Device, system and method for relieving impact force of pneumatic mechanism

Abstract

The device comprises an air cylinder, a main path electromagnetic valve, a branch path electromagnetic valve, a one-way valve and a sealing container, the air cylinder is communicated with the main path electromagnetic valve, and the main path electromagnetic valve controls switching and discharging of an air source on the extending side of the air cylinder and an air source on the contracting side of the air cylinder. The main electromagnetic valve is arranged on a pipeline between the air cylinder and the main electromagnetic valve, the one-way valve is arranged on one connecting pipeline between the air cylinder and the main electromagnetic valve, the branch electromagnetic valve is communicated with a pipeline between the one-way valve and the air cylinder, and the sealing container is communicated with the branch electromagnetic valve. When the air cylinder drives the scraping arm mechanism to press downwards, the branch electromagnetic valve is opened, and part of compressed air is guided into the sealed container to be stored, so that the movement speed of the air cylinder is effectively buffered, the impact force is remarkably reduced, the clamping injury risk caused by misjudgment of operation or non-timely evacuation of hands is avoided, and the safety of the large-scale pneumatic silk-screen printing equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic mechanisms, and in particular to a device, system and method for alleviating the impact force of a pneumatic mechanism. Background Art

[0002] Screen printing is a type of stencil printing. The principle of stencil printing is that during printing, a certain amount of pressure is applied to the printing plate (a screen or other printing base with holes made to allow ink to pass through the holes in the plate) to transfer the ink to the substrate. During screen printing, a squeegee is used to squeeze the ink through the holes in the image area and transfer it to the substrate, creating an image that is identical to the original.

[0003] As described in the published patent "A New Silk Screen Printing Machine" with publication number CN212636879U, a silk screen printing machine is a machine that prints with a silk screen printing plate, which is a type of printing machine. A silk screen printing machine is a machine that prints text and images, and is a general term for machines or equipment used to produce printed products. A silk screen printing machine is a more representative printing device among stencil printing machines. An existing silk screen printing machine includes an ink-distributing knife, an ink-distributing cylinder, an ink scraper, an ink scraper cylinder, a workbench, a hydraulic rod and a plate rack. When printing, a user places printing paper on the workbench, and then moves the plate rack down by the hydraulic cylinder, so that the printing plate is close to the printing paper. The user then drives the ink-distributing knife down by the ink-distributing cylinder, drives the ink scraper down by the ink scraper cylinder, and then evenly distributes the printing ink on the printing plate by the ink-distributing knife, and then prints the printing ink on the printing paper by the ink scraper, and then takes out the printing paper. It was found in the use of the existing silk screen printing machine that when the printing paper is placed manually, it is easy to be clamped when the plate rack moves down, and the safety is poor.

[0004] When using a screen printing machine to print images and texts on the surface of a substrate, especially when the substrate is large in size, a large or relatively large pneumatic screen printing device is usually required to operate the control panel of the screen printing machine so that the rocker arm moves with the screen printing plate, printing scraper and ink return scraper to the workbench to complete the printing. When the staff places the substrate on the workbench, they have to put their hands under the screen printing plate. If someone makes a mistake in operation and the screen printing plate moves downward, if the staff's hands are not withdrawn from under the screen printing plate, there will be a great safety hazard.

[0005] To sum up, large or relatively large pneumatic screen printing equipment, when the scraper arm is printing, the heavy scraper arm mechanism is driven downward by the cylinder, which will generate a strong impact force. When the operator receives and places the substrate, improper operation may easily cause injury. In the existing pneumatic screen printing equipment, the scraper arm mechanism has the problem of excessive impact force during the downward pressure process, which poses a safety hazard. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0007] To achieve the above object, the present invention provides the following technical solutions: A device for reducing the impact force of a pneumatic mechanism, comprising a cylinder, a main circuit solenoid valve, a branch circuit solenoid valve, a one-way valve and a sealed container; The cylinder is interconnected with the main solenoid valve, which controls the switching and discharge of the air source on the extension side and the retraction side of the cylinder; The one-way valve is installed on one of the connecting pipes between the cylinder and the main solenoid valve, and the branch solenoid valve is connected to the pipe between the one-way valve and the cylinder; The sealed container is communicated with the branch solenoid valve.

