Paper tube cutting and section appearance automatic detection device

Abstract

The invention discloses a paper tube cutting-off and section appearance automatic detection device, which can respectively drive an electric heating wire cutter to perform circular motion and linear motion through parts such as a cutting-off ring frame, an air cylinder and the electric heating wire cutter, so that the electric heating wire cutter can control a cutting-off point position and a cutting-off depth; the cutting-off process can be adjusted according to the specification of the flat and oval paper tube, and the accuracy of the cut-off face of the flat and oval paper tube is guaranteed; a processing unit, an evaluation unit and a section appearance automatic detection device are arranged on the machine frame, a virtual contour can be generated to cut off a flat oval paper tube, the virtual contour can be adjusted and corrected according to the evaluation unit, a follow-up cut-off process can be modified according to the current cut-off effect, and the cut-off efficiency is improved. And the whole cutting process can be adjustable, so that the whole cutting is more stable, and the cutting plane is smoother.

Description

Technical Field

[0001] The present invention relates to the technical field of electric heat cutting, in particular to a cutting device using a heated metal wire, and in particular to a paper tube cutting and cross-section appearance automatic detection device. Background Art

[0002] Paper tubes are hollow cylindrical structures, usually made of paper or cardboard. They are widely used to package, transport, store and protect various products, such as paper, cloth, plastic film, etc. Flat oval paper tubes are relatively flat paper tubes, usually used to package wider products or products that require a larger surface area for support. Flat oval paper tubes are usually rolled up from multiple layers of paper or cardboard, and have strong support and protection.

[0003] Flat oval paper tubes are usually used to package and transport some wider products, such as carpets, cloth, rolls of paper, etc. Since flat oval paper tubes have a large surface area support capacity and can effectively protect products from being squeezed or deformed, they are widely used in these fields.

[0004] Prior art CN212888036U discloses a new type of paper cutter for printing plants, including a hot cutting knife assembly, a positioning assembly, a pin shaft, a support column, a synchronous belt, a servo motor, a motor shaft, a transmission shaft, a dust suction duct, and a sealing gasket. The hot cutting knife assembly is provided with a heating wire, a connecting fixture, an electric heating slot, and a base. The positioning assembly is provided with a positioning plate, a fixing plate, and a slide plate. The synchronous belt drives the hot cutting knife assembly to move up and down in a straight line through the pin shaft. The setting of the heating wire can enhance the cutting efficiency, and does not need to be frequently replaced during use. In addition, since the heating wire and the positioning assembly are used in conjunction for cutting, fast and accurate cutting can be achieved, thereby improving the working efficiency of the paper cutter. However, in the process of cutting the flat oval paper tube, since the cutting direction of the heating wire on the hot knife assembly is single, the high support of the flat oval paper tube will affect the tension of the heating wire, and in the oval cross section of the flat oval paper tube, the cutting contact point will change dramatically, making the cutting of the flat oval paper tube inaccurate.

[0005] Therefore, it is necessary to improve the paper tube cutting device in the prior art to solve the above problems. Summary of the invention

[0006] The present invention overcomes the shortcomings of the prior art and provides a paper tube cutting and cross-section appearance automatic detection device, aiming to solve the defect of inaccurate cutting of flat elliptical paper tubes in the prior art.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a paper tube cutting device, comprising: a frame, a cutting unit arranged on the frame, and clamping units arranged on both sides of the cutting unit;

[0008] The clamping unit is used to clamp the two ends of the flat oval paper tube;

[0009] The cutting unit comprises: a cutting base, a cutting ring frame fixedly arranged on the cutting base, and an electric heating cutting unit arranged on the cutting ring frame; the cutting ring frame moves along the length direction of the flat elliptical paper tube; the electric heating cutting unit comprises: a support member, and an electric heating wire cutter connected to the support member; the support member drives the electric heating wire cutter to move along the circumference of the cutting ring frame, a cylinder is arranged on the support member, and the cylinder drives the electric heating wire cutter to move linearly, and the linear movement direction of the electric heating wire cutter points to the center of the cutting ring frame;

[0010] The frame is provided with an automatic cross-section appearance detection device, a processing unit, a contour virtual unit, an evaluation unit and a control unit;

[0011] The cross-sectional appearance automatic detection device is used to detect the cross-sectional information of the initial flat elliptical paper tube and the cross-sectional information of each circle cut;

