CN112484824B - Balance mechanism for fine detection of large powder amount - Google Patents
Balance mechanism for fine detection of large powder amount Download PDFInfo
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- CN112484824B CN112484824B CN202011287404.5A CN202011287404A CN112484824B CN 112484824 B CN112484824 B CN 112484824B CN 202011287404 A CN202011287404 A CN 202011287404A CN 112484824 B CN112484824 B CN 112484824B
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- bearing plate
- powder
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- bearing
- spring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/02—Means for automatically loading weigh pans or other receptacles, e.g. disposable containers, under control of the weighing mechanism
- G01G13/022—Material feeding devices
- G01G13/026—Material feeding devices by mechanical conveying means, e.g. belt or vibratory conveyor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
- G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge
- G01G13/248—Continuous control of flow of material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/02—Arrangements of bearings
- G01G21/10—Floating suspensions; Arrangements of shock absorbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to the technical field of additive manufacturing, in particular to a balancing mechanism for fine detection of large powder amount, which comprises: the bearing plate is fixed on the load surface of the powder feeding mechanism; the bearing plate is hinged with one side of the bearing plate through a horizontally arranged through shaft and is used for bearing the storage bin; the pressure sensor is arranged on one side, far away from the through shaft, of the bearing plate and used for detecting the pressure of the bearing plate reflected on the pressure sensor; the elastic supporting component is arranged between the bearing plate and used for supporting the bearing plate; the elastic supporting component comprises a spring and an actuating element for pressing the spring to change the supporting force of the spring on the supporting plate; the invention uses the elastic supporting part to balance the weight of the powder to be weighed to the range which can be measured by the small-range high-precision sensor, so that the powder feeding device can detect the variable quantity of the powder with higher precision in the powder feeding process, and the precision of the powder feeding device is improved.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a balancing mechanism for large powder amount fine detection.
Background
The additive manufacturing is a new manufacturing technology for manufacturing solid objects by stacking materials layer by layer on the basis of a digital model, embodies the close combination of an information network technology, an advanced material technology and a digital manufacturing technology, and is an important component of the advanced manufacturing industry.
At present, the metal rapid prototyping field is many, no matter emerging metal 3D prints or traditional laser dissolves and covers, all needs following core device's support, and laser instrument/processing head and powder feeder play the key effect of evenly carrying the powder as the powder feeder of core device, and the stability and the precision of powder feeder are directly influencing the printing quality and the printing precision of work piece, and it has very big meaning to promote the function of powder feeder.
In the prior art, the consumption of powder in a powder feeder is generally quantified and detected by a photoelectric sensor, but the quantification accuracy is low, or the consumption is judged by detecting the flow in a pipeline, the measurement accuracy of the method is related to the arrangement and the calculation mode of the sensor and is not stable enough, or the weighing type is used for detecting the weight change of the powder in a material barrel, but when the powder feeder is applied to large-powder weighing, the larger the measuring range of the sensor is, the lower the accuracy is, and the lower the accuracy is, so that the accuracy of the powder feeder is not high.
Documents of the prior art:
patent document 1: CN207908010U detection device of powder feeder powder bucket powder volume
Patent document 2: CN101629929B capacitive powder flow measurement system for laser remanufacturing
Disclosure of Invention
The invention aims to provide a balance mechanism for fine detection of large powder amount, which aims to detect the weight change of a large powder amount storage bin by using a small-range high-precision sensor.
In order to achieve the above object, the present invention provides a balancing mechanism for fine detection of a large amount of powder, comprising:
the bearing plate is fixed on the load surface of the powder feeding mechanism;
the bearing plate is hinged with one side of the bearing plate through a horizontally arranged through shaft and is used for bearing the storage bin;
the pressure sensor is arranged on one side of the bearing plate, which is far away from the through shaft, and is used for detecting the pressure of the bearing plate reflected on the pressure sensor;
the elastic supporting component is arranged between the bearing plate and used for supporting the bearing plate;
wherein, the elastic supporting component comprises a spring and an actuating element for pressing the spring to change the supporting force of the spring on the bearing plate so as to adjust the pressure of the bearing plate on the pressure sensor.
Preferably, the bearing plate and the bearing plate are rectangular plates, and the through shaft and the pressure sensor are arranged on the short side of the bearing plate and the bearing plate.
Preferably, a guide sleeve is arranged on the lower end face of the bearing plate, and the executing element comprises:
a driving motor fixed on the bearing plate;
the screw rod is connected to the output end of the driving motor;
the sliding block is connected to the inner wall of the guide sleeve in a sliding manner along the length direction of the guide sleeve;
the spring is positioned between the sliding block and the bearing plate;
the sliding block is in transmission connection with the screw rod to compress/release the spring and change the extrusion force of the spring on the bearing plate.
