A ring spinning frame collective doffing control system and control method

Abstract

The application relates to a ring spinning frame collective doffing control system and a control method, and the control system comprises a collective doffing element, a main machine element, a ring rail plate control system and a man-machine interface. The main machine element receives signals sent by the collective doffing element and sends control signals to the collective doffing element. The man-machine interface receives signals sent by the main machine element and the collective doffing element, and controls the main machine element, the collective doffing element and the ring rail plate frequency converter through the man-machine interface. The collective doffing element mainly comprises a collective doffing switching power supply and a collective doffing PLC. The collective doffing switching power supply provides electric energy for the whole collective doffing element and the ring rail plate frequency converter. The main machine element mainly comprises a main machine switching power supply for providing electric energy for the whole main machine element and a main machine PLC. The main machine PLC is in communication connection with the man-machine interface and the collective doffing PLC. The application can avoid the spinning frame fault shutdown caused by the operation error of the staff, and simultaneously reduces the transformation cost.

Description

Technical Field

[0001] This invention belongs to the field of ring spinning machines, and specifically relates to a collective doffing control system and control method for ring spinning machines. Background Technology

[0002] Currently, a large number of ring spinning machines are not equipped with a collective doffing device. These machines require manual yarn removal by operators, which increases the labor intensity of workers and reduces production efficiency and economic benefits. At the same time, due to the large number of ring spinning machines without collective doffing devices, the cost of retrofitting these machines is high. Furthermore, the human-machine interface style of the control system in the retrofitted ring spinning machine is significantly different from that of the original human-machine interface, making it difficult for operators to master the operation of the collective doffing device. This can easily lead to machine malfunctions and shutdowns due to operational errors. Summary of the Invention

[0003] The purpose of this invention is to provide a collective doffing control system and method for ring spinning machines, which can reduce modification costs while avoiding machine malfunctions and shutdowns caused by operator errors.

[0004] The technical solution of the present invention is as follows: a collective doffing control system for a ring spinning frame, comprising: a collective doffing element, a main unit element, a ring rail control system, and a human-machine interface. The ring rail control system mainly includes a ring rail frequency converter for controlling the operation of the ring rail in the spinning frame. The main unit element receives signals sent by the collective doffing element and sends control signals to the collective doffing element. The human-machine interface receives signals sent by the main unit element and the collective doffing element, and controls the main unit element, the collective doffing element, and the ring rail frequency converter through the human-machine interface.

[0005] The collective doffing element includes a servo motor and multiple solenoid valves required for the ring spinning machine to complete the collective doffing action. The multiple solenoid valves control the rotation of the yarn guide plate, the inward and outward swing of the herringbone arm, and the inflation and deflation of the bobbin gripper. The servo motor drives the collective doffing device to move the spinning bobbin up and down. The collective doffing element also includes:

[0006] The collective doffing switching power supply is connected to the control terminals of the ring plate frequency converter. The collective doffing switching power supply converts the input 220V AC power into 24V and provides power to the entire collective doffing element. At the same time, the collective doffing switching power supply provides power to the ring plate frequency converter through the 24V control terminals of the ring plate frequency converter.

[0007] The collective doffing PLC is connected to the main unit via RS485. The collective doffing PLC is connected to multiple solenoid valves and servo motors. At the same time, the collective doffing PLC is also connected to the empty tube lifting motor and the full yarn lifting motor. The collective doffing PLC controls multiple solenoid valves and servo motors to complete the doffing action of the ring spinning machine. The collective doffing PLC controls the full yarn lifting motor to remove the full yarn spinning bobbin from the spinning machine. The collective doffing PLC controls the empty tube lifting motor to place the empty spinning bobbin on the spinning machine.

[0008] The main components include a main shaft motor, a main shaft brake, a cotton suction fan, and a cleaner motor required for the ring spinning machine to complete the spinning operation. The main shaft motor drives the main shaft of the ring spinning machine to spin yarn, while the main shaft brake stops the spinning machine. During the spinning process, the cotton suction fan provides negative pressure to the yarn, and the cleaner motor cleans the ring spinning machine simultaneously. The main components also include:

[0009] The host switching power supply provides electrical energy to all host components;

[0010] The main PLC is connected to the human-machine interface and the collective doffing PLC via RS485. The main PLC is connected to the main spindle motor, main spindle brake device, cotton suction fan and cleaner motor required by the ring spinning machine to complete the spinning operation. The main PLC controls the main spindle motor, main spindle brake device, cotton suction fan and cleaner motor required by the ring spinning machine to complete the spinning operation. The main PLC receives the signal sent by the collective doffing PLC and sends the signal to the human-machine interface. The parameters set in the human-machine interface are distinguished by different PLC communication numbers, and different parameter information is sent to the main PLC and the collective doffing PLC respectively.

[0011] The ring rail frequency converter is connected to the human-machine interface via RS485. The information of the ring rail frequency converter is displayed on the human-machine interface, and parameters are set to control the operation of the ring rail frequency converter. The ring rail control system also includes a ring rail motor and a ring rail motor braking device. The ring rail motor is controlled by the ring rail frequency converter. The ring rail motor drives the ring rail to move up and down. The ring rail motor braking device brakes the ring rail motor to stop the ring rail from moving.

