CN212331853U

CN212331853U - Pulse type powder quantitative supply device

Info

Publication number: CN212331853U
Application number: CN202021323560.8U
Authority: CN
Inventors: 庞伟; 俞红祥; 董胜男
Original assignee: Hangzhou Dedi Intelligent Technology Co ltd
Current assignee: Hangzhou Dedi Intelligent Manufacturing Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2021-01-12
Anticipated expiration: 2030-07-08

Abstract

The utility model provides a pulse type powder quantitative supply device, which 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, wherein the powder storage container is provided with a powder storage cavity, the opening and closing unit is arranged inside 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 port 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 port to form a target powder spreading surface, when the opening and closing unit is in the closing state, the device has the characteristics of high powder discharging speed and controllable powder supply amount.

Description

Pulse type powder quantitative supply device

Technical Field

The utility model relates to a 3D prints the field, especially relates to an impulse type powder ration device.

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.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a pulse type powder quantitative supply device, which has the characteristics of fast powder discharging speed and controllable powder supply amount and distribution of the powder.

The utility model provides a pair of pulsed powder ration feeding device, including the rigidity cavity, be located shop's powder platform of rigidity cavity bottom with set up in shop's powder platform top and be fixed in the powder storage container that the top of rigidity cavity is used for depositing the material powder, pulsed powder ration feeding device still includes the unit that opens and shuts, pulse control unit, and discharging unit, the powder storage container has a powder storage chamber, the unit that opens and shuts sets up in the inside of powder storage container and is located the below in powder storage chamber, discharging unit is located between powder storage chamber and the unit that opens and shuts, discharging unit has a discharge gate, the discharge gate communicates in powder storage chamber, pulse control unit connect in the unit that opens and shuts can control the unit that opens and shuts alternately is in open mode or closed state; 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 an embodiment of the present invention, the opening and closing unit includes an air cavity housing disposed on an inner wall of the powder storage container, and when the opening and closing unit is in a closed state, a closed portion of the air cavity housing 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 utility model, the pulse control unit includes the controller, the air compressor machine, positive negative pressure converter and tee bend automatically controlled pneumatic valve, tee bend automatically controlled pneumatic valve communicate respectively in the air compressor machine, positive negative pressure converter with the air cavity casing, positive negative pressure converter communicate in the air cavity casing, the controller electricity connect in tee bend automatically controlled pneumatic 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 present invention, the pulsed powder quantitative supply device further includes a valve unit disposed at the bottom of the powder storage container, the valve unit includes a baffle hinged to the sidewall of the powder storage container at one end, and two ends of the valve unit are respectively disposed at the baffle and the elastic element of the inner wall of the powder storage container, and two ends of the valve unit are respectively disposed at the baffle and the driving cylinder on the inner wall of the powder storage container, and the driving cylinder is communicated with the air compressor.

According to the configuration, the valve unit can be in the utility model provides a when the device starts, fill into gas in to the driving cylinder to open valve unit's baffle for storing up the powder container, so that supply the powder to shop's powder platform when the unit that opens and shuts is in the open mode. When the device provided by the utility model during the shutdown, take out the gas in the driving cylinder, under elastic element's effect, through the sealed bottom opening who stores up the powder container of baffle, realize the sealed of storing up the powder container, prevent that the material powder from dropping on the shop powder platform.

In an embodiment of the present invention, the valve unit further includes a sealing gasket, the sealing gasket is disposed at one end of the baffle and/or the sealing gasket is disposed at a side wall close to the bottom opening of the powder storage container, and the baffle can seal the bottom opening of the powder storage container.

So set up, the seal gasket of setting is in order to realize the better sealed of bottom opening with storing up the powder container.

In an embodiment of the present 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 an embodiment of the present invention, the discharging unit includes a supporting protrusion disposed inside the powder storage container, and a discharging supporting plate disposed on the supporting protrusion, and the discharging port is disposed in 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 an embodiment of the present invention, the discharging unit further includes a limit sealing member, and the discharging supporting plate is disposed between the supporting protrusion and the limit sealing member.

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 an embodiment of the present invention, the limit sealing member includes a limit hole formed on the sidewall of the powder storage container and a sealing member detachably and hermetically connected to the limit hole and partially protruding from 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 an embodiment of the present 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.

Drawings

Fig. 1 is a schematic structural diagram of a pulse type powder quantitative supply device of 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 the 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 when the opening and closing unit is in the closed state and the valve unit is in the open state.

