A control method and system for a double-station top-and-bottom box production equipment

Abstract

The application discloses a kind of double-station heaven and earth box production equipment control method and system, relating to packaging product processing equipment control technical field, comprising the following steps: in the boundary area of double-station heaven and earth box production equipment station, dynamic occupancy description band is established, semi-finished product enters moment, leave moment and stay increment are recorded continuously, boundary occupancy state string is generated, and occupancy threshold line is output according to boundary occupancy state string.The application realizes the flexible coordination of feeding, conveying and pressing action by dynamic occupancy description and frequency pulse giving way control, and the semi-finished product can be guided to leave the boundary area by rhythm, preventing congestion and overload.Through the timing integration of turn-back trigger window, high-force action and giving way process are dynamically staggered, energy transfer is balanced, mold deformation is avoided, and the stability and forming precision of the equipment under continuous high-load operation are ensured.

Description

Technical Field

[0001] This invention relates to the field of control technology for packaging product processing equipment, specifically to a control method and system for a dual-station box production equipment. Background Technology

[0002] A top-and-bottom box is a common high-end packaging box structure, consisting of two parts: the top cover (called the top box) and the bottom cover (called the bottom box). These parts fit together to form a closed box, commonly used for high-end gift boxes and electronic product boxes. The dual-station top-and-bottom box production equipment is controlled based on the centralized scheduling logic of an industrial control system. Through precise control of two independent but collaborative processing stations, it achieves time-sharing parallelism and rhythm coordination of processes such as gray board slotting and folding, face paper lamination, positioning and pressing, and box forming and unpacking. The industrial control system undertakes core tasks such as signal acquisition, action command allocation, and execution feedback management, enabling the motion mechanism, conveying mechanism, and pasting unit to operate synchronously under a unified control framework. Thus, while the top box is being processed at the upper station, the bottom box can be formed simultaneously at the lower station. Through signal interaction and rhythm optimization, continuous and high-efficiency control of the equipment operation is achieved.

[0003] The existing technology has the following shortcomings: In the control process of existing dual-station top and bottom box production equipment, when the production cycle is dynamically adjusted according to the process status, there are transient changes in the station switching sequence, pushing speed, and arrival determination. This can easily lead to unplanned brief pauses of a single top and bottom box semi-finished product in the boundary area of ​​adjacent stations. Since this pause time is short and does not exceed the abnormal identification threshold preset by the control system, the control logic in the existing technology usually still determines that the boundary area of ​​the station is in a feedable state. In subsequent operating cycles, new gray boards continue to be conveyed into this area, thus overlapping and contacting the already stuck semi-finished product in a limited space. Under the action of continuous pushing and forming actions, a stacked and compacted state is gradually formed. As the degree of stacked compaction continues to accumulate, abnormal forces are continuously transmitted to the forming mold and its guiding structure, which can easily cause local plastic deformation of the mold or displacement of the reference position, resulting in an irreversible decrease in the forming accuracy of the equipment, or even permanent damage to the mold, seriously affecting the long-term stable operation of the top and bottom box production equipment.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a control method and system for a dual-station top and bottom box production equipment to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a control method for a dual-station top and bottom box production equipment, comprising the following steps: A dynamic occupancy tracking band is established in the work station boundary area of ​​the dual-station top and bottom box production equipment to continuously record the entry time, exit time and dwell increment of the semi-finished product, generate the boundary occupancy status string, and output the occupancy threshold line based on the boundary occupancy status string. Based on the occupancy threshold, the feeding push command is controlled by boundary clearance lock. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. According to the clearance list, the front-stage conveying mechanism is driven to perform breathing-type micro-yield traction, and the gray board is retracted in micro-steps according to the rhythm of the clearance list. After the retraction is completed, the arrival sequence of the gray board is rearranged to generate a sequence write-back mark. Based on the sequence write-back identifier, the phase foldback compression is performed on the dual-station switching timing to align the trigger point of the pressing action with the closed edge of the clearance gap, and the foldback trigger window is output. Based on the reversal trigger window, the station boundary area is controlled by misfrequency pulse yielding. Within the reversal trigger window, the alternating switching of micro-push amplitude limiting control, micro-retraction gain control, and compaction delay control is executed in sequence. The semi-finished products that are stuck in the boundary area are rhythmically pulled away from the boundary area, thereby blocking the formation of the stacked compaction chain.

[0007] Preferably, the step for outputting the placeholder threshold is as follows: In the work station boundary area of ​​the dual-station top and bottom box production equipment, a monitoring range of dynamic occupancy marking band is set, and the monitoring range is set to cover the transition zone between adjacent work stations, so as to continuously identify semi-finished products in the transition zone. After recording the entry time of the semi-finished product, the movement status of the semi-finished product within the workstation boundary area is continuously tracked. When the semi-finished product leaves the workstation boundary area, the departure time is recorded, and the dwell increment is determined based on the time difference between the entry time and the departure time. After obtaining the entry time, exit time, and dwell increment of multiple semi-finished products, they are combined in chronological order to form a boundary occupancy status string, and the degree of congestion in the workstation boundary area is reflected based on the occupancy status string. After generating the boundary occupancy status string, the cumulative change of the dwell increment is analyzed, and the occupancy threshold line is output to represent the critical state of material feeding in the station boundary area. The occupancy threshold line is used to guide the opening or freezing of the feeding push command.

[0008] Preferably, when outputting the occupancy threshold, the cumulative proportion of the dwell increment in the boundary occupancy status string is dynamically compared to convert the cumulative proportion of the dwell increment into threshold information reflecting the real-time occupancy trend of the workstation boundary area. The threshold information is then output to the feeding control unit to trigger the feeding freeze command in advance when the workstation boundary area approaches the critical occupancy state, thereby realizing dynamic regulation of the feeding push action and boundary safety occupancy control.

[0009] Preferably, the steps for boundary clearance lock control of the feeding push command based on the occupancy threshold are as follows: After obtaining the occupancy threshold line output by the dynamic occupancy tracing tape, the occupancy threshold line is used as the dynamic boundary reference for feeding and pushing. The feeding control unit monitors the occupancy trend change of the station boundary area according to the relationship between the occupancy threshold line and the boundary occupancy status string. When the occupancy status reaches the occupancy threshold line, the feeding and pushing command is frozen. After the feeding push command is frozen, the feeding control unit initiates the clearance release operation based on the occupancy status string data at the time of freezing, and slowly retracts the front conveyor mechanism in a micro-intermittent manner to release the space margin. After the clearance is released, the feeding control unit generates a corresponding clearance list based on the difference between the occupancy status string before and after freezing, which is used to record the spatial distribution and clearance changes. After generating the clearance list, the feed control unit performs dynamic preprocessing on the frozen state based on the clearance list. When the frozen state drops below the clearance threshold, the frozen state is released and the triggering of the feed push command is restored.

