Printing device and printing method for producing medical device packaging bags

Abstract

The present invention relates to the field of medical device technology, and specifically to a printing device and printing method for producing medical device packaging bags, including an anti-sticking mechanism, an anti-wrinkle mechanism, a visual recognition device, a pressure sensor, an angle sensor, a central processing unit and an early warning module. The present invention uses a central processing unit to control the anti-sticking mechanism and the anti-wrinkle mechanism to cooperate with each other, and the provided pressure sensor, angle sensor and visual recognition device respectively detect the wrinkle degree, flatness and adhesion of the packaging bag, and the provided early warning module suspends the operation of the printing device after receiving an alarm signal, thereby effectively ensuring the printing quality of the packaging bag, and also ensuring that the medical device packaging bag does not suffer safety accidents such as damage and tearing during the printing process.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device packaging, and in particular to a printing device and a printing method for producing medical device packaging bags. Background Art

[0002] Medical device products refer to instruments, equipment, appliances, in vitro diagnostic reagents and calibrators, materials and other similar or related items that are used directly or indirectly on the human body. Medical device products require the use of special sterile packaging bags. Such sterile packaging bags can provide microbial barrier properties, protect medical device products before and after sterilization, and maintain the sterile environment inside the sterile packaging bags for a certain period of time (marked validity period) after sterilization.

[0003] At present, most packaging bags for medical devices are made of plastic materials (such as PE, PP, PVC, PS, etc.), cardboard materials, or polymer film materials. These materials have a certain degree of toughness and are often wrinkled or warped due to external forces such as extrusion and collision during the production and transportation process. If these wrinkles or warps are not handled properly, they will seriously affect the printing quality of the medical device packaging bags. In the prior art, these wrinkles or warps usually need to be smoothed out before printing. For example, the patent with announcement number CN114987044B discloses a "printing device for packaging bag production", which is provided with a hot pressing mechanism for hot pressing a conveyed film, and a smoothing mechanism is provided on the fixed frame for smoothing the film simultaneously when the hot pressing mechanism is hot pressing. Although this smoothing operation can smooth the packaging bag, the smoothing operation adopts a comprehensive pressing method. If the surface of the packaging bag itself already has wrinkles, the smoothing operation will aggravate the wrinkles on the surface of the packaging bag.

[0004] In addition, water-based environmentally friendly ink is usually used as the printing material for printing medical device packaging bags. Since water-based environmentally friendly ink itself has a certain viscosity, after the printing block is printed on the packaging bag, a certain degree of stickiness will appear between the printing block and the packaging bag. When the printing block is reset, it is easy to cause the sticky packaging bag to move synchronously, making the printed font or pattern unclear, seriously affecting the printing quality of the packaging bag.

[0005] In addition, due to the special application requirements of medical device packaging bags, it is necessary to ensure that the medical device packaging bags are not damaged, torn, or other accidents during the printing process. Otherwise, once the sterile environment of the medical device packaging bags is destroyed, it will cause serious harm to subsequent users of the medical device products.

[0006] In view of the above-mentioned many technical problems in the prior art, it is urgent to design a printing device and a printing method for producing medical device packaging bags to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of the present invention is to design a printing device and printing method for the production of medical device packaging bags, which can solve the above technical problems in the prior art, can effectively smooth out the wrinkles or warping of the packaging bags of medical device products, and ensure that the printing block does not drive the sticky packaging bags to move synchronously when it is reset. At the same time, it can control the strength of various auxiliary operations before and after printing, and ensure that the packaging bags of medical devices will not be damaged, torn, or other accidents during the printing process. The present invention has a simple structure, is easy to operate, safe and reliable, and can significantly improve the printing quality and subsequent use safety of medical device packaging bags.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A printing device for producing medical device packaging bags, comprising a conveying platform, a bracket fixedly mounted on the upper end of the conveying platform, a hydraulic cylinder fixedly mounted on the upper end of the bracket, a lifting plate fixedly mounted on the lower end of the hydraulic cylinder, a cylinder fixedly mounted on the middle part of the lower end of the lifting plate, and a printing block fixedly mounted on the lower end of the cylinder;

