Coating device of 3D printing equipment

Abstract

The invention discloses a coating device of 3D printing equipment, and relates to the technical field of 3D printing equipment, the coating device comprises a moving box horizontally connected in a machine shell in a sliding mode, and further comprises a rotating shaft, a linkage assembly, a driving assembly and two push-type broaches, and the two push-type broaches are vertically connected to the moving box in a sliding mode; the two push-type broaches are provided with a storage station contracted into the moving box and a material pushing station extending to the outer portion of the moving box in the sliding stroke relative to the moving box, and a material spraying assembly in the machine shell is installed at the bottom of the moving box and located between the two push-type broaches. Wherein one push-type broach and the material spraying assembly work together to conduct blanking and flattening at the same time, and the two push-type broaches on the other side conduct replacement of the storage station and the material pushing station, so that in the next layer of powder laying work, the other push-type broach and the material spraying assembly can conduct blanking and flattening work synchronously; in this way, feeding work and spreading work can be conducted synchronously, and the working efficiency can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing equipment, and particularly to a coating device for a 3D printing equipment. Background Art

[0002] A 3D printing equipment, also known as an additive manufacturing equipment, is a device that manufactures three-dimensional objects by stacking materials layer by layer based on a digital model. Its functions are reflected in rapid prototyping manufacturing, customized production, complex structure manufacturing, etc. And the powder spreading type 3D printing equipment belongs to one type of 3D printing equipment.

[0003] For example, the patent with the publication number CN215615106U discloses a metal powder spreading 3D printing equipment with the name of "A Metal Powder Spreading 3D Printing Equipment", which includes a main body structure, a printing mechanism, a processing mechanism, a moving mechanism and a recycling mechanism. The lower surface of the bottom plate is connected to the lower surface inside the housing. The load-bearing platform is provided with a first through hole, the protective shell is provided with a second through hole, the workbench is provided with a third through hole, and one end of the powder storage box sequentially passes through the first through hole, the second through hole and the third through hole and is slidably matched with the powder pushing plate.

[0004] For the prior art such as the above patent, it can move the powder storage box and then move the scraper so that the scraper can drive the metal powder to be evenly spread on the processing table and then carry out processing. Firstly, the scraper needs to return to the initial position to be able to carry out the next material scraping, making the operation rather cumbersome. Secondly, the feeding and scraping are carried out step by step, which will affect the working efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a coating device for a 3D printing equipment to solve the deficiencies in the above prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A coating device for a 3D printing equipment includes a moving box slidably connected horizontally inside a machine shell, and further includes: two pushing knives vertically slidably connected to the moving box. During the sliding strokes of the two pushing knives relative to the moving box, each has a receiving position where it retracts into the moving box and a feeding position where it extends outside the moving box; a rotating shaft rotatably connected inside the moving box, on which a bidirectional telescopic rod is fixedly connected, and the two ends of the bidirectional telescopic rod are respectively hinged to the two pushing knives; a linkage assembly arranged between the moving box and the machine shell. During the sliding stroke of the moving box relative to the machine shell, there are two extreme positions. When the moving box slides from one extreme position to the other extreme position, the two pushing knives are respectively alternated between the receiving position and the feeding position through the linkage assembly; a driving assembly for driving the moving box to slide horizontally.

[0007] Further, the linkage assembly includes: a half gear coaxially and fixedly connected to the rotating shaft; a sliding frame vertically slidably connected to the moving box, on which a first tooth group and a second tooth group are provided; and two first wedge blocks respectively fixedly connected to the inner walls on both sides of the housing.

[0008] Further, it further includes two locking assemblies, and each locking assembly includes: a first fixing block fixedly connected to the sliding frame, on which a clamping groove is formed, and a first through groove communicating with the clamping groove is further formed on the first fixing block; a second fixing block fixedly connected to the moving box, on which a second through groove is formed; a second wedge block horizontally slidably connected to the second fixing block; an elastic member disposed between the second wedge block and the second fixing block; and a connecting rod fixedly connected to the corresponding first wedge block.

