Continuous extraction detection system and detection method for soft extraction paper cutting machine

Abstract

The invention discloses a continuous extraction detection system and method for a soft extraction paper cutting machine. The continuous extraction detection system comprises a rack and a movable cutter shaft roller, the movable cutter shaft roller is provided with a plurality of movable cutters, and the two ends of the movable cutter shaft roller are rotationally installed on the rack; the fixed cutter shaft roller is provided with at least one fixed cutter, the two ends of the fixed cutter shaft roller are in insulation connection with the support, and the fixed cutter shaft roller and the movable cutter shaft roller are electrified at low voltage; the signal acquisition module comprises a cutter contact signal detection unit, a signal noise anti-interference isolation unit and an angle detection unit; and the central processing module comprises a central processing unit, and the central processing unit is used for receiving the signals acquired by the signal acquisition module, judging the tangent state of the fixed cutter and the movable cutter according to the acquired signals, and outputting an alarm signal according to the tangent state. The continuous extraction detection and judgment of the soft extraction paper cutting machine are realized, the cutting effect of the current soft extraction paper can be timely and accurately judged, an enterprise is helped to reduce waste paper and waste materials, the working efficiency is improved, and the labor intensity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of quality inspection of soft tissue paper products, and particularly relates to a continuous paper detection system and a detection method for a soft tissue paper cutting machine. Background Art

[0002] The soft tissue paper cutting machine shears the tissue paper through a spiral cutter body and processes the cut tissue paper into an interleaved folded facial tissue. During the production process, there is a situation where the paper knife does not completely cut the paper, resulting in a small part of the paper edges sticking together. The quality of the folded paper after cutting can only be manually inspected regularly, such as whether there is continuous paper, torn edges, etc. Such repetitive processes not only increase the labor intensity but also generate a considerable amount of waste paper. If the continuous paper fault phenomenon is not detected in time, it will also cause rework, product scrapping, waste of raw materials, high energy consumption, and large operating randomness and risks.

[0003] In response to the above problems, the Chinese utility model patent with the publication number CN220699762U discloses a tissue paper cutting mechanism. By detecting the on-off of the control circuit, it can be known whether the fixed knife and the rotating blade are in contact, and the fault can be immediately known and processed in time, reducing the time required for maintenance and improving work efficiency. However, only using the method of detecting the on-off of the control circuit cannot accurately determine whether the cutting knife of the cutting machine completely cuts the paper, and the interference signal of detecting the on-off of the control circuit will affect the detection result. Therefore, in order to avoid the disadvantages existing in the prior art, it is necessary to improve the prior art. Summary of the Invention

[0004] The purpose of the present invention is to overcome the disadvantages and deficiencies in the prior art and provide a continuous paper detection system for a soft tissue paper cutting machine with high detection accuracy and fast response speed.

[0005] The purpose of the present invention also lies in providing a continuous paper detection method for a soft tissue paper cutting machine.

[0006] The present invention is realized through the following technical solutions: A continuous paper detection system for a soft tissue paper cutting machine includes

[0007] A frame;

[0008] A moving knife shaft roller, provided with a plurality of moving knives, and both ends of the moving knife shaft roller are rotatably installed on the frame;

[0009] A fixed knife shaft roller, provided with at least one fixed knife, and both ends of the fixed knife shaft roller are fixedly installed on the frame. Both ends of the fixed knife shaft roller are insulated from the bracket, and a low voltage is applied between the fixed knife shaft roller and the moving knife shaft roller;

[0010] The signal acquisition module includes a cutter contact signal detection unit, a signal noise anti-interference isolation unit, and an angle detection unit. The cutter contact signal detection unit is used to detect the tangent state of the fixed cutter and the moving cutter to obtain a level pulse signal. The signal noise anti-interference isolation unit is used to filter out the interference signals in the level pulse signal to obtain a standard level pulse signal that can be collected. The angle detection unit is used to detect the rotation position data information of the moving cutter shaft roller to obtain a position pulse signal;

[0011] The central processing module includes a central processing unit. The central processing unit is used to receive the signals collected by the signal acquisition module, judge the tangent state of the fixed cutter and the moving cutter according to the collected signals, and then output an alarm signal according to the tangent state.

