Cutting device and cutting method

Abstract

The application provides a cutting device and a cutting method. The cutting device comprises a cutter for cutting an outer layer of a packaging box, a driving module for driving the cutter to move in and out, a detection module comprising a thickness measuring sensor and a material quality sensor, the thickness measuring sensor being used for detecting the remaining thickness of the cut part of the outer layer, and the material quality sensor being used for detecting the material quality characteristic parameter of the cut part of the outer layer, a control module being used for calculating the cut thickness of the cut part of the outer layer according to the remaining thickness detected by the thickness measuring sensor, calculating the change rate of the material quality characteristic parameter of the cut part of the outer layer according to the material quality characteristic parameter detected by the material quality sensor, and controlling the operation of the driving module according to the cut thickness and the change rate of the material quality characteristic parameter. The cutting device can accurately control the depth of the cutter, avoid scratching the inner layer of the packaging box or the product inside the packaging box, and facilitate the unpacking operation.

Description

Technical Field

[0001] This invention relates to the field of cutting device technology, and in particular to a cutting device and a cutting method. Background Technology

[0002] Unpacking (i.e. opening packaging boxes) is a common operational step in logistics, warehousing, manufacturing, and daily life.

[0003] Currently, when opening a packaging box, tools such as box cutters (e.g., utility knives, dedicated box cutters) are generally used to cut the outer layer of the box. However, these tools rely on the user's feel to control the cutting depth, which can easily scratch the inner layer of the box or the product inside, making it inconvenient to open the box. Summary of the Invention

[0004] The purpose of this invention is to provide a cutting device that can precisely control the depth of the cutting tool, avoid scratching the inner layer of the packaging box or the products inside the packaging box, and facilitate the opening operation.

[0005] This invention provides a cutting device, comprising:

[0006] Cutting tools are used to cut the outer layer of packaging boxes;

[0007] A drive module, connected to the cutting tool, is used to drive the cutting tool to extend and retract.

[0008] The detection module includes a thickness sensor and a material sensor; the thickness sensor is used to detect the remaining thickness at the cut of the outer layer, and the material sensor is used to detect the material property parameters at the cut of the outer layer.

[0009] The control module is electrically connected to the drive module and the detection module respectively. The control module is used to calculate the cut thickness at the cut of the outer layer based on the remaining thickness detected by the thickness sensor, and to calculate the change rate of the material characteristic parameters at the cut of the outer layer based on the material characteristic parameters detected by the material sensor, and to control the operation of the drive module based on the cut thickness and the change rate of the material characteristic parameters.

[0010] Furthermore, the initial thickness of the outer layer before it is cut is H0, the remaining thickness is Hn, the cut thickness is H1, and H1 = |H0 - Hn|;

[0011] The initial material property parameter of the outer layer before it is cut is C0, the material property parameter is Cn, and the rate of change of the material property parameter is α, where α = |(C0-Cn) / C0|.

[0012] Furthermore, the thickness sensor is an ultrasonic thickness sensor, and the material sensor is a capacitive sensor.

[0013] Furthermore, the cutting device also includes a housing, the cutting tool is disposed inside the housing, and when the cutting tool moves telescopically, the cutting head of the cutting tool can extend outside the housing or retract into the housing; the detection module is disposed on the housing near one end of the cutting head.

[0014] Furthermore, the housing has a front end near the cutter head, and the detection module is disposed within the front end.

[0015] Furthermore, along the feed direction of the cutting tool, the outer dimension of the front end gradually decreases.

[0016] Furthermore, the drive module includes a rotary drive motor and a transmission assembly. The transmission assembly is connected to the rotary drive motor and the cutting tool respectively. The rotary drive motor drives the cutting tool to extend and retract through the transmission assembly. The control module is electrically connected to the rotary drive motor.

[0017] Furthermore, the cutting device also includes an alarm module, and the control module is electrically connected to the alarm module. When the control module detects an abnormal signal from the thickness sensor and / or the material sensor, the control module controls the tool to stop feeding and retract through the drive module, and simultaneously controls the alarm module to perform an alarm action.