[0012] Furthermore, the collective doffing switching power supply is equipped with a collective doffing transformer, which converts 380V AC power into 220V AC power and outputs it to the collective doffing switching power supply.

[0013] Furthermore, the collective doffing element also includes a collective doffing servo driver, a collective doffing circuit breaker, a collective doffing contactor, and a solid-state relay controlled by a collective doffing PLC. The collective doffing servo driver is connected to a servo motor, controlling the motor's operation and stop. The collective doffing circuit breaker includes three-phase, two-phase, and single-phase circuit breakers. Three-phase circuit breakers are connected to the servo motor, the empty tube lifting motor, and the full yarn lifting motor, with multiple three-phase circuit breakers configured according to power and current specifications. The servo motor, empty tube lifting motor, and full yarn lifting motor are respectively protected by circuit protection. A two-phase circuit breaker is connected to the collective doffing transformer to protect the collective doffing transformer, and a single-phase circuit breaker protects the collective doffing switching power supply. The servo motor and the full yarn lifting motor are each equipped with the aforementioned collective doffing contactor, and multiple collective doffing contactors control the energization and de-energization of the servo motor and the full yarn lifting motor respectively. A solid-state relay is connected to the empty tube lifting motor to control the energization and de-energization of the empty tube lifting motor.

[0014] Furthermore, the host switching power supply is equipped with a host transformer, which converts 380V AC power into 220V AC power and outputs it to the host switching power supply.

[0015] Furthermore, the main unit components also include a main unit PLC-controlled three-phase circuit breaker, a main unit two-phase circuit breaker, a main unit single-phase circuit breaker, a bridge rectifier stack, and main unit contactors. The cotton suction fan and the cleaner motor are each connected to a main unit three-phase circuit breaker, which protects the cotton suction fan and the cleaner motor respectively. The main unit two-phase circuit breaker is connected to the main unit transformer, protecting the main unit transformer. The main unit single-phase circuit breaker protects the main unit switching power supply. The bridge rectifier stack is connected to the main shaft brake device, supplying power to the main shaft brake device through the bridge rectifier stack. The cotton suction fan, the cleaner motor, the main shaft brake device, and the steel collar brake device are all connected to main unit contactors, which control the energizing and de-energizing of the cotton suction fan, the cleaner motor, the main shaft brake device, and the steel collar brake device respectively.

[0016] A method for controlling collective doffing of a ring spinning frame, applicable to the aforementioned collective doffing control system for a ring spinning frame, wherein the control method is as follows:

[0017] S1: Turn on the main power supply and the collective doffing power supply. The main power supply provides power to the main components, and the collective doffing power supply provides power to the collective doffing components and the ring plate frequency converter. At the same time, set different parameters on the human-machine interface. These parameters are distinguished by different PLC communication numbers, and these different parameter information are sent to the main PLC, the collective doffing PLC and the ring plate frequency converter respectively.

[0018] S2: After receiving the signal, the host PLC controls the cotton suction fan to start running, and then controls the spinning machine main shaft motor to start running. The spinning machine main shaft motor drives the spinning machine main shaft to run, so that the spinning machine starts spinning. During this process, the cotton suction fan provides negative pressure to the yarn.

[0019] S3: The host PLC sends the signal of the spinning machine spindle operation to the human-machine interface for display. The human-machine interface sends the signal to the ring plate frequency converter and sends the parameters of full yarn position, lower limit position and the up and down movement speed of the ring plate set on the human-machine interface to the ring plate frequency converter. After receiving the signal, the ring plate frequency converter controls the ring plate motor to drive the ring plate to move up gradually. At the same time, the ring plate frequency converter sends the signal to the human-machine interface for display.

[0020] S4: When the ring board frequency converter controls the ring board motor to drive the ring board to move up to the highest full yarn position, the ring board frequency converter quickly lowers the ring board to the lower limit position through the ring board motor. When the ring board motor drives the ring board to move to the lower limit position, the main PLC controls the ring board braking device to brake the ring board motor, so that the ring board stops moving. The ring board frequency converter sends the signal that the ring board has stopped moving to the main PLC through the human-machine interface. After receiving the signal, the main PLC controls the main shaft braking device to brake the main shaft of the spinning machine, so that the spinning machine stops spinning. Then the main PLC controls the cotton suction fan to stop running. The main components and the ring board control system stop running. The main PLC sends the signal that the main components have stopped running to the collective doffing PLC and the human-machine interface.

[0021] S5: After receiving the spindle stop signal from the host PLC, the collective doffing PLC controls the solenoid valve to flip up the guide plate. The collective doffing PLC controls the servo motor to drive the collective doffing device to move up and down through the collective doffing servo driver. At the same time, the collective doffing PLC controls the inward and outward swing of the herringbone arm and the air inflation and deflation of the tube gripper through multiple solenoid valves. Through the combined action of the collective doffing device, the herringbone arm and the tube gripper, the fully spun spinning bobbin is removed and placed on the cam below the spinning machine. Then the empty spinning bobbin is moved from the bottom of the spinning machine to the top and inserted into each spindle. After that, the collective doffing PLC controls the solenoid valve to lower the guide plate. During this process, the collective doffing PLC sends a signal to the human-machine interface for display.

