Diffuse reflection type code spraying and counting device and method

Abstract

The invention discloses a diffuse reflection type code spraying and counting device and method, and belongs to the technical field of code spraying machines. The first diffuse reflection electric eye is arranged at the tail end of the conveying belt, a certain distance is reserved between the first diffuse reflection electric eye and the conveying belt, it is ensured that no shielding object exists in the detection area of the first diffuse reflection electric eye, and therefore interference of the conveying belt and other environment colors on the detection precision of the first diffuse reflection electric eye can be effectively avoided; only when the object to be subjected to code spraying passes through the detection area of the first diffuse reflection electric eye, the nozzle can be started, so that the code spraying accuracy is greatly ensured, and the phenomenon of code spraying missing or repeated code spraying caused by small color difference is fundamentally solved. Meanwhile, an object to be subjected to code spraying passes through a detection area of the first diffuse reflection electric eye, and a counting probe prepares to count; when the object to be subjected to code spraying is subjected to code spraying and leaves the detection area of the first diffuse reflection electric eye, the counting probe performs counting, so that one-to-one correspondence of sprayed codes and counting can be effectively ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of inkjet printers, and more specifically, relates to a diffuse reflection type inkjet printer and counting device and method thereof. Background Art

[0002] The inkjet printer is a non-contact inkjet marking system controlled by a single-chip microcomputer. It can print production date, batch number, barcode, trademark pattern, anti-counterfeiting mark and Chinese characters on the surface of various objects. It is widely used in the food industry, cosmetics industry, pharmaceutical industry, automobile and other parts processing industries.

[0003] The inkjet printer is mainly composed of a control system, a detection component, an inkjet execution component, an ink supply system, etc. Among them, the detection component is used to detect the workpiece to be coded that will enter the coding area, and then transmit the detection signal to the control system. After the control system receives the signal that the workpiece has entered the coding area, it controls the ink supply system to transport the ink to the inkjet execution component, and the inkjet execution component accurately sprays the ink onto the surface of the workpiece, thereby forming a clear and complete inkjet mark.

[0004] The detection component is what we usually call an electric eye, and the electric eye is usually divided into a photoelectric sensing type electric eye and a diffuse reflection electric eye. The photoelectric sensing type electric eye generally includes a transmitting end and a receiving end that are arranged opposite to each other. It mainly uses the photoelectric effect to detect the presence of an object, that is, when an object passes through a light beam, the light beam is blocked, resulting in the receiving end being unable to receive the light signal, and thereby determine whether an object has passed. The advantage of this type of electric eye is that the detection accuracy is high and it is not easily affected by the color difference of the environment. However, for some items that do not have a clear height, such as packaging bags, film products, etc., diffuse reflection electric eyes are required. The diffuse reflection electric eye determines whether a workpiece has passed by emitting light to the surface of the workpiece and then receiving the reflected light. However, the biggest problem with the diffuse reflection electric eye is that the accuracy of sensing the object is easily affected by the color of the environment, which can easily cause the phenomenon of missing or repeated coding.

[0005] The prior art also provides some methods to avoid missing or repeated coding. For example, in the patent CN208324584U, by setting a photoelectric switch transmitter and a photoelectric switch receiver on both sides of the synchronous belt, it can also accurately identify and achieve precise coding when the gap between two adjacent packaging bottles is small when the packages are continuously discharged. However, this solution is essentially a photoelectric induction type electric eye and is not suitable for coding operations on thin items such as packaging bags and film products.

[0006] For example, in the patent CN213083697U, a color sensor is added to scan the material after coding to determine whether the coding of the material is successful, and the detection information is summarized through the controller. Although this method can effectively determine whether the coding is successful, it cannot fundamentally solve the problems of missed coding and repeated coding. At the same time, adding a color sensor will undoubtedly increase the cost of the equipment. Therefore, designing a diffuse reflection coding device that can effectively reduce color difference interference has important production practical significance. Summary of the invention

[0007] 1. Problems to be solved

[0008] In view of the problem in the prior art that diffuse reflection type inkjet printers are easily disturbed by color difference, resulting in poor inkjet coding accuracy, the present invention provides a diffuse reflection type inkjet coding and counting device and method thereof, which minimizes the interference of environmental color difference and ensures the accuracy of inkjet coding by ensuring that there are no other obstructions within the detection range of the diffuse reflection electric eye.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the present invention is as follows:

[0011] The diffuse reflection type coding and counting device of the present invention comprises a conveyor belt for conveying articles to be coded, a nozzle is arranged above the conveyor belt, and the nozzle is connected to the coding equipment, and is characterized in that: a receiving part is arranged at the end of the conveyor belt, and a first diffuse reflection electric eye is arranged on the moving path of the articles to be coded from the conveyor belt to the receiving part; wherein,

[0012] The distance between the first diffuse reflection electric eye and the nozzle is smaller than the length of the object to be coded along the conveying direction, and there is no obstruction in the detection area of ​​the first diffuse reflection electric eye;

[0013] The first diffuse reflection electric eye is electrically connected to a counting probe, and a shielding object is always provided in the detection area of ​​the counting probe;

[0014] When the first diffuse reflection electric eye detects the object to be coded, the nozzle starts to code and the counting probe is ready to count; when the object to be coded is completed and leaves the detection area of ​​the first diffuse reflection electric eye, the counting probe starts counting.

[0015] In some embodiments, the first diffuse reflection electric eye is located in the gap between the conveyor belt and the receiving portion.

[0016] In some embodiments, the first diffuse reflection electric eye is located in an avoidance groove on the receiving portion; the first diffuse reflection electric eye is arranged upward and does not exceed the upper surface of the receiving portion.

[0017] In some embodiments, the receiving portion is a fixed support plate or a conveyor belt.

[0018] In some embodiments, the height of the receiving portion is not higher than the height of the conveyor belt, and the height difference between the two is controlled to be 18±4 mm.

[0019] In some embodiments, an infrared transmitter is further included, and the infrared transmitter is used to form a positioning mark line on the conveyor belt.

[0020] In some embodiments, a second diffuse reflection electric eye is provided on the side of the first diffuse reflection electric eye away from the nozzle, and there is no obstruction in the detection area of ​​the second diffuse reflection electric eye; when the second diffuse reflection electric eye detects that an object passes through, the conveyor belt is controlled to stop conveying.

[0021] In some embodiments, the distance between the second diffuse reflection electric eye and the first diffuse reflection electric eye is controlled to be 5-20 cm.

[0022] In some embodiments, a control system is further included, wherein the control system includes a 220v power supply, and a 24v power conversion module and a second delay relay KT2 arranged in parallel on the 220v power supply;

[0023] The 24V power conversion module is connected in parallel with a first delay relay KT1, a first intermediate relay KM1, a second intermediate relay KM2, and a third intermediate relay KM3;

[0024] The power interface of the first diffuse reflection electric eye is connected to the 24V power conversion module, and the signal output end of the first diffuse reflection electric eye is electrically connected to the first delay relay KT1;

[0025] The normally open contact KM1-1 of the first intermediate relay KM1, the first intermediate relay KM1, and the normally closed contact KT2-1 of the second delay relay KT2 are sequentially arranged in series; the normally open contact KT1-1 of the first delay relay KT1 is arranged in parallel with the normally open contact KM1-1, and the first intermediate relay KM1 is connected to an intermediate control module, and the output end of the intermediate control module is connected to the inkjet control phase line;

[0026] The normally open contact KM1-2 of the first intermediate relay KM1, the normally open contact KM2-1 of the second intermediate relay KM2, the second intermediate relay KM2, and the normally closed contact KT2-2 of the second delay relay KT2 are sequentially arranged in series; the normally closed contact KT1-2 of the first delay relay KT1 is arranged in parallel with the normally open contact KM2-1;

[0027] The normally open contact KM2-2 of the second intermediate relay KM2, the normally open contact KM1-3 of the first intermediate relay KM1, and the third intermediate relay KM3 are sequentially arranged in series;

[0028] One end of the normally open contact KM3-1 of the third intermediate relay KM3 is connected to the L end of the 220v power supply, and the other end is connected to the N end of the 220v power supply through the second delay relay KT2;

[0029] The power interface of the counting probe is connected to the output end of the 24V power conversion module, and its signal output end is connected to the X0 port of the PLC display through the normally open contact KM3-2 of the third intermediate relay KM3.

