Device for detecting the anti-friction ability of the printed matter surface

Abstract

The present invention relates to the technical field of automated detection equipment, and discloses a device for detecting the anti-friction ability of the surface of printed matter. The lower pressing plate is horizontally arranged on the base platform, and the upper pressing plate is arranged directly above the lower pressing plate and is parallel to it; the conveyor belt is located between the upper pressing plate and the lower pressing plate and is in close contact with the upper surface of the lower pressing plate; in the detection state, the distance between the upper pressing plate and the lower pressing plate is slightly greater than the thickness of the printed matter to be detected placed on the conveyor belt, and the upper surface of the printed matter to be detected is in effective contact with the lower surface of the upper pressing plate; the first camera and the second camera are respectively used to collect pictures of the upper surface of the printed matter to be detected before and after entering between the upper pressing plate and the lower pressing plate, and both are signal-connected to the image analyzer. Compared with the prior art, the device of the present invention can very conveniently detect the anti-friction ability of the ink on the surface of the printed matter, has a simple structure and a reasonable design, and can be well combined with the production line for use.

Description

Technical Field

[0001] The present invention relates to the technical field of automated detection equipment, and particularly to a device for detecting the anti-friction ability of the surface of printed matter. Background Art

[0002] In the printing industry, the ink quality on the surface of printed matter directly affects the printing quality of the printed matter. Especially in the printing industry of various packaging boxes, due to mechanical integration, during the entire preparation process of the packaging boxes, the ink surface needs to undergo friction by various mechanical equipment.

[0003] It is known that in the actual gravure printing production process, in a drying environment of 140 °C, the printing ink will be in a soft state for a short time due to high temperature. The soft ink will be scraped off due to friction, thus causing printing problems. If the friction resistance of the ink on the surface of the packaging box is poor, the ink will be worn off directly during the preparation process, which will directly affect the quality and yield of the packaging box. Especially in the tobacco industry, the production and packaging of cigarette boxes are relatively complex. Especially for the packaging boxes of high-grade cigarettes, the ink quality on their surfaces will greatly affect the appearance of the finished cigarette boxes.

[0004] For a printing enterprise, choosing high-quality ink for printing is the first step to improve product quality. However, in the prior art, there is little mention of how to detect the friction resistance quality of the ink and what kind of equipment to use for detection. Summary of the Invention

[0005] Object of the Invention: Aiming at the problems existing in the prior art, the present invention provides a device for detecting the anti-friction ability of the surface of printed matter. This device can very conveniently detect the anti-friction ability of the ink on the surface of the printed matter, has a simple structure and a reasonable design, and can be well combined with the production line for use.

[0006] Technical Solution: The present invention provides a device for detecting the anti-friction ability of the surface of printed matter, including a base table, an upper pressure plate, a lower pressure plate, a conveyor belt, a first camera, a second camera, and an image analyzer. The lower pressure plate is horizontally arranged on the base table, and the upper pressure plate is arranged directly above the lower pressure plate and is parallel to it; the conveyor belt is located between the upper pressure plate and the lower pressure plate and is in close contact with the upper surface of the lower pressure plate; in the detection state, the distance between the upper pressure plate and the lower pressure plate is slightly greater than the thickness of the printed matter to be detected placed on the conveyor belt, and the upper surface of the printed matter to be detected is in effective contact with the lower surface of the upper pressure plate; the first camera and the second camera are respectively used to collect pictures of the upper surface of the printed matter to be detected before and after entering between the upper pressure plate and the lower pressure plate, and both are signal-connected to the image analyzer.

[0007] Furthermore, the device for detecting the anti-friction ability of the printed matter surface further includes a lifting mechanism for lifting the upper pressing plate. The lifting mechanism includes a guide rod and a cylinder. The guide rod is vertically fixed on the base platform. The upper pressing plate is sleeved on the guide rod. The cylinder is fixed on the base platform and its telescopic rod is vertically downward. The upper pressing plate is fixed at the bottom end of the telescopic rod of the cylinder. This device is usually used in conjunction with a printing production line. When this device is not needed for detection, or when maintenance operations such as overhauling this device are required, the upper pressing plate needs to be lifted. At this time, the upper pressing plate is lifted along the guide rod by the cylinder, so that it is separated from the printed matter to be detected below by a certain distance, which is convenient for shutdown maintenance or stopping detection.

[0008] Furthermore, the lifting mechanism further includes a return spring. The return spring is sleeved on the guide rod and is located between the lower pressing plate and the upper pressing plate. If the cylinder is damaged and unable to lift the upper pressing plate, the upper pressing plate can be supported and lifted by the return spring by a certain distance, so that it is separated from the printed matter to be detected below by a certain distance, which is convenient for shutdown maintenance or stopping detection.

