Pneumatic control circuit and its pulp molding production line

Abstract

The utility model provides a kind of pneumatic control loop and its paper pulp moulding production line, pneumatic control loop includes: multiple balance pipelines, multiple balance pipelines are set up one by one with multiple pneumatic equipment, each balance pipeline all includes the big gas holder and balance cylinder of being connected, balance cylinder is used to be driven to connect with the load of corresponding pneumatic equipment, to provide driving force to load;Gas source pipeline, gas source pipeline is connected with multiple balance pipelines, to supply gas to multiple balance pipelines;Intermediate pipeline, intermediate pipeline is arranged between multiple balance pipelines and gas source pipeline, any two adjacent balance pipelines are connected by intermediate pipeline, gas source pipeline is connected with any one balance pipeline by intermediate pipeline, to solve the problem of higher production cost in prior art paper pulp moulding production line due to each equipment uses independent balance pneumatic circuit.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic balancing technology, and more specifically, to a pneumatic control circuit and its pulp molding production line. Background Technology

[0002] In existing technologies, pulp molding servo crank-toggle type shaping and cutting equipment uses a single air pressure balancing system to handle gravity loads. This system is based on cylinders drawing air from an air tank and returning exhaust air to the air tank. When the air pressure exceeds a set value, the air tank releases excess gas through an overflow valve. However, for long crank equipment, the resistance torque caused by gravity loads is significant, making it difficult to effectively control using only a servo motor. Higher-power motors and drivers are required, which may exceed the actual power range of the motor in some cases, limiting the feasibility of high-speed operation. Simultaneously, while the solenoid valve switching circuit can assist in power supply, its slow response speed becomes a bottleneck to production efficiency for high-speed equipment.

[0003] The pulp molding production line consists of a molding machine, a setting machine, a cutting machine, and a handling robot. The cutting machine is usually used in conjunction with two setting machines. In this environment, the gravity load pressure of each piece of equipment is similar, but each piece of equipment has an independent balancing pneumatic circuit, which leads to redundant resource allocation and high costs. Utility Model Content

[0004] The main objective of this invention is to provide a pneumatic control circuit and its pulp molding production line to solve the problem of high production costs in existing pulp molding production lines where each piece of equipment uses an independent balancing pneumatic circuit.

[0005] To achieve the above objectives, according to one aspect of the present invention, a pneumatic control circuit is provided, comprising: multiple balancing pipelines, each balancing pipeline being configured one-to-one with multiple pneumatic devices, each balancing pipeline including a connected large air tank and a balancing cylinder, the balancing cylinder being used to drive the load of the corresponding pneumatic device to provide driving force to the load; an air source pipeline, the air source pipeline being connected to all multiple balancing pipelines to supply air to the multiple balancing pipelines; and an intermediate pipeline, the intermediate pipeline being disposed between the multiple balancing pipelines and the air source pipeline, any two adjacent balancing pipelines being connected through the intermediate pipeline, and the air source pipeline being connected to any one of the balancing pipelines through the intermediate pipeline.

[0006] Furthermore, the balancing pipeline includes an air supply branch, with its two ends connected to the large air tank and the balancing cylinder, respectively. The air supply branch also includes: a small air tank, which is located on the air supply branch and at the end of the large air tank closer to the load. The small air tank is connected in series with the large air tank to provide high-pressure gas to the balancing cylinder; and a pneumatic control valve, which is located on the air supply branch and between the small air tank and the large air tank to control whether the large air tank supplies gas to the balancing cylinder.

[0007] Furthermore, the balancing pipeline also includes: a muffler, which is located at the exhaust port of the balancing cylinder; and / or, a first control ball valve, a pressure reducing valve, an oil mist lubricator, and a first check valve, which are sequentially arranged along the direction close to the balancing cylinder on the air supply branch, wherein the first control ball valve, the pressure reducing valve, the oil mist lubricator, and the first check valve are all located between the pneumatic control valve and the small air tank.

[0008] Furthermore, the pneumatic control circuit also includes multiple control lines, which are set up one-to-one with multiple balance lines. Both ends of each control line are connected to the pneumatic control valve in the air source line and the corresponding balance line, respectively. Each control line is equipped with a solenoid valve to control the opening and closing of the pneumatic control valve.

