A control method of an intelligent quantitative feeding and drying system

Abstract

The present application relates to a kind of control method of intelligent quantitative feeding drying system, through intelligent control and accurate prompt guide operator to carry out strict raw material drying management, can effectively avoid the situation that raw material drying time is too long and leads to excessive drying or drying time is too short and leads to drying insufficient, to ensure that the plastic raw material of injection molding machine is in the best processing state, to further guarantee the quality of injection molding product, effectively reduce the defective rate, reduce the waste of raw material, greatly improve production efficiency. Meanwhile, through accurate control and automatic operation, it can also reduce labor intensity, reduce human error and raw material waste in production process, provide reliable guarantee and support for production.

Description

Technical Field

[0001] This invention relates to the field of plastic product feeding and drying systems, and in particular to a control method for an intelligent quantitative feeding and drying system. Background Technology

[0002] In the manufacturing process of plastic products, some specific plastic products have very strict requirements regarding drying time. If the drying time is below or above the range specified by the process, it will have a significant impact on the final plastic product.

[0003] For plastic products that require precise control of drying time, if the drying time is too short, the residual moisture in the raw material may not evaporate completely, which may cause quality problems such as blistering on the product surface and internal pores during the injection molding process. Conversely, if the drying time is too long, the plastic raw material may be over-dried, causing the plastic molecular chains to break or oxidize, thereby affecting the physical properties and appearance quality of the plastic product.

[0004] Therefore, strictly controlling drying time is one of the key aspects of ensuring stable product quality in plastic product manufacturing. Precise control of drying time ensures that plastic raw materials reach their optimal processing state, thereby guaranteeing the quality of injection-molded products, reducing defect rates, minimizing raw material waste, and significantly improving production efficiency. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a control method for an intelligent quantitative feeding and drying system. Through intelligent control and accurate prompts, the system guides operators to strictly manage the drying of raw materials, effectively avoiding over-drying due to excessive drying time or under-drying due to insufficient drying time. This ensures that the plastic raw materials of the injection molding machine are in the optimal processing state, thereby guaranteeing the quality of injection molded products, effectively reducing the defect rate, reducing material waste, and greatly improving production efficiency.

[0006] The technical solution adopted by this invention to solve its technical problem is: to provide a control method for an intelligent quantitative feeding and drying system, the control method comprising the following steps: S1. The system calculates the initial feeding preparation time td=ta-TB-TC and the start drying time te=ta-TB based on the customer's preset injection molding machine start-up production time ta, raw material drying time TB, and preset preparation time TC. S2. When the system waits for the first feeding preparation time point td, the system controls the weighing and mixing machine to accurately weigh the raw materials and secondary materials according to the preset hourly raw material usage W1 and the percentage of secondary materials. The weighed mass is W1. After being mixed evenly, the materials fall into the suction box. The suction box is equipped with a low material level switch to detect the storage status of raw materials in the suction box. S3. The system controls the feeder to transport the mixed raw materials weighed according to the proportion in the suction box of the weighing mixer to the material barrel of the dryer through the pipeline and the suction hopper. The low material level switch of the suction box of the weighing mixer confirms that the raw materials have been sucked out. S4. After the system waits until the start drying time point te, the system controls the dryer to start drying the raw material. S5. The system waits for the next feeding time point, which is td + n hours, where n is a natural number less than or equal to TB, and TB can be an integer or contain decimals; S6. After the next feeding time point arrives, continue to repeat S2 and S3 above until the feeding action of the raw material for the integer part of TB+1 times is completed. The mass of the last feeding is the fractional part of TB multiplied by W1. When the last feeding is completed, the system should detect that the full material signal becomes valid after the feeding through the high material level switch arranged in the dryer. S7. After the system waits for the injection molding machine to start production at time ta, it sends a raw material drying OK signal to the injection molding machine. S8. The system continuously monitors the injection molding production time and the high-level switch located in the dryer. Each time, when the injection molding production time is not less than 1 hour and the high-level switch detects that the raw material in the barrel is lower than the material level, the system controls the weighing and mixing machine to accurately weigh the raw material and the secondary material according to the preset hourly raw material consumption W1 and the percentage of secondary material. The weighed mass is W1. After being mixed evenly, it falls into the suction box. The suction box is equipped with a low-level switch to detect the storage status of the raw material in the suction box. S9. The system controls the feeder to transport the proportionally weighed mixed raw materials in the weighing mixer's suction box to the dryer's material hopper. The low material level switch of the weighing mixer's suction box confirms that the raw materials have been sucked out.