[0010] Preferably, after the feeding push command is frozen, the feeding control unit performs a phased slow retreat action during the release of the clearance gap according to the changing trend of the occupancy threshold line, so that the released space margin and the occupancy increment of the boundary area maintain a proportional correspondence. Before the freeze is lifted, the recovery time of the feeding push is adjusted according to the rhythm of the clearance gap list to ensure the synchronous and continuous release rhythm of the feeding push action and the boundary area.

[0011] Preferably, the steps for driving the front-stage conveying mechanism to perform breathing-type micro-yield traction based on the clearance list are as follows: After generating the clearance list, the feed control device drives the front conveyor to perform breathing micro-yield traction according to the time sequence of the clearance list, so that the conveyor starts micro-step adjustment according to the clearance rhythm recorded in the list; When performing breathing-type micro-yield traction, the feeding control device performs micro-step retraction of the gray board according to the rhythm of the yield gap list, so that the semi-finished products in the boundary area produce continuous yielding movement under rhythmic traction. After completing the micro-step retraction, the feeding control device rearranges the arrival sequence of the gray boards according to their positions after retraction, so that the arrangement order of each gray board in the conveying direction corresponds to the gap rhythm. After the sequence is rearranged, the feeding control device generates a sequence write-back identifier based on the rearranged gray board position, which is used to record the arrival sequence information of each gray board after the retraction and adjustment.

[0012] Preferably, the steps for performing phase foldback compression on the dual-station switching timing based on the sequence bit write-back identifier are as follows: After obtaining the sequence write-back identifier generated by the breathing micro-retreat traction process, the dual-station control logic uses the sequence write-back identifier as a time reference for switching timing adjustment and adjusts the station switching phase according to the sequence write-back identifier. After determining the offset relationship between the sequence write-back flag and the workstation switching phase, the dual-workstation control logic starts the phase foldback compression process. By adjusting the workstation timing through reverse compression, the workstation switching action can be synchronized with the sequence write-back flag. After the phase foldback compression is completed, the dual-station control logic uses the closed edge of the clearance gap as the key reference for timing alignment to reposition the trigger point of the pressing action, so that the pressing action is precisely aligned with the closed edge. After the pressing action trigger point and the closing edge are aligned, the dual-station control logic outputs a foldback trigger window to limit the execution range of the pressing action and provide a time reference for subsequent mis-frequency pulse yielding control.

[0013] Preferably, during the phase foldback compression process, the dual-station control logic dynamically adjusts the trigger time of the pressing action based on the sequential data of the sequence bit write-back identifier to ensure that the start time of the pressing action is aligned with the end time of the closing edge, and outputs the foldback trigger window after the trigger point is aligned, further optimizing the time synchronization during the station switching process.

[0014] Preferably, the steps for adjusting the frequency shift pulse clearance of the workstation boundary area based on the return trigger window are as follows: After the return trigger window is output, the dual-station control logic uses the time range of the return trigger window as the execution cycle of the frequency error pulse yield control, and applies micro-push limiting control to the front conveyor mechanism in the initial stage of the return trigger window, so that the semi-finished product moves forward in a controlled manner within the boundary area. After completing the micro-push limiting control, the dual-station control logic performs micro-retraction gain control in the middle time interval of the turnaround trigger window, forming a breathing-like movement rhythm of the semi-finished product through reverse micro-traction. After the micro-retraction gain control is completed, the dual-station control logic performs pressing delay control in the later time interval of the turnaround trigger window, so that the pressing action starts after the space clearance is completely closed. At the end of the turnaround trigger window, the dual-station control logic combines the execution results of micro-push limiting control, micro-retraction gain control, and compression delay control in a timing sequence, so that the mis-frequency pulse yielding control forms a closed-loop rhythm.

[0015] A control system for a dual-station top-and-bottom box production equipment includes a dynamic occupancy monitoring module, a boundary clearance locking module, a breathing clearance traction module, a phase foldback pressure control module, and a frequency misalignment clearance adjustment module. The dynamic occupancy monitoring module establishes a dynamic occupancy recording band in the work station boundary area of ​​the dual-station top and bottom box production equipment, continuously records the entry time, exit time and dwell increment of the semi-finished product, generates a boundary occupancy status string, and outputs the occupancy threshold line based on the boundary occupancy status string. The boundary clearance lock control module controls the feeding push command based on the occupancy threshold. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. The breathing yielding traction module drives the front-stage conveying mechanism to perform breathing micro-yielding traction according to the yielding gap list. It performs micro-step retraction of the gray board according to the rhythm of the yielding gap list, and rearranges the arrival sequence of the gray board after the retraction is completed, generating a sequence write-back identifier. The phase foldback pressure control module performs phase foldback compression on the dual-station switching timing according to the sequence write-back identifier, aligns the trigger point of the pressing action with the closed edge of the clearance gap, and outputs the foldback trigger window; The frequency misalignment control module performs frequency misalignment pulse control on the boundary area of ​​the workstation based on the return trigger window. Within the return trigger window, it sequentially performs alternating switching of micro-push amplitude limiting control, micro-retraction gain control, and compaction delay control, thereby rhythmically pulling the stagnant semi-finished products away from the boundary area and thus blocking the formation of the stacked compaction chain.

[0016] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention introduces dynamic occupancy tracking and frequency-shifting pulse yielding control into the workstation boundary areas of a dual-station top-and-bottom box production line, enabling a flexible and coordinated relationship between feeding, conveying, and pressing actions in time. When the production cycle shifts transiently due to process changes, the occupancy status of the workstation boundary areas can be identified in real time and actively triggered to activate yielding lock control. This allows the stalled semi-finished products to be smoothly guided away from the stacking area under rhythmic guidance, avoiding conveyor blockages and mold overload caused by brief stops. Through this rhythmic adaptive control, the production line's operating cycle remains continuous, the impact load during equipment movement is reduced, and the overall operational stability and molding accuracy are improved.