[0008] As a further solution of the present invention: the cylinder is installed on the screen printing machine to drive the scraper arm mechanism to move; The main solenoid valve is connected to an upper air pipe and a lower air pipe, which are respectively connected to the upper air port and the lower air port of the cylinder. The main solenoid valve is used to control the switching and discharge of the two air sources of the upper air port and the lower air port of the cylinder. One end of the branch solenoid valve is connected to the sealed container, and the other end of the branch solenoid valve is connected to the lower air pipe. The lower air pipe includes a front air path close to the cylinder and a rear air path close to the main solenoid valve. The dividing point between the front air path and the rear air path is the connection point between the branch solenoid valve and the lower air pipe. The branch solenoid valve is used to control the exhaust and gas storage functions of the sealed container. The one-way valve is installed in the rear end gas path and is used to prevent gas from flowing back and exhausting when the main solenoid valve is energized to switch the air flow.

[0009] As a further solution of the present invention: the cylinder includes a double-acting cylinder, the cylinder main shaft is in an extended state by default, the normally closed end of the main solenoid valve is directly connected to the cylinder, and the normally open end of the main solenoid valve is connected to the air inlet end of the one-way valve, so that the cylinder main shaft is extended, and a three-way quick connector is provided at the connection point between the branch solenoid valve and the lower end air pipe, the air outlet end of the one-way valve is connected to the cylinder through one end of the three-way quick connector, and the other end of the three-way quick connector is connected to the normally closed end interface of the branch solenoid valve, and the air inlet end of the branch solenoid valve is connected to the sealed container to form a closed loop.

[0010] As a further solution of the present invention: the sealed container includes a single-interface sealed container.

[0011] As a further solution of the present invention: the sealed container includes a multi-interface sealed container.

[0012] As a further solution of the present invention: the sealed container includes a sealed container with adjustable volume.

[0013] As a further solution of the present invention: the diameter of the connecting pipeline between the main solenoid valve and the cylinder, and / or the connecting pipeline between the branch solenoid valve and the sealed container is set to be greater than or equal to the diameter of the cylinder gas port.

[0014] As a further solution of the present invention: the branch solenoid valve is a two-position three-way solenoid valve, and its default normally closed state together with the one-way valve constitutes a fault-safe circuit; when the system loses power or pressure, the circuit locks the gas in the cylinder exhaust side passage, forcing the cylinder piston to stop moving to achieve safety locking.

[0015] A system for reducing the impact force of a pneumatic mechanism, the system comprising a switch device, a buffer device and a pneumatic mechanism, the switch device being used to issue instructions to the buffer device, the buffer device comprising the above-mentioned device, the pneumatic mechanism and the buffer device being integrated into one, for reducing the force acting during the operation of the pneumatic mechanism.