[0007] As a supplement to the technical solution described in this invention, the TC preparation time is equal to the total time of actual weighing by the weighing mixer and conveying by the feeding machine.

[0008] As a supplement to the technical solution described in this invention, when the injection molding production task needs to be temporarily interrupted for more than 20 minutes due to special reasons, the control system can be manually switched to the pause mode. After entering the mode, the system will automatically record the time TF of entering the mode, and automatically lower the drying temperature setting of the dryer by 5 degrees to continue drying operation. Then the system enters the standby state of the pause mode.

[0009] As a supplement to the technical solution described in this invention, when the injection molding production task needs to be resumed, the system can attempt to switch to continuous production mode by canceling the pause. The system first automatically restores the drying set temperature of the dryer, and then the system compares the pause time TF with the preset allowable pause time TG, and determines whether to switch to continuous production mode based on the result: when TF does not exceed TG, the system will automatically calculate and pop up a window asking the operator to confirm the release of the raw material mass W2 that has been drying for too long in the drying barrel, W2 = 50% * W1 * TF. After the operator releases an equal mass of raw material and confirms the operation, the system switches to continuous production mode and sets the current injection molding production time to 50% * TF, and continues to repeat the steps of S8 above; when TF exceeds TG, the system will determine that production cannot be resumed due to the excessive pause time, and all raw materials in the dryer need to be released, and then start again from S1.

[0010] As a supplement to the technical solution described in this invention, the TG < 2 hours.

[0011] Beneficial Effects: This invention relates to a control method for an intelligent quantitative feeding and drying system. Through intelligent control and accurate prompts, it guides operators to strictly manage raw material drying, effectively preventing over-drying due to excessive drying time or under-drying due to insufficient drying time. This ensures the plastic raw materials in the injection molding machine are in optimal processing condition, thereby guaranteeing the quality of injection molded products, effectively reducing defect rates, minimizing material waste, and significantly improving production efficiency. Simultaneously, precise control and automated operation reduce labor intensity, minimize human error and material waste during production, and provide reliable assurance and support for production. Attached Figure Description

