CN112013941A - Device and method for improving weighing reliability - Google Patents
Device and method for improving weighing reliability Download PDFInfo
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- CN112013941A CN112013941A CN201910455032.3A CN201910455032A CN112013941A CN 112013941 A CN112013941 A CN 112013941A CN 201910455032 A CN201910455032 A CN 201910455032A CN 112013941 A CN112013941 A CN 112013941A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/22—Weigh pans or other weighing receptacles; Weighing platforms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G21/00—Details of weighing apparatus
- G01G21/28—Frames, Housings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
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Abstract
The invention provides a device and a method for improving weighing reliability, which comprises the following steps: the light source is arranged on the side surface of the weighing equipment frame and used for projecting light beams to the outside of the weighing equipment; the image collector is arranged on the same side as the light source and is used for collecting a projection image of the light beam on a projection surface; and the image processor is used for identifying whether the projection image is incomplete or not, and further judging whether the weighed object is in lap joint with the ground or the frame of the weighing equipment or not. The device and the method for improving weighing reliability can improve the application range and reliability of exceeding detection in the weighing process.
Description
Technical Field
The invention relates to a weighing device, in particular to a device and a method for improving weighing reliability.
Background
In some applications, if the length and width of the object to be weighed exceeds the length of the load bearing surface of the weighing apparatus, a portion of the object to be weighed may protrude beyond the load bearing surface of the electronic scale. If the part of the object to be weighed, which extends out of the bearing surface of the electronic scale, overlaps with the ground or the table surface, a part of the weight of the object to be weighed falls out of the bearing surface of the electronic scale, so that the electronic scale is mistakenly used, and the weighing reliability is affected. In the weighing application process, the use error of the electronic scale caused by the overlapping can directly cause the error of the weighing result, and if the wrong weighing result cannot be found in time, the adverse effect is caused.
If the lapping condition can be detected in the weighing application process of the electronic scale, the weighing operation after the lapping condition exists can be avoided, the weight of the weighed object is ensured to completely fall on the bearing surface of the electronic scale, the adverse effect caused by the lapping condition is effectively avoided, and the weighing reliability of the electronic scale is improved.
In this regard, patent application No. CN102763120B discloses a scanner-scale system and method for peripheral monitoring of electronic scales. The system is characterized in that a light source, a light guide and a detector are arranged on the side edge of the weighing plate, when weighing is carried out, whether a light beam transmitted by the light source through the light guide can be received through the detector or not is judged, whether the part of a weighed object blocks a light path transmitted by the light beam or not is judged, and then whether the weighed object exceeds the size of the bearing surface of the electronic scale or not is judged.
The technical scheme can be used for detecting whether the part of the object to be weighed exceeds the bearing surface of the electronic scale. However, because the light source, the light guide and the detector are closely attached to the side edge of the weighing plate, the weighing plate can only detect objects with relatively regular shapes, and for objects to be weighed with irregular shapes, if the objects to be weighed have a certain bending radian, the part of the objects exceeding the bearing surface of the electronic scale just bypasses the detection range of the light path and is overlapped with the ground or the table top, the scheme cannot be applied, so that the reliability of the subsequent weighing result is influenced.
In addition, if the part of the object to be weighed, which extends out of the bearing surface of the electronic scale, shields the light path, but is not overlapped with the ground or the table top and the like, the false alarm of the scheme can be frequently caused. Especially, in the application occasions where the requirement for the precision of the weighing is not particularly high, such as the environments of supermarkets, factories and the like, the practicability and convenience of the over-detection scheme can be affected.
Disclosure of Invention
The invention aims to solve the technical problem of how to improve the application range and reliability of the exceeding detection in the weighing process.
In order to solve the above technical problem, the present invention provides a device for improving weighing reliability, comprising: the light source is arranged on the side surface of the weighing equipment frame and used for projecting light beams to the outside of the weighing equipment; the image collector is arranged on the same side as the light source and is used for collecting a projection image of the light beam on a projection surface; and the image processor is used for identifying whether the projection image is incomplete or not, and further judging whether the weighed object is in lap joint with the ground or the frame of the weighing equipment or not.
Preferably, when the light source is arranged on the side surface of the weighing equipment frame, the light source and the horizontal direction form a preset angle downward; the image collector collects the projection image of the light source on the supporting surface of the weighing equipment, and the arrangement position of the image collector is not higher than that of the light source.