[0009] Furthermore, the balancing pipeline also includes a return gas branch and a second check valve installed on the return gas branch. The two ends of the return gas branch are connected to the supply gas branch respectively. The first end of the return gas branch is located between the first check valve and the small gas storage tank, and the second end of the return gas branch is located between the pneumatic control valve and the first control ball valve.

[0010] Furthermore, the balancing pipeline also includes: a pressure gauge connected to the large gas tank to monitor the gas pressure inside the large gas tank; and a safety valve connected to one side of the large gas tank to control whether the large gas tank releases pressure to the outside.

[0011] Furthermore, the gas source pipeline is equipped with a filter, a main pressure reducing valve, and a third check valve, which are arranged sequentially along the direction close to the balance pipeline. The filter is used to filter the gas in the large gas storage tank delivered to the balance pipeline, and the main pressure reducing valve is used to regulate the pressure of the gas in the large gas storage tank delivered to the balance pipeline.

[0012] Furthermore, the intermediate pipeline includes a first pipe section and a second pipe section and multiple third pipe sections spaced apart on the first pipe section. The end of the second pipe section furthest from the first pipe section is connected to the gas source pipeline. The multiple third pipe sections are set one-to-one with multiple balancing pipelines. The end of each third pipe section furthest from the first pipe section is connected to the large gas storage tank of the corresponding balancing pipeline.

[0013] Furthermore, a second control ball valve is provided on at least one of the plurality of third pipe sections to control the on / off state of the corresponding third pipe section; and / or a third control ball valve is provided on the first pipe section to control the on / off state of the first pipe section.

[0014] According to another aspect of the present invention, a pulp molding production line is provided, comprising multiple pneumatic devices, including a first molding machine, a second molding machine and a cutting machine. The pulp molding production line includes a pneumatic control circuit, which is the aforementioned pneumatic control circuit. Multiple balancing pipelines of the pneumatic control circuit are arranged in a one-to-one correspondence with the first molding machine, the second molding machine and the cutting machine.

[0015] By applying the technical solution of this utility model, multiple balancing pipelines, air source pipelines, and intermediate pipelines are provided. Each balancing pipeline includes a large air storage tank and a balancing cylinder connected to each other. The intermediate pipeline is located between the multiple balancing pipelines and the air source pipelines. Any two adjacent balancing pipelines are connected through the intermediate pipeline, allowing direct connection between the large air storage tank and the balancing cylinder. This improves energy efficiency. Furthermore, the large air storage tank, as the gas storage and regulation center, can quickly respond to the gas demand of the balancing cylinder, ensuring stable power of the pneumatic equipment under load changes. The presence of the intermediate pipeline allows for rapid gas exchange and balancing between any two adjacent balancing pipelines. In a production line or equipment group, different pneumatic devices... The equipment may reach peak load or require gas replenishment at different times. The intermediate pipeline can quickly transfer gas from the storage tank at a higher pressure to the balance pipeline at a lower pressure, thereby achieving dynamic pressure balance and ensuring that all pneumatic equipment can operate in optimal condition. Therefore, the pneumatic control circuit in this application reduces the need for switching components such as solenoid valves, reduces system heat generation and energy consumption, and also reduces the investment and operating costs of related equipment. It can achieve effective load balancing of pneumatic equipment at a lower cost, and is particularly suitable for scenarios that require high-speed operation and frequent load changes. It solves the problem of high production costs in existing pulp molding production lines due to the use of independent balancing pneumatic circuits for each piece of equipment. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of an embodiment of the pneumatic control circuit according to the present invention and its pneumatic control circuit in a pulp molding production line is shown.

[0018] The above figures include the following reference numerals:

[0019] 10. Balancing pipeline; 110. Large air tank; 120. Balancing cylinder; 130. Air supply branch line; 140. Silencer;

[0020] 131. Small air storage tank; 132. Pneumatic control valve; 133. First control ball valve; 134. Pressure reducing valve; 135. Oil mist lubricator; 136. First check valve;

[0021] 150. Return gas branch; 151. Second check valve;

[0022] 160. Pressure gauge; 170. Safety valve;

[0023] 20. Pneumatic equipment; 210. Load;

[0024] 30. Gas supply pipeline; 310. Filter; 320. Main pressure reducing valve; 330. Third check valve;

[0025] 40. Intermediate pipeline; 410. First pipeline section; 420. Second pipeline section; 430. Third pipeline section;

[0026] 50. Control piping; 510. Solenoid valve;