[0016] A method for reducing the impact force of a pneumatic mechanism, the method using the above-mentioned device, the method being applied to the printing operation of the scraper arm of a rocker arm screen printing machine, the method comprising the following steps: S1, Squeegee arm downward printing control process: The control system sends a downward pressure command to the main solenoid valve and the branch solenoid valve at the same time; The main circuit solenoid valve responds to the command, its normally open end closes and its normally closed end opens, allowing the gas source to enter the upper chamber of the cylinder through the normally closed end gas path; The branch solenoid valve responds to the command synchronously, its normally open end closes and its normally closed end opens, so that the exhaust passage of the lower chamber of the cylinder is connected to the normally closed end of the branch solenoid valve; The gas discharged from the lower chamber of the cylinder cannot flow back to the main solenoid valve due to the blocking effect of the one-way valve, and instead flows into the sealed container through the normally closed end of the branch solenoid valve for storage; As the gas is continuously stored in the sealed container, the pressure in the lower chamber of the cylinder continues to decrease, while the intake pressure in the upper chamber of the cylinder continues to maintain, forming a pressure difference environment in which the pressure in the upper chamber is greater than that in the lower chamber. Under the action of pressure difference, the cylinder spindle performs a contraction action, driving the rocker arm screen printing machine scraper arm to press down steadily to complete printing; S2, scraper arm rising and resetting control process: After printing is completed, the control system sends a rising command to the main solenoid valve and the branch solenoid valve at the same time; The main circuit solenoid valve switches to a state where its normally closed end is closed and its normally open end is opened, allowing the gas source to enter the lower chamber of the cylinder through the normally open end gas path; The branch solenoid valve switches state synchronously, its normally closed end closes and its normally open end opens, so that the stored gas in the sealed container is discharged outward through the normally open end of the branch solenoid valve; The lower chamber of the cylinder is pushed by the continuous intake pressure, and at the same time the gas in the upper chamber is discharged through the main solenoid valve. The cylinder spindle extends and drives the scraper arm of the rocker arm to lift and reset.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention adds a branch solenoid valve, a one-way valve and a sealed container on the pipeline between the main solenoid valve and the cylinder. When the cylinder drives the scraper arm mechanism to press down, the branch solenoid valve opens and introduces part of the compressed air into the sealed container for storage, thereby effectively buffering the movement speed of the cylinder, significantly reducing the impact force, avoiding the risk of pinching caused by misjudgment of operation or failure to evacuate the hand in time, and improving the safety of large-scale pneumatic screen printing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural stereogram of the present invention; Figure 2 It is another structural stereogram of the present invention; Figure 3 This is a schematic diagram of the operation of the main solenoid valve and the branch solenoid valve in the present invention under normal conditions; Figure 4 This is a schematic diagram of the operation of the main solenoid valve and the branch solenoid valve in the present invention when they are energized; Figure 5 This is a structural perspective diagram of an embodiment of the present invention; Figure 6 is another structural perspective view of an embodiment of the present invention; The reference numerals and names in the figures are as follows: Cylinder 101, cylinder spindle 102, one-way valve 103, sealed container 104, main solenoid valve 105, branch solenoid valve 106, main solenoid valve normally open end 107, main solenoid valve normally open end exhaust port 108, main solenoid valve normally closed end 109, main solenoid valve normally closed end exhaust port 110, main solenoid valve air inlet 111, branch solenoid valve normally closed end 112, branch solenoid valve normally open end 113, branch solenoid valve air inlet 114, three-way quick connector 115, scraper arm mechanism 201, solenoid valve coil 301, upper air pipe 116, lower air pipe 117, upper air port 118, lower air port 119, front air path 120, rear air path 121. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-6 , a device for reducing the impact force of a pneumatic mechanism, comprising a cylinder 101, a main circuit solenoid valve 105, a branch circuit solenoid valve 106, a one-way valve 103 and a sealed container 104; The cylinder 101 is interconnected with the main solenoid valve 105, and the main solenoid valve 105 controls the switching and discharge of the air source on the extension side and the retraction side of the cylinder 101; The one-way valve 103 is installed on one of the connecting pipes between the cylinder 101 and the main solenoid valve 105, and the branch solenoid valve 106 is connected to the pipe between the one-way valve 103 and the cylinder 101; The sealed container 104 is in communication with the branch solenoid valve 106; By cleverly introducing a buffer branch controlled by a branch solenoid valve 106 into the main gas circuit, multiple significant effects are created; First, in terms of core safety performance, when the cylinder 101 drives the heavy scraper arm mechanism 201 downward, the system triggers the branch solenoid valve 106 to open, diverting some of the originally rapidly exhausted compressed air and storing it in the sealed container 104. This effectively slows the end movement speed of the cylinder 101, converting linear exhaust into a flexible buffer. This greatly reduces the risk of serious pinching or crushing injuries caused by equipment malfunction or the operator's failure to remove their hands in time, fundamentally improving the human-machine safety of large-scale pneumatic screen printing equipment. Secondly, in terms of equipment protection and service life, the device absorbs and dissipates impact forces, significantly reducing vibration and stress damage caused by impact to the cylinder 101 itself, the piston rod, seals, and the entire printing press mechanical structure (such as the rocker arm, bearings, and screen). This reduces equipment failure rates, extends the service life of core components, and reduces maintenance costs. At the same time, in terms of improving printing quality, the smooth and gentle downward pressing process avoids violent collisions between the screen and the substrate (or workbench), helping to prevent printing quality problems caused by this, ensuring the uniformity of ink color and pattern quality of the printed products. This solution is particularly suitable for high-quality printing needs. The solution has a simple structure and a high degree of integration. It is achieved only by adding standard pneumatic components such as the solenoid valve, the one-way valve 103 and the sealing container 104. There is no need to significantly modify the main structure of the existing equipment. It is low-cost and easy to implement and promote. The present invention adds a branch solenoid valve 106, a one-way valve 103 and a sealed container 104 to the pipeline between the main solenoid valve 105 and the cylinder 101. When the cylinder 101 drives the scraper arm mechanism 201 to press down, the branch solenoid valve 106 opens and introduces part of the compressed air into the sealed container 104 for storage, thereby effectively buffering the movement speed of the cylinder 101, significantly reducing the impact force, avoiding the risk of pinching caused by misjudgment of operation or failure to evacuate the hands in time, and improving the safety of large-scale pneumatic screen printing equipment.