In another aspect of the present invention, a powder feeder includes a flow control mechanism, and the flow control mechanism is in signal connection with a pressure sensor in the balancing mechanism for fine detection of large powder amount.
Preferably, the flow control mechanism comprises an air valve, a spiral feeding part and a rotary feeding part.
It should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. Additionally, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a perspective view of a balancing mechanism for fine detection of large powder amount according to the present invention;
FIG. 2 is another schematic structural view of FIG. 1;
FIG. 3 is a front view of the balancing mechanism for fine detection of large amount of powder of the present invention;
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of the structure of the resilient support member of FIG. 4;
FIG. 6 is a force analysis diagram of FIG. 5;
FIG. 7 is a schematic structural view of an elastic support member in the balancing mechanism for fine detection of a large amount of powder according to the present invention;
fig. 8 is a schematic structural diagram of a slider in the balancing mechanism for fine detection of large amount of powder of the present invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
In this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to encompass all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways with any balancing mechanism for fine detection of large amounts of powder, as the disclosed concepts and embodiments are not limited to any implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
The powder feeder at present mainly has air-blowing type powder feeding, screw type powder feeding and rotary type powder feeding, wherein the air-blowing type powder feeder utilizes compressed gas to carry powder to a nozzle, a rotary metering disc or a metering shaft or a ratchet wheel can be adopted to meter powder feeding parts corresponding to the powder quantity, but whether the powder feeding of the parts is uniform or not depends on the variable quantity of the powder measured by gravity, and the weighing precision of the existing storage bin is not high, so that the accurate monitoring is difficult to realize; the spiral powder feeding mainly utilizes a spiral auger to convey materials, the output speed is controlled by the rotating speed, the powder mobility is not good enough, the powder can be output by carrying a cavity sometimes, the output is unstable, and the storage bin can not output and feed back to the rotating speed of the auger according to the weight change, so that the materials are conveyed unevenly.
The invention aims to balance most of the weight in the large-powder-quantity storage bin, then use a small-range and high-sensitivity pressure sensor to detect the variation of the whole powder weight, realize high-precision measurement by using a sensor with large selectable quantity and relatively low price, and directly reflect the conveying uniformity of a conveying part by accurately monitoring the variation of the powder in the storage bin, and indirectly control a flow control mechanism (such as an air valve for controlling air flow or a motor for controlling the rotating speed of a screw) by using feedback quantity to form closed-loop feedback so as to achieve more accurate control.
Referring to fig. 1 to 4, the balance mechanism for fine detection of large amount of powder provided in this embodiment includes a carrier plate 1 fixed to a load surface of a powder feeding mechanism. The through shaft 21 arranged horizontally is hinged to the bearing plate 2 on one side of the bearing plate 1, a groove is formed in the bearing plate 2 and can be used for bearing the bin 6, and the groove through which the feeding bin 6 penetrates is formed below the bearing plate 1 and connected with a powder feeding structure.
Alternatively, the silo 6 may be replaced by another device requiring weighing.
Preferably, the bearing plate 1 and the support plate 2 are configured as rectangular plates with the same shape, and an annular connecting structure for connecting through shafts 21 is provided at the short side of the rectangular plate, wherein the annular connecting structure is arranged above the bearing plate 1 and below the support plate 2, and the through shafts 21 penetrate through the annular connecting structure on the bearing plate 1 and the support plate 2, so that the bearing plate 1 and the support plate 2 can be relatively turned over along the through shafts 21, and a certain space is formed between the bearing plate 1 and the support plate 2.
Further, a pressure sensor 5 is arranged on the short edge of the side opposite to the connecting shaft 21, the supporting plate 2 abuts against the pressure sensor 5, the height of the pressure sensor 5 is the same as that of the annular connecting structure, the supporting plate 1 and the supporting plate 2 are arranged in parallel, and the pressure sensor 5 is used for detecting the pressure of the supporting plate 2 on the pressure sensor 5.
So, form lever principle between loading board 1 and the bearing board 2, feed bin 6 is preferred to be placed in the intermediate position department of bearing board 2, leads to axle 21 and forms the fulcrum of lever in loading board 1 and one side of bearing board 2, and pressure sensor 5 detects the weight of feed bin 6 on another limit of bearing board 2, because feed bin 6 is located the intermediate position department of bearing board 2, according to lever principle, the pressure that pressure sensor 5 received this moment is half of the weight of feed bin 6.
Furthermore, an elastic supporting component is arranged in the space between the bearing plate 1 and the bearing plate 2, so that the bearing plate 2 is supported.
Preferably, the two elastic supporting members are respectively arranged at two sides of the pressure sensor 5, so that the pressure born by each elastic supporting member is reduced, and the supporting force of the elastic supporting member to the supporting plate 2 is adjusted more accurately.