Fig. 5 is a schematic block diagram illustrating the connection between the controller and other devices of the pulse type powder quantitative supply device 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 described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection 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 utility model provides an impulse type powder quantitative supply device for carry out powder quantitative supply for printing apparatus. The utility model provides an impulse type powder ration feeding device can be used to the material powder's of hot melt bonding (SLS) or hot melt combination (SLM) equipment supply, has out powder fast, supplies powder breadth width adaptability good, supplies the controllable characteristics of powder volume distribution. In the present invention, the material powder is powdered ink.

As shown in fig. 1 and to fig. 3, the utility model provides a pair of pulsed powder ration feeding device, including rigid cavity 10, powder storage container 20, unit 30 opens and shuts, discharging unit 40, valve unit 60 and shop's powder platform 70, wherein, shop's powder platform 70 is located rigid cavity 10 bottom, and powder storage container 20 sets up in shop's powder platform 70 top and is fixed in the top of rigid cavity 10 and is used for depositing the powder storage container 20 of material powder 80, and powder storage container 20 has one and is located the powder storage chamber 21 that stores up powder container 20 upper portion, and powder storage chamber 21 is used for depositing material powder 80. The opening and closing unit 30 is arranged in the powder storage container 20 and located below the powder storage cavity 21, the discharging unit 40 is located between the powder storage cavity 21 and the opening and closing unit 30, the discharging unit 40 is provided with a discharging hole 41, the discharging hole 41 is communicated with the powder storage cavity 21 so that the material powder 80 in the powder storage cavity 21 can fall onto the powder spreading platform 70 through the discharging hole 41, and 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 alternately in an opening state or a closing state; when the opening and closing unit 30 is in the open state, the material powder 80 can fall onto the powder spreading platform 70 through the discharge port 41 to form a target powder spreading surface, when the opening and closing unit 30 is in the closed state, the material powder 80 is blocked above the opening and closing unit 30, and the pulse control unit 50 sends out a pulse control signal to control the opening and closing of the opening and closing unit 30 alternately, so that the material powder 80 can be spread on the powder spreading platform 70 under the action of gravity when the opening and closing unit 30 is in the closed state, and the powder spreading process of the material powder 80 is closed when the opening and closing unit 30 is in the closed state, so that the material powder 80 at the discharge port 41 of the discharge unit 40 tends to be in a consistent state, and powder spreading is performed when the opening and closing unit 30 is in the open state next time. The pulse control unit 50 can control the time of a single pulse and combine with the size of the discharge hole 41, can realize quantitative control of the powder supply amount and has the characteristic of high powder discharging speed. It should be noted that the term "pulse type" herein means that the opening and closing unit 30 is alternately in the open state and the closed state. The time of the single pulse can be set by the pulse control unit 50, and the time of the single pulse is equal to the time of maintaining the one-time open state plus the time of maintaining the one-time closed state.

As shown in fig. 2, the opening and closing unit 30 may include an air cavity housing 31 disposed on an inner wall of the powder storage container 20, and when the opening and closing unit 30 is in a closed state, a closed portion of the air cavity housing 31 is in surface contact; when the opening and closing unit 30 is in an open state, the air cavity housing 31 forms an opening 32, wherein the size of the opening is larger than that of the discharge port 41, so that the material powder 80 does not contact the air cavity housing in the powder laying process of the material powder 80. The air cavity shell 31 can be in a closed state in an inflated state, and in the closed state, the surface-to-surface contact closing mode better prevents the material powder 80 from falling onto the powder laying platform 70, and better realizes quantitative supply of the material powder 80 under single pulse. Preferably, the air cavity housing 31 can control the expansion and contraction of the volume thereof by positive pressure or negative pressure, so as to control whether the material powder 80 in the powder storage container 20 flows out, and the surface material of the air cavity housing 31 may have certain toughness and softness, so as to effectively block the flowing material powder 80. Specifically, after the air chambers at the two ends of the air chamber shell 31 are inflated, the air chambers are contacted and closed below the discharging unit 40, and two contact surfaces at the closed position have certain thickness and certain toughness. Even if the material powder 80 exists between the two closed surfaces after the closing, the surface material thereof is passively deformed in accordance with the shape of the powder, and the material powder 80 is fixed between the joining surfaces without affecting the closing of the whole of the two closed surfaces.

Of course, it should be understood by those skilled in the relevant art that in other embodiments of the present invention, the air cavity housing 31 may be provided in at least two, at least two air cavity housings 31 being oppositely disposed on the inner wall of the powder storage container 20.