[0012] Furthermore, the central processing module further includes a jitter-resistant pulse isolation module for filtering out the jitter interference signals in the level pulse signal. The jitter-resistant pulse isolation module includes a resistor-capacitor filter isolation shaping circuit module.

[0013] Furthermore, the central processing module further includes a pulse period recognition unit for recognizing periodic stable pulses, periodic abnormal pulses, and burst jitter pulses.

[0014] Furthermore, the signal noise anti-interference isolation unit includes a high-speed signal isolator.

[0015] Furthermore, the angle detection unit includes a position encoder.

[0016] Furthermore, it further includes an output display module and an alarm module. The output display module is used to display the data collected by the central processing module, and the alarm module is used to output an alarm signal.

[0017] A continuous extraction detection method for a soft tissue paper cutting machine includes the following steps:

[0018] Step (1): Insulate and connect both ends of the fixed cutter shaft roller to the frame, and apply low voltage power between the fixed cutter shaft roller and the moving cutter shaft roller;

[0019] Step (2): Collect the tangent state data of the fixed cutter and the moving cutter and the rotation position data of the moving cutter shaft roller through the information acquisition module, and filter out the interference signals in the collected data to obtain a standard signal that can be collected;

[0020] Step (3): The central processing module judges the tangent state and tangent position of the fixed cutter and the moving cutter according to the standard signal collected in step (2), and then outputs an alarm signal according to the tangent state and tangent position.

[0021] Further, in step (2), the tangency state between the fixed knife and the moving knife is detected by a cutter contact signal detection unit to obtain a level pulse signal, and the interference signal in the level pulse signal is filtered by a signal noise anti-interference isolation unit to obtain a collectable standard level pulse signal; the rotation position data information of the moving knife shaft roller is detected by an angle detection unit to obtain a position pulse signal.

[0022] Further, in step (2), the anti-shake pulse isolation module filters the jitter interference signal in the level pulse signal.

[0023] Further, the rotation of the moving knife shaft roller for one circle is divided into several intervals, and each interval corresponds to an interval pulse. The central processing module in step (3) obtains that the types of the interval pulses are periodic stable pulses, periodic abnormal pulses, and burst jitter pulses through a pulse period identification unit, and the types of the interval pulses obtained by the pulse period identification unit are the interval pulses detected for several consecutive circles.

[0024] Compared with the prior art, the present invention collects the tangency state data and position data of the cutter through a signal acquisition module, filters the interference signal to obtain a stable standard signal, the central processing module judges the tangency state between the fixed knife and the moving knife according to the collected signal, and then outputs an alarm signal according to the tangency state, with a high accuracy in judging cutter abnormality, effectively improving the work efficiency and reducing the labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings without creative efforts based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the soft tissue paper cutter of the present invention.

[0027] Figure 2 is Figure 1 the A-A sectional view.

[0028] Figure 3 It is a schematic diagram of the principle of the continuous extraction detection system of the soft tissue paper cutter of the present invention.

[0029] Figure 4 It is a logic diagram of the continuous extraction detection system of the soft tissue paper cutter of the present invention.

[0030] Figure 5 It is a flowchart of the continuous extraction detection system of the soft tissue paper cutter of the present invention.

[0031] Figure 6It is the level pulse signal of the continuous drawing detection system of the soft tissue paper cutting machine of the present invention.

[0032] Figure 7 It is the standard level pulse signal of the continuous drawing detection system of the soft tissue paper cutting machine of the present invention.

[0033] In the figure: 1-frame; 2-fixed knife shaft roller; 3-fixed knife; 4-moving knife shaft roller; 5-moving knife; 6-high-speed signal isolator; 7-position encoder; 8-proximity switch; 9-central processing unit. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] As Figures 1 to 7 shown, a continuous drawing detection system for a soft tissue paper cutting machine of the present invention includes