[0012] Figure 1 This is a flowchart under normal circumstances of the present invention; Figure 2 This is a flowchart of the present invention when the injection molding production task needs to be suspended due to special reasons; Figure 3 This is a schematic diagram showing the changes to the drying drum of the present invention; Figure 4 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0013] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0014] The embodiments of the present invention relate to a control method for an intelligent quantitative feeding and drying system, such as... Figure 1-4 As shown, the control method includes the following steps: S1. The system calculates the first feeding preparation time td=ta-TB-TC and the start drying time te=ta-TB based on the customer's preset injection molding machine start-up production time ta, raw material drying time TB, and preset preparation time TC. The TC preparation time is as close as possible to the actual weighing time of the weighing mixer and the conveying time of the feeding machine. S2. When the system waits for the first feeding preparation time point td, the system controls the weighing and mixing machine to accurately weigh the raw materials and secondary materials according to the preset hourly raw material usage W1 and the percentage of secondary materials. The weighed mass is W1. After being mixed evenly, the materials fall into the suction box. The suction box is equipped with a low material level switch to detect the storage status of raw materials in the suction box. S3. The system controls the feeder to transport the mixed raw materials weighed according to the proportion in the suction box of the weighing mixer to the material barrel of the dryer through the pipeline and the suction hopper. The low material level switch of the suction box of the weighing mixer confirms that the raw materials have been sucked out. S4. After the system waits until the start drying time point te, the system controls the dryer to start drying the raw material. S5. The system waits for the next feeding time point, which is td + n hours, where n is a natural number less than or equal to TB, and TB can be an integer or contain decimals; S6. After the next feeding time point arrives, continue to repeat S2 and S3 above until the feeding action of the raw material for the integer part of TB+1 times is completed. The mass of the last feeding is the fractional part of TB multiplied by W1. When the last feeding is completed, the system should detect that the full material signal becomes valid after the feeding through the high material level switch arranged in the dryer. S7. After the system waits for the injection molding machine to start production at time ta, it sends a raw material drying OK signal to the injection molding machine. S8. The system continuously monitors the injection molding production time and the high-level switch located in the dryer. Each time, when the injection molding production time is not less than 1 hour and the high-level switch detects that the raw material in the barrel is lower than the material level, the system controls the weighing and mixing machine to accurately weigh the raw material and the secondary material according to the preset hourly raw material consumption W1 and the percentage of secondary material. The weighed mass is W1. After being mixed evenly, it falls into the suction box. The suction box is equipped with a low-level switch to detect the storage status of the raw material in the suction box. S9. The system controls the feeder to transport the proportionally weighed mixed raw materials in the weighing mixer's suction box to the dryer's material hopper. The low material level switch of the weighing mixer's suction box confirms that the raw materials have been sucked out.

[0015] When the injection molding production task needs to be temporarily interrupted for more than 20 minutes due to special reasons, the control system can be manually switched to the pause mode. After entering the mode, the system will automatically record the time TF of entering the mode, and automatically lower the drying temperature setting of the dryer by 5 degrees to continue drying operation. Then the system enters the standby state of the pause mode.

[0016] When injection molding production needs to resume, you can try switching to continuous production mode by canceling the pause. The system will first automatically restore the dryer's set drying temperature, and then compare the pause time TF with the preset allowable pause time TG (generally TG < 2 hours). Based on the result, it will determine whether to switch to continuous production mode: When TF does not exceed TG, the system will automatically calculate and pop up a window asking the operator to confirm the release of the material mass W2 that has been drying for too long in the drying drum, W2 = 50% * W1 * TF. After the operator releases an equal mass of material and confirms the operation, the system switches to continuous production mode and sets the current injection molding production time to 50% * TF, and continues to repeat the steps in S8 above; When TF exceeds TG, the system will determine that production cannot be resumed due to the excessive pause time, and all the material in the dryer needs to be released, and then it will restart from S1.

[0017] This invention automatically calculates the initial feeding preparation time td and the start drying time te by using preset injection molding machine start-up time ta, raw material hourly consumption W1, raw material drying time TB, and preset preparation time TC. It accurately weighs raw materials and secondary materials according to preset percentages, weighs the amount W1 for one hour, and operates automatically according to a prescribed feeding strategy. This design ensures that the injection molding machine starts production immediately when it reaches the preset injection molding machine start-up time ta. Furthermore, considering situations where injection molding production needs to be temporarily interrupted for more than 20 minutes due to special reasons, the system has a pause mode. When canceling the pause and preparing to resume production, it automatically determines whether continuous production mode can be resumed and provides relevant processing suggestions.

[0018] The intelligent control and accurate prompts of this invention guide operators to strictly manage raw material drying, effectively preventing over-drying due to excessive drying time or under-drying due to insufficient drying time. This ensures that the plastic raw materials in the injection molding machine are in optimal processing condition, thereby guaranteeing the quality of injection molded products, reducing defect rates, minimizing material waste, and improving production efficiency. Simultaneously, precise control and automated operation reduce labor intensity, minimize human error and material waste during production, and provide reliable assurance and support for production.

[0019] In the description of this invention, 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 generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention 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 invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0020] 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.

[0021] 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 should not be construed as limiting the scope of protection of this invention.