[0021] In the embodiment of the present invention, the cylinder 101 is installed on the screen printing machine to drive the scraper arm mechanism 201 to move; The main solenoid valve 105 is connected to an upper air pipe 116 and a lower air pipe 117, which are respectively connected to an upper air port 118 and a lower air port 119 of the cylinder 101. The main solenoid valve 105 is used to control the switching and discharge of the two air sources of the upper air port 118 and the lower air port 119 of the cylinder 101. One end of the branch solenoid valve 106 is connected to the sealed container 104, and the other end of the branch solenoid valve 106 is connected to the lower end air pipe 117. The lower end air pipe 117 includes a front end air path 120 close to the cylinder 101 and a rear end air path 121 close to the main solenoid valve 105. The dividing point between the front end air path 120 and the rear end air path 121 is the connection point between the branch solenoid valve 106 and the lower end air pipe 117. The branch solenoid valve 106 is used to control the exhaust and gas storage functions of the sealed container 104. The one-way valve 103 is installed in the rear end gas path 121 to prevent gas from flowing back and exhausting when the main solenoid valve 105 is energized to switch the gas flow; Through highly coordinated component layout and precise control logic, it provides high-performance safety buffer protection for large screen printing machines; The technical solution of the present invention connects the buffer branch (branch solenoid valve 106 and sealed container 104) in parallel with the key air path that drives the scraper arm to press down, that is, the "lower end air pipe 117" connected to the lower chamber of the cylinder 101, which enables the buffer system to act directly and efficiently on the source of the downward impact force; its core working mechanism is that when the scraper arm needs to move downward, the main solenoid valve 105 and the branch solenoid valve 106 are triggered at the same time, and the exhaust gas in the lower chamber of the cylinder 101 cannot be quickly discharged through the main solenoid valve 105 due to the obstruction of the one-way valve 103, and is instead forced to be introduced into the sealed container 104 for storage. On the one hand, this significantly reduces the back pressure and exhaust speed of the lower chamber of the cylinder 101 by absorbing high-pressure gas through the sealed container 104. On the other hand, by maintaining the air intake pressure of the upper chamber, a pressure difference buffer environment of "upper chamber pressure>lower chamber pressure" is created, thereby converting the rigid and high-speed downward movement of the heavy scraper arm mechanism 201 into a controllable and gentle one. The low-speed descent greatly improves safety and completely avoids serious crushing accidents that may be caused by equipment malfunction or the operator's hands not leaving the work area in time. In addition, in terms of equipment protection and performance, the active unloading mechanism greatly absorbs the kinetic energy of the moving parts and effectively suppresses mechanical vibration and impact. It not only protects the cylinder 101, the piston rod and its seals, but also extends the service life of the entire mechanical system such as the scraper arm mechanism 201, bearings, and screen printing plates, reducing maintenance costs. At the same time, the smooth downward action avoids the violent collision between the screen and the substrate, and improves the stability of printing quality. Finally, the design is both sophisticated and practical. All components are based on mature pneumatic standard parts. By optimizing the air path connection (such as placing the one-way valve 103 in the rear-end air path 121 and the branch solenoid valve 106 with a single interface to connect to the storage tank), it is seamlessly integrated into the existing equipment with minimal changes and low cost, achieving a high-performance safety upgrade.

[0022] In the embodiment of the present invention, the cylinder 101 includes a double-acting cylinder 101, the cylinder main shaft 102 is in an extended state by default, the normally closed end 109 of the main solenoid valve is directly connected to the cylinder 101, and the normally open end 107 of the main solenoid valve is connected to the air inlet end of the one-way valve 103, so that the cylinder main shaft 102 is extended, and a three-way quick connector 115 is provided at the connection point between the branch solenoid valve 106 and the lower end air pipe 117, and the air outlet end of the one-way valve 103 is connected to the cylinder 101 through one end of the three-way quick connector 115, and the other end of the three-way quick connector 115 is connected to the interface of the normally closed end 112 of the branch solenoid valve, and the air inlet end of the branch solenoid valve is connected to the sealed container 104 to form a closed loop; The use of double-acting cylinder 101 and optimized gas connection design further enhance the device's buffering performance and reliability; The normally open end 107 of the main solenoid valve is connected to the air circuit through the one-way valve 103, and the air outlet end of the one-way valve 103, the air pipe 117 at the lower end of the cylinder 101 and the normally closed end of the branch solenoid valve are intelligently interconnected using a three-way quick connector 115 to form a high-efficiency closed-loop buffer circuit. When the branch solenoid valve 106 and the main solenoid valve 105 are triggered at the same time, the exhaust gas from the lower chamber of the cylinder 101 is quickly introduced into the sealed container 104 through the three-way joint under the guidance of the one-way valve 103, rather than being discharged directly into the atmosphere. This greatly reduces the exhaust back pressure, significantly slows down the downward speed of the scraper arm through the pressure difference effect, converts the rigid impact into a flexible buffer, and completely avoids the risk of crushing injury; at the same time, the closed-loop design reduces pressure loss and improves the response speed. It not only effectively protects the mechanical structure and printing plate and improves printing quality, but also simplifies installation and maintenance by using standard parts and quick connectors, and realizes high-performance and high-reliability safety buffering.

