CN114136985B - Flaw detection system and method for paper - Google Patents
Flaw detection system and method for paper Download PDFInfo
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- CN114136985B CN114136985B CN202111396405.8A CN202111396405A CN114136985B CN 114136985 B CN114136985 B CN 114136985B CN 202111396405 A CN202111396405 A CN 202111396405A CN 114136985 B CN114136985 B CN 114136985B
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- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 19
- 238000007664 blowing Methods 0.000 claims description 14
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
- G01N21/8914—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles characterised by the material examined
- G01N2021/8917—Paper, also ondulated
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Abstract
The invention discloses a flaw detection system and a flaw detection method for paper. Comprising the following steps: the first-stage detection device and the second-stage detection device are fixedly arranged on the transmission device, and the transmission device is used for conveying paper to be detected; the first-stage detection device is used for detecting the completely overlapped double sheets of paper to be detected on the transmission device; the secondary detection device is used for detecting the defective paper of the paper to be detected on the transmission device, and the defective paper comprises non-fully overlapped double sheets. The embodiment of the invention can realize the double-sheet detection function, thereby avoiding the problem of defect missing detection caused by double sheets.
Description
Technical Field
The embodiment of the invention relates to the technical field of double-sheet detection, in particular to a flaw detection system and method for paper.
Background
With the continuous development of printing technology, the requirements of the printing industry on the quality of printed products are increasing, and quality control is even so fine that a "defect product" is not allowed to flow into downstream markets, especially bar code defects or trademark defects on circulated products, and the like. On the premise of not considering special conditions, the more advanced visual inspection equipment on the market can meet the requirement of not putting any defect missed inspection.
However, there is a special case where visual inspection cannot achieve defect detection: double sheets. Once the to-be-detected product passes through the visual camera in a fully overlapped double-sheet mode, the camera can only detect the upper product, if the lower product has a larger defect, the common defect is missed due to light weight, and the quality accident is caused due to heavy weight.
Disclosure of Invention
The invention provides a flaw detection system for paper, which is used for realizing a double-sheet detection function and avoiding the problem of defect missing detection caused by double sheets.
In a first aspect, an embodiment of the present invention provides a flaw detection system for paper, including:
the first-stage detection device and the second-stage detection device are fixedly arranged on the transmission device, and the transmission device is used for conveying paper to be detected;
the first-stage detection device is used for detecting the completely overlapped double sheets of paper to be detected on the transmission device;
the secondary detection device is used for detecting the defective paper of the paper to be detected on the transmission device, and the defective paper comprises non-fully overlapped double sheets.
In a second aspect, an embodiment of the present invention further provides a method for detecting flaws in paper, where the method includes:
the method comprises the steps that a first-stage detection device is used for detecting the paper to be detected on the transmission device in a full-overlapping double manner;
and detecting the defective paper on the paper to be detected on the transmission device through a secondary detection device, wherein the defective paper comprises non-fully overlapped double sheets.
The flaw detection system of the paper sheet of the present invention includes: the first-stage detection device and the second-stage detection device are fixedly arranged on the transmission device. The first-stage detection device is used for detecting the paper to be detected on the transmission device in a fully overlapped double mode, and the second-stage detection device is used for detecting the paper to be detected on the transmission device in a flaw paper mode, wherein the flaw paper comprises non-fully overlapped double sheets. The double-sheet detection function is realized, so that the defect missing detection problem caused by double sheets is avoided.
Drawings
Fig. 1 is a schematic structural diagram of a flaw detection system for paper according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of a specific structure of a flaw detection system for paper according to a first embodiment of the present invention;
FIG. 3 is a flowchart of a method for detecting flaws in paper according to a second embodiment of the present invention;
fig. 4a is a schematic diagram of a sheet of paper collected in the flaw detection method according to the second embodiment of the present invention in a double-sheet fully overlapped state;
fig. 4b is a schematic diagram of a sheet of paper collected in the flaw detection method according to the second embodiment of the present invention in a double-sheet misalignment overlapping state;
fig. 4c is a schematic diagram of a state of warping the front end of a piece of paper collected in the flaw detection method of a piece of paper according to the second embodiment of the present invention;
fig. 4d is a schematic diagram of a state of warping the rear end of a piece of paper collected in the flaw detection method of a piece of paper according to the second embodiment of the present invention;
fig. 4e is a schematic diagram of a sheet collected in the flaw detection method of a sheet according to the second embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a flaw detection system for paper according to an embodiment of the present invention, and the embodiment is applicable to the flaw detection of paper.