[0036] Frame 1; a moving knife shaft roller 4, provided with a plurality of moving knives 5, and both ends of the moving knife shaft roller 4 are rotatably installed on the frame 1; a fixed knife shaft roller 2, provided with at least one fixed knife 3, and both ends of the fixed knife shaft roller 2 are fixedly installed on the frame 1. Both ends of the fixed knife shaft roller 2 are insulated and connected to the bracket 1, and low-voltage power is applied between the fixed knife shaft roller 2 and the moving knife shaft roller. The specific operation is to first insulate the two support seats, swing arms and the connected mechanisms on both sides of the fixed knife shaft roller 2 to be in a non-conductive contact state with the entire frame 1, with an insulation resistance value > 0.5 MΩ, and connect the control positive electrode of the isolated 24v / 5v micro-current (7ma) to the fixed knife shaft roller 2, and install a negative electrode near the moving knife shaft roller 4. According to the cutting principle of the cutting knife, as long as it is detected whether the fixed knife 3 and the moving knife 5 are tangent and conductive in the working area, corresponding high and low levels will be generated, and after shaping and filtering, a signal that can be collected by the standard pulse plc will be formed. Both ends of the fixed knife shaft roller 2 and the frame can be insulated through insulating bearings, and the insulation structure is stable, avoiding affecting the detection effect when the fixed knife 3 is replaced.

[0037] The signal acquisition module includes a cutter contact signal detection unit, a signal noise anti-interference isolation unit, and an angle detection unit. The cutter contact signal detection unit is used to detect the tangent state of the fixed cutter and the moving cutter to obtain a level pulse signal. The signal noise anti-interference isolation unit is used to filter out the interference signals in the level pulse signal to obtain a standard level pulse signal that can be collected. The angle detection unit is used to detect the rotation position data information of the moving cutter shaft roller to obtain a position pulse signal. The signal noise anti-interference isolation unit includes a high-speed signal isolator 6. The signal noise anti-interference isolation unit is a special anti-electromagnetic interference measure for the operating environment of the folding machine, including the combined application of an isolation transformer, a power filter, an anti-interference magnetic ring, and shielded twisted pair. The angle detection unit includes a position encoder 7. The cutting machine can use the original position encoder 7 of the machine and add a proximity switch 8 to complete the position capture of the cutter, the grouping area, the number of sheets counted, and the pulse edge.

[0038] The central processing module includes a central processing unit 9. The central processing unit 9 is used to receive the signals collected by the signal acquisition module, judge the tangent state of the fixed cutter and the moving cutter according to the collected signals, and then output an alarm signal according to the tangent state. The central processing module also includes a jitter-resistant pulse isolation module, which is used to filter out the jitter interference signals in the level pulse signal. The jitter-resistant pulse isolation module includes a resistor-capacitor filter isolation shaping circuit module to prevent the interference signals generated by the cutter jitter from affecting the output result. The jitter-resistant pulse isolation module is a resistor-capacitor filter isolation shaping circuit module designed according to the jitter frequency and detection accuracy requirements of the fixed cutter and the moving cutter of the folding machine, and has the hardware processing functions of current limiting, anti-jitter, isolation, and shaping. The central processing unit 9 can be a single-chip microcomputer or a PLC system, detect the external encoder signal, the proximity switch 8 signal, and the cutter contact signal, and complete the system signal sampling input, state logic judgment, and continuous drawing alarm output.

[0039] The central processing module also includes a pulse period recognition unit, which is used to recognize periodic stable pulses, periodic abnormal pulses, and sudden jitter pulses. The rotation of the moving cutter shaft roller for one circle is divided into several intervals, and each interval corresponds to an interval pulse. By detecting the interval pulses of several consecutive circles, it is used to identify which type of pulse this interval pulse is. The present invention uses hardware interrupt to capture the pulse edge, dynamically detects the number of pulses and the pulse width, and through logical analysis and processing, multi-dimensionally determines whether there is a continuous drawing phenomenon, and outputs an alarm according to the judgment standard.

[0040] The output display module and the alarm module. The output display module is used to display the data collected by the central processing module, and the alarm module is used to output an alarm signal. The output display module can be a touch screen and an industrial control computer, or an intelligent human-machine interface product, with the digital performance of the equipment, and completes the functions of communication sampling, human-machine interaction, data storage, abnormal screening, status classification, historical review, and alarm display.