Preferably, the projection surface is opposite to the light source emission direction; when the light source is arranged on the side surface or the top surface of the weighing equipment frame, a preset angle is formed between the light source and the horizontal direction, and the light source faces upwards; the image collector collects the projection image of the light source on the projection surface, and the arrangement position of the image collector is not lower than that of the light source.
Preferably, the light sources are respectively arranged on four sides of the weighing device frame.
Preferably, the device for improving weighing reliability further comprises a vertical fence which is over against the side face of the weighing equipment frame; the light source and the image collector are arranged on the side face of the weighing equipment frame and are horizontally arranged close to the ground.
Preferably, the light source is a laser generator.
Preferably, the image collector is a camera.
The invention also provides a method for improving weighing reliability, which is implemented by the device for improving weighing reliability and comprises the following steps: when the object to be weighed is detected to be placed on the weighing platform, the light source is started; shooting a projection image of the light beam on a projection surface through the image collector; identifying whether the projected image is defective; if so, judging that the weighed object is overlapped with the ground or the frame of the weighing equipment, otherwise, judging that the weighing is normal.
Preferably, when the light source is a laser generator, the identifying whether the projected image is defective includes: and identifying whether the ray line segments in the projection image are incomplete.
Preferably, after determining whether the weighing object is overlapped with the ground or the frame of the weighing device, the method further comprises the following steps: a weighing error signal is sent out by an indicating device.
The positive progress effects of the invention are as follows:
the light beam is projected to the outside of the weighing equipment through the light source, the image collector collects the projected image of the light beam on the projection surface, if the part of the weighed object exceeds the scale bearing surface and is in lap joint with the ground or the table top, the light beam line segment in the projected image or the light beam surface can be shielded, so that the projected image is incomplete, and whether lap joint exists between the weighed object and the ground or the table top can be detected. Because the light source projects light beams to the outside of the weighing device instead of forming the irradiation light path only along the side edge of the weighing device, the over-detection of the weighed object can be carried out in a larger range. For example, the method can be applied to the over-detection of irregular-shaped objects and whether the objects are lapped on the table top of the weighing equipment or the ground, thereby solving the problems of low applicability and insufficient reliability of the existing over-detection technology.
Certain terms are used throughout the description and claims to refer to particular system components. As one skilled in the art will appreciate, different usage objects may represent the same component by different names. Components that differ in name but not function are not distinguished herein and are intended to be within the scope of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for improving weighing reliability according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of the apparatus for improving weighing reliability of embodiment 1, in which laser generators and cameras are arranged on four sides;
FIG. 3 is a schematic structural diagram of an apparatus for improving weighing reliability according to embodiment 2 of the present invention;
FIG. 4 is a schematic structural diagram of an apparatus for improving weighing reliability according to embodiment 3 of the present invention;
fig. 5 is a flowchart of a method for improving weighing reliability according to an embodiment of the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
The device for improving weighing reliability of the embodiment 1 can be arranged in weighing equipment such as a platform scale, a counter scale, an electronic scale and a bar code scale, and is suitable for weighing daily articles in application occasions such as factories and supermarkets.
As shown in fig. 1, one side of a frame case of an electronic scale 1 includes a laser generator 11 and a camera 12. According to the application, the laser generator 11 and the camera 12 may be disposed on different sides of the electronic scale 1 to perform the over-detection for each direction of the electronic scale 1, as shown in fig. 2. The number and the form of the laser generators 11 are suitable for the light beams 13 emitted by the laser generators to cover the range to be detected, and the number of the cameras 12 is suitable for completely shooting the images projected by the light beams 13 on the projection surface.
As shown in fig. 1, the laser generator 11 is in a bar shape and is inclined downward at a predetermined angle with respect to the horizontal direction, so that the light beam 13 projected from the laser generator 11 forms a light ray on the table support surface 2 as a projection surface; by increasing the emission power of the laser generator 11, a light emitting surface can also be formed. The preset inclination angle can be adjusted according to actual use requirements, and if the condition that whether an object is lapped on the table support surface 2 exists or not needs to be detected in a large range, the angle can be set to be small, so that the light beam 13 emitted by the laser generator 11 is projected far, and the distance L from the side surface of the electronic scale to the position where the light beam 13 is projected on the table support surface 2 is increased; otherwise, the angle may be set larger, decreasing L.
