A label paper inversion detection device and detection method

Abstract

The present invention discloses a device and method for detecting inverted label paper. The device comprises a support assembly and a detection assembly. A first fixed block and a second fixed block in the support assembly slide left and right via a sliding assembly. The detection assembly comprises a fiber optic sensor, a signal amplifier, and an absolute value encoder. One side of the signal amplifier is connected to the fiber optic sensor, and the received luminous flux is proportional to the value of the signal amplifier. The first channel of the signal amplifier is used to output a label paper inversion signal and transmit it to a data processing device. The absolute value encoder is used to record the phase of the label paper on the positioning platform in real time. The data processing device is used to output a rejection signal and a shutdown signal to the original machine control. The present invention not only enables adjustment of the various positions of the detection assembly, thereby improving the detection effect, but also, by using the detection assembly to determine whether the label paper is inverted and whether the fiber optic sensor itself is dirty, it achieves higher detection accuracy and avoids manual operation.

Description

Technical Field

[0001] The present invention relates to the field of tobacco processing, and in particular to a device and method for detecting inversion of trademark paper. Background Art

[0002] During tobacco processing, soft pack cigarette packs need to be packaged at high speed. This is mainly done by using the control system in the original packaging equipment (hereinafter referred to as the original machine control) to first apply glue to the label paper and then attach it to the cigarette packs one by one.

[0003] Traditional methods of conveying and folding trademark paper are mainly divided into pre-cut and roll types. When pre-cut trademark paper is used, in order to achieve better folding effect of trademark paper packaging, the edges of the trademark paper are pre-cut. However, during the folding of trademark packaging, due to factors such as incoming materials and human errors, the trademark paper will inevitably be inverted. At present, traditional packaging equipment mainly relies on visual inspection devices to check the appearance quality of cigarette packs. However, in actual production, the appearance quality inspection of cigarette packs cannot accurately and reliably identify inverted cigarette packs, and the inspection space is small. The appearance quality inspection device cannot be better arranged according to actual use, resulting in inverted cigarette packs flowing into subsequent processes, and this quality defect cannot be avoided by manual judgment, resulting in serious quality accidents and a high market feedback rate. Summary of the Invention

[0004] The present invention provides a trademark paper inversion detection device and a detection method thereof, which have a simple structure and can not only adjust the positions of the detection components to achieve a better detection effect, but also detect whether the trademark paper is inverted and whether the optical fiber sensor is dirty through the detection components, avoiding manual operation and improving efficiency.

[0005] To achieve the above-mentioned purpose, the present invention provides a device and method for detecting inversion of trademark paper, comprising a limiting component;

[0006] The limiting assembly includes a first fixing plate and a second fixing plate spaced apart and arranged behind the first fixing plate. A horizontal positioning platform is provided between the first fixing plate and the second fixing plate. The label paper is moved from the top to the positioning platform by the original machine control.

[0007] Also includes a support assembly and a detection assembly;

[0008] The support assembly includes a first fixed block and a second fixed block, the first fixed block is arranged on the first fixed plate, the second fixed block is located on one side of the first fixed block and slides left and right through the sliding assembly;

[0009] The detection assembly includes an optical fiber sensor, a signal amplifier and an absolute value encoder. The optical fiber sensor is disassembled and installed on the second fixed block, and its detection end passes through the through hole on the first fixed block and faces the upper surface of the positioning platform;

[0010] One side of the signal amplifier is connected to the optical fiber sensor and the received light flux is proportional to the value of the signal amplifier. The first channel of the signal amplifier is used to output the label paper inversion signal and transmit it to the data processing device;

[0011] The absolute value encoder is synchronized with the original machine encoder on the original machine control and is connected to the data processing device for real-time recording of the phase of the label paper on the positioning platform;

[0012] The data processing device is used to output a rejection signal and a shutdown signal to the original machine control.

[0013] Furthermore, the signal amplifier is of a dual-channel digital output type, and its second channel is used to output the fiber optic sensor dirt self-detection signal and transmit it to the data processing device;

[0014] The data processing device outputs an alarm signal to the original machine control.

[0015] Furthermore, it also includes a touch display screen, which is electrically connected to the data processing device and is used to set the trademark paper inversion detection phase interval, the optical fiber sensor dirt self-detection phase, function opening and closing, fault alarm display and reset.