[0027] 1. Second control ball valve; 2. Third control ball valve. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] like Figure 1 As shown, the pneumatic control circuit of this application includes: multiple balancing pipelines 10, each balancing pipeline 10 being configured one-to-one with multiple pneumatic devices 20, each balancing pipeline 10 including a large air tank 110 and a balancing cylinder 120 connected to it, the balancing cylinder 120 being used to drive the load 210 of the corresponding pneumatic device 20 to provide driving force to the load 210; an air source pipeline 30, which is connected to the multiple balancing pipelines 10 to supply air to the multiple balancing pipelines 10; and an intermediate pipeline 40, which is disposed between the multiple balancing pipelines 10 and the air source pipeline 30, any two adjacent balancing pipelines 10 being connected through the intermediate pipeline 40, and the air source pipeline 30 being connected to any one of the balancing pipelines 10 through the intermediate pipeline 40.

[0030] Thus, this utility model, by setting up multiple balancing pipelines 10, gas source pipelines 30, and intermediate pipelines 40, wherein each balancing pipeline 10 includes a large gas storage tank 110 and a balancing cylinder 120 connected to each other, and the intermediate pipeline 40 is set between the multiple balancing pipelines 10 and the gas source pipelines 30, any two adjacent balancing pipelines 10 are connected through the intermediate pipeline 40, so that the large gas storage tank 110 and the balancing cylinder 120 are directly connected, improving energy efficiency. Furthermore, the large gas storage tank 110, as the gas storage and regulation center, can quickly respond to the gas demand of the balancing cylinder 120, ensuring stable power of the pneumatic equipment under load changes; the existence of the intermediate pipeline 40 allows for rapid gas exchange and balancing between any two adjacent balancing pipelines 10. In a production line or equipment group, different pneumatic devices may reach peak load or require gas replenishment at different times. The intermediate pipeline 40 can quickly transfer the gas in the storage tank under high pressure to the balance pipeline under lower pressure, thereby achieving dynamic air pressure balance and ensuring that all pneumatic devices can operate in the best condition. Therefore, the pneumatic control circuit in this application reduces the need for switching components such as solenoid valves, reduces system heat generation and energy consumption, and also reduces the investment and operating costs of related equipment. It can achieve effective load balancing of pneumatic devices at a lower cost, and is particularly suitable for scenarios that require high-speed operation and frequent load changes. It solves the problem of high production costs in the existing pulp molding production line due to the use of independent balancing pneumatic circuits for each piece of equipment.

[0031] Specifically, the balancing pipeline 10 includes an air supply branch 130, the two ends of which are connected to the large air storage tank 110 and the balancing cylinder 120, respectively. The air supply branch 130 also includes: a small air storage tank 131, which is located on the air supply branch 130 and at the end of the large air storage tank 110 closest to the load 210. The small air storage tank 131 is connected in series with the large air storage tank 110 to provide high-pressure gas to the balancing cylinder 120; and a pneumatic control valve 132, which is located on the air supply branch 130 and between the small air storage tank 131 and the large air storage tank 110 to control whether the large air storage tank 110 supplies gas to the balancing cylinder 120.

[0032] Optionally, the pneumatic control valve 132 is a normally closed pneumatically controlled two-position two-way valve.

[0033] This application adds a small air tank 131 to the air supply branch 130, which is located close to the load 210. It can quickly respond to changes in the air pressure demand of the balancing cylinder. Especially in the case of a sudden increase in load or the need for rapid action, the high-pressure gas in the small air tank 131 can be replenished immediately, avoiding the delay caused by remotely transporting gas from the large air tank 110, and significantly enhancing the system's response speed and flexibility.

[0034] With the intervention of the pneumatic control valve 132, the timing and amount of air supplied from the large air tank 110 to the balancing cylinder 120 can be precisely controlled. During the cylinder's operation, the pneumatic control valve 132 can open or close as needed to achieve dynamic adjustment of the air pressure, ensuring that the cylinder can obtain the most suitable driving force under different working conditions, thereby improving the stability and accuracy of the equipment operation.

[0035] Specifically, the balancing pipeline 10 further includes: a muffler 140, which is disposed at the exhaust port of the balancing cylinder 120; and / or, a first control ball valve 133, a pressure reducing valve 134, an oil mist lubricator 135 and a first check valve 136 are sequentially disposed on the air supply branch 130 along the direction close to the balancing cylinder 120, wherein the first control ball valve 133, the pressure reducing valve 134, the oil mist lubricator 135 and the first check valve 136 are all located between the pneumatic control valve 132 and the small air storage tank 131.