[0023] In the embodiment of the present invention, the sealed container 104 includes a single-port sealed container 104; By adopting the single-interface sealed container 104, the gas path structure and installation process of the entire buffer device are greatly simplified; The single-interface design directly connects to the air inlet end of the branch solenoid valve 106, eliminating complex multi-way connectors and additional piping, which not only reduces the manufacturing cost and procurement cost of the component itself, but also reduces potential leakage points, improves air tightness and system reliability; this simple connection method allows the sealed container 104 to be more flexibly arranged in the limited space of the equipment, significantly reducing the complexity and time cost of installation and maintenance, while ensuring the response efficiency of the gas storage and pressure release functions, thereby ensuring excellent buffering performance (smooth unloading, avoiding impact, and improving safety), and achieving the comprehensive beneficial effects of the entire device being compact in structure, economical and practical, and stable and reliable.

[0024] In the embodiment of the present invention, the sealed container 104 includes a multi-port sealed container 104; By adopting a multi-interface sealed container 104, the scalability and adaptability of the device's buffering capacity are significantly improved: the multi-interface design allows multiple tanks to be conveniently connected in series, so that the total volume of the sealed container 104 can be flexibly expanded according to the specifications of the cylinder 101, the weight of the scraper arm and the required buffering force in actual applications, thereby achieving effective absorption and smooth resolution of greater kinetic energy and stronger impact force; this scalability enables the same device to be widely adapted to large-scale silk screen equipment of different models and tonnages, enhancing versatility, and at the same time further improving equipment operation stability, printing quality consistency and operational safety by optimizing the buffering effect. Its modular series connection method also facilitates installation, adjustment and maintenance, providing a high degree of flexibility for equipment upgrades and renovations.

[0025] In the embodiment of the present invention, the sealed container 104 includes a sealed container 104 with adjustable volume; By adopting the volume-adjustable sealed container 104, precise and dynamic regulation of the buffering effect is achieved, thereby significantly improving the performance optimization capability and application scope of the device; The operator can flexibly adjust the volume of the sealed container 104 according to the specific printing process requirements, the actual weight of the scraper arm and the operating speed, so as to accurately control the capacity and final pressure of the gas introduced into the exhaust side of the cylinder 101, so that the buffering force can be accurately matched and offset the downward impulse energy, ensuring that the scraper arm mechanism 201 can always descend at a safer and smoother speed, and completely eliminating safety hazards; this fine adjustment capability not only enables a single device to perfectly adapt to various specifications of screen printing equipment and production scenarios from light to heavy, greatly enhancing versatility, but also eliminates the tediousness of replacing tanks of different capacities, simplifies the debugging process, and further reduces the impact on the mechanical structure by optimizing the buffering process, extends the life of the equipment, and ensures the stability of printing quality, achieving a high degree of unity of safety, efficiency and cost-effectiveness.

[0026] In the embodiment of the present invention, the diameter of the connecting pipe between the main solenoid valve 105 and the cylinder 101, and / or the connecting pipe between the branch solenoid valve 106 and the sealed container 104 is set to be greater than or equal to the diameter of the gas port of the cylinder 101; By setting the diameter of the main and branch connecting pipes to be greater than or equal to the diameter of the air port of cylinder 101, the buffer response speed and overall performance of the device are significantly improved: increasing the diameter effectively reduces the resistance of the airflow in the pipeline, so that the high-pressure gas on the exhaust side of cylinder 101 can flow into the sealed container 104 more quickly, thereby greatly shortening the response time of the buffer system, ensuring that a smooth and effective buffering force can be provided immediately from the initial stage of the scraper arm's downward movement, avoiding the delay caused by pipeline throttling; this not only further enhances operational safety and completely eliminates the impact risk, but also ensures the uniformity of the downward speed during the printing process, thereby improving the stability and consistency of printing quality. At the same time, high-speed gas exchange also optimizes the equipment's action cycle efficiency. Its design does not change the core components but only optimizes the pipeline parameters, achieving low-cost and high-reliability performance improvement.