[0041] The continuous drawing detection system test method is used to detect the continuous drawing situation that occurs in the paper cutting process of the cutting machine, and prevent paper waste caused by incomplete cutting of the paper. The specific test method is to detect the number of pulses of the paper cutting knives on two main shafts. Each pulse can be regarded as each paper cutting knife on the shaft, and the operating state is displayed on the touch screen in the form of data and waveforms.

[0042] A continuous drawing detection method for a soft tissue paper cutting machine includes the following steps.

[0043] Step (1): Insulatively connect both ends of the fixed knife shaft roller to the machine frame, and apply low-voltage power between the fixed knife shaft roller and the moving knife shaft roller.

[0044] Step (2): The information acquisition module acquires the data of the tangent state between the fixed knife and the moving knife and the rotation position data of the moving knife shaft roller, and filters the interference signals in the acquired data to obtain the standard signals that can be acquired; filters the jitter interference signals in the level pulse signals through the anti-shake pulse isolation module. The tangent state between the fixed knife and the moving knife is detected by the cutter contact signal detection unit to obtain the level pulse signal, and the interference signals in the level pulse signal are filtered by the signal noise anti-interference isolation unit to obtain the standard level pulse signal that can be acquired; the rotation position data information of the moving knife shaft roller is detected by the angle detection unit to obtain the position pulse signal.

[0045] Step (3): The central processing module judges the tangent state and tangent position of the fixed knife and the moving knife according to the standard signals acquired in step (2), and then outputs an alarm signal according to the tangent state and tangent position.

[0046] The rotation of the moving knife shaft roller for one circle is divided into several intervals, and each interval corresponds to an interval pulse. The central processing module in step (3) obtains that the types of the interval pulses are periodic stable pulses, periodic abnormal pulses and burst jitter pulses through the pulse period recognition unit. The types of the interval pulses obtained by the pulse period recognition unit are the interval pulses detected for several consecutive circles.

[0047] As a specific implementation manner, one cutter is provided on the fixed knife shaft roller of the present invention, and six cutters are provided on the moving knife shaft roller. Setting the number of pulses per circle can simulate the length traveled in one circle. For example, if 12000 is set, the length traveled by each paper cutting knife on the moving knife shaft roller is 2000.

[0048] When continuous paper jams occur, the system will perform multi-loop sampling and judgment. If it appears at the same position multiple times, the data corresponding to the paper cutter will stabilize within a numerical range. At the same time, the waveform of the corresponding data position will change on the output display module. At this time, the system will determine it as a continuous paper jam state and give an alarm. This function can modify the judgment loop number and length deviation according to the actual situation, that is, change the discrimination conditions by changing the pulse coefficient and pulse width coefficient. The core point of this detection method is to use pulses to simulate the length traveled by the main shaft in one revolution and then subdivide it to each paper cutter. When paper cutter jitter interference occurs, such abnormal interference can be screened through position repeated detection to ensure the detection accuracy of continuous paper jams. This method can adjust the insulation treatment method according to different machine models and is suitable for the online continuous paper jam detection and judgment requirements of all paper cutters. Moreover, it can expand the entire online status of the acquisition machine, including but not limited to the vibration, temperature of the embossing shaft, the speed of the tension roller, and the action status of electric cylinders, air cylinders, and oil cylinders, etc., of various cutting and folding machines, realizing the digital transformation of the equipment.

[0049] The continuous paper jam detection system has the advantages of fast data processing, accurate abnormal discrimination, and intuitive status display. It helps enterprises reduce waste paper and waste materials, improve work efficiency, and reduce labor intensity.

[0050] Test and operation results:

[0051] 1. Adjust the settings of one of the fixed knives or moving knives to simulate separation bad points at 3 points: left, middle, and right, with a width ranging from about 1 mm to 5 mm. When the vehicle speed is 100 m / min, all continuous paper bad points can be correctly detected.

[0052] 2. Single-point test: Adjust the state of the fixed knife and the power half separation, that is, the distance between the two paper cutters is about 0.01 mm, with a width of about 1 mm. When the vehicle speed is 100 m / min, all continuous paper bad points can be correctly detected.

