Dynamic sealing device in additive manufacturing printing chamber and additive manufacturing equipment

Abstract

The utility model provides a dynamic sealing device in an additive manufacturing printing chamber and additive manufacturing equipment, and belongs to the field of additive manufacturing, the dynamic sealing device comprises a side plate, the side plate is arranged in a printing chamber cavity and divides the printing chamber cavity into a working area and an isolation area, and the side plate is provided with a window; the sealing belt is arranged in the isolation area and horizontally and axially rotates, and the sealing belt always shields the window and prevents smoke dust in the working area from entering the isolation area through the window; the sliding piece is arranged on the sealing belt and located in the working area, and the sliding piece moves along the window along with the sealing belt. The sealing belt is a metal net belt with the front face and the back face coated with Teflon coating cloth. According to the sealing belt, the metal net belt with the Teflon coating cloth attached to the front face and the back face is adopted as the sealing belt, the sealing belt can be straightened and can rotate to seal the window in the side plate, the Teflon coating cloth is insulated, smoke dust cannot be attached to the Teflon coating cloth, and the smoke dust is prevented from entering an isolation area along with rotation of the sealing belt to damage parts such as a guide rail.

Description

TECHNICAL FIELD

[0001] The utility model relates to additive manufacturing technical field especially relates to a kind of dynamic sealing device in additive manufacturing printing room and additive manufacturing equipment. BACKGROUND

[0002] The basic process of metal additive manufacturing process is: powder feeding component sends a certain amount of metal powder to the workbench, powder laying mechanism lays a layer of metal powder material on the upper surface of the formed part of the workbench, galvanometer system controls laser to scan and sinter the solid part powder layer according to the section profile of the layer, so that the powder melts and realizes fusion with the lower formed part; after a layer of section is sintered, the sintering plate in the forming cylinder is lowered by one layer thickness, the powder laying mechanism lays a layer of uniform and dense metal powder on it, and a new layer of section scanning and sintering is carried out, and after a certain number of layers of scanning and superposition, the whole part manufacturing is completed. Most of the existing equipment only uses gantry type powder laying structure, that is, one set of linear guide rail and slider assembly is distributed at the air outlet, and the other set of linear guide rail and slider assembly is distributed at the air inlet, and both sets of linear guide rail and slider assembly in the powder laying structure are not effectively protected. The linear guide rail and slider distributed at the air inlet are easily polluted by smoke and dust and damaged, which greatly reduces the service life of the slider and increases the maintenance cost of the metal additive manufacturing equipment.

[0003] Chinese patent CN208680532U discloses a dustproof mechanism of additive manufacturing equipment, which sets the slider on the sealable rotating sealing belt, covers the square hole of the side plate with the sealing belt, and makes the scraper assembly fixed on the driving assembly do powder laying motion in the laser processing bin, so as to block the dust with the sealing belt. However, the sealing belt adopts steel belt, which generates static electricity during movement, not only adsorbs the black smoke and dust generated in the sintering process on the steel belt, but also cannot avoid the risk of dust explosion caused by static electricity. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a kind of dynamic sealing device in additive manufacturing printing room and additive manufacturing equipment, to solve the problem that black smoke and dust generated in the sintering process are adsorbed on the steel belt, and it is difficult to avoid the risk of dust explosion caused by static electricity.

[0005] The utility model discloses a kind of dynamic sealing devices in additive manufacturing printing room, including printing room cavity;Side plate, be set in printing room cavity and separate printing room cavity into work area and isolation area, window is opened in side plate, and window is communicated between work area and isolation area;Sealing tape, set in isolation area and horizontal axial rotation, sealing tape always obstructs window and hinders that smoke and dust in work area enters isolation area through window;Sliding member, set sealing tape and be located in work area, sliding member moves along window with sealing tape;Wherein, sealing tape is the metal mesh belt that the both sides of positive and negative are pasted with Teflon coating cloth.

[0006] On the basis of above technical scheme, preferably, the edge of sealing tape is pasted on the inner wall surface of window towards isolation area;Side plate is metal plate, and side plate is set to ground.

[0007] On the basis of above technical scheme, preferably, metal mesh belt is steel wire mesh belt.

[0008] On the basis of above technical scheme, preferably, the wire diameter of metal mesh belt is 0.5-1mm, and the mesh hole diameter of metal mesh belt is 0.5-1mm.

[0009] On the basis of above technical scheme, preferably, the length and width of sealing tape along its extension direction are greater than the length and width of window along its extension direction.

[0010] On the basis of above technical scheme, preferably, it further includes fixed wheel and tension pulley;Fixed wheel and tension pulley are all set in isolation area, and fixed wheel and tension pulley are respectively set in both ends of window extension direction;Sealing tape is ring belt, and sealing tape is straightened and the both ends of its straightening are respectively sleeved in fixed wheel and tension pulley;Fixed wheel rotates with the movement of sealing tape, and tension pulley drives sealing tape to be tensioned and straightened.