[0012] The processing unit is connected to the cross-sectional appearance automatic detection device to generate a cross-sectional model, and updates the cross-sectional model according to the cross-sectional information of each cutting cycle;

[0013] The contour virtual unit receives the cross-sectional model output by the processing unit, generates a preset virtual contour for each circle, generates a number of cutting points and cutting depths corresponding to the preset virtual contour, and outputs a preset cutting flatness index for the preset virtual contour for each circle; wherein the cutting depth is the amount of linear motion of the electric heating wire cutter;

[0014] The evaluation unit outputs an actual cut-off smoothness index of each circle according to the cross-sectional model updated by the processing unit, corrects a preset cut-off smoothness index of the preset virtual profile of each circle, and outputs a correction amount;

[0015] The contour virtual unit adjusts the preset virtual contour, and a number of cutting points and cutting depths corresponding to the preset virtual contour according to the correction amount;

[0016] The control unit is connected to the contour virtual unit and is used to control the linear motion and circular motion of the heating wire cutter according to the cutting point and the cutting depth.

[0017] In a preferred embodiment of the present invention, the heating wire cutter includes: a heating wire, a tension adjustment unit and a tension detection unit. The linear movement direction of the heating wire is perpendicular to the tangential direction of the cutting point. The tension adjustment unit is used to adjust the tension of the heating wire. The tension detection unit is used to monitor the tension of the heating wire in real time.

[0018] In a preferred embodiment of the present invention, the preset virtual contour of each circle refers to the preset contour line of the circle cutting on the flat elliptical paper tube, and the contour line of the virtual contour is the preset cutting depth boundary line of each circle cutting operation, and the contour virtual unit generates the number of cutting circles and the preset virtual contour of each circle according to the cross-sectional model generated by the processing unit.

[0019] In a preferred embodiment of the present invention, a plurality of cutting points and cutting depths are determined according to a preset virtual contour, the cutting points of the i+1th circle are respectively arranged between adjacent cutting points of the i-th circle, and the average cutting depth of the i+1th circle is greater than the average cutting depth of the i-th circle.

[0020] In a preferred embodiment of the present invention, the cutting flatness index is: the flatness index of the cut section in the flat elliptical paper tube, the cut section is the section of each circle of the cut part, and the cutting flatness index can represent the flatness of the cut section.

[0021] In a preferred embodiment of the present invention, the evaluation unit compares the preset cutting flatness index of the corresponding number of laps with the actual cutting flatness index. When the preset cutting flatness index of the i-th lap is greater than the actual cutting flatness index, the difference value is added to the preset cutting flatness index of the i+1-th lap according to the weight distribution, and the difference value after the weight distribution becomes the correction amount.

[0022] To achieve the above object, the second technical solution adopted by the present invention is: a method for using a paper tube cutting device, comprising the following steps:

[0023] S1: Clamp the flat elliptical paper tube, use the automatic cross-sectional appearance detection device to detect the initial flat elliptical paper tube cross-sectional information, and send it to the processing unit to generate a cross-sectional model;

[0024] S2: the contour virtual unit generates a preset virtual contour for each circle, and generates a number of cutting points and cutting depths corresponding to the preset virtual contour;

[0025] S3: the control unit controls the linear motion and circular motion of the electric heating wire cutter according to a number of cutting points and cutting depths on the preset virtual contour of the i-th circle, so as to cut the i-th circle of the flat elliptical paper tube;

[0026] S4: the evaluation unit outputs the actual cutting flatness index of the i-th circle, corrects the preset cutting flatness index of the i+1-th circle, and outputs the correction amount;

[0027] S5: the contour virtual unit adjusts the preset virtual contour of the i+1th circle according to the correction amount, and the corresponding cutting points and cutting depths on the preset virtual contour, and the control unit controls the linear motion and circular motion of the electric heating wire cutter to achieve the i+1th circle cutting of the flat elliptical paper tube;

[0028] S6: Repeat S3-S5 to perform multiple circles of cutting until the flat oval paper tube is completely cut off.

[0029] In a preferred embodiment of the present invention, in S5, the ratio of the difference between the mean cutting depth of the i-th circle and the mean cutting depth of the i+1-th circle to the mean cutting depth of the i-th circle is 0.4-0.6, and the mean cutting depth of the first circle is half of the average wall thickness of the flat elliptical paper tube.

[0030] In a preferred embodiment of the present invention, the cutting point of the (i+1)th circle in S5 is located on the perpendicular bisector of the adjacent cutting points of the (i)th circle.