[0018] The present invention also provides a cutting method based on the cutting device described above, the cutting method comprising:

[0019] The detection module is placed close to the outer layer of the packaging box, and the initial thickness H0 and initial material characteristic parameter C0 of the outer layer when it is not cut are detected by the thickness sensor and the material sensor, respectively.

[0020] The control module drives the tool to perform a cutting action through the drive module to cut the outer layer. During the cutting process, the remaining thickness Hn and material property parameter Cn at the cut of the outer layer are detected in real time by the thickness sensor and the material sensor, respectively. The control module calculates the cut thickness H1 at the cut of the outer layer based on the initial thickness H0 and the remaining thickness Hn, and calculates the change rate α of the material property parameter at the cut of the outer layer based on the initial material property parameter C0 and the material property parameter Cn.

[0021] When the cut thickness H1 is greater than or equal to the first preset thickness, and the change rate of the material property parameter α is greater than or equal to the first preset change rate, the control module controls the tool to stop feeding or stop feeding and retract through the drive module.

[0022] Furthermore, the cutting method also includes:

[0023] During the cutting process, when the cut thickness H1 is less than the first preset thickness and the change rate of the material property parameter α is less than the first preset change rate, the control module controls the tool to feed at a constant speed through the drive module.

[0024] When the second preset thickness ≤ the cut thickness H1 < the first preset thickness, or the second preset change rate ≤ the change rate of material property parameters α < the first preset change rate, the control module controls the tool to decelerate and feed through the drive module.

[0025] The cutting device provided by this invention detects the remaining thickness and material characteristics at the outer layer cut of the packaging box using thickness and material sensors. The control module calculates the rate of change of the cut thickness and material characteristics at the outer layer cut and controls the operation of the drive module based on this rate of change. When the rate of change of the cut thickness and material characteristics reaches a set threshold, it indicates a sudden change in the cut thickness and material. Based on this, it is determined that the cutter has reached the critical position between the outer and inner layers (or between the outer layer and the product). At this point, the control module controls the cutter to stop advancing or retract, thereby precisely controlling the cutting depth. This cutting device controls the cutting depth through simultaneous detection of thickness and material dimensions, resulting in high accuracy. It effectively prevents scratches on the inner layer of the packaging box or the product inside, facilitates opening operations, and is applicable to opening packaging boxes of different materials and thicknesses, making it widely applicable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the cutting device in an embodiment of the present invention before the housing is attached to the outer layer of the packaging box.

[0027] Figure 2 This is a schematic diagram of the structure of the cutting device after its housing is attached to the outer layer of the packaging box in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the cutting device in an embodiment of the present invention cutting the outer layer of a packaging box.

[0029] Figure 4 This is a schematic diagram showing the electrical signal connection relationship between the control module and other components in an embodiment of the present invention. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0032] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this invention are defined by the position of the structures in the drawings and the relative positions of the structures, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.

[0033] Figures 1 to 3 This is a schematic diagram illustrating the working process of the cutting device in an embodiment of the present invention, wherein... Figure 1 This is a schematic diagram of the structure of the cutting device in an embodiment of the present invention before the housing is attached to the outer layer of the packaging box. Figure 2 This is a schematic diagram of the structure of the cutting device housing after it is attached to the outer layer of the packaging box in an embodiment of the present invention. Figure 3 This is a schematic diagram of the cutting device cutting the outer layer of the packaging box in an embodiment of the present invention. Figure 4 This is a schematic diagram showing the electrical signal connection relationship between the control module and other components in an embodiment of the present invention.

[0034] like Figures 1 to 4 As shown, an embodiment of the present invention provides a cutting device, comprising:

[0035] Cutting tool 1 is used to cut the outer layer 91 of the packaging box 9; when cutting tool 1 cuts the outer layer 91, a cut 910 will be formed on the outer layer 91.

[0036] Drive module 2, connected to cutter 1, is used to drive cutter 1 to extend and retract, so that cutter 1 moves toward or away from packaging box 9;

[0037] The detection module 3 includes a thickness sensor 31 and a material sensor 32. The thickness sensor 31 is used to detect the remaining thickness at the cut 910 of the outer layer 91 (i.e., the thickness of the outer layer 91 that has not been cut), and the material sensor 32 is used to detect the material characteristic parameters at the cut 910 of the outer layer 91.

