direct contact with the powder laying assembly 6, the deposition of metal powder in the linear modules 4 is reduced, the reference working state of the linear modules 4 is ensured, and the movement of the powder laying assembly 6 is realized by driving the lifting mechanism 5 to move through the two sealing belt pressure plates 802. In the process of the movement of the powder laying assembly 6 in the first direction, the first hole assembly 60101 is aligned with the first powder slot 60201, and the second hole assembly 60102 is not aligned with the second powder slot 60202, so that the first hole assembly 60101 lays powder, and the scraper 60103 is used for flattening treatment after the powder laying is completed. When the powder laying assembly 6 moves to the limit position in the first direction, the commutator 9 at the limit position interacts with the powder leakage plate 601 in the movement, the powder leakage plate 601 obtains the force in the second direction; the force on the two ends of the powder leakage plate 601 drives the slide 60302 to move in the second direction on the slide rail 60301, the first hole assembly 60101 is not aligned with the first powder slot 60201, and the second hole assembly 60102 is aligned with the second powder slot 60202, so that the second hole assembly 60102 lays powder, and the driving assembly 2 is driven to move in the opposite direction, so that the two linear modules 4 move in the second direction, and the matched forming cylinder adjusts the height to adapt to the working height of the scraper 60103. After the preparation is completed, the powder laying assembly 6 moves in the second direction and the second hole assembly 60102 lays powder and the scraper 60103 flattens the metal powder; when the powder laying assembly 6 moves to the limit position in the second direction, the commutator at the limit position in the second direction drives the first hole assembly 60101 to lay powder, the synchronous shaft 3 reverses the movement, and the powder laying assembly 6 is prepared to move in the first direction.

[0048] In the description of the present application, it should be noted that the terms "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0049] It should also be noted that unless otherwise explicitly specified and limited, the terms "provided", "connected" should be broadly understood, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific implementation of the above-described system and device can refer to the corresponding process in the foregoing method embodiment.

[0051] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described embodiments. Even if various changes are made to the present application, if these changes fall within the scope of the claims of the present application and its equivalent technology, they still fall within the protection scope of the present application.

Claims

1. A powder spreading device of an SLM metal 3D printing apparatus, characterized in that, The utility model relates to a kind of powder laying device, including: Workbench plane, the flatness error of the workbench plane is ±0.01mm; Two mutually parallel installation plates, two the installation plate is located on the workbench plane, the flatness error of the installation plate is ±0.01mm; Driving assembly, including servo motor, speed reducer and shaft coupling;The driving assembly is fixed on the installation plate, the servo motor is connected with the speed reducer, and the power output end of the speed reducer is connected with the shaft coupling; Synchronous shaft, with the shaft coupling transmission connection; Two groups of linear modules are respectively arranged on two installation plates, and two groups of linear modules are respectively connected with the synchronous shaft; Hoisting mechanism is fixedly connected with the movement end of two groups of linear modules; Powder laying assembly, including powder leakage plate, the powder laying assembly is fixedly connected with the hoisting mechanism, the powder leakage plate is located at the bottom of the powder laying assembly, the powder leakage plate includes doctor blade, the doctor blade is located at the bottom of the powder leakage plate, after the powder laying assembly is laid in the movement direction of the powder laying assembly, the doctor blade is flattened to the metal powder; At least two reversers are respectively arranged at two ends of the movement direction of the powder laying assembly, when the powder laying assembly moves to any one end, the reverser at the end drives the powder leakage plate to lay metal powder reversely.

2. The powder spreading device of an SLM metal 3D printing apparatus according to claim 1, characterized in that, Further including several columns, the bottom of two installation plates is respectively fixed with not less than two columns, the other end of the column is fixed on the workbench plane, and the height error of the column is ±0.02mm.

3. The powder spreading device of the SLM metal 3D printing apparatus according to claim 1, characterized in that, Further including two groups of protective belt assemblies, each group of protective belt assemblies includes two fixed seats, four rotating shafts, sealing belts and sealing belt pressing plates, two fixed seats are arranged at two ends of the installation plate, four rotating shafts are respectively arranged at two ends of two fixed seats and are rotatably connected with the fixed seats, and the annular structure formed by the connection of the sealing belt and the sealing belt pressing plate surrounds four rotating shafts.

4. The powder spreading device of an SLM metal 3D printing apparatus according to claim 3, characterized in that, The linear module includes a sliding block, the sliding block is arranged at the driving end of the linear module, the sliding block is fixedly connected with the inner end surface of the sealing belt pressing plate, the outer end surface of the sealing belt pressing plate is fixedly connected with the hoisting mechanism, and the sliding block drives the annular structure formed by the connection of the sealing belt and the sealing belt pressing plate to move annularly when the linear module moves, and the sealing belt pressing plate drives the hoisting mechanism to move.

5. The powder spreading device of an SLM metal 3D printing apparatus according to claim 4, characterized in that, The hoisting mechanism includes two connecting seats and two hangers, one end of two connecting seats is respectively fixedly connected with the outer end surface of two sealing belt pressing plates, the other end of two connecting seats is respectively connected with one end of two hangers, the other end of two hangers is respectively fixedly connected with the powder laying assembly, and the sealing belt pressing plate drives the hoisting mechanism to move to realize the movement of the powder laying assembly.

6. The powder spreading device of the SLM metal 3D printing apparatus according to claim 1, characterized in that, The powder laying assembly further comprises a powder tank base and a reversing mechanism, the powder tank base is arranged on the powder leakage plate, the powder tank base and the powder leakage plate are slidingly connected through the reversing mechanism, the powder tank base is provided with a first powder tank opening and a second powder tank opening, the powder leakage plate is provided with a first leakage hole assembly and a second leakage hole assembly, when the powder laying assembly moves to a first direction, the first leakage hole assembly is aligned with the first powder tank opening, the second leakage hole assembly is not aligned with the second powder tank opening, and the first leakage hole assembly lays powder, when the powder laying assembly moves to an extreme position of the first direction, the reversing mechanism is driven by the reversing device at the extreme position to slide to a second direction, so that the second leakage hole assembly is aligned with the second powder tank opening, and the first leakage hole assembly is not aligned with the first powder tank opening.

7. The powder spreading device of an SLM metal 3D printing apparatus according to claim 6, characterized in that, The reversing mechanism comprises two sliding rails and two sliding platforms, the two sliding rails are arranged at the bottom of both ends of the powder tank base and are parallel to the moving direction, the sliding rails are provided with cavities, the cavities extend to the bottom of the powder tank base, one end of the two sliding platforms is arranged on the two sliding rails respectively, and the two sliding platforms are fixedly connected with both ends of the powder leakage plate through the two cavities respectively.

8. The powder spreading device of the SLM metal 3D printing apparatus according to claim 6, characterized in that, The reversing mechanism further comprises two groups of buckles, the two groups of buckles are arranged on the two end faces of the powder tank base in the moving direction respectively, and are used for clamping the edges of the powder leakage plate.

9. The powder spreading device of the SLM metal 3D printing apparatus according to claim 7, characterized in that, The scraper is located at the central position between the two leakage hole assemblies, the distance between the two leakage hole assemblies is smaller than the distance between the two powder tank openings, and the length of the sliding rail is greater than or equal to half of the difference between the distance of the two leakage hole assemblies and the distance of the two powder tank openings.

10. An SLM metal 3D printing apparatus, characterized by The powder laying device of the SLM metal 3D printing equipment according to any one of claims 1-9.

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