As shown in fig. 1, a flaw detection system for paper according to an embodiment of the present invention includes: the first-stage detection device 12 and the second-stage detection device 13 are fixedly arranged on the transmission device 11, and the transmission device 11 is used for conveying paper to be tested.
In this embodiment, the transmission device may be a device having a transmission function such as a conveyor belt. The transmission device conveys the paper to be detected through a first-stage detection device and a second-stage detection device which are fixedly arranged on the transmission device in sequence, wherein the first-stage detection device is used for detecting the fully overlapped double sheets in the paper to be detected, and the second-stage detection device is used for detecting the flaw paper which comprises the non-fully overlapped double sheets in the paper to be detected.
The transmission device can be driven by a motor to move and is used for conveying paper to be detected to sequentially pass through a first-stage detection device and a second-stage detection device which are fixedly arranged on the transmission device, the paper to be detected can pass through the first-stage detection device and then pass through the second-stage detection device, and the paper to be detected can also pass through the second-stage detection device and then pass through the first-stage detection device, so that the paper to be detected is determined by the positions of the first-stage detection device and the second-stage detection device which are fixedly arranged on the transmission device. The fixing positions of the two can be just above the transmission device, the first-stage detection device can be behind the first-stage detection device and the second-stage detection device can be behind the first-stage detection device. In this embodiment, the first-stage detecting device is behind the first-stage detecting device, that is, the paper to be detected passes through the first-stage detecting device and then passes through the second-stage detecting device.
The first-stage detecting device 12 is used for detecting the completely overlapped double sheets of paper to be detected on the driving device 11.
It should be noted that the completely overlapped double sheets refer to two sheets to be measured which are completely overlapped. The detection of the fully overlapped double sheets is performed by a primary detection device.
The secondary detection device 13 is used for detecting the defective paper on the transmission device 11, and the defective paper comprises non-fully overlapped double sheets.
It should be noted that the defective sheets include non-fully overlapped double sheets, for example, double sheets overlapped in a staggered manner, sheets with the front end turned up, sheets with the rear end turned up, and the like.
After the first-stage detection device detects the fully overlapped double sheets, the transmission device continuously transmits the paper to be detected to pass through the second-stage detection device, and the second-stage detection device detects the defective paper comprising the non-fully overlapped double sheets.
Wherein the primary detection device 12 comprises: an ultrasonic sensor and a first control module;
in this embodiment, the first control module may be a PLC control module, for receiving sensing signals, data calculation, communication interaction, data storage, and the like.
Further, the ultrasonic sensor is configured to perform single Zhang He double-sheet state detection on the paper to be detected on the transmission device 11, and feed back a signal value generated in the detection process to the first control module.
For example, the ultrasonic sensor performs state detection of one sheet Zhang He and two sheets of paper to be detected, and when the ultrasonic sensor does not detect the paper, the signal value generated by the ultrasonic sensor may be 0; when the ultrasonic sensor detects that the paper is a single sheet, the signal value generated by the ultrasonic sensor may be 1; when the ultrasonic sensor detects that the paper is double, the signal value generated by the ultrasonic sensor can be 2, and the ultrasonic sensor feeds back the signal value generated in the detection process to the first control module.
And the first control module is used for judging whether the paper to be tested is completely overlapped double according to the received signal values.
Specifically, if the signal value received by the first control module is 2, judging that the paper to be tested is completely overlapped double paper; if the signal value received by the first control module is not 2, judging that the paper to be tested is incompletely overlapped double paper.
Further, the ultrasonic sensor includes: the single detection signal line and the double detection signal lines are connected with the first control module.
