Valve bag folding forming detection device

Abstract

The invention discloses a valve bag folding forming detection device, and relates to the technical field of paper valve bag manufacturing. The valve bag folding forming detection device comprises a machine body, a conveying module and a folding module which are arranged on a folding forming machine, and a rough detection mechanism used for detecting the folding state of a valve bag is arranged at the top of a mounting plate (10). The device comprises a machine body, a conveying module, a folding module and a rough detection mechanism, the rough detection mechanism makes contact with a folding part through a ball, the thickness change of the folding part is sensed in real time, a pointer is driven to rotate through a push rod, the position of the pointer is recognized through an industrial camera, and whether folding is in place or not is judged. And meanwhile, the device is further provided with a vibration mechanism and a flattening mechanism, the fine detection mechanism can conduct detection when abnormal folding is detected, the folding state can be detected on line, the folding forming quality and consistency can be improved, and the device is suitable for an automatic valve bag production line.

Description

Technical Field

[0001] This invention relates to the field of paper valve bag manufacturing technology, specifically a valve bag folding and forming detection device. Background Technology

[0002] Valve bags, with their built-in valve structure, automated filling capability, and excellent sealing and leak-proof performance, are widely used in the packaging of powdered or granular materials such as dry building materials, chemical raw materials, and feed. Among them, paper valve bags occupy a large market share due to their environmental friendliness, recyclability, printability, and moderate cost. The production process of paper valve bags typically involves using multi-layer kraft paper as raw material to first produce continuous valve bag tubing, followed by processes such as cutting to length, folding both ends, and gluing the valve to obtain the finished product. The folding and forming process is one of the core processes that determines the structural stability, dimensional accuracy, and subsequent reliability of the valve bag, and it is mainly carried out by automated folding and forming equipment.

[0003] Publication No. CN102225630A discloses a valve bag folding and forming detection device and a valve bag folding method. However, it lacks an online detection method for the folding quality. After folding, operators can typically only visually inspect whether the folding is in place and whether the folded edges are flat, making real-time, continuous detection and control impossible. When defects such as incomplete folding, improper folding, or curling folded edges occur, they are difficult to detect and handle in a timely manner, leading to a large number of defective products, increasing production costs and material waste. Secondly, the internal stress generated during the folding process cannot be effectively released. After storage, stacking, transportation, and filling, the folded edges of the valve bag are prone to tearing and damage, increasing the risk of packaging loss and material waste. Summary of the Invention

[0004] The purpose of this invention is to provide a valve bag folding and forming detection device and folding method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a valve pocket folding and forming detection device, comprising a body, a conveying module, and a folding module mounted on a folding and forming machine. The top of the body is connected to multiple mounting plates via a moving mechanism, and the top of the mounting plates is connected to a lifting plate via a first lifting mechanism. Multiple arrayed moving rods are inserted into the top of the lifting plate, and ball bearings are provided at the bottom of the moving rods. A disc is fixedly connected to the upper end of the moving rod, and a gravity disc is fixedly connected to the top of the disc. A pressure plate is connected to the side wall of the mounting plate via a second lifting mechanism, and an inclined plate is fixedly connected to the side wall of the pressure plate. The top of the mounting plate is provided with a coarse inspection mechanism for detecting the folded state of the valve pocket. The coarse inspection mechanism includes a first support frame fixedly connected to the top of the mounting plate, and a pointer is rotatably connected to the side wall of the first support frame via a torque shaft. A mounting block is fixedly connected to the top of the mounting plate, and an arc-shaped scale is fixedly connected to the top of the mounting block. A second support frame is fixedly connected to the top of the mounting plate, and an industrial camera is fixedly inserted into the side wall of the second support frame. An L-shaped push rod is fixedly connected to the side wall of the lifting plate, and the end of the push rod can slide on the top of the pointer.

[0006] Preferably, it also includes a precision inspection mechanism installed on the machine body. The precision inspection mechanism includes a laser displacement sensor and a data processing module. The laser displacement sensor is installed on the second mounting bracket and aligned with the folded part of the folded valve bag. The industrial camera is used to acquire the position image of the pointer on the dial and make a preliminary judgment. When the preliminary judgment result is that the folding is abnormal, the laser displacement sensor is triggered to perform a high-precision scan and verification of the folded part.