[0009] Further, the bidirectional telescopic rod includes a sleeve rod and two inner rods, the middle of the sleeve rod is rotatably connected to the rotating shaft, and both inner rods are slidably connected to the sleeve rod.

[0010] Further, the elastic member includes a spring, one end of the spring is connected to the second wedge block, and the other end of the spring is connected to the second fixing block.

[0011] Further, two rotating rods are rotatably connected to the sliding frame.

[0012] Further, the driving assembly includes: a reciprocating lead screw rotatably connected in the housing; a guide rod fixedly connected in the housing, on which a bearing block is slidably connected, and the bearing block is in threaded fit with the reciprocating lead screw; and a driving motor for driving the reciprocating lead screw to rotate.

[0013] Compared with the prior art, for the coating device of a 3D printing device provided by the present invention, the spraying component in the housing is installed at the bottom of the moving box and between two pushing blades. During the spreading process, one of the pushing blades and the spraying component work together to feed and level the material at the same time. When it comes to the other side, both pushing blades perform the replacement between the receiving station and the pushing station, so that in the next layer of powder spreading work, the other pushing blade and the spraying component can also synchronously perform the work of feeding and leveling the material. In this way, the feeding work and the spreading work can be carried out synchronously, which can greatly improve the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0015] Figure 1 It is a schematic diagram of the external structure of the device provided by the embodiment of the present invention;

[0016] Figure 2 Schematic structural diagram of the linkage component provided by the embodiment of the present invention;

[0017] Figure 3 Provided by the embodiment of the present invention Figure 2 Enlarged structural diagram at position A in

[0018] Figure 4 Schematic structural diagram of the upper part of the moving box provided by the embodiment of the present invention;

[0019] Figure 5 Provided by the embodiment of the present invention Figure 4 Enlarged structural diagram at position B in

[0020] Figure 6 Schematic internal structure diagram of the moving box provided by the embodiment of the present invention;

[0021] Figure 7 Schematic internal structure diagram of the second fixing block provided by the embodiment of the present invention.

[0022] Explanation of reference numerals:

[0023] 1. Housing; 2. Moving box; 21. Pushing knife; 22. Rotating shaft; 3. Bi-directional telescopic rod; 31. Sleeve rod; 32. Inner rod; 4. Linkage component; 41. Half gear; 42. Sliding frame; 421. First tooth group; 422. Second tooth group; 423. Rotating rod; 43. First wedge block; 431. Connecting rod; 5. Driving component; 51. Reciprocating lead screw; 52. Guide rod; 53. Bearing block; 6. First fixing block; 61. Card slot; 62. First through groove; 7. Second fixing block; 71. Second through groove; 72. Second wedge block; 73. Elastic member. Detailed implementation manners

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Please refer to Figure 1-7, a coating device of a 3D printing device provided by an embodiment of the present invention includes a moving box 2 horizontally and slidably connected in a machine housing 1, and further includes a rotating shaft 22, a linkage assembly 4, a driving assembly 5, and two pushing blades 21. The two pushing blades 21 are vertically and slidably connected to the moving box 2. During the sliding stroke of the two pushing blades 21 relative to the moving box 2, each has a storage position retracted into the moving box 2 and a material pushing position extending outside the moving box 2. The rotating shaft 22 is rotatably connected in the moving box 2, and a bidirectional telescopic rod 3 is fixedly connected to the rotating shaft 22. The two ends of the bidirectional telescopic rod 3 are respectively hinged to the two pushing blades 21. The linkage assembly 4 is arranged between the moving box 2 and the machine housing 1. During the sliding stroke of the moving box 2 relative to the machine housing 1, there are two extreme positions. When the moving box 2 slides from one extreme position to the other extreme position, the two pushing blades 21 are respectively replaced between the storage position and the material pushing position through the linkage assembly 4. The driving assembly 5 is used to drive the moving box 2 to slide horizontally.