In the actual operation process, since the ultrasonic sensor is very sensitive, false alarm is easy to generate, which is also one reason that the ultrasonic sensor is difficult to be popularized. In order to prevent the problem of frequent machine shutdown caused by false alarm of the ultrasonic sensor, the embodiment of the invention combines and uses a single detection signal and a double detection signal of the ultrasonic sensor, which are connected to the first control module. When the first control module receives the single signal and then switches to the state of the double signal, the situation is probably caused by Shan Zhangqiao edges, and the situation is judged to be false alarm, so that the situation of false alarm is greatly reduced.
Wherein, ultrasonic sensor specifically is used for:
when the paper to be detected transmitted on the transmission device 11 does not enter the primary detection area, feeding back a set original signal value to the first control module;
the primary detection area refers to a range area in which the primary detection device 12 can detect paper. Specifically, the set original signal value may be 0. When the paper to be detected transmitted on the transmission device 11 does not enter the primary detection area, the ultrasonic sensor does not detect the paper to be detected, the generated signal value is 0, the signal value 0 at the moment is set as an original signal value, and the original signal value is fed back to the first control module.
When the paper to be detected on the transmission device 11 enters the primary detection area and the paper to be detected is detected to be a single sheet, a single sheet signal value is generated and fed back to the first control module through a single sheet detection signal line.
In an exemplary manner, in an actual operation process, after the paper to be detected on the transmission device enters the first-stage detection area, the ultrasonic sensor detects the paper to be detected, when the paper to be detected is detected to be a single sheet, a single signal value is generated, the single signal value can be 1, and the ultrasonic sensor feeds back the single Zhang Xinhao value 1 to the first control module through the single detection signal line.
When the paper to be detected on the transmission device 11 enters the primary detection area and the paper to be detected is detected to be double, a double-sheet signal value is generated and fed back to the first control module through the double-sheet detection signal line.
In an actual operation process, after the paper to be detected on the transmission device enters the first-stage detection area, the ultrasonic sensor detects the paper to be detected, when the paper to be detected is detected to be double, a double-sheet signal value is generated, the double-sheet signal value can be 2, and the ultrasonic sensor feeds back the double-sheet signal value 2 to the first control module through the double-sheet detection signal line.
Wherein the single signal value and the double signal value are marked as non-original signal values.
It is to be appreciated that non-original signal values refer to signal values that differ from the original signal values (e.g., may be 0). For example, a single signal value may be 1 and a double signal value may be 2, with both signal values 1 and 2 noted as non-original signal values.
Further, the first control module specifically includes:
and the information determining unit is used for receiving the signal values fed back by the ultrasonic sensor and determining a state signal sequence relative to the paper to be detected based on the signal values.
The sequence of status signals may be, for example, a sequence of different signal values generated by the ultrasonic sensor detecting different states of the paper. For example, the ultrasonic sensor detects that the sheet is from no (at which time the signal value generated by the ultrasonic sensor may be 0) to one sheet (at which time the signal value generated by the ultrasonic sensor may be 1) to two sheets (at which time the signal value generated by the ultrasonic sensor may be 2), and then changes from two sheets to a state of one Zhang Zai to no, at which time the state signal sequence may be 01210.
And the information judging unit is used for determining that the paper to be detected is double-sheet full overlap when the state signal sequence accords with the set double-sheet full overlap condition.
It should be explained that the state signal sequence corresponding to the set double-sheet full overlap condition may be 020. When the state signal sequence is 020, the paper to be tested is determined to be double-sheet full overlapping.
Further, the information determining unit is specifically configured to:
and continuously receiving the signal value fed back by the ultrasonic sensor.
In the actual operation process, the information determining unit continuously receives the signal value fed back by the ultrasonic sensor. When the paper to be detected is not detected, the signal value fed back by the ultrasonic sensor is continuously 0 by the information determining unit; when the occurrence of the paper to be detected is detected, the signal value fed back by the ultrasonic sensor is 1 (single sheet) or 2 (double sheets) by the information determining unit; when the disappearance of the paper to be detected is detected until the appearance of the next paper to be detected, the signal value fed back by the ultrasonic sensor received by the information determining unit is continuously 0 again.
If the received previous signal value is the original signal value and the current signal value is the non-original signal value, sequentially caching the received signal values from the previous signal value until the original signal value is received again.