[0009] Furthermore, the lifting mechanism further includes an adjusting nut. The upper pressing plate is threadedly connected to the cylinder through the adjusting nut. When it is necessary to detect printed matter to be detected with a relatively thick or thin thickness, it is necessary to increase or decrease the distance between the upper pressing plate and the lower pressing plate. Or when it is necessary to adjust the distance between the upper pressing plate and the lower pressing plate to increase or decrease the pressure on the printed matter to be detected between the two, the adjusting nut can be rotated so that when the cylinder presses down to the bottom, the distance between the upper pressing plate and the lower pressing plate increases or decreases, so that this device can be applicable to printed matter of different thicknesses or perform detection under different pressure conditions.

[0010] Preferably, the top of the adjusting nut is threadedly connected to the telescopic rod of the cylinder, and the bottom is threadedly connected to the top surface of the upper pressing plate.

[0011] Furthermore, the device for detecting the anti-friction ability of the printed matter surface further includes a waste rejection mechanism. The waste rejection mechanism includes a waste rejection cylinder and a waste rejection push plate. The waste rejection cylinder is fixed on the base platform, and its telescopic rod is perpendicular to the conveyor belt and is located above the conveyor belt. The waste rejection push plate is fixed at the end of the telescopic rod of the waste rejection cylinder. When the image analyzer analyzes that the ink on the surface of a certain printed matter to be detected is worn, when the printed matter to be detected is conveyed by the conveyor belt to be aligned with the waste rejection push plate, the telescopic rod of the waste rejection cylinder drives the waste rejection push plate to quickly extend to eject the waste product.

[0012] Furthermore, the waste rejection mechanism further includes a waste product groove. The waste product groove and the waste rejection cylinder are respectively arranged on both sides of the conveyor belt. The setting of the waste product groove is convenient for the waste rejection cylinder to eject and collect the waste products.

[0013] Furthermore, two rows of a number of pressing wheels along the length direction are respectively arranged on both sides of the conveyor belt, and both sides of the printed matter to be detected are respectively located between the two rows of pressing wheels and the conveyor belt. The arrangement of the pressing wheels can effectively prevent adjacent printed matters to be detected from overlapping and interlacing with each other due to the action of friction when entering between the upper pressing plate and the lower pressing plate, thus affecting the normal progress of detection.

[0014] Furthermore, the device for detecting the anti-friction ability of the surface of the printed matter further includes a vernier caliper installed perpendicular to the lower pressing plate. The setting of the vernier caliper provides a basis for adjusting the distance between the upper pressing plate and the lower pressing plate.

[0015] Furthermore, heating elements are installed in both the upper pressing plate and the lower pressing plate. A temperature sensor is also installed in the upper pressing plate, and a pressure sensor is also installed in the lower pressing plate. The pressure sensor and the temperature sensor are respectively connected to the temperature and pressure gauge. The heating element is used to heat the upper pressing plate and the lower pressing plate because a certain temperature is required when detecting the anti-friction ability of the ink; the temperature sensor is used to detect the temperature on the upper pressing plate and the lower pressing plate, and the pressure sensor is used to detect the pressure received by the lower pressing plate, so as to obtain the pressure between the upper pressing plate and the surface of the packaging box to be detected, facilitating the adjustment of this pressure; the temperature and pressure gauge can be an instrument that can receive the temperature and pressure signals fed back by the temperature sensor and the pressure sensor and display them. In order to improve the ability of automatic control, the temperature and pressure gauge can also have the function of a PLC controller. In this way, the PLC controller can be used to receive the temperature and pressure signals, and then feedback to control the heating situation of the heating element on the upper pressing plate, and give feedback to the user whether it is necessary to adjust the distance between the upper pressing plate and the lower pressing plate to adjust the pressure received by the lower pressing plate, so as to achieve stable and rapid control of temperature and pressure and realize accurate detection; the heating element can adopt commonly used heating instruments in the field, such as electric heating wires, etc.