[0038] The control module 4 is electrically connected to the drive module 2 and the detection module 3 (including the thickness sensor 31 and the material sensor 32) respectively. The control module 4 is used to calculate the cut thickness at the cut 910 of the outer layer 91 (i.e., the thickness of the outer layer 91 that has been cut) based on the remaining thickness detected by the thickness sensor 31, and to calculate the change rate of the material characteristic parameters at the cut 910 of the outer layer 91 based on the material characteristic parameters detected by the material sensor 32. The control module 4 controls the operation of the drive module 2 based on the cut thickness and the change rate of the material characteristic parameters to control the depth of cut of the tool 1.

[0039] Specifically, the packaging box 9 generally includes an outer layer 91 and an inner layer 92. The inner layer 92 is located inside the outer layer 91, and the product is packaged inside the inner layer 92 (of course, in some embodiments, the packaging box 9 may not have an inner layer 92, and the product is directly packaged inside the outer layer 91). In this embodiment, a thickness sensor 31 and a material sensor 32 are used to detect the remaining thickness and material characteristic parameters at the cut 910 of the outer layer 91 of the packaging box 9. The control module 4 calculates the rate of change of the cut thickness and material characteristic parameters at the cut 910 of the outer layer 91 based on this, and controls the operation of the drive module 2 according to the rate of change of the cut thickness and the material characteristic parameters. When the rate of change of the cut thickness and the material characteristic parameters reaches a set threshold, it indicates that a sudden change in the cutting thickness and material has occurred at the cut 910. Based on this, it is determined that the cutter 1 has reached the critical position between the outer layer 91 and the inner layer 92 (or between the outer layer 91 and the product). At this time, the control module 4 controls the cutter 1 to stop cutting or retract, thereby accurately controlling the cutting depth of the cutter 1. (If a single-dimensional method is used for detection and judgment, such as only detecting thickness or material, the device cannot adapt to changes in different material-thickness combinations, which can easily lead to overcutting, undercutting, or product damage.) This cutting device controls the cutting depth of the blade 1 by simultaneously detecting thickness and material dimensions. It has high accuracy and can effectively prevent the inner layer 92 of the packaging box 9 or the product inside the packaging box 9 from being scratched. It facilitates the opening operation and can be used for opening the packaging box 9 with different materials and thicknesses, making it widely applicable.

[0040] Furthermore, in this embodiment, the initial thickness of the outer layer 91 before it is cut is H0, the remaining thickness is Hn, and the cut thickness is H1, where H1 = |H0 - Hn|. The initial thickness H0 is measured by the thickness sensor 31.

[0041] The initial material property parameters of the outer layer 91 before it is cut are C0 and Cn, and the rate of change of the material property parameters is α, where α = |(C0-Cn) / C0|. The initial material property parameter C0 is measured by the material sensor 32.

[0042] Furthermore, in this embodiment, the thickness sensor 31 is an ultrasonic thickness sensor. The thickness detection range of the ultrasonic thickness sensor can be 0.1mm-10mm, and the detection error is ≤±0.05mm. Specifically, the ultrasonic thickness sensor is a non-contact thickness sensor. The ultrasonic thickness sensor may include an ultrasonic probe. When the ultrasonic pulse emitted by the ultrasonic thickness sensor passes through the outer layer 91 and reaches the interface between the outer layer 91 and the inner layer 92, the ultrasonic pulse is reflected back to the ultrasonic thickness sensor. The ultrasonic thickness sensor determines the remaining thickness at the cut 910 by measuring the propagation time of the ultrasonic pulse in the outer layer 91. The specific working principle of the ultrasonic thickness sensor can be found in the prior art and will not be elaborated here. Of course, in other embodiments, the thickness sensor 31 can also be other types of sensors.

