Pulse type powder quantitative supply device and method thereof
阅读说明:本技术 脉冲式粉体定量供给装置及其方法 (Pulse type powder quantitative supply device and method thereof ) 是由 庞伟 俞红祥 董胜男 于 2020-07-08 设计创作,主要内容包括:本发明提供一种脉冲式粉体定量供给装置及其方法,该装置包括刚性腔体,开合单元,脉冲控制单元和出料单元,位于刚性腔体底部的铺粉平台和设置于铺粉平台上方且固定于刚性腔体的顶部用于存放材料粉体的储粉容器,储粉容器具有储粉腔,开合单元设置于储粉容器内部且位于储粉腔的下方,出料单元位于储粉腔和开合单元之间,出料单元具有出料口,出料口连通于储粉腔,脉冲控制单元连接于开合单元能够控制开合单元交替地处于开启状态或者闭合状态,当开合单元处于开启状态时,材料粉体能够通过出料口掉落到铺粉平台上形成目标铺粉面,当开合单元处于闭合状态时,材料粉体被阻挡在开合单元上方,该装置具有出粉速度快,供粉量可控的特点。(The invention provides a pulse type powder quantitative supply device and a method thereof, the device comprises a rigid cavity, an opening and closing unit, a pulse control unit and a discharging unit, a powder spreading platform positioned at the bottom of the rigid cavity and a powder storage container which is arranged above the powder spreading platform and fixed at the top of the rigid cavity and used for storing material powder, the powder storage container is provided with a powder storage cavity, the opening and closing unit is arranged in the powder storage container and positioned below the powder storage cavity, the discharging unit is positioned between the powder storage cavity and the opening and closing unit, the discharging unit is provided with a discharging hole which is communicated with the powder storage cavity, the pulse control unit is connected with the opening and closing unit and can control the opening and closing unit to be alternately in an opening state or a closing state, when the opening and closing unit is in the opening state, the material powder can fall onto the powder spreading platform through the discharging hole to form a target powder spreading surface, the material powder is blocked above the opening and closing unit, and the device has the characteristics of high powder discharging speed and controllable powder supply amount.)
1. The utility model provides an pulsed powder ration feeding device, includes rigidity cavity (10), is located shop powder platform (70) of rigidity cavity (10) bottom and set up in shop powder platform (70) top just is fixed in store up powder container (20) that the top of rigidity cavity (10) is used for depositing material powder (80), its characterized in that, pulsed powder ration feeding device still including open and shut unit (30), ejection of compact unit (40) and pulse control unit (50), store up powder container (20) and have store up powder chamber (21), open and shut unit (30) set up in store up inside powder container (20) and be located store up the below in powder chamber (21), ejection of compact unit (40) are located store up powder chamber (21) with between open and shut unit (30), ejection of compact unit (40) have discharge gate (41), discharge gate (41) communicate in store up powder chamber (21), the pulse control unit (50) is connected to the opening and closing unit (30) and can control the opening and closing unit (30) to be in an opening state or a closing state alternatively; when the opening and closing unit (30) is in an opening state, the material powder (80) can fall onto the powder spreading platform (70) through the discharge hole (41) to form a target powder spreading surface, and when the opening and closing unit (30) is in a closing state, the material powder (80) is blocked above the opening and closing unit (30).
2. The pulse type powder quantitative supply device according to claim 1, wherein the opening and closing unit (30) comprises an air cavity shell (31) arranged on the inner wall of the powder storage container (20), and when the opening and closing unit (30) is in a closed state, the closed part of the air cavity shell (31) is in surface contact; when the opening and closing unit (30) is in an opening state, the air cavity shell (30) forms an opening (32), wherein the size of the opening (32) is larger than that of the discharge opening (41).
3. The pulse type powder quantitative supply device according to claim 2, wherein the pulse control unit (50) comprises a controller (51), an air compressor (52), a positive-negative pressure converter (53) and a three-way electric control air valve (54), the three-way electric control air valve (54) is respectively communicated with the air compressor (52), the positive-negative pressure converter (53) and the air cavity shell (31), the positive-negative pressure converter (53) is communicated with the air cavity shell (31), and the controller (51) is electrically connected with the three-way electric control air valve (54).