The camera 12 and the laser generator 11 are arranged in the same direction, i.e., obliquely downward, to collect a projected image of the light beam 13 on the projection surface. In order to prevent the shooting range of the camera 12 from being blocked by the laser generator 11, the setting height of the laser generator 11 is not lower than that of the camera 12.
When the weighed object is partially overlapped on the ground or the table top of the electronic scale 1, for example, vegetables are weighed in a supermarket, vegetable leaves are overlapped on the table top supporting surface 2 outside the bearing surface of the electronic scale 1, the vegetable leaves touch the light path of the light beam 13 projected by the laser generator 11, so that the light beam 13 is blocked or the light beam 13 is partially blocked from being irradiated on the table top supporting surface 2, and a incomplete projection image is formed on the table top supporting surface 2.
The electronic scale 1 further includes an image processor (not shown in the figure) for identifying the projection image captured by the camera 12, determining whether the projection image is incomplete, i.e. whether the light ray therein is intercepted, and further determining whether the object to be weighed is overlapped with the frame of the electronic scale 1 or the table top supporting surface 2. Whether the projected image is defective or not can be identified by an edge detection algorithm. Due to the relatively high brightness of the light beam 13, the light rays impinging on the table support surface 2 are the edges, where the grey scale variations are most pronounced on the projected image. And then whether the pixel point that constitutes this edge is continuous through detecting, can judge whether light beam 13 is blockked by the object of weighing to judge whether the object of weighing exists the condition of overlap joint to electronic scale 1 frame or table support surface 2.
In the apparatus for improving weighing reliability of embodiment 1, the light beam emitted by the laser generator irradiates the outside of the electronic scale, and determines whether the article is overlapped by means of image recognition, so that the apparatus has a wider detection range. On one hand, the electronic scale frame detecting device can be suitable for detecting exceeding and lapping various types of articles, on the other hand, the detection range can be expanded from the peripheral range of the electronic scale frame to supporting platforms such as a desktop or the ground where the electronic scale is placed, and therefore the reliability of the weighing result is improved.
Example 2
Compared with the device for improving weighing reliability of embodiment 1, in embodiment 2, as shown in fig. 3, a laser generator 11 disposed on a side surface of a frame of the electronic scale 1 is inclined upward at a predetermined angle from a horizontal direction, and a camera 12 is disposed at a height higher than the laser generator 11. The projection surface of this embodiment is a panel 142 extending from the frame of the electronic scale 1 through a connecting member 141, and the panel 142 faces the emission direction of the laser generator 11 to form a projection surface. In order to prevent the portion of the object to be weighed exceeding the load bearing surface of the electronic scale from being caught by the coupling member 141 and the panel 142, the length of the coupling member 141 may be set relatively long.
The light beam 13 emitted from the laser generator 11 is projected on the panel 14, and if a part of the object to be weighed exceeds the bearing range of the platform of the electronic balance 1, touches the light beam 13, and is projected on the panel 14 as a projection surface, the image processor recognizes that the light ray of the projected image has a defect.
Since the weighing sensitivity of the middle position of the electronic scale 1 is usually higher than that of the edge of the electronic scale 1, the electronic scale 1 gives an alarm in an acousto-optic manner through a corresponding indicating device, so that an operator can know that the weighed object partially exceeds the bearing range of the electronic scale 1 due to the fact that the weighed object is not placed at the center position of the electronic scale 1. Thus, even if the object to be weighed does not overlap the frame of the electronic scale 1 or the table support surface 2, a slight weight measurement error may occur. By re-aligning the object to be weighed to the middle position of the weighing platform of the electronic scale 1, a relatively more accurate weighing result can be obtained.
It can be understood by those skilled in the art that if the laser generator 11 is disposed on the top surface of the electronic scale 1 and the orientation thereof is set to be inclined upward at a predetermined angle with respect to the horizontal direction, and the camera is disposed at a position on the side or top surface of the electronic scale 1 that does not affect the image acquisition, the above-mentioned over-detection and the technical effects of detecting whether the object to be weighed is placed at the middle position of the scale pan can also be achieved, which also fall within the scope of the present invention.