[0043] In this embodiment, the material sensor 32 is a capacitance sensor, specifically a non-contact capacitance sensor (which may include a capacitor chip). The capacitance sensor detects the capacitance value at the cut 910 of the outer layer 91, meaning that both the aforementioned material characteristic parameter Cn and the initial material characteristic parameter C0 are capacitance values. Since the materials of the outer layer 91 and the inner layer 92 are generally different, their dielectric constants differ significantly. When the tool 1 cuts to the critical position between the outer layer 91 and the inner layer 92, the capacitance value detected by the capacitance sensor will change abruptly. The specific working principle of the capacitance sensor can be found in existing technology and will not be elaborated here. The capacitance detection range of the capacitance sensor can be 0.1pF-10pF. Of course, in other embodiments, the material sensor 32 can also be other types of sensors (e.g., photoelectric sensors for detecting optical color / reflectivity, which are suitable for situations where the colors of the inner and outer layers differ significantly).

[0044] It should be noted that the ultrasonic thickness sensor and the capacitive sensor do not need to be in direct contact with the outer layer 91 (the current from the capacitive sensor will penetrate the air to reach the outer layer 91). It is sufficient to ensure that the ultrasonic thickness sensor and the capacitive sensor are close to the outer layer 91. For example, during the cutting process, the distance between the detection surfaces of the ultrasonic thickness sensor and the capacitive sensor and the outer layer 91 should be ≤0.5mm. During the cutting process, the ultrasonic thickness sensor and the capacitive sensor are aligned with the cut 910 on the outer layer 91, and the detection areas of the ultrasonic thickness sensor and the capacitive sensor are parallel to the cutting path of the tool 1.

[0045] Furthermore, in this embodiment, the packaging box opening device also includes a housing 5, with a cutter 1 disposed inside the housing 5, and the cutter 1 is capable of telescopic movement relative to the housing 5. One end of the cutter 1 is provided with a cutting head 11, which is used to cut the outer layer 91 of the packaging box 9 (the cutter 1 is schematically shown in the figure, but the specific structure of the cutter 1 can be varied); when the cutter 1 telescopically moves, the cutting head 11 of the cutter 1 can extend outside the housing 5 or retract inside the housing 5. The detection module 3 (including a thickness sensor 31 and a material sensor 32) is disposed on the housing 5 near the end of the cutting head 11.

[0046] Specifically, in this embodiment, a front end portion 51 is provided on the housing 5 near the cutter head 11, and the detection module 3 is disposed within the front end portion 51. Specifically, a mounting groove (not labeled in the figure) can be provided on the front end portion 51, the mounting groove penetrating the end face of the front end portion 51, and the thickness sensor 31 and the material sensor 32 are embedded and installed within the mounting groove. Figure 1 As shown, before the cutting device is started, the blade head 11 of the cutter 1 is located inside the housing 5, and the front end 51 of the housing 5 is not yet close to the outer layer 91 of the packaging box 9; as Figure 2 As shown, before cutting, the cutting device is started, and the front end 51 of the shell 5 is placed close to the outer layer 91 of the packaging box 9 (the front end 51 may or may not contact the outer layer 91). Then, the initial thickness H0 and the initial material characteristic parameter C0 are detected by the thickness sensor 31 and the material sensor 32, respectively. Figure 3 As shown, the drive module 2 then drives the cutting head 11 of the tool 1 to extend outside the housing 5 to cut the outer layer 91, and the thickness sensor 31 and material sensor 32 detect the Hn and Cn respectively. When the front end 51 is close to the outer layer 91 of the packaging box 9, if the thickness sensor 31 and / or material sensor 32 do not detect valid data, it is determined that the thickness / material of the outer layer 91 is abnormal. The control module 4 then prohibits the drive module 2 from operating (i.e., prohibits the cutting action) and controls the alarm module 6 to perform an alarm action to prompt manual inspection.

[0047] In this embodiment, along the cutting direction S of the cutter 1 (i.e., the direction in which the cutter 1 extends out of the housing 5), the outer dimension of the front end portion 51 gradually decreases, so as to facilitate the insertion of the front end portion 51 into the cut 910 of the outer layer 91 and to facilitate the front end portion 51 cutting open the outer layer 91. The purpose of this arrangement is that when the cutter 1 stops cutting, the cutting head 11 of the cutter 1 may not completely cut off the outer layer 91 (for example, the outer layer 91 may still have 1mm of thickness remaining). When cutting open the outer layer 91 later (when cutting the outer layer 91, a cut 910 needs to be formed on the outer layer 91 first, and then the outer layer 91 can be cut open), the user can use the front end portion 51 of the housing 5 as a wedge to crack / tear open the uncut part of the outer layer 91, that is, the cutting action can be completed without the participation of the cutting head 11, which ensures the absolute safety of the inner layer 92 (the cutting head 11 does not touch the inner layer 92) and does not affect the opening effect. The specific shape of the front end portion 51 can be a wedge-shaped structure, a frustum-shaped structure, a pyramid-shaped structure, etc.