[0010] Anti-sticking mechanisms are located on both sides of the printing block and are symmetrically arranged to prevent the printing block from sticking to the packaging bag and being sucked up when the printing block leaves the packaging bag after completing the printing action;

[0011] Anti-wrinkle mechanisms, located at the four end corners of the lifting plate, are used to prevent wrinkles from appearing on the surface of the packaging bag when printing on the packaging bag;

[0012] A visual recognition device is located at the front and rear sides of the lower end of the lifting plate, and is used to obtain surface image information and position information of the packaging bag in real time, and monitor the real-time position of the anti-sticking mechanism and the anti-wrinkle mechanism;

[0013] a pressure sensor, located on the anti-sticking mechanism, for monitoring the real-time pressure of the anti-sticking mechanism;

[0014] an angle sensor, located on the anti-wrinkle mechanism, for monitoring the real-time angle of the anti-wrinkle mechanism;

[0015] The central processing unit can receive real-time data information from the hydraulic cylinder, visual recognition device, pressure sensor and angle sensor, and after judgment and processing, send out control signals to control the actions of the hydraulic cylinder, anti-sticking mechanism and anti-wrinkle mechanism.

[0016] Preferably, the anti-sticking mechanism includes pressing plates arranged on the left and right sides of the printing block, and electric telescopic rods are fixedly installed on the middle of the upper ends of the pressing plates, and the upper ends of the electric telescopic rods are fixedly installed on the lifting plate.

[0017] Preferably, the electric telescopic rod can receive a control signal from the central processor to generate a telescopic action.

[0018] Preferably, the anti-wrinkle mechanism includes anti-wrinkle blocks arranged at the four corners of the lower side of the lifting plate, the middle part of the anti-wrinkle blocks are hinged with connecting rods, the upper side of the connecting rods are rotatably installed with hinge shafts, and the hinge shafts are fixedly installed at the four corners of the lower end of the lifting plate.

[0019] Preferably, the angle sensors are arranged at the connecting rods corresponding to the four corners of the lower end of the lifting plate, and are used to monitor the angle value between the connecting rod and the bottom surface of the lifting plate.

[0020] Preferably, the visual recognition device obtains surface image information and position information of the packaging bag, and feeds it back to the central processor for data analysis and processing, so as to determine whether the wrinkle degree, flatness and adhesion of the packaging bag meet preset values.

[0021] Preferably, it also includes an early warning module, which receives data information from the pressure sensor and the angle sensor, and sends an alarm signal to the central processor when the preset threshold is exceeded. The central processor suspends the operation of the printing device after receiving the alarm signal.

[0022] Another aspect of the present invention provides a printing method for medical device packaging bags, which uses the printing device for producing medical device packaging bags, comprising the following steps:

[0023] S1: The conveyor table stops after it transports the packaging bags to be printed to the lower side of the printing block;

[0024] S2: Start the hydraulic cylinder to extend downward, driving the lifting plate to descend, and the lifting plate drives the articulated shaft, connecting rod and anti-wrinkle block to descend synchronously. The central processing unit receives the angle value detected by the angle sensor and stops the hydraulic cylinder when it reaches the preset value θ1;

[0025] S3: The central processing unit performs data analysis on the surface image information of the packaging bag obtained by the visual recognition device, and determines whether the wrinkle degree and flatness of the packaging bag meet the requirements; if yes, proceed to the next step; if not, start the hydraulic cylinder to retract upward and return to step S2;

[0026] S4: Start the electric telescopic rod and extend it downward, driving the pressing plate to move downward and compact the packaging bag.