[0017] This invention integrates the timing of pushing, retraction, and pressing actions within the reversal trigger window, enabling dynamic staggered execution of high-force actions and spatial clearance processes, fundamentally preventing the formation of a semi-finished product stacking and compaction chain. This time allocation method ensures more balanced energy transfer at the station boundary areas, maintaining consistent stress on the semi-finished product during conveying and forming processes, effectively preventing cumulative deformation of the mold and guide structure. This control method ensures stable cycle time even under high-load continuous operation of the dual stations, improving the long-term operational reliability and forming quality stability of the equipment. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a flowchart of a method for controlling a dual-station top and bottom box production equipment according to the present invention.

[0020] Figure 2 This is a schematic diagram of a module control system for a dual-station top and bottom box production equipment according to the present invention. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0022] This invention provides, for example Figure 1 The control method for a dual-station top and bottom box production equipment shown includes the following steps: A dynamic occupancy tracking band is established in the work station boundary area of ​​the dual-station top and bottom box production equipment to continuously record the entry time, exit time and dwell increment of the semi-finished product, generate the boundary occupancy status string, and output the occupancy threshold line based on the boundary occupancy status string. A dynamic occupancy tracking strip is established in the workstation boundary area of ​​the dual-station top-bottom box production equipment. This strip is used to continuously monitor and identify the movement status of semi-finished products within the workstation boundary area. By continuously recording the entry time, exit time, and dwell time increment of the semi-finished products, a boundary occupancy status string is generated. Based on this boundary occupancy status string, an occupancy threshold line is output, thus providing a dynamic boundary determination basis for subsequent material feeding and pushing control. The specific steps are as follows: A monitoring range for a dynamic occupancy tracking tape is established in the workstation boundary area of ​​the dual-station top-bottom box production equipment. This monitoring range is designed to cover the transition zone between adjacent workstations, ensuring continuous identification of each semi-finished product within this transition zone. By dividing the spatial range of the workstation boundary area, the start and end positions and scanning intervals of the dynamic occupancy tracking tape are determined, enabling the tape to form a continuous occupancy recording trajectory throughout the entire boundary area. The dynamic occupancy tracking tape continuously senses the movement trajectory of semi-finished products during production, capturing the real-time entry time of each product into the workstation boundary area. Whenever a new semi-finished product enters the boundary area from the preceding conveyor channel, the dynamic occupancy tracking tape immediately records its entry time and associates this entry time with the current workstation's time sequence based on the actual operating cycle of the workstation conveyor mechanism, forming an occupancy start record synchronized with the cycle. In this way, an occupancy time baseline synchronized with the dual-station cycle can be established in the boundary area to guide subsequent dwell time calculations and occupancy trend identification.

[0023] After obtaining the entry time of the semi-finished product, the dynamic occupancy tracking tape continues to track the movement of the semi-finished product within the boundary area and records the departure time when the semi-finished product completely leaves the area. The dwell time of the semi-finished product within the workstation boundary area is determined by the time difference between the entry and departure times. To obtain more stable boundary occupancy information, the dynamic occupancy tracking tape updates its records continuously throughout the entire operation, allowing adjacent records to reflect the movement and dwell trends of the semi-finished product within the boundary area. When the semi-finished product experiences a brief pause or speed change, the dynamic occupancy tracking tape calculates the dwell increment based on the delay of the departure time, thus transforming a single dwelling phenomenon into a continuous dwell increase. This dwell increment is recorded in the dwell time series, serving as the basic unit for constructing the boundary dwell state string. In this way, the dynamic occupancy tracking tape not only records discrete events of single entry and exit but also forms a continuous dwell change trajectory, enabling the dwell state of each semi-finished product to be fully represented in the boundary area in the form of time accumulation.

[0024] After acquiring the entry and exit times of multiple semi-finished products and their corresponding dwell increments, the dynamic occupancy tracking tape combines these data in chronological order to form a boundary occupancy status string. The boundary occupancy status string is a dynamic sequence composed of multiple sets of continuous dwell increments, used to reflect the congestion level and occupancy trend of the workstation boundary area within a certain time range. When the dwell behavior of multiple semi-finished products in the boundary area overlaps or continuously increases, the occupancy data of the corresponding segment in the boundary occupancy status string will form a cumulative peak. The dynamic occupancy tracking tape judges the congestion status of the workstation boundary area based on the rate of change of these peaks. To ensure that the occupancy status string can accurately reflect the occupancy load under the production cycle, the dynamic occupancy tracking tape performs time correlation processing on each entry and exit event during recording, making the conveying cycle, dwell cycle, and occupancy status between adjacent workstations form a unified time reference. The generation process of the boundary occupancy status string includes not only static recording but also dynamic continuity maintenance, enabling the occupancy status to remain continuously traceable when the production cycle of two workstations changes. By establishing this state string, the dual-station top and bottom box production equipment can monitor the distribution and changing trends of semi-finished products in the boundary area in real time without additional pauses, providing continuous boundary data support for subsequent material feeding and pushing logic.

[0025] Based on the generated boundary occupancy state string, the dynamic occupancy tracing tape analyzes the cumulative changes in dwell increments within the state string and outputs the corresponding occupancy threshold. The occupancy threshold represents the critical state of the boundary area that can be fed. Its formation process is as follows: when the cumulative dwell increment in the boundary occupancy state string reaches a preset capacity critical ratio, the dynamic occupancy tracing tape converts this critical ratio into a threshold information reflecting the current occupancy trend. This threshold is dynamically output to the equipment control unit to guide the initiation or freezing of subsequent feeding commands. When the occupancy trend in the boundary area continues to rise and approaches the occupancy threshold, the control unit can enter the yielding adjustment stage in advance, thereby avoiding the accumulation of semi-finished products. Conversely, when the occupancy trend declines and moves away from the occupancy threshold, the equipment control unit can automatically resume feeding, keeping the production process continuous. In this way, the dynamic occupancy recording tape not only continuously records the entry time, exit time, and dwell increment of the semi-finished product, but also generates a boundary occupancy status serial-parallel output occupancy threshold line, realizing the dynamic coupling between the boundary occupancy status and the feeding cycle. This ensures that the station boundary area is always maintained within a safe and controllable occupancy status range during cycle changes, thereby providing accurate judgment basis for subsequent boundary clearance lock control and ensuring the stable operation and continuous forming of the dual-station top and bottom box production equipment under high-speed cycle.