[0036] A silencer 140 is installed at the exhaust port of the balance cylinder 120, which can effectively reduce the exhaust noise during equipment operation. This is of great significance for improving the comfort of the working environment and reducing industrial noise pollution. In industrial scenarios such as pulp molding production lines that operate continuously, mechanical noise will be generated continuously. The use of silencer 140 helps to create a quieter and healthier working environment.

[0037] On the gas supply branch 130 of this application, a first control ball valve 133, a pressure reducing valve 134, an oil mist lubricator 135, and a first check valve 136 are arranged sequentially near the balance cylinder 120. The combined use of this series of components enables fine regulation and pretreatment of the gas entering the balance cylinder 120. The pressure reducing valve 134 can adjust the gas pressure according to the actual needs of the equipment to ensure that the cylinder can obtain the appropriate driving pressure under different working conditions, thereby improving the smoothness and accuracy of the movement. The oil mist lubricator 135 can mix in lubricating oil mist to lubricate the pneumatic components, reduce wear, extend the service life of the equipment, and also improve the gas quality and reduce corrosion of precision components such as the cylinder.

[0038] Optionally, the pneumatic control circuit also includes multiple control lines 50, which are arranged one-to-one with multiple balance lines 10. Both ends of each control line 50 are connected to the pneumatic control valve 132 in the air source line 30 and the corresponding balance line 10, respectively. Each control line 50 is equipped with a solenoid valve 510 to control the opening and closing of the pneumatic control valve 132.

[0039] Optionally, the solenoid valve 510 is a normally closed two-position three-way valve.

[0040] By introducing multiple control lines 50 and combining them with solenoid valves 510, the pneumatic control loop achieves precise and remote control of the pneumatic control valves 132 in each balance line 10. As an electro-pneumatic component, the solenoid valve 510 can respond quickly when it receives an electrical signal from the control system, controlling the opening and closing of the pneumatic control valves 132, which greatly improves the accuracy and response speed of pneumatic control, and also provides strong support for the automation upgrade of the production line.

[0041] like Figure 1 As shown, the balance pipeline 10 also includes a return gas branch 150 and a second one-way valve 151 disposed on the return gas branch 150. The two ends of the return gas branch 150 are respectively connected to the supply gas branch 130. The first end of the return gas branch 150 is located between the first one-way valve 136 and the small gas storage tank 131, and the second end of the return gas branch 150 is located between the pneumatic control valve 132 and the first control ball valve 133.

[0042] The combination of the added return gas branch 150 and the second one-way valve 151 in this utility model allows the balance cylinder 120 to return the gas to the upstream area of ​​the supply gas branch 130 or the large gas storage tank 110 through the return gas branch 150 during the exhaust process, instead of directly discharging it into the environment. This not only recovers and utilizes a portion of the pressurized gas, reducing energy waste, but also reduces the system's demand for fresh gas, thereby reducing overall energy consumption and improving energy efficiency.

[0043] Optionally, the balancing pipeline 10 also includes: a pressure gauge 160 connected to the large gas tank 110 to monitor the gas pressure in the large gas tank 110; and a safety valve 170 connected to one side of the large gas tank 110 to control whether the large gas tank 110 releases pressure to the outside.

[0044] The addition of pressure gauge 160 enables the system to monitor the gas pressure in the large gas storage tank 110 in real time, which is crucial for preventing overpressure: the operator can observe the reading of pressure gauge 160 to understand the system pressure in a timely manner. The gas pressure in the large gas storage tank 110 is within the safe operating range, avoiding potential safety risks. In highly automated systems, the data from the pressure gauge can also be integrated into the control system to achieve automatic monitoring and early warning of gas pressure.

[0045] Safety valve 170 is connected to large gas tank 110. When the gas pressure in large gas tank 110 exceeds a predetermined safety threshold, safety valve 170 will automatically open to release excess gas to the outside, thereby preventing large gas tank 110 from overpressure explosion and effectively improving the safety level of the entire pneumatic control circuit.

