阅读说明：本技术 一种非接触式重张检测方法 (Non-contact type overlapped sheet detection method ) 是由 陈文正 史鹏辉 于 2021-08-03 设计创作，主要内容包括：本发明公开了一种非接触式重张检测方法,包括以下步骤：步骤一：在双皮带输送结构上安装有激光位移传感器A和激光位移传感器B,所述激光位移传感器A和激光位移传感器B上下垂直安装,确保产品从激光位移传感器A和激光位移传感器B中间穿过；步骤二：激光位移传感器A和激光位移传感器B通过模拟量信号把测量数据传输至PLC。本发明的有益效果是：激光位移传感器A和激光位移传感器B是连续不断的在进行测距,可编程逻辑控制器必须判断哪些是有效数据,哪些数据是无效数据,通过间隔取值,并计算出平均数和标准厚度阈值做比较得出是否重张。(The invention discloses a non-contact type overlapped sheet detection method, which comprises the following steps: the method comprises the following steps: the double-belt conveying structure is provided with a laser displacement sensor A and a laser displacement sensor B, and the laser displacement sensor A and the laser displacement sensor B are vertically arranged up and down to ensure that a product passes through the middle of the laser displacement sensor A and the laser displacement sensor B; step two: the laser displacement sensor A and the laser displacement sensor B transmit the measured data to the PLC through analog quantity signals. The invention has the beneficial effects that: the laser displacement sensor A and the laser displacement sensor B continuously measure the distance, the programmable logic controller must judge which data are valid data and which data are invalid data, values are taken at intervals, and the average value and the standard thickness threshold value are calculated and compared to obtain whether the sheet is overlapped.)

1. A non-contact overlapped sheet detection method, comprising the steps of:

the method comprises the following steps: the double-belt conveying structure is provided with a laser displacement sensor A and a laser displacement sensor B through a support, and the laser displacement sensor A and the laser displacement sensor B are vertically arranged through the support, so that a product is ensured to penetrate through the middle of the laser displacement sensor A and the laser displacement sensor B;

step two: the laser displacement sensor A and the laser displacement sensor B transmit the measured data to the PLC through analog signals;

step three: according to the product conveying speed and the length of the product in the conveying direction, the PLC calculates the time required for the product to pass through the overlapped detection mechanism;

step four: the optical fiber sensor detects that a product transmits a signal to the PLC, the PLC starts a timer, values are taken from the two laser displacement sensors once every 2ms, the value taking times and effective data are judged according to the time calculated in the third step, and the value taking thicknesses T1 and T2.

Step five: under the static condition, the thickest position of the outer package of the product is placed between two laser displacement sensors for standard thickness calibration, and the PLC samples according to the standard thickness and generates a re-tensioning threshold value T according to the characteristics of the product;

step six: judging whether a product has a refolding state according to a formula T < (T2+ T3+. T (n-1))/n-2; if the product is overlapped, the PLC controls the code assigning equipment not to assign codes to the product, the product reaches the rejecting station, and the rejecting mechanism is controlled to reject the product.

2. The non-contact double sheet detection method as claimed in claim 1, wherein the emitted laser beams of the laser displacement sensor A and the laser displacement sensor B are coincident.

3. The method as claimed in claim 2, wherein the double belt comprises a first belt and a second belt, the first belt and the second belt are arranged in a gap, and the laser beams emitted by the laser displacement sensor A and the laser displacement sensor B are coincided through the gap.

Technical Field

The invention relates to the technical field of overlapped sheet detection, in particular to a non-contact overlapped sheet detection method.

Background

Before the product is produced and packaged, the production date needs to be assigned to each packaging bag or packaging box. The prefabricated packaging bags and the packaging boxes are generally in a wholly-beaten shape after being manufactured, the wholly-beaten packaging bags or the packaging boxes are required to be separated into single packaging bags or packaging boxes through a paging device, and the outer packaging of each product is conveniently endowed with codes by code endowing equipment.