[0026] Based on the occupancy threshold, the feeding push command is controlled by boundary clearance lock. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. Based on the occupancy threshold, boundary clearance lock control is applied to the feeding push command. By introducing a dynamic freeze and release mechanism into the feeding control process of the dual-station top-bottom box production equipment, the feeding push action can be coordinated and adjusted according to the real-time occupancy status of the station boundary area. This prevents new semi-finished products from entering the boundary congestion area without disrupting the overall cycle continuity. The specific steps are as follows: After obtaining the occupancy threshold line output by the dynamic occupancy recording tape, this threshold line is used as the dynamic boundary reference for material feeding. The feeding control unit monitors the occupancy trend changes in the workstation boundary area in real time based on the relationship between the occupancy threshold line and the boundary occupancy status string. When the dwell increment data of the boundary occupancy status string approaches or reaches the occupancy threshold line, the feeding control unit immediately activates the boundary clearance lock control logic, determining that the area is near saturation. In this state, the material feeding command is no longer triggered conventionally based on a fixed cycle, but is constrained by the real-time occupancy threshold line. When the occupancy status of the boundary area is detected to have reached the critical threshold line, the triggering condition for the material feeding command is automatically frozen, and the frozen state is maintained by the control unit until sufficient space is released in the boundary area. Through this process, the equipment can prevent new feeding actions from occurring before semi-finished products accumulate, preventing the accumulation of semi-finished products at the boundary due to transient changes in the workstation switching sequence.

[0027] After the feed push command is frozen, to prevent the entire conveyor chain from accumulating in the preceding conveyor due to freezing, the feed control unit initiates a clearance release operation based on the occupancy status string data at the time of freezing. This operation analyzes the occupancy distribution at the time of freezing, calculates the space margin between the workstation boundary area and the preceding conveyor area, and then generates a clearance that can be used for feed adjustment. During the release process, the feed control unit controls the preceding conveyor mechanism to slowly retreat in a micro-intermittent manner, relieving the pressure in the workstation boundary area and creating temporary buffer space for the redistribution of subsequent semi-finished products. The clearance release process is a dynamic process with the occupancy threshold as a reference. The release amount is not a fixed value, but is proportional to the cumulative change in the dwell increment in the occupancy status string at the time of freezing. Through this dynamic clearance operation, it is ensured that the boundary area will not experience movement impact due to sudden stops, and that the space redistribution capability is still available in the frozen state, thereby maintaining the flexible adjustment capability of the production cycle in continuous operation.

[0028] After the clearance gap is successfully released, the feeding control unit records the gap distribution formed during the release process in chronological order, generating a corresponding clearance gap list. This clearance gap list details the changes in available space in the boundary area and upstream conveying channel before and after the freezing point, including the time of generation of each gap, the gap width, and the time position of the corresponding conveying section. The clearance gap list guides subsequent breathing-style micro-yield traction operations, providing spatial reference for subsequent micro-step adjustments of the gray board. The process of generating the clearance gap list is not merely static recording, but rather involves analyzing the difference between the occupancy state strings before and after freezing to form a continuous gap sequence information, enabling the control unit to execute according to the gap rhythm when resuming feeding. Through the establishment of the clearance gap list, the feeding logic that was originally stopped due to freezing gains a recoverable timing reference, ensuring that the equipment does not lose the continuity of production rhythm during freezing and can immediately resume feeding after the boundary state falls back to the safe zone, maintaining the synchronous rhythm between the two workstations.

[0029] Before the freeze is lifted, the feeding control unit dynamically preprocesses the feeding push status based on the generated clearance list, ensuring a smooth transition between freezing and release. When the occupancy status string in the boundary area drops below the occupancy threshold, the feeding control unit automatically unfreezes the system and uses the clearance formed in the previous stage as a time compensation window for resuming feeding, ensuring that the new feeding push command perfectly matches the release rhythm of the boundary area in both space and time. Through this boundary clearance lock control method, the feeding push command no longer depends on the mechanical cycle time but is dynamically allocated based on the real-time status of the occupancy threshold, thus achieving flexible synchronization of the boundary area during parallel operation of two workstations. When the production cycle time changes, this method can proactively freeze the feeding before the semi-finished products physically overlap, and automatically adjust the conveying sequence between the preceding and following workstations by releasing and reusing the clearance list, avoiding temporary blockages or pressure phenomena in the workstation boundary areas.

[0030] According to the clearance list, the front-stage conveying mechanism is driven to perform breathing-type micro-yield traction, and the gray board is retracted in micro-steps according to the rhythm of the clearance list. After the retraction is completed, the arrival sequence of the gray board is rearranged to generate a sequence write-back mark. Based on the occupancy threshold, boundary clearance lock control is applied to the feeding push command. By introducing a dynamic freeze and release collaborative control mechanism in the feeding scheduling process of the dual-station top-bottom box production equipment, the feeding push action no longer relies solely on a fixed cycle time, but adaptively adjusts according to the real-time occupancy status changes of the station boundary area. This effectively prevents the overlapping contact phenomenon of semi-finished products between adjacent stations due to transient cycle time misalignment. The specific steps are as follows: After the dynamic occupancy tracking tape outputs the occupancy threshold, the feeding control device establishes the initial judgment conditions for the boundary clearance lock based on this threshold. The boundary clearance lock uses the occupancy threshold as the trigger reference, continuously comparing the state relationship between the boundary occupancy status string and the threshold to determine the allowable range of the feeding push command. When the dwell increment data of the boundary occupancy status string is within the normal fluctuation range, the feeding push command is still triggered normally according to the production rhythm; when the cumulative occupancy trend of the boundary occupancy status string approaches the threshold, the boundary clearance lock enters a pre-locked state, synchronously listening to the trigger signal of the feeding push action to prevent the command from being excessively pre-empted. When the boundary occupancy status string continues to grow and reaches the threshold, the boundary clearance lock immediately switches to a locked state, freezing the feeding push command in the locked state to prevent new gray board material from being pushed to the workstation boundary area. Through this threshold-based dynamic locking method, the feeding push action and the workstation boundary occupancy status form a real-time coupling relationship, ensuring consistency between the freezing behavior and the occurrence of occupancy congestion at the control logic level.

[0031] After the feeding push command is frozen, to prevent localized congestion in the conveyor channel caused by the freezing action, the feeding control device initiates a clearance release process using the occupancy status data at the time of freezing. The clearance release starts from the frozen state and gradually releases a buffer zone for subsequent adjustments based on the arrangement of semi-finished products within the workstation boundary area and their spatial connection with the preceding conveyor channel. This release process gradually reduces the load on the frozen boundary by precisely controlling the minute clearance movements of the conveyor mechanism. The clearance release is not a one-time action but rather multiple, continuous small releases based on the cumulative changes in the occupancy status string over time, creating a segmented spatial clearance effect. Each release uses the occupancy threshold as a reference; when the occupancy trend in the frozen state begins to decline, the feeding control device automatically extends the clearance release amount, gradually restoring the boundary area to a low occupancy state. Through this process, the boundary area in the frozen state can achieve controlled spatial redistribution, thereby releasing localized congestion pressure without affecting the overall conveying rhythm.

