Vulcanizing machine with nitrogen recovery function and process thereof

Abstract

The invention discloses a vulcanizing machine with a nitrogen recovery function and a process thereof, and relates to the technical field of vulcanizing machines, the vulcanizing machine comprises a vulcanizing machine body, the vulcanizing machine body is communicated with a recovery filter through a pipeline, the recovery filter is communicated with a nitrogen buffer tank through a pipeline, and the nitrogen buffer tank is communicated with a nitrogen compressor through a pipeline. The nitrogen compressor is communicated with a high-pressure nitrogen storage tank through a pipeline; according to the process, through nitrogen closed-loop recovery, waste nitrogen in a vulcanized cavity is filtered and then re-introduced into a raw material nitrogen loop for cyclic utilization, and the traditional process of directly discharging the waste nitrogen is eliminated.

Description

Technical Field

[0001] This invention belongs to the field of vulcanizing machine technology, specifically a vulcanizing machine and its process with nitrogen recovery function. Background Technology

[0002] As a core molding equipment in the processing of polymer materials such as rubber and plastics, the vulcanizing machine's core function is to promote the cross-linking reaction of unvulcanized rubber (or plastic) raw materials through the synergistic effect of "high temperature, high pressure, and pressure holding," ultimately forming a finished product with stable physical and chemical properties and functional uses. It is an indispensable key equipment in the rubber industry chain. During the operation of the vulcanizing machine, the rubber raw material must first be placed in the lower mold. The lower heating plate and the lower mold are driven to rise synchronously by the hydraulic cylinder on the base, so that the lower mold and the upper mold are precisely fitted together, forming a sealed cavity. Then, the upper and lower heating plates heat the upper and lower molds respectively, causing the rubber raw material inside the cavity to undergo a cross-linking reaction. At the same time, high-pressure nitrogen gas must be injected into the cavity. As an inert gas, nitrogen gas can effectively prevent the rubber from oxidizing during the high-temperature vulcanization process, ensuring the surface quality and performance stability of the product.

[0003] After the rubber vulcanization is completed and the finished product is formed, the upper and lower molds separate. The operator needs to use an air gun to inject high-pressure gas into the inner wall of the cavity of the lower mold to separate the rubber product from the inner wall of the cavity. However, the cavity of the lower mold usually has multiple integrally formed protrusions. These protrusions are used to form a specific structural shape of the product, but they result in narrow gaps and complex structures inside the cavity. Using a handheld air gun to blow them out is not only cumbersome, requiring continuous blowing while manually peeling off the product, which is time-consuming and laborious, but also makes it difficult for the high-pressure gas to penetrate into the narrow gaps between the protrusions, making it difficult to completely break the adhesion between the product and the protrusions, which can easily cause product damage or incomplete demolding, reducing the demolding efficiency of the rubber product. At the same time, the large amount of high-pressure nitrogen consumed by the vulcanizing machine during the vulcanization process is mostly directly discharged after demolding without being recycled and reused, resulting in a serious waste of nitrogen resources. To address this, we propose a vulcanizing machine and its process with nitrogen recovery function. Summary of the Invention

[0004] The purpose of this invention is to provide a vulcanizing machine and its process with nitrogen recovery function, so as to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a vulcanizing machine with nitrogen recovery function, comprising a vulcanizing machine body, a recovery filter connected to the vulcanizing machine body via a pipeline, a nitrogen buffer tank connected to the recovery filter via a pipeline, a nitrogen compressor connected to the nitrogen buffer tank via a pipeline, and a high-pressure nitrogen storage tank connected to the nitrogen compressor via a pipeline. The vulcanizing machine body is also connected to a vacuum filter via a pipeline, the vacuum filter is connected to a vacuum buffer tank via a pipeline, and the vacuum buffer tank is connected to a vacuum pump via a pipeline.

[0006] Preferably, the vulcanizing machine body includes a base, a sliding table, and an upper mold base. A lower heating plate is provided on the top of the sliding table, and a lower template is fixedly provided on the lower heating plate. An upper heating plate is provided at the bottom of the upper mold base, and an upper template is fixedly provided at the bottom of the upper heating plate. A cavity is formed inside the lower template. The lower template is provided with a demolding mechanism, which includes multiple hollow push rods that are slidably disposed inside the lower template and a hollow long plate fixed to the top of the hollow push rods. The hollow long plate is used to push the rubber product in the cavity upward. The upper surface of the lower template is provided with an embedding groove for embedding a hollow long plate; The hollow long plate has multiple top outlets and side outlets evenly distributed on its top, two sides and along its length. The top outlets and side outlets are used to blow air between the inner wall of the cavity and the rubber product for demolding.