[0022] S6: The collective doffing PLC sends a signal to the main PLC indicating that the guide plate has fallen. Upon receiving the signal, the main PLC controls the cotton suction fan and the main shaft motor of the spinning machine to run. The main shaft motor drives the spinning machine to start running, ensuring automatic spinning. While the main shaft is running, the main PLC sends a signal to the ring rail frequency converter through the human-machine interface. The ring rail frequency converter controls the ring rail motor to drive the ring rail to gradually move upward. Simultaneously, while the spinning machine is spinning, the collective doffing PLC controls the full yarn lifting motor at the rear of the spinning machine to remove the full spinning bobbin from the cam below the spinning machine and place it outside the spinning machine. By controlling the empty bobbin lifting motor at the rear of the spinning machine, the empty spinning bobbin is placed back on the cam, preparing for the next collective doffing.

[0023] Furthermore, in step S1, the input voltage of the external power supply is converted into the voltage output required by the host switching power supply through the host transformer. The host switching power supply converts the voltage output by the host transformer into the voltage output required by the host components. The host PLC controls the energization of the suction fan, cleaner motor, main shaft brake device, and steel collar plate motor brake device through multiple host contactors. At the same time, the host PLC supplies power to the main shaft brake device through a bridge rectifier. During this process, the host transformer is protected by a host two-phase circuit breaker, the host switching power supply is protected by a single-phase circuit breaker, and the suction fan and cleaner motor are protected by multiple host three-phase circuit breakers.

[0024] The input voltage of the external power supply is converted into the voltage output required by the collective doffing transformer. The collective doffing switching power supply converts the voltage output of the collective doffing transformer into the voltage output required by the collective doffing components. The collective doffing PLC controls the servo motor and the full-yarn lifting motor through multiple collective doffing contactors. The collective doffing PLC controls the empty tube lifting motor through solid-state relays. During this process, the collective doffing transformer is protected by a two-phase circuit breaker, the collective doffing switching power supply is protected by a single-phase circuit breaker, and the servo motor, the empty tube lifting motor, and the full-yarn lifting motor are protected by multiple three-phase circuit breakers.

[0025] Furthermore, in step S4, after the host PLC controls the suction fan to stop running through the host contactor, the host PLC controls the cleaner motor, the main shaft brake device, and the steel ring plate motor brake device to de-energize through multiple host contactors, so that the cleaner motor, the main shaft brake device, and the steel ring plate motor brake device stop running. At the same time, the host PLC sends a stop signal to the steel ring plate frequency converter through the human-machine interface, and the steel ring plate frequency converter controls the steel ring plate motor to stop running.

[0026] Furthermore, in step S5, the signal transmission between the main PLC and the collective doffing PLC includes: when the spinning machine performs collective doffing, the main PLC sends a signal to the collective doffing PLC, which controls the collective doffing element to start running. At the moment when the collective doffing device of the collective doffing element fully draws the spinning bobbin, the collective doffing PLC sends a signal to the main PLC. The main PLC controls the main shaft braking device to brake the spinning machine main shaft through the bridge rectifier and the main contactor. The main PLC controls the main shaft braking to prevent the main shaft from reversing when fully drawn. After receiving the signal from the collective doffing PLC that the guide plate has fallen, the main PLC controls the main shaft braking device to release the restriction on the spinning machine main shaft, allowing the spinning machine to start the next doffing. At the same time, the main PLC sends a signal to the collective doffing PLC during the spinning process, and the collective doffing PLC controls the solenoid valve to keep the guide plate in the fallen state.

[0027] Furthermore, in step S5, the collective doffing PLC sends the alarm information of the collective doffing element during the collective doffing process of the ring spinning machine to the host PLC, and the host PLC sends the alarm information to the human-machine interface for display.

[0028] The beneficial effects of this invention are as follows: By setting different parameters through the human-machine interface, these different parameter information are distinguished by different PLC communication station numbers. The different parameter information is sent to the main unit and the collective doffing unit respectively, realizing an effective control method for completing the collective doffing modification using the original human-machine interface and main unit of the ring spinning machine. This greatly reduces the modification cost. A ring rail frequency converter is added to drive the ring rail motor, realizing the variable frequency speed regulation function of the ring rail. Furthermore, the original control and display style of the human-machine interface is preserved to the greatest extent, allowing operators to conveniently and quickly operate the modified ring spinning machine and avoid machine malfunctions and shutdowns due to operational errors. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the framework of the collective doffing control system of the present invention;

[0031] Figure 2 This is a schematic diagram of the frame of the collective doffing element of the present invention;

[0032] Figure 3This is a schematic diagram of the frame of the host component of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Since there are many ring spinning machines without collective doffing devices, the cost of modifying these machines is high. Furthermore, the human-machine interface (HMI) style of the control system in the modified ring spinning machine differs significantly from the original HMI style, making it difficult for operators to master the operation of the collective doffing device and easily leading to machine malfunctions and shutdowns due to operational errors. Therefore, the inventors of this application provide a collective doffing control system and method for ring spinning machines. This system effectively utilizes the original HMI and main components of the ring spinning machine while adding the necessary control components for collective doffing, greatly reducing modification costs. At the same time, it does not change the original HMI display style, allowing operators to quickly and accurately operate the modified ring spinning machine.