[0026] Specifically, the bidirectional telescopic rod 3 includes a sleeve rod 31 and two inner rods 32. The middle of the sleeve rod 31 is rotatably connected to the rotating shaft 22. The two inner rods 32 are both slidably connected to the sleeve rod 31. The linkage assembly 4 includes a half gear 41, a sliding frame 42, and two first wedge-shaped blocks 43. The half gear 41 is coaxially and fixedly connected to the rotating shaft 22. The sliding frame 42 is vertically and slidably connected to the moving box 2. The sliding frame 42 is provided with a first tooth group 421 and a second tooth group 422. The two first wedge-shaped blocks 43 are respectively fixedly connected to the inner walls of both sides of the machine housing 1. The driving assembly 5 includes a reciprocating lead screw 51, a guide rod 52, and a driving motor (not shown in the figure). The reciprocating lead screw 51 is rotatably connected in the machine housing 1. The guide rod 52 is fixedly connected to the machine housing 1. A bearing block 53 is slidably connected to the guide rod 52. The bearing block 53 is in threaded fit with the reciprocating lead screw. The driving motor is used to drive the reciprocating lead screw 51 to rotate.

[0027] Working principle: Firstly, the driving motor can drive the reciprocating lead screw 51 to rotate. The bearing block 53 is slidably connected to the guide rod 52 and is in threaded fit with the reciprocating lead screw 51. Thus, the rotation of the reciprocating lead screw 51 can drive the bearing block 53 to slide horizontally. The bearing block 53 can slide horizontally back and forth, and then drive the moving box 2 to move synchronously. The blanking assembly (not shown in the figure, which is prior art and will not be elaborated here) is installed on the moving box 2 and is located between the two pushing blades 21. For example, when the pushing blade 21 on the same side of the first tooth group 421 moves to the other side, the blanking assembly discharges materials while the pushing blade 21 can perform the leveling work. When it reaches the discharging position (not shown in the figure), the excess materials will automatically fall to the bottom of the machine housing 1. When the pushing blade 21 on the same side of the first tooth group 421 moves to the other side, the sliding plate will abut against the inclined surface of the first wedge-shaped block 43, causing the sliding plate to slide vertically relative to the moving box 2. During the vertical sliding of the moving box 2, the first tooth group 421 will engage with the half gear 41, causing the half gear 41 to rotate. The rotation of the half gear 41 drives the rotation of the rotating shaft 22, and the rotation of the rotating shaft 22 drives the rotation of the sleeve rod 31 of the double telescopic rod 3. During the rotation of the sleeve rod 31, the two inner rods 32 will experience a process of contraction and then stretching (a spring is provided between the two inner rods 32. First, the spring will be compressed, and then the elastic force of the spring drives the two inner rods 32 to stretch relative to the sleeve rod 31). Since the other ends of the two inner rods 32 away from the sleeve rod 31 are hinged to the two pushing blades 21 respectively, then the pushing blade 21 on the same side as the first tooth group 421 is switched from the material pushing position to the storage position, and the pushing blade 21 on the same side as the second tooth group 422 is switched from the storage position to the material pushing position; then drive the pushing blade 21 on the same side as the second tooth group 422 to move to the other side. During this process, the blanking assembly continues to discharge materials while the pushing blade 21 on the same side as the second tooth group 422 performs the leveling work until the excess powder is discharged to the bottom of the machine housing 1 at another discharging position. Finally, the sliding plate abuts against another first wedge-shaped block 43 again, causing the sliding plate to slide vertically relative to the moving box 2. Then, the second tooth group 422 of the sliding plate cooperates with the half gear 41, causing the half gear 41 to rotate. Thus, the pushing blade 21 on the same side as the first tooth group 421 is switched from the storage position to the material pushing position, and the pushing blade 21 on the same side as the second tooth group 422 is switched from the material pushing position to the storage position. Repeating the above work can perform the next reciprocating material pushing and leveling work.