[0027] In the embodiment of the present invention, the branch solenoid valve 106 is a two-position three-way solenoid valve, which is in a normally closed state by default and together with the one-way valve 103 forms a fail-safe circuit; when the system loses power or pressure, the circuit locks the gas in the exhaust side passage of the cylinder 101, forcing the piston of the cylinder 101 to stop moving, thereby achieving safety locking; By adopting a two-position three-way solenoid valve and coordinating its default normally closed state with the one-way valve 103, a crucial fail-safe loop is constructed, thus providing a passive safety protection mechanism for the system. In the event of an emergency due to a sudden power outage or gas source failure, the branch solenoid valve 106 will automatically reset to the normally closed state, forming a reliable gas locking barrier together with the one-way valve 103, sealing the compressed air in the exhaust side passage of the cylinder 101 in the circuit, effectively preventing the continued movement of the piston of the cylinder 101, forcing the heavy scraper arm mechanism 201 to stop immediately and lock in the current position, avoiding the sudden fall or uncontrolled downward rush of the scraper arm due to loss of pressure, and completely eliminating the huge risk of injuring the operator or damaging the substrate and equipment caused by this; this mechanism automatically takes effect without the need for external power or control signals, greatly improving the inherent safety level of the equipment, providing another solid safety guarantee for the operator, and also helping to protect the precision mechanical structure from impact damage.

[0028] A system for reducing the impact force of a pneumatic mechanism, the system comprising a switch device, a buffer device, and a pneumatic mechanism, the switch device being used to issue instructions to the buffer device, the buffer device comprising the above-mentioned device, the pneumatic mechanism and the buffer device being integrated into one body, for reducing the force applied during the operation of the pneumatic mechanism; By integrating the switchgear, buffer device, and pneumatic mechanism into a unified system, coordinated control of the entire process from command issuance to power execution to impact force mitigation is achieved, creating an efficient, reliable, and easy-to-install safety solution. The system sends precise instructions to the buffer device through the switch device. The buffer device is integrated with the pneumatic mechanism, so that the impact force generated by the pneumatic mechanism during operation can be actively absorbed and resolved from the source. This not only greatly improves the inherent safety level of the equipment and completely eliminates the risk of operator injury, but also significantly reduces the damage to the mechanical structure caused by impact vibration and extends the service life of the equipment. At the same time, the integrated system design simplifies the installation and commissioning process, improves the response speed and control accuracy, and ensures stable and reliable safety performance. It is particularly suitable for industrial application scenarios with extremely high requirements for safety and reliability, such as large-scale pneumatic screen printing equipment. It is also suitable for pneumatic mechanisms with biting actions, and is used to reduce the biting force during the operation of the pneumatic mechanism, thereby ensuring safe production.

[0029] A method for reducing the impact force of a pneumatic mechanism, the method using the above-mentioned device, the method being applied to the printing operation of the scraper arm of a rocker arm screen printing machine, the method comprising the following steps: S1, Squeegee arm downward printing control process: The control system sends a pressure-down command to the main solenoid valve 105 and the branch solenoid valve 106 simultaneously; The main circuit solenoid valve 105 responds to the command, its normally open end closes and its normally closed end opens, allowing the gas source to enter the upper chamber of the cylinder 101 through the normally closed end gas path; The branch solenoid valve 106 responds to the instruction synchronously, its normally open end closes and its normally closed end opens, so that the exhaust passage of the lower chamber of the cylinder 101 is connected to the normally closed end of the branch solenoid valve 106; The gas discharged from the lower chamber of the cylinder 101 is blocked by the one-way valve 103 and cannot flow back to the main solenoid valve 105. Instead, it flows into the sealed container 104 through the normally closed end of the branch solenoid valve 106 for storage. As the gas is continuously stored in the sealed container 104, the pressure in the lower chamber of the cylinder 101 continues to decrease, while the intake pressure in the upper chamber of the cylinder 101 continues to be maintained, forming a pressure difference environment in which the pressure in the upper chamber is greater than the pressure in the lower chamber; Under the action of pressure difference, the cylinder main shaft 102 performs a contraction action, driving the rocker arm screen printing machine scraper arm to press down steadily to complete printing; S2, scraper arm rising and resetting control process: After printing is completed, the control system sends a rising instruction to the main solenoid valve 105 and the branch solenoid valve 106 at the same time; The main circuit solenoid valve 105 switches state, with its normally closed end closed and its normally open end opened, allowing the gas source to enter the lower chamber of the cylinder 101 through the normally open end gas path; The branch solenoid valve 106 switches state synchronously, with its normally closed end closed and its normally open end opened, so that the stored gas in the sealed container 104 is discharged outward through the normally open end 113 of the branch solenoid valve; The lower chamber of the cylinder 101 is continuously pushed by the intake pressure, while the gas in the upper chamber is discharged through the main solenoid valve 105, and the cylinder main shaft 102 performs the extension action, driving the rocker arm screen printing machine scraper arm to lift and reset; By defining a set of precise and coordinated dual-solenoid valve synchronous control methods, the hardware performance of the device is transformed into a repeatable, reliable and safe operating process, achieving seamless integration and intelligent management of the buffering process and printing action; By synchronously triggering the switching of the main and branch solenoid valves 106, the exhaust gas from the lower chamber of the cylinder 101 is directed into the sealed container 104 during the downward pressure stage of the scraper arm, actively building a controllable pressure difference environment, thereby converting the traditional rigid impact into a fully controlled flexible deceleration motion, which not only completely eliminates the risk of crushing injuries, but also significantly reduces equipment vibration and impact damage, extends the mechanical life and improves printing quality; in the reset stage, the same synchronous control logic ensures rapid emptying of the stored air and efficient reset of the cylinder 101, taking into account production efficiency; the entire method converts the safety characteristics of the device into standardized and automated process steps, which are reliable and consistent in operation, do not rely on personnel experience, and are particularly suitable for modern printing production environments that require high-frequency and high-safety operations.