[0007] Preferably, the sliding table has an internal movable groove, and a hydraulic rod is fixedly installed at the bottom of the inner wall of the movable groove. A hollow long box is fixedly installed at the working end of the hydraulic rod.

[0008] Preferably, a conveying pipe is fixedly installed inside the sliding table. One end of the conveying pipe is fixedly connected to the hollow long box through a telescopic pipe, and a first connector is fixedly installed at the other end of the conveying pipe. A first valve is installed on the outside of the first connector to control the flow rate of the incoming cooling air.

[0009] Preferably, a second connector is fixedly provided at the other end of the conveying pipe, and a second valve is provided on the outside of the second connector to control the flow rate of the incoming hot gas.

[0010] Preferably, the hollow long plate is provided with multiple sets of sealing components inside, the sealing components including: The limiting rod fixed to the inner wall of the hollow long plate and the blocking ring set above the limiting rod are used to seal the top outlet.

[0011] Preferably, a wing plate is slidably disposed on the limiting rod, and a plug ring is fixedly disposed on the top of the wing plate by a connecting rod.

[0012] Preferably, a connecting spring is sleeved on the outside of the limiting rod.

[0013] Preferably, the base is provided with four guide posts on its exterior; The base is equipped with a hydraulic cylinder.

[0014] This invention also discloses a process with nitrogen recovery function, specifically including the following steps: S1, Raw material nitrogen circuit: After the rubber is installed in the lower mold, the upper and lower molds are closed. The raw material nitrogen enters the pipeline through the nitrogen inlet, and then enters the nitrogen buffer tank through the pressure measuring transmitter and the nitrogen purity analyzer to balance the pressure fluctuation of the raw material nitrogen. Subsequently, the nitrogen enters the nitrogen compressor to compress the low-pressure nitrogen into high-pressure nitrogen. S2. High-pressure nitrogen enters the high-pressure nitrogen storage tank for storage, and then enters the mold cavity in the vulcanizing machine body through the vulcanizing machine inlet. At the same time, the high-pressure nitrogen in the high-pressure nitrogen storage tank enters the mold cavity through the shaping nitrogen branch manual valve and the shaping nitrogen pressure transformer in sequence. S3, Nitrogen recovery circuit: When the vulcanization is completed and cooled, the waste nitrogen in the cavity passes through the high-pressure nitrogen recovery port and the recovery check valve in sequence and enters the recovery filter for filtration. The filtered nitrogen then enters steps S1 and S2 for circulation. S4. At this time, the nitrogen pressure will increase when it passes through the pressure measuring transmitter. When it rises to the design pressure value, the nitrogen replenishment programmable valve will close. S5, Waste Gas Recovery Circuit: The waste gas in the mold cavity enters the vacuum filter through the vacuum port to filter impurities in the waste nitrogen gas, and then enters the vacuum buffer tank for pressure buffering. At this time, the vacuum pump generates negative pressure suction.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) This process uses closed-loop nitrogen recovery to filter the waste nitrogen in the mold cavity after vulcanization and reconnect it to the raw material nitrogen circuit for recycling. This eliminates the traditional process of directly discharging waste nitrogen, effectively saves nitrogen consumption, and significantly reduces operating costs. At the same time, the vacuum circuit thoroughly removes impurities and waste gas inside the mold cavity. Combined with the anti-oxidation protection of high-pressure nitrogen and the pressure control function of shaping nitrogen, it creates a clean and stable environment for rubber vulcanization, greatly reducing defects such as bubbles, oxidation, and dimensional deviations in the product, and ensuring product quality.

[0016] (2) The present invention, through the designed demolding mechanism, the pushing action of the hollow ejector rod and the hollow long plate, combined with the blowing function of the top outlet and the side outlet, adapts to the complex structure with protrusions in the cavity, completely breaks the adhesion between the product and the cavity, and facilitates demolding. During the demolding process, the hot and cold airflows can be blown in a gradient ratio through the first valve and the second valve. In the initial stage, a mild airflow is formed to avoid defects such as cold shrinkage cracks and internal stress concentration caused by sudden cooling of the product. Subsequently, the cooling and shaping effect is enhanced by adjusting the opening of the first valve and the second valve. At the same time, the slight shrinkage effect generated by moderate cooling further assists demolding, thus maximizing the structural integrity of the rubber product.