4. A pulse powder quantitative supply device according to claim 3, further comprising a valve unit (60) disposed at the bottom of the powder storage container (20), wherein the valve unit (60) comprises a baffle (61) having one end hinged to the sidewall of the powder storage container (20), an elastic element (62) having two ends disposed on the baffle (61) and the inner wall of the powder storage container (20), respectively, and a driving cylinder (63) having two ends disposed on the baffle (61) and the inner wall of the powder storage container (20), respectively, and the driving cylinder (63) is communicated with the air compressor (52).
5. The pulse type powder quantitative supply device according to claim 4, wherein the pulse control unit (50) further comprises an electromagnetic gas valve (64), the electromagnetic gas valve (64) is arranged between the driving cylinder (63) and the air compressor (52), and the electromagnetic gas valve (64) is electrically connected to the controller (51).
6. A pulse type powder quantitative supply device according to any one of claims 1 to 5, characterized in that the material unit (40) comprises a supporting protrusion (42) arranged inside the powder storage container (20), and a discharging supporting plate (43) arranged on the supporting protrusion (42), and the discharging port (41) is arranged on the discharging supporting plate (43).
7. The pulse type powder quantitative supply device according to claim 6, wherein the discharging unit (40) further comprises a limit sealing member (44), and the discharging support plate (43) is arranged between the support protrusion (42) and the limit sealing member (44).
8. A pulse type powder quantitative supply device according to claim 7, characterized in that the limit sealing member (44) comprises a limit hole formed on the side wall of the powder storage container (20) and a sealing member detachably and hermetically connected to the limit hole and partially protruding the inner wall of the powder storage container (20).
9. A pulse type powder quantitative supply device according to claim 6, characterized in that the discharge port (41) is a rectangular hole.
10. A pulse powder quantitative supply method using the pulse powder quantitative supply device according to any one of claims 1 to 9, the method comprising:
a pulse control signal is sent out through a pulse control unit (50) to control the opening and closing unit (30);
the opening and closing unit (30) is alternately in an opening state or a closing state in response to a pulse control signal sent by the pulse control unit (50).
11. The pulse powder quantitative supply method according to claim 10, wherein in the step of sending a pulse control signal for controlling the opening and closing unit (30) by the pulse control unit (50), further comprising the step of:
sending a pulse control signal through a controller (51) to control a three-way electric control air valve (54) to be alternately communicated and closed;
the three-way electric control air valve (54) responds to the pulse control signal and controls the positive-negative pressure converter (53) to be alternately in an inflation state or an air extraction state, and when the positive-negative pressure converter (53) is in the inflation state, the opening-closing unit (30) can be controlled to be in a closing state; when the positive-negative converter (53) is in the air-extracting state, the opening-closing unit (30) can be controlled to be in the opening state.
12. The pulse powder dosing method according to claim 11, further comprising, before the step of sending a pulse control signal through the controller (51) to control the three-way electronic control valve (54) to alternately communicate and close, the steps of:
and sending a control signal to an electromagnetic air valve (64) through a controller (51), wherein the electromagnetic air valve (64) controls the valve unit (60) to be in a working state, and when the valve unit (60) is controlled to be in the working state, a baffle (61) of the valve unit (60) is opened under the action of a driving cylinder (63).
Technical Field
The invention relates to the field of 3D printing, in particular to a pulse type powder quantitative supply device and a pulse type powder quantitative supply method.
Background
With the continuous improvement of the performance of the 3D printing equipment, the 3D printing process technologies and equipment of different types tend to be improved continuously, so that more and more materials with different materials and physical forms can be applied to the 3D printing equipment, and more diversified choices are provided for the progress and development of various industries. Different types of printing processes are determined by the types and forms of materials used in the corresponding processes, and from the perspective of material forms, solid wires (hot melt extrusion process, abbreviated as FDM), solid powder (hot melt bonding, abbreviated as SLS, hot melt bonding, abbreviated as SLM, direct metal deposition, abbreviated as DMD), liquid materials (three-dimensional light curing molding, abbreviated as SLA) and the like are correspondingly provided. Aiming at the solid powder material, a laser galvanometer two-dimensional scanning or ink-jet printing process is used in a processing mode, the capability similar to plane two-dimensional processing can be obtained, the printing efficiency is extremely high, the adaptability of the powder material on the forming principle is relatively wide, such as hot melt adhesion (SLS), hot melt bonding (SLM) and chemical reaction adhesion (ink-jet sand mold printing), therefore, the powder material 3D printing process also has a relatively wide application range in application, and has increasingly wide application in the fields of personal consumption, design prototype verification, industrial batch production and the like, wherein hot melt bonding (SLM) process equipment has relatively high precision and structural performance due to the formed part, and has wide application in the fields of aerospace, medical treatment and the like.