[0032] After the clearance gaps are released, the feeding control device generates a corresponding clearance gap list based on the state change data before, during, and after freezing. This clearance gap list records the start position, end position, and duration of each gap formed during the freezing process in chronological order, characterizing the spatial distribution pattern after the freeze is lifted. The generation process of the clearance gap list starts with the trigger point of the freezing action and ends with the completion time of the last clearance gap release, ensuring complete continuity of the entire freezing and release process in the time dimension. The clearance gap list includes: the occupancy status string data at the freezing moment, the gap growth during the release cycle, and the remaining occupancy segment after the freeze is lifted. Through this list, the feeding control device can quantitatively describe the empty area formed during freezing, thereby accurately corresponding the feeding start time with the spatial window formed by the release when feeding resumes. In this way, the new semi-finished product feeding action will no longer overlap with the stagnant semi-finished products, and the feeding rhythm can naturally transition to the safe state after the boundary clearance.

[0033] Once the clearance list is generated, the feeding control device prepares to unlock the frozen state based on the list, ensuring a smooth resumption of the feeding action when spatial conditions are met. The unlocking process is strictly controlled by real-time comparison between the occupancy threshold and the boundary occupancy status sequence. When the occupancy status of the boundary area drops below the occupancy threshold, the feeding control device automatically releases the boundary clearance lock and restarts the feeding command according to the clearance rhythm in the clearance list. The first feeding action after unlocking targets the earliest released clearance in the list, ensuring that the arrival time of new gray board material in the station boundary area perfectly matches the spatial rhythm of the previous stage. Through this continuous freeze-release-unlock control method, the feeding action transforms from a single-cycle driven mechanism to a dynamic driven mechanism based on occupancy status, enabling the feeding rhythm to form a closed-loop coordination relationship with the actual occupancy of the station boundary. Therefore, during the dynamic adjustment of the production cycle, even if there are transient changes in the workstation switching sequence or pushing speed, the equipment can achieve adaptive adjustment of the feeding through the boundary clearance lock control mechanism, effectively preventing the semi-finished products from overlapping and contacting in the workstation boundary area, and continuously maintaining the smoothness and stability of the conveyor chain during the production process.

[0034] Based on the sequence write-back identifier, the phase foldback compression is performed on the dual-station switching timing to align the trigger point of the pressing action with the closed edge of the clearance gap, and the foldback trigger window is output. Based on the sequence write-back identifier, phase foldback compression is implemented for the dual-station switching sequence. By introducing a dynamic foldback adjustment mechanism in the phase domain into the dual-station control process of the top and bottom box production equipment, the action trigger time of the two stations during the switching process can be accurately reconstructed according to the sequence write-back identifier of the previous stage. This achieves automatic alignment between the pressing action trigger point and the closing edge of the clearance gap. Furthermore, a foldback trigger window is output to ensure the coordinated stability of the station switching sequence and the synchronous accuracy of the pressing action. The specific steps are as follows: After obtaining the sequence write-back identifier generated by the breathing-type micro-yield traction process, the dual-station control logic uses this sequence write-back identifier as a time reference for switching timing adjustment. The sequence write-back identifier records the final arrival sequence information of each gray board after the yield gap adjustment is completed, as well as its synchronization status with the station's action cycle. By introducing the sequence write-back identifier, the timing coordination between the two stations no longer relies on fixed cycle parameters, but is dynamically adjusted based on the updated results of the actual conveying sequence. The dual-station control logic first reads the current station's operating status, including the pressing unit's action cycle, rise and fall times, and the feeding delay of the conveying channel, and compares these operating statuses with the time segments corresponding to the sequence write-back identifier. When a deviation is detected between the station's action time and the sequence write-back identifier, the control logic reconstructs the station switching phase at the time reference level, providing a time reference basis for subsequent phase foldback compression. In this way, the switching of the two stations is no longer an independent periodic behavior, but is based on the actual arrival sequence of the semi-finished product, achieving linked adjustment on the time axis.

[0035] After determining the offset relationship between the sequence write-back flag and the workstation switching phase, the dual-workstation control logic initiates the phase reversal compression process. This process uses the current dual-workstation action time curve as a benchmark, selecting the pressing action with the largest phase difference as the target segment for reversal adjustment. The core of phase reversal compression lies in reverse compression of the time gaps existing in the workstation switching sequence, causing the passive waiting period to be folded back to the effective action stage, thereby achieving a redistribution of timing without changing the total cycle time. During implementation, the control logic adjusts the trigger phase of each action based on the sequence data of the sequence write-back flag, ensuring that the magnitude of phase forward or backward shifts matches the actual lag of the gray board sequence. By reversing the switching cycle of the two workstations, the originally separated action trigger points are brought closer together, preventing the pressing unit from moving earlier or later due to asynchronous timing between the preceding and following workstations. This ensures that the dual-workstations maintain consistency between the pressing action and the conveying rhythm under dynamic cycle time.

[0036] After the phase-reversal compression is completed, the dual-station control logic uses the closed edge of the clearance gap as a key reference for timing alignment, repositioning the trigger point of the pressing action to the closed edge. The closed edge of the clearance gap represents the moment when the spatial adjustment of the previous stage is completed, and it is also the node when the boundary area is ready for feeding again. By aligning the trigger point of the pressing action with this edge, the pressing action can begin when the boundary area is completely cleared and the semi-finished product is stably positioned, thus avoiding uneven force on the semi-finished product or material clamping caused by premature pressing before the clearance is completed. The alignment process includes two levels: first, synchronization at the time level, keeping the trigger time of the pressing action consistent with the end time of the closed edge; second, connection at the spatial level, precisely corresponding the pressing path of the pressing action with the semi-finished product position corresponding to the closed edge, so that the direction of the pressing force is consistent with the positioning direction of the semi-finished product. Through dual alignment of time and space, the pressing action can be started in the most suitable window, thereby improving the stability and repeatability of molding without affecting the overall cycle time of the dual-station system.