[0036] like Figure 1As shown, a collective doffing control system for a ring spinning frame includes: a collective doffing element 2, a main unit 1, a ring rail control system 3, and a human-machine interface 4. The ring rail control system 3 mainly includes a ring rail frequency converter 303 that controls the operation of the ring rail in the spinning frame. The main unit 1 receives signals sent by the collective doffing element 2 and sends control signals to the collective doffing element 2. The human-machine interface 4 receives signals sent by the main unit 1 and the collective doffing element 2, and controls the main unit 1, the collective doffing element 2, and the ring rail frequency converter 303 through the human-machine interface 4.

[0037] The ring bar frequency converter 303 is connected to the human-machine interface 4 via RS485. The information of the ring bar frequency converter 303 is displayed on the human-machine interface 4, and parameters are set on the human-machine interface 4 to control the operation of the ring bar frequency converter 303. The ring bar control system 3 also includes a ring bar motor 301 and a ring bar motor braking device 302. The ring bar motor 301 is controlled by the ring bar frequency converter 303. The ring bar motor 301 drives the ring bar to move up and down. During the spinning process, the yarn is evenly wound on the spinning bobbin by gradually moving the ring bar upward. The ring bar motor braking device 302 brakes the ring bar motor 301 to stop the ring bar from moving.

[0038] Based on the above embodiments, the parameters set by the human-machine interface 4 are distinguished by different PLC communication station numbers, and different parameter information is sent to the host component 1 and the collective doffing component 2 respectively. This realizes an effective control method for completing the collective doffing modification using the original human-machine interface 4 and host component 1 of the ring spinning machine, which greatly reduces the modification cost. A ring plate frequency converter 303 is added to drive the ring plate motor 301, realizing the variable frequency speed regulation function of the ring plate. At the same time, the original control and display style of the human-machine interface 4 is preserved to the greatest extent, making it convenient and quick for the staff to operate the modified ring spinning machine.

[0039] In this embodiment, as Figure 2 As shown, the collective doffing element 2 includes a servo motor 204 and multiple solenoid valves 203 required for the ring spinning machine to complete the collective doffing action. The multiple solenoid valves 203 control the rotation of the yarn guide plate, the inward and outward swing of the herringbone arm, and the inflation and deflation of the tube gripper, respectively. The servo motor 204 drives the collective doffing device to move the spinning bobbin up and down. The collective doffing element also includes a collective doffing switching power supply 201 and a collective doffing PLC 202.

[0040] The collective doffing switching power supply 201 is connected to the control terminals of the ring rail inverter 303. The collective doffing switching power supply 201 converts the input 220V AC power to 24V, providing power to the entire collective doffing element 2. Simultaneously, the collective doffing switching power supply 201 provides power to the ring rail inverter 303 through its 24V control terminals. The collective doffing switching power supply 202 is equipped with a collective doffing transformer 207, which converts 380V AC power to 220V AC power and outputs it to the collective doffing switching power supply 202. The collective doffing PLC 202... The collective doffing PLC 202 is connected to the main component 1 via RS485, and is also connected to multiple solenoid valves 203 and servo motors 204. The collective doffing PLC 202 is also connected to an empty tube lifting motor 205 and a full yarn lifting motor 206. The collective doffing PLC 202 controls the servo motors 204 and multiple solenoid valves 203 to complete the doffing action of the ring spinning machine. The collective doffing PLC 202 controls the full yarn lifting motor 206 to remove the full yarn spinning bobbin from the spinning machine. The collective doffing PLC 202 controls the empty tube lifting motor 205 to place the empty spinning bobbin on the spinning machine.

[0041] Specifically, the collective doffing element 2 also includes a collective doffing servo driver 208, a collective doffing circuit breaker 209, a collective doffing contactor 210, and a solid-state relay 211 controlled by the collective doffing PLC 202. The collective doffing servo driver 208 is connected to the servo motor 204, and controls the operation and stop of the servo motor 204 through the collective doffing servo driver 208. The collective doffing circuit breaker 209 includes a three-phase circuit breaker 209-1, a two-phase circuit breaker 209-2, and a single-phase circuit breaker 209-3. Among them, the servo motor 204, the empty tube lifting motor 205, and the full yarn lifting motor 206 are all connected to the three-phase circuit breaker 209-1. The multiple three-phase circuit breakers 209-1 are classified according to power and current specifications. Do not provide circuit protection for servo motor 204, empty tube lifting motor 205, and full yarn lifting motor 206. Two-phase circuit breaker 209-2 is connected to collective doffing transformer 207, and collective doffing transformer 207 is protected through two-phase circuit breaker 209-2. Single-phase circuit breaker 209-3 protects collective doffing switching power supply 201. Servo motor 204 and full yarn lifting motor 206 are each equipped with collective doffing contactor 210. Multiple collective doffing contactors 210 control the servo motor 204 and full yarn lifting motor 206 to turn on and off respectively. Solid-state relay 211 is connected to empty tube lifting motor 205, and the empty tube lifting motor 205 is controlled to turn on and off through solid-state relay 211.