In addition, on the uniformity problem of the whole opening and closing process of the opening and closing unit 30, except that the positive-negative pressure converter 53 can make the air cavity in the air cavity shell 31 expand or contract integrally in the process of inflating or exhausting, because the contact surface material of the air cavity shell 31 has certain toughness, the position expanded or contracted firstly can also drive the position beside to move, and then the uniformity of the opening and closing unit 30 in the opening and closing process is improved. Furthermore, by the utility model provides a unit 30 that opens and shuts's structure can know, the utility model provides a unit 30 that opens and shuts's simple structure, air cavity casing 31's structure has elasticity, all has better adaptability to different material powder 80.

As shown in fig. 1 and fig. 2, in order to better control the air cavity housing 31 of the opening and closing unit 30, the opening and closing state and the closing state can be performed in a pulse manner, in an embodiment of the present invention, the pulse control unit 50 can include 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 housing 31, the positive/negative pressure converter 53 is communicated with the air cavity housing 31, the controller 51 is electrically connected to the three-way electric control air valve 54, the controller 51 sends a pulse control signal to control the three-way electric control air valve 54, and then the positive/negative pressure converter 53 is controlled to alternately inflate or deflate the air cavity housing 31 formed by the opposition of the opening. The controller 51 can control the timing of the single pulse and can further adjust the precise control of the dosing during the single pulse. Here, the pulse control signal sent by the controller 51 may be understood that the controller 51 sends a command for controlling the alternate opening and closing of each channel of the three-way electronic control air valve 54 to realize the pulse inflation or air suction of the positive and negative pressure exchanger 53, so as to realize the pulse control of the opening and closing state of the opening and closing unit 30.

As shown in fig. 2, the discharging unit 40 includes a supporting protrusion 42 disposed inside the powder storage container 20, and a discharging supporting plate 43 disposed on the supporting protrusion 42, and the discharging hole 41 is disposed on the discharging supporting plate 43, and preferably, the discharging hole 41 is configured as a rectangular hole. Preferably, the discharge hole 41 is an elongated rectangular hole. Since the discharging support plate 43 is supported by the support protrusion 42, the length and width of the discharging support plate 43 can be adapted to the size of the powder storage container 20, so that the discharging support plate 43 can be just put into the powder storage container 20 and supported by the support protrusion 42.

Further, as shown in fig. 2, in order to prevent the discharging support plate 43 from being pressed by the opening and closing unit 30 during the process of changing the state of the opening and closing unit 30 (including the process of changing the opening and closing unit 30 from the open state to the closed state, or from the closed state to the open state), the discharging support plate 43 may move upwards, a limit sealing member 44 is disposed above the discharging support plate 43, and the discharging support plate 43 is disposed between the support protrusion 42 and the limit sealing member 44. Preferably, the position-restricting sealing member 44 includes a position-restricting hole formed in a side wall of the powder storage container 20 and a sealing member 65 detachably and sealingly coupled to the position-restricting hole and partially protruding from an inner wall of the powder storage container 20. Here, the stopper hole may be implemented as a screw hole, and the sealing member 65 may be implemented as a screw fitted to the screw hole. Therefore, the utility model provides an ejection of compact backup pad 43 of ejection of compact unit 40 can be changed, and then can establish the requirement that different material powder 80 distribute through the size that changes ejection of compact backup pad 43's discharge gate 41, has improved the commonality and the suitability of this device.

As shown in fig. 3 and fig. 4, the opening and closing unit 30 of the pulse type powder quantitative supply device provided by the present invention is illustrated in an open state and a closed state, respectively. When the opening and closing unit 30 is in the open state, at least two opposite air cavity shells 31 form an opening 32, at this time, the opening 32 corresponds to the discharge port 41, and the material powder 80 in the powder storage cavity 21 can fall through the discharge port 41. When the opening and closing unit 30 is in the closed state, the material powder 80 is blocked above the opening and closing unit 30.

Specifically, the utility model provides an impulse type ration supplies powder's realization principle does: because the pressure applied to the discharging support plate 43 installed in the powder storage container 20 is only influenced by the installation angle and the powder storage amount of the powder storage container 20, the external powder supply and storage links will not influence the pressure of the discharging unit 40 through design, for example, the powder is supplied to the powder storage container 20 through a transverse pipeline conveying manner. Therefore, at the moment when the opening and closing unit 30 under the discharging support plate 43 is opened, the pressure and gravity of the powder 80 of the same type at the discharging port 41 are stable and will not be affected by the external powder path state. After the opening and closing unit 30 is opened, the material powder 80 in or above the discharge port 41 of the discharge supporting plate 43 will first make a free-falling motion downward, and the material powder 80 below will flow downward, wherein the material powder 80 farther away from the discharge port 41 will not move in a free-falling manner and will be disturbed by the flowing of the material powder 80 in all directions. Therefore, since the size of the discharge hole 41 is fixed, the amount and distance of the material powder 80 falling within a certain time are stable, and the time of the single pulse, more specifically, the time of the single pulse, during which the opening and closing unit 30 maintains the open state and the closed state, is set by the controller 51, so as to ensure that the material powder 80 falling relatively close to the free-fall form is allowed to flow out, so that the material powder 80 in the free-fall form is stably separated.