So, the elastic support part can share the pressure of bearing board 2 to pressure sensor 5, with the further reduction of the pressure that pressure sensor 5 received, consequently can select the less higher sensor of precision of range, the weight change of feed bin 6 in unit interval just can be sensitive like this be detected by the sensor, and then improve the powder feeding precision.
Referring to fig. 5 and 6, in this embodiment, the weight of the bin 6 is 100kg, the pressure of the bin 6 on the support plate 2 at the middle position of the support plate 2 is FA, the FA is 50kg, the elastic support member is disposed on the same side as the pressure sensor 5, the support force of the elastic support member on the support plate 2 is FN, the support force of the pressure sensor 5 on the support plate 2 is F0, and the support force FN of the elastic support member on the support plate 2 is adjusted to make FN reach 40kg, at this time, the range of the pressure sensor 5 is 10kg, the pressure sensor in this measurement range can detect gram-level variation, and if 10g of powder is reduced in the bin 6 per minute, the variation reflected on the pressure sensor 5 per minute is 5g per minute, which can be accurate to g as a unit, so as to improve the powder feeding accuracy.
Specifically, the elastic support means includes a spring 34 and an actuator for pressing the spring 34 to adjust a supporting force to the support plate 2.
In an alternative embodiment, more elastic support members may be provided to achieve the supporting force to the support plate 2, so that in the case of changing the supporting force by means of the displacement amount (by which the actuator presses the spring 34 to adjust the supporting force to the support plate 2), the elastic force of each elastic support member may be set smaller, and the gradient of the change of the supporting force is increased at the same displacement amount to increase the controllability.
As shown in fig. 5, a guide sleeve 4 is disposed on the lower end surface of the support plate 2, and the actuator includes:
the driving motor 3 is fixed on the bearing plate 2, and the driving motor 3 is fixed at the lower end of the bearing plate 2 through a rod-shaped support frame 11; a screw rod 32 connected to the output end of the driving motor 3; a sliding block 33 connected to the inner wall of the guide sleeve 4 in a sliding manner along the length direction of the guide sleeve 4; the spring 34 is located between the slide 33 and the support plate 2.
So, driving motor 3 can be accurate drive lead screw 32 rotate, makes slider 33 take place controllable displacement, changes the holding power of spring 34 to bearing board 2, makes the pressure that pressure sensor 5 accepted in its range, keeps the accurate control to weight change in the feed bin.
Further, in this embodiment, after the detection of one measurement range is completed, for example, after 20kg of powder in the bin 6 is completely flowed, the pressure sensor 5 changes from 10kg to 0, and in a short time (within one minute or less), the driving motor 3 controls the sliding block 33 to move, so that the pressure of the spring 34 is reduced to 30kg, and at this time, the pressure sensor 5 is still pressed by 10kg, and the pressure sensor 5 enters the next measurement range, and in this time interval, the detected data is ignored, and the time interval is filled according to the average value of the actual flow loss of the previous minute and the actual flow loss of the next minute.
In alternative embodiments, the actuator may be other electric telescopic structures or a pneumatic or hydraulic linear push rod.
Preferably, the axial direction of the screw 32 is perpendicular to the support plate 2.
As shown in fig. 7 and 8, the upper end of the screw 32 penetrates through the support plate 2, and the upper end thereof has a limit plate 31, and the diameter of the limit plate 31 is larger than that of the screw 32.
Thus, when the spring 34 pushes the support plate 2 upwards too much, the limiting plate 31 plays a role in protection and limiting, and the support plate 2 is prevented from overturning.
Further, a bearing 41 is arranged on the bearing plate 2, and the screw rod 32 is attached to the inner ring of the bearing 41 and is rotatably connected with the bearing plate 2.
In this way, when the screw 32 rotates, the state of its rotation can be kept stable by the arrangement of the bearing 41, and the bearing 41 and the screw 32 have no force in the axial direction against each other.
Specifically, the outer wall of the slider 33 is provided with a limiting portion 331, and the inner wall of the guide sleeve 4 is provided with a guide portion engaged with the limiting portion 331.
Therefore, the screw rod 32 and the sliding block 33 can be kept in the process of screw transmission, the sliding block 33 cannot rotate in the circumferential direction, and can be displaced along the axial direction of the screw rod 32.
In an alternative embodiment, the position-limiting part 331 can be designed as a projection or a depression, and the guide part can be correspondingly designed as a groove or a protruding guide strip.
The invention provides another embodiment, and the powder feeder comprises a flow control mechanism which is in signal connection with the pressure sensor 5 in the balance mechanism for the fine detection of the large powder amount in the scheme.
Specifically, the flow control mechanism comprises an air valve, a spiral feeding component and a rotary feeding component.