[0027] Then start the cylinder to drive the printing block down, and the printing block prints the packaging bag;

[0028] S5: After printing is completed, the cylinder drives the printing block to rise;

[0029] S6: The central processing unit performs data analysis on the position information of the packaging bag obtained by the visual recognition device, and determines whether the adhesion of the packaging bag meets the requirements;

[0030] If yes, the printing quality of the packaging bag is judged to be qualified; if no, the printing quality of the packaging bag is judged to be unqualified;

[0031] S7: Printing is completed, and the process returns to step S1 to start printing the next packaging bag.

[0032] Preferably, the central processing unit detects the signal of the early warning module in real time, and suspends the operation of the printing device when the central processing unit receives the alarm signal.

[0033] Preferably, in step S6, when it is determined that the printing quality of the packaging bag is unqualified, the central processing unit records the real-time pressure information of the pressure sensor, records the real-time angle information of the angle sensor, and records the real-time position information of the anti-sticking mechanism and the anti-wrinkle mechanism, and performs data analysis for subsequent evaluation and improvement of the printing quality.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. In the present invention, after the conveyor platform transports the packaging bags to be printed to the lower side of the printing block, the conveyor platform stops temporarily, the hydraulic cylinder is started to drive the lifting plate to descend, and the lifting plate drives the hinge shaft, connecting rod and anti-wrinkle block to descend synchronously. Since the anti-wrinkle block is at the lowest height compared to the pressure plate and the printing block, the anti-wrinkle block will first fit in contact with the four corners of the surface of the packaging bag on the upper end of the conveyor platform. As the hydraulic cylinder drives the lifting plate to continue to descend, the connecting rod will rotate on the hinge shaft, compressing the elastic part, and also causing the anti-wrinkle block to rotate on the connecting rod, so that the lower end surface of the anti-wrinkle block always keeps in contact with the packaging bag in a sliding state, and the anti-wrinkle block is arranged on the friction of the anti-slip strip Under the action of force, the four corners of the packaging bag will be pushed outward, so that the surface of the packaging bag is straightened, avoiding wrinkles on the surface of the packaging bag, which will affect the subsequent printing quality. By straightening the four corners of the packaging bag outward, there will be no strip-shaped ridges on the surface of the packaging bag when it is straightened left and right or front and back, which can ensure the good straightening quality of the surface of the packaging bag. The angle sensor is convenient for detecting the outward rotation angle of the connecting rod and the anti-wrinkle block, avoiding the situation where the packaging bag has not been completely straightened due to the inadequate rotation angle of the connecting rod and the anti-wrinkle block, thereby ensuring the straightening quality of the packaging bag by the connecting rod and the anti-wrinkle block.

[0036] 2. In the present invention, after the pressure plate has finished pressing the anti-wrinkle block, the central processing unit controls the electric telescopic rod to extend downward, thereby driving the pressure plate to move downward, and the set pressure plate is convenient for contacting and pressing the left and right sides of the packaging bag, and then the cylinder is started to drive the printing block to move downward, and the printing block prints the packaging bag. After printing is completed, the cylinder drives the printing block to rise. Since the pressure plate continues to press the packaging bag under the action of the electric telescopic rod, it is avoided that when the printing block rises and resets, the packaging bag is stuck to the printing block under the action of the viscosity of the printing pigment, and the situation of synchronous rising occurs. In addition, the pressure sensor is provided to facilitate the detection of the pressure applied by the electric telescopic rod to the pressure plate, thereby avoiding the relaxation of the pressing force of the pressure plate on the packaging bag due to insufficient pressure applied by the pressure plate, ensuring that sufficient pressure is applied to the packaging bag, and ensuring that after printing, the packaging bag will not stick and warp due to the viscosity of the pigment, thereby improving the printing quality of the packaging bag.

[0037] 3. In the present invention, the surface image information and position information of the packaging bag are obtained by the visual recognition device, and fed back to the central processing unit for data analysis and processing, so as to determine whether the wrinkle degree, flatness and adhesion of the packaging bag meet the preset values, so as to adjust the printing action in time to ensure printing quality.