[0030] A coding and counting method of the present invention comprises the following steps:

[0031] The object to be coded is transported by the conveyor belt. After the front of the object to be coded leaves the conveyor belt, it is detected by the first diffuse reflection electric eye without any obstruction in the detection area, and the detection signal is transmitted to the nozzle and the counting probe. At this time, the nozzle starts to perform coding operation on the same object to be coded located below it; the counting probe is ready for counting.

[0032] After the coded object leaves the detection area of ​​the first diffuse reflection electric eye, the first diffuse reflection electric eye transmits the disappearance signal to the counting probe again, and the counting probe starts counting.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) Compared with the traditional method of directly setting the first diffuse reflection electric eye directly above the conveyor belt, the diffuse reflection electric eye of the present invention is susceptible to interference from the color of the conveyor belt itself. In the present invention, the first diffuse reflection electric eye is set at the end of the conveyor belt, and a certain distance is left between the two, and it is ensured that there is no obstruction in the detection area of ​​the first diffuse reflection electric eye, so as to effectively avoid the interference of the conveyor belt and other environmental colors on the detection accuracy of the first diffuse reflection electric eye; only when the object to be coded passes through the detection area of ​​the first diffuse reflection electric eye, the nozzle will be started, thereby greatly ensuring the accuracy of the coding, and solving the problem of missing or repeated coding due to small color difference from the root.

[0036] (2) A diffuse reflection type inkjet coding and counting device of the present invention uses an infrared transmitter to form a positioning mark line on the conveyor belt. The positioning mark line can be used as a reference for the placement of the items to be coded. On the one hand, it can effectively prevent the items to be coded from deviating from the nozzle or the first diffuse reflection electric eye, thereby affecting the normal progress of the inkjet coding; on the other hand, it can make the relative positions between different items to be coded and the nozzle more uniform, which is conducive to ensuring the consistency of the inkjet coding position. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a diffuse reflection type inkjet coding and counting device of the present invention;

[0038] Figure 2 for Figure 1 The enlarged schematic diagram of point A in the middle;

[0039] Figure 3 It is a structural schematic diagram of the receiving part in the present invention;

[0040] Figure 4 It is a connection diagram of the control system in the present invention.

[0041] In the figure: 100, conveyor belt; 200, nozzle; 300, receiving portion; 310, avoidance groove;

[0042] 400, first diffuse reflection electric eye; 500, second diffuse reflection electric eye; 600, infrared transmitter; 610, positioning mark line;

[0043] 700, counting probe; 810, 24V power conversion module; 820, intermediate control module. DETAILED DESCRIPTION

[0044] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] As introduced in the background technology, diffuse reflection inkjet printers are easily affected by the color of the environment, which can easily lead to missing or repeated coding. In actual working scenarios, the colors of the surrounding environment are complex and changeable. When the color of the environment is similar to the color of the workpiece or has similar optical reflection characteristics, the reflected light signal received by the diffuse reflection electric eye will be confused, making it difficult to accurately judge the position and state of the workpiece. This situation can easily lead to missing or repeated coding, seriously affecting the accuracy and stability of the coding operation, and reducing production efficiency and product quality.

[0047] Normally, the workpiece to be detected is usually conveyed to the coding area by a conveyor belt. The color of the conveyor belt is mostly dark, which undoubtedly increases the difficulty of the diffuse reflection electric eye to identify the object. Generally, accurate detection results can be achieved by adjusting the trigger threshold of the diffuse reflection electric eye or requiring a high-precision electric eye. However, when the color of some objects is similar to that of the conveyor belt, the light emitted by the diffuse reflection electric eye is reflected by the surface of the object and the conveyor belt, and the reflected light of the two has little difference in intensity, spectrum and other characteristics, resulting in the signal received by the electric eye being difficult to clearly distinguish whether it comes from the object or the conveyor belt. In addition, for some objects that are transparent materials themselves, they almost show the color of the conveyor belt on the conveyor belt. In this case, due to the lack of necessary color difference between the object and the conveyor belt, the diffuse reflection electric eye is difficult to capture the effective difference in reflected light, which further aggravates the difficulty of resolution, greatly reduces the accuracy of the detection result, and increases the risk of missing or repeated coding during the coding process. To this end, the present invention aims to provide a method that can effectively reduce or even avoid the interference of environmental colors on the diffuse reflection electric eye, ensure the accuracy of the detection results, and reduce the risk of missing or repeated coding.

