Control method for cold and hot vehicle of carding machine

Abstract

The invention discloses a control method for a cold and hot vehicle of a carding machine and belongs to the technical field of carding machines. The control method comprises the steps of setting threshold parameters for judging cold and hot vehicle states, collecting actual operation parameters of the carding machine, judging whether the carding machine is in a cold vehicle state or a hot vehicle state currently according to the threshold parameters and the actual operation parameters, and controlling the production speed of the doffer according to the judgment result. And in the operation process, actual operation parameters are continuously monitored, and switching between the cold and hot vehicle states is achieved. The threshold value parameters comprise a downtime threshold value, a driving time threshold value and a temperature threshold value, and the actual operation parameters comprise the actual downtime and the actual driving time of the doffer and the actual temperature of the key position. According to the invention, automatic identification of the cold and hot vehicle state of the carding machine and self-adaptive control of the speed are realized, and the accuracy of cold and hot vehicle state discrimination and the automation level of the production process are improved.

Description

Technical Field

[0001] This invention relates to the field of carding machine technology, specifically to a control method for the hot and cold operation of a carding machine. Background Technology

[0002] The carding machine is an important piece of equipment in the textile industry. It is mainly used to comb the fiber raw materials after the opening and cleaning process, separating the fiber bundles into individual fibers and removing residual impurities and short fibers, ultimately forming a fiber sliver, or sliver, with specific dimensions. The main working parts of the carding machine include the cylinder, licker-in roller, flats, and doffer. These parts rotate at high speed and work together to complete the fiber combing task. For the carding machine to operate normally, all moving parts need to reach suitable operating temperatures. When the equipment is within its normal operating temperature range, the clearance between components, the fluidity of the lubricating grease, and the dimensions of the metal materials are all at their designed optimal states, resulting in the best combing effect.

[0003] In actual production, carding machines may stop due to shift changes, maintenance, troubleshooting, or production plan adjustments. When a carding machine is restarted after a long period of downtime, the temperature of the various components has dropped to near ambient temperature. The increased viscosity of the lubricating grease leads to decreased fluidity, and the metal parts experience changes in their clearances due to thermal expansion and contraction. At this point, the machine is in a cold-run state. If production is directly carried out at the conventional warm-run speed in this cold-run state, it can easily cause problems such as insufficient fiber combing and uneven combing force. This results in increased neps content in the sliver, decreased fiber parallelism, and poor yarn evenness, ultimately affecting the processing quality of subsequent processes and the final yarn quality.

[0004] Currently, judging the hot / cold status of carding machines mainly relies on the operator's experience. Operators determine whether the machine is cold based on the length of downtime, the ambient temperature of the workshop, and their personal experience, and decide whether to preheat it at a lower speed. This manual judgment method is highly subjective and lacks standardized criteria; different operators may have different judgments on the hot / cold status, easily leading to errors. Furthermore, manual judgment requires operators to constantly monitor the machine's operating status and adjust the speed as needed, increasing their workload and hindering automated management of the production process.

[0005] Therefore, there is a need for a control method and system that can automatically identify the hot and cold status of a carding machine and adjust its operating speed accordingly, so as to improve the accuracy of hot and cold status identification and the level of automation in the production process. Summary of the Invention

[0006] To address the problems existing in the background art, the present invention provides a method for controlling the hot and cold operation of a carding machine, comprising the following steps:

[0007] S1. Set threshold parameters for judging cold and hot engine status, including a shutdown time threshold, a start-up time threshold, and a temperature threshold.

[0008] S2. Collect the actual operating parameters of the carding machine, including the actual downtime of the doffer, the actual start-up time of the doffer after this start-up, and the actual temperature of the key locations.

[0009] S3. Based on the threshold parameter and the actual operating parameters, determine whether the carding machine is currently in a cold or hot state.

[0010] S4. Control the production speed of the doffer according to the judgment result. When the machine is cold, it runs at the cold speed. When the machine is hot, it runs at the hot speed.

[0011] S5. During operation, continuously monitor the actual operating parameters, and when the state transition conditions are met, realize the switching between cold start state and hot start state.

[0012] Furthermore, step S1 includes:

[0013] S11, Set the downtime threshold This is used to determine whether the engine should be started cold after the french has stopped.

[0014] S12, Set driving time threshold This is used to determine whether the running time of the french meets the conditions for transitioning from a cold start to a hot start.