[0016] Furthermore, a cleaning assembly is included, wherein the cleaning assembly includes an air pump, a nozzle and a telescopic hose;

[0017] The first fixing block is provided with first through holes arranged on the left and right sides, the second fixing block is provided with an air vent and a second through hole coaxial with the first through hole and closed at the left end, the air vent is connected to the second through hole and a nozzle is provided on the side facing the optical fiber sensor;

[0018] The right end of the first through hole is connected to the air pump, and the telescopic hose is connected between the first through hole and the second through hole.

[0019] Furthermore, the sliding assembly includes a connecting block, the first fixed block is provided with T-shaped slot holes arranged on the left and right, the left end of the connecting block is fixedly connected to the second fixed block, and the right end matches the slot hole structure and is slidably arranged therein, and the first locking pin is threadedly installed on the first fixed block and supports the connecting block.

[0020] Furthermore, the support assembly further includes a positioning screw, which first passes through the first fixing block and is then threadedly mounted on the first fixing plate;

[0021] The second fixing block is provided with a positioning hole, the optical fiber sensor is disassembled and sleeved into the positioning hole, and is fixed by the second locking pin thread.

[0022] Furthermore, the first fixing plate is provided with upper and lower strip blocks, the first fixing block is provided with a slot and is slidably mounted on the outside of the strip block, and the positioning screw is threadedly mounted on the first fixing plate and supports the strip block.

[0023] A method for detecting inversion of trademark paper comprises the following steps:

[0024] a. Calibrate the position of the absolute encoder and the encoder on the original machine control to make the phase degree of the absolute encoder consistent with the phase degree of the encoder on the original machine control;

[0025] b. Manually start the original machine control, causing the label paper to descend to the positioning platform. The absolute encoder records the start phase A and end phase B of the label paper's resting position on the positioning platform. AB is the detection phase interval for the label paper's inversion. The fiber optic sensor senses the label paper, and the signal amplifier records the minimum and maximum readings in the AB phase interval.

[0026] c. Continue to manually start the original machine control, remove the label paper from the positioning platform, so that the front side of the optical fiber sensor is unobstructed and facing the positioning platform. Use the absolute encoder to record the phase reading as C. Phase C is the phase point of the optical fiber sensor's dirt self-detection. The signal amplifier records the value of this phase point.

[0027] d. Set the threshold value for detecting inverted label paper in the first channel of the signal amplifier and the threshold value for detecting dirtiness of the optical fiber sensor in the second channel;

[0028] e. Automatically start the original machine control, drive the label paper to be placed on the positioning platform, and the absolute value encoder records the position phase of the label paper. When it is in the detection phase interval AB of the label paper inversion, the optical fiber sensor senses the label paper. If the signal value received by the signal amplifier is greater than the label paper inversion detection threshold value, it indicates that the label paper is not inverted and the original machine control is operating normally;

[0029] If the signal value is less than the label paper inversion detection threshold, it means that the label paper is inverted. The data processing device sends a rejection signal to the original machine control, and the original machine control removes the inverted label paper from the positioning platform. If the label paper is inverted three or more times in a row, the data processing device sends a stop signal to the original machine control, and the original machine control stops and issues a red alarm signal.

[0030] Therefore, the detection of the inversion of the trademark paper is completed;

[0031] f. When in the contamination self-detection phase point, if the signal value received by the signal amplifier is greater than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a contamination state. The data processing device sends an alarm signal to the original machine control, which takes alarm action and displays a yellow alarm signal on the touch screen. If the signal value received by the signal amplifier is less than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a clean state and the original machine control is operating normally.

[0032] Therefore, the detection of contamination of the optical fiber sensor is completed;

[0033] g. During the period from entering to leaving the positioning platform, the label paper undergoes an inversion detection and the optical fiber sensor performs a dirt self-check. After the inversion detection is completed, the label paper is controlled by the original machine to the next process, and the original machine controls the next label paper to enter the positioning platform and continue the inversion detection. In addition, the cleaning component continues to work, so that clean air continues to blow and clean the optical fiber sensor.

[0034] Furthermore, before detecting the inversion of the trademark paper in step e, the trademark paper gluing detection is started, and the gluing signal is electrically isolated and connected to the data processing device through high-speed optical coupler 3. When it is detected that there is glue on the trademark paper, the data processing device will enable the inversion detection of the trademark paper after receiving the gluing signal; when it is detected that there is no glue on the trademark paper, the data processing device does not receive the gluing signal and turns off the inversion detection of the trademark paper.