[0048] The present invention is further described below in conjunction with specific embodiments.

[0049] like Figure 1 , Figure 2 , Figure 3 As shown, a diffuse reflection type inkjet coding device of this embodiment includes a conveyor belt 100, a nozzle 200 and a first diffuse reflection electric eye 400. The conveyor belt 100 is used to transport items to be coded. The nozzle 200 is mounted above the conveyor belt 100 and is used to perform coding operations on the items to be coded passing below it. Of course, the nozzle 200 needs to be connected to the main body of the inkjet coding device. The structure and working principle of the inkjet coding device are all prior art and will not be described in detail here. The first diffuse reflection electric eye 400.

[0050] The first diffuse reflection electric eye 400 is arranged near the end of the conveyor belt 100, and there is a certain gap between the first diffuse reflection electric eye 400 and the end of the conveyor belt 100. At the same time, there is no obstruction in the detection area of ​​the first diffuse reflection electric eye 400. In addition, it is necessary to ensure that the longitudinal distance between the first diffuse reflection electric eye 400 and the nozzle 200 is less than the length of the object to be coded, and the lateral distance between the first diffuse reflection electric eye 400 and the nozzle 200 is less than the width of the object to be coded. In other words, at a certain moment or within a certain period of time, the detection area of ​​the first diffuse reflection electric eye 400 and the coding area of ​​the nozzle 200 can simultaneously cover different parts of the object to be coded.

[0051] It should be noted that the above-mentioned “longitudinal distance” and “length” are along the conveying direction of the conveyor belt 100, that is, the distance in the X direction; and the “transverse distance” and “width” are the directions perpendicular to the conveying direction of the conveyor belt 100, that is, the distance in the Y direction.

[0052] During operation, the front end of the object to be coded leaves the conveyor belt 100 first; when the first diffuse reflection electric eye 400 detects the existence of the object to be coded, at this time, at least part of the area of ​​the object to be coded is located below the nozzle 200, and the nozzle 200 starts to spray the code to complete the coding operation of the object to be coded. Since there is no obstruction in the detection area of ​​the first diffuse reflection electric eye 400, the interference of the conveyor belt 100 and other environmental colors on the detection accuracy of the first diffuse reflection electric eye 400 can be effectively avoided; only when the object to be coded passes through the detection area of ​​the first diffuse reflection electric eye 400, the nozzle 200 will be started, thereby greatly ensuring the accuracy of the coding, and solving the problem of missing or repeated coding due to small color difference from the root.

[0053] In addition, the first diffuse reflection electric eye 400 is also electrically connected to the counting probe 700, and there is always an obstruction in the detection area of ​​the counting probe 700. When the first diffuse reflection electric eye 400 detects the object to be coded, the nozzle 200 starts to code, and the counting probe 700 counts and prepares; when the object to be coded is completed and leaves the detection area of ​​the first diffuse reflection electric eye 400, the counting probe 700 counts.

[0054] That is to say, the counting probe 700 is always in a "silent" waiting state, but does not perform counting work; it will only perform counting work after the item is coded and leaves the first diffuse reflection electric eye 400, thereby ensuring a one-to-one correspondence between coding and counting, and preventing the phenomenon of inconsistent coding and counting. Since the counting probe 700 does not participate in the actual detection of the items to be coded, it is only activated by the output signal of the first diffuse reflection electric eye 400. Therefore, the counting probe 700 can be set below the installation frame of the conveyor belt 100 ( Figure 1 not shown) to prevent interference with other components.

[0055] Specifically, refer to Figure 2 , Figure 3 As shown, a receiving portion 300 is provided at the end of the conveyor belt 100, and a certain gap is left between the two. The first diffuse reflection electric eye 400 is arranged on the moving path of the object to be coded from the conveyor belt 100 to the receiving portion 300, and ensures that the object to be coded can be detected by the first diffuse reflection electric eye 400 before it completely leaves the nozzle 200 area.