[0015] S13, Set temperature threshold This is used to determine whether the temperature at key locations has reached the conditions required for a warm-up engine.

[0016] S14, Set warm-up speed And cold start speed Cold start speed Calculate using the following formula: ;

[0017] In the formula, This refers to the speed when the engine is cold. is the warm-up speed; K is the cold-up speed coefficient, with a value ranging from 50% to 80%.

[0018] Furthermore, step S2 includes:

[0019] S21. Record the actual downtime of the refurbisher via the controller. ;

[0020] S22. Record the actual driving time of the Dorf after this start-up via the controller. ;

[0021] S23. Collect the actual temperature at key locations using a temperature sensor. The key locations include one or more of the following: cylinder bearing location, front cover plate location, rear cover plate location, or front and rear fixed cover plate locations of the cylinder.

[0022] Furthermore, step S3 includes:

[0023] S31. The engine is considered to be in a cold state when any of the following conditions are met:

[0024] Condition a: Actual downtime And it is in a newly started state;

[0025] Condition b: Actual driving time ;

[0026] Condition c: Actual temperature ;

[0027] S32. The engine is considered to be in a warm-up state when the following conditions are met simultaneously:

[0028] Condition d: Actual downtime or actual driving time ;

[0029] Condition e: Actual temperature .

[0030] Furthermore, step S4 includes:

[0031] S41. When the judgment result is cold start state, the controller sends a cold start speed command to the driver, and the driver controls the doffer to run at the cold start speed. run;

[0032] S42. When the determination result is "warm-up state", the controller sends a warm-up speed command to the driver, and the driver controls the doffer to operate at the warm-up speed. run.

[0033] Furthermore, step S5 includes:

[0034] S51. During cold start operation, when the actual start time... And actual temperature At that time, the controller will change the running speed of the refurbisher from the cold start speed. Switch to warm-up speed ;

[0035] S52. During operation in warm-up mode, after the doffer stops, the controller records the actual downtime. And stored in the data storage module; when the actual downtime Upon the next startup, the controller will switch the Dorf's operating speed to the cold start speed. .

[0036] Furthermore, a standard start-up procedure is included before step S3:

[0037] S01. The controller starts the cylinder, licker-in roller and cover plate. After the cylinder and licker-in roller reach a stable speed, the controller sends a start command to the doffer.

[0038] S02. After the fryer starts, it performs slow feeding operations at the head and tail of the fryer.

[0039] S03. After the strip is introduced into the coiler, proceed to step S3.

[0040] The present invention also provides a control system for the hot and cold operation of a carding machine, for implementing the above control method, comprising:

[0041] Controller, the controller being used to set a downtime threshold Driving time threshold Temperature threshold Warm-up speed The cold start speed coefficient K was calculated, and the actual downtime of the french was recorded. and actual driving time ;

[0042] A temperature sensor is installed at a key location on the carding machine, including one or more of the following locations: the cylinder bearing location, the front of the cover plate location, the rear of the cover plate location, or the front and rear fixed cover plate locations of the cylinder. The temperature sensor is connected to the controller signal and is used to collect the actual temperature at the key location. And transmit it to the controller;

[0043] The driver, connected to the doffer and signal-connected to the controller, is used to receive speed control commands from the controller and drive the doffer at a cold start speed. Or warm-up speed run;

[0044] The human-machine interface, electrically connected to the controller, is used to input a downtime threshold. Driving time threshold Temperature threshold Warm-up speed The system displays the cold start speed coefficient K, the current cold / hot start status, and the actual downtime. Actual driving time Actual temperature and current running speed;

[0045] A data storage module, located within the controller, is used to store the actual downtime of each Doffer shutdown. ;

[0046] The carding machine includes a coiler, a doffer, a doffer triangle, a licker-in roller, a flat top, a cylinder, a dust collector cover, a large pressure roller, and a post-cylinder impurity area; the doffer is located in the doffer triangle; the controller adjusts the output based on actual downtime. Actual driving time Actual temperature With downtime threshold Driving time threshold Temperature threshold The comparison results determine the cold or hot engine status, and send the corresponding speed control command to the driver.

[0047] The controller is a programmable logic controller (PLC).

[0048] The control system includes a sensing layer, a control layer, and an execution layer; the sensing layer includes the temperature sensor, and the sensing layer is signal-connected to the control layer; the control layer is based on the programmable logic controller (PLC), and the control layer is signal-connected to the execution layer; the execution layer includes the driver.