On the other hand, in the additive manufacturing equipment using the powder material, the existing powder material quantitative supply, uniform powder spreading in the powder bed equipment and the like limit the further improvement of the performance of the equipment due to the technical scheme of conveying the powder material in the equipment. Powder supply modes of powder bed equipment such as hot melt bonding (SLS) and hot melt bonding (SLM) are divided into upper powder supply and lower powder supply, and the upper powder supply mode has wide application in hot melt bonding (SLS) and hot melt bonding (SLM) equipment due to the advantages of compact structure, capability of realizing external continuous powder supply and the like. The upper powder feeding mode needs to realize two main functions, one is quantitative powder supply, the other is that the distribution of the powder on one side of the powder bed is matched with the powder quantity distribution required by the powder bed, and the two functions ensure the sufficient powder supply required by laying a layer of powder and simultaneously avoid much waste of residual powder. The existing method for quantitatively supplying powder is to use a servo motor to drive a powder supply gear to rotate and use a gear groove to realize quantitative powder supply, the gear mounting structure in the method is complex, the powder discharging speed is low, the powder clamping and leaking phenomena are easy to occur, and meanwhile, the powder quantity distribution after powder supply is matched with the shape of a powder bed under the condition that the printing breadth is continuously increased, if no effective corresponding scheme is available, the powder cannot be fully utilized, and the utilization efficiency of the powder is reduced.
At present, a pulse type powder quantitative supply method which is high in powder discharging speed, good in powder supply breadth adaptability and controllable in powder supply quantity distribution is still lacked for powder supply of hot melt bonding (SLS) and hot melt bonding (SLM) equipment.
Disclosure of Invention
In view of the above, it is desirable to provide a pulse type powder quantitative supply device and method thereof, which has the characteristics of fast powder discharging speed and controllable powder supply amount and distribution of powder supply.
The invention provides a pulse type powder quantitative supply device which comprises a rigid cavity, a powder spreading platform positioned at the bottom of the rigid cavity, a powder storage container which is arranged above the powder spreading platform and fixed at the top of the rigid cavity and used for storing material powder, an opening and closing unit, a pulse control unit and a discharging unit, wherein the powder storage container is provided with a powder storage cavity; when the opening and closing unit is in an opening state, material powder can fall onto the powder spreading platform through the discharge port to form a target powder spreading surface, and when the opening and closing unit is in a closing state, the material powder is blocked above the opening and closing unit.
So set up, send the pulse control signal through the pulse control unit and open and close with the turn of control unit that opens and shuts in turn to when realizing being in the open mode, can spread the material powder under the action of gravity and spill on spreading the powder platform, when being in the closed condition, close the powder process of spreading of material powder, so that the material powder that is in discharge gate position of ejection of compact unit tends to the unanimous state, when being in the open mode with the unit that opens and shuts next time, spreads the powder. The pulse control unit can control the time of single pulse and combine the size of discharge gate, can realize the quantitative control to the powder supply volume and have the fast characteristics of powder outlet speed.
In one embodiment of the invention, the opening and closing unit comprises an air cavity shell arranged on the inner wall of the powder storage container, and when the opening and closing unit is in a closed state, the closed part of the air cavity shell is in surface contact; when the opening and closing unit is in an opening state, the air cavity shell forms an opening, wherein the size of the opening is larger than that of the discharge hole.
So set up, when the unit that opens and shuts is in the open mode, the air cavity casing can not influence the powder process of spreading of material powder, and in addition, the air cavity casing can be in the closure state under the gas filled state, and when in the closure state, the closure mode of face contact has avoided the material powder to drop on spreading the powder platform and has realized the ration under the single pulse material powder better.
In an embodiment of the present invention, the pulse control unit includes a controller, an air compressor, a positive-negative pressure converter and a three-way electric control air valve, the three-way electric control air valve is respectively communicated with the air compressor, the positive-negative pressure converter and the air cavity housing, the positive-negative pressure converter is communicated with the air cavity housing, and the controller is electrically connected to the three-way electric control air valve.
So set up, can aerify or bleed the air cavity casing that the opposition of unit that opens and shuts formed, realize the control to the state of opening and shutting of unit, in addition, the controller can control the time of pulse and set for, can further adjust the accurate control of single pulse in-process to the ration.