[0031] In a preferred embodiment of the present invention, in S6, when the flat oval paper tube is completely cut, i≥5.

[0032] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0033] (1) The present invention provides a paper tube cutting device, which can drive the electric wire cutter to perform circular motion and linear motion respectively through the cutting ring frame, cylinder and electric wire cutter and other components. Compared with the electric wire cutting device in the prior art, the electric wire cutter can control the cutting point and cutting depth, so that the cutting process can be adjusted according to the specifications of the flat oval paper tube, thereby ensuring the accuracy of the cut surface of the flat oval paper tube.

[0034] (2) In the present invention, a processing unit, an evaluation unit and an automatic cross-sectional appearance detection device are respectively arranged on the frame, which can generate a virtual contour to cut the flat oval paper tube, and can adjust and correct the virtual contour according to the evaluation unit. Compared with the prior art, the subsequent cutting process can be modified according to the current cutting effect, and the overall cutting process can be adjustable, so that the overall cutting is more stable and the cutting plane is smoother.

[0035] (3) In the present invention, multiple circles of cutting are performed when cutting the flat oval paper tube, and the cutting depth is progressively increased circle by circle to avoid excessive tension of the heating wire. Compared with the prior art, the tension of the heating wire can be controlled by controlling the cutting point and the cutting depth, so that the stress between the heating wire and the flat oval paper tube is uniform, thereby ensuring the cutting accuracy.

[0036] (4) In the present invention, the cutting points of the i+1th circle are respectively arranged between the adjacent cutting points of the ith circle, the average cutting depth of the i+1th circle is greater than the average depth of the ith circle, and the cutting is performed between the adjacent cutting points. The progressive cutting method of each circle can avoid repeated force at the same position of the paper tube, and the cutting process parameters are accurately calculated. Compared with the prior art, the stress concentration can be reduced, the flatness of the final cut surface can be improved, and the cutting accuracy of the cutting process can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 is a three-dimensional structural diagram of a preferred embodiment of the present invention;

[0039] Figure 2 is a three-dimensional diagram of a cutting unit according to a preferred embodiment of the present invention;

[0040] Figure 3 is a structural diagram of a cut-off adjustment system of a preferred embodiment of the present invention;

[0041] In the figure: 100, frame; 200, cutting unit; 210, cutting base; 220, cutting ring frame; 230, electric heating cutting unit; 231, support member; 232, electric heating wire cutter; 300, clamping unit. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0046] like Figure 1 and Figure 2 As shown, a paper tube cutting device includes: a frame 100, a cutting unit 200 arranged on the frame 100, and clamping units 300 arranged on both sides of the cutting unit 200.

[0047] The cutting unit 200 includes: a cutting base 210, a cutting ring frame 220 fixedly arranged on the cutting base 210, and an electric heating cutting unit 230 arranged on the cutting ring frame 220; the cutting ring frame 220 moves along the length direction of the flat elliptical paper tube; the electric heating cutting unit 230 includes: a support member 231, and an electric heating wire cutter 232 connected to the support member 231; the support member 231 drives the electric heating wire cutter 232 to move in a circle along the cutting ring frame 220, and a cylinder is arranged on the support member 231, and the cylinder drives the electric heating wire cutter 232 to move in a straight line, and the straight line movement direction of the electric heating wire cutter 232 points to the center of the cutting ring frame 220.

[0048] The clamping unit 300 is used to clamp the two ends of the flat oval paper tube. The clamping unit 300 is provided with a clamping structure, which can contact and clamp the inner side surfaces of the two ends of the flat oval paper tube to fix the flat oval paper tube. Each clamping structure includes a plurality of grippers and gripper motors, and the plurality of grippers are driven by the gripper motors to clamp the flat oval paper tube, and the gripper motors can be motors.

[0049] A plurality of clamping units 300 are located on the axis of the cutting ring frame 220, and the plurality of clamping units 300 are located on the same horizontal plane. The flat oval paper tube is horizontally arranged, and the axis of the oval cross section of the flat oval paper tube is located on the axis of the cutting ring frame 220, so that the flat oval paper tube can be made to have a highly symmetrical structure, improve the accuracy of the cutting process, and ensure the determination of the position information when adjusting the position and cutting depth of the electric heat cutting unit 230.