[0049] The number of temperature sensors is multiple, and the multiple temperature sensors are respectively installed at the cylinder bearing position, the front position of the cover plate, the rear position of the cover plate, and the front and rear fixed cover plate positions of the cylinder.

[0050] Multiple temperature sensors are connected to the controller via signal transmission. The controller receives temperature signals collected by the multiple temperature sensors and selects one or more of them as the actual temperature. Used to determine whether a vehicle is cold or hot.

[0051] The beneficial effects achieved by this invention are as follows:

[0052] The carding machine hot / cold status control method provided by this invention achieves automatic identification of the carding machine's hot / cold status by setting threshold parameters such as stop time threshold, start time threshold, and temperature threshold, and collecting actual operating parameters such as the actual stop time of the doffer, the actual start time, and the actual temperature of key locations. Compared with the traditional method relying on operator experience, this invention adopts a multi-parameter comprehensive identification method, which improves the accuracy and reliability of hot / cold status identification, avoids the subjectivity and uncertainty that may exist in manual judgment, and makes the identification of hot / cold status more objective and accurate.

[0053] This invention automatically controls the doffer's production speed based on the determination of whether the machine is cold or hot. It operates at the cold machine speed when the machine is cold and at the hot machine speed when the machine is hot. The cold machine speed is calculated by multiplying the hot machine speed by a cold machine speed coefficient, providing a clear calculation basis and adjustability for setting the cold machine speed. Based on the speed adaptive control method for the equipment's hot state, the doffer's operating speed can be reduced in cold machine conditions to accommodate the incomplete preheating of the equipment. This avoids quality problems such as uneven fiber combing, increased neps, and increased short fiber content caused by operating at hot machine speeds in cold conditions, thereby improving the uniformity of the sliver and the stability of the yarn quality.

[0054] This invention continuously monitors actual operating parameters during operation and automatically switches between cold and hot operating states when the state transition conditions are met. During cold-start operation, when both the actual start-up time and actual temperature reach the corresponding thresholds, the system automatically switches the doffer's operating speed from cold-start speed to hot-start speed. During hot-start operation, when the actual downtime after the doffer stops exceeds the threshold, the system automatically switches back to cold-start speed upon the next startup. This dynamic monitoring and automatic switching mechanism achieves a smooth transition between cold and hot operating states without manual intervention from operators, improving the automation and continuity of the production process. Attached Figure Description

[0055] Figure 1 This is a schematic diagram of the overall structure of the carding machine of the present invention.

[0056] Figure 2 This is a structural block diagram of the control system for the carding machine's hot and cold sections according to the present invention.

[0057] Figure 3 This is a flowchart illustrating the control method for the hot and cold operation of the carding machine according to the present invention. Detailed Implementation

[0058] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] Reference Figures 1-3This invention provides a method for controlling the hot and cold operation of a carding machine, addressing yarn quality issues that may arise when the carding machine is run at conventional hot-run speeds in a cold state. In textile production, the carding machine is a crucial piece of equipment for combing raw fibers into a continuous fiber web and outputting slivers. Its normal operation requires all moving parts to reach suitable operating temperatures. When the carding machine is restarted after a prolonged shutdown, the lower temperatures of the components, reduced lubricant flow, and changes in the clearances of metal parts due to thermal expansion and contraction can easily lead to uneven fiber combing, increased neps, and higher short fiber content if it is run directly at hot-run speeds, thus affecting yarn quality.

[0060] The control method of this invention achieves automatic identification of the hot / cold status of the carding machine and adaptive speed control through steps such as setting threshold parameters, collecting actual operating parameters, determining the hot / cold machine status, controlling the production speed of the doffer 2, and monitoring state transitions. The doffer 2 is a key component in the carding machine that peels the fiber web from the cylinder 6 and outputs the sliver; its operating speed directly affects the uniformity and quality of the sliver.

[0061] Step S1 of the control method of the present invention involves setting threshold parameters for distinguishing between cold and hot machine states. These threshold parameters are pre-set benchmark values ​​used to determine whether the carding machine is in a cold or hot state, including a stop time threshold, a start time threshold, and a temperature threshold. The setting of these threshold parameters needs to be comprehensively determined based on factors such as the specific carding machine model, workshop ambient temperature, and production process requirements. Different thresholds can be set under different production conditions to adapt to actual needs.