It should be noted that, if the previous signal value received by the information determining unit is the original signal value (signal value 0), and the current signal value is the non-original signal value (signal value 1 or 2), the received signal values are sequentially buffered from the previous signal value until the original signal value (signal value 0) is received again, that is, the signal values of various states of the paper to be detected occurring in one detection process are collected.
And extracting each cached signal value of the cache as a state signal sequence of the paper to be tested.
Specifically, each buffer signal value received by the information determining unit, that is, the signal value of all states of the paper to be detected, which appears in one detection, is used as a state signal sequence of the paper to be detected.
Further, the information determination unit is specifically configured to:
searching a preset paper state sequence table.
In this embodiment, the preset paper state sequence table is shown in table 1.
TABLE 1
| Paper state | Status signal sequence |
| Double sheets are fully overlapped | 020 |
| Double offset overlapping | 01210 |
| Paper front end warping | 0210 |
| Paper back end warping | 0120 |
| Normal sheet | 010 |
And if the state signal sequence is matched with the double-sheet full-overlap sequence in the paper state sequence table, determining that the paper to be detected is double-sheet full-overlap.
Further, the primary detection device 12 is further configured to:
when the paper to be detected is determined to be double-sheet full overlapping, the machine table of the transmission device is controlled to stop transmission, so that an operator can perform detection operation on the operation paper.
When the paper to be tested passes through the ultrasonic sensor, the ultrasonic sensor transmits a state signal when the paper passes through to the first control module, and if the first control module detects that the double-sheet state still exists, the first control module controls the machine of the transmission device to stop so as to manually detect the double-sheet products.
Wherein the secondary detection device 13 comprises:
the reflective electric eye, the encoder and the second control device are connected with the second control device.
The reflection electric eye is used for capturing the entering time and the leaving time of the paper to be detected relative to the secondary detection area and sending feedback to the second control device;
the reflective electric eye may be a device such as a photoelectric sensor having a function of judging whether or not an object appears. The secondary detection area refers to a range area in which the secondary detection device 13 can perform sheet detection.
When the foremost end of the paper to be detected enters the secondary detection area, the reflective electric eye is triggered, the reflective electric eye captures the entering moment at the moment, and when the rearmost end of the paper to be detected leaves the secondary detection area, the reflective electric eye captures the exiting moment at the moment. The reflected electric eye captures the entering time and the leaving time of the paper to be detected and sends feedback to the second control device.
The second control module is used for acquiring pulse signals of the encoder from the entering time to the exiting time through control of the encoder, and judging whether the paper to be detected is defective paper or not through the pulse signals.
In this embodiment, the second control device may be a board card, for receiving the sensing signal, data calculation, communication interaction, data storage, and the like.
When the forefront end of the paper to be tested triggers the reflective electric eye, the second control module controls the encoder to start accumulating pulses, and when the rearmost end of the paper to be tested leaves the reflective electric eye, the second control module controls the encoder to end accumulating pulses. And acquiring a pulse signal of the encoder from the entering time to the exiting time, and judging whether the paper to be detected is defective paper or not through the pulse signal.
Further, the second control module includes:
the acquisition control unit is used for controlling the encoder to acquire pulse signals from the entering moment to the leaving moment relative to the paper to be detected and acquiring each pulse signal;
and the flaw judging unit is used for judging the flaw paper according to the pulse signals and combining the entering time and the leaving time.
Further, the flaw determination unit is specifically configured to:
and according to the entering time, the exiting time and each pulse signal, combining a given length determination formula to determine the paper length of the paper to be tested.
It should be noted that, the given length determination formula may be:
wherein L is the length of the product to be solved, the unit is mm, D is the diameter of the encoder, the unit is mm, lambda is the pulse frequency, eta is the resolution of the encoder, T 0 To enter the moment, T 1 Is the departure time.
And when the paper length is not matched with the given standard length, determining that the paper to be detected is defective paper.
Specifically, the standard length is the actual length of the paper itself in mm. And when the calculated paper length of the paper to be detected is not matched with the given standard length, determining that the paper to be detected is defective paper.
Further, the secondary detection device 13 further includes: blowing and waste-kicking device.
The blowing and waste-kicking device can be a device with a removing function such as a blower. In this embodiment, the blowing and waste kicking device is specifically used for removing defective paper in the paper to be tested.