[0028] During the above working process, the blanking device on the moving box 2 can cooperate with one of the pushing knives 21 while blanking, so that the material discharged onto the workbench can be flattened. The simultaneous progress of these two operations can greatly increase the working speed. Moreover, after the two pushing knives 21 move to their corresponding positions, they can automatically switch workstations, which also greatly facilitates the work of the operator. It is worth mentioning here that the two first wedge blocks 43 are arranged at the diagonals inside the casing 1. Contacting one of the first wedge blocks 43 will cause the sliding plate to slide vertically downward, and contacting the other first wedge block 43 will cause the sliding plate to slide vertically upward. During the vertical upward sliding process of the sliding plate, the first tooth group 421 cooperates with the half gear 41 to cause the rotating shaft 22 to rotate clockwise, and during the vertical downward sliding process of the sliding plate, the second tooth group 422 cooperates with the half gear 41 to cause the rotating shaft 22 to rotate counterclockwise (the first tooth group 421 and the second tooth group 422 are arranged diagonally relative to the sliding plate).

[0029] Compared with the prior art, in the coating device of a 3D printing device provided by the present invention, the spraying component inside the casing 1 is installed at the bottom of the moving box 2 and between the two pushing knives 21. During the material spreading process, one of the pushing knives 21 and the spraying component work together to blank and flatten the material at the same time. When it comes to the other side, both of the two pushing knives 21 alternate between the storage station and the material pushing station, so that in the next layer of powder spreading work, the other pushing knife 21 and the spraying component can also synchronously carry out the blanking and flattening work. In this way, the feeding work and the material spreading work can be carried out synchronously, which can greatly improve the working efficiency.

[0030] Wherein, there are also two locking components. The locking components include a first fixing block 6, a second fixing block 7, a second wedge block 72, an elastic member 73 and a connecting rod 431. The first fixing block 6 is fixedly connected to the sliding frame 42. A clamping groove 61 is formed on the first fixing block 6, and a first through groove 62 communicating with the clamping groove 61 is also formed on the first fixing block 6; the second fixing block 7 is fixedly connected to the moving box 2, and a second through groove 71 is formed on the second fixing block 7; the second wedge block 72 is horizontally slidably connected to the second fixing block 7; the elastic member 73 is arranged between the second wedge block 72 and the second fixing block 7; the connecting rod 431 is fixedly connected to the corresponding first wedge block 43. Specifically, the elastic member 73 includes a spring, one end of the spring is connected to the second wedge block 72, and the other end of the spring is connected to the second fixing block 7.

[0031] Taking any one of the locking components as an example, during the switching process of the two pushing blades 21, the sliding plate slides vertically relative to the moving box 2. During the sliding process of the sliding plate, the sliding plate will abut against the second wedge block 72 on the second fixed block 7, causing the second wedge block 72 to slide horizontally relative to the second fixed block 7. And during this process, the wedge block will squeeze the spring, causing elastic deformation of the spring. Then when the card slot 61 on the first fixed block 6 is aligned with the second wedge block 72, the second wedge block 72 is subjected to the elastic force of the spring, enabling the spring to move horizontally, and then the second wedge block 72 extends into the card slot 61 of the first fixed block 6 (at the same time, the sliding plate ends the abutment with the first wedge block 43). In this way, the sliding plate can be fixed at this position (that is, the pushing blade 21 on the same side as the second tooth group 422 slides to the material pushing station). After that, the driving component 5 is used to drive the bearing block 53 to drive the moving box 2 to move. During the process of the moving box 2 moving horizontally to the other side of the machine case 1, the connecting rod 431 on the first wedge block 43 will be inserted into the through groove. Then, as the moving box 2 moves, the connecting rod 431 abuts against the second wedge block 72, causing the second wedge block 72 to slide horizontally relative to the second fixed block 7. When the second wedge block 72 disengages from the card slot 61 of the first fixed block 6, the sliding plate abuts against the other first wedge block 43, causing the sliding plate to move vertically. During the moving process, the second wedge block 72 disengages from the card slot 61, which means the locking function is released. In addition, during the movement of the sliding plate and the moving box 2, the connecting rod 431 can move out of the first through groove 62 of the first fixed block 6 and the second through groove 71 of the second fixed block 7, thus ending the abutment between the connecting rod 431 and the second wedge block 72. During the abutment between the connecting rod 431 and the second wedge block 72, the second wedge block 72 will squeeze the spring. And when the connecting rod 431 disengages from the abutment with the second wedge block 72, the elastic force of the spring will cause the second wedge block 72 to reset. In this way, the switching work between the receiving station and the material pushing station of the two pushing blades 21 can be carried out again; the working process of the other locking component is the same. During the material pushing process, one of the locking components exerts the locking function. During the reciprocating movement of the moving box 2, the two locking components alternately exert their functions.