[0042] Based on the above embodiments, the collective doffing PLC 202 comprehensively controls the solenoid valve 203, servo motor 204, empty tube lifting motor 205, and full yarn lifting motor 206 required for the ring spinning machine to complete the collective doffing action, ensuring that the spinning machine can automatically perform the collective doffing process. The collective doffing device that drives the spinning bobbin to move up and down, the herringbone arm that drives the spinning bobbin to swing in and out, and the bobbin gripper that grips the spinning bobbin by inflating and deflating air are all commonly used devices in existing spinning machines, and are not specifically described in this invention.

[0043] In this embodiment, as Figure 3 As shown, the main component 1 includes a main shaft motor 103, a main shaft brake device 104, a cotton suction fan 105, and a cleaner motor 106 required for the ring spinning machine to complete the spinning operation. The main shaft motor 103 drives the main shaft of the ring spinning machine to run, enabling the ring spinning machine to spin yarn. The main shaft brake device 104 brakes the main shaft of the ring spinning machine to stop spinning. During the spinning process, the cotton suction fan 105 provides negative pressure to the yarn, and the cleaner motor 106 cleans the ring spinning machine. The main component 1 also includes a main power supply 101 and a main PLC 102.

[0044] The main power supply 101 provides power to the entire main component 1. The main power supply 101 is equipped with a main transformer 107, which converts 380V AC power to 220V AC power and outputs it to the main power supply 101. The main PLC 102 is connected to the human-machine interface 4 and the collective doffing PLC 202 via RS485. The main PLC 102 works with the ring spinning machine's main shaft motor 103, main shaft brake device 104, and cotton suction fan 105 to complete the spinning operation. The main spindle motor 103, main spindle brake device 104, cotton suction fan 105 and cleaner motor 106 of the ring spinning machine are controlled by the host PLC 102 to complete the spinning operation. The host PLC 102 receives the signal sent by the collective doffing PLC 202 and sends the signal to the human-machine interface 4. The parameters set in the human-machine interface 4 are distinguished by different PLC communication numbers, and different parameter information is sent to the host PLC 102 and the collective doffing PLC 202 respectively.

[0045] Specifically, the main unit 1 also includes a main unit three-phase circuit breaker 108, a main unit two-phase circuit breaker 109, a main unit single-phase circuit breaker 110, a bridge rectifier stack 111, and a main unit contactor 112 controlled by the main unit PLC 102. The cotton suction fan 105 and the cleaner motor 106 are both connected to the main unit three-phase circuit breaker 108. Multiple main unit three-phase circuit breakers 108 respectively protect the cotton suction fan 105 and the cleaner motor 106. The main unit two-phase circuit breaker 109 is connected to the main unit transformer 107, and the main unit two-phase circuit breaker 109 controls the main unit transformer 107. For protection, the main unit single-phase circuit breaker 110 protects the main unit switching power supply 101; the bridge rectifier stack 111 is connected to the main shaft brake device 104, and supplies power to the main shaft brake device 104 through the bridge rectifier stack 111; the cotton suction fan 105, the cleaner motor 106, the main shaft brake device 104 and the steel collar brake device 302 are all connected to the main unit contactor 112, and the multiple main unit contactors 112 control the energization and de-energization of the cotton suction fan 105, the cleaner motor 106, the main shaft brake device 104 and the steel collar motor brake device 302 respectively.

[0046] Based on the above embodiment, the host PLC102 is the core control component for the operation of the host components. In order to facilitate the rapid adaptation of the staff after the collective doffing modification of the spinning machine, the host PLC102 still uses the existing motion control and production statistics program, and only makes the necessary program modifications for sending and receiving relevant signals from the collective doffing PLC202.

[0047] like Figure 1-3 As shown, a method for controlling the collective doffing of a ring spinning frame is applicable to the aforementioned control system for the collective doffing of a ring spinning frame. The control method is as follows:

[0048] S1: Turn on the main power supply 101 and the collective doffing power supply 201. The main power supply 101 provides power to the main component 1. The input voltage of the external power supply is converted into the voltage output required by the main power supply 101 through the main transformer 107. The main power supply 101 converts the voltage output by the main transformer into the voltage output required by the main component 1. The main PLC 102 controls the cotton suction fan 105, the cleaner motor 106, the main shaft brake device 104, and the steel ring plate motor brake device 302 to be energized through multiple main contactors 112. At the same time, the main PLC 102 supplies power to the main shaft brake device 104 through the bridge rectifier 111. During this process, the main transformer 107 is protected by the main two-phase circuit breaker 109, the main power supply 101 is protected by the single-phase circuit breaker 110, and the cotton suction fan 105 and the cleaner motor 106 are protected by multiple main three-phase circuit breakers 108.

[0049] The collective doffing switching power supply 201 provides power to the collective doffing element 2 and the ring rail frequency converter 303. The collective doffing transformer 207 converts the input voltage of the external power supply into the voltage output required by the collective doffing switching power supply 201. The collective doffing switching power supply 201 converts the voltage output of the collective doffing transformer 207 into the voltage output required by the collective doffing element 2. The collective doffing PLC 202 controls the servo motor 204 and the full-yarn lifting motor 206 to power through multiple collective doffing contactors 210. The collective doffing PLC 202 controls the empty tube lifting motor 205 to power through a solid-state relay 211. During this process, the collective doffing transformer 207 is protected by a two-phase circuit breaker 209-2, the collective doffing switching power supply 201 is protected by a single-phase circuit breaker 209-3, and the servo motor 204, the empty tube lifting motor 205, and the full-yarn lifting motor 206 are protected by multiple three-phase circuit breakers 209-1.