[0046] like Figure 1As shown, the gas source pipeline 30 is equipped with a filter 310, a main pressure reducing valve 320, and a third check valve 330. The filter 310, the main pressure reducing valve 320, and the third check valve 330 are arranged sequentially along the direction close to the balance pipeline 10. The filter 310 is used to filter the gas in the large gas storage tank 110 delivered to the balance pipeline 10, and the main pressure reducing valve 320 is used to regulate the pressure of the gas in the large gas storage tank 110 delivered to the balance pipeline 10.

[0047] Preferably, the pre-positioning of the filter 310 can effectively filter out impurities, water vapor and oil mist in the air source, ensuring that the gas transmitted to the balance pipeline 10 is clean, reducing wear and failure of pneumatic components such as cylinders and valves caused by gas contamination, extending the service life of the equipment, and also improving the operational stability and reliability of the entire pneumatic control circuit.

[0048] Preferably, the addition of the main pressure reducing valve 320 enables the system to adjust the gas pressure in the large gas storage tank 110 to a suitable level according to the actual needs of the balance pipeline 10, avoiding unnecessary energy waste caused by high gas pressure and damage to pneumatic equipment caused by excessive gas pressure. By precisely adjusting the gas pressure, the system can achieve the required operating performance with lower energy consumption, thus realizing energy saving and consumption reduction.

[0049] Preferably, the third one-way valve 330 ensures unidirectional gas flow and prevents backflow. This not only protects the upstream filter 310 and main pressure reducing valve 320 from damage, but also ensures smooth airflow and avoids the impact of air pressure fluctuations on the pneumatic control response speed. In working scenarios where pneumatic equipment requires rapid response, this design can ensure that components such as cylinders quickly obtain the required gas pressure, thereby improving production efficiency.

[0050] like Figure 1 As shown, the intermediate pipeline 40 includes a first pipeline section 410 and a second pipeline section 420 and a plurality of third pipeline sections 430 spaced apart on the first pipeline section 410. The end of the second pipeline section 420 away from the first pipeline section 410 is connected to the gas source pipeline 30. The plurality of third pipeline sections 430 are arranged one-to-one with the plurality of balance pipelines 10. The end of each third pipeline section 430 away from the first pipeline section 410 is connected to the large gas storage tank 110 of the corresponding balance pipeline 10.

[0051] The arrangement of the first pipe section 410, the second pipe section 420, and multiple third pipe sections 430 in the intermediate pipeline 40, especially the connection between the second pipe section 420 and the air source pipeline 30, and the corresponding connection between the third pipe section 430 and the large air storage tanks 110 in the multiple balancing pipelines 10, is intended to balance the air pressure distribution in the pneumatic system. This layout ensures that all large air storage tanks 110 can receive a consistent air source pressure, reducing the problem of equipment incoordination caused by air pressure differences, and improving the operating efficiency and consistency of the entire production line.

[0052] Preferably, a second control ball valve 1 is provided on at least one of the plurality of third pipe sections 430 to control the opening and closing of the corresponding third pipe section 430; and / or a third control ball valve 2 is provided on the first pipe section 410 to control the opening and closing of the first pipe section 410.

[0053] By installing a second control ball valve 1 on the third pipe section 430, the operator or control system can independently control the airflow between each balance pipe 10 and the large air tank 110. This not only improves the flexibility of the pneumatic control circuit, but also makes the air supply control of each pneumatic device more precise. When it is necessary to isolate or repair a certain device, only the second control ball valve 1 related to it can be closed without affecting the normal operation of other devices, thus improving the controllability and maintenance convenience of the system.

[0054] The third control ball valve 2 provides an emergency shut-off mechanism for the entire intermediate pipeline 40. In the event of a gas leak, abnormal pressure, or other emergency, quickly closing the third control ball valve 2 can cut off the gas supply, prevent further escalation of the accident, and protect the safety of equipment and operators. Simultaneously, this design enhances system reliability, ensuring that even in the event of critical component failure, the system can continue to supply gas through other pathways, maintaining the basic operation of the production line.

[0055] This utility model also provides a pulp molding production line, including multiple pneumatic devices, including a first molding machine, a second molding machine and a cutting machine. The pulp molding production line includes a pneumatic control circuit, which is the pneumatic control circuit described above. Multiple balance pipes 10 of the pneumatic control circuit are arranged in a one-to-one correspondence with the first molding machine, the second molding machine and the cutting machine.