In combination with the above embodiments, the invention balances the weight of the powder to be weighed to the measurable range of the small-range high-precision sensor by using the elastic supporting part on the basis of weight reduction of the lever principle, has high flexibility and high variability, can detect the variable quantity of the powder with higher precision in the powder feeding process, and forms closed-loop feedback regulation by matching with the flow control mechanism so as to improve the powder feeding precision of the current mainstream powder feeder.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (11)
1. A balance mechanism for fine detection of large powder amount, comprising:
the bearing plate is fixed on the load surface of the powder feeding mechanism;
the bearing plate is hinged with one side of the bearing plate through a horizontally arranged through shaft and is used for bearing the stock bin; the bin is positioned in the middle of the bearing plate;
the pressure sensor is arranged on one side, far away from the through shaft, of the bearing plate and used for detecting the pressure of the bearing plate reflected on the pressure sensor;
the elastic supporting component is arranged between the bearing plate and used for supporting the bearing plate;
wherein, the elastic supporting component comprises a spring and an actuating element for pressing the spring to change the supporting force of the spring on the bearing plate so as to adjust the pressure of the bearing plate on the pressure sensor.
2. The balancing mechanism for fine detection of large amount of powder according to claim 1, wherein the loading plate and the supporting plate are rectangular plates, and the through shaft and the pressure sensor are respectively disposed at both short sides of the loading plate and the supporting plate.
3. The balance mechanism for fine detection of large amount of powder according to claim 1, wherein a guide sleeve is provided on a lower end surface of the support plate, and the actuator comprises:
a driving motor fixed on the bearing plate;
the screw rod is connected to the output end of the driving motor;
the sliding block is connected to the inner wall of the guide sleeve in a sliding manner along the length direction of the guide sleeve;
the spring is positioned between the sliding block and the bearing plate;
the sliding block is in transmission connection with the screw rod to compress/release the spring and change the extrusion force of the spring on the bearing plate.
4. The balancing mechanism for fine detection of large powder amount according to claim 3, wherein an axial direction of the screw is perpendicular to the support plate.
5. The balance mechanism for fine detection of large amount of powder according to claim 4, wherein the screw rod has an upper end penetrating through the support plate and an upper end having a limiting plate, the diameter of the limiting plate being larger than that of the screw rod to limit the support plate from being turned over by the spring force.
6. The balance mechanism for fine detection of large amount of powder according to claim 5, wherein the bearing plate is provided with a bearing, and the screw rod is attached to an inner ring of the bearing and is rotatably connected with the bearing plate.
7. The balance mechanism for finely detecting the large amount of powder according to claim 4, wherein the outer wall of the slide block is provided with a limiting part, and the inner wall of the guide sleeve is provided with a guide part matched with the limiting part.
8. The balancing mechanism for fine detection of large powder amount according to any one of claims 1 to 7, wherein the carrying plate and the supporting plate are arranged in parallel.
9. The balancing mechanism for fine detection of large amount of powder according to claim 1, wherein the elastic supporting members include two, which are respectively disposed at both sides of the pressure sensor.
10. A powder feeder comprising a flow control mechanism, characterized in that the flow control mechanism is in signal connection with a pressure sensor in a balancing mechanism for fine detection of large powder amount according to any one of claims 1-7.
11. The powder feeder of claim 10, wherein the flow control mechanism comprises an air valve, a helical feed member, and a rotary feed member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210900047.8A CN115265729B (en) | 2020-09-30 | 2020-11-17 | Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020110653550 | 2020-09-30 | ||
| CN202011065355 | 2020-09-30 |
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| CN202210900047.8A Division CN115265729B (en) | 2020-09-30 | 2020-11-17 | Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing |
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| CN112484824A CN112484824A (en) | 2021-03-12 |
| CN112484824B true CN112484824B (en) | 2022-08-16 |
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| CN202011287404.5A Active CN112484824B (en) | 2020-09-30 | 2020-11-17 | Balance mechanism for fine detection of large powder amount |
| CN202022659504.8U Active CN213729329U (en) | 2020-09-30 | 2020-11-17 | Balance mechanism and powder feeder for fine detection of large powder amount |
| CN202210900047.8A Active CN115265729B (en) | 2020-09-30 | 2020-11-17 | Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing |
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| CN202022659504.8U Active CN213729329U (en) | 2020-09-30 | 2020-11-17 | Balance mechanism and powder feeder for fine detection of large powder amount |
| CN202210900047.8A Active CN115265729B (en) | 2020-09-30 | 2020-11-17 | Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing |
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| CN112484824B (en) * | 2020-09-30 | 2022-08-16 | 南京中科煜宸激光技术有限公司 | Balance mechanism for fine detection of large powder amount |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN115265729B (en) | 2023-10-03 |
| CN213729329U (en) | 2021-07-20 |
| CN112484824A (en) | 2021-03-12 |
| CN115265729A (en) | 2022-11-01 |
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