[0030] In one embodiment, the sealed container 104 includes a gas tank.

[0031] In one embodiment, when the cylinder spindle 102 is in the retracted state by default, the upper air pipe 116 and the lower air pipe 117 are reversely connected to the upper air port 118 and the lower air port 119 of the cylinder 101; By reversing the connection of the upper air pipe 116, the lower air pipe 117 and the corresponding air ports of the cylinder, the adaptability and versatility of the buffer device are significantly enhanced: when the cylinder main shaft is in the retracted state by default, this reversal scheme allows the entire buffer system to adapt to the new installation configuration without changing the connection logic and control program of its core components, that is, to buffer the process of extending the cylinder main shaft 102; ensuring that the excellent buffering performance of the present invention can be fully exerted in different equipment or different cylinder installation methods. This flexible adaptability greatly expands the application range of the device and realizes a plug-and-play universal safety solution.

[0032] In one embodiment, the device of the present invention is applicable to a pneumatic vertical lift screen printing machine; The applicable scenario of the device is concretized as a pneumatic vertical lifting screen printing machine. The device can be integrated into this type of equipment, directly targeting the inherent risk of strong impact force generated by its vertical lifting mechanism under its huge dead weight. Through real-time buffering and unloading, it effectively prevents crushing accidents caused by accidental downward rush of the lifting platform, greatly improving the safety of equipment use; at the same time, its smooth deceleration effect protects the precise lifting guide rails, lead screws and transmission mechanisms, reduces maintenance requirements and extends equipment life, and can also avoid the influence of lifting vibration on printing accuracy, ensuring printing stability, providing a ready-to-use, efficient and reliable safety solution for this type of widely used special equipment.

[0033] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for reducing the impact force of a pneumatic mechanism, characterized in that: It comprises a cylinder (101), a main electromagnetic valve (105), a branch electromagnetic valve (106), a one-way valve (103) and a sealed container (104); The cylinder (101) is in communication with the main electromagnetic valve (105), and the main electromagnetic valve (105) controls the switching and discharge of the air source on the extension side and the contraction side of the cylinder (101); The one-way valve (103) is installed on one of the connecting pipelines between the cylinder (101) and the main electromagnetic valve (105), and the branch electromagnetic valve (106) is connected to the pipeline between the one-way valve (103) and the cylinder (101); The sealed container (104) is in communication with a branch solenoid valve (106).

2. The device for reducing the impact force of a pneumatic mechanism according to claim 1, characterized in that: The cylinder (101) is installed on the screen printing machine and is used to drive the scraper arm mechanism (201) to move; The main electromagnetic valve (105) is connected to an upper air pipe (116) and a lower air pipe (117), and the upper air pipe (116) and the lower air pipe (117) are respectively connected to the upper air port (118) and the lower air port (119) of the cylinder (101). The main electromagnetic valve (105) is used to control the switching and discharge of the two air sources of the upper air port (118) and the lower air port (119) of the cylinder (101). One end of the branch solenoid valve (106) is connected to the sealed container (104), and the other end of the branch solenoid valve (106) is connected to the lower air pipe (117). The lower air pipe (117) includes a front air path (120) close to the cylinder (101) and a rear air path (121) close to the main solenoid valve (105). The boundary point between the front air path (120) and the rear air path (121) is the connection point between the branch solenoid valve (106) and the lower air pipe (117). The branch solenoid valve (106) is used to control the exhaust and gas storage functions of the sealed container (104). The one-way valve (103) is installed in the rear end gas path (121) and is used to prevent gas from flowing back and exhausting when the main path solenoid valve (105) is energized to switch the gas flow.