[0017] (3) The present invention uses a designed sealing component, through the coordinated cooperation of a limiting rod, a blocking ring, a connecting spring, a wing plate, etc., to tightly seal the top outlet during vulcanization, preventing rubber from entering the cavity and causing blockage, thus ensuring the vulcanization effect. During demolding, the wing plate is driven to slide down by airflow pressure and Bernoulli effect, which drives the blocking ring to automatically descend and open without additional control, protecting the demolding airflow channel, reducing equipment failure, and ensuring the vulcanization quality and demolding efficiency of the product. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process flow structure of the present invention; Figure 2 This is a schematic diagram of the vulcanizing machine body structure of the present invention; Figure 3 This is a bottom view of the vulcanizing machine body of the present invention; Figure 4 This is a schematic diagram of the sliding table structure of the present invention; Figure 5 This is a cross-sectional view of the sliding table, lower heating plate, and lower template of the present invention. Figure 6 This is a schematic diagram of the hollow push rod structure of the present invention; Figure 7 This is a schematic diagram of the hollow long plate structure of the present invention; Figure 8 This is a schematic cross-sectional view of the hollow long plate structure of the present invention; Figure 9 This is a schematic diagram of the wing plate structure of the present invention; Figure 10 This is a schematic diagram of the side outlet and top outlet structure of the present invention; In the diagram: 100, Nitrogen inlet; 101, First pressure gauge; 102, Nitrogen replenishment programmable valve; 103, Nitrogen replenishment check valve; 104, Pressure transmitter; 105, Nitrogen purity analyzer transmitter; 106, Nitrogen buffer tank; 107, Recovery filter; 108, Nitrogen compressor; 109, Online flow meter; 110, High-pressure nitrogen check valve; 111, High-pressure nitrogen storage tank; 112, High-pressure tank outlet valve; 113, High-pressure tank outlet check valve; 114, Vacuum pump; 115, Vacuum buffer tank; 116, Vacuum pressure transformer; 117, Standard nitrogen branch manual valve; 118, Vacuum filter; 119, Standard nitrogen pressure transformer; 120, Vacuum pressure gauge; 121, Vacuum port; 12 2. Vulcanizing machine inlet; 123. High-pressure nitrogen manual valve; 124. High-pressure tank outlet pressure; 125. Recovery check valve; 126. High-pressure tank outlet nitrogen pressure; 200. Vulcanizing machine body; 201. Upper mold base; 202. Upper template; 203. Guide pillar; 204. Sliding table; 205. Base; 206. Lower heating plate; 207. Lower template; 208. Upper heating plate; 300. Conveying pipe; 301. Hollow top rod; 302. Hollow long box; 303. Hydraulic rod; 304. Hollow long plate; 305. Embedded groove; 307. Telescopic pipe; 309. Plug ring; 310. Connecting spring; 311. Wing plate; 312. Connecting rod; 313. Limiting rod; 314. Side outlet; 315. Top outlet. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 Please see Figures 1-8 , Figure 10 The present invention provides a technical solution: a vulcanizing machine with nitrogen recovery function, including a vulcanizing machine body 200, a recovery filter 107 connected to the vulcanizing machine body 200 through a pipeline, a nitrogen buffer tank 106 connected to the recovery filter 107 through a pipeline, a nitrogen compressor 108 connected to the nitrogen buffer tank 106 through a pipeline, a high-pressure nitrogen storage tank 111 connected to the vulcanizing machine body 200 through a pipeline; The vulcanizing machine body 200 is also connected to a vacuum filter 118 via a pipeline, the vacuum filter 118 is connected to a vacuum buffer tank 115 via a pipeline, and the vacuum buffer tank 115 is connected to a vacuum pump 114 via a pipeline. A recovery check valve 125 is installed between the vulcanizing machine body 200 and the recovery filter 107. A nitrogen replenishment check valve 103 is connected to one side of the nitrogen buffer tank 106 through a pipeline. A pressure measuring transmitter 104 and a nitrogen purity analyzer transmitter 105 are respectively installed between the nitrogen replenishment check valve 103 and the nitrogen buffer tank 106. A nitrogen replenishment programmable valve 102 and a first pressure gauge 101 are connected to the nitrogen replenishment check valve 103 through a pipeline. A high-pressure nitrogen check valve 110 is installed between the nitrogen compressor 108 and the high-pressure nitrogen storage tank 111. A high-pressure nitrogen storage tank 111 is connected to the vulcanizing machine body 200 by a high-pressure tank outlet valve 112, an online flow meter 109, a high-pressure tank outlet check valve 113, a high-pressure tank outlet pressure 124, a high-pressure tank outlet nitrogen pressure 126, and a high-pressure nitrogen manual valve 123. A sizing nitrogen branch manual valve 117 and a sizing nitrogen pressure transformer 119 are installed between the high-pressure tank outlet nitrogen pressure 126 and the vulcanizing machine body 200. A vacuum pressure gauge 120 is installed between the vulcanizing machine body 200 and the vacuum filter 118, and a vacuum pressure transformer 116 is installed between the vacuum filter 118 and the vacuum buffer tank 115.