In an embodiment of the invention, the pulse type powder quantitative supply device further comprises a valve unit arranged at the bottom of the powder storage container, the valve unit comprises a baffle plate with one end hinged to the side wall of the powder storage container, an elastic element with two ends respectively arranged on the baffle plate and the inner wall of the powder storage container, and a driving cylinder with two ends respectively arranged on the baffle plate and the inner wall of the powder storage container, and the driving cylinder is communicated with the air compressor.
With the arrangement, the valve unit can charge air into the driving cylinder when the device provided by the invention is started, so that the baffle plate of the valve unit is opened relative to the powder storage container, and the powder is supplied to the powder spreading platform when the opening and closing unit is in an opening state. When the device provided by the invention stops running, the gas in the driving cylinder is pumped out, and the bottom opening of the powder storage container is sealed by the baffle under the action of the elastic element, so that the powder storage container is sealed, and the material powder is prevented from falling onto the powder spreading platform.
In an embodiment of the invention, the pulse control unit further includes an electromagnetic air valve, the electromagnetic air valve is disposed between the driving cylinder and the air compressor, and the electromagnetic air valve is electrically connected to the controller.
So set up, through the setting of electromagnetism pneumatic valve, can control valve unit better.
In one embodiment of the invention, the discharging unit comprises a supporting protrusion arranged inside the powder storage container, and a discharging supporting plate arranged on the supporting protrusion, and the discharging port is arranged on the discharging supporting plate.
So set up, can solve the problem of changing ejection of compact backup pad, change different ejection of compact backup pads and can realize having not unidimensional discharge gate, realize the regulation to single pulse powder output. The ejection of compact backup pad can be under the gravity pressure of material powder, fix on the support arch, and when the ejection of compact backup pad of not unidimensional needs to be changed, can conveniently take out the ejection of compact backup pad again from the support arch top.
In one embodiment of the invention, the discharging unit further comprises a limit sealing element, and the discharging supporting plate is arranged between the supporting protrusion and the limit sealing element.
So set up, in order to prevent that the ejection of compact backup pad from opening and shutting the unit and changing state process (including from open mode to closed state, perhaps from closed state to open mode), can receive the ascending power of unit that opens and shuts, lead to ejection of compact backup pad vibration or removal, be provided with spacing sealing member in the top of ejection of compact backup pad.
In one embodiment of the invention, the limiting sealing member comprises a limiting hole formed on the side wall of the powder storage container and a sealing member which is detachably and hermetically connected with the limiting hole and partially protrudes out of the inner wall of the powder storage container.
So set up, through the setting of spacing hole and sealing member, can dismantle more conveniently to the realization is to the change of ejection of compact backup pad.
In one embodiment of the invention, the discharge hole is a rectangular hole.
So set up the discharge gate into the rectangular hole, because the length of rectangular hole is not less than the length of shop's powder platform, the width of different rectangular holes will influence the play powder volume in the unit interval, and the width is relatively wider, and it is more to go out the powder volume, sets up the discharge gate into regular rectangle, can guarantee that the single goes out the powder and is even on length direction, goes out the powder back through many times pulse, and the distribution of total material powder is also even.
The invention also provides a pulse powder quantitative supply method, which adopts the pulse powder quantitative supply device, and the method comprises the following steps:
the pulse control unit sends out a pulse control signal to control the opening and closing unit;
responding to a pulse control signal sent by the pulse control unit, and enabling the opening and closing unit to be in an opening state or a closing state alternately; when the opening and closing unit is in an opening state, the material powder can fall onto the powder spreading platform through the discharge port to form a target powder spreading surface, and when the opening and closing unit is in a closing state, the material powder is blocked above the opening and closing unit.
In one embodiment of the present invention, the step of sending out the pulse control signal by the pulse control unit for controlling the opening and closing unit further comprises the steps of:
sending a pulse control signal through a controller to control the three-way electric control air valve to be alternately communicated and closed;
the three-way electric control air valve responds to the pulse control signal and controls the positive-negative pressure converter to be alternately in an inflation state or an air extraction state, and when the positive-negative pressure converter is in the inflation state, the opening-closing unit can be controlled to be in a closing state; when the positive and negative converters are in the air exhaust state, the opening and closing unit can be controlled to be in the opening state.
In one embodiment of the present invention, before the step of sending a pulse control signal through the controller to control the three-way electric control air valve to be alternately communicated and closed, the method further comprises the steps of:
and sending a control signal to the electromagnetic air valve through the controller, wherein the electromagnetic air valve controls the valve unit to be in a working state, and when the control valve unit is in the working state, a baffle of the valve unit is opened under the action of the driving cylinder.