[0062] Step S1 specifically includes steps S11, S12, S13, and S14. Step S11 involves setting a downtime threshold. This threshold is used to determine whether Doffer 2 needs to be restarted in a cold start mode after a shutdown. When the actual downtime of Doffer 2 exceeds this threshold, it indicates that the equipment has cooled sufficiently and the temperature of each component has dropped to a low level. In this case, it should be started in a cold start mode to avoid processing quality problems caused by components not being preheated. The threshold can be set with reference to the heat dissipation characteristics of the equipment and the ambient temperature conditions, and the preferred value can be set to 2h to 8h.

[0063] Step S12 is to set the driving time threshold. This threshold is used to determine whether the running time of Doffer 2 after startup meets the conditions for transitioning from a cold to a hot state. During the operation of the carding machine, the moving parts gradually heat up due to friction. When the running time reaches a certain level, the equipment temperature tends to stabilize, at which point the equipment can be considered to have entered a hot state. The setting of this threshold needs to take into account the heat capacity and heating characteristics of the equipment, and the preferred value can be set to 15 minutes to 60 minutes.

[0064] Step S13 is to set the temperature threshold. This threshold is used to determine whether the temperature at critical locations has reached the temperature required for the machine to be warmed up. Critical locations refer to parts of the carding machine that are sensitive to temperature changes and affect processing quality. Monitoring the temperature at these locations allows for accurate assessment of the equipment's thermal state. The temperature threshold setting needs to be determined based on the temperature range during normal operation of the equipment; a preferred value is 30°C to 50°C.

[0065] Step S14 is to set the warm-up speed. And cold start speed Hot-run speed refers to the production speed of the carding machine under normal warm-up conditions, usually determined based on production processes and product quality requirements. Cold-run speed refers to the production speed of the carding machine under cold-run conditions, which must be lower than the hot-run speed to accommodate the condition where the equipment is not fully preheated. Cold-run speed is calculated using the following formula: In the formula, The cold start speed is in m / min; The warm-up speed is m / min; This is the cold start speed coefficient. The value ranges from 50% to 80%. Cold start speed coefficient. The specific value can be adjusted according to the equipment condition, ambient temperature, and product quality requirements. A smaller value indicates a lower cold-start speed, resulting in higher equipment protection, but also a corresponding decrease in production efficiency. Calculating the cold-start speed using this formula allows for a balance between ensuring product quality and maximizing production efficiency.

[0066] Step S2 of the control method of the present invention involves collecting the actual operating parameters of the carding machine. The actual operating parameters refer to real-time data reflecting the current operating status of the carding machine, including the actual downtime of the doffer 2. The actual driving time of Dolph 2 after this start-up and the actual temperature at key locations The collection of these parameters is the basis for determining the hot or cold condition of a vehicle.

[0067] Step S2 specifically includes steps S21, S22, and S23. Step S21 involves recording the actual downtime of Doffer 2 via the controller. When Doffer 2 stops running, the controller starts timing and continuously records the downtime. This time data will serve as an important basis for determining the cold / hot status of the machine upon the next startup. The controller achieves accurate measurement of downtime through its built-in timing module and stores the data in a data storage module so that historical records can be retained even after the equipment is powered off.

[0068] Step S22 involves recording the actual driving time of Dolph 2 after this startup via the controller. Once Doffer 2 starts running, the controller begins to accumulate the duration of this operation. This time data is used to determine whether the equipment has run long enough to reach a warm-up state. The actual running time is measured from the moment Doffer 2 starts each time it starts until the equipment stops running, and the timer restarts from zero at the next startup.

[0069] Step S23 involves collecting the actual temperature at key locations using a temperature sensor. The key locations include one or more of the following: the bearing position of the licker-in roller 4, the front position of the cover plate 5, the rear position of the cover plate 5, or the fixed cover plate positions before and after the cylinder 6. The licker-in roller 4 is a high-speed rotating component in the carding machine used for preliminary opening and impurity removal of the fed fibers; its bearing temperature directly reflects the operating status of the equipment. The cover plate 5, in conjunction with the cylinder 6, performs fine carding of the fibers; temperature changes at the front and rear positions of the cover plate 5 reflect the thermal state of the carding area. The temperature at the fixed cover plate positions before and after the cylinder 6 reflects the working temperature of the main carding area. By installing temperature sensors at these key locations, comprehensive and accurate information about the equipment's thermal state can be obtained.