Because the paging device generally pages through friction type, the structure and principle and the factors of the product per se can not ensure that the separated products do not have the phenomenon of continuous or repeated paging. Because the product packaging is of various types, the surface of the outer packaging of the separated product is uneven, and the packaging bags have different forms and different materials. The existing sensor technology can not directly detect whether the product is overlapped or not.

Disclosure of Invention

The invention aims to provide a non-contact type double-sheet detection method, wherein the distance measurement is continuously carried out through a laser displacement sensor A and a laser displacement sensor B, a programmable logic controller must judge which data are valid data and invalid data, and the double-sheet detection method is used for obtaining whether the double-sheet is formed or not through interval value taking and calculating the average value and comparing the average value with a standard thickness threshold value.

The technical scheme of the invention is realized as follows:

a non-contact double sheet detection method comprising the steps of:

the method comprises the following steps: the double-belt conveying structure is provided with a laser displacement sensor A and a laser displacement sensor B through a support, and the laser displacement sensor A and the laser displacement sensor B are vertically arranged through the support, so that a product is ensured to penetrate through the middle of the laser displacement sensor A and the laser displacement sensor B;

step two: the laser displacement sensor A and the laser displacement sensor B transmit the measured data to the PLC through analog signals;

step three: according to the product conveying speed and the length of the product in the conveying direction, the PLC calculates the time required for the product to pass through the overlapped detection mechanism;

step four: the optical fiber sensor detects that a product transmits a signal to the PLC, the PLC starts a timer, values are taken from the two laser displacement sensors once every 2ms, the value taking times and effective data are judged according to the time calculated in the third step, and the value taking thicknesses T1 and T2.

Step five: under the static condition, the thickest position of the outer package of the product is placed between two laser displacement sensors for standard thickness calibration, and the PLC samples according to the standard thickness and generates a re-tensioning threshold value T according to the characteristics of the product;

step six: judging whether a product has a refolding state according to a formula T < (T2+ T3+. T (n-1))/n-2; if the overlapped PLC exists, the code assigning equipment is controlled not to assign codes to the products, the products reach the rejecting station, and the rejecting mechanism is controlled to reject the products.

Further, the emitted laser of the laser displacement sensor a and the laser displacement sensor B should coincide.

Further, the double-belt comprises a first belt and a second belt, the first belt and the second belt are arranged in a gap mode, and laser emitted by the laser displacement sensor A and laser emitted by the laser displacement sensor B are overlapped through the gap.

The invention has the beneficial effects that: whether the outer packaging bag or the packaging box of the product has the detection of the overlapped sheet or not is realized through the laser displacement sensor A and the laser displacement sensor B which are arranged up and down, the laser displacement sensor A and the laser displacement sensor B are required to be vertical relative to the product after being arranged, and form a flat angle, the surface of the product is not flat in a motion state due to the self reason of the product, and the positions of the collection points of the laser displacement sensor A and the laser displacement sensor B relative to the product are required to be ensured to be consistent when the PLC takes values at each time. In addition, the laser displacement sensor A and the laser displacement sensor B continuously measure the distance, the programmable logic controller must judge which data are valid data and which data are invalid data, and the distance value is calculated, and the average value and the standard thickness threshold value are calculated to compare to obtain whether the sheet is overlapped.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a bracket of a non-contact type double sheet detection apparatus;

FIG. 2 is a schematic diagram of a non-contact double sheet detection device.

In the figure:

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

According to an embodiment of the present invention, a non-contact double sheet detection method is provided.

Referring to fig. 1-2, a non-contact overlapped sheet detecting method according to an embodiment of the present invention includes the steps of:

the method comprises the following steps: a laser displacement sensor A2 and a laser displacement sensor B3 are mounted on the double-belt conveying structure through a bracket 1, the laser displacement sensor A2 and the laser displacement sensor B3 are vertically mounted up and down, and a product is ensured to pass through the middle of the laser displacement sensor A2 and the laser displacement sensor B3;

step two: the laser displacement sensor A2 and the laser displacement sensor B3 transmit the measured data to the PLC through analog quantity signals;

step three: according to the product conveying speed and the length of the product in the conveying direction, the PLC calculates the time required for the product to pass through the overlapped detection mechanism;

step four: the optical fiber sensor 4 detects that a product transmits a signal to the PLC, the PLC starts a timer, values are taken from the two laser displacement sensors once every 2ms, the value taking times and effective data are judged according to the time calculated in the third step, and the value taking thicknesses T1 and T2.