[0016] Working principle and beneficial effects: When it is necessary to detect the anti-friction ability of the ink on the surface of a printed matter, first place the printed matter to be detected on the conveyor belt. Before the conveyor belt transports the printed matter to be detected between the upper pressure plate and the lower pressure plate, the first camera takes a photo of the upper surface of the printed matter to be detected and transmits the pre-detection photo to the image analyzer. Then, the operation of the conveyor belt transports the printed matter to be detected between the upper pressure plate and the lower pressure plate. Since the distance between the upper pressure plate and the lower pressure plate has been adjusted in advance, the friction force between the lower surface of the upper pressure plate and the upper surface of the printed matter to be detected is certain, and the pressure of the upper pressure plate on the printed matter to be detected is certain. When the conveyor belt transports the printed matter to be detected out from between the upper pressure plate and the lower pressure plate, the second camera takes a photo of the upper surface of the printed matter to be detected again and transmits the post-detection photo to the image analyzer. The image analyzer compares and analyzes the pre-detection photo and the post-detection photo. If the anti-friction ability of the ink on the upper surface of the printed matter to be detected is poor, the upper pressure plate will wear the ink on the upper surface of the printed matter to be detected. At this time, the comparison result between the pre-detection photo and the post-detection photo will differ greatly, indicating that the anti-friction ability of the ink is low. Otherwise, the anti-friction ability is strong. The analysis and comparison results of these anti-friction abilities will be transmitted to the user.

[0017] It can be seen that the present invention can detect the anti-friction ability of the ink printed on the printed matter through a simple structure. This device can be seamlessly connected to the production line and is suitable for large-scale production enterprises. Only by adding this device in the middle of the original production line and without modifying the original production line device can the detection be realized, which is very suitable for industrialization. Brief description of the drawings

[0018] Figure 1 It is a schematic structural diagram of the device for detecting the anti-friction ability of the surface of the printed matter in Embodiment 1;

[0019] Figure 2 It is a schematic structural diagram of the device for detecting the anti-friction ability of the surface of the printed matter in Embodiment 2;

[0020] Figure 3 It is a schematic structural diagram of the device for detecting the anti-friction ability of the surface of the printed matter in Embodiment 3.

[0021] 1 - base, 2 - upper pressure plate, 3 - lower pressure plate, 4 - conveyor belt, 5 - first camera, 6 - second camera, 7 - transmission motor, 8 - pressure sensor, 9 - heating element, 10 - temperature sensor, 11 - temperature and pressure gauge, 12 - printed matter to be detected, 13 - pressure wheel, 14 - waste rejection cylinder, 15 - waste rejection push plate, 16 - waste bin, 17 - guide rod, 18 - cylinder, 19 - return spring, 20 - adjusting nut, 21 - vernier caliper. Detailed implementation manners

[0022] The present invention will be described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1:

[0024] This embodiment provides a device for detecting the anti-friction ability of the surface of a printed matter, which mainly consists of a base 1, an upper pressing plate 2, a lower pressing plate 3, a conveyor belt 4, a first camera 5, a second camera 6, an image analyzer (preferably model LA-CM-08K08A-00-R), and a waste rejection mechanism. The lower pressing plate 3 is horizontally arranged on the base 1, and a pressure sensor 8 (preferably model PT124G-111) is installed inside the lower pressing plate 3. The upper pressing plate 2 is arranged directly above the lower pressing plate 3 and is parallel to it. A heating element 9 (preferably a resistance wire) and a temperature sensor 10 (preferably model PT100) are installed inside the upper pressing plate 2. The pressure sensor 8 and the temperature sensor 10 are respectively connected to a temperature and pressure gauge 11 (preferably model EVT-12N); the conveyor belt 4 is located between the upper pressing plate 2 and the lower pressing plate 3 and is in close contact with the upper surface of the lower pressing plate 3; in the detection state, the distance between the upper pressing plate 2 and the lower pressing plate 3 is slightly greater than the thickness of the printed matter 12 to be detected placed on the conveyor belt 4, and the upper surface of the printed matter 12 to be detected is in effective contact with the lower surface of the upper pressing plate 2; two rows of a number of pressing wheels 13 along its length direction are respectively arranged on both sides of the conveyor belt 4, and both sides of the printed matter 12 to be detected are respectively located between the two rows of pressing wheels 13 and the conveyor belt 4.

[0025] The first camera 5 and the second camera 6 are respectively used to collect pictures of the upper surface of the printed matter 12 to be detected before and after entering the upper pressing plate 2 and the lower pressing plate 3, and they are signal-connected to the image analyzer. The first camera 5 is arranged above the conveyor belt 4, on the left side of the upper pressing plate 2 and the lower pressing plate 3, and the second camera 6 is arranged above the conveyor belt 4, on the right side of the upper pressing plate 2 and the lower pressing plate 3. The waste rejection mechanism mainly consists of a waste rejection cylinder 14, a waste rejection push plate 15, and a waste bin 16. The waste rejection cylinder 14 is fixed on the base 1, and its telescopic rod is perpendicular to the conveyor belt 4 and is located above the conveyor belt 4. The waste rejection push plate 15 is fixed to the end of the telescopic rod of the waste rejection cylinder 14, and the waste bin 16 and the waste rejection cylinder 14 are respectively arranged opposite to each other on both sides of the conveyor belt 4.