[0056] The pneumatic control loop is set up one-to-one with multiple pneumatic devices on the production line, ensuring air pressure balance and independent airflow supply among the devices. This design allows the equipment to respond more quickly during operation, reducing equipment downtime caused by unstable air pressure or insufficient airflow supply, thereby improving production efficiency. At the same time, the independent balancing pipeline 10 facilitates synchronous operation between devices, reduces mutual interference that may be caused by shared air paths, and improves the overall coordination and synchronization of the production line.

[0057] In this application, the combined volume of the three large air tanks 110 and the small air tank 131 is not less than five times the volume of the balance cylinder 120, and the volume of the small air tank 131 is approximately one time the volume of the balance cylinder 120.

[0058] When setting the pressure, close the third control ball valve 2 and the first control ball valve 133, adjust the pressure of the main pressure reducing valve 320 to the pressure relief pressure of the safety valve 170, then adjust the safety valve 170 to relieve pressure at the pressure relief pressure, adjust the pressure of the main pressure reducing valve 320 to the equilibrium pressure, open the second control ball valve 1 to release air, and when the pressure gauge 160 drops to the equilibrium pressure, close the second control ball valve 1, open the third control ball valve 2 and the first control ball valve 133 to complete the basic pressure setting.

[0059] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0060] The pneumatic control circuit of this application includes: multiple balancing pipelines 10, each balancing pipeline 10 being configured one-to-one with multiple pneumatic devices 20, each balancing pipeline 10 including a large air storage tank 110 and a balancing cylinder 120 connected thereto, the balancing cylinder 120 being used to drive the load 210 of the corresponding pneumatic device 20 to provide driving force to the load 210; an air source pipeline 30, the air source pipeline 30 being connected to the multiple balancing pipelines 10 to supply air to the multiple balancing pipelines 10; and an intermediate pipeline 40, the intermediate pipeline 40 being disposed between the multiple balancing pipelines 10 and the air source pipeline 30, any two adjacent balancing pipelines 10 being connected through the intermediate pipeline 40, and the air source pipeline 30 being connected to any one of the balancing pipelines 10 through the intermediate pipeline 40.

[0061] As can be seen, this utility model, by setting up multiple balancing pipelines 10, gas source pipelines 30, and intermediate pipelines 40, wherein each balancing pipeline 10 includes a large gas storage tank 110 and a balancing cylinder 120 connected to each other, and the intermediate pipeline 40 is set between the multiple balancing pipelines 10 and the gas source pipelines 30, any two adjacent balancing pipelines 10 are connected by the intermediate pipeline 40, so that the large gas storage tank 110 and the balancing cylinder 120 are directly connected, which improves energy efficiency. Furthermore, the large gas storage tank 110, as the gas storage and regulation center, can quickly respond to the gas demand of the balancing cylinder 120, ensuring stable power of the pneumatic equipment under load changes; the existence of the intermediate pipeline 40 allows for rapid gas exchange and balancing between any two adjacent balancing pipelines 10. In a production line or equipment group, different pneumatic devices may reach peak load or require gas replenishment at different times. The intermediate pipeline 40 can quickly transfer the gas in the storage tank under high pressure to the balance pipeline under lower pressure, thereby achieving dynamic air pressure balance and ensuring that all pneumatic devices can operate in the best condition. Therefore, the pneumatic control circuit in this application reduces the need for switching components such as solenoid valves, reduces system heat generation and energy consumption, and also reduces the investment and operating costs of related equipment. It can achieve effective load balancing of pneumatic devices at a lower cost, and is particularly suitable for scenarios that require high-speed operation and frequent load changes. It solves the problem of high production costs in the existing pulp molding production line due to the use of independent balancing pneumatic circuits for each piece of equipment.

[0062] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0063] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0064] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0065] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0066] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0067] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pneumatic control circuit, characterized in that, include: Multiple balancing pipelines (10) are provided one-to-one with multiple pneumatic devices (20). Each balancing pipeline (10) includes a large air tank (110) and a balancing cylinder (120) connected to each other. The balancing cylinder (120) is used to drive the load (210) of the corresponding pneumatic device (20) to provide driving force to the load (210). Gas source pipeline (30), which is connected to the plurality of balance pipelines (10) to supply gas to the plurality of balance pipelines (10); Intermediate pipe (40) is provided between the plurality of balancing pipes (10) and the gas source pipe (30). Any two adjacent balancing pipes (10) are connected through the intermediate pipe (40), and the gas source pipe (30) is connected to any one of the balancing pipes (10) through the intermediate pipe (40).