[0056] In some embodiments, the first diffuse reflection electric eye 400 is located in the gap between the conveyor belt 100 and the receiving portion 300, for example, it can be installed on the frame of the conveyor belt 100 through a bracket. Of course, it can also be set on the receiving portion 300. Preferably, the receiving portion 300 can adopt a conveyor belt to improve the transfer efficiency of the items to be coded.

[0057] In actual use, it is found that due to the presence of the first diffuse reflection electric eye 400, the gap between the conveyor belt 100 and the receiving part 300 is large, which affects the smoothness of the transfer of the items to be coded from the conveyor belt 100 to the receiving part 300. For some thinner items, such as protective films, there will be a certain adsorption force between them and the conveyor belt 100. If the gap between the conveyor belt 100 and the receiving part 300 is large, the protective film will turn down with the end of the conveyor belt 100, and thus cannot be smoothly transferred to the receiving part 300.

[0058] To this end, in this embodiment, an avoidance groove 310 is provided on the receiving part 300. The first diffuse reflection electric eye 400 is arranged upward in the avoidance groove 310 and does not exceed the upper surface of the receiving part 300. At this time, the receiving part 300 can adopt a fixed support plate. Since the first diffuse reflection electric eye 400 is not placed in the gap between the receiving part 300 and the first diffuse reflection electric eye 400; at this time, under the premise of ensuring that the receiving part 300 and the conveyor belt 100 do not interfere with each other, the distance of the gap can be reduced as much as possible to ensure that the items to be coded can be smoothly transferred from the conveyor belt 100 to the receiving part 300.

[0059] Of course, the upper surface of the receiving portion 300 should not exceed the upper surface of the conveyor belt 100. Preferably, the height of the receiving portion 300 should be slightly lower than the height of the conveyor belt 100 to ensure the smoothness of the transfer of the items to be coded. However, if the height difference between the two is too large, the items to be coded are prone to hanging during the transfer process, which affects the detection result of the first diffuse reflection electric eye 400. Therefore, in this embodiment, the height difference between the two is controlled within 18±4mm to take into account the smoothness of the item transfer and the detection accuracy of the first diffuse reflection electric eye 400.

[0060] Furthermore, a second diffuse reflection electric eye 500 is provided on the side of the first diffuse reflection electric eye 400 away from the nozzle 200, and there is no obstruction in the detection area of ​​the second diffuse reflection electric eye 500. When the second diffuse reflection electric eye 500 detects that an object has passed, the conveyor belt 100 is controlled to stop conveying. This is to prevent the operator from being unable to transfer the coded objects in time due to the excessively fast conveying speed, causing the objects to pile up and affect the normal progress of the coding. The second diffuse reflection electric eye 500 can be set in the same way as the first diffuse reflection electric eye 400, and will not be described again.

[0061] Preferably, the first diffuse reflection electric eye 400 and the second diffuse reflection electric eye 500 are both set upward, that is, during detection, the object to be coded passes above the first diffuse reflection electric eye 400. At the same time, the spacing between the first diffuse reflection electric eye 400 and the second diffuse reflection electric eye 500 is controlled within the range of 5-20 cm, preferably 8-12 cm. The setting of this spacing is mainly to leave a certain detection time for the first diffuse reflection electric eye 400 to ensure that it enters the detection range of the second diffuse reflection electric eye 500 after the detection result of the first diffuse reflection electric eye 400 is stable. At the same time, the nozzle 200 will only spray the code after the detection result of the first diffuse reflection electric eye 400 is stable. In this way, it can effectively prevent the second diffuse reflection electric eye 500 from detecting the detection result of the first diffuse reflection electric eye 400 when it is not stable, and the conveyor belt 100 will stop; thereafter, after the detection result of the first diffuse reflection electric eye 400 is stable, since the conveyor belt 100 has stopped, it will affect the normal coding operation of the nozzle 200.