[0070] Step S3 of the control method described in this invention involves determining whether the carding machine is currently in a cold or hot state based on threshold parameters and actual operating parameters. A cold state refers to the carding machine being in a low-temperature state, not yet reaching its normal operating temperature; in this case, it should be operated at a lower cold-start speed. A hot state refers to the carding machine having reached its normal operating temperature, with all components in their optimal working condition; in this case, it can be operated at a warm-start speed to achieve optimal production efficiency and product quality.

[0071] Step S3 specifically includes steps S31 and S32. Step S31 determines the machine to be in a cold start state when any of the following conditions are met: Condition a is the actual downtime. Furthermore, it is in a newly started state, indicating that the equipment has just started after a relatively long period of shutdown, and the equipment temperature has sufficiently decreased at this time. Condition b is the actual start-up time. This condition indicates that although the equipment has been started and is running, the operating time is still short, and the equipment temperature has not yet risen to the normal operating temperature. Condition c is the actual temperature. This condition directly reflects that the temperature at the critical location has not yet reached the temperature level required for warm-up. These three conditions are logically ORed; as long as any one of the conditions is met, the machine is judged to be in a cold-run state. This judgment logic can ensure that the cold-run protection mechanism can be activated under any low-temperature conditions that may affect processing quality.

[0072] Step S32 determines the engine to be in a warm-up state when the following conditions are met simultaneously: Condition d is the actual downtime. or actual driving time This condition indicates that either the equipment has been shut down for a short time and the temperature has not yet dropped significantly, or it has been running long enough for the temperature to rise sufficiently. Condition e is the actual temperature. This condition indicates that the temperature at the critical location has reached the level required for warm-up. Conditions d and e are logically ANDed; both must be met simultaneously for the system to be considered warm-up. This logic ensures that the system only switches to warm-up mode after it has actually reached its normal operating temperature.

[0073] Step S4 of the control method described in this invention is to control the production speed of the doffer 2 based on the discrimination result. The operating speed of the doffer 2 directly affects the output speed and quality of the strip. By automatically adjusting the speed of the doffer 2 according to the hot and cold conditions of the strip, production efficiency can be considered while ensuring product quality.

[0074] Step S4 specifically includes steps S41 and S42. Step S41 is that when the determination result is a cold start state, the controller sends a cold start speed command to the driver, and the driver controls the doffer 2 to operate at the cold start speed. Operation. When the machine is cold, the temperature of its components is low, the viscosity of the lubricating grease is high, and the clearance between metal parts differs from that under normal operating conditions. Running the machine at a warm speed may lead to a decrease in combing efficiency. Running the machine at a lower cold speed allows it to gradually warm up under a lower load, avoiding fluctuations in processing quality caused by temperature changes.

[0075] Step S42 is as follows: when the determination result is a warm-up state, the controller sends a warm-up speed command to the driver, and the driver controls the doffer 2 to operate at the warm-up speed. Operation. Once the equipment temperature reaches the normal operating range, the operating status of each component tends to stabilize. At this point, it can be run at warm-up speed to achieve optimal production efficiency. The controller achieves precise control of the Doffer 2's operating speed through a signal connection with the drive.

[0076] Step S5 involves continuously monitoring actual operating parameters during operation and switching between cold and hot states when the state transition conditions are met. The thermal state of the carding machine is a dynamic process; the temperature gradually rises during operation and gradually decreases after shutdown. Therefore, continuous monitoring and timely adjustment of the operating speed based on state changes are necessary.

[0077] Step S5 specifically includes steps S51 and S52. Step S51 involves determining the actual start-up time during cold start operation. And actual temperature At that time, the controller will change the operating speed of Dolph 2 from the cold start speed. Switch to warm-up speed This switching process ensures a smooth transition from a cold start to a warm start, guaranteeing that the operating speed is only increased after the equipment has reached its normal operating temperature. Both start-up time and temperature must be met simultaneously to effectively avoid quality problems caused by premature switching due to only one condition being met.

[0078] Step S52 involves the controller recording the actual downtime after Doffer 2 stops during operation in a warm-up state. And stored in the data storage module. When the actual downtime... Upon the next startup, the controller will switch the operating speed of Dolph 2 to the cold start speed. It enables automatic identification and switching between hot and cold operating states, eliminating the need for operators to manually assess the equipment's thermal status. The data storage module ensures that downtime data is retained even after a power outage, allowing for accurate determination of the hot / cold operating state upon the next power-on restart.