[0021] Example 2 Please refer to Example 1. Figures 1-8 , Figure 10 The vulcanizing machine body 200 includes a base 205, a sliding table 204, and an upper mold base 201. A lower heating plate 206 is provided on the top of the sliding table 204, and a lower template 207 is fixedly provided on the lower heating plate 206. An upper heating plate 208 is provided at the bottom of the upper mold base 201, and an upper template 202 is fixedly provided at the bottom of the upper heating plate 208. A cavity is formed inside the lower template 207. After the upper template 202 and the lower template 207 are closed, a closed cavity is formed. The rubber raw material undergoes a cross-linking reaction when heated in the cavity. The base 205 has four guide posts 203 on its exterior, and the sliding table 204 is slidably mounted on the guide posts 203. A hydraulic cylinder is installed inside the base 205. The working end of the hydraulic cylinder is fixedly connected to the sliding table 204. The hydraulic cylinder can drive the sliding table 204 to move up and down. A demolding mechanism is provided on the lower template 207. The demolding mechanism includes multiple hollow ejector rods 301 that are slidably disposed inside the lower template 207 and a hollow long plate 304 fixed to the top of the hollow ejector rods 301. The hollow long plate 304 is used to push the rubber product in the cavity upward. The upper surface of the lower template 207 is provided with an embedding groove 305 for embedding the hollow long plate 304; The hollow long plate 304 has multiple top outlets 315 and side outlets 314 evenly distributed on its top, both sides, and along its length. (During vulcanization, since the hollow long plate 304 is located inside the embedding groove 305, the side outlets 314 are blocked by the inner wall of the embedding groove 305 and become closed, preventing rubber from entering the interior of the side outlets 314 during vulcanization.) The top outlets 315 and side outlets 314 are used to blow air between the inner wall of the cavity and the rubber product for demolding. After vulcanization, the lower mold plate 207 moves downward under the action of the hydraulic cylinder. At this time, the upper mold plate 202 and the lower mold plate 207 separate. The hollow push rod 301 drives the hollow long plate 304 to move upward. At the same time, the top outlet 315 on the top of the hollow long plate 304 and the side outlets 314 on both sides blow air between the inner wall of the cavity and the rubber product. The airflow separates the rubber product from the cavity, and the demolding is achieved in conjunction with the pushing action of the push rod. The sliding table 204 has an internal movable groove. A hydraulic rod 303 is fixedly installed at the bottom of the inner wall of the movable groove. A hollow long box 302 is fixedly installed at the working end of the hydraulic rod 303. A hollow push rod 301 is fixed at the top of the hollow long box 302. The hollow push rod 301 can also move up and down inside the lower heating plate 206 and the sliding table 204. When demolding is required, the hydraulic rod 303 starts and extends upward, driving the hollow long box 302 to rise synchronously. The hollow long box 302 drives the hollow push rod 301 at the top to move upward. The hollow push rod 301 then pushes the hollow long plate 304 at the top to lift the rubber product upward, cooperating with the top outlet 315 and the side outlet 314. After demolding is completed, the hydraulic rod 303 retracts, driving the hollow long box 302, the hollow push rod 301 and the hollow long plate 304 to reset. The hollow long plate 304 is re-embedded in the embedding groove 305 to prepare for the next vulcanization. The sliding table 204 is fixedly equipped with a conveying pipe 300. One end of the conveying pipe 300 is fixedly connected to the hollow long box 302 through a telescopic pipe 307. The other end of the conveying pipe 300 is fixedly equipped with a first connector. The first connector is equipped with a first valve on the outside to control the flow rate of the incoming cooling air. The first connector is connected to an external air cooler. The other end of the delivery pipe 300 is also fixedly equipped with a second connector. The second connector is equipped with a second valve on the outside to control the flow rate of the incoming hot air. The second connector is connected to an external hot air blower. In the initial stage of blowing, the first valve and the second valve are opened simultaneously and each is partially opened. Through the precise ratio of hot air and cold air, the temperature of the blown mixed airflow tends to be mild, avoiding the direct and sudden cooling of the cavity and internal rubber products by pure cold air. This prevents the product from developing defects such as cold shrinkage cracks and internal stress concentration due to excessive temperature difference, and ensures the integrity of the product structure. After the cooling process has progressed for a period of time and the rubber product has initially cooled and set, the openings of the first and second valves are adjusted. The opening of the first valve is increased to enhance the cooling airflow, while the opening of the second valve is decreased to reduce the hot air input. This gradually lowers the cooling temperature of the mixed airflow, enhancing the final cooling and setting effect of the product. Simultaneously, the slight shrinkage effect generated by moderate cooling, combined with the pushing action of the hollow 304 long plate and airflow purging, further breaks down the adhesion between the rubber product and the mold cavity (including the gaps between the protrusions), achieving smooth and efficient demolding. After demolding, the operator removes the rubber product. At this point... Continuing with the blowing process, some attached rubber debris and other contaminants on the inner wall of the cavity in the lower mold 207 can be blown out and cleaned. (The rubber raw material undergoes high-temperature and high-pressure vulcanization in the cavity. Due to issues such as mold fitting gaps and overflow groove design, some raw material may overflow in small amounts and adhere to the inner wall of the cavity. At the same time, tiny impurities or incompletely cross-linked rubber particles in the raw material will remain after vulcanization, forming debris. If rubber debris remains, it will cause defects such as scratches and embedded impurities on the surface of the next batch of products, and may even affect the mold fitting accuracy. Blowing and cleaning can ensure the cavity is clean and guarantee the stability of the quality of subsequent products.) Furthermore, during the vulcanization process, if the local temperature inside the cavity is insufficient, or if temperature compensation is required for a specific area, the second valve can be opened. Hot air enters the hollow elongated box 302 through the conveying pipe 300 and the telescopic pipe 307, and then is ejected through the top outlet 315 and side outlet 314 of the hollow ejector rod 301 and the hollow elongated plate 304, providing precise heating and supplementation to the inside of the cavity. At the same time, if the product is tightly adhered to the cavity before demolding, an appropriate amount of hot air can be introduced first. The principle of thermal expansion and contraction is used to make the rubber product expand slightly, reduce the adhesion force, and assist in demolding. The hot air flow rate is regulated by the second valve to avoid excessive temperature affecting product performance.