Example 3
As shown in FIG. 4, the apparatus for improving weighing reliability of the present embodiment is applied to an electronic scale 1, and includes a laser generator 11 and a camera 12 disposed at one side of a frame housing of the electronic scale 1, and a vertical rail 15 facing the side of the frame of the weighing device as a projection surface. If the laser generator 11 and the camera 12 are disposed at four sides of the electronic scale 1, four vertical rails 15 are respectively aligned with the four sides of the electronic scale 1, thereby forming a vertical frame surrounding the electronic scale 1.
The laser generator 11 and the camera 12 are arranged close to the ground and are oriented in a horizontal direction. Since the light beam 13 generated by the laser generator 11 also travels in a horizontal direction close to the ground, the height of the vertical bars 15 can be set low, only the projected light line segment of the light beam 13 needs to be displayed.
In the present embodiment 3, since the height of the laser generator 11 is set to be horizontally arranged close to the ground, it is possible to more accurately detect whether the excess portion of the object to be weighed actually overlaps with the table support surface 2. If the laser generator 11 is located higher, the excess portion of the object to be weighed, although touching the path of the light beam 13 projected by the laser generator 11, may not actually overlap the table support surface 2, which would still cause false overlap.
Simultaneously, to the narrower electronic scale of frame side width, arrange and establish a vertical column in addition as the plane of projection of light beam 13 through pasting laser generator 11 and camera ground level, can also avoid laser generator 11 to shelter from the shooting scope of camera 12 to and the problem of laser generator 11 detection range undersize.
Example 4
The method for improving weighing reliability of example 4 can be implemented by the apparatus for improving weighing reliability of examples 1 to 3. As shown in fig. 5, a method of improving weighing reliability may include:
step S101, the laser generator 11 is turned on.
When an object to be weighed is placed on a scale pan of the electronic scale and a weighing sensor of the electronic scale detects pressure, the laser generator 11 is started to perform object exceeding and lap joint detection.
In step S102, the projection image of the light beam 13 on the projection surface is captured by the camera 12.
The camera 12 and the laser generator 11 may be positioned at different locations or in different orientations, as desired for use. Referring to embodiment 1, if the camera 12 and the laser generator 11 face downward at a predetermined angle with respect to the horizontal direction, the projection surface is a supporting surface of the electronic scale 1; referring to embodiment 2, if the camera 12 and the laser generator 11 are oriented upward at a predetermined angle with respect to the horizontal direction, the projection surface is an additional panel 14; referring to embodiment 3, if the camera 12 and the laser generator 11 are horizontally disposed close to the ground, the projection plane is an additional vertical column.
And step S103, identifying whether the projection image is incomplete.
Whether the ray line segments in the projection image are truncated or not can be identified through an image edge detection algorithm. If yes, go to step S104; otherwise, the step S105 is entered to finish the weighing of the object normally.
And step S104, sending out a weighing error signal.
The indicating device can be an acousto-optic warning device and sends a weighing error signal to an operator through an acousto-optic signal.
And step S105, judging whether the weighed object is placed or not within preset time.
If the operator picks up the weighed object and puts the weighed object again, the electronic scale sensor detects the pressure change on the scale pan, namely, the step S101 is returned to perform a new exceeding detection again; if the operator does not move the object to be weighed within the preset time, the default is that the operator permits a small amount of weighing errors, and the step S106 is entered to finish weighing.
And S106, the electronic scale finishes weighing the weighed object and returns to the step S101 to prepare for next weighing.
In a supermarket weighing environment, after weighing of the symmetrical weight body is completed, a weighing result can be output to a display and simultaneously output to a portable printer, and a bar code label is printed.
Although the idea of the invention has been described by means of the above specific embodiments, it will be appreciated by those skilled in the art that further modifications are conceivable on the basis of the teaching of the invention, for example by combining features of the embodiments with each other and/or interchanging functional units between the embodiments. Therefore, all fall within the scope of protection of the present application.
While the invention has been described with reference to a number of specific embodiments, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the invention, and various changes in and substitutions of equivalents may be made without departing from the spirit of the invention. Therefore, changes and modifications to the above-described embodiments within the spirit and scope of the present invention will fall within the scope of the claims of the present application.