[0079] Before step S3, the control method of the present invention also includes a conventional start-up procedure. The conventional start-up procedure is the standard operating procedure for starting the carding machine, including steps S01, S02, and S03. Step S01 involves the controller controlling the licker-in roller 4, cylinder 6, and flathead 5 to start. After the licker-in roller 4 reaches a stable speed, it sends a start command to the doffer 2. The start-up sequence of each component of the carding machine needs to follow certain process requirements. As the core component of the feeding system, the licker-in roller 4 needs to start first and reach a stable speed to ensure the continuity and uniformity of subsequent fiber feeding. The cylinder 6 and flathead 5, as the core components of the main carding system, need to start synchronously to establish a normal carding working state.

[0080] Step S02 involves a slow guide operation at the head and tail of the sliver after the doffer 2 starts. This slow guide operation refers to guiding the sliver at a lower speed during the initial output phase to facilitate the operator guiding the sliver head into the coiler 1. The coiler 1 is a device used to coil and collect the sliver output from the doffer 2; the sliver must be correctly guided into the coiler 1 before normal continuous production can begin. The slow guide operation reduces the sliver output speed, facilitating manual operation and preventing breakage or accumulation of the sliver during the guiding process.

[0081] Step S03 involves introducing the sliver into coiler 1 and then proceeding to step S3. Once the sliver is successfully introduced into coiler 1, it indicates that the carding machine has established a normal production process. At this point, step S3 can be entered to determine the hot / cold machine status, and based on the determination result, the doffer 2 is controlled at the corresponding cold machine speed. Or warm-up speed run.

[0082] The present invention also provides a control system for the hot and cold operation of a carding machine, the control system comprising a controller, a temperature sensor, a driver, a human-machine interface, and a data storage module.

[0083] The controller is the core component of the entire control system, used to set the downtime threshold. Driving time threshold Temperature threshold Warm-up speed and cold start speed coefficient And record the actual downtime of Dolph 2. and actual driving time The controller preferably uses a programmable logic controller (PLC), which features reliable operation, strong anti-interference capabilities, and flexible programming, making it suitable for industrial control applications. The controller executes a preset control program, compares the collected actual operating parameters with set threshold parameters, determines the current cold / hot vehicle status, and outputs corresponding speed control commands.

[0084] The temperature sensor is installed at key locations on the carding machine, including one or more of the following: the bearing position of the licker-in roller 4, the front position of the cover plate 5, the rear position of the cover plate 5, or the front and rear fixed cover plate positions of the cylinder 6. The temperature sensor is connected to the controller signal to collect the actual temperature at the key locations. The data is then transmitted to the controller. Multiple temperature sensors can be used, each installed at a different critical location, to provide a more comprehensive view of the equipment's thermal state. The controller receives temperature signals from multiple sensors and selects one or more as the actual temperature for determining whether the vehicle is in a cold or hot condition. Data processing can be performed using methods such as averaging, taking the maximum value, or taking the minimum value.

[0085] The driver is connected to the doffer 2 and is also signal-connected to the controller, used to receive speed control commands from the controller and drive the doffer 2 at a cold start speed. Or warm-up speed Operation. The drive can be a frequency converter or a servo drive, which achieves precise control of the Doffer 2's operating speed by adjusting the output frequency or speed. The drive is connected to the Doffer 2's motor via a power cable, and the drive is connected to the controller via a communication cable or analog signal line to transmit speed control commands.

[0086] The human-machine interface is electrically connected to the controller and is used to input the downtime threshold. Driving time threshold Temperature threshold Warm-up speed and cold start speed coefficient It displays the current cold / hot status of the engine and the actual downtime. Actual driving time Actual temperature The HMI (Human Machine Interface) provides operators with an interactive window for parameter setting and status monitoring. Operators can adjust various threshold parameters through the HMI according to actual production needs, and can also observe the equipment's operating status in real time. The HMI can be a touch screen or an industrial display, installed in a location easily accessible to the operator.

[0087] The data storage module is located within the controller and is used to store the actual downtime of Dolph 2 during each shutdown. The data storage module can use non-volatile memory to ensure that downtime data is not lost after the device is powered off. When the device is powered on again, the controller can read the last downtime record from the data storage module to determine whether the current startup needs to be performed in a cold start mode.