[0007] Preferably, the data processing module has a built-in two-level discrimination algorithm, including: Level 1: Image processing-based pointer position recognition algorithm. The algorithm acquires the dial image through an industrial camera. After image preprocessing, pointer edge extraction, and scale positioning, it identifies the scale value indicated by the pointer and determines whether it is within the preset qualified range. If it exceeds the range, it is judged as a preliminary abnormality. The second level is a laser scanning-based folded contour reconstruction algorithm. When a preliminary anomaly is detected, the laser displacement sensor is triggered to perform a lateral scan of the folded part to obtain the two-dimensional contour data of the folded part. The actual folded curve is obtained by fitting it with the least squares method, and compared with the standard template curve to calculate the deviation area and the maximum deviation value, and output a quantitative detection report.

[0008] Preferably, the moving mechanism includes a fixed plate fixedly connected to the top of the machine body, and a cylinder is fixedly connected to the side wall of the fixed plate, with the telescopic end of the cylinder fixed to the side wall of the mounting plate.

[0009] Preferably, the first lifting mechanism includes a fixed frame fixedly connected to the top of the mounting plate, and the side wall of the fixed frame is rotatably connected to a cam via a rotating shaft. The cam can slide at the bottom of the lifting plate, and the rotation of the rotating shaft is driven by a driving mechanism.

[0010] Preferably, the drive mechanism includes a gear fixedly sleeved on the side wall of the rotating shaft, and a first mounting bracket is fixedly connected to the top of the machine body. A rack is fixedly connected to the top of the first mounting bracket, and the rack meshes with the gear.

[0011] Preferably, the second lifting mechanism includes a lifting block, and the pressure plate is connected to the bottom of the lifting block via a first spring telescopic rod. The lifting block is connected to the side wall of the mounting plate via a reset mechanism, and the movement of the lifting block is driven by a pushing mechanism.

[0012] Preferably, the reset mechanism includes a support plate fixedly connected to the side wall of the mounting plate, and the lifting block is connected to the bottom of the support plate via a second spring telescopic rod.

[0013] Preferably, the pushing mechanism includes a second mounting bracket on the top of the machine body, and a triangular block is fixedly connected to the bottom of the second mounting bracket. The top of the lifting block is connected to a pushing pin through a one-way rotation mechanism, and the upper end of the pushing pin can slide on the side wall of the triangular block.

[0014] Preferably, the unidirectional rotation mechanism includes a base fixedly connected to the top of the lifting block, and two symmetrically arranged support blocks are fixedly connected to the top of the base. The sidewalls of the support blocks are rotatably connected to rotating blocks via rotating pins, and the rotating blocks are fixed to the lower end of the push pin. A torsion spring is fixedly connected between the rotating pin and the support blocks, and a stop block is fixedly connected to the top of the base.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This valve bag folding and forming detection device and folding method, through the setting of a first lifting mechanism, etc., during the manufacturing process, the valve bag tubular fabric is conveyed by a conveying module, and the two ends are folded by a folding module. After folding, a cylinder drives the mounting plate to move closer to the fixed plate, and at the same time, it drives multiple moving rods to move, so that the ball can roll on the folded valve bag. When the gear and rack mesh, they can drive the gear to rotate, which in turn drives the cam to rotate through the rotating shaft. When the tip of the cam abuts against the bottom of the lifting plate, it can push the lifting plate to move upward. At the same time, the disc drives the moving rods and ball to move upward, and drives the gravity plate to move upward. When the tip of the cam passes the bottom of the lifting plate, the lifting plate can move downward and reset under the gravity of the gravity plate, and drive the moving rods and ball to move downward, so that the ball abuts against the folded part. This process is repeated, so that the ball can repeatedly tap and vibrate the folded part, which can release some of the internal stress in the folded part, make the folded material more compliant, improve the structural toughness, and improve the quality of folding and forming.