[0038] 4. In the present invention, an early warning module is set up, which receives data information from the pressure sensor and the angle sensor. When the preset threshold is exceeded, an alarm signal is sent to the central processing unit. After receiving the alarm signal, the central processing unit suspends the operation of the printing device to avoid accidents such as damage and tearing of the packaging bags of medical devices during the printing process.

[0039] 5. In the present invention, when it is determined that the printing quality of the packaging bag is unqualified, the central processing unit records the real-time pressure information of the pressure sensor, the real-time angle information of the angle sensor, and the real-time position information of the anti-sticking mechanism and the anti-wrinkle mechanism, and performs data analysis for subsequent evaluation and improvement of the printing quality, thereby achieving continuous improvement of the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0041] Figure 2 This is a bottom-up perspective structural diagram of the printing block and the bracket in the present invention;

[0042] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0043] Figure 4 This is a schematic diagram of a control system for the printing method of the present invention;

[0044] Figure 5 This is a flow chart of the printing method control method of the present invention.

[0045] In the figure: 1, conveyor; 2, bracket; 3, hydraulic cylinder; 4, lifting plate; 5, printing block; 51, cylinder;

[0046] 6. Anti-sticking mechanism; 61. Pressing plate; 62. Electric telescopic rod; 63. Pressure sensor;

[0047] 7. Anti-wrinkle mechanism; 71. Anti-wrinkle block; 72. Connecting rod; 73. Articulated shaft; 74. Elastic member; 75. Anti-slip strip; 76. Angle sensor;

[0048] 8. Visual recognition device. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0050] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0051] Reference Figure 1 、 Figure 2 and Figure 3 A printing device for producing medical device packaging bags includes a conveying table 1, a bracket 2 is fixedly installed on the upper end of the conveying table 1, a hydraulic cylinder 3 is fixedly installed on the upper end of the bracket 2, a lifting plate 4 is fixedly installed on the lower end of the hydraulic cylinder 3, a cylinder 51 is fixedly installed in the middle of the lower end of the lifting plate 4, and a printing block 5 is fixedly installed on the lower end of the cylinder 51; it also includes

[0052] The anti-sticking mechanism 6 is located on both sides of the printing block 5 and is symmetrically arranged to prevent the printing block 5 from sticking to the packaging bag when leaving the packaging bag after completing the printing action;

[0053] Medical device packaging bags are usually printed with water-based environmentally friendly ink as the printing material. Since the water-based environmentally friendly ink itself has a certain viscosity, after the printing block has completed printing on the packaging bag, a certain degree of stickiness will appear between the printing block and the packaging bag. When the printing block is reset, it is easy to cause the sticky packaging bag to move synchronously, making the printed font or pattern unclear, seriously affecting the printing quality of the packaging bag. Through the setting of the anti-sticking mechanism 6, the packaging bag can be pressed when the printing block is reset to prevent the packaging bag from being lifted up when the printing block is reset.

[0054] The anti-wrinkle mechanism 7 is located at the four end corners of the lifting plate 4 and is used to prevent wrinkles from appearing on the surface of the packaging bag when printing on the packaging bag; the anti-wrinkle mechanism 7 is located at the four end corners of the lifting plate 4 and can straighten the four corners of the packaging bag at the same time, thereby effectively improving the flatness and wrinkle degree of the packaging bag.

[0055] The visual recognition device 8 is located on the front and rear sides of the lower end of the lifting plate 4 and is used to obtain the surface image information and position information of the packaging bag in real time, and monitor the real-time position of the anti-sticking mechanism 6 and the anti-wrinkle mechanism 7; the visual recognition device 8 can specifically be a high-speed camera.