[0050] At the same time, different parameters are set on the human-machine interface 4. These parameters are distinguished by different PLC communication numbers, and these different parameter information are sent to the host PLC 102, the collective doffing PLC 202 and the steel ring plate frequency converter 303 respectively.

[0051] S2: After receiving the signal, the host PLC102 controls the cotton suction fan 105 to start running, and then controls the spinning machine main shaft motor 103 to start running through the host PLC202. The spinning machine main shaft motor 103 drives the spinning machine main shaft to run, so that the spinning machine starts spinning. During this process, the cotton suction fan 105 provides negative pressure to the yarn.

[0052] S3: The host PLC102 sends the signal of the spinning machine spindle operation to the human-machine interface 4 for display. The human-machine interface 4 sends the signal to the ring rail frequency converter 303 and sends the parameters of full yarn position, lower limit position and the up and down movement speed of the ring rail set on the human-machine interface 4 to the ring rail frequency converter 303. After receiving the signal, the ring rail frequency converter 303 controls the ring rail motor 301 to drive the ring rail to move gradually upward. At the same time, the ring rail frequency converter 303 sends the signal to the human-machine interface 4 for display.

[0053] S4: When the ring board frequency converter 303 controls the ring board motor 301 to drive the ring board to move up to the highest full yarn position, the ring board frequency converter 303 quickly lowers the ring board to the lower limit position through the ring board motor 301. When the ring board motor 301 drives the ring board to move to the lower limit position, the host PLC 202 controls the ring board brake device 302 to brake the ring board motor 301, so that the ring board stops moving. The ring board frequency converter 303 sends the signal that the ring board stops moving to the host PLC 102 through the human-machine interface 4. After receiving the signal, the host PLC 102 controls the spindle brake device 104 to brake the spindle of the spinning machine, so that the spinning machine stops spinning. Then the host PLC 102 controls the cotton suction fan 105 to stop running. The host component 1 and the ring board control system 3 stop running. The host PLC 102 sends the signal that the host component 1 stops running to the collective doffing PLC 202 and the human-machine interface 4.

[0054] During this process, after the main PLC 102 controls the suction fan 105 to stop running through the main contactor 112, the main PLC 102 controls the cleaner motor 106, the main shaft brake device 104, and the steel ring plate motor brake device 302 to cut off power through multiple main contactors 112, so that the cleaner motor 106, the main shaft brake device 104, and the steel ring plate motor brake device 302 stop running. At the same time, the main PLC 102 sends a stop signal to the steel ring plate frequency converter 303 through the human-machine interface 4, and the steel ring plate frequency converter 303 controls the steel ring plate motor 301 to stop running.

[0055] S5: After receiving the spindle stop signal sent by the host PLC102, the collective doffing PLC202 controls the solenoid valve 203 to flip up the guide plate. The collective doffing PLC202 controls the servo motor 204 to drive the collective doffing device to move up and down through the collective doffing servo driver 208. At the same time, the collective doffing PLC202 controls the inward and outward swing of the herringbone arm and the inflation and deflation of the tube gripper through multiple solenoid valves 203. Through the combined action of the collective doffing device, the herringbone arm and the tube gripper, the fully spun spinning bobbin is removed and placed on the cam below the spinning machine. Then the empty spinning bobbin is moved from the bottom of the spinning machine to the top and inserted into each spindle. After that, the collective doffing PLC202 controls the solenoid valve 203 to lower the guide plate. During this process, the collective doffing PLC202 sends a signal to the human-machine interface 4 for display.

[0056] The signal transmission between the main PLC 102 and the collective doffing PLC 202 includes: when the spinning frame performs collective doffing, the main PLC 102 sends a signal to the collective doffing PLC 202, which controls the collective doffing element 2 to start operating. At the instant the collective doffing device of the collective doffing element 2 fully draws the spinning bobbin, the collective doffing PLC 202 sends a signal to the main PLC 102. The main PLC 102, through the bridge rectifier 111 and the main contactor 112, controls the main shaft braking device 104 to brake the main shaft of the spinning frame. The main PLC 102 controls the main shaft braking of the spinning frame to prevent the main shaft from being fully drawn when the yarn is fully drawn. Reverse; After receiving the signal from the collective doffing PLC 202 that the guide plate has fallen, the main PLC 102 controls the main shaft brake device 104 to release the restriction on the main shaft of the spinning machine, allowing the spinning machine to start the next doffing. At the same time, during the spinning process, the main PLC 102 sends a signal to the collective doffing PLC 202, which controls the solenoid valve 203 to keep the guide plate in the fallen state. Simultaneously, the collective doffing PLC 202 sends the alarm information of the collective doffing element 2 during the collective doffing process of the ring spinning machine to the main PLC 102, which then sends the alarm information to the human-machine interface 4 for display.