[0022] Example 3 Please refer to Example 2. Figure 2 , Figures 4-10 The hollow long plate 304 is provided with multiple sets of sealing components. The sealing components include a limiting rod 313 fixed to the inner wall of the hollow long plate 304 and a blocking ring 309 disposed above the limiting rod 313, which are used to block the top outlet 315. A wing plate 311 is slidably mounted on the limiting rod 313 (the wing plate 311 is like an inverted wing, with a convex and curved lower surface where the airflow is slow and the pressure is high; and a flat upper surface where the airflow is fast and the pressure is low. According to the Bernoulli effect, the pressure is low where the airflow is fast. The lower surface of the wing plate 311 has a high flow velocity, forming a high-pressure area; the lower surface has a high flow velocity, forming a low-pressure area. The pressure difference between the upper and lower surfaces generates a downward force, and the gas blowing towards the wing plate 311 pushes the wing plate 311 down along the limiting rod 313). A blocking ring 309 is fixedly mounted on the top of the wing plate 311 through the connecting rod 312, and the top of the limiting rod 313 passes through the interior of the blocking ring 309. A connecting spring 310 is sleeved on the outside of the limiting rod 313. The top of the connecting spring 310 is fixedly connected to the wing plate 311, and the bottom of the connecting spring 310 is fixedly connected to the bottom of the inner wall of the hollow long plate 304. During the vulcanization process, the sealing ring 309 seals the top outlet 315 to prevent the high-temperature and high-pressure gas inside the cavity from leaking out of the top outlet 315, ensuring the sealing and pressure stability of the cavity and ensuring the full progress of the rubber vulcanization reaction. When air blowing is required for demolding, gas is introduced into the hollow long plate 304, and the air pressure pushes the wing plate 311 to move downward, which in turn moves the sealing ring 309 downward, opening the top outlet 315 and spraying the gas out from the top outlet 315 to achieve the air blowing function. After demolding is completed, the air pressure disappears, and the wing plate 311 moves upward and resets under the push of the connecting spring 310, which in turn moves the sealing ring 309 upward and resets to re-seal the top outlet 315.