Step five: under the static condition, the thickest position of the outer package of the product is placed between two laser displacement sensors for standard thickness calibration, and the PLC samples according to the standard thickness and generates a re-tensioning threshold value T according to the characteristics of the product;

step six: judging whether a product has a refolding state according to a formula T < (T2+ T3+. T (n-1))/n-2; if the overlapped PLC exists, the code assigning equipment is controlled not to assign codes to the products, the products reach the rejecting station, and the rejecting mechanism is controlled to reject the products.

Further, the emitting laser of the laser displacement sensor a2 and the laser displacement sensor B3 should be coincident.

Further, the double-belt comprises a first belt 5 and a second belt 6, the first belt 5 and the second belt 6 are arranged in a gap, and the laser emitted by the laser displacement sensor A2 and the laser emitted by the laser displacement sensor B3 are coincided through the gap.

As shown in fig. 1-2, the support 1 is mounted on the conveying structure, the laser displacement sensor a2 is mounted at the top end of the support 1, the laser displacement sensor B3 is mounted at the bottom end of the support 1, the optical fiber sensor 4 is mounted at the bottom of the laser displacement sensor a2, and the laser displacement sensor a2 and the laser displacement sensor B3 form a re-tensioning detection mechanism.

Two belts include belt one 5 and belt two 6, belt one 5 and two 6 parallel arrangement of belt are on transport structure, and belt one 5 and two 6 clearance arrangements of belt, laser displacement sensor A2 passes through support 1 and installs the top in the clearance between belt one 5 and belt two 6, laser displacement sensor B3 passes through support 1 and installs the below in the clearance between belt one 5 and belt two 6, and when the product of carrying through two belts was carried in clearance department like this, can ensure that the product passed through in the middle of laser displacement sensor A2 and the laser displacement sensor B3 to the realization detects.

During detection of the product, in the third step, according to the conveying speed of the product and the length of the product in the conveying direction, the PLC calculates the time required for the product to pass through the overlapped detection mechanism, namely the time required for the product to pass through the laser displacement sensor A2 and the laser displacement sensor B3; detecting that a product transmits a signal to the PLC through the optical fiber sensor 4 in the fourth step, starting the timer by the PLC, taking values from the two laser displacement sensors once every 2ms, judging the value taking times and effective data according to the time calculated in the third step, and calculating the value taking thicknesses T1 and T2. Calculating the average thickness value X of the product in the effective secondary value through a public indicator (T2+ T3+. T (n-1))/n-2; then the thickness average value X is compared with a value generated by placing the thickest position of the outer package of the product between a laser displacement sensor A2 and a laser displacement sensor B3 under a static condition to carry out standard thickness calibration to generate a re-tensioning threshold value T; if the numerical value of the X is larger than the numerical value of the re-tensioning threshold T, the re-tensioning state is judged, the PLC controls the code-assigning equipment not to assign codes to the products, the products reach the rejecting station, and the rejecting mechanism is controlled to reject the products; otherwise, it is normal.

The invention has the beneficial effects that: whether the outer packaging bag or the packaging box of the product has the detection of the overlapped sheet or not is realized through the laser displacement sensor A and the laser displacement sensor B which are arranged up and down, the laser displacement sensor A and the laser displacement sensor B are required to be vertical relative to the product after being arranged, and form a flat angle, the surface of the product is not flat in a motion state due to the self reason of the product, and the positions of the collection points of the laser displacement sensor A and the laser displacement sensor B relative to the product are required to be ensured to be consistent when the PLC takes values at each time. In addition, the laser displacement sensor A and the laser displacement sensor B continuously measure the distance, the programmable logic controller must judge which data are valid data and which data are invalid data, and the distance value is calculated, and the average value and the standard thickness threshold value are calculated to compare to obtain whether the sheet is overlapped.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.