[0050] When cutting the paper tube, a plurality of clamping units 300 are used to clamp the flat oval paper tube horizontally, and the shape axis of the flat oval paper tube passes through the center of the circular cutting guide rail, the motor on the cutting base 210 is started, the cutting plane position is accurately found, and the motor on the support 231 and the cylinder on the support 231 are started, and the electric heating wire cutter 232 is driven to perform circular motion and centripetal linear motion in turn, so that the electric heating wire cutter 232 cuts the flat oval paper tube and then retreats until it exceeds the outer surface of the flat oval paper tube, and the cutting is pushed forward again after adjusting the cutting position.

[0051] A cutting guide rail is provided on the frame 100, and the cutting base 210 is slidably connected to the cutting guide rail. There is at least one clamping unit connected to the movable guide rail, and the extension direction of the movable guide rail is consistent with the extension direction of the cutting guide rail, so that the clamping unit 300 and the cutting guide rail can respectively perform linear motion, and can be adjusted according to the length of the flat oval and the cutting position, so that the cutting process of the flat oval paper tube can be adjustable, and can adapt to flat oval paper tubes of various specifications, thereby enhancing the applicability of the paper tube cutting and cross-sectional appearance automatic detection device.

[0052] At least one clamping unit 300 is connected to a movable rail, and the extending direction of the movable rail is consistent with the extending direction of the cutting rail. The cutting base 210 is slidably connected to the cutting rail, the support member 231 is slidably connected to the annular cutting rail, and the clamping unit 300 is connected to a movable rail and is slidably connected.

[0053] The cutting guide rail, the annular cutting guide rail and the movable guide rail are respectively provided with driving structures, the cutting base 210, the support member 231 and the clamping unit 300 are respectively connected with the driving structures on the guide rails, the cutting base 210, the support member 231 and the clamping unit 300 are respectively provided with motors, the motors respectively control the driving structures to move, the cutting base 210 and the clamping unit 300 perform parallel linear motions, and the support member 231 performs circular motions around the cutting guide rails. The driving structure can be a rack, etc., so that the cutting base 210, the support member 231 and the clamping unit 300 can move to a specified position.

[0054] The vertical plane where the heating wire on the heating wire cutter 232 is located coincides with the vertical plane where the annular cutting guide rail is located. The heating wire cutter 232 includes: a heating wire, a heating wire cutting power source, a tension adjustment unit and a tension detection unit. The linear motion direction of the heating wire is perpendicular to the tangential direction of the cutting point. The heating wire cutting power source can provide temperature for the heating wire so that the heating wire has sufficient temperature to cut the flat elliptical paper tube. The tension adjustment unit is used to adjust the tension of the heating wire. The tension adjustment unit can be a heating wire tightening device. The tension of the heating wire is adjusted by adjusting the tightness of the heating wire. The initial tension of the metal wire is adjusted before the cutting task is performed. The tension detection unit is used for real-time monitoring of the tension of the heating wire. The tension of the heating wire can be monitored in real time. It can be a tension detector to avoid excessive fluctuations in the tension of the heating wire.

[0055] The material of the heating wire can be nickel-chromium alloy or iron-chromium-aluminum alloy, and the cutting temperature is 200-300°C. Nickel-chromium alloy or iron-chromium-aluminum alloy has the characteristics of high resistivity, high melting point, good mechanical strength, etc., and can be suitable for paper tube cutting. The temperature range of 200-300°C is sufficient to melt or burn the paper or paper tube locally, thereby achieving cutting, and can avoid excessively high temperature causing large-scale damage to the paper tube.

[0056] The linear motion direction of the electric heating wire cutter 232 points to the center of the cutting ring frame 220. Since the linear motion direction points to the center of the circle, it is ensured that the cutting path of the cutter is accurate when performing linear cutting, thereby improving the accuracy and quality of cutting, and can reduce the error caused by the deviation of the cutting path, thereby improving the reliability of the entire cutting process, and helping to maintain the structural stability of the entire device, because the linear motion through the center of the circle can reduce unnecessary stress on the supporting structure.

[0057] The annular cutting guide and the electric heating wire cutter 232 are both arranged on the inner side of the cutting ring frame 220. The inner side of the cutting ring frame 220 is circular, and the annular cutting guide and the electric heating wire cutter 232 can adjust the angle to adjust the cutting angle.

[0058] Through the annular cutting guide, cylinder, electric heating wire cutter and other components, the electric heating wire cutter can be driven to perform circular motion and linear motion respectively, so that the electric heating wire cutter can control multiple angles and adjustable cutting depths, so that the cutting method can be adjusted according to the specifications of the flat oval paper tube, while ensuring the tension of the electric heating wire and the accuracy of the welding surface of the flat oval paper tube.