[0023] Example 4 Please refer to Example 3. Figures 1-4 The present invention also discloses a process with nitrogen recovery function, the entire process being automatically controlled by a PLC control system, specifically including the following steps: S1, Raw Material Nitrogen Circuit: After rubber is inserted into the lower mold plate 207, the upper mold plate 202 and the lower mold plate 207 are closed. The external raw material nitrogen enters the pipeline through the nitrogen inlet 100, and then enters the nitrogen buffer tank 106 through the pressure measuring transmitter 104 (the pressure measuring transmitter 104 is used to detect the nitrogen pressure of the target circuit in real time, convert the pressure signal into a standard electrical signal and feed it back to the PLC control system) and the nitrogen purity analyzer transmitter 105 (the nitrogen purity analyzer transmitter 105 monitors the nitrogen purity in real time to ensure that it meets the requirements of the vulcanization process and avoids rubber oxidation or product defects) to balance the pressure fluctuation of the raw material nitrogen. During this period, the first pressure gauge 101 will detect the nitrogen pressure entering this pipeline. Then the nitrogen enters the nitrogen compressor 108 to compress the low-pressure nitrogen into high-pressure nitrogen. S2. High-pressure nitrogen gas passes through high-pressure nitrogen check valve 110 (which allows unidirectional flow of high-pressure nitrogen to prevent backflow and protect equipment pressure stability) into high-pressure nitrogen storage tank 111 for storage. Then, the high-pressure nitrogen gas passes through high-pressure tank outlet valve 112 (controlling the on / off flow of high-pressure nitrogen), online flow meter 109 (measuring nitrogen flow to ensure the gas supply meets process requirements), high-pressure tank outlet check valve 113 (preventing nitrogen backflow and protecting the storage tank and upstream equipment), high-pressure tank outlet pressure 124 (a pressure gauge that automatically controls nitrogen flow and works with the PLC control system to automate the process), high-pressure tank outlet nitrogen pressure 126 (a pressure gauge that monitors the main output nitrogen pressure in real time and sends a feedback signal to the PLC control system to ensure the pressure remains stable within the process requirements range and avoids pressure fluctuations affecting vulcanization quality), and high-pressure nitrogen manual valve 123 (used for maintenance, emergency shut-off, or...). During process debugging, the main circuit switch is precisely adjusted as a supplementary guarantee to the automatic control. Then, it enters the cavity of the vulcanizing machine body 200 through the vulcanizing machine inlet 122 (high-pressure nitrogen prevents rubber oxidation, seals the cavity, and ensures the stability of the vulcanization reaction). At the same time, the high-pressure nitrogen in the high-pressure nitrogen storage tank 111 (the high-pressure nitrogen from the high-pressure tank outlet nitrogen pressure 126 not only enters the main circuit of the high-pressure nitrogen manual valve 123, but also enters the shaping nitrogen branch manual valve 117 from another branch) becomes shaping nitrogen through the shaping nitrogen branch manual valve 117 and the shaping nitrogen pressure transformer 119. The shaping nitrogen enters the cavity (first, the branch is opened through the shaping nitrogen branch manual valve 117 for preliminary flow control, and then the high-pressure nitrogen is reduced and stabilized by the shaping nitrogen pressure transformer 119 and the PLC control system to finally become the shaping nitrogen that meets the requirements of "precise shaping". The shaped nitrogen can be precisely controlled to allow the rubber blank to fit the mold and be shaped, ensuring the product size and contour accuracy). S3, Nitrogen recovery circuit: When the vulcanization is completed and cooled, the waste nitrogen in the cavity passes through the high-pressure nitrogen recovery port and the recovery check valve 125 (to allow the recovered nitrogen to flow in one direction and prevent backflow) in sequence, and enters the recovery filter 107 (to filter impurities such as rubber debris in the recovered nitrogen, protect the equipment and ensure product quality) for filtration. The filtered nitrogen enters the S1 and S2 steps for circulation. After being processed by the recovery filter 107, the nitrogen gas returns to the starting point of the raw material nitrogen gas loop (between the pressure measuring transmitter 104 and the nitrogen purity analyzer transmitter 105). Then, along with the raw material nitrogen gas, it is compressed by the compressor and stored in the high-pressure storage tank (step S2). It is then reintroduced into the mold cavity for the next vulcanization, forming a closed-loop cycle of "nitrogen gas use, recovery, and reuse" to achieve the purpose of energy saving and consumption reduction. By using a nitrogen recovery loop, the traditional direct emission process is eliminated, which greatly and effectively saves costs. S4. At this time, the nitrogen pressure will increase when it passes through the pressure measuring transmitter 104. When it rises to the design pressure value, the nitrogen replenishment programmable valve 102 will close. After the recovered nitrogen enters the starting point, the pressure measuring transmitter 104 will detect that the total nitrogen pressure is up to standard and will automatically close the nitrogen replenishment programmable valve 102 to replenish new nitrogen, and will no longer replenish nitrogen. If the pressure measuring transmitter 104 detects that the total nitrogen pressure is not up to standard, the nitrogen replenishment programmable valve 102 will open to replenish a portion of new nitrogen. S5, Waste gas recovery circuit: The waste gas in the cavity enters the vacuum filter 118 through the vacuum port 121 to filter impurities in the waste nitrogen gas, and then enters the vacuum buffer tank 115 for pressure buffering. At this time, the vacuum pump 114 generates negative pressure suction (the vacuum pump 114 is a negative pressure source device).