[0088] The carding machine includes a coiler 1, a doffer 2, a doffer triangle zone 3, a licker-in roller 4, a flat plate 5, a cylinder 6, a dust collector cover 7, a large pressure roller 8, and a cylinder after-waste zone 9. The doffer 2, located in the doffer triangle zone 3, is used to peel the fiber web from the cylinder 6 to form a sliver. The licker-in roller 4, in conjunction with the flat plate 5, performs initial opening and carding of the fibers. The cylinder 6 is the main carding component of the carding machine, working with the flat plate 5 to perform fine carding of the fibers. The dust collector cover 7 is used to remove short fibers and impurities generated during the carding process. The large pressure roller 8 is used to compact and shape the output sliver. The cylinder after-waste zone 9 is used to collect the short fibers and impurities that fall behind the cylinder 6. The coiler 1 is used to coil and collect the sliver output from the doffer 2.

[0089] The control system can be functionally divided into a sensing layer, a control layer, and an execution layer. The sensing layer includes temperature sensors for real-time acquisition of actual temperatures at key locations. The perception layer and control layer are connected by signals. The control layer, with a programmable logic controller (PLC) at its core, executes the logic for determining the cold / hot vehicle status based on the actual downtime. Actual driving time and actual temperature The comparison result with the corresponding threshold determines the current state and outputs the corresponding speed control command. The control layer and the execution layer are connected by signals. The execution layer includes a driver, which drives the doffer 2 at a cold start speed according to the command from the control layer. Or warm-up speed Operation. This hierarchical architecture makes the control system's structure clear and its functions well-defined, facilitating system debugging and maintenance.

[0090] The controller is based on the actual downtime. Actual driving time Actual temperature With downtime threshold Driving time threshold Temperature threshold The comparison results determine the hot / cold machine status and send corresponding speed control commands to the drive. When the machine is identified as cold, the controller controls the doffer 2 to run at a lower cold-machine speed, allowing the equipment to gradually warm up under a lower load. When the machine is identified as hot, the controller controls the doffer 2 to run at a normal hot-machine speed to achieve optimal production efficiency. After running in cold mode for a certain period of time, when the equipment temperature reaches the hot-machine condition, the controller automatically switches the doffer 2's running speed from cold-machine speed to hot-machine speed. If the doffer 2's downtime exceeds a threshold in hot-machine mode, the controller automatically switches the doffer 2's running speed back to cold-machine speed upon the next startup. Through this automatic identification and switching mechanism, this invention achieves intelligent management of the carding machine's hot / cold machine status, eliminating the need for manual judgment and adjustment by operators and improving the automation level of production management.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for controlling the hot and cold operation of a carding machine, characterized in that, Includes the following steps: S1. Set threshold parameters for judging cold and hot engine status, including a shutdown time threshold, a start-up time threshold, and a temperature threshold. S2. Collect the actual operating parameters of the carding machine, including the actual downtime of the doffer, the actual start-up time of the doffer after this start-up, and the actual temperature of the key locations. S3. Based on the threshold parameter and the actual operating parameters, determine whether the carding machine is currently in a cold or hot state. S4. Control the production speed of the doffer according to the judgment result. When the machine is cold, it runs at the cold speed. When the machine is hot, it runs at the hot speed. S5. During operation, continuously monitor the actual operating parameters, and when the state transition conditions are met, realize the switching between cold start state and hot start state.

2. The control method for the hot and cold machines of a carding machine according to claim 1, characterized in that, Step S1 includes: S11, Set the downtime threshold This is used to determine whether the engine should be started cold after the french has stopped. S12, Set driving time threshold This is used to determine whether the running time of the french meets the conditions for transitioning from a cold start to a hot start. S13, Set temperature threshold This is used to determine whether the temperature at key locations has reached the conditions required for a warm-up engine. S14, Set warm-up speed And cold start speed Cold start speed Calculate using the following formula: ; In the formula, This refers to the speed when the engine is cold. is the warm-up speed; K is the cold-up speed coefficient, with a value ranging from 50% to 80%.

3. The control method for the hot and cold machines of a carding machine according to claim 2, characterized in that, Step S2 includes: S21. Record the actual downtime of the refurbisher via the controller. ; S22. Record the actual driving time of the Dorf after this start-up via the controller. ; S23. Collect the actual temperature at key locations using a temperature sensor. The key locations include one or more of the following: cylinder bearing location, front cover plate location, rear cover plate location, or front and rear fixed cover plate locations of the cylinder.