Correspondingly, the secondary detection device 13 is further configured to:
when the paper to be detected is detected to be defective, the blowing and waste kicking device is controlled to reject the paper to be detected.
Specifically, when the paper to be detected is detected to be defective paper (including double-sheet staggered overlapped, front-end lifted paper and rear-end lifted paper), the blowing waste kicking device is controlled to reject the paper to be detected (including double-sheet staggered overlapped double-sheet, single paper of front-end lifted paper and single paper of rear-end lifted paper).
According to the technical scheme, the first-stage detection device is used for detecting the paper to be detected on the transmission device in a fully overlapped mode, the second-stage detection device is used for detecting the defective paper on the transmission device, the double-sheet detection function is achieved, and therefore the defect missing detection problem caused by double sheets is avoided.
As an exemplary description of the present embodiment, fig. 2 is a schematic diagram of a specific structure of a flaw detection system for paper according to the first embodiment of the present invention, and the present embodiment is applicable to a case of flaw detection for paper.
As shown in fig. 2, a flaw detection system for paper according to an embodiment of the present invention includes: a primary detection device 12 and a secondary detection device 13 which are fixedly arranged on the transmission device 11. Wherein the primary detection device 12 comprises: the ultrasonic sensor and the first control module are specifically a PLC control module, and the ultrasonic sensor is connected with the PLC control module through a single detection signal line and a double detection signal line. The secondary detection device 13 includes: the device comprises a reflecting electric eye, an encoder, a second control device and a blowing and waste-kicking device, wherein the second control device is specifically a board card, and the devices are connected through IO lines.
Flaw detection of paper is realized in two sections: the first-stage detection device 12 detects fully overlapped double-sheet products by an ultrasonic sensor, and controls the transmission device to stop running when the internal algorithm of the first control module determines double sheets again; the secondary detection device 13 detects products which are not completely overlapped, and if the products are judged to be double, the products are removed by the blowing waste-kicking device.
Example two
Fig. 3 is a flowchart of a paper defect detection method according to a second embodiment of the present invention, where the present embodiment is applicable to a paper defect detection situation, and the method may be performed by the paper defect detection system provided in the above embodiment.
As shown in fig. 3, the method specifically includes the following steps:
s101, detecting the paper to be detected on the transmission device through a first-stage detection device in a full-overlapping double mode.
The transmission device is a device for conveying paper to be detected to detect the paper, and the primary detection device is fixedly arranged on the transmission device and is used for detecting the completely overlapped double paper. An ultrasonic sensor and a first control module are arranged in the primary detection device, and the ultrasonic sensor is connected with the first control module through a single detection signal line and a double detection signal line. When the ultrasonic sensor does not detect the occurrence of paper, the ultrasonic sensor feeds back a signal value 0 to the first control module, when the ultrasonic sensor detects that the paper to be detected is a single sheet, the ultrasonic sensor feeds back a signal value 1 to the first control module, and when the ultrasonic sensor detects that the paper to be detected is a double sheet, the ultrasonic sensor feeds back a signal value 2 to the first control module, and a state signal sequence of the paper to be detected is determined based on each signal value. When the state signal sequence of the paper to be detected is 020, the paper to be detected is judged to be completely overlapped double sheets. When the paper to be detected is determined to be double-sheet full overlapping, the machine table of the transmission device is controlled to stop transmission, so that an operator can perform detection operation on the operation paper.
S102, detecting defective paper on the paper to be detected on the transmission device through a secondary detection device. Wherein the defective paper includes non-perfect overlapping double sheets.
In this embodiment, the secondary detection device is fixedly arranged on the transmission device, and detects defective paper on the paper to be detected. The second-level detection device is internally provided with a reflective electric eye, an encoder, a second control module and a blowing waste-kicking device, and the reflective electric eye and the encoder are connected with the second control device. Starting from the condition that the forefront end of the paper to be detected is detected by the reflecting electric eye, pulse accumulation is carried out by the encoder, when the last section of the paper to be detected leaves the reflecting electric eye, pulse accumulation of the encoder is finished, the reflecting electric eye sends feedback to the second control device to feed back the entering moment and the leaving moment of the paper to be detected, the second control module calculates the paper length of the paper to be detected through a pulse signal accumulated by the encoder in combination with a given length determining formula, the paper length is matched with the standard length of the given paper, whether the paper to be detected is defective paper or not is judged, and if so, the paper to be detected is rejected by the blowing waste kicking device.