[0016] By setting up a two-stage inspection mechanism of coarse and fine inspection, a balance between inspection efficiency and accuracy is achieved. The coarse inspection mechanism uses an industrial camera combined with a mechanical pointer structure to quickly identify obvious folding defects, meeting the real-time requirements of high-speed production lines. The fine inspection mechanism uses a high-precision laser displacement sensor to perform contour scanning and 3D reconstruction of suspected defects, achieving micron-level quantitative detection through least squares fitting and deviation analysis. The two-stage discrimination algorithm integrates multiple mathematical methods such as image processing, curve fitting, and deviation calculation, enabling the device to have intelligent diagnostic capabilities from "whether it is qualified" to "how much deviation," significantly improving the technical content and practical value of the inspection system.

[0017] The precision inspection mechanism of this valve bag folding and forming inspection device, through a folding contour reconstruction algorithm based on the least squares method, can accurately restore the three-dimensional shape of the folded part and quantitatively compare it with the standard template curve to calculate the deviation area and the maximum deviation value. This quantitative inspection method overcomes the limitation of traditional inspection methods that can only make qualitative judgments, providing data support for subsequent process optimization and quality traceability, and demonstrating the technological progress of this invention in the field of intelligent inspection.

[0018] This valve bag folding forming detection device and folding method, by setting up a flattening mechanism, allows the pressure plate and inclined plate to move synchronously via a second lifting mechanism when the mounting plate moves. After the tapping and vibration are completed, when the upper end of the push pin abuts against the side wall of the triangular block, the stop block prevents the push pin from rotating counterclockwise, thus pushing the push pin downward. Simultaneously, the lifting block moves downward via a one-way rotation mechanism, and the second spring telescopic rod is stretched, which in turn drives the pressure plate and inclined plate downward via the first spring telescopic rod. When the pressure plate abuts against the folded part, the first spring telescopic rod can be gradually... Gradual compression flattens the folded area, expelling trapped air and creating a plastic shaping effect on the folded edge, completely preventing it from opening or curling. Furthermore, after flattening, the folded area is free of bulges and curling, resulting in a flat and regular shape for the valve pocket, improving the quality of the folding process. When the upper end of the push pin passes the triangular block, the lifting block moves upward and resets under the action of the second spring telescopic rod, and drives the pressure plate upward and resets via the first spring telescopic rod. When the mounting plate resets, and the push pin abuts against the triangular block, the push pin rotates clockwise along the rotating pin, preventing the lifting block from moving downward. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the mounting plate in this invention; Figure 3 This is a schematic diagram of the structure of the first lifting mechanism in this invention; Figure 4 This is a schematic diagram of the structure of the second lifting mechanism in this invention; Figure 5 This is a schematic diagram of the unidirectional rotation mechanism in this invention; Figure 6 This is a schematic diagram of the rough inspection mechanism in this invention; Figure 7 This is a schematic diagram of the drive mechanism in this invention; Figure 8 This is a schematic diagram of the valve pocket after it has been folded and formed in this invention; Figure 9 This is a flowchart of the present invention.

[0020] In the diagram: 101, machine body; 102, conveying module; 103, folding module; 201, fixing plate; 202, cylinder; 301, fixing frame; 302, rotating shaft; 303, cam; 401, gear; 402, first mounting frame; 403, rack; 501, lifting block; 502, first spring telescopic rod; 601, support plate; 602, second spring telescopic rod; 701, second mounting frame; 702, triangular block; 703, push pin; 801, base. ; 802, Support block; 803, Rotating pin; 804, Rotating block; 805, Torsion spring; 806, Stop block; 901, First support frame; 902, Torsion shaft; 903, Pointer; 904, Mounting block; 905, Dial; 906, Second support frame; 907, Industrial camera; 908, Push rod; 10, Mounting plate; 11, Lifting plate; 12, Moving rod; 13, Ball bearing; 14, Disc; 15, Gravity disc; 16, Pressure plate; 17, Inclined plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-8This invention provides a valve bag folding and forming detection device, including a body 101, a conveying module 102, and a folding module 103 mounted on a folding and forming machine. These are all well-known technologies in this field and will not be described in detail here. The top of the body 101 is connected to multiple mounting plates 10 via a moving mechanism, and the top of the mounting plates 10 is connected to a lifting plate 11 via a first lifting mechanism. Multiple arrayed moving rods 12 are inserted into the top of the lifting plate 11, and ball bearings 13 are provided at the bottom of the moving rods 12. A disc 14 is fixedly connected to the upper end of the moving rods 12, and a gravity disc 15 is fixedly connected to the top of the disc 14. The side wall of the mounting plate 10 is connected to a pressure plate 16 via a second lifting mechanism, and an inclined plate 17 is fixedly connected to the side wall of the pressure plate 16. This device can reciprocate and vibrate the folded part, releasing some of the internal stress in the folded part, making the folded material more compliant, improving the structural toughness, and after vibration, can flatten the folded part, thereby improving the quality of valve bag folding and forming.