[0037] After the trigger point of the pressing action aligns with the closing edge of the clearance gap, the dual-station control logic outputs a reversal trigger window based on the adjusted phase relationship. The reversal trigger window is a time window used to limit the execution range of the pressing action; its width is determined by the timing distribution after reversal compression. The starting point of the reversal trigger window corresponds to the end time of the closing edge of the clearance gap, and the ending point corresponds to the preparation time for the next station switch. Within the reversal trigger window, the pressing action, conveying reset, and semi-finished product handover all occur within a coordinated time frame. The reversal trigger window not only limits the action triggering but also provides a time reference for subsequent frequency misalignment pulse clearance control, enabling frequency misalignment control to achieve frequency alternation and action rhythm uniformity with the boundary of the reversal trigger window as a reference. Through this process, the dual-station system can maintain the timing stability and rhythmic continuity of the pressing action even during dynamic changes in cycle time, load fluctuations, or process switching, avoiding action overlap or pressing conflicts at the moment of switching. Thus, the dual-station top and bottom box production equipment achieves adaptive coordination at the timing level through a continuous process of sequence position write-back identification, phase foldback compression, trigger point alignment, and foldback trigger window output, enabling the entire production cycle to maintain continuous, stable, and high-precision pressing control in a dynamic environment.

[0038] Based on the reversal trigger window, the station boundary area is controlled by misfrequency pulse yielding. Within the reversal trigger window, the alternating switching of micro-push amplitude limiting control, micro-retraction gain control, and compaction delay control is executed in sequence. The semi-finished products that are stuck in the boundary area are rhythmically pulled away from the boundary area, thereby blocking the formation of the stacked compaction chain. Based on the reversal trigger window, frequency-shifting pulses are used to adjust the boundary area of ​​the workstation. By introducing a rhythmic frequency-shifting drive mechanism within the dual-station switching cycle of the top-and-bottom box production equipment, the boundary area of ​​the workstation experiences orderly alternations of micro-pushing, micro-retraction, and delayed pressing within the time limit defined by the reversal trigger window. This creates a rhythmic traction effect on the stagnant semi-finished products, thereby smoothly guiding them away from the boundary area without affecting the continuity of the main cycle, ultimately preventing the formation of the stacked material compaction chain. The specific steps are as follows: After the return trigger window outputs, the dual-station control logic uses the time range of the return trigger window as the execution cycle for the mis-frequency pulse yielding control. Within this time range, all actions in the station boundary area are subject to the time constraint of the return trigger window to ensure that all types of control actions are executed under the same time reference. The dual-station control logic first applies micro-push limiting control to the upstream conveyor mechanism based on the start time of the return trigger window. Micro-push limiting control is used to drive the semi-finished products in the boundary area forward with a very small push amount in the initial stage of the return trigger window. Its function is to relieve the static friction between the stagnant semi-finished products and the upstream conveyor surface through slight push, so that the semi-finished products have controlled movement capabilities in the boundary area. The push amount of micro-push limiting control is limited to a range that does not trigger new material entry, and its duration covers the first part of the time interval of the return trigger window. In this stage, the dual-station control logic keeps the pressing action in a delayed state, so that only slight push occurs in the boundary area without triggering high-force actions, thereby providing an adjustable motion margin for subsequent micro-retraction gain control.

[0039] After completing the micro-push limiting control, the dual-station control logic executes micro-retraction gain control within the middle time interval of the reversal trigger window. Micro-retraction gain control starts with the forward displacement generated by the micro-push limiting control and induces the stagnant semi-finished products to move backward away from the boundary through reverse micro-traction. This process applies a micro-retraction action to the conveying mechanism in the opposite direction of the push, causing the semi-finished products in the boundary area to experience rhythmic changes of forward and backward movement within a short cycle, thus generating a breathing-like movement rhythm. This rhythm helps break the stacking state at the mechanical contact level, creating a separable movement interface between the stagnant semi-finished products and the surrounding semi-finished products. During the implementation of micro-retraction gain control, the traction intensity is dynamically adjusted according to the duration of the reversal trigger window, creating a staggered frequency relationship with the previous push action. That is, the action periods of push and retraction do not completely overlap, but rather form an interlaced rhythm on the time axis. Through this staggered frequency driving mode, the semi-finished products in the boundary area repeatedly experience micro-displacement changes of push, stop, and retraction within a short period, thus gradually leaving the stacked area without disrupting the overall conveying rhythm.

[0040] After the micro-retraction gain control is completed, the dual-station control logic enters the pressing delay control stage. Pressing delay control is executed in the latter part of the reversal trigger window. Its function is to ensure that the spatial clearance formed by the aforementioned micro-push and micro-retraction is completely closed before the pressing operation is performed, by delaying the trigger time of the pressing action. In this stage, the pressing action does not start immediately but remains delayed until the semi-finished product has completely left the boundary area. Through this delayed triggering method, the high-force pressing process of the pressing unit will not overlap with the micro-displacement action of the conveying mechanism, thereby avoiding deformation of the semi-finished product or abnormal stress on the mold caused by the pressing action applying force while the product is in a suspended state. Pressing delay control not only staggers the execution time from the push and retraction actions but also forms a rhythmic chain of sequential actions in its operational logic, creating a dynamic balance relationship of alternating time and complementary functions among the three actions within the entire reversal trigger window. The execution duration of this delay control is determined by the remaining time of the reversal trigger window, ensuring that the pressing action always occurs after the spatial clearance is completed, achieving smooth closure of the station boundary.

[0041] At the end of the turnaround trigger window, the dual-station control logic sequentially merges the execution results of the aforementioned micro-push limiting control, micro-retraction gain control, and pressing delay control, forming a closed-loop rhythm for the entire mis-frequency pulse yielding regulation. During this stage, after multiple rounds of alternating micro-push and micro-retraction actions, the semi-finished products within the boundary area gradually migrate from the overlapping area to the safe transport area. The end of the turnaround trigger window marks the completion of the mis-frequency regulation cycle and provides a new time reference for the next dual-station switching cycle. Before the turnaround trigger window closes, the pressing action smoothly starts after the delay control is released, allowing the semi-finished products that left the boundary in the previous stage to complete normal forming, and the new transport cycle can be seamlessly connected. Through this mis-frequency pulse yielding regulation method within the turnaround trigger window, the boundary area maintains a continuous micro-dynamic flow state throughout the production process, preventing static stacking due to cycle adjustments or stagnant semi-finished products. This method achieves flexible distribution of mechanical energy through rhythmic small-amplitude movements, enabling the workstation boundary area to complete the balanced evolution of three types of movements—pushing, retracting, and pressing—within each turnaround cycle. This prevents the formation of the stacked material compaction chain, avoids abnormal stress on the mold and guide structure, and ensures that the dual-station top and bottom box production equipment maintains high-precision synchronous operation and long-term stability in continuous production.