[0059] like Figure 3As shown, the frame 100 is provided with an automatic cross-sectional appearance detection device, a processing unit, a contour virtual unit, an evaluation unit and a control unit, which form a cutting adjustment system.

[0060] The cross-sectional appearance automatic detection device is used to detect the cross-sectional information of the initial flat elliptical paper tube and the cross-sectional information of each circle cut. The cross-sectional appearance automatic detection device is connected with the cutting unit 200, the clamping unit 300 and the cross-sectional appearance automatic detection device.

[0061] The automatic detection device for cross-sectional appearance can be one or more of a camera, a laser scanner, an inductive sensor and an ultrasonic detector, and the corresponding detection methods are visual detection, laser scanning detection, inductive detection and ultrasonic detection. Through detection, automatic high-precision detection of the cut surface of the flat oval paper tube can be achieved to ensure product quality and improve production efficiency. When using ultrasonic detection, the device used is an ultrasonic detector, which releases ultrasonic waves. After the ultrasonic waves come into contact with the cross section, they rebound, so that the rebound ultrasonic wave value matches the cross-sectional shape. The ultrasonic detector is in an on state before cutting, so that the cross-sectional shape of the initial flat oval paper tube and the cross-sectional shape of each cut can be detected.

[0062] The processing unit, the contour virtual unit and the evaluation unit can be computers or computer programs, including but not limited to components such as a central processing unit, a memory, an information transmission pipeline and a user interface. The processing unit is connected to the tension detection unit and can receive the tension information detected by the tension detection unit.

[0063] The processing unit is connected to the cross-section appearance automatic detection device to generate a cross-section model, and the cross-section model is updated according to the cross-section information of each circle cut. Finite element analysis is used in model construction. Finite element analysis is a powerful numerical technology that can simulate complex physical phenomena and is suitable for predicting physical behavior during the cutting process to improve the accuracy of the model. The virtual model models the cross section of the flat oval paper tube according to the detection information of the flat oval paper tube by the cross-section appearance automatic detection device.

[0064] The contour virtual unit receives the cross-sectional model output by the processing unit, generates a preset virtual contour for each circle, generates a number of cutting points and cutting depths corresponding to the preset virtual contour, and outputs a preset cutting flatness index for the preset virtual contour for each circle; wherein the cutting depth is the amount of motion of the electric heating wire cutter 232 in linear motion; the cutting point is the circumferential position corresponding to the midpoint of the electric heating wire cutter 232; the cutting depth refers to the cutting distance of the electric heating wire cutter 232 on the outer surface of the flat elliptical paper tube, and the cutting process of the flat elliptical paper tube and the adjustment process of the cutting point are performed separately.

[0065] The evaluation unit outputs the actual cutting flatness index of each circle according to the cross-sectional model updated by the processing unit, corrects the preset cutting flatness index of the preset virtual contour of each circle, and outputs the correction amount; the cutting flatness index refers to the flatness index of the cutting section when cutting in the flat elliptical paper tube, the cutting section is the section of the cutting part, and the cutting flatness index can represent the flatness of the cutting section.

[0066] Since the heating wire tension changes during the cutting process, when making clear adjustments to the cutting point and cutting depth, the change in the heating wire tension will cause the actual cutting profile to deviate from the first virtual profile. The evaluation unit compares the preset cutting flatness index of the corresponding number of turns with the actual cutting flatness index. When the preset cutting flatness index of the i-th turn is greater than the actual cutting flatness index, the difference value is added to the preset cutting flatness index of the i+1th turn according to the weight distribution. The difference value after weight distribution becomes the correction value, so that the overall cutting flatness index is maintained. When the preset cutting flatness index of the i-th turn is less than or equal to the actual cutting flatness index, the preset cutting flatness index of the i+1th turn is maintained.

[0067] The cutting flatness during cutting is represented by the cutting flatness index Q. The larger the cutting flatness index is, the better the cutting flatness is and the higher the cutting flatness is. The cutting flatness index is represented as follows:

[0068]

[0069] Among them, Q i is the cutting flatness index in the i-th cutting cycle, T j is the wire tension at the jth cutting point in the i-th circle, T0 is the predetermined value of the wire tension, C j is the cutting curvature at the jth cutting site in the i-th circle, D j is the increase in cutting depth at the jth cutting site in the i-th circle, A is the ratio of the major axis to the minor axis of the flat elliptical paper tube, e is a natural constant, α is the cutting depth influence index, β is the curvature influence index, and the value ranges of α and β are 1-2 and 0-1 respectively.