[0023] Please see Figure 3 and Figure 6 The top of the mounting plate 10 is equipped with a coarse inspection mechanism for detecting the folded state of the valve bag. The coarse inspection mechanism includes a first support frame 901 fixedly connected to the top of the mounting plate 10, with a pointer 903 rotatably connected to the side wall of the first support frame 901 via a torque shaft 902. A mounting block 904 is fixedly connected to the top of the mounting plate 10, and an arc-shaped scale 905 is fixedly connected to the top of the mounting block 904. A second support frame 906 is fixedly connected to the top of the mounting plate 10, and an industrial camera 907 is fixedly inserted into the side wall of the second support frame 906. An L-shaped push rod 908 is fixedly connected to the side wall of the lifting plate 11, and the end of the push rod 908 can slide on the top of the pointer 903. Because the folded portion of the valve bag is thicker at the edges and thinner in the middle, when the ball bearing 13 rolls on the top of the folded portion, it pushes the moving rod 12 upward when it encounters the thicker part. The disk 14 drives the gravity disk 15 to move upward, and when the disk 14 moves upward, it can drive the push rod 908 to move upward. At this time, the pointer 903 can rotate counterclockwise under the action of the torque shaft 902. When the ball 13 encounters a thin part, the moving rod 12 and the disk 14 can move downward under the action of the gravity disk 15, and drive the push rod 908 downward, so that the end of the push rod 908 abuts against the top of the pointer 903, which can push the pointer 903 to rotate clockwise along the torque shaft 902. Furthermore, the industrial camera 907 observes the changes in the scale indicated by the pointer 903 on the scale 905. The industrial camera 907 acquires the image of the pointer 903 on the scale 905 in real time, and identifies the pointer position through the image processing algorithm to preliminarily judge whether the folding is in place. It can detect missed folds or incomplete folding in time, ensuring the quality of folding.

[0024] The present invention also includes a precision inspection mechanism disposed on the body 101. The precision inspection mechanism includes a laser displacement sensor and a data processing module. The laser displacement sensor is mounted on the second mounting bracket 701 and aligned with the folded part of the folded valve pocket. The industrial camera 907 is used to acquire the position image of the pointer 903 on the dial 905 and make a preliminary judgment. When the preliminary judgment result is that the folding is abnormal, the laser displacement sensor is triggered to perform a high-precision scan and verification of the folded part.

[0025] The precision inspection mechanism includes a laser displacement sensor mounted on the second mounting bracket 701 and a data processing module (not shown in the figure) electrically connected to the industrial camera 907 and the laser displacement sensor. The laser displacement sensor is a Keyence LK-G5000 series high-speed laser displacement sensor, with a measurement frequency up to 392kHz and a repeatability of 0.005μm, enabling high-speed, high-precision contour scanning of the folded portion. The laser displacement sensor is mounted aligned with the folded portion of the folded valve pocket and can move laterally along the folded portion under the drive of the drive mechanism.

[0026] Specifically, the data processing module has a built-in two-level discrimination algorithm, including: Level 1: The pointer position recognition algorithm based on image processing acquires the image of the dial 905 through the industrial camera 907. After image preprocessing, pointer edge extraction, and scale positioning, it identifies the scale value indicated by the pointer 903 and determines whether it is within the preset qualified range. If it exceeds the range, it is judged as a preliminary abnormality.

[0027] The industrial camera 907 acquires grayscale images of the dial 905. First, median filtering is performed for noise reduction, using the formula: g(x,y)=med{f(xk,yl), (k,l∈W)}, where W is the filtering window, typically a 3×3 window. After noise reduction, the Canny edge detection operator is used to extract pointer edges. The Canny operator calculates the image gradient magnitude and direction, performs non-maximum suppression and double thresholding, and obtains an edge image with a single pixel width.