[0048] Furthermore, in this embodiment, the drive module 2 includes a rotary drive motor and a transmission assembly. The transmission assembly is connected to both the rotary drive motor and the cutter 1. The rotary drive motor drives the cutter 1 to extend and retract via the transmission assembly; that is, the transmission assembly converts the rotational motion of the rotary drive motor into the extension and retraction motion of the cutter 1. The control module 4 is electrically connected to the rotary drive motor and is used to control the operation of the rotary drive motor (e.g., forward, reverse, and rotational speed). The rotary drive motor can be a coreless motor, and the transmission assembly can be a gear assembly, etc. Of course, in other embodiments, the drive module 2 may also include a telescopic drive motor, etc.

[0049] Furthermore, in this embodiment, the cutting device also includes an alarm module 6, and the control module 4 is electrically connected to the alarm module 6. When the control module 4 detects an abnormal signal from the thickness sensor 31 and / or the material sensor 32, the control module 4 controls the cutter 1 to stop advancing and retract via the drive module 2 (i.e., the cutter 1 moves away from the packaging box 9, that is, moves in the opposite direction to the aforementioned advance direction S), and simultaneously controls the alarm module 6 to perform an alarm action. The alarm module 6 may include a light alarm element (e.g., a warning light) and / or a sound alarm element (e.g., a buzzer). When the control module 4 cannot receive signals from the thickness sensor 31 and / or the material sensor 32, or when the output value of the thickness sensor 31 and / or the material sensor 32 exceeds its range, the control module 4 controls the cutter 1 to stop advancing and retract via the drive module 2, and simultaneously locks the drive module 2. The system needs to press a reset button and complete a self-check before it can resume advancing (i.e., the cutting device also includes a reset button, which is electrically connected to the control module 4). This ensures operational safety in abnormal situations.

[0050] Furthermore, in this embodiment, the cutting device also includes a power module (not shown). The power module is electrically connected to the drive module 2, detection module 3, control module 4, and alarm module 6, respectively, and is used to supply power to each component. Specifically, the power module may include a battery, and its output voltage can be 3.3V-5V, supporting continuous operation. Simultaneously, the power module has a real-time voltage monitoring function. When the voltage of the power module is lower than a preset value, such as below 3.3V, the control module 4 prohibits the drive module 2 from operating (i.e., prohibits the feed action) and controls the alarm module 6 to perform an alarm action.

[0051] Furthermore, in this embodiment, the drive module 2, control module 4, and power module can be housed inside the housing 5, while the alarm module 6 can be mounted on the housing 5. The wires connecting the various components can be routed within the housing 5.

[0052] Furthermore, in this embodiment, the control module 4 can specifically be a microcontroller unit (MCU), etc.

[0053] Furthermore, in this embodiment, the cutting device can specifically be a handheld box opener, a small cutting machine, a warehouse box opener, etc. When the cutting device is a handheld box opener, the aforementioned housing 5 serves as a handle. When the cutting device is a small cutting machine or a warehouse box opener, the cutting device may also include a drive assembly connected to the housing 5. The drive assembly is used to drive the housing 5 to move in a direction parallel to the surface of the outer layer 91, thereby driving the blade 1 to move in a direction parallel to the surface of the outer layer 91, and thus performing the action of "cutting open" the outer layer 91.

[0054] This invention also provides a cutting method based on the cutting device described above, the cutting method comprising:

[0055] The detection module 3 is placed close to the outer layer 91 of the packaging box 9, and the initial thickness H0 and initial material characteristic parameter C0 of the outer layer 91 when it is not cut are detected by the thickness sensor 31 and the material sensor 32, respectively.