[0011] More preferably, fixed wheel and tension pulley all include, wheel shaft, which is vertically set and rotates in the axial direction;Bearing, which is sleeved on wheel shaft and rotates synchronously with wheel shaft;Wheel body, which is installed on wheel shaft through bearing and rotates under the drive of wheel shaft, and the inside of end of sealing tape is sleeved in wheel body;Dust cover, which is set in both ends of wheel shaft and shields bearing.

[0012] On the basis of above technical scheme, preferably, it further includes guide rail, which is set in isolation area and both ends along window extend;Powder laying mechanism, which is set in work area and is used for powder laying;Wherein, sliding member is simultaneously set on guide rail and sealing tape, and sliding member is connected on one end of powder laying mechanism and drives powder laying mechanism to move.

[0013] On the basis of above technical scheme, preferably, window is opened in the position of the bottom of side plate close to work area, and dust suction port is used for sucking away smoke and dust in work area.

[0014] In another aspect, the utility model provides a kind of additive manufacturing equipment, adopts the dynamic sealing device in the printing chamber of above-mentioned additive manufacturing.

[0015] The dynamic sealing device in the printing chamber of the additive manufacturing of the utility model has the following beneficial effects relative to the prior art:

[0016] (1) the sealing tape of the utility model adopts the metal mesh belt of Teflon coating cloth pasting on two sides as sealing tape, so that the sealing tape can be straightened and rotated to close the window on the side plate, Teflon coating cloth is insulated and will not adhere to soot, to avoid soot entering the isolation area with the rotation of sealing tape and causing damage to guide rail and other components.

[0017] (2) the side plate of the utility model adopts metal plate, and the metal plate is grounded, which ensures that the sealing strip is in close contact with the side plate to improve the sealing effect, and at the same time, the static electricity generated by the friction between the sealing strip and the side plate is discharged, thereby avoiding the risk of dust explosion of smoke dust in the working area caused by static electricity. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Figure 1 It is a perspective view of the additive manufacturing equipment of the utility model;

[0020] Figure 2 It is a perspective view of the dynamic sealing device of the utility model;

[0021] Figure 3 It is a sectional view of the sealing tape of the utility model;

[0022] Figure 4 It is a partial perspective view of the dynamic sealing device of the utility model;

[0023] Figure 5 It is a side sectional view of the fixed wheel of the utility model;

[0024] Figure 6 It is a side sectional view of the tensioning wheel of the utility model.

[0025] In the figure: 1, printing chamber cavity; 101, work area; 102, isolation area; 103, dust suction port; 2, side plate; 201, window; 3, sealing tape; 31, metal mesh belt; 32, Teflon coated cloth; 4, sliding piece; 5, fixed wheel; 51, wheel shaft; 52, bearing; 53, wheel body; 54, dust cover; 6, tensioning wheel; 7, guide rail; 8, powder laying mechanism. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] As shown in the figure, in combination with the present application and the prior art, the dynamic sealing device in the additive manufacturing printing chamber of the present application comprises a printing chamber cavity 1, a side plate 2, a sealing tape 3 and a sliding piece 4. Figure 1 Figure 2 Figure 3

[0028] Among them, the printing chamber cavity 1 is the core structure of the additive manufacturing equipment, the side plate 2 is arranged in the printing chamber cavity 1 and divides the printing chamber cavity 1 into a work area 101 and an isolation area 102, the work area 101 is the area actually printing in the additive manufacturing process, and the isolation area 102 is used for isolation from the external environment, usually the precise components such as guide rails 7 are arranged in the isolation area 102 to be separated from the work area 101, so as to avoid the damage of the smoke and dust generated by the sintering printing in the work area to the components such as guide rails 7.

[0029] The side plate 2 is provided with a window 201, and the window 201 is communicated between the work area 101 and the isolation area 102. Since the function of the guide rail 7 is to drive the powder laying scraper component in the work area 101 to move, the guide rail 7 will be arranged on the left and right sides, so the side plate 2 is also arranged on the left and right sides.