[0032] Wherein, two rotating rods 423 are rotatably connected to the sliding frame 42. By the abutment of the rotating rods 423 against the inclined surface of the first wedge block 43, the wear generated during the abutment with the first wedge block 43 is reduced.

[0033] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A coating device for a 3D printing device, comprising a movable box horizontally slidably connected to a housing, characterized in that: Also includes: Two push knives are vertically slidably connected to the moving box, and the two push knives have a storage position retracted into the moving box and a material pushing position extending to the outside of the moving box in the sliding stroke relative to the moving box; A rotating shaft is rotatably connected in the moving box, and a bidirectional telescopic rod is fixedly connected thereto, and two ends of the bidirectional telescopic rod are respectively hinged to two push knives; A linkage assembly is arranged between the moving box and the housing. The moving box has two limit positions in its sliding stroke relative to the housing. When the moving box slides from one limit position to another limit position, the linkage assembly enables the two push knives to respectively switch between the storage position and the material pushing position. The driving assembly is used to drive the moving box to slide horizontally.

2. The coating device of a 3D printing device according to claim 1, characterized in that: The linkage components include: A half gear coaxially fixedly connected to the rotating shaft; A sliding frame is vertically slidably connected to the moving box and is provided with a first tooth group 421 and a second tooth group; Two first wedge-shaped blocks are respectively fixedly connected to the inner walls on both sides of the casing.

3. The coating device of a 3D printing device according to claim 2, characterized in that: Also included are two locking assemblies, the locking assemblies comprising: A first fixed block, which is fixedly connected to the sliding frame and has a card slot formed thereon. The first fixed block also has a first through slot that is in communication with the card slot; A second fixed block is fixedly connected to the moving box and has a second through slot; A second wedge-shaped block horizontally slidably connected to the second fixed block; An elastic member, which is arranged between the second wedge block and the second fixed block; A connecting rod is fixedly connected to the corresponding first wedge block.

4. The coating device of a 3D printing device according to claim 1, characterized in that: The bidirectional telescopic rod comprises a sleeve rod and two inner rods, the middle part of the sleeve rod is rotatably connected to the rotating shaft, and the two inner rods are both slidably connected to the sleeve rod.

5. The coating device of a 3D printing device according to claim 3, characterized in that: The elastic member comprises a spring, one end of the spring is connected to the second wedge block, and the other end of the spring is connected to the second fixing block.

6. The coating device of a 3D printing device according to claim 2, characterized in that: The sliding frame is rotatably connected to two rotating rods.

7. The coating device of a 3D printing device according to claim 1, characterized in that: The drive assembly comprises: a reciprocating screw, which is rotatably connected within the housing; A guide rod, which is fixedly connected in the housing, and on which a bearing block is slidably connected, and the bearing block is threadably connected with the reciprocating screw; A driving motor is used to drive the reciprocating screw to rotate.

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