[0062] A diffuse reflection type inkjet device of this embodiment is further provided with an infrared emitter 600 on the frame of the conveyor belt 100. The infrared emitter 600 can form a positioning mark line 610 at the discharge end of the conveyor belt 100. The positioning mark line 610 can be used as a reference for the placement of the items to be coded. On the one hand, it can effectively prevent the items to be coded from deviating from the nozzle 200 or the first diffuse reflection electric eye 400, affecting the normal progress of the inkjet; on the other hand, it can make the relative positions between different items to be coded and the nozzle 200 more uniform, which is conducive to ensuring the consistency of the inkjet position. Preferably, the nozzle 200 is located directly above the extension line of the positioning mark line 610, so that a larger fault tolerance space can be left for the items to be coded.

[0063] Compared with the conventional method of directly setting the first diffuse reflection electric eye 400 directly above the conveyor belt 100, the first diffuse reflection electric eye 400 is easily interfered by the color of the conveyor belt 100 itself. In this embodiment, the first diffuse reflection electric eye 400 is set at the end of the conveyor belt 100, and a certain distance is left between the two, and it is ensured that there is no obstruction in the detection area of ​​the first diffuse reflection electric eye 400, so as to effectively avoid the interference of the conveyor belt 100 and other environmental colors on the detection accuracy of the first diffuse reflection electric eye 400. Only when the object to be coded passes through the detection area of ​​the first diffuse reflection electric eye 400, the nozzle 200 will be started, thereby greatly ensuring the accuracy of coding, and solving the problem of missing or repeated coding due to small color difference from the root.

[0064] refer to Figure 4 As shown, a diffuse reflection type inkjet printer of this embodiment also includes a control system, which includes a 220v power supply, and a 24v power conversion module 810 and a second delay relay KT2 arranged in parallel on the 220v power supply; wherein,

[0065] The 24V power conversion module 810 is connected in parallel with a first delay relay KT1, a first intermediate relay KM1, a second intermediate relay KM2, and a third intermediate relay KM3;

[0066] The power interface of the first diffuse reflection electric eye 400 is connected to the 24V power conversion module 810, and the signal output end of the first diffuse reflection electric eye 400 is electrically connected to the first delay relay KT1;

[0067] The normally open contact KM1-1 of the first intermediate relay KM1, the first intermediate relay KM1, and the normally closed contact KT2-1 of the second delay relay KT2 are sequentially arranged in series; the normally open contact KT1-1 of the first delay relay KT1 is arranged in parallel with the normally open contact KM1-1, and the first intermediate relay KM1 is connected to the intermediate control module 820, and the output end of the intermediate control module 820 is connected to the inkjet control phase line of the inkjet device;

[0068] The normally open contact KM1-2 of the first intermediate relay KM1, the normally open contact KM2-1 of the second intermediate relay KM2, the second intermediate relay KM2, and the normally closed contact KT2-2 of the second delay relay KT2 are sequentially arranged in series; the normally closed contact KT1-2 of the first delay relay KT1 is arranged in parallel with the normally open contact KM2-1;

[0069] The normally open contact KM2-2 of the second intermediate relay KM2, the normally open contact KM1-3 of the first intermediate relay KM1, and the third intermediate relay KM3 are sequentially arranged in series;

[0070] One end of the normally open contact KM3-1 of the third intermediate relay KM3 is connected to the L end of the 220v power supply, and the other end is connected to the N end of the 220v power supply through the second delay relay KT2;

[0071] The power interface of the counting probe 700 is connected to the output end of the 24V power conversion module 810, and its signal output end is connected to the X0 port of the PLC display through the normally open contact KM3-2 of the third intermediate relay KM3.

[0072] The diffuse reflection type inkjet coding and counting device of this embodiment has the following specific working process:

[0073] The 220V power supply is turned on, and the 24V power supply conversion module 810 converts the 220V power supply into a 24V power supply. After the 24V power supply is turned on, the first diffuse reflection electric eye 400 is powered on.

[0074] When the first diffuse reflection electric eye 400 senses an object, the signal output terminal sends the signal to the first delay relay KT1, and a 24V working voltage is formed at both ends of the first delay relay KT1, and the first delay relay KT1 starts to work. After a certain delay time (the delay can be set according to the specific time), the normally open contact KT1-1 of the first delay relay KT1 is closed, and the normally closed contact KT1-2 is disconnected, preparing for the subsequent counting. At this time, since the first intermediate relay KM1 is powered on, the power supply at the A and B ends of the intermediate control module 820 is connected, and the signal is output to the coding equipment through the C and D ends, and then the nozzle 200 is controlled to perform the coding operation.