[0030] ​​​The sealing belt 3 plays a role of dynamic sealing, is arranged in the isolation area 102 and rotates horizontally and axially, and the sealing belt 3 always shields the window 201 during rotation, which prevents the smoke and dust in the working area 101 from entering the isolation area 102 through the window 201. The current sealing belt 3 is usually a metal belt or a plastic belt, but the metal belt will rub against the contact part of the side plate during rotation, thereby generating static electricity, which not only causes the smoke and dust to be adsorbed on the metal sealing belt 3, but also causes the static electricity to trigger dust explosion. The plastic belt is easy to wear during rubbing, thereby generating static electricity and other impurity powder due to wear, which affects sintering printing. In the embodiment, the sealing belt 3 is a metal mesh belt 31 with Teflon coating cloth 32 on both sides, the metal mesh belt 31 is the main structure of the sealing belt 3, has good strength and good bending ductility, so that the sealing belt 3 can rotate effectively and will not be accidentally damaged and broken. The Teflon coating cloth 32 on both sides of the metal mesh belt 31 has insulation performance, so that static electricity is avoided when the sealing belt 3 rotates and rubs against the side plate 2. The Teflon coating cloth 32 has low adhesion, so that the smoke and dust is greatly reduced to be adsorbed on the surface of the sealing belt 3, and the problem that the smoke and dust enters the isolation area 102 with the sealing belt 3 to cause pollution is avoided.

[0031] The sliding member 4 is installed at the side end of the powder laying mechanism 8, so that the powder laying mechanism 8 is installed on the guide rail 7 through the sliding member 4. The sliding member 4 is arranged on the sealing belt 3 and located in the working area 101, and moves along the window 201 with the sealing belt 3. At present, the equipment on the market adopts the scheme that the sealing belt 3 is stationary and the sliding member 4 moves on the sealing belt 3. Since the contact part of the sliding member 4 and the sealing belt 3 in the scheme is the surface of the sealing belt 3 facing the working area 101, it is difficult to avoid the smoke and dust entering the contact part between the sliding member 4 and the sealing belt 3, thereby causing the sliding member 4 to be stuck. In the embodiment, the sliding member 4 moves synchronously with the sealing belt 3. Since the part for driving the sealing belt 3 to rotate is arranged in the isolation area 102, the sliding member 4 will not be stuck, and the sealing belt 3 will not be stuck, so that the sealing effect of the sealing belt 3 is ensured.

[0032] In Figure 2 In a preferred embodiment shown in the figure, the edge of the sealing belt 3 is attached to the inner wall surface of the window 201 facing the isolation area 102, so that the tightness of the sealing effect is ensured. Since the working temperature during sintering printing is very high, the environmental temperature in the working area 101 is very high, so the side plate 2 is usually made of metal. The sealing belt 3 rubs against the side plate 2 when in contact, thereby generating static electricity. The side plate 2 is grounded, so that the static electricity on the side plate 2 is discharged.

[0033] In Figure 3 In a preferred embodiment shown in the figure, the metal mesh belt 31 is a steel mesh belt, which has high strength and low cost.

[0034] In Figure 3 In a preferred embodiment shown in the drawings, the wire diameter of the metal mesh belt 31 is 0.5-1 mm, and the mesh hole diameter of the metal mesh belt 31 is 0.5-1 mm. The thinner the wire diameter of the metal mesh belt 31, the better the flexibility of the metal mesh belt 31, but the strength will also decrease; the smaller and denser the mesh hole diameter of the metal mesh belt 31, the better the sealing effect, but the difficulty of manufacturing will also increase. The metal mesh belt 31 does not show mesh holes after being covered with the Teflon coating cloth 32; if the mesh holes are too large, obvious mesh holes will still be produced after being covered with the Teflon coating cloth 32.

[0035] In Figure 2 In a preferred embodiment shown in the drawings, the length and width of the sealing belt 3 along its extension direction are greater than the length and width of the window 201 along its extension direction, so that the edges of the sealing belt 3 can be tightly attached to the inner wall of the window 201 to ensure the sealing effect.

[0036] In Figure 4 In a preferred embodiment shown in the drawings, the sealing belt 3 is a ring belt, and a closed loop is formed by the fixed wheel 5 and the tensioning wheel 6, so that the sealing belt 3 can move stably and be straightened, and the two ends of the straightened sealing belt 3 are respectively sleeved on the fixed wheel 5 and the tensioning wheel 6; the fixed wheel 5 rotates with the movement of the belt surface of the sealing belt 3, and the tensioning wheel 6 drives the sealing belt 3 to be tensioned and straightened. Through this structure, the sealing belt 3 can stably shield the window 201 during work, and the service life and effect of the sealing belt 3 are guaranteed due to regular tensioning and regular adjustment.

[0037] In In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54.

[0038] Figure 5 In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54. Figure 6 In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54.

[0039] In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54.

[0040] In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54.

[0041] In a preferred embodiment shown in the drawings, the fixed wheel 5 and the tensioning wheel 6 each include a wheel shaft 51, a bearing 52, a wheel body 53, and a dust cover 54.

[0042] Dustproof covers 54 are arranged at both ends of the wheel shaft 51 and cover the bearings 52.