[0028] Then, the line where the pointer is located is detected using the Hough transform. The parameter space of the Hough transform is represented as ρ = x cosθ + ysinθ, where ρ is the distance from the origin to the line, and θ is the angle between the normal to the line and the x-axis. Accumulated votes are made in the parameter space, and the (ρ, θ) corresponding to the peak value is the parameter of the line where the pointer is located. Based on the coordinates of the pointer's end point and the center coordinates of the dial, the pointer rotation angle θ_pointer is calculated and compared with the preset standard rotation angle θ_std. If |θ_pointer - θ_std| > θ_threshold, a preliminary anomaly is identified, triggering a detailed inspection to initiate a review.

[0029] The second level is a laser scanning-based folded contour reconstruction algorithm. When a preliminary anomaly is detected, the laser displacement sensor is triggered to perform a lateral scan of the folded part to obtain the two-dimensional contour data of the folded part. The actual folded curve is obtained by fitting it with the least squares method, and compared with the standard template curve to calculate the deviation area and the maximum deviation value, and output a quantitative detection report.

[0030] When the initial assessment by industrial camera 907 indicates a folding anomaly, the data processing module issues a command to activate the laser displacement sensor to perform a lateral scan of the folded area. The laser displacement sensor moves laterally along the folded area at equal intervals, collecting distance data d_i (i=1,2,...,N) at N measurement points. Based on the sensor's installation position and movement trajectory, the distance data is converted into three-dimensional coordinates (x_i, y_i, z_i) of the folded area through coordinate transformation, where x_i is the lateral position coordinate, y_i is the longitudinal position coordinate (which can be considered constant), and z_i is the height coordinate.

[0031] To reconstruct the precise contour of the folded area, the least squares method is used to perform curve fitting on the collected point cloud data. Let the fitting polynomial be: z = a_0 + a_1x + a_2x^2 + ... + a_mx^m Where m is the order of the polynomial, typically 3 to 5 orders are sufficient for fitting most folded profiles. The sum of squared residuals is minimized by solving the normal equation: S = Σ(z_i - Σa_jx_i^j)^2 → min Taking the partial derivative of S and setting it to zero, we obtain the normal equations: ∂S / ∂a_j = -2Σ(z_i - Σa_kx_i^k)x_i^j = 0, j=0,1,...,m Summarized as follows: Σ(Σa_kx_i^k)x_i^j = Σz_i x_i^j This can be written in matrix form as: X^TX a = X^T z, where X is the Vandermonde matrix, a is the coefficient vector, and z is the height vector. Solving this system of linear equations yields the polynomial coefficients a_j.

[0032] After fitting the actual folded curve f_fit(x), it is compared with the pre-stored standard template curve f_std(x), and the deviation area and maximum deviation value are calculated: Deviation area: S = ∫|f_fit(x) - f_std(x)|dx, where the integration interval is the lateral width of the folded part; Maximum deviation: D_max = max|f_fit(x) - f_std(x)| When S > S_threshold or D_max > D_threshold, the folding quality is deemed unqualified. The data processing module outputs a detailed inspection report, including information such as deviation location, deviation amount, and deviation area, for operators or the host computer system to perform subsequent processing.

[0033] Please see Figure 2 The moving mechanism includes a fixed plate 201 fixedly connected to the top of the body 101. A cylinder 202 is fixedly connected to the side wall of the fixed plate 201, and the telescopic end of the cylinder 202 is fixed to the side wall of the mounting plate 10. When the cylinder 202 is activated, the mounting plate 10 can be moved through the telescopic end.

[0034] Please see Figure 2 , Figure 3 and Figure 7 The first lifting mechanism includes a fixed frame 301 fixedly connected to the top of the mounting plate 10, and a cam 303 is rotatably connected to the side wall of the fixed frame 301 via a rotating shaft 302. The cam 303 can slide at the bottom of the lifting plate 11, and the rotation of the rotating shaft 302 is driven by a drive mechanism. The drive mechanism drives the rotating shaft 302 to rotate, and at the same time, drives the cam 303 to rotate. When the tip of the cam 303 abuts against the bottom of the lifting plate 11, it can push the lifting plate 11 to move upward.