[0075] Then, the printed object leaves the detection area of ​​the first diffuse reflection electric eye 400, resulting in no signal output from the output end of the first diffuse reflection electric eye 400; at this time, the first delay relay KT1 disconnects the normally open contact KT1-1 due to power failure; but since the normally open contact KM1-1 is in a closed state at this time; therefore, the first intermediate relay KM1 continues to be energized and work.

[0076] At the same time, due to the loss of power to the first delay relay KT1, the normally closed contact KT1-2 is closed again; in addition, the normally open contact KM1-2 has been closed when the previous first intermediate relay KM1 was working; at this time, the second intermediate relay KM2 is energized and starts working, and the normally open contacts KM2-1 and KM2-2 are closed.

[0077] Since the normally open contact KM1-3 has been closed when the previous KM1 relay is working; at this time, the KM2 relay is energized and starts working, and the normally open contact KM2-2 is closed; at this time, the third intermediate relay KM3 is energized and works.

[0078] After the third intermediate relay KM3 works, the normally open contacts KM3-1 and KM3-2 are closed; at this time, the second delay relay KT2 is energized and works. At the same time, due to the closure of the normally open contact KM3-2, the signal of the counting probe 700 is sent to the X0 port of the PLC display for data processing and counting.

[0079] As the delay time of the second delay relay KT2 expires, the normally closed contact KT2-1 connected in series under the first intermediate relay KM1 is disconnected, the first intermediate relay KM1 loses power and stops working, and all the normally open contacts and normally closed contacts of the first intermediate relay KM1 return to their initial states.

[0080] At the same time, since the second delay relay KT2 is energized, the normally closed contact KT2-2 is disconnected, the second intermediate relay KM2 loses power and stops working, and all the normally open contacts and normally closed contacts of the second intermediate relay KM2 return to their initial states. At this point, a coding counting cycle is completed and ready for the next item recognition.

[0081] In addition, this embodiment also provides a coding and counting method, comprising the following steps:

[0082] The object to be coded is conveyed by the conveyor belt 100. After the front of the object to be coded leaves the conveyor belt 100, it is detected by the first diffuse reflection electric eye 400 without any obstruction in the detection area, and the detection signal is transmitted to the nozzle 200 and the counting probe 700. At this time, the nozzle 200 is started to perform coding operation on the same object to be coded located below it; the counting probe 700 is ready for counting;

[0083] After the coded object leaves the detection area of ​​the first diffuse reflection electric eye 400, the first diffuse reflection electric eye 400 transmits the disappearance signal to the counting probe 700 again, and the counting probe 700 starts counting.

[0084] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A diffuse reflection type coding and counting device, comprising a conveyor belt (100) for conveying articles to be coded, a nozzle (200) is provided above the conveyor belt (100), and the nozzle (200) is connected to a coding device, characterized in that: A receiving portion (300) is provided at the end of the conveyor belt (100), and a first diffuse reflection electric eye (400) is provided on the moving path of the article to be coded from the conveyor belt (100) to the receiving portion (300); wherein, The distance between the first diffuse reflection electric eye (400) and the nozzle (200) is smaller than the length of the object to be coded along the conveying direction, and there is no obstruction in the detection area of ​​the first diffuse reflection electric eye (400); The first diffuse reflection electric eye (400) is electrically connected to a counting probe (700), and a shielding object is always provided in the detection area of ​​the counting probe (700); When the first diffuse reflection electric eye (400) detects an object to be coded, the nozzle (200) starts to code and the counting probe (700) prepares to count; when the object to be coded completes coding and leaves the detection area of ​​the first diffuse reflection electric eye (400), the counting probe (700) starts counting.

2. A diffuse reflection type inkjet coding and counting device according to claim 1, characterized in that: The first diffuse reflection electric eye (400) is located in the gap between the conveyor belt (100) and the receiving portion (300).