Claims (10)
1. An apparatus for improving weighing reliability, comprising:
the light source is arranged on the side surface of the weighing equipment frame and used for projecting light beams to the outside of the weighing equipment;
the image collector is arranged on the same side as the light source and is used for collecting a projection image of the light beam on a projection surface;
and the image processor is used for identifying whether the projection image is incomplete or not, and further judging whether the weighed object is in lap joint with the ground or the frame of the weighing equipment or not.
2. The apparatus for improving weighing reliability of claim 1,
when the light source is arranged on the side surface of the weighing equipment frame, the light source and the horizontal direction form a preset angle and face downwards;
the image collector collects the projection image of the light source on the supporting surface of the weighing equipment, and the arrangement position of the image collector is not higher than that of the light source.
3. The apparatus for improving weighing reliability of claim 1, wherein said projection surface faces the emitting direction of said light source;
when the light source is arranged on the side surface or the top surface of the weighing equipment frame, a preset angle is formed between the light source and the horizontal direction, and the light source faces upwards;
the image collector collects the projection image of the light source on the projection surface, and the arrangement position of the image collector is not lower than that of the light source.
4. The apparatus for improving weighing reliability of claim 1, wherein said light sources are respectively disposed at four sides of said weighing device frame.
5. The apparatus for improving weighing reliability of claim 1,
the vertical fence is opposite to the side surface of the weighing equipment frame;
the light source and the image collector are arranged on the side face of the weighing equipment frame and are horizontally arranged close to the ground.
6. The apparatus for improving weighing reliability of claim 1, wherein the light source is a laser generator.
7. The device for improving weighing reliability of claim 1, wherein the image collector is a camera.
8. A method for improving weighing reliability, implemented by the apparatus for improving weighing reliability of any one of claims 1 to 7, comprising:
when the object to be weighed is detected to be placed on the weighing platform, the light source is started;
shooting a projection image of the light beam on a projection surface through the image collector;
identifying whether the projected image is defective; if so, judging that the weighed object is overlapped with the ground or the frame of the weighing equipment, otherwise, judging that the weighing is normal.
9. The method for improving weighing reliability of claim 8, wherein when the light source is a laser generator, the identifying whether the projected image is defective comprises: and identifying whether the ray line segments in the projection image are incomplete.
10. The method for improving weighing reliability of claim 8, after determining whether the weighing object is overlapped with the ground or the frame of the weighing apparatus, further comprising: a weighing error signal is sent out by an indicating device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910455032.3A CN112013941A (en) | 2019-05-29 | 2019-05-29 | Device and method for improving weighing reliability |
| PCT/CN2020/091605 WO2020238757A1 (en) | 2019-05-29 | 2020-05-21 | Device and method for improving weighing reliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910455032.3A CN112013941A (en) | 2019-05-29 | 2019-05-29 | Device and method for improving weighing reliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112013941A true CN112013941A (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910455032.3A Pending CN112013941A (en) | 2019-05-29 | 2019-05-29 | Device and method for improving weighing reliability |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112013941A (en) |
| WO (1) | WO2020238757A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5588153B2 (en) * | 2009-11-17 | 2014-09-10 | 新光電子株式会社 | Dimensional weight measuring apparatus and dimensional weight measuring method |
| CN108656150A (en) * | 2017-03-27 | 2018-10-16 | 张舒怡 | A kind of sensor of robot detection obstacle |
| CN108663688B (en) * | 2017-03-27 | 2024-06-21 | 张舒怡 | Sensor for detecting obstacle of moving object |
| CN207816432U (en) * | 2018-02-26 | 2018-09-04 | 韶关中衡称重设备有限公司 | A kind of truck scale using pressure alarm |
| CN208383271U (en) * | 2018-06-14 | 2019-01-15 | 上海东普信息科技有限公司 | A kind of unmanned weight bridge weighing, print system |
| CN209841170U (en) * | 2019-05-29 | 2019-12-24 | 梅特勒-托利多(常州)测量技术有限公司 | Device for improving weighing reliability |
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2019
- 2019-05-29 CN CN201910455032.3A patent/CN112013941A/en active Pending
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- 2020-05-21 WO PCT/CN2020/091605 patent/WO2020238757A1/en active Application Filing
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| WO2020238757A1 (en) | 2020-12-03 |
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