[0035] Please see Figure 2 and Figure 7 The drive mechanism includes a gear 401 fixedly sleeved on the side wall of the rotating shaft 302, and a first mounting bracket 402 fixedly connected to the top of the body 101. A rack 403 is fixedly connected to the top of the first mounting bracket 402, and the rack 403 is meshed with the gear 401. When the gear 401 meshes with the rack 403, it can drive the gear 401 to rotate, thereby driving the cam 303 to rotate through the rotating shaft 302.

[0036] Please see Figure 3 and Figure 4The second lifting mechanism includes a lifting block 501, and the pressing plate 16 is connected to the bottom of the lifting block 501 via a first spring telescopic rod 502. The lifting block 501 is connected to the side wall of the mounting plate 10 via a reset mechanism, and the movement of the lifting block 501 is driven by a pushing mechanism. The lifting block 501 moves up and down via the pushing mechanism and the reset mechanism, and the pressing plate 16 moves up and down via the first spring telescopic rod 502. When the pressing plate 16 moves downward, when the pressing plate 16 abuts against the folded part, the first spring telescopic rod 502 can be gradually compressed, thereby flattening the folded part, expelling the interlayer air, and at the same time, allowing the folded edge to produce a plastic shaping effect, completely avoiding the folded edge from opening or curling. Furthermore, after flattening, there are no bulges or curling at the folded part, and the valve pocket as a whole has a flat and regular shape, improving the quality of folding and forming.

[0037] Please see Figure 4 The reset mechanism includes a support plate 601 fixedly connected to the side wall of the mounting plate 10, and the lifting block 501 is connected to the bottom of the support plate 601 through the second spring telescopic rod 602, which guides and resets the lifting block 501.

[0038] Please see Figure 2 , Figure 4 and Figure 5 The pushing mechanism includes a second mounting bracket 701 on the top of the body 101, and a triangular block 702 is fixedly connected to the bottom of the second mounting bracket 701. The top of the lifting block 501 is connected to a push pin 703 through a one-way rotation mechanism, and the upper end of the push pin 703 can slide on the side wall of the triangular block 702. When the mounting plate 10 moves towards the fixed plate 201, when the upper end of the push pin 703 abuts against the side wall of the triangular block 702, the push pin 703 cannot rotate counterclockwise under the action of the one-way rotation mechanism, thereby pushing the push pin 703 to move downward. At the same time, the lifting block 501 is driven to move downward through the one-way rotation mechanism. Meanwhile, the second spring telescopic rod 602 is stretched, and the pressure plate 16 and the inclined plate 17 are driven to move downward through the first spring telescopic rod 502.

[0039] Please see Figure 5The one-way rotation mechanism includes a base 801 fixedly connected to the top of the lifting block 501, and two symmetrically arranged support blocks 802 fixedly connected to the top of the base 801. The side wall of the support block 802 is rotatably connected to a rotating block 804 via a rotating pin 803, and the rotating block 804 is fixed to the lower end of the push pin 703. A torsion spring 805 is fixedly connected between the rotating pin 803 and the support block 802, and a stop block 806 is fixedly connected to the top of the base 801. When the upper end of the push pin 703 abuts against the side wall of the triangular block 702, the push pin 703 cannot rotate counterclockwise under the action of the stop block 806. When the mounting plate 10 moves and resets, when the push pin 703 abuts against the triangular block 702, the push pin 703 can rotate clockwise along the rotating pin 803. At this time, the lifting block 501 will not be pushed to move downward.