3. The device for reducing the impact force of a pneumatic mechanism according to claim 2, characterized in that: The cylinder (101) includes a double-acting cylinder (101), the cylinder main shaft (102) is in an extended state by default, the main electromagnetic valve normally closed end (109) is directly connected to the cylinder (101), the main electromagnetic valve normally open end (107) is connected to the inlet end of the one-way valve (103), so that the cylinder main shaft (102) is extended, and a three-way quick connector (115) is provided at the connection point between the branch electromagnetic valve (106) and the lower end air pipe (117), the outlet end of the one-way valve (103) is connected to the cylinder (101) through one end of the three-way quick connector (115), and the other end of the three-way quick connector (115) is connected to the interface of the normally closed end (112) of the branch electromagnetic valve, and the inlet end of the branch electromagnetic valve is connected to the sealed container (104) to form a closed loop.

4. A device for reducing the impact force of a pneumatic mechanism according to any one of claims 1 to 3, characterized in that: The sealed container (104) comprises a single-interface sealed container (104).

5. A device for reducing the impact force of a pneumatic mechanism according to any one of claims 1 to 3, characterized in that: The sealed container (104) comprises a multi-interface sealed container (104).

6. A device for reducing the impact force of a pneumatic mechanism according to any one of claims 1 to 3, characterized in that: The sealed container (104) comprises a sealed container (104) with adjustable volume.

7. A device for reducing the impact force of a pneumatic mechanism according to any one of claims 1 to 3, characterized in that: The diameter of the connecting pipeline between the main electromagnetic valve (105) and the cylinder (101), and / or the connecting pipeline between the branch electromagnetic valve (106) and the sealed container (104) is set to be greater than or equal to the diameter of the air port of the cylinder (101).

8. A device for reducing the impact force of a pneumatic mechanism according to any one of claims 1 to 3, characterized in that: The branch solenoid valve (106) is a two-position three-way solenoid valve, and its default normally closed state forms a fail-safe circuit together with the one-way valve (103); when the system loses power or pressure, the circuit locks the gas in the exhaust side passage of the cylinder (101), forcing the piston of the cylinder (101) to stop moving, thereby achieving safety locking.

9. A system for mitigating the impact force of a pneumatic mechanism, the system comprising a switch device, a buffer device, and a pneumatic mechanism, wherein the switch device is used to issue instructions to the buffer device, and is characterized in that: The buffer device includes the device according to any one of claims 1 to 8, and the pneumatic mechanism and the buffer device are integrated into one body to reduce the force during the operation of the pneumatic mechanism.

10. A method for reducing the impact force of a pneumatic mechanism, characterized in that: The method adopts the device according to any one of claims 1 to 8, and the method is applied to the scraper arm printing operation of a rocker arm screen printing machine, and the method comprises the following steps: S1, Squeegee arm downward printing control process: The control system simultaneously issues a downward pressure command to the main solenoid valve (105) and the branch solenoid valve (106); The main circuit solenoid valve (105) responds to the command, its normally open end closes and its normally closed end opens, allowing the gas source to enter the upper chamber of the cylinder (101) through the normally closed end gas path; The branch solenoid valve (106) responds to the instruction synchronously, its normally open end is closed, and its normally closed end is opened, so that the exhaust passage of the lower chamber of the cylinder (101) is connected to the normally closed end of the branch solenoid valve (106); The gas discharged from the lower chamber of the cylinder (101) cannot flow back to the main solenoid valve (105) due to the blocking effect of the one-way valve (103), and instead flows into the sealed container (104) through the normally closed end of the branch solenoid valve (106) for storage; As the gas is continuously stored in the sealed container (104), the air pressure in the lower chamber of the cylinder (101) continues to decrease, while the air intake pressure in the upper chamber of the cylinder (101) continues to be maintained, forming a pressure difference environment in which the air pressure in the upper chamber is greater than the air pressure in the lower chamber; Under the action of the pressure difference, the cylinder main shaft (102) performs a contraction action, driving the scraper arm of the rocker screen printing machine to press down steadily to complete printing; S2, scraper arm rising and resetting control process: After printing is completed, the control system sends a rising instruction to the main solenoid valve (105) and the branch solenoid valve (106) at the same time; The main circuit solenoid valve (105) switches to a state where its normally closed end is closed and its normally open end is opened, allowing the gas source to enter the lower chamber of the cylinder (101) through the normally open end gas path; The branch solenoid valve (106) switches state synchronously, with its normally closed end closed and its normally open end opened, so that the stored gas in the sealed container (104) is discharged to the outside through the normally open end (113) of the branch solenoid valve; The lower chamber of the cylinder (101) is continuously pushed by the intake pressure, while the gas in the upper chamber is discharged through the main electromagnetic valve (105), and the cylinder main shaft (102) performs the extension action, driving the rocker arm screen printing machine scraper arm to rise and reset.

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