[0056] The control module 4 drives the tool 1 to perform a cutting action through the drive module 2 to cut the outer layer 91. During the cutting process, the remaining thickness Hn and material characteristic parameter Cn at the cut 910 of the outer layer 91 are detected in real time by the thickness sensor 31 and the material sensor 32 respectively. The control module 4 calculates the cut thickness H1 at the cut 910 of the outer layer 91 based on the initial thickness H0 and the remaining thickness Hn, and calculates the change rate α of the material characteristic parameter at the cut 910 of the outer layer 91 based on the initial material characteristic parameter C0 and the material characteristic parameter Cn.

[0057] When the cut thickness H1 is greater than or equal to the first preset thickness, and the change rate of the material property parameter α is greater than or equal to the first preset change rate, the control module 4 controls the tool 1 to stop feeding and retract (or only stop feeding) through the drive module 2.

[0058] Furthermore, in this embodiment, the cutting method further includes:

[0059] During the cutting process, when the cut thickness H1 is less than the first preset thickness and the change rate of material property parameters α is less than the first preset change rate, the control module 4 controls the tool 1 to feed at a constant speed through the drive module 2.

[0060] When the second preset thickness ≤ the cut thickness H1 < the first preset thickness, or the second preset rate of change ≤ the rate of change of material property parameters α < the first preset rate of change, the control module 4 controls the tool 1 to decelerate and feed forward through the drive module 2; wherein the second preset thickness < the first preset thickness, and the second preset rate of change < the first preset rate of change. This effectively avoids overfeeding of the tool 1 while ensuring cutting efficiency.

[0061] The following example illustrates the steps of this cutting method, using a first preset thickness of 0.5mm, a second preset thickness of 0.3mm, a first preset change rate of 15%, and a second preset change rate of 10%.

[0062] 1. Pre-detection stage: such as Figure 2 As shown, after the cutting device is started, the detection module 3 (front end 51 of the housing 5) is placed close to the outer layer 91 of the packaging box 9. The control module 4 controls the thickness sensor 31 and the material sensor 32 to sample synchronously for 10ms at a frequency of 1kHz, and automatically detects the initial thickness H0 and the initial material characteristic parameter C0 (capacitance value) of the outer layer 91 when it is not cut.

[0063] 2. Tool entry detection stage: such as Figure 3 As shown, when the user or device initiates the cutting action, the control module 4 drives the tool 1 to move towards the outer layer 91 via the drive module 2, i.e., the tool 1 performs the cutting action to cut the outer layer 91. During the cutting process, the remaining thickness Hn and the material characteristic parameter Cn (capacitance value) at the cut 910 of the outer layer 91 are detected in real time by the thickness sensor 31 and the material sensor 32, respectively. The control module 4 calculates the cut thickness H1 at the cut 910 of the outer layer 91 based on the initial thickness H0 and the remaining thickness Hn, and calculates the rate of change α of the material characteristic parameter at the cut 910 of the outer layer 91 based on the initial material characteristic parameter C0 and the material characteristic parameter Cn. Wherein, H1=|H0-Hn|, α=|(C0-Cn) / C0|.

[0064] 3. Cutting control stage: The control module 4 performs real-time analysis on the calculated cut thickness H1 and the change rate α of material property parameters.

[0065] When the cut thickness H1 < 0.5 mm and the material property parameter change rate α < 15%, it is determined that the outer layer 91 material and thickness are uniform at this time, and the control module 4 controls the tool 1 to feed at a uniform speed through the drive module 2.

[0066] When 0.3mm≤cut thickness H1<0.5mm, or 10%≤material property parameter change rate α<15%, that is, the material / thickness single dimension is close to the threshold, it is judged that the material / thickness is gradually changing. The control module 4 controls the tool 1 to decelerate the feed speed through the drive module 2 (for example, the feed speed is reduced by 30%).

[0067] When the cut thickness H1 ≥ 0.5 mm and the material property parameter change rate α ≥ 15%, it is determined that this is the critical point of material / thickness abrupt change. The control module 4 controls the tool 1 to immediately stop feeding and retract (or only stop feeding) through the drive module 2, for example, retracting 2 mm ± 0.05 mm, in order to avoid damaging the inner layer 92.