[0056] A pressure sensor 63 is located on the anti-sticking mechanism 6 and is used to monitor the real-time pressure of the anti-sticking mechanism 6;

[0057] An angle sensor 76 , located on the anti-wrinkle mechanism 7 , for monitoring the real-time angle of the anti-wrinkle mechanism 7 ;

[0058] The central processing unit can receive real-time data information from the hydraulic cylinder 3, visual recognition device 8, pressure sensor 63 and angle sensor 76, and after judgment and processing, send out control signals and control the actions of the hydraulic cylinder 3, anti-sticking mechanism 6 and anti-wrinkle mechanism 7.

[0059] The anti-sticking mechanism 6 includes pressing plates 61 arranged on the left and right sides of the printing block 5 , and an electric telescopic rod 62 is fixedly installed in the middle of the upper end of the pressing plate 61 , and the upper end of the electric telescopic rod 62 is fixedly installed on the lifting plate 4 .

[0060] The electric telescopic rod 62 can receive the control signal from the central processor to generate a telescopic action.

[0061] The anti-wrinkle mechanism 7 includes anti-wrinkle blocks 71 disposed at the four corners of the lower side of the lifting plate 4. Connecting rods 72 are hingedly connected to the middle of each anti-wrinkle block 71. A hinge shaft 73 is rotatably mounted through the upper side of each connecting rod 72. The hinge shaft 73 is fixedly mounted at the four corners of the lower end of the lifting plate 4. An elastic member 74, specifically a torsion spring, is sleeved on the hinge shaft 73. A plurality of anti-slip strips 75 are fixedly mounted at the lower end of each anti-wrinkle block 71. The anti-slip strip 75 on the side near the printing block 5 is curved. Since the surface of the packaging bag is relatively smooth, the curved shape of the anti-slip strip can further enhance the anti-slip effect.

[0062] Angle sensors 76 are located at the four corners of the lower end of the lift plate 4, corresponding to the connecting rods 72, and are used to monitor the angle between the connecting rods 72 and the bottom surface of the lift plate 4. This angle detection serves two purposes: first, it provides the angle value to the early warning module to prevent accidents such as damage or tearing of the packaging bag due to excessive tension caused by excessive angles; second, it records the angle value when printing quality meets standards, providing a reference for subsequent evaluation and improvement of printing quality.

[0063] The visual recognition device 8 obtains the surface image information and position information of the packaging bag and feeds it back to the central processor for data analysis and processing, so as to determine whether the wrinkle degree, flatness and adhesion of the packaging bag meet the preset values.

[0064] Specifically, the real-time surface image information and position information of the packaging bag obtained by the visual recognition device 8 are subjected to data analysis and compared with the pre-stored surface image information of the packaging bag that meets the requirements to determine whether the packaging bag is wrinkled or warped, and whether the packaging bag is adhered and sucked up due to the departure of the printing block 5, thereby determining whether the wrinkle degree, flatness and adhesion of the packaging bag meet the requirements.

[0065] It also includes an early warning module, which receives data information from the pressure sensor 63 and the angle sensor 76, and sends an alarm signal to the central processing unit when the preset threshold is exceeded. After receiving the alarm signal, the central processing unit suspends the operation of the printing device to avoid accidents such as damage or tearing of the packaging bags of medical devices during the printing process.

[0066] Reference Figure 4 and Figure 5 A printing method for medical device packaging bags, using the printing device for producing medical device packaging bags, comprises the following steps:

[0067] S1: The conveyor 1 delivers the packaging bag to be printed to the lower side of the printing block 5 and then pauses;

[0068] S2: The hydraulic cylinder 3 is started to extend downward, driving the lifting plate 4 to descend. The lifting plate 4 drives the hinge shaft 73, the connecting rod 72 and the anti-wrinkle block 71 to descend synchronously. The central processing unit receives the angle value detected by the angle sensor 76 and stops the hydraulic cylinder 3 when it reaches the preset value θ1;

[0069] S3: The central processing unit performs data analysis on the surface image information of the packaging bag obtained by the visual recognition device 8, and determines whether the wrinkle degree and flatness of the packaging bag meet the requirements; if yes, proceed to the next step; if not, start the hydraulic cylinder 3 to retract upward and return to step S2;

[0070] S4: Start the electric telescopic rod 62 to extend downward, driving the pressing plate 61 to move downward to compact the packaging bag.