[0057] S6: The collective doffing PLC202 sends a signal to the host PLC102 indicating that the yarn guide plate has fallen. Upon receiving the signal, the host PLC102 controls the cotton suction fan 105 and the ring spinning machine main shaft motor 103 to run. The ring spinning machine main shaft motor 103 drives the ring spinning machine main shaft to start running, ensuring automatic spinning. Simultaneously, the host PLC102 sends a signal to the ring rail frequency converter 303 via the human-machine interface 4. The ring rail frequency converter 303 controls the ring rail motor 301 to run, enabling… The ring bar motor 301 drives the ring bar to gradually move upward, at which point the ring spinning machine begins the next spinning cycle. Meanwhile, the collective doffing PLC 202 controls the full yarn lifting motor 206 located at the rear of the spinning machine to remove the full spinning bobbin from the cam below the spinning machine and place it outside the spinning machine. By controlling the empty bobbin lifting motor 205 at the rear of the spinning machine, the empty spinning bobbin is placed back on the cam, preparing for the next collective doffing of the spinning machine.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 collective doffing control system for a ring spinning frame, characterized in that, include: The system includes a collective doffing element, a main unit, a ring rail control system, and a human-machine interface. The ring rail control system mainly includes a ring rail frequency converter that controls the operation of the ring rail in the spinning frame. The main unit receives signals sent by the collective doffing element and sends control signals to the collective doffing element. The human-machine interface receives signals sent by the main unit and the collective doffing element and controls the main unit, the collective doffing element, and the ring rail frequency converter through the human-machine interface. The collective doffing element includes a servo motor and multiple solenoid valves required for the ring spinning machine to complete the collective doffing action. The multiple solenoid valves control the rotation of the yarn guide plate, the inward and outward swing of the herringbone arm, and the inflation and deflation of the bobbin gripper. The servo motor drives the collective doffing device to move the spinning bobbin up and down. The collective doffing element also includes: The collective doffing switching power supply is connected to the control terminals of the ring plate frequency converter. The collective doffing switching power supply converts the input 220V AC power to 24V and provides power to the entire collective doffing element. At the same time, the collective doffing switching power supply provides power to the ring plate frequency converter through the 24V control terminals of the ring plate frequency converter. The collective doffing PLC is connected to the main unit via RS485. The collective doffing PLC is connected to multiple solenoid valves and servo motors. At the same time, the collective doffing PLC is also connected to the empty tube lifting motor and the full yarn lifting motor. The collective doffing PLC controls multiple solenoid valves and servo motors to complete the doffing action of the ring spinning machine. The collective doffing PLC controls the full yarn lifting motor to remove the full yarn spinning bobbin from the spinning machine. The collective doffing PLC controls the empty tube lifting motor to place the empty spinning bobbin on the spinning machine. The main components include a main shaft motor, a main shaft brake, a cotton suction fan, and a cleaner motor required for the ring spinning machine to complete the spinning operation. The main shaft motor drives the main shaft of the ring spinning machine to spin yarn, and the main shaft brake quickly brakes the main shaft to stop the spinning machine. During the spinning process, the cotton suction fan provides negative pressure to the yarn, and the cleaner motor cleans the ring spinning machine simultaneously. The main components also include: The host switching power supply provides electrical energy to all host components; The main PLC is connected to the human-machine interface and the collective doffing PLC via RS485. The main PLC is connected to the main spindle motor, main spindle brake device, cotton suction fan and cleaner motor of the ring spinning machine to complete the spinning operation. The main PLC controls the main spindle motor, main spindle brake device, cotton suction fan and cleaner motor of the ring spinning machine to complete the spinning operation. The main PLC receives the signal sent by the collective doffing PLC and sends the signal to the human-machine interface. The parameters set in the human-machine interface are distinguished by different PLC communication numbers, and different parameter information is sent to the main PLC, the collective doffing PLC and the ring rail frequency converter respectively. The steel ring plate frequency converter is connected to the human-machine interface via RS485. The information of the steel ring plate frequency converter is displayed on the human-machine interface, and parameters are set on the human-machine interface to control the operation of the steel ring plate frequency converter. The steel ring plate control system also includes a steel ring plate motor and a steel ring plate motor braking device. The steel ring plate motor is controlled by the steel ring plate frequency converter. The steel ring plate motor drives the steel ring plate to move up and down. The steel ring plate motor braking device brakes the steel ring plate motor to stop the steel ring plate from moving. The collective doffing switching power supply is equipped with a collective doffing transformer, which converts 380V AC power into 220V AC power and outputs it to the collective doffing switching power supply. The collective doffing element also includes a collective doffing servo driver, a collective doffing circuit breaker, a collective doffing contactor, and a solid-state relay controlled by a collective doffing PLC. The collective doffing servo driver is connected to the servo motor and controls its operation and stop. The collective doffing circuit breaker includes three-phase, two-phase, and single-phase circuit breakers. Three-phase circuit breakers are connected to the servo motor, the empty tube lifting motor, and the full yarn lifting motor, respectively, according to their power and current specifications. Two-phase circuit breakers are connected to the collective doffing transformer and protect it. Single-phase circuit breakers protect the collective doffing switching power supply. The collective doffing contactor is installed on both the servo motor and the full yarn lifting motor, and multiple contactors control their energization and de-energization. The solid-state relay is connected to the empty tube lifting motor and controls its energization and de-energization.

2. The collective doffing control system for a ring spinning frame according to claim 1, characterized in that, The host switching power supply is equipped with a host transformer, which converts 380V AC power into 220V AC power and outputs it to the host switching power supply.