[0068] The advantages of this cutting device include:

[0069] 1. Wide range of applications: It can accurately identify common packaging material combinations in daily life and production (three-layer corrugated paper → five-layer corrugated paper, corrugated paper → plastic bags, kraft paper → white cardboard, cardboard → composite film, film → foam, corrugated paper → pearl cotton, etc.), taking into account both daily non-professional operations and continuous production operations.

[0070] 2. Excellent detection accuracy and response speed: thickness detection error ≤0.05mm, material identification accuracy ≥98%, sudden change critical point judgment delay ≤3ms, emergency control response ≤50ms, probability of accidental puncture of inner layer in daily use <0.3%, and overcut rate in production <0.5%;

[0071] 3. Low cost and high versatility: The core components are mass-produced ultrasonic probes, capacitor chips, motors, etc., resulting in low material costs for the whole machine. It can be directly mounted on handheld cutting tools, small production equipment, etc., without the need to modify the original operation process.

[0072] 4. High safety: When a single point of failure occurs in the system (power supply undervoltage, sensor malfunction, thickness / material recognition malfunction, etc.), the system immediately executes the action of "prohibiting tool advance" or "locking tool retraction" to avoid accidental damage or waste of production materials during daily operation;

[0073] 5. Easy to operate and requires no professional training: The system automatically completes pre-testing and calibration, eliminating the need for manual threshold setting. Users can get started immediately in daily use, and the system can be seamlessly integrated into existing production lines to improve operational efficiency.

[0074] Example 1 (Everyday life scenario: Unpacking a package)

[0075] The cutting device is a handheld box opener. The outer layer of the packaging box is three layers of corrugated cardboard, and the inner layer is plastic film. The user uses the handheld box opener to open the packaging box. The opening process is divided into the following stages:

[0076] 1. Pre-detection stage: The detection module is placed close to the outer layer of the packaging box. Within 10ms, the system collects the initial thickness H0=3.1mm and the initial capacitance C0=2.3pF of the outer layer.

[0077] 2. Cutting Detection Stage: The control module drives the cutter towards the outer layer of the packaging box via the drive module to cut the outer layer. During the cutting process, the remaining thickness Hn and real-time capacitance Cn at the cut of the outer layer are detected by thickness and material sensors, respectively. The control module calculates the cut thickness H1 at the cut of the outer layer based on the initial thickness H0 and the remaining thickness Hn, and calculates the rate of change α of the material property parameters at the cut of the outer layer based on the initial capacitance C0 and the real-time capacitance Cn. H1=|H0-Hn|, α=|(C0-Cn) / C0|.

[0078] 3. Cutting Control Stage: The control module performs real-time analysis on the calculated cut thickness H1 and the rate of change of material property parameters α. When Hn=2.4mm, Cn=2.7 pF, H1=0.7mm, and α=17.4%, exceeding the set thresholds (0.5mm, 15%), it is determined to be a sudden change from corrugated paper to plastic film. At this time, the control module controls the cutter to immediately stop cutting and retract a certain distance through the drive module to avoid tearing the inner plastic film.

[0079] After cutting open the outer layer of the packaging box, the cosmetic packaging boxes inside were intact and without any scratches.

[0080] Example 2 (Production Scenario: Cutting Small Printed Packaging Boxes)

[0081] The cutting device is a small cutting machine. The outer layer of the packaging box is white cardboard, and the inner layer is PE film. The small cutting machine is used to cut the packaging box. The cutting process is divided into the following stages:

[0082] 1. Pre-detection stage: The detection module is placed close to the outer layer of the packaging box. The system collects the initial thickness of the outer layer H0=0.9mm and the initial capacitance C0=1.8pF.

[0083] 2. Cutting Detection Stage: The control module drives the cutter towards the outer layer of the packaging box via the drive module to cut the outer layer. During the cutting process, the remaining thickness Hn and real-time capacitance Cn at the cut of the outer layer are detected by thickness and material sensors, respectively. The control module calculates the cut thickness H1 at the cut of the outer layer based on the initial thickness H0 and the remaining thickness Hn, and calculates the rate of change α of the material property parameters at the cut of the outer layer based on the initial capacitance C0 and the real-time capacitance Cn. H1=|H0-Hn|, α=|(C0-Cn) / C0|.