4. The control method for the hot and cold machines of a carding machine according to claim 3, characterized in that, Step S3 includes: S31. The engine is considered to be in a cold state when any of the following conditions are met: Condition a: Actual downtime And it is in a newly started state; Condition b: Actual driving time ; Condition c: Actual temperature ; S32. The engine is considered to be in a warm-up state when the following conditions are met simultaneously: Condition d: Actual downtime or actual driving time ; Condition e: Actual temperature .

5. The control method for the hot and cold machines of a carding machine according to claim 4, characterized in that, Step S4 includes: S41. When the judgment result is cold start state, the controller sends a cold start speed command to the driver, and the driver controls the doffer to run at the cold start speed. run; S42. When the determination result is "warm-up state", the controller sends a warm-up speed command to the driver, and the driver controls the doffer to operate at the warm-up speed. run.

6. The control method for the hot and cold machines of a carding machine according to claim 5, characterized in that, Step S5 includes: S51. During cold start operation, when the actual start time... And actual temperature At that time, the controller will change the running speed of the refurbisher from the cold start speed. Switch to warm-up speed ; S52. During operation in warm-up mode, after the doffer stops, the controller records the actual downtime. And stored in the data storage module; when the actual downtime Upon the next startup, the controller will switch the Dorf's operating speed to the cold start speed. .

7. The control method for the hot and cold machines of a carding machine according to claim 1, characterized in that, The standard driving procedure is also included before step S3: S01. The controller starts the cylinder, licker-in roller and cover plate. After the cylinder and licker-in roller reach a stable speed, the controller sends a start command to the doffer. S02. After the fryer starts, it performs slow feeding operations at the head and tail of the fryer. S03. After the strip is introduced into the coiler, proceed to step S3.

8. A control system for the hot and cold operation of a carding machine, used to implement the control method according to any one of claims 1 to 7, characterized in that, include: Controller, the controller being used to set a downtime threshold Driving time threshold Temperature threshold Warm-up speed The cold start speed coefficient K was calculated, and the actual downtime of the french was recorded. and actual driving time ; A temperature sensor is installed at a key location on the carding machine, including one or more of the following locations: the cylinder bearing location, the front of the cover plate location, the rear of the cover plate location, or the front and rear fixed cover plate locations of the cylinder. The temperature sensor is connected to the controller signal and is used to collect the actual temperature at the key location. And transmit it to the controller; The driver, connected to the doffer and signal-connected to the controller, is used to receive speed control commands from the controller and drive the doffer at a cold start speed. Or warm-up speed run; The human-machine interface, electrically connected to the controller, is used to input a downtime threshold. Driving time threshold Temperature threshold Warm-up speed The system displays the cold start speed coefficient K, the current cold / hot start status, and the actual downtime. Actual driving time Actual temperature and current running speed; A data storage module, located within the controller, is used to store the actual downtime of each Doffer shutdown. ; The carding machine includes a coiler, a doffer, a doffer triangle, a licker-in roller, a flat top, a cylinder, a dust collector cover, a large pressure roller, and a post-cylinder impurity area; the doffer is located in the doffer triangle; the controller adjusts the output based on actual downtime. Actual driving time Actual temperature With downtime threshold Driving time threshold Temperature threshold The comparison results determine the cold or hot engine status, and send the corresponding speed control command to the driver.

9. The control system for the hot and cold machine of a carding machine according to claim 8, characterized in that: The controller is a programmable logic controller (PLC). The control system includes a sensing layer, a control layer, and an execution layer; the sensing layer includes the temperature sensor, and the sensing layer is signal-connected to the control layer; the control layer is based on the programmable logic controller (PLC), and the control layer is signal-connected to the execution layer; the execution layer includes the driver.

10. The control system for the hot and cold machine of a carding machine according to claim 8, characterized in that: The number of temperature sensors is multiple, and the multiple temperature sensors are respectively installed at the cylinder bearing position, the front position of the cover plate, the rear position of the cover plate, and the front and rear fixed cover plate positions of the cylinder. Multiple temperature sensors are connected to the controller via signal transmission. The controller receives temperature signals collected by the multiple temperature sensors and selects one or more of them as the actual temperature. Used to determine whether a vehicle is cold or hot.

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