[0024] Working principle and usage process of this invention: When using this invention, the rubber raw material is placed into the cavity of the lower template 207. The hydraulic cylinder inside the base 205 operates, driving the sliding table 204 to slide upward along the guide post 203, so that the lower template 207 and the upper template 202 at the bottom of the upper mold base 201 are precisely fitted to form a sealed cavity. Then, the upper heating plate 208 and the lower heating plate 206 heat the upper template 202 and the lower template 207 respectively, providing high-temperature conditions for the cross-linking reaction of the rubber raw material. At the same time, high-pressure nitrogen is injected into the cavity. Nitrogen is an inert gas to prevent the rubber from oxidizing during the high-temperature vulcanization process. At this time, the hollow long plate 304 is embedded in the embedding groove 305 of the lower template 207. The blocking ring 309 seals the top outlet 315 under the action of the connecting spring 310, and the side outlet 314 is sealed by the inner wall of the embedding groove 305 to ensure the sealing of the cavity. After vulcanization, the hydraulic cylinder drives the sliding table 204 downward, separating the upper mold plate 202 from the lower mold plate 207. Then, the hydraulic rod 303 inside the sliding table 204 starts and extends upward, driving the hollow long box 302, the hollow push rod 301, and the hollow long plate 304 upward. The hollow long plate 304 pushes the rubber product inside the cavity. Simultaneously, cooling gas and hot gas are introduced through the first and second joints of the conveying pipe 300, respectively, entering the hollow long box 302 through the telescopic pipe 307, and then entering the hollow long plate 304 through the hollow push rod 301. After the hollow long plate 304 is pushed, the wing plate 311 is pushed to slide downward along the limiting rod 313. At this time, the wing plate 311 overcomes the elastic force of the connecting spring 310, and the connecting spring 310 begins to compress. Through the connecting rod 312, the blocking ring 309 moves downward, and the top outlet 315 is opened. At the same time, the hollow long plate 304 moves upward, causing the side outlet 314 to disengage from the obstruction of the embedded groove 305. Gas is ejected from the top outlet 315 and the side outlet 314 and blown towards the inner wall of the cavity and the rubber product. The airflow impact force breaks the adhesion between the two. With the pushing action of the hollow long plate 304, efficient demolding is achieved. During demolding, the flow rates of cooling gas and hot gas can be adjusted by the first valve and the second valve respectively. In the initial stage, the temperature of the mixed airflow is kept mild to avoid defects in the rubber product due to excessive temperature difference. Subsequently, the opening of the first valve and the second valve is adjusted to enhance the cooling and shaping effect. At the same time, a slight shrinkage effect is used to assist demolding. After demolding, the working end of the hydraulic rod 303 retracts, driving the hollow long box 302, the hollow push rod 301 and the hollow long plate 304 to reset. The hollow long plate 304 is re-embedded in the embedding groove 305, and the wing plate 311 rises and begins to unfold under the action of the connecting spring 310, pushing the blocking ring 309 to move upward to seal the top outlet 315, preparing for the next vulcanization.

[0025] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A vulcanizing machine with nitrogen recovery function, comprising a vulcanizing machine body, characterized in that, The vulcanizing machine body is connected to a recovery filter via a pipeline, the recovery filter is connected to a nitrogen buffer tank via a pipeline, the nitrogen buffer tank is connected to a nitrogen compressor via a pipeline, and the nitrogen compressor is connected to a high-pressure nitrogen storage tank via a pipeline. The vulcanizing machine body is also connected to a vacuum filter via a pipeline, the vacuum filter is connected to a vacuum buffer tank via a pipeline, and the vacuum buffer tank is connected to a vacuum pump via a pipeline.