[0071] Then the cylinder 51 is started to drive the printing block 5 downward, and the printing block 5 prints the packaging bag;

[0072] S5: After printing is completed, the cylinder 51 drives the printing block 5 to rise;

[0073] S6: The central processing unit performs data analysis on the position information of the packaging bag obtained by the visual recognition device 8, and determines whether the adhesion of the packaging bag meets the requirements;

[0074] If yes, the printing quality of the packaging bag is judged to be qualified; if no, the printing quality of the packaging bag is judged to be unqualified;

[0075] S7: Printing is completed, and the process returns to step S1 to start printing the next packaging bag.

[0076] The central processing unit detects the signal of the early warning module in real time, and suspends the operation of the printing device when the central processing unit receives the alarm signal.

[0077] In step S2, the setting of the preset value θ1 can be determined based on the actual size, material and other information of the packaging bag. A reasonable preset value θ1 is calculated based on the strength of the packaging bag. It is necessary to ensure that the wrinkle degree and flatness of the packaging bag meet the requirements while the tension on the packaging bag is not too large, so as to avoid accidents such as damage and tearing of the packaging bag of medical devices during the printing process.

[0078] In step S6, when it is determined that the printing quality of the packaging bag is unqualified, the central processing unit records the real-time pressure information of the pressure sensor 63, the real-time angle information of the angle sensor 76, and the real-time position information of the anti-sticking mechanism 6 and the anti-wrinkle mechanism 7, and performs data analysis, such as using a BP neural network learning algorithm for training, to analyze the data information when the printing quality of the packaging bag is unqualified, optimize and adjust the position of the anti-sticking mechanism 6 and the anti-wrinkle mechanism 7, and optimize and adjust the values of the pressure sensor 63 and the angle sensor 76 for subsequent evaluation and improvement of the printing quality.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printing method for medical device packaging bags, using a printing device for producing medical device packaging bags, characterized in that: The printing device comprises: A conveying platform (1) is provided, wherein a bracket (2) is fixedly mounted on the upper end of the conveying platform (1), a hydraulic cylinder (3) is fixedly mounted on the upper end of the bracket (2), a lifting plate (4) is fixedly mounted on the lower end of the hydraulic cylinder (3), a cylinder (51) is fixedly mounted on the middle part of the lower end of the lifting plate (4), and a printing block (5) is fixedly mounted on the lower end of the cylinder (51); the conveying platform (1) is characterized in that it also includes an anti-sticking mechanism (6) located on both sides of the printing block (5) and symmetrically arranged, and used to prevent the printing block (5) from sticking to the packaging bag and sucking it up when leaving the packaging bag after completing the printing action; an anti-wrinkle mechanism (7), located at the four end corners of the lifting plate (4), for preventing wrinkles from appearing on the surface of the packaging bag when printing on the packaging bag; A visual recognition device (8) is located at the front and rear sides of the lower end of the lifting plate (4), and is used to obtain surface image information and position information of the packaging bag in real time, and to monitor the real-time positions of the anti-sticking mechanism (6) and the anti-wrinkle mechanism (7); a pressure sensor (63), located on the anti-sticking mechanism (6), for monitoring the real-time pressure of the anti-sticking mechanism (6); an angle sensor (76), located on the anti-wrinkle mechanism (7), for monitoring the real-time angle of the anti-wrinkle mechanism (7); The central processing unit can receive real-time data information from the hydraulic cylinder (3), the visual recognition device (8), the pressure sensor (63) and the angle sensor (76), and after judgment and processing, send a control signal to control the actions of the hydraulic cylinder (3), the anti-sticking mechanism (6) and the anti-wrinkle mechanism (7); The anti-sticking mechanism (6) comprises pressing plates (61) arranged on the left and right sides