[0042] This invention introduces dynamic occupancy tracking and frequency-shifting pulse yielding control into the workstation boundary areas of a dual-station top-and-bottom box production line, enabling a flexible and coordinated relationship between feeding, conveying, and pressing actions in time. When the production cycle shifts transiently due to process changes, the occupancy status of the workstation boundary areas can be identified in real time and actively triggered to activate yielding lock control. This allows the stalled semi-finished products to be smoothly guided away from the stacking area under rhythmic guidance, avoiding conveyor blockages and mold overload caused by brief stops. Through this rhythmic adaptive control, the production line's operating cycle remains continuous, the impact load during equipment movement is reduced, and the overall operational stability and molding accuracy are improved.

[0043] This invention integrates the timing of pushing, retraction, and pressing actions within the reversal trigger window, enabling dynamic staggered execution of high-force actions and spatial clearance processes, fundamentally preventing the formation of a semi-finished product stacking and compaction chain. This time allocation method ensures more balanced energy transfer at the station boundary areas, maintaining consistent stress on the semi-finished product during conveying and forming processes, effectively preventing cumulative deformation of the mold and guide structure. This control method ensures stable cycle time even under high-load continuous operation of the dual stations, improving the long-term operational reliability and forming quality stability of the equipment.

[0044] This invention provides, for example Figure 2 The control system for a dual-station junction box production equipment shown includes a dynamic occupancy monitoring module, a boundary clearance locking module, a breathing clearance traction module, a phase foldback pressure control module, and a frequency misalignment clearance adjustment module. The dynamic occupancy monitoring module establishes a dynamic occupancy recording band in the work station boundary area of ​​the dual-station top and bottom box production equipment, continuously records the entry time, exit time and dwell increment of the semi-finished product, generates a boundary occupancy status string, and outputs the occupancy threshold line based on the boundary occupancy status string. The boundary clearance lock control module controls the feeding push command based on the occupancy threshold. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. The breathing yielding traction module drives the front-stage conveying mechanism to perform breathing micro-yielding traction according to the yielding gap list. It performs micro-step retraction of the gray board according to the rhythm of the yielding gap list, and rearranges the arrival sequence of the gray board after the retraction is completed, generating a sequence write-back identifier. The phase foldback pressure control module performs phase foldback compression on the dual-station switching timing according to the sequence write-back identifier, aligns the trigger point of the pressing action with the closed edge of the clearance gap, and outputs the foldback trigger window; The frequency misalignment control module performs frequency misalignment pulse control on the boundary area of ​​the workstation based on the return trigger window. Within the return trigger window, it sequentially performs alternating switching of micro-push amplitude limiting control, micro-retraction gain control, and compaction delay control, thereby rhythmically pulling the stagnant semi-finished products away from the boundary area and thus blocking the formation of the stacked compaction chain.

[0045] The present invention provides a control method for a dual-station top and bottom box production equipment, which is implemented by the above-mentioned dual-station top and bottom box production equipment control system. For details of the specific method and process of the dual-station top and bottom box production equipment control system, please refer to the above-mentioned embodiment of the dual-station top and bottom box production equipment control method, which will not be repeated here.

[0046] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A control method for a dual-station top and bottom box production equipment, characterized in that, Includes the following steps: A dynamic occupancy tracking band is established in the work station boundary area of ​​the dual-station top and bottom box production equipment to continuously record the entry time, exit time and dwell increment of the semi-finished product, generate the boundary occupancy status string, and output the occupancy threshold line based on the boundary occupancy status string. The steps for obtaining the dwell increment are as follows: When the semi-finished product experiences a short pause or speed change, the dynamic occupancy tracing tape calculates the dwell increment based on the degree of delay at the departure time, thereby converting a single dwell phenomenon into a continuous occupancy growth. Based on the occupancy threshold, the feeding push command is controlled by boundary clearance lock. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. Among them: the clearance list details the changes in available space of the boundary area before and after the freezing point and the upstream conveying channel, including the time of generation of each clearance, the width of the clearance and the time position of the corresponding conveying section; the clearance list is used to guide the subsequent breathing-type micro-yield traction operation and provides spatial reference for the subsequent micro-step adjustment of the gray board. According to the clearance list, the front-stage conveying mechanism is driven to perform breathing-type micro-yield traction, and the gray board is retracted in micro-steps according to the rhythm of the clearance list. After the retraction is completed, the arrival sequence of the gray board is rearranged to generate a sequence write-back mark. Among them: the sequence write-back identifier records the final arrival sequence information of each gray board after the clearance adjustment is completed, as well as its synchronization status with the workstation action cycle; by introducing the sequence write-back identifier, the timing coordination between the two workstations no longer depends on fixed cycle parameters, but is dynamically adjusted according to the update results of the actual delivery sequence. Based on the sequence write-back identifier, the phase foldback compression is performed on the dual-station switching timing to align the trigger point of the pressing action with the closed edge of the clearance gap, and the foldback trigger window is output. Among them, the closed edge of the clearance gap represents the moment when the previous stage of spatial adjustment is completed, and it is also the node when the boundary area is ready for feeding again. Based on the reversal trigger window, the workstation boundary area is adjusted by frequency-shifting pulses. Within the reversal trigger window, micro-push amplitude limiting control, micro-retraction gain control, and pressing delay control are alternately executed to rhythmically pull the stranded semi-finished products out of the boundary area.

2. The control method for a dual-station top and bottom box production equipment according to claim 1, characterized in that, The steps for outputting the placeholder threshold are as follows: In the work station boundary area of ​​the dual-station top and bottom box production equipment, a monitoring range of dynamic occupancy marking band is set, and the monitoring range is set to cover the transition zone between adjacent work stations. After recording the entry time of the semi-finished product, the movement status of the semi-finished product within the workstation boundary area is continuously tracked. When the semi-finished product leaves the workstation boundary area, the departure time is recorded, and the dwell increment is determined based on the time difference between the entry time and the departure time. After obtaining the entry time, exit time, and dwell increment of multiple semi-finished products, they are combined in chronological order to form a boundary occupancy status string, and the degree of congestion in the workstation boundary area is reflected based on the occupancy status string. After generating the boundary occupancy state string, the cumulative change of the dwell increment is analyzed, and the occupancy threshold is output.