[0026] The working principle of this device is as follows:

[0027] When it is necessary to detect the anti-friction ability of the ink on the surface of a printed matter, first place the printed matter 12 to be detected on the conveyor belt 4, and the printed matter 12 to be detected is pressed below by two rows of pressing wheels 13 on both sides. Through the conveyance of the conveyor motor 7, before the conveyor belt 4 transports the printed matter 12 to be detected between the upper pressing plate 2 and the lower pressing plate 3, the first camera 5 will take a photo of the upper surface of the printed matter 12 to be detected and transmit the pre-detection photo to the image analyzer; then the operation of the conveyor belt 4 transports the printed matter 12 to be detected between the upper pressing plate 2 and the lower pressing plate 3. Since the distance between the upper pressing plate 2 and the lower pressing plate 3 has been adjusted in advance, the friction force between the lower surface of the upper pressing plate 2 and the upper surface of the printed matter 12 to be detected is certain, and the pressure of the upper pressing plate 2 on the printed matter 12 to be detected is certain; when the conveyor belt 4 transports the printed matter 12 to be detected out from between the upper pressing plate 2 and the lower pressing plate 3, the second camera 6 takes a photo of the upper surface of the printed matter 12 to be detected again and transmits the post-detection photo to the image analyzer, and the image analyzer conducts a comparative analysis of the pre-detection photo and the post-detection photo; if the anti-friction ability of the ink on the upper surface of the printed matter 12 to be detected is poor, the upper pressing plate 2 will wear the ink on the upper surface of the printed matter 12 to be detected. At this time, the comparison result between the pre-detection photo and the post-detection photo will vary greatly, indicating that the anti-friction ability of the ink is low, otherwise the anti-friction ability is strong; if the printed matter to be detected with serious surface wear is detected, the image analyzer will transmit the analysis result to the controller, and the controller will control the waste rejection cylinder 14 in the waste rejection mechanism. When the printed matter 12 to be detected runs to face the waste rejection push plate 15, the waste rejection push plate 15 is pushed out by the extension of the telescopic rod of the waste rejection cylinder 14, so as to reject the waste product into the waste product trough 16 opposite.

[0028] Embodiment 2:

[0029] This embodiment is a further improvement of Embodiment 1. The main improvement lies in that this device is usually used in conjunction with a printing production line. When it is not necessary to use this device for detection, or when operations such as maintenance of this device are required, Embodiment 1 is inconvenient to operate. In this embodiment, a lifting mechanism for lifting the upper pressing plate 2 is further provided in the device. The lifting mechanism mainly consists of a guide rod 17, a cylinder 18, and a return spring 19. The guide rod 17 is vertically fixed on the base 1, the upper pressing plate 2 is sleeved on the guide rod 17, the cylinder 18 is fixed on the base 1 and its telescopic rod is vertically downward, and the upper pressing plate 2 is fixed at the bottom end of the telescopic rod of the cylinder 18; the return spring 19 is sleeved on the guide rod 17 and is located between the lower pressing plate 3 and the upper pressing plate 2.

[0030] When this device is not needed for detection in the production line, or when operations such as maintenance of this device are required, the upper pressing plate 2 needs to be lifted. At this time, the upper pressing plate 2 is lifted along the guide rod 17 by the air cylinder 18, so that it is separated from the printed matter 12 to be detected below by a certain distance, which is convenient for shutdown maintenance or stopping detection. If the air cylinder 18 is damaged and unable to lift the upper pressing plate 2, the upper pressing plate 2 can be supported and lifted by a certain distance through the return spring 19, so that it is separated from the printed matter 12 to be detected below by a certain distance, which is convenient for shutdown maintenance or stopping detection.

[0031] Except for this, this embodiment is exactly the same as Embodiment 1 and will not be elaborated here.

[0032] Embodiment 3:

[0033] This embodiment is a further improvement of Embodiment 2. The main improvement lies in that in Embodiment 2, when it is necessary to detect the printed matter 12 to be detected with a relatively thick or thin thickness, it is necessary to increase or decrease the distance between the upper pressing plate 2 and the lower pressing plate 3, or when it is necessary to adjust the distance between the upper pressing plate 2 and the lower pressing plate 3 to increase or decrease the pressure received by the printed matter 12 to be detected between the two, Embodiment 2 cannot be realized.