[0053] 3. When the machine running speed is 110 m / min, the detection equipment works normally all day long. It does not interfere with other equipment during the operation process. The above tests can detect both micro continuous paper and wide continuous paper, with high detection accuracy.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A continuous extraction detection system for a soft tissue paper cutting machine, characterized in that: including a frame; a moving knife shaft roller provided with a plurality of moving knives, and both ends of the moving knife shaft roller are rotatably mounted on the frame; a fixed knife shaft roller provided with at least one fixed knife, and both ends of the fixed knife shaft roller are fixedly mounted on the frame. Both ends of the fixed knife shaft roller are insulatedly connected to the bracket, and low-voltage power is applied between the fixed knife shaft roller and the moving knife shaft roller; a signal acquisition module, including a cutter contact signal detection unit, a signal noise anti-interference isolation unit and an angle detection unit. The cutter contact signal detection unit is used to detect the tangent state between the fixed knife and the moving knife to obtain a level pulse signal. The signal noise anti-interference isolation unit is used to filter out the interference signals in the level pulse signal to obtain a standard level pulse signal that can be collected. The angle detection unit is used to detect the rotational position data information of the moving knife shaft roller to obtain a position pulse signal; a central processing module, including a central processing unit. The central processing unit is used to receive the signals collected by the signal acquisition module, judge the tangent state between the fixed knife and the moving knife according to the collected signals, and then output an alarm signal according to the tangent state.

2. The continuous drawing detection system for a soft tissue paper cutting machine according to claim 1, wherein: The central processing module further includes a jitter-resistant pulse isolation module for filtering out the jitter interference signals in the level pulse signal. The jitter-resistant pulse isolation module includes a resistor-capacitor filter isolation shaping circuit module.

3. The continuous drawing detection system for a soft tissue paper cutting machine according to claim 1, wherein: The central processing module further includes a pulse period identification unit for identifying periodic stable pulses, periodic abnormal pulses and burst jitter pulses.

4. The continuous drawing detection system for the soft tissue paper cutting machine according to claim 1, wherein: The signal noise anti-interference isolation unit includes a high-speed signal isolator.

5. The continuous drawing detection system for a soft tissue paper cutting machine according to claim 1, characterized in that: The angle detection unit includes a position encoder.

6. The continuous drawing detection system for a soft tissue paper cutting machine according to claim 1, wherein: It further includes an output display module and an alarm module. The output display module is used to display the data collected by the central processing module, and the alarm module is used to output an alarm signal.

7. A continuous drawing detection method for a soft tissue paper cutting machine, characterized in that: including the following steps Step (1): Insulatedly connect both ends of the fixed knife shaft roller to the frame, and apply low-voltage power between the fixed knife shaft roller and the moving knife shaft roller; Step (2): Collect the tangent state data between the fixed knife and the moving knife and the rotational position data of the moving knife shaft roller through the information acquisition module, and filter out the interference signals in the collected data to obtain a standard signal that can be collected; Step (3): The central processing module judges the tangent state and tangent position between the fixed knife and the moving knife according to the standard signal collected in Step (2), and then outputs an alarm signal according to the tangent state and tangent position.

8. The continuous drawing detection method for the soft tissue paper cutting machine according to claim 7, characterized in that: In Step (2), the cutter contact signal detection unit is used to detect the tangent state between the fixed knife and the moving knife to obtain a level pulse signal, and the signal noise anti-interference isolation unit is used to filter out the interference signals in the level pulse signal to obtain a standard level pulse signal that can be collected; The angle detection unit is used to detect the rotational position data information of the moving knife shaft roller to obtain a position pulse signal.

9. The continuous drawing detection method for the soft tissue paper cutting machine according to claim 7, wherein: In Step (2), the jitter-resistant pulse isolation module is used to filter out the jitter interference signals in the level pulse signal.

10. The continuous drawing detection method for a soft tissue paper cutting machine according to claim 7, wherein: The rotation of the moving knife shaft roller for one circle is divided into several intervals, and each interval corresponds to an interval pulse. In Step (3), the central processing module obtains the types of the interval pulses through the pulse period identification unit as periodic stable pulses, periodic abnormal pulses and burst jitter pulses. The types of the interval pulses obtained by the pulse period identification unit are the interval pulses detected for several consecutive circles.

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