Drawings
Fig. 1 is a schematic structural diagram of a pulse type powder quantitative supply device according to the present invention.
Fig. 2 is a schematic structural diagram of the pulse type powder quantitative supply device according to the above embodiment of the present invention when not in operation.
Fig. 3 is a schematic structural diagram of the pulse type powder quantitative supply device according to the above embodiment of the present invention when the opening and closing unit is in an open state.
Fig. 4 is a schematic structural diagram of the pulse type powder quantitative supply device according to the above embodiment of the present invention, in which the opening and closing unit is in a closed state and the valve unit is in an open state.
Fig. 5 is a schematic block diagram illustrating the connection between the controller of the pulse type powder quantitative supply device and other devices according to the above embodiment of the present invention.
10. A rigid cavity; 20. a powder storage container; 21. a powder storage cavity; 30. an opening and closing unit; 31. an air cavity housing; 32. opening the opening; 40. a discharging unit; 41. a discharge port; 42. a support boss; 43. a discharging support plate; 44. a limiting sealing element; 50. a pulse control unit; 51. a controller; 52. an air compressor; 53. a positive-negative voltage converter; 54. a three-way electric control air valve; 60. a valve unit; 61. a baffle plate; 62. an elastic element; 63. a drive cylinder; 64. an electromagnetic gas valve; 65. sealing gaskets; 70. a powder laying platform; 80. and (3) material powder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly mounted on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a schematic structural diagram of a pulse type powder quantitative supply device according to an embodiment of the present invention. The invention provides a pulse type powder quantitative supply device which is used for quantitatively supplying powder to printing equipment. The invention provides a pulse type powder quantitative supply device which can be used for supplying material powder for hot melt adhesive bonding (SLS) or hot melt bonding (SLM) equipment and has the characteristics of high powder discharging speed, good adaptability of powder supply breadth and controllable powder supply distribution. In the present invention, the material powder refers to toner powder.
As shown in fig. 1 and 3, the pulse type powder quantitative supply device provided by the present invention includes a
As shown in fig. 2, the opening and
Of course, it will be understood by those skilled in the relevant art that in other embodiments of the present invention, the
In addition, on the uniformity problem of the whole opening and closing process of the opening and
As shown in fig. 1 and fig. 2, in order to better control the
As shown in fig. 2, the discharging unit 40 includes a supporting protrusion 42 disposed inside the
Further, as shown in fig. 2, in order to prevent the discharging support plate 43 from being pressed by the opening and
As shown in fig. 3 and fig. 4, the opening and
Specifically, the pulse type quantitative powder supply provided by the invention has the following realization principle: because the pressure applied to the discharging support plate 43 installed in the
The opening and
In addition, in order to better control the powder feeding speed and the uniform distribution of the material powder 80, the control of the powder feeding speed may be achieved by changing the width of the discharge hole 41, for example, the discharge hole 41 of the discharge supporting plate 43 is implemented as a rectangular hole, the length of the rectangular hole is ensured to be not less than the length of the target powder laying surface, the amount of the material powder 80 falling by the movement of the proximity free fall body is different according to different widths, and the time interval between the open state and the closed state of the opening and
In addition, the pulse type powder quantitative supply device provided by the invention can improve the precision of single powder supply by adjusting the time of single pulse in order to improve the control of the powder supply speed and precision. For example, since the amount of powder close to the free fall is fixed, the time for which these powders fall is fixed; at this time, it is assumed that the time for the opening/
As shown in fig. 1 to 4, in order to ensure that the material powder 80 does not flow downward after the device provided by the present invention is in a power-off standby state, the pulse type powder quantitative supply device further includes a
In other embodiments of the invention, a sealing gasket 65 is provided at one end of the
In order to better perform automatic control of the
The invention also provides a pulse powder quantitative supply method aiming at the pulse powder quantitative working device, which comprises the following steps:
a pulse control signal is sent by the
the opening and
In one embodiment of the present invention, in the step of sending a pulse control signal by the
sending a pulse control signal through the controller 51 to control the three-way electric
the three-way electric
In an embodiment of the present invention, before sending the pulse control signal through the controller 51 to control the three-way electronic
the
The specific embodiment of the pulse type powder quantitative supply method provided by the invention has been described in detail when the pulse type powder quantitative supply is described, and is not described herein again.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that suitable changes and modifications of the above embodiments are within the scope of the claimed invention as long as they are within the spirit and scope of the present invention.
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