2. The pneumatic control circuit according to claim 1, characterized in that, The balancing pipeline (10) includes an air supply branch (130), the two ends of which are connected to the large air storage tank (110) and the balancing cylinder (120) respectively. The air supply branch (130) also includes: Small gas storage tank (131) is provided on the gas supply branch (130) and located at the end of the large gas storage tank (110) near the load (210). The small gas storage tank (131) is connected in series with the large gas storage tank (110) to provide high-pressure gas to the balance cylinder (120). A pneumatic control valve (132) is provided on the air supply branch (130) and located between the small air tank (131) and the large air tank (110) to control whether the large air tank (110) supplies air to the balance cylinder (120).

3. The pneumatic control circuit according to claim 2, characterized in that, The balancing pipeline (10) also includes: A muffler (140) is disposed at the exhaust port of the balance cylinder (120); and / or, A first control ball valve (133), a pressure reducing valve (134), an oil mist lubricator (135), and a first check valve (136) are sequentially arranged on the air supply branch (130) along the direction close to the balance cylinder (120). The first control ball valve (133), the pressure reducing valve (134), the oil mist lubricator (135), and the first check valve (136) are all located between the pneumatic control valve (132) and the small air storage tank (131).

4. The pneumatic control circuit according to claim 2, characterized in that, The pneumatic control circuit also includes multiple control lines (50), which are arranged one-to-one with the multiple balance lines (10). Both ends of each control line (50) are connected to the air source line (30) and the corresponding pneumatic control valve (132) in the balance line (10). Each control line (50) is equipped with a solenoid valve (510) to control the opening and closing of the pneumatic control valve (132).

5. The pneumatic control circuit according to claim 3, characterized in that, The balancing pipeline (10) also includes a return gas branch (150) and a second one-way valve (151) disposed on the return gas branch (150). The two ends of the return gas branch (150) are respectively connected to the supply gas branch (130). The first end of the return gas branch (150) is located between the first one-way valve (136) and the small gas storage tank (131). The second end of the return gas branch (150) is located between the pneumatic control valve (132) and the first control ball valve (133).

6. The pneumatic control circuit according to claim 3, characterized in that, The balancing pipeline (10) also includes: A pressure gauge (160) is connected to the large gas storage tank (110) to monitor the gas pressure status inside the large gas storage tank (110); A safety valve (170) is connected to one side of the large gas storage tank (110) to control whether the large gas storage tank (110) releases pressure to the outside.

7. The pneumatic control circuit according to claim 3, characterized in that, The gas source pipeline (30) is equipped with a filter (310), a main pressure reducing valve (320), and a third check valve (330). The filter (310), the main pressure reducing valve (320), and the third check valve (330) are arranged sequentially along the direction close to the balance pipeline (10). The filter (310) is used to filter the gas in the large gas storage tank (110) supplied to the balance pipeline (10), and the main pressure reducing valve (320) is used to regulate the pressure of the gas in the large gas storage tank (110) supplied to the balance pipeline (10).

8. The pneumatic control circuit according to claim 3, characterized in that, The intermediate pipeline (40) includes a first pipeline section (410) and a second pipeline section (420) and a plurality of third pipeline sections (430) spaced apart on the first pipeline section (410). The end of the second pipeline section (420) away from the first pipeline section (410) is connected to the gas source pipeline (30). The plurality of third pipeline sections (430) are arranged one-to-one with the plurality of balancing pipelines (10). The end of each third pipeline section (430) away from the first pipeline section (410) is connected to the large gas storage tank (110) of the corresponding balancing pipeline (10).

9. The pneumatic control circuit according to claim 8, characterized in that, A second control ball valve (1) is provided on at least one of the plurality of third pipe sections (430) to control the on / off state of the corresponding third pipe section (430); and / or, The third control ball valve (2) is provided on the first pipe section (410) to control the opening and closing of the first pipe section (410).

10. A pulp molding production line, characterized in that, The system includes multiple pneumatic devices, including a first molding machine, a second molding machine, and a cutting machine. The pulp molding production line includes a pneumatic control circuit, which is the pneumatic control circuit according to any one of claims 1 to 9. The multiple balance pipes (10) of the pneumatic control circuit are arranged in a one-to-one correspondence with the first molding machine, the second molding machine, and the cutting machine.

Images