of the printing block (5), wherein an electric telescopic rod (62) is fixedly mounted on the middle of the upper end of each pressing plate (61), and the upper end of the electric telescopic rod (62) is fixedly mounted on the lifting plate (4); The electric telescopic rod (62) can receive a control signal from the central processing unit to generate a telescopic action; The anti-wrinkle mechanism (7) comprises anti-wrinkle blocks (71) arranged at the four corners of the lower side of the lifting plate (4), the middle of the anti-wrinkle blocks (71) are hinged with connecting rods (72), the upper side of the connecting rods (72) are rotatably installed with hinge shafts (73), and the hinge shafts (73) are fixedly installed at the four corners of the lower end of the lifting plate (4); The angle sensors (76) are arranged at the four corners of the lower end of the lifting plate (4) corresponding to the connecting rods (72) and are used to monitor the angle value between the connecting rods (72) and the lower bottom surface of the lifting plate (4); The visual recognition device (8) obtains surface image information and position information of the packaging bag and feeds it back to the central processing unit for data analysis and processing, thereby determining whether the wrinkle degree, flatness and adhesion of the packaging bag meet preset values; The printing method comprises the following steps: S1: The conveyor (1) delivers the packaging bag to be printed to the lower side of the printing block (5) and then pauses; S2: The hydraulic cylinder (3) is started to extend downward, driving the lifting plate (4) to descend, and the lifting plate (4) drives the hinge shaft (73), the connecting rod (72) and the anti-wrinkle block (71) to descend synchronously, and the central processing unit receives the angle value detected by the angle sensor (76), and stops the hydraulic cylinder (3) after reaching the preset value θ1; S3: The central processing unit performs data analysis on the surface image information of the packaging bag obtained by the visual recognition device (8), and determines whether the wrinkle degree and flatness of the packaging bag meet the requirements; if yes, proceed to the next step; if not, start the hydraulic cylinder (3) to retract upwards and return to step S2; S4: Start the electric telescopic rod (62) to extend downward, drive the pressing plate (61) to descend, and compact the packaging bag. Then the cylinder (51) is started to drive the printing block (5) to descend, and the printing block (5) prints the packaging bag; S5: After printing is completed, the cylinder (51) drives the printing block (5) to rise; S6: The central processing unit performs data analysis and processing on the position information of the packaging bag obtained by the visual recognition device (8), and determines whether the adhesion of the packaging bag meets the requirements; If yes, the printing quality of the packaging bag is judged to be qualified; if no, the printing quality of the packaging bag is judged to be unqualified; S7: Printing is completed, and the process returns to step S1 to start printing the next packaging bag.

2. The printing method for medical device packaging bags according to claim 1, characterized in that: The printing device further comprises an early warning module, which receives data information from the pressure sensor (63) and the angle sensor (76), and sends an alarm signal to the central processing unit when a preset threshold is exceeded. The central processing unit suspends the operation of the printing device after receiving the alarm signal.

3. The printing method for medical device packaging bags according to claim 2, characterized in that: The early warning module receives data information from the pressure sensor (63) and the angle sensor (76) in real time, and suspends the operation of the printing device when the central processing unit receives the alarm signal.

4. The printing method for medical device packaging bags according to claim 3, characterized in that: In step S6, when it is determined that the printing quality of the packaging bag is unqualified, the central processing unit records the real-time pressure information of the pressure sensor (63), the real-time angle information of the angle sensor (76), and the real-time position information of the anti-sticking mechanism (6) and the anti-wrinkle mechanism (7), and performs data analysis for subsequent evaluation and improvement of the printing quality.

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