[0035] Furthermore, in step b, at phase region AB, the lowest value read by the signal amplifier is N1 and the highest value is N3. In step c, at phase point C, the signal amplifier records the value N2 at that phase point.

[0036] In step d, the threshold value for detecting the inverted label paper of the first channel of the signal amplifier is (N1+N3) / 2, and the threshold value for detecting the dirtiness of the optical fiber sensor of the second channel is (N1+N2) / 4.

[0037] Compared with the prior art, the present invention provides a device for detecting inverted trademark paper. On the one hand, the first fixed block and the second fixed block are connected by a sliding assembly, thereby enabling the optical fiber sensor to be adjusted in the left and right directions. On the other hand, the optical fiber sensor is mounted in a positioning hole on the second fixed block and aligned with the positioning platform, thereby enabling the optical fiber sensor to be adjusted up and down. Thus, by adjusting the position of the optical fiber sensor, its detection effect is more accurate. Due to the provision of a cleaning assembly, an air pump passes air through the first through hole, the connecting hose, and the second through hole to continuously blow air to the optical fiber sensor, thereby ensuring the cleanliness of the optical fiber sensor and preventing dirt from affecting the detection effect.

[0038] This method for detecting inverted label paper uses an absolute value encoder synchronized with the original machine encoder to record the phase of the label paper on the positioning platform in real time. The phase interval for detecting inverted label paper and the phase for self-detection of dirtiness of the optical fiber sensor are set accordingly. The optical fiber sensor performs sensing detection, and a signal amplifier generates a signal value. The signal is then compared with the set threshold values ​​for detecting inverted label paper and self-detection of dirtiness of the optical fiber sensor to determine whether the label paper is inverted or whether the optical fiber sensor is dirty. This makes detection more accurate and avoids false detection and incorrect rejection of label paper.

[0039] The present device and method for detecting inverted label paper not only realizes adjustment of various positions of the detection components to achieve better detection results, but also uses the detection components to detect whether the label paper is inverted and whether the optical fiber sensor is dirty, thereby achieving higher detection accuracy and avoiding manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is an overall schematic diagram of the detection device of the present invention;

[0041] Figure 2 is a schematic diagram of a support assembly of the present invention;

[0042] Figure 3 is a schematic diagram of a first fixing plate of the present invention;

[0043] Figure 4 It is a schematic diagram of the detection component of the present invention;

[0044] Figure 5 is a flow chart of the detection method of the present invention;

[0045] Figure 6 This is a schematic diagram of the trademark paper of the present invention when it is not inverted;

[0046] Figure 7 This is a schematic diagram of the trademark paper of the present invention when it is inverted;

[0047] In the figure: 11. First fixing plate, 12. Through hole, 13. Positioning platform, 14. Second fixing plate, 2. First fixing block, 21. First through hole, 22. Slotted hole, 23. First locking pin, 24. Positioning screw, 3. Second fixing block, 31. Second through hole, 32. Vent hole, 33. Second locking pin, 4. Detection assembly, 5. Connecting block, 6. Telescopic hose. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings.

[0049] like Figure 1 、 Figure 3 、 Figure 4 As shown, the present invention relates to a device for detecting inverted label paper, comprising a limiting component;

[0050] The limiting assembly includes a first fixing plate 11 and a second fixing plate 14 spaced apart and arranged behind the first fixing plate 11. A horizontally arranged positioning platform 13 is provided between the first fixing plate 11 and the second fixing plate 14. The trademark paper is moved from the top to the positioning platform 13 by the original machine control.

[0051] Also includes a support assembly and a detection assembly 4;

[0052] The support assembly includes a first fixed block 2 and a second fixed block 3. The first fixed block 2 is arranged on the first fixed plate 11. The second fixed block 3 is located on one side of the first fixed block 2 and slides left and right through the sliding assembly.

[0053] The detection assembly 4 includes a fiber optic sensor, a signal amplifier, and an absolute value encoder. The fiber optic sensor is disassembled and mounted on the second fixed block 3, with its detection end passing through the through hole 12 on the first fixed block 2 and facing the upper end surface of the positioning platform 13;

[0054] One side of the signal amplifier is connected to the optical fiber sensor and the received light flux is proportional to the value of the signal amplifier. The first channel of the signal amplifier is used to output the label paper inversion signal and transmit it to the data processing device;

[0055] The absolute value encoder is synchronized with the original machine encoder on the original machine control and is connected to the data processing device for real-time recording of the phase of the label paper on the positioning platform 13;

[0056] The data processing device can be a Siemens PLC, which is used to output a rejection signal and a shutdown signal to the original machine control. The rejection signal is electrically isolated and connected to the original machine control through a high-speed optocoupler 1, and the shutdown signal is electrically isolated and connected to the original machine control system through a high-speed optocoupler 2.