[0022] The control method of the intelligent quantitative feeding and drying system provided in this application has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A control method for an intelligent quantitative feeding and drying system, characterized in that: The control method includes the following steps: S1. The system calculates the initial feeding preparation time td=ta-TB-TC and the start drying time te=ta-TB based on the customer's preset injection molding machine start-up production time ta, raw material drying time TB, and preset preparation time TC. S2. When the system waits for the first feeding preparation time point td, the system controls the weighing and mixing machine to accurately weigh the raw materials and secondary materials according to the preset hourly raw material usage W1 and the percentage of secondary materials. The weighed mass is W1. After being mixed evenly, the materials fall into the suction box. The suction box is equipped with a low material level switch to detect the storage status of raw materials in the suction box. S3. The system controls the feeder to transport the mixed raw materials weighed according to the proportion in the suction box of the weighing mixer to the material barrel of the dryer through the pipeline and the suction hopper. The low material level switch of the suction box of the weighing mixer confirms that the raw materials have been sucked out. S4. After the system waits until the start drying time point te, the system controls the dryer to start drying the raw material. S5. The system waits for the next feeding time point, which is td + n hours, where n is a natural number less than or equal to TB, and TB can be an integer or contain decimals; S6. After the next feeding time point arrives, continue to repeat S2 and S3 above until the feeding action of the raw material for the integer part of TB+1 times is completed. The mass of the last feeding is the fractional part of TB multiplied by W1. When the last feeding is completed, the system should detect that the full material signal becomes valid after the feeding through the high material level switch arranged in the dryer. S7. After the system waits for the injection molding machine to start production at time ta, it sends a raw material drying OK signal to the injection molding machine. S8. The system continuously monitors the injection molding production time and the high-level switch located in the dryer. Each time, when the injection molding production time is not less than 1 hour and the high-level switch detects that the raw material in the barrel is lower than the material level, the system controls the weighing and mixing machine to accurately weigh the raw material and the secondary material according to the preset hourly raw material consumption W1 and the percentage of secondary material. The weighed mass is W1. After being mixed evenly, it falls into the suction box. The suction box is equipped with a low-level switch to detect the storage status of the raw material in the suction box. S9. The system controls the feeder to transport the proportionally weighed mixed raw materials in the weighing mixer's suction box to the dryer's material hopper. The low material level switch of the weighing mixer's suction box confirms that the raw materials have been sucked out.

2. The control method for an intelligent quantitative feeding and drying system according to claim 1, characterized in that: The TC preparation time is equal to the total time for the actual completion of a single weighing and mixing machine weighing and feeding machine conveying.

3. The control method for an intelligent quantitative feeding and drying system according to claim 1, characterized in that: When the injection molding production task needs to be temporarily interrupted for more than 20 minutes due to special reasons, the control system can be manually switched to the pause mode. After entering the mode, the system will automatically record the time TF of entering the mode, and automatically lower the drying temperature setting of the dryer by 5 degrees to continue drying operation. Then the system enters the standby state of the pause mode.

4. The control method for an intelligent quantitative feeding and drying system according to claim 3, characterized in that: When injection molding production needs to resume, the system can attempt to switch to continuous production mode by canceling the pause. The system will first automatically restore the dryer's set drying temperature, and then compare the pause time TF with the preset allowable pause time TG. Based on the result, the system will determine whether to switch to continuous production mode: If TF does not exceed TG, the system will automatically calculate and display a pop-up window asking the operator to confirm the release of the material mass W2 that has been drying for too long in the drying drum. W2 = 50% * W1 * TF. After the operator releases an equal mass of material and confirms the operation, the system will switch to continuous production mode and set the current injection molding production time to 50% * TF, and continue repeating the steps in S8 above. If TF exceeds TG, the system will determine that production cannot be resumed due to the excessive pause time, and all materials in the dryer need to be released. Then, the system will restart from S1.

5. The control method for an intelligent quantitative feeding and drying system according to claim 4, characterized in that: The TG is less than 2 hours.

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