3. A diffuse reflection type inkjet coding and counting device according to claim 1, characterized in that: The first diffuse reflection electric eye (400) is located in the avoidance groove (310) on the receiving portion (300); the first diffuse reflection electric eye (400) is arranged upward and does not exceed the upper surface of the receiving portion (300).

4. A diffuse reflection type inkjet coding and counting device according to claim 2 or 3, characterized in that: The receiving portion (300) is a fixedly arranged supporting plate or a conveying belt.

5. A diffuse reflection type inkjet coding and counting device according to claim 4, characterized in that: The height of the receiving portion (300) is not higher than the height of the conveyor belt (100), and the height difference between the two is controlled within 18±4 mm.

6. A diffuse reflection type inkjet coding and counting device according to any one of claims 1 to 3, characterized in that: It also includes an infrared transmitter (600), and the infrared transmitter (600) is used to form a positioning mark line (610) on the conveyor belt (100).

7. A diffuse reflection type inkjet coding and counting device according to any one of claims 1 to 3, characterized in that: A second diffuse reflection electric eye (500) is provided on the side of the first diffuse reflection electric eye (400) away from the nozzle (200), and there is no obstruction in the detection area of ​​the second diffuse reflection electric eye (500); when the second diffuse reflection electric eye (500) detects that an object has passed, the conveyor belt (100) is controlled to stop conveying.

8. A diffuse reflection type inkjet coding and counting device according to claim 7, characterized in that: The distance between the second diffuse reflection electric eye (500) and the first diffuse reflection electric eye (400) is controlled to be 5-20 cm.

9. A diffuse reflection type inkjet coding and counting device according to any one of claims 1 to 8, characterized in that: It also includes a control system, which includes a 220V power supply, and a 24V power conversion module (810) and a second delay relay KT2 arranged in parallel on the 220V power supply; The 24V power conversion module (810) is connected in parallel with a first delay relay KT1, a first intermediate relay KM1, a second intermediate relay KM2, and a third intermediate relay KM3; The power interface of the first diffuse reflection electric eye (400) is connected to a 24V power conversion module (810), and the signal output end of the first diffuse reflection electric eye (400) is electrically connected to a first delay relay KT1; The normally open contact KM1-1 of the first intermediate relay KM1, the first intermediate relay KM1, and the normally closed contact KT2-1 of the second delay relay KT2 are sequentially arranged in series; the normally open contact KT1-1 of the first delay relay KT1 is arranged in parallel with the normally open contact KM1-1, and the first intermediate relay KM1 is connected to an intermediate control module (820), and the output end of the intermediate control module (820) is connected to the inkjet control phase line; The normally open contact KM1-2 of the first intermediate relay KM1, the normally open contact KM2-1 of the second intermediate relay KM2, the second intermediate relay KM2, and the normally closed contact KT2-2 of the second delay relay KT2 are sequentially arranged in series; the normally closed contact KT1-2 of the first delay relay KT1 is arranged in parallel with the normally open contact KM2-1; The normally open contact KM2-2 of the second intermediate relay KM2, the normally open contact KM1-3 of the first intermediate relay KM1, and the third intermediate relay KM3 are sequentially arranged in series; One end of the normally open contact KM3-1 of the third intermediate relay KM3 is connected to the L end of the 220v power supply, and the other end is connected to the N end of the 220v power supply through the second delay relay KT2; The power interface of the counting probe (700) is connected to the output end of the 24V power conversion module (810), and its signal output end is connected to the X0 port of the PLC display via the normally open contact KM3-2 of the third intermediate relay KM3.

10. A coding and counting method, characterized in that: The following steps are included: The object to be coded is transported by a conveyor belt (100). After the front of the object to be coded leaves the conveyor belt (100), it is detected by a first diffuse reflection electric eye (400) without any obstruction in the detection area, and a detection signal is transmitted to the nozzle (200) and the counting probe (700). At this time, the nozzle (200) is started to perform a coding operation on the same object to be coded located below it; and the counting probe (700) is ready for counting. After the coded article leaves the detection area of ​​the first diffuse reflection electric eye (400), the first diffuse reflection electric eye (400) transmits the disappearance signal to the counting probe (700) again, and the counting probe (700) starts counting.

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