[0043] In Figure 2 A preferred embodiment is shown in the drawings, which further comprises a guide rail 7 and a powder laying mechanism 8.

[0044] The guide rail 7 is arranged in the isolation area 102 and extends along the window 201 at both ends.

[0045] The powder laying mechanism 8 is arranged in the working area 101 and is used for laying powder.

[0046] The sliding member 4 is arranged on both the guide rail 7 and the sealing belt 3, and is connected to one end of the powder laying mechanism 8 and drives the powder laying mechanism 8 to move.

[0047] In Figure 2 In a preferred embodiment, dust suction ports 103 are arranged at the bottom of the side plates 2 and close to the working area 101, and the dust suction ports 103 suck away the smoke and dust in the working area 101.

[0048] In Figure 1 A preferred embodiment is shown in the drawings, which further comprises a guide rail 7 and a powder laying mechanism 8.

[0049] The above description is only a preferred embodiment of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A dynamic sealing device for an additive manufacturing printing chamber, characterized in that, include: Printing chamber (1); A side plate (2) is disposed inside the printing chamber cavity (1) and divides the printing chamber cavity (1) into a working area (101) and an isolation area (102). A window (201) is provided on the side plate (2) and the window (201) connects the working area (101) and the isolation area (102). A sealing strip (3) is set in the isolation zone (102) and rotates horizontally. The sealing strip (3) always blocks the window (201) and prevents the smoke and dust in the work area (101) from entering the isolation zone (102) through the window (201). A sliding member (4) is provided on the sealing strip (3) and located in the working area (101). The sliding member (4) moves along the window (201) with the sealing strip (3). The sealing strip (3) is a metal mesh strip (31) with Teflon-coated cloth (32) pasted on both sides.

2. The dynamic sealing device in an additive manufacturing printing chamber according to claim 1, characterized in that: The edge of the sealing strip (3) is attached to the inner wall surface of the window (201) facing the isolation area (102); The side plate (2) is a metal plate and is grounded.

3. The dynamic sealing device in an additive manufacturing printing chamber according to claim 1, characterized in that: The metal mesh belt (31) is a steel wire mesh belt.

4. The dynamic sealing device in an additive manufacturing printing chamber according to claim 1, characterized in that: The wire diameter of the metal mesh belt (31) is 0.5-1mm, and the mesh size of the metal mesh belt (31) is 0.5-1mm.

5. The dynamic sealing device in an additive manufacturing printing chamber according to claim 1, characterized in that: The length and width of the sealing strip (3) along its extension direction are greater than the length and width of the window (201) along its extension direction.

6. The dynamic sealing device in an additive manufacturing printing chamber according to claim 1, characterized in that: It also includes a fixed wheel (5) and a tensioning wheel (6); The fixed wheel (5) and the tensioning wheel (6) are both located in the isolation area (102), and the fixed wheel (5) and the tensioning wheel (6) are respectively located at both ends of the extension direction of the window (201); The sealing strip (3) is a ring strip, and the sealing strip (3) is straightened and its straightened ends are respectively sleeved on the fixed wheel (5) and the tensioning wheel (6); The fixed wheel (5) moves and rotates with the sealing strip (3), and the tensioning wheel (6) drives the sealing strip (3) to be tensioned and straightened.

7. A dynamic sealing device for an additive manufacturing printing chamber according to claim 6, characterized in that: Both the fixed wheel (5) and the tensioning wheel (6) include, A wheel axle (51) is axially perpendicular and axially rotates; The bearing (52) is sleeved on the axle (51) and rotates synchronously with the axle (51); The wheel body (53) is mounted on the axle (51) via the bearing (52) and rotates under the drive of the axle (51). The wheel body (53) is sleeved on the inner side of the end of the sealing strip (3). Dust covers (54) are provided at both ends of the axle (51) and cover the bearings (52).

8. A dynamic sealing device for an additive manufacturing printing chamber according to claim 1, characterized in that, Also includes: A guide rail (7) is provided within the isolation zone (102) and extends at both ends along the window (201); A powder spreading mechanism (8) is provided in the working area (101) and is used for spreading powder; The sliding member (4) is simultaneously mounted on the guide rail (7) and the sealing strip (3). The sliding member (4) is connected to one end of the powder spreading mechanism (8) and drives the powder spreading mechanism (8) to move.

9. A dynamic sealing device for an additive manufacturing printing chamber according to claim 1, characterized in that: The bottom of the side plate (2) is provided with a dust suction port (103) close to the working area (101), and the dust suction port (103) sucks away the smoke and dust in the working area (101).

10. An additive manufacturing apparatus, characterized in that: A dynamic sealing device for an additive manufacturing printing chamber as described in any one of claims 1 to 9.

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