[0057] Furthermore, the signal amplifier is a dual-channel digital output type, and its second channel is used to output the fiber optic sensor dirt self-detection signal and transmit it to the data processing device; the data processing device outputs an alarm signal to the original machine control.

[0058] Furthermore, it also includes a touch screen display, which is electrically connected to the data processing device and is used to set the phase interval for detecting the inversion of the trademark paper, the phase for the self-detection of dirtiness of the optical fiber sensor, function on and off, fault alarm display and reset;

[0059] like Figure 2 、 Figure 3 As shown, further, the first fixing block 2 can be directly fixed on the first fixing plate 11, for example, the positioning screw 24 first passes through the first fixing block 2 and is then threadedly installed on the first fixing plate 11;

[0060] The second fixing block 3 is provided with a positioning hole, and the optical fiber sensor is disassembled and sleeved into the positioning hole and is fixed by the second locking pin 33;

[0061] Another solution is that the first fixing plate 11 is provided with strip blocks arranged up and down, and the first fixing block 2 is slidably arranged on the strip block up and down, that is, the first fixing block 2 is provided with a slot and is slidably mounted on the outside of the strip block up and down, and the positioning screw 24 is threadedly installed on the first fixing plate 11 and supports the strip block;

[0062] Therefore, by sliding the first fixing block 2 up and down on the first fixing plate 11, the detection assembly 4 is adjusted so that it is aligned with the upper end surface of the positioning platform 13;

[0063] Furthermore, the sliding assembly includes a connecting block 5, and the first fixed block 2 is provided with T-shaped slots 22 arranged on the left and right. The left end of the connecting block 5 is fixedly connected to the second fixed block 3, and the right end matches the slot 22 structure and is slidably arranged therein. The first locking pin 23 is threadedly installed on the first fixed block 2 and supports the connecting block 5;

[0064] Furthermore, the device further comprises a cleaning component, which sprays air onto one side of the optical fiber sensor;

[0065] As a solution, the cleaning assembly is directly mounted on the second fixing block 3, and its nozzle is aimed at one side of the optical fiber sensor;

[0066] As another solution, the cleaning assembly includes an air pump, a nozzle and a telescopic hose 6;

[0067] The first fixing block 2 is provided with first through holes 21 arranged on the left and right sides, and the second fixing block 3 is provided with an air vent 32 and a second through hole 31 which is coaxial with the first through hole 21 and closed at the left end. The air vent 32 is connected to the second through hole 31 and a nozzle is provided on the side facing the optical fiber sensor.

[0068] The right end of the first through hole 21 is connected to the air pump, and the telescopic hose 6 is connected between the first through hole 21 and the second through hole 31;

[0069] like Figure 5 As shown, when the inverted label paper detection device is used, the support assembly is installed on the first fixed plate 11. The original machine controls the label paper to undergo a gluing process first, enter between the first fixed plate 11 and the second fixed plate 14, and be supported by the positioning platform 13;

[0070] Before the detection is started, the position of the optical fiber sensor in the detection component 4 can be calibrated so that its detection end is directly above the positioning platform 13. On the one hand, the optical fiber sensor is set in the positioning hole on the second fixing block 3 and can be adjusted up and down and locked and fixed by the second locking pin 33. On the other hand, the first fixing block 2 and the second fixing block 3 are connected by a sliding component to realize the adjustment of the optical fiber sensor in the left and right directions. Therefore, by adjusting the position of the optical fiber sensor, its detection effect is better.

[0071] like Figure 5 、 Figure 6 、 Figure 7 As shown, the label paper is placed on the positioning platform 13 through the original machine control. When the label paper placed on the positioning platform 13 is not inverted, that is, the cut corner is located at the upper end of the label paper, the optical fiber sensor transmits a signal to the signal amplifier, and the signal amplifier outputs a high level to the data processing device through the first channel, indicating that the label paper is not inverted. When the label paper placed on the positioning platform 13 is inverted, that is, the cut corner is located at the lower end of the label paper, the optical fiber sensor detects and transmits a signal to the signal amplifier, and the signal amplifier outputs a low level to the data processing device through the first channel, indicating that the label paper is inverted.