The opening and closing unit 30 is ensured to be in an opening state or a closing state in a pulse mode with a certain frequency, so that the time point of the material powder 80 flowing out is always performed under the condition that the material powder 80 in the powder storage cavity 21 is static, and the state of the material powder 80 in the powder storage cavity 21 is the same when the air cavity shell 31 of the opening and closing unit 30 is opened every time. This is because the time for which the opening and closing unit 30 is kept in the open state is the same each time, and it can be determined that the powder discharge amount is constant in each open state. Therefore, the continuous pulse material powder 80 with the same powder discharging amount each time is obtained, the pulse control unit 50 controls the opening and closing unit 30 to continuously pulse and discharge the powder m times before the material powder 80 made of a certain material, then the total weight k of the material powder 80 is weighed, the weight of the single pulse discharged powder is obtained to be k/m, and the total powder discharging amount is controlled according to the powder discharging amount of the single pulse and the pulse powder discharging times in the using process of the device. Therefore, the utility model provides an impulse type powder ration feeding device, its uniformity that goes out the powder is controllable and have stable play powder state, goes out the powder under this state, and the volume of going out the powder at every turn equals, can realize accurate control play powder volume after going out the demarcation of powder total amount and pulse number of times to the material powder 80 of new use.

In addition, in order to better achieve control of the powder supply speed and uniform distribution of the material powder 80, the control of the powder supply speed may be achieved by changing the width of the discharge port 41, for example, the discharge port 41 of the discharge support plate 43 is implemented as a rectangular hole having a lengthTo ensure that the powder quantity is not less than the length of the target powder laying surface, the quantity of the falling material powder 80 approaching the free falling body movement is different corresponding to different widths, and the falling distances are the same, so that the time intervals of the opening and closing unit 30 in the opening state and the closing state are the same each time, and the wider the width of the discharge port 41 is, the faster the powder discharging speed is. The discharge port 41 is regular rectangular, so that the powder discharged in a single time is uniform in the length direction, and after the powder is discharged by multiple pulses, the material powder 80 is uniformly distributed. When the powder spreading surface is wider, the width of the opening port 32 of the corresponding opening and closing unit 30 is ensured to be not less than the width of the powder spreading surface, and when the air cavity shell 31 of the opening and closing unit 30 is filled with air to be in a closed state or pumped out air to be in an open state, the falling distance of the free falling object is 0.5 x at as long as the relation s of the time²Wherein a is acceleration and takes 9.8m/s²S is the distance from the discharge support plate 43 to the lower surface of the air cavity housing 31, and it is found that the time t for the opening and closing unit 30 to be in the open state and to be maintained is about √ (2s/a) second, the material powder 80 in the same state will fall onto the powder spreading platform 70 in this time, when the opening and closing unit 30 is in the closed state, the other falling material powder 80 will be blocked on the opening and closing unit 30 or fixed between the contact surfaces of the opposite air cavity housing 31, and the time for the opening and closing unit 30 to be maintained in the closed state is determined by the time required for the material powder 80 in the powder storage cavity 21 to be stationary. Especially in the application of big breadth shop powder, the utility model provides a device can be fine expand and adapt to, and more traditional mode stability is higher, and the complexity is lower.

Furthermore, the utility model provides an impulse type powder ration feeding device can improve the precision that the single supplied the powder through the time of adjusting the single pulse in order to improve the control to supplying powder 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/closing unit 30 to maintain the closed/open state in a single pulse is t1, the fixed powder discharge amount is w1, and the adjustment time t1 is t2 (t 2< t1 is satisfied), so that the powder discharge amount per pulse can be adjusted to w2 (w 2< w1 at this time), and thus a smaller powder discharge amount per pulse can be realized, and the accuracy of the powder discharge amount control is improved.