3. The control method for a dual-station top and bottom box production equipment according to claim 2, characterized in that, When outputting the occupancy threshold, the cumulative proportion of the occupancy increment in the boundary occupancy status string is dynamically compared and converted into threshold information that reflects the real-time occupancy trend of the workstation boundary area. The threshold information is then output to the feeding control unit.

4. The control method for a dual-station top and bottom box production equipment according to claim 2, characterized in that, The steps for boundary clearance lock control of the feed push command based on the occupancy threshold are as follows: After obtaining the occupancy threshold line output by the dynamic occupancy tracing tape, the occupancy threshold line is used as the dynamic boundary reference for feeding and pushing. The feeding control unit monitors the occupancy trend change of the station boundary area according to the relationship between the occupancy threshold line and the boundary occupancy status string. When the occupancy status reaches the occupancy threshold line, the feeding and pushing command is frozen. After the feeding push command is frozen, the feeding control unit initiates the clearance release operation based on the occupancy status string data at the time of freezing, and slowly retracts the front conveyor mechanism in a micro-intermittent manner to release the space margin. After the clearance is released, the feed control unit generates a corresponding clearance list based on the difference between the occupancy status strings before and after freezing. After generating the clearance list, the feed control unit performs dynamic preprocessing on the frozen state based on the clearance list. When the frozen state drops below the clearance threshold, the frozen state is released and the triggering of the feed push command is restored.

5. The control method for a dual-station top and bottom box production equipment according to claim 4, characterized in that, After the feeding push command is frozen, the feeding control unit performs a slow retreat action in stages according to the changing trend of the occupancy threshold line during the release of the clearance gap, so that the released space margin and the occupancy increment of the boundary area maintain a proportional correspondence, and adjusts the recovery time of the feeding push according to the rhythm of the clearance gap list before the freeze is lifted.

6. The control method for a dual-station top and bottom box production equipment according to claim 4, characterized in that, The steps for driving the front-stage conveyor mechanism to perform breathing-type micro-yield traction according to the clearance list are as follows: After the clearance list is generated, the feed control device drives the front conveyor to perform breathing micro-retraction according to the time sequence of the clearance list; When performing breathing-type micro-yield traction, the feeding control device performs micro-step retraction of the gray board according to the rhythm of the yield gap list; After completing the micro-step retraction, the feeding control device rearranges the arrival sequence of the gray boards according to their positions after the retraction. After the sequence is rearranged, the feeding control device generates a sequence write-back identifier based on the rearranged gray board position.

7. The control method for a dual-station top and bottom box production equipment according to claim 6, characterized in that, The steps for performing phase foldback compression on the dual-station switching timing based on the sequence bit write-back flag are as follows: After obtaining the sequence write-back identifier generated by the breathing micro-retreat traction process, the dual-station control logic uses the sequence write-back identifier as a time reference for switching timing adjustment and adjusts the station switching phase according to the sequence write-back identifier. After determining the offset relationship between the sequence write-back identifier and the workstation switching phase, the dual-workstation control logic starts the phase foldback compression process to adjust the workstation timing through reverse compression. After the phase foldback compression is completed, the dual-station control logic uses the closed edge of the clearance gap as the key reference for timing alignment to reposition the trigger point of the pressing action. After the pressing action trigger point and the closing edge are aligned, the dual-station control logic outputs a return trigger window to limit the execution range of the pressing action.

8. The control method for a dual-station top and bottom box production equipment according to claim 7, characterized in that, During the phase foldback compression process, the dual-station control logic dynamically adjusts the trigger time of the pressing action based on the sequential data of the sequence bit write-back identifier to ensure that the start time of the pressing action is aligned with the end time of the closing edge, and outputs the foldback trigger window after the trigger point is aligned.

9. The control method for a dual-station top and bottom box production equipment according to claim 8, characterized in that, The steps for adjusting the frequency shift pulse clearance in the workstation boundary area based on the reversal trigger window are as follows: After the return trigger window is output, the dual-station control logic uses the time range of the return trigger window as the execution cycle of the frequency error pulse yield control, and applies micro-push limiting control to the front-stage conveying mechanism in the initial stage of the return trigger window. After completing the micro-push limiting control, the dual-station control logic performs micro-retraction gain control in the middle time interval of the turnaround trigger window, forming a breathing-like movement rhythm of the semi-finished product through reverse micro-traction. After the micro-retraction gain control is completed, the dual-station control logic performs compression delay control in the later time interval of the turnaround trigger window; At the end of the turnaround trigger window, the dual-station control logic merges the execution results of micro-push limiting control, micro-retraction gain control, and compression delay control in a timing sequence.

10. A control system for a dual-station top-and-bottom box production equipment, used to implement the control method for a dual-station top-and-bottom box production equipment as described in any one of claims 1-9, characterized in that, It includes a dynamic occupancy monitoring module, a boundary yielding locking module, a respiratory yielding traction module, a phase re-entry pressure control module, and a frequency misalignment yielding adjustment module: The dynamic occupancy monitoring module establishes a dynamic occupancy recording band in the work station boundary area of ​​the dual-station top and bottom box production equipment, continuously records the entry time, exit time and dwell increment of the semi-finished product, generates a boundary occupancy status string, and outputs the occupancy threshold line based on the boundary occupancy status string. The boundary clearance lock control module controls the feeding push command based on the occupancy threshold. When the boundary occupancy status string reaches the occupancy threshold, the feeding push command is frozen, and the clearance gap is released in the frozen state to generate the corresponding clearance gap list. The breathing yielding traction module drives the front-stage conveying mechanism to perform breathing micro-yielding traction according to the yielding gap list. It performs micro-step retraction of the gray board according to the rhythm of the yielding gap list, and rearranges the arrival sequence of the gray board after the retraction is completed, generating a sequence write-back identifier. The phase foldback pressure control module performs phase foldback compression on the dual-station switching timing according to the sequence write-back identifier, aligns the trigger point of the pressing action with the closed edge of the clearance gap, and outputs the foldback trigger window; The frequency misalignment control module performs frequency misalignment pulse control on the workstation boundary area based on the return trigger window. Within the return trigger window, it sequentially performs alternating switching of micro-push amplitude limiting control, micro-retraction gain control, and pressing delay control, thereby rhythmically pulling the stagnant semi-finished products out of the boundary area.

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