[0070] It represents the influence of the metal wire tension and the cutting curvature at the cutting site on the cutting flatness. It represents the difference ratio between the metal wire tension in the cutting site and the predetermined tension. When the difference between the metal wire tension in the cutting site and the predetermined value of the metal wire tension is too large, the influence of the metal wire tension and the cutting curvature at the cutting site on the cutting smoothness will be reduced, resulting in reduced cutting smoothness; when the cutting curvature at the cutting site is too large, the influence of the metal wire tension and the cutting curvature at the cutting site on the cutting smoothness will be reduced.

[0071] It represents the influence of the cutting depth at the cutting point. The increase in cutting depth is the difference between the cutting depth at the jth cutting point in the i-th circle and the average cutting depth of the i-1th circle. When the cutting depth is too large, the cutting force will be unbalanced, causing the flat oval paper tube to deform and the cutting to be uneven.

[0072] The cut flatness index Q can be expressed as:

[0073]

[0074] Among them, ω i is the weight ratio in the i-th cut, ω i The value range of is 0-1, and ω i The value of increases with the increase of i, that is, the later the number of cut-off turns, the higher the proportion. a represents the number of turns when completely cut off. The above formula is weighted by the cut-off flatness index of each turn and then averaged, so that the importance of the cut-off flatness index of each turn is expressed, and ω i The value of increases with the value of i, which means that the later the cutting number is, the more important it is. As the number of cutting circles increases, each cutting goes deeper into the paper tube than the previous one, which can gradually reduce the remaining part of the paper tube, thereby reducing the risk of deformation or rupture of the paper tube that may be caused by one-time cutting.

[0075] The contour virtual unit adjusts the preset virtual contour and the corresponding several cutting points and cutting depths on the preset virtual contour according to the correction amount; the preset virtual contour of each circle refers to the preset contour line of the divided cutting on the flat elliptical paper tube, and the contour line of the virtual contour is the preset cutting depth boundary line of each circle cutting operation. The contour virtual unit generates the number of cutting circles and the preset virtual contour of each circle according to the cross-sectional model generated by the processing unit.

[0076] The control unit is connected to the contour virtual unit, and is used to control the linear motion and circular motion of the electric heating wire cutter 232, and the electric heating wire cutting power source and the tension adjustment unit on the electric heating wire cutter 232 according to the cutting point and the cutting depth. The control unit can be a plurality of controllers, which can control the components on the cutting unit 200 and the clamping unit 300 to work. Through the tension adjustment unit, the tension of the electric heating wire can be adjusted, so that the cutting flatness index can be affected to improve the flatness of the cut section.

[0077] A number of cutting points and cutting depths are determined according to a preset virtual contour, and when the cutting point is selected, the curvature of the cutting point is recorded. The cutting points of the i+1th circle are respectively set between the adjacent cutting points of the ith circle, and the average cutting depth of the i+1th circle is greater than the average cutting depth of the ith circle.

[0078] The cutting points of the i+1th circle are set between the adjacent cutting points of the ith circle. The number of cutting points in each circle is the same, which is n. When the number of cutting circles is i, there are several cutting sites set on the ith circle, and the several cutting sites are N (i)1 、N (i)2 ...N (i)n When the number of cutting cycles is i+1, the cutting sites are N (i+1)1 、N (i+1) 2...N (i+1)n , then there exists N (i+1)1 Located in N (i)1 and N (i)2 Between (i+1)2 Located in N (i)2 and N (i)3 And so on, each cutting point of the subsequent circle is located between the adjacent cutting points of the previous circle.

[0079] The cutting points of the i+1th circle are respectively arranged between the adjacent cutting points of the i-th circle, the average cutting depth of the i+1th circle is greater than the average depth of the i-th circle, and cutting is performed between adjacent cutting points. The cutting method of progressive cutting is circle by circle, which can avoid repeated force at the same position of the paper tube, accurately calculate the cutting process parameters, reduce stress concentration, improve the flatness of the final cut surface, and improve the cutting accuracy of the cutting process.