[0072] When the label paper is not inverted, normal subsequent packaging and other processes are carried out. When the label paper is inverted, the data processing device sends a signal to the original machine control through the high-speed optical coupler 1, and outputs a rejection signal to reject the inverted label paper. Preferably, when the label paper is inverted three times in a row, the data processing device sends a signal to the original machine control through the high-speed optical coupler 2, and outputs a stop signal.

[0073] In addition, when the optical fiber sensor becomes dirty, such as dust that affects the detection effect, the optical fiber sensor transmits the signal to the signal amplifier. The signal amplifier outputs a high level to the data processing device through the second channel, indicating that the optical fiber sensor is dirty. If a low level is output to the data processing device, it indicates that the optical fiber sensor is not dirty.

[0074] The absolute value encoder is synchronized with the original encoder on the original machine control and is connected to the data processing device. It is used to record the phase of the label paper on the positioning platform 13 in real time, which facilitates the judgment of various output signals. The touch screen is electrically connected to the data processing device and is used to set the phase interval for detecting the inversion of the label paper, the phase of the optical fiber sensor's dirt self-detection, and to turn functions on and off, and to display fault alarms and reset them.

[0075] The present invention provides a method for detecting inversion of trademark paper, which specifically comprises the following steps:

[0076] a. Calibrate the position of the absolute encoder and the encoder on the original machine control to make the phase degree of the absolute encoder consistent with the phase degree of the encoder on the original machine control;

[0077] b. Manually activate the original machine control, causing the label paper to descend onto positioning platform 13. An absolute encoder is used to record the start phase A and end phase B of the label paper's resting position on positioning platform 13. AB is the detection phase interval for the label paper's inversion. The optical fiber sensor senses the label paper, and a signal amplifier records the minimum and maximum readings in the AB phase interval.

[0078] c. Continue to manually start the original machine control, the trademark paper is separated from the positioning platform 13, so that the front side of the optical fiber sensor is unobstructed and facing the positioning platform 13, and the phase reading is recorded by the absolute encoder as C. Phase C is the phase point of the optical fiber sensor self-test for contamination, and the signal amplifier records the value of the phase point;

[0079] d. Set the threshold value for detecting inverted label paper in the first channel of the signal amplifier and the threshold value for detecting dirtiness of the optical fiber sensor in the second channel;

[0080] e. Automatically start the original machine control, drive the label paper to be placed on the positioning platform 13, and the absolute value encoder records the position phase of the label paper. When it is in the detection phase interval AB of the label paper inversion, the optical fiber sensor senses the label paper. If the signal value received by the signal amplifier is greater than the label paper inversion detection threshold value, it indicates that the label paper is not inverted and the original machine control is operating normally;

[0081] If the signal value is less than the label paper inversion detection threshold, it indicates that the label paper is inverted. The data processing device sends a rejection signal to the original machine control, and the original machine control removes the inverted label paper from the positioning platform 13. If the label paper is inverted three or more times in a row, the data processing device sends a stop signal to the original machine control, and the original machine control stops and issues a red alarm signal.

[0082] Therefore, the detection of the inversion of the trademark paper is completed;

[0083] f. When in the contamination self-detection phase point, if the signal value received by the signal amplifier is greater than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a contamination state. The data processing device sends an alarm signal to the original machine control, which takes alarm action and displays a yellow alarm signal on the touch screen. If the signal value received by the signal amplifier is less than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a clean state and the original machine control is operating normally.

[0084] Therefore, the detection of contamination of the optical fiber sensor is completed;

[0085] g. During the period from entering to leaving the positioning platform 13, the label paper undergoes an inversion detection and the optical fiber sensor performs a dirt self-check. After the inversion detection is completed, the label paper is controlled by the original machine to the next process, and the original machine controls the next label paper to enter the positioning platform 13 and continue the inversion detection. The cycle continues; the cleaning component continues to work, so that clean air continues to blow and clean the optical fiber sensor.

[0086] Furthermore, in step b, at phase region AB, the lowest value read by the signal amplifier is N1 and the highest value is N3. In step c, at phase point C, the signal amplifier records the value N2 at that phase point.