As shown in fig. 1 to 4, in order to guarantee that the device provided by the utility model can not flow downwards at outage standby back material powder 80, this pulsed powder ration device is still including setting up in the valve unit 60 of storing up powder container 20 bottom, valve unit 60 includes that one end articulates the baffle 61 on the lateral wall of storing up powder container 20, both ends set up respectively in the elastic element 62 of the inner wall of baffle 61 and powder container 20 to and both ends set up respectively in the actuating cylinder 63 on the inner wall of baffle 61 and powder container 20, actuating cylinder 63 communicates in air compressor machine 52. Valve unit 60 can be when the device provided by the utility model starts, fill into gas in to actuating cylinder 63 to rotate valve unit 60's baffle 61 along articulated position, thereby open the bottom opening that stores up powder container 20, so that supply powder to shop's powder platform 70 when the unit 30 that opens and shuts is in the open mode. When the pulse type powder quantitative supply device stops operating, the gas in the driving cylinder 63 is pumped out, and under the action of the elastic element 62, the bottom opening of the powder storage container 20 is sealed through the baffle 61, so that the powder storage container 20 is sealed, and the material powder 80 is prevented from falling onto the powder laying platform 70. Preferably, the elastic element 62 may be embodied as a spring.

In other embodiments of the present invention, a sealing gasket 65 is disposed at one end of the baffle 61 to better seal the bottom opening of the powder storage container 20; a sealing gasket (not shown) may also be provided on the side wall of the powder reservoir 20 near the bottom opening to better seal the bottom opening. Of course, it will be understood by those skilled in the art that when the sealing gasket 65 is provided at one end of the baffle 61, it is provided at the end remote from the hinged connection of the baffle 61 and the powder reservoir 20 to effect that the sealing gasket 65 is used to seal the bottom opening of the powder reservoir 20. Therefore, the utility model provides a when the device outage was shut down, the spring draws and closes baffle 61, make it keep the closed condition, and there is seal gasket 65 at the closed position of baffle 61 and the lateral wall of storage powder container 20, the amount of the material powder 80 of storing between ejection of compact supporting part and pneumatic control valve unit 60 is few, the most part of material powder 80 pressure in the whole powder box is born by ejection of compact backup pad 43, pneumatic control valve unit 60's baffle 61 department is mostly material powder 80 and piles up naturally, so can satisfy the sealed demand of the material powder 80 under the standby.

In order to better perform automatic control of the valve unit 60, as shown in fig. 2 and 5, the pulse control unit 50 further includes an electromagnetic valve 64, the electromagnetic valve 64 is disposed between the driving cylinder 63 and the air compressor 52, and the electromagnetic valve 64 is electrically connected to the controller 51.

To foretell pulsed powder ration equipment, the utility model also provides a pulse powder ration method, and the method can include:

a pulse control signal is sent by the pulse control unit 50 for controlling the opening and closing unit 30;

the opening and closing unit 30 is alternately in an open state or a closed state in response to a pulse control signal from the pulse control unit 50.

In an embodiment of the present invention, in the step of sending the pulse control signal through the pulse control unit 50 for controlling the opening and closing unit 30, the method may further include the steps of:

sending a pulse control signal through the controller 51 to control the 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 to control 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 pumping state, the opening and closing unit 30 can be controlled to be in the open state.

In an embodiment of the present invention, before the step of sending the pulse control signal through the controller 51 to control the three-way electric control air valve 54 to be alternately connected and closed, the method may further include the steps of:

the solenoid valve 64 controls the valve unit 60 to be in the working state by sending a control signal to the solenoid valve 64 through the controller 51, and the flapper 61 of the valve unit 60 is opened by the driving cylinder 63 when the control valve unit 60 is in the working state.

To the specific implementation mode of the pulse type powder quantitative supply method provided by the utility model, the pulse type powder quantitative supply is introduced in detail, and the detailed description is omitted here.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims

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 (31) forms an opening port (32), wherein the size of the opening port (32) is larger than that of the discharge port (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. A pulse type powder quantitative supply device according to claim 4, characterized in that the valve unit (60) further comprises a sealing gasket (65), the sealing gasket (65) is arranged at one end of a baffle plate (61) and/or the sealing gasket is arranged at a side wall close to the bottom opening of the powder storage container (20), and the baffle plate (61) can seal the bottom opening of the powder storage container (20).

6. 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).

7. A pulse type powder quantitative supply device according to any one of claims 1 to 6, 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).

8. The pulse type powder quantitative supply device according to claim 7, 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).

9. A pulse type powder quantitative supply device according to claim 8, 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).

10. A pulse type powder quantitative supply device according to claim 9, wherein the discharge port (41) is a rectangular hole.