[0040] The valve bag folding and forming detection device of the present invention includes the following steps in its implementation: S1: During manufacturing, the valve bag tube cloth is conveyed by the conveying module 102 and folded at both ends by the folding module 103. After folding, the mounting plate 10 is moved closer to the fixed plate 201 by the cylinder 202. At the same time, multiple moving rods 12 are moved so that the ball bearings 13 can roll on the folded valve bag. S2: When gear 401 meshes with rack 403, it can drive gear 401 to rotate, thereby driving cam 303 to rotate through shaft 302. When the tip of cam 303 abuts against the bottom of lifting plate 11, it can push lifting plate 11 to move upward. At the same time, it drives moving rod 12 and ball 13 to move upward through disc 14, and drives gravity disc 15 to move upward. When the tip of cam 303 passes the bottom of lifting plate 11, lifting plate 11 can move downward and reset under the gravity of gravity disc 15, and drive moving rod 12 and ball 13 to move downward, so that ball 13 abuts against the folded part. By repeating this process, ball 13 can repeatedly tap and vibrate the folded part, which can release some of the internal stress of the folded part, make the folded material more compliant, improve structural toughness, and improve the quality of folding. S3: When the mounting plate 10 moves, the second lifting mechanism can drive the pressure plate 16 and the inclined plate 17 to move synchronously. After the tapping vibration is completed, when the upper end of the push pin 703 abuts against the side wall of the triangular block 702, the stop block 806 prevents the push pin 703 from rotating counterclockwise, thus pushing the push pin 703 to move downward. At the same time, the lifting block 501 is driven downward through the one-way rotation mechanism. Simultaneously, the second spring telescopic rod 602 is stretched, and the first spring telescopic rod 502 drives the pressure plate 16 and the inclined plate 17 to move downward. When the pressure plate 10 moves downward... When the first spring telescopic rod 502 comes into contact with the folded part, it can be gradually compressed, thereby flattening the folded part, expelling the air in the sandwich, and at the same time, it can produce a plastic shaping effect on the folded edge, completely avoiding the folded edge from opening or curling. Moreover, after flattening, there are no bulges or curling at the folded part, and the valve pocket is in a flat and regular shape, improving the quality of folding. When the upper end of the push pin 703 passes the triangular block 702, the lifting block 501 can move upward and reset under the action of the second spring telescopic rod 602, and drive the pressing plate 16 to move upward and reset through the first spring telescopic rod 502. S4: Because the thickness of the folded parts of the valve bag is thicker at both ends and thinner in the middle, when the ball bearing 13 rolls on the top of the folded part, it will push the moving rod 12 upward when it encounters the thick part. At the same time, the disk 14 drives the gravity disk 15 upward. When the disk 14 moves upward, it can drive the push rod 908 upward. At this time, the pointer 903 can rotate counterclockwise under the action of the torque shaft 902. When the ball bearing 13 encounters the thin part, the moving rod 12 and the disk 14 can move downward under the action of the gravity disk 15, and drive the push rod 908 downward. This makes the end of the push rod 908 abut against the top of the pointer 903, which can push the pointer 903 to rotate clockwise along the torque shaft 902. Furthermore, by observing the changes in the scale on the dial 905 indicated by the pointer 903 through the industrial camera 907, the folding state of the valve bag can be preliminarily detected. It can be detected in time when there is a missed fold or the folding is not in place, so as to ensure the quality of the folding. S5: After the flattening is completed, the mounting plate 10 is moved and reset by the moving mechanism. When the mounting plate 10 is moved and reset, when the push pin 703 abuts against the triangular block 702, the push pin 703 can rotate clockwise along the rotating pin 803. At this time, the lifting block 501 will not be pushed to move downward.

[0041] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A valve bag folding and forming detection device, comprising a body (101), a conveying module (102), and a folding module (103) mounted on a folding and forming machine, characterized in that: The top of the body (101) is connected to multiple mounting plates (10) via a moving mechanism, and the top of the mounting plates (10) is connected to a lifting plate (11) via a first lifting mechanism. Multiple arrayed moving rods (12) are inserted into the top of the lifting plate (11), and ball bearings (13) are provided at the bottom of the moving rods (12). A disc (14) is fixedly connected to the upper end of the moving rods (12), and a gravity disc (15) is fixedly connected to the top of the disc (14). A pressure plate (16) is connected to the side wall of the mounting plate (10) via a second lifting mechanism, and an inclined plate (17) is fixedly connected to the side wall of the pressure plate (16). The top of the mounting plate (10) is provided with a coarse inspection mechanism for detecting the folding state of the valve pocket. The coarse inspection mechanism includes a first support frame (901) fixedly connected to the top of the mounting plate (10), and a pointer (903) is rotatably connected to the side wall of the first support frame (901) via a torsion shaft (902). The top of the mounting plate (10) is fixedly connected with a mounting block (904), and an arc-shaped dial (905) is fixedly connected to the top of the mounting block (904). The top of the mounting plate (10) is fixedly connected with a second support frame (906), and an industrial camera (907) is fixedly inserted into the side wall of the second support frame (906). The side wall of the lifting plate (11) is fixedly connected with an L-shaped push rod (908), and the end of the push rod (908) can slide on the top of the pointer (903).