[0087] In step d, the threshold value for detecting the inverted label paper of the first channel of the signal amplifier is (N1+N3) / 2, and the threshold value for detecting the dirtiness of the optical fiber sensor of the second channel is (N1+N2) / 4;

[0088] Furthermore, before checking whether the label paper is inverted in step e, the label paper's gluing may be checked. The output label paper gluing operation signal is electrically isolated and connected to the data processing device via a high-speed optical coupler 3, and serves as a label paper inversion detection enabling signal. That is, when the label paper is detected to have gluing, the label paper is controlled by the original machine to move onto the positioning platform 13. If no gluing is detected, the label paper inversion detection is not activated and is in a disabled state.

[0089] The method for detecting inverted trademark paper can effectively detect whether the trademark paper is inverted and whether the optical fiber sensor is dirty, thereby avoiding manual operation and realizing automation, which is more efficient and reliable.

Claims

1. A label paper inversion detection device, comprising a limit assembly; The limiting assembly comprises a first fixing plate (11) and a second fixing plate (14) spaced apart and arranged at the rear side of the first fixing plate (11); a horizontally arranged positioning platform (13) is provided between the first fixing plate (11) and the second fixing plate (14); and the trademark paper is moved from the top to the positioning platform (13) by the original machine control; It is characterized in that Also included are a support assembly and a detection assembly (4); The support assembly comprises a first fixed block (2) and a second fixed block (3), wherein the first fixed block (2) is arranged on a first fixed plate (11), and the second fixed block (3) is located on one side of the first fixed block (2) and slides left and right via a sliding assembly; The detection assembly (4) includes an optical fiber sensor, a signal amplifier, and an absolute value encoder. The optical fiber sensor is detachably mounted on the second fixed block (3), with its detection end passing through the through hole (12) on the first fixed block (2) and facing the upper end surface of the positioning platform (13); One side of the signal amplifier is connected to the optical fiber sensor and the received light flux is proportional to the value of the signal amplifier. The first channel of the signal amplifier is used to output the label paper inversion signal and transmit it to the data processing device; The absolute value encoder is synchronized with the original machine encoder on the original machine control and is connected to the data processing device to record the phase of the trademark paper on the positioning platform (13) in real time; The data processing device is used to output a rejection signal and a shutdown signal to the original machine control; The second fixing block (3) is provided with a positioning hole, the optical fiber sensor is disassembled and sleeved in the positioning hole, and is screwed and fixed by a second locking pin (33); The signal amplifier is a dual-channel digital output type, and its second channel is used to output the fiber optic sensor dirt self-detection signal and transmit it to the data processing device; The data processing device outputs an alarm signal to the original machine control; Also included is a cleaning assembly, which includes an air pump, a nozzle and a telescopic hose (6); The trademark paper is placed on the positioning platform (13) through the original machine control. When the trademark paper placed on the positioning platform (13) is not inverted, that is, the cut corner is located at the upper end of the trademark paper, the optical fiber sensor transmits a signal to the signal amplifier, and the signal amplifier outputs a high level to the data processing device through the first channel, which indicates that the trademark paper is not inverted. When the trademark paper placed on the positioning platform (13) is inverted, that is, the cut corner is located at the lower end of the trademark paper, the optical fiber sensor detects and transmits a signal to the signal amplifier, and the signal amplifier outputs a low level to the data processing device through the first channel, which indicates that the trademark paper is inverted.

2. The device for detecting inverted label paper according to claim 1, characterized in that: It also includes a touch display screen, which is electrically connected to the data processing device and is used to set the trademark paper inversion detection phase interval, the optical fiber sensor dirt self-detection phase, function opening and closing, fault alarm display and reset.

3. The device for detecting inverted label paper according to any one of claims 1 to 2, characterized in that: The first fixing block (2) is provided with first through holes (21) arranged on the left and right sides, the second fixing block (3) is provided with an air vent (32) and a second through hole (31) coaxial with the first through hole (21) and closed at the left end, the air vent (32) is communicated with the second through hole (31) and a nozzle is provided on the side facing the optical fiber sensor; The right end of the first through hole (21) is connected to the air pump, and the telescopic hose (6) is communicated between the first through hole (21) and the second through hole (31).

4. The device for detecting inverted label paper according to claim 3, characterized in that: The sliding assembly comprises a connecting block (5), the first fixed block (2) is provided with T-shaped slots (22) arranged on the left and right, the left end of the connecting block (5) is fixedly connected to the second fixed block (3), and the right end matches the slot (22) structure and is slidably arranged therein, and the first locking pin (23) is threadedly mounted on the first fixed block (2) and supports the connecting block (5).