According to the technical scheme, the first-stage detection device is used for detecting the paper to be detected on the transmission device in a fully overlapped mode, the second-stage detection device is used for detecting the defective paper on the transmission device, the double-sheet detection function is achieved, and therefore the defect missing detection problem caused by double sheets is avoided.
As an exemplary description of the present embodiment, the present embodiment divides the state of the paper to be detected into 5 kinds, and performs different operations for the 5 kinds of states, respectively.
Fig. 4a is a schematic diagram of a paper sheet in a double-sheet fully overlapped state acquired by the flaw detection method for paper sheets according to the second embodiment of the present invention. As shown in fig. 4a, when the ultrasonic sensor detects that the state of the sheets is that the sheets are completely overlapped, and the state signal sequence at this time is 020, the machine of the transmission device 11 is controlled to stop transmission, so that an operator performs detection operation on the operation sheets.
Fig. 4b is a schematic diagram of a double-sheet misalignment overlapping state of the collected paper in the flaw detection method of the paper provided in the second embodiment of the present invention. As shown in fig. 4b, when the ultrasonic sensor detects that the state of the paper is double-sheet staggered and overlapped, the state signal sequence at the moment is 01210, the detection is not stopped, and the blowing waste kicking device is controlled to reject the paper to be detected.
Fig. 4c is a schematic diagram of a state of warping the front end of a piece of paper collected in the flaw detection method of a piece of paper according to the second embodiment of the present invention. As shown in fig. 4c, when the ultrasonic sensor detects that the state of the paper is that the front end of the paper is warped, the state signal sequence at the moment is 0210, and the false alarm is determined, and the blowing and waste kicking device is controlled to reject the paper to be detected.
Fig. 4d is a schematic diagram of a state of warping the rear end of a piece of paper collected in the flaw detection method of a piece of paper according to the second embodiment of the present invention. As shown in fig. 4d, when the ultrasonic sensor detects that the state of the paper is that the rear end of the paper is warped, the state signal sequence at the moment is 0120, the false alarm is determined, and the blowing and waste kicking device is controlled to reject the paper to be detected.
Fig. 4e is a schematic diagram of a sheet collected in the flaw detection method of a sheet according to the second embodiment of the present invention. As shown in fig. 4e, when the ultrasonic sensor detects that the state of the paper is a normal sheet, the paper is not stopped and the paper is normally fed.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A flaw detection system for paper, comprising: the first-stage detection device and the second-stage detection device are fixedly arranged on the transmission device, and the transmission device is used for conveying paper to be detected;
the first-stage detection device is used for detecting the completely overlapped double sheets of paper to be detected on the transmission device;
the secondary detection device is used for detecting defective paper on the paper to be detected on the transmission device, and the defective paper comprises non-fully overlapped double sheets;
the primary detection device includes: an ultrasonic sensor and a first control module;
the ultrasonic sensor is used for detecting the states of the single sheet Zhang He and the double sheet of paper to be detected on the transmission device and feeding back a signal value generated in the detection process to the first control module;
the first control module is used for judging whether the paper to be tested is completely overlapped double according to the received signal values;
the secondary detection device includes:
the reflective electric eye and the encoder are connected with the second control module;
the reflective electric eye is used for capturing the entering time and the leaving time of the paper to be detected relative to the secondary detection area and sending feedback to the second control module;
the second control module is used for acquiring a pulse signal of the encoder from the entering moment to the leaving moment through control of the encoder, and judging whether the paper to be detected is defective paper or not through the pulse signal;
the second control module includes:
the acquisition control unit is used for controlling the encoder to acquire pulse signals from the entering moment to the leaving moment relative to the paper to be detected and acquiring each pulse signal;
the flaw judging unit is used for judging flaw paper on the paper to be tested according to the pulse signals and combining the entering moment and the leaving moment;
the flaw determination unit is specifically configured to:
according to the entering time, the leaving time and each pulse signal, a given length determining formula is combined to determine the paper length of the paper to be detected;
when the paper length is not matched with the given standard length, determining that the paper to be detected is defective paper;
the secondary detection device further includes: blowing and waste-kicking device;
correspondingly, the secondary detection device is also used for:
when the paper to be detected is detected to be defective, the blowing and waste kicking device is controlled to reject the paper to be detected.