[0084] 3. Cutting Control Stage: The control module performs real-time analysis on the calculated cut thickness H1 and the rate of change of material property parameters α. When Hn=0.3mm, Cn=3.2pF, H1=0.6mm, and α=77.8%, exceeding the set thresholds (0.5mm, 15%), it is determined to be a sudden change from white cardboard to PE film. At this time, the control module controls the cutter to immediately stop cutting through the drive module, maintaining a cutting depth of 0.6mm to avoid tearing the inner PE film.

[0085] The pass rate for this cutting operation reached 99.8%, which is 12% higher than that of traditional small cutting machines without cutting detection function.

[0086] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A cutting method based on a cutting device, characterized in that, The cutting device includes: Cutting tools are used to cut the outer layer of packaging boxes; A drive module, connected to the cutting tool, is used to drive the cutting tool to extend and retract. The detection module includes a thickness sensor and a material sensor; the thickness sensor is used to detect the remaining thickness at the cut of the outer layer, and the material sensor is used to detect the material property parameters at the cut of the outer layer. The housing contains the cutting tool, which is disposed within the housing. When the cutting tool moves telescopically, the cutting tip can extend outside the housing or retract into the housing. A front end portion is provided on the housing near the cutting tip, and the detection module is disposed within the front end portion. The outer dimensions of the front end portion gradually decrease along the cutting direction of the cutting tool. The control module is electrically connected to the drive module and the detection module respectively; the control module is used to calculate the cut thickness at the cut of the outer layer based on the remaining thickness detected by the thickness sensor, and to calculate the change rate of the material characteristic parameters at the cut of the outer layer based on the material characteristic parameters detected by the material sensor, and to control the operation of the drive module based on the cut thickness and the change rate of the material characteristic parameters. The cutting method includes: The detection module is placed close to the outer layer of the packaging box, and the initial thickness H0 and initial material characteristic parameter C0 of the outer layer when it is not cut are detected by the thickness sensor and the material sensor, respectively. The control module drives the tool to perform a feed action through the drive module to cut the outer layer. During the cutting process, the remaining thickness Hn and material property parameter Cn at the cut of the outer layer are detected in real time by the thickness sensor and the material sensor, respectively. The control module calculates the cut thickness H1 at the cut of the outer layer based on the initial thickness H0 and the remaining thickness Hn, and calculates the rate of change α of the material property parameter at the cut of the outer layer based on the initial material property parameter C0 and the material property parameter Cn; where H1=|H0-Hn|, α=|(C0-Cn) / C0|. When the cut thickness H1 is greater than or equal to the first preset thickness, and the change rate of the material property parameter α is greater than or equal to the first preset change rate, the control module controls the tool to stop feeding or stop feeding and retract through the drive module.

2. The cutting method as described in claim 1, characterized in that, The cutting method further includes: During the cutting process, when the cut thickness H1 is less than the first preset thickness and the change rate of the material property parameter α is less than the first preset change rate, the control module controls the tool to feed at a constant speed through the drive module. When the second preset thickness ≤ the cut thickness H1 < the first preset thickness, or the second preset change rate ≤ the change rate of material property parameters α < the first preset change rate, the control module controls the tool to decelerate and feed through the drive module.

3. The cutting method as described in claim 1, characterized in that, The thickness sensor is an ultrasonic thickness sensor, and the material sensor is a capacitive sensor.

4. The cutting method as described in claim 1, characterized in that, The drive module includes a rotary drive motor and a transmission assembly. The transmission assembly is connected to the rotary drive motor and the cutting tool respectively. The rotary drive motor drives the cutting tool to extend and retract through the transmission assembly. The control module is electrically connected to the rotary drive motor.

5. The cutting method according to any one of claims 1-4, characterized in that, The cutting device also includes an alarm module, and the control module is electrically connected to the alarm module. When the control module detects an abnormal signal from the thickness sensor and / or the material sensor, the control module controls the tool to stop feeding and retract through the drive module, and simultaneously controls the alarm module to perform an alarm action.

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