5. The device for detecting inverted label paper according to claim 4, characterized in that: The support assembly further comprises a positioning screw (24), which first passes through the first fixing block (2) and is then threadedly mounted on the first fixing plate (11).

6. The device for detecting inverted label paper according to claim 4, characterized in that: The first fixing plate (11) is provided with strip blocks arranged up and down, the first fixing block (2) is provided with a slot and is slidably mounted on the outside of the strip block, and the positioning screw (24) is threadedly mounted on the first fixing plate (11) and supports the strip block.

7. A method for detecting inversion of trademark paper, characterized in that: The device for detecting inverted label paper according to any one of claims 1 to 6 specifically comprises the following steps: a. Calibrate the position of the absolute encoder and the encoder on the original machine control to make the phase degree of the absolute encoder consistent with the phase degree of the encoder on the original machine control; b. Manually start the original machine control so that the trademark paper descends to the positioning platform (13). The absolute value encoder records the starting phase A and the ending phase B of the trademark paper when it is stationary on the positioning platform (13). AB is the detection phase interval for the inversion of the trademark paper. The optical fiber sensor senses the trademark paper and the signal amplifier records the minimum and maximum values ​​of the AB phase zone readings. c. Continue to manually start the original machine control, the trademark paper is separated from the positioning platform (13), so that the front side of the optical fiber sensor is unobstructed and faces the positioning platform (13), and the phase reading is recorded as C by the absolute encoder. Phase C is the optical fiber sensor dirty self-test phase point, and the signal amplifier records the value of the phase point; d. Set the threshold value for detecting inverted label paper in the first channel of the signal amplifier and the threshold value for detecting dirtiness of the optical fiber sensor in the second channel; e. Automatically start the original machine control, drive the label paper to be placed on the positioning platform (13), and the absolute value encoder records the position phase of the label paper. When it is in the detection phase interval AB of the label paper inversion, the optical fiber sensor senses the label paper. If the signal value received by the signal amplifier is greater than the label paper inversion detection threshold value, it means that the label paper is not inverted and the original machine control is operating normally; If the signal value is less than the trademark paper inversion detection threshold value, it indicates that the trademark paper is inverted, and the data processing device sends a rejection signal to the original machine control, and the original machine control removes the inverted trademark paper from the positioning platform (13). When the trademark paper is inverted three or more times in a row, the data processing device sends a stop signal to the original machine control, and the original machine control performs a stop action and sends a red alarm signal. Therefore, the detection of the inversion of the trademark paper is completed; f. When in the contamination self-detection phase point, if the signal value received by the signal amplifier is greater than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a contamination state. The data processing device sends an alarm signal to the original machine control, which takes alarm action and displays a yellow alarm signal on the touch screen. If the signal value received by the signal amplifier is less than the contamination self-detection threshold value, it indicates that the optical fiber sensor is in a clean state and the original machine control is operating normally. Therefore, the detection of contamination of the optical fiber sensor is completed; g. During the period from entering to leaving the positioning platform (13), the trademark paper is subjected to an inversion detection and the optical fiber sensor is subjected to a dirt self-detection. After the inversion detection of the trademark paper is completed, the trademark paper is controlled by the original machine to the next process, and the original machine control drives the next trademark paper to enter the positioning platform (13) to continue the inversion detection; and the cleaning component continues to work, so that clean air is continuously blown to clean the optical fiber sensor.

8. The method for detecting inversion of trademark paper according to claim 7, characterized in that: Before detecting the inversion of the trademark paper in step e, the trademark paper gluing detection is activated. The gluing signal is electrically isolated and connected to the data processing device through high-speed optical coupler 3. When the presence of glue on the trademark paper is detected, the data processing device will enable the inversion detection of the trademark paper after receiving the gluing signal. When the presence of glue on the trademark paper is detected, the data processing device does not receive the gluing signal and disables the inversion detection of the trademark paper.

9. The method for detecting inversion of trademark paper according to claim 7, characterized in that: In step b, when the phase is in the AB region, the lowest value read by the signal amplifier is N1 and the highest value is N3. In step c, when the phase is at point C, the signal amplifier records the value N2 at that phase point. In step d, the threshold value for detecting the inverted label paper of the first channel of the signal amplifier is (N1+N3) / 2, and the threshold value for detecting the dirtiness of the optical fiber sensor of the second channel is (N1+N2) / 4.

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