2. A vulcanizing machine with nitrogen recovery function according to claim 1, characterized in that, The vulcanizing machine body includes a base, a sliding table, and an upper mold base. A lower heating plate is provided on the top of the sliding table, and a lower template is fixedly provided on the lower heating plate. An upper heating plate is provided at the bottom of the upper mold base, and an upper template is fixedly provided at the bottom of the upper heating plate. A cavity is formed inside the lower template. The lower template is provided with a demolding mechanism, which includes multiple hollow push rods that are slidably disposed inside the lower template and a hollow long plate fixed to the top of the hollow push rods. The hollow long plate is used to push the rubber product in the cavity upward. The upper surface of the lower template is provided with an embedding groove for embedding a hollow long plate; The hollow long plate has multiple top outlets and side outlets evenly distributed on its top and two sides, as well as along its length. The top outlets and side outlets are used to blow air between the inner wall of the cavity and the rubber product for demolding.

3. A vulcanizing machine with nitrogen recovery function according to claim 2, characterized in that, The sliding table has an internal movable groove, and a hydraulic rod is fixedly installed at the bottom of the inner wall of the movable groove. A hollow long box is fixedly installed at the working end of the hydraulic rod.

4. A vulcanizing machine with nitrogen recovery function according to claim 3, characterized in that, The sliding platform is equipped with a conveying pipe. One end of the conveying pipe is fixedly connected to the hollow long box through a telescopic pipe. The other end of the conveying pipe is fixedly equipped with a first connector. The outside of the first connector is equipped with a first valve to control the flow rate of the incoming cooling air.

5. A vulcanizing machine with nitrogen recovery function according to claim 4, characterized in that, The other end of the conveying pipe is also fixedly equipped with a second connector, and the outside of the second connector is equipped with a second valve to control the flow rate of the incoming hot gas.

6. A vulcanizing machine with nitrogen recovery function according to claim 2, characterized in that, The hollow long plate is internally provided with multiple sets of sealing components, including: The limiting rod fixed to the inner wall of the hollow long plate and the blocking ring set above the limiting rod are used to seal the top outlet.

7. A vulcanizing machine with nitrogen recovery function according to claim 6, characterized in that, A wing plate is slidably mounted on the limiting rod, and a plug ring is fixedly mounted on the top of the wing plate by a connecting rod.

8. A vulcanizing machine with nitrogen recovery function according to claim 6, characterized in that, A connecting spring is sleeved on the outside of the limiting rod.

9. A vulcanizing machine with nitrogen recovery function according to claim 2, characterized in that, The base is provided with four guide pillars on its exterior; The base is equipped with a hydraulic cylinder.

10. A process with nitrogen recovery function according to any one of claims 1-9, characterized in that, Specifically, the following steps are included: S1, Raw material nitrogen circuit: After the rubber is installed in the lower mold, the upper and lower molds are closed. The raw material nitrogen enters the pipeline through the nitrogen inlet, and then enters the nitrogen buffer tank through the pressure measuring transmitter and the nitrogen purity analyzer to balance the pressure fluctuation of the raw material nitrogen. Subsequently, the nitrogen enters the nitrogen compressor to compress the low-pressure nitrogen into high-pressure nitrogen. S2. High-pressure nitrogen enters the high-pressure nitrogen storage tank for storage, and then enters the mold cavity in the vulcanizing machine body through the vulcanizing machine inlet. At the same time, the high-pressure nitrogen in the high-pressure nitrogen storage tank enters the mold cavity through the shaping nitrogen branch manual valve and the shaping nitrogen pressure transformer in sequence. S3, Nitrogen recovery circuit: When the vulcanization is completed and cooled, the waste nitrogen in the cavity passes through the high-pressure nitrogen recovery port and the recovery check valve in sequence and enters the recovery filter for filtration. The filtered nitrogen then enters steps S1 and S2 for circulation. S4. At this time, the nitrogen pressure will increase when it passes through the pressure measuring transmitter. When it rises to the design pressure value, the nitrogen replenishment programmable valve will close. S5, Waste Gas Recovery Circuit: The waste gas in the mold cavity enters the vacuum filter through the vacuum port to filter impurities in the waste nitrogen gas, and then enters the vacuum buffer tank for pressure buffering. At this time, the vacuum pump generates negative pressure suction.

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