[0034] Moreover, the lifting mechanism of this embodiment further includes an adjusting nut 20 and a vernier caliper 21 installed perpendicular to the lower pressing plate 3. The upper pressing plate 2 is threadedly connected to the air cylinder 18 through the adjusting nut 20. The top of the adjusting nut 20 is threadedly connected to the telescopic rod of the air cylinder 18, and the bottom is threadedly connected to the top surface of the upper pressing plate 2.

[0035] When it is necessary to detect the printed matter 12 to be detected with a relatively thick or thin thickness, it is necessary to increase or decrease the distance between the upper pressing plate 2 and the lower pressing plate 3, or when it is necessary to adjust the distance between the upper pressing plate 2 and the lower pressing plate 3 to increase or decrease the pressure received by the printed matter 12 to be detected between the two, the adjusting nut 20 can be rotated so that when the air cylinder 18 presses down to the bottom, the distance between the upper pressing plate 2 and the lower pressing plate 3 increases or decreases, so that this device can be applicable to printed matters 12 to be detected with different thicknesses or perform detections under different pressure conditions; the setting of the vernier caliper 21 makes the adjustment of the distance between the upper pressing plate 2 and the lower pressing plate 3 well-founded.

[0036] Except for this, this embodiment is exactly the same as Embodiment 1 and will not be elaborated here.

[0037] The above embodiments are only for explaining the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. All equivalent transformations or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. An apparatus for detecting the anti-friction ability of the surface of a printed matter, characterized in that, It includes a base, an upper pressing plate, a lower pressing plate, a conveyor belt, a first camera, a second camera and an image analyzer. The lower pressing plate is horizontally arranged on the base, and the upper pressing plate is arranged directly above the lower pressing plate and parallel to it. The conveyor belt is located between the upper pressing plate and the lower pressing plate and is in close contact with the upper surface of the lower pressing plate. In the detection state, the distance between the upper pressing plate and the lower pressing plate is slightly larger than the thickness of the printed product to be detected placed on the conveyor belt, and the upper surface of the printed product to be detected is in effective contact with the lower surface of the upper pressing plate. The first camera and the second camera are respectively used to collect pictures of the upper surface of the printed product to be detected before and after entering between the upper pressing plate and the lower pressing plate, and both are signal-connected to the image analyzer. It also includes a waste rejection mechanism. The waste rejection mechanism includes a waste rejection cylinder and a waste rejection push plate. The waste rejection cylinder is fixed on the base, and its telescopic rod is perpendicular to the conveyor belt and located above the conveyor belt. The waste rejection push plate is fixed at the end of the telescopic rod of the waste rejection cylinder. Two rows of a number of pressing wheels along its length direction are respectively arranged on both sides of the conveyor belt. Both sides of the printed product to be detected are respectively located between the two rows of pressing wheels and the conveyor belt. Heating elements are installed in both the upper pressing plate and the lower pressing plate. A temperature sensor is also installed in the upper pressing plate, and a pressure sensor is installed in the lower pressing plate. It also includes a temperature and pressure gauge, and the pressure sensor and the temperature sensor are respectively connected to the temperature and pressure gauge.

2. The device for detecting the anti-friction ability of the surface of a printed matter according to claim 1, wherein It also includes a lifting mechanism for lifting the upper pressing plate. The lifting mechanism includes a guide rod and a cylinder. The guide rod is vertically fixed on the base, and the upper pressing plate is sleeved on the guide rod. The cylinder is fixed on the base and its telescopic rod is arranged vertically downward. The upper pressing plate is fixed at the bottom end of the telescopic rod of the cylinder.

3. The device for detecting the anti-friction ability of the surface of a printed matter according to claim 2, characterized in that, The lifting mechanism also includes a return spring. The return spring is sleeved on the guide rod and is located between the lower pressing plate and the upper pressing plate.

4. The device for detecting the anti-friction ability of the surface of a printed matter according to claim 2, wherein, The lifting mechanism also includes an adjusting nut. The upper pressing plate is threadedly connected to the cylinder through the adjusting nut.

5. The device for detecting the anti-friction ability of the printed matter surface according to claim 4, characterized in that, The top of the adjusting nut is threadedly connected to the telescopic rod of the cylinder, and the bottom is threadedly connected to the top surface of the upper pressing plate.

6. The device for detecting the anti-friction ability of the surface of a printed matter according to claim 1, characterized in that, The waste rejection mechanism also includes a waste product slot. The waste product slot and the waste rejection cylinder are respectively arranged on both sides of the conveyor belt opposite to each other.

7. The device for detecting the anti-friction ability of the surface of a printed matter according to any one of claims 1-6, characterized in that, It also includes a vernier caliper installed perpendicular to the lower pressing plate.

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