2. The system of claim 1, wherein the ultrasonic sensor comprises: the single detection signal line and the double detection signal lines are connected with the first control module;
the ultrasonic sensor is specifically used for:
when the paper to be detected transmitted on the transmission device does not enter the primary detection area, feeding back a set original signal value to the first control module;
when the paper to be detected on the transmission device enters a primary detection area and the paper to be detected is detected to be a single sheet, a single sheet signal value is generated and fed back to the first control module through a single sheet detection signal line;
when the paper to be detected on the transmission device enters a primary detection area and the paper to be detected is detected to be double, generating double signal values and feeding the double signal values back to the first control module through double detection signal lines;
wherein the single signal value and the double signal value are marked as non-original signal values.
3. The system according to claim 2, wherein the first control module comprises in particular:
the information determining unit is used for receiving the signal values fed back by the ultrasonic sensor and determining a state signal sequence relative to the paper to be detected based on the signal values;
and the information judging unit is used for determining that the paper to be detected is double-sheet full overlap when the state signal sequence accords with the set double-sheet full overlap condition.
4. A system according to claim 3, characterized in that the information determining unit is adapted to:
continuously receiving a signal value fed back by the ultrasonic sensor;
if the received previous signal value is the original signal value and the current signal value is the non-original signal value, sequentially caching the received signal values from the previous signal value until the original signal value is received again;
and extracting each cached signal value of the cache as a state signal sequence of the paper to be tested.
5. A system according to claim 3, characterized in that the information determination unit is adapted to:
searching a preset paper state sequence table;
and if the state signal sequence is matched with the double-sheet full-overlapping sequence in the paper state sequence table, determining that the paper to be detected is double-sheet full-overlapping.
6. The system of any one of claims 1-5, wherein the primary detection means is further configured to:
when the paper to be detected is determined to be double-sheet full overlapping, the machine table of the transmission device is controlled to stop transmission, so that an operator can perform detection operation on the operation paper.
7. A flaw detection method of paper sheets, characterized by being performed by the flaw detection system according to any one of claims 1 to 6, comprising:
the method comprises the steps that a first-stage detection device is used for detecting the paper to be detected on the transmission device in a full-overlapping double manner;
and detecting the defective paper on the paper to be detected on the transmission device through a secondary detection device, wherein the defective paper comprises non-fully overlapped double sheets.
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| CN1689806A (en) * | 2004-04-23 | 2005-11-02 | 利优比株式会社 | Sheet-fed printing press |
| CN201105535Y (en) * | 2007-10-12 | 2008-08-27 | 江苏昌昇集团股份有限公司 | Ultrasonic double-sheet controller |
| CN203212062U (en) * | 2013-04-08 | 2013-09-25 | 上海烟草集团有限责任公司 | Paper detection device |
| CN110861401A (en) * | 2019-11-27 | 2020-03-06 | 杭州日报报业集团盛元印务有限公司 | Ultrasonic double-sheet control system based on Arduino software and hardware platform |
| CN112871733A (en) * | 2020-12-24 | 2021-06-01 | 广州市普理司科技有限公司 | Appearance detection processing equipment for single-sheet paper products and control method thereof |
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| KR101578771B1 (en) * | 2014-02-18 | 2015-12-18 | 노틸러스효성 주식회사 | An ultrasonic sensor for detecting double notes and the detection method using the same |
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| CN1689806A (en) * | 2004-04-23 | 2005-11-02 | 利优比株式会社 | Sheet-fed printing press |
| CN201105535Y (en) * | 2007-10-12 | 2008-08-27 | 江苏昌昇集团股份有限公司 | Ultrasonic double-sheet controller |
| CN203212062U (en) * | 2013-04-08 | 2013-09-25 | 上海烟草集团有限责任公司 | Paper detection device |
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