[0080] To achieve the above object, the second technical solution adopted by the present invention is: a method for using a paper tube cutting device, comprising the following steps:

[0081] S1: Clamp the flat oval paper tube, use the cross-section appearance automatic detection device to detect the initial flat oval paper tube cross-section information, and send it to the processing unit to generate a cross-section model. The cross-section model can accurately predict the cutting result, reduce the error and uncertainty in the actual cutting, and help to discover potential quality problems in advance, so as to make adjustments before the actual cutting.

[0082] S2: The contour virtual unit generates a preset virtual contour for each circle, and generates a number of cutting points and cutting depths corresponding to the preset virtual contour.

[0083] S3: The control unit controls the linear motion and circular motion of the electric heating wire cutter according to a number of cutting points and cutting depths on the preset virtual contour of the i-th circle, so as to cut the i-th circle of the flat elliptical paper tube;

[0084] S4: the evaluation unit outputs the actual cutting flatness index of the i-th circle, corrects the preset cutting flatness index of the i+1-th circle, and outputs the correction amount;

[0085] S5: The contour virtual unit adjusts the preset virtual contour of the i+1th circle according to the correction amount, and the corresponding cutting points and cutting depths on the preset virtual contour, and the control unit controls the linear motion and circular motion of the electric heating wire cutter to achieve the i+1th circle cutting of the flat elliptical paper tube. The difference between the mean value of the cutting depth of the i-th circle and the mean value of the cutting depth of the i+1th circle is 0.4-0.6 to the mean value of the cutting depth of the i-th circle, and the mean value of the cutting depth of the first circle is half of the average wall thickness of the flat elliptical paper tube.

[0086] The average cutting depth of the first circle is half of the average wall thickness of the flat oval paper tube. By gradually increasing the cutting depth of each circle, the cutting process can be controlled more accurately, reducing the one-time stress on the paper tube, thereby reducing the risk of deformation or damage of the paper tube during the cutting process, and avoiding one-time cutting too deep to cause the paper tube to rupture or damage.

[0087] It is expressed as:

[0088]

[0089] Where D(i+1)j represents the cutting depth of the jth point in the next circle, and D(i)j represents the cutting depth of the jth point in the next circle. i represents the cutting circle sequence number, and j represents the cutting point sequence number.

[0090] The cutting point of the i+1th circle is located on the perpendicular bisector of the adjacent cutting points of the ith circle. The cutting points of the i+1th circle are respectively located on the perpendicular bisectors of the adjacent cutting points of the ith circle, which can clarify the position of the cutting points and ensure the accuracy of the cutting process.

[0091] S6: Repeat S3-S5 to perform multiple circles of cutting until the flat oval paper tube is completely cut off.

[0092] During the cutting process, multiple cutting cycles are performed, and cross-sectional information of the cutting contour is collected after each cutting cycle. The obtained cross-sectional information is collected, a cross-sectional contour is generated based on the cross-sectional information, the cross-sectional contour is compared with the virtual contour, and the subsequent virtual contour is adjusted based on the overlap between the cross-sectional contour and the virtual contour.

[0093] In S6, when the flat oval paper tube is completely cut, i≥5. Among them, a≥5, by cutting at least five times, it can be ensured that the flat oval paper tube is completely cut, avoiding quality problems caused by incomplete cutting. Cutting a thicker paper tube at one time may cause greater pressure on the cutter, increasing the risk of equipment failure. Cutting in multiple times can disperse this pressure and reduce the possibility of equipment damage.

[0094] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A paper tube cutting device, comprising: A frame, a cutting unit arranged on the frame, and clamping units arranged on both sides of the cutting unit, characterized in that: The clamping unit is used to clamp the two ends of the flat oval paper tube; The cutting unit comprises: a cutting base, a cutting ring frame fixedly arranged on the cutting base, and an electric heating cutting unit arranged on the cutting ring frame; the cutting ring frame moves along the length direction of the flat elliptical paper tube; the electric heating cutting unit comprises: a support member, and an electric heating wire cutter connected to the support member; the support member drives the electric heating wire cutter to move along the circumference of the cutting ring frame, a cylinder is arranged on the support member, and the cylinder drives the electric heating wire cutter to move linearly, and the linear movement direction of the electric heating wire cutter points to the center of the cutting ring frame; The frame is provided with an automatic cross-section appearance detection device, a processing unit, a contour virtual unit, an evaluation unit and a control unit; The cross-sectional appearance automatic detection device is used to detect the cross-sectional information of the initial flat elliptical paper tube and the cross-sectional information of each circle cut; The processing unit is connected to the cross-sectional appearance automatic detection device to generate a cross-sectional model, and updates the cross-sectional model according to the cross-sectional information of each cutting cycle; The contour virtual unit receives the cross-sectional model output by the processing unit, generates a preset virtual contour for each circle, generates a number of cutting points and cutting depths corresponding to the preset virtual contour, and outputs a preset cutting flatness index for the preset virtual contour for each circle; wherein the cutting depth is the amount of linear motion of the electric heating wire cutter; The evaluation unit outputs an actual cut-off smoothness index of each circle according to the cross-sectional model updated by the processing unit, corrects a preset cut-off smoothness index of the preset virtual profile of each circle, and outputs a correction amount; The contour virtual unit adjusts the preset virtual contour, and a number of cutting points and cutting depths corresponding to the preset virtual contour according to the correction amount; The control unit is connected to the contour virtual unit and is used to control the linear motion and circular motion of the heating wire cutter according to the cutting point and the cutting depth.