2. The valve pocket folding and forming detection device according to claim 1, characterized in that: It also includes a precision inspection mechanism set on the body (101), the precision inspection mechanism includes a laser displacement sensor and a data processing module, the laser displacement sensor is installed on the second mounting bracket (701) and aligned with the folded part of the folded valve bag; the industrial camera (907) is used to collect the position image of the pointer (903) on the dial (905) and make a preliminary judgment. When the preliminary judgment result is that the folding is abnormal, the laser displacement sensor is triggered to perform a high-precision scan and verification of the folded part.

3. The valve bag folding and forming detection device according to claim 2, characterized in that: The data processing module has a built-in two-level discrimination algorithm, including: Level 1: Image processing-based pointer position recognition algorithm. The industrial camera (907) acquires the image of the dial (905). After image preprocessing, pointer edge extraction and scale positioning, the algorithm identifies the scale value indicated by the pointer (903) and determines whether it is within the preset qualified range. If it exceeds the range, it is judged as a preliminary abnormality. The second level is a laser scanning-based folded contour reconstruction algorithm. When a preliminary anomaly is detected, the laser displacement sensor is triggered to perform a lateral scan of the folded part to obtain the two-dimensional contour data of the folded part. The actual folded curve is obtained by fitting it with the least squares method, and compared with the standard template curve to calculate the deviation area and the maximum deviation value, and output a quantitative detection report.

4. The valve pocket folding and forming detection device according to claim 1, characterized in that: The moving mechanism includes a fixed plate (201) fixedly connected to the top of the body (101), and a cylinder (202) is fixedly connected to the side wall of the fixed plate (201), and the telescopic end of the cylinder (202) is fixed to the side wall of the mounting plate (10).

5. The valve pocket folding and forming detection device according to claim 1, characterized in that: The first lifting mechanism includes a fixed frame (301) fixedly connected to the top of the mounting plate (10), and a cam (303) is rotatably connected to the side wall of the fixed frame (301) via a rotating shaft (302). The cam (303) can slide at the bottom of the lifting plate (11), and the rotation of the rotating shaft (302) is driven by a driving mechanism.

6. The valve pocket folding and forming detection device according to claim 5, characterized in that: The drive mechanism includes a gear (401) fixedly sleeved on the side wall of the rotating shaft (302), and a first mounting bracket (402) is fixedly connected to the top of the body (101). A rack (403) is fixedly connected to the top of the first mounting bracket (402), and the rack (403) meshes with the gear (401).

7. The valve pocket folding and forming detection device according to claim 1, characterized in that: The second lifting mechanism includes a lifting block (501), and the pressure plate (16) is connected to the bottom of the lifting block (501) through a first spring telescopic rod (502). The lifting block (501) is connected to the side wall of the mounting plate (10) through a reset mechanism, and the movement of the lifting block (501) is driven by a pushing mechanism.

8. The valve bag folding and forming detection device according to claim 7, characterized in that: The reset mechanism includes a support plate (601) fixedly connected to the side wall of the mounting plate (10), and the lifting block (501) is connected to the bottom of the support plate (601) through a second spring telescopic rod (602).

9. The valve pocket folding and forming detection device according to claim 8, characterized in that: The pushing mechanism includes a second mounting bracket (701) on the top of the body (101), and a triangular block (702) is fixedly connected to the bottom of the second mounting bracket (701). The top of the lifting block (501) is connected to a push pin (703) through a one-way rotation mechanism, and the upper end of the push pin (703) can slide on the side wall of the triangular block (702).

10. A valve pocket folding and forming detection device according to claim 9, characterized in that: The one-way rotation mechanism includes a base (801) fixedly connected to the top of the lifting block (501), and two symmetrically arranged support blocks (802) fixedly connected to the top of the base (801). A rotating block (804) is rotatably connected to the side wall of the support block (802) through a rotating pin (803), and the rotating block (804) is fixed to the lower end of the push pin (703). A torsion spring (805) is fixedly connected between the rotating pin (803) and the support block (802), and a stop block (806) is fixedly connected to the top of the base (801).

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