2. A paper tube cutting device according to claim 1, characterized in that: The heating wire cutter comprises: a heating wire, a tension adjustment unit and a tension detection unit. The linear motion direction of the heating wire is perpendicular to the tangential direction of the cutting point. The tension adjustment unit is used to adjust the tension of the heating wire. The tension detection unit is used to monitor the tension of the heating wire in real time.

3. A paper tube cutting device according to claim 1, characterized in that: The preset virtual contour of each circle refers to the preset contour line of the cutting in circles on the flat elliptical paper tube. The contour line of the virtual contour is the preset cutting depth boundary line of each circle cutting operation. The contour virtual unit generates the number of cutting circles and the preset virtual contour of each circle according to the cross-sectional model generated by the processing unit.

4. A paper tube cutting device according to claim 1, characterized in that: Several cutting points and cutting depths are determined according to a preset virtual contour, the cutting points of the i+1th circle are respectively set between adjacent cutting points of the i-th circle, and the average cutting depth of the i+1th circle is greater than the average cutting depth of the i-th circle.

5. The paper tube cutting device according to claim 1, characterized in that: The cutting flatness index is: the flatness index of the cut section in the flat elliptical paper tube, the cut section is the section of each circle of the cut part, and the cutting flatness index can indicate the flatness of the cut section.

6. A paper tube cutting device according to claim 1, characterized in that: The evaluation unit compares the preset cutting flatness index of the corresponding number of laps with the actual cutting flatness index. When the preset cutting flatness index of the i-th lap is greater than the actual cutting flatness index, the difference value is added to the preset cutting flatness index of the i+1-th lap according to the weight distribution, and the difference value after weight distribution becomes the correction value.

7. A method for using a paper tube cutting device, based on the paper tube cutting device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Clamp the flat elliptical paper tube, use the automatic cross-sectional appearance detection device to detect the initial flat elliptical paper tube cross-sectional information, and send it to the processing unit to generate a cross-sectional model; S2: the contour virtual unit generates a preset virtual contour for each circle, and generates a number of cutting points and cutting depths corresponding to the preset virtual contour; S3: the control unit controls the linear motion and circular motion of the electric heating wire cutter according to a number of cutting points and cutting depths on the preset virtual contour of the i-th circle, so as to cut the i-th circle of the flat elliptical paper tube; S4: the evaluation unit outputs the actual cutting flatness index of the i-th circle, corrects the preset cutting flatness index of the i+1-th circle, and outputs the correction amount; S5: the contour virtual unit adjusts the preset virtual contour of the i+1th circle according to the correction amount, and the corresponding cutting points and cutting depths on the preset virtual contour, and the control unit controls the linear motion and circular motion of the electric heating wire cutter to achieve the i+1th circle cutting of the flat elliptical paper tube; S6: Repeat S3-S5 to perform multiple circles of cutting until the flat oval paper tube is completely cut off.

8. The method for using the paper tube cutting device according to claim 7, characterized in that: In S5, the ratio of the difference between the mean cutting depth of the i-th circle and the mean cutting depth of the i+1-th circle to the mean cutting depth of the i-th circle is 0.4-0.6, and the mean cutting depth of the first circle is half of the average wall thickness of the flat elliptical paper tube.

9. The method for using the paper tube cutting device according to claim 7, characterized in that: The cutting point of the (i+1)th circle in S5 is located on the perpendicular bisector of the adjacent cutting point of the (i)th circle.

10. The method for using the paper tube cutting device according to claim 7, characterized in that: In S6, when the flat oval paper tube is completely cut, i≥5.

Images