3. The collective doffing control system for a ring spinning frame according to claim 2, characterized in that, The main unit also includes a main unit three-phase circuit breaker, a main unit two-phase circuit breaker, a main unit single-phase circuit breaker, a bridge rectifier stack, and main unit contactors, all controlled by the main unit PLC. The cotton suction fan and the cleaner motor are each connected to a main unit three-phase circuit breaker, which protects the cotton suction fan and the cleaner motor respectively. The main unit two-phase circuit breaker is connected to the main unit transformer, protecting the transformer. The main unit single-phase circuit breaker protects the main unit switching power supply. The bridge rectifier stack is connected to the main shaft brake device, supplying power to the main shaft brake device. The cotton suction fan, the cleaner motor, the main shaft brake device, and the steel collar plate motor brake device are all connected to main unit contactors, which control the energizing and de-energizing of these devices respectively.

4. A method for controlling collective doffing on a ring spinning frame, characterized in that, The control method is applicable to the collective doffing control system of a ring spinning frame as described in any one of claims 1-3, and the control method is as follows: S1: Turn on the main power supply and the collective doffing power supply. The main power supply provides power to the main components, and the collective doffing power supply provides power to the collective doffing components and the ring plate frequency converter. At the same time, set different parameters on the human-machine interface. These parameters are distinguished by different PLC communication numbers, and these different parameter information are sent to the main PLC, the collective doffing PLC and the ring plate frequency converter respectively. S2: After receiving the signal, the host PLC controls the cotton suction fan to start running, and then controls the spinning machine main shaft motor to start running. The spinning machine main shaft motor drives the spinning machine main shaft to run, so that the spinning machine starts spinning. During this process, the cotton suction fan provides negative pressure to the yarn. S3: The host PLC sends the signal of the spinning machine spindle operation to the human-machine interface for display. The human-machine interface sends the signal to the ring plate frequency converter and sends the parameters of the ring plate full yarn position, lower limit position and the up and down movement speed of the ring plate set on the human-machine interface to the ring plate frequency converter. After receiving the signal, the ring plate frequency converter controls the ring plate motor to drive the ring plate to move gradually upward. At the same time, the ring plate frequency converter sends the signal to the human-machine interface for display. S4: When the ring board frequency converter controls the ring board motor to drive the ring board to move up to the highest full yarn position, the ring board frequency converter quickly lowers the ring board to the lower limit position through the ring board motor. When the ring board motor drives the ring board to move to the lower limit position, the host PLC controls the ring board motor braking device to brake the ring board motor, so that the ring board stops moving. The ring board frequency converter sends the signal that the ring board has stopped moving to the host PLC through the human-machine interface. After receiving the signal, the host PLC controls the main shaft braking device to brake the main shaft of the spinning machine, so that the spinning machine stops spinning. Then the host PLC controls the cotton suction fan to stop running. The host components and the ring board control system stop running. The host PLC sends the signal that the host components have stopped running to the collective doffing PLC and the human-machine interface. S5: After receiving the signal from the main PLC that the main component has stopped running, the collective doffing PLC controls the solenoid valve to flip up the guide plate. The collective doffing PLC controls the servo motor to drive the collective doffing device to move up and down through the collective doffing servo driver. At the same time, the collective doffing PLC controls the inward and outward swing of the herringbone arm and the inflation and deflation of the tube gripper through multiple solenoid valves. Through the combined action of the collective doffing device, the herringbone arm and the tube gripper, the fully spun spinning bobbin is removed and placed on the cam below the spinning machine. Then the empty spinning bobbin is moved from the bottom of the spinning machine to the top and inserted into each spindle. After that, the collective doffing PLC controls the solenoid valve to lower the guide plate. During this process, the collective doffing PLC sends a signal to the human-machine interface for display. S6: The collective doffing PLC sends a signal to the main PLC indicating that the yarn guide plate has fallen. Upon receiving the signal, the main PLC controls the cotton suction fan and the main shaft motor of the spinning machine to run. The main shaft motor drives the spinning machine to start running, ensuring that the spinning machine can automatically spin yarn. While the spinning machine main shaft is running, the main PLC sends a signal to the ring rail frequency converter through the human-machine interface. The ring rail frequency converter controls the ring rail motor to run, causing the ring rail motor to drive the ring rail to gradually move upward. At the same time as the spinning machine is spinning, the collective doffing PLC controls the full yarn lifting motor at the rear of the spinning machine to remove the full spinning bobbin from the cam below the spinning machine and place the spinning bobbin outside the spinning machine. Then, it controls the empty bobbin lifting motor at the rear of the spinning machine to place the empty spinning bobbin back on the cam, preparing for the next collective doffing of the spinning machine. The external power input voltage is converted into the voltage output required by the collective doffing transformer. The collective doffing switching power supply then converts the voltage output from the collective doffing transformer into the voltage output required by the collective doffing components. The collective doffing PLC controls the servo motor and the full-yarn lifting motor through multiple collective doffing contactors, and controls the empty tube lifting motor through solid-state relays. During this process, the collective doffing transformer is protected by a two-phase circuit breaker, the collective doffing switching power supply is protected by a single-phase circuit breaker, and the servo motor, empty tube lifting motor, and full-yarn lifting motor are protected by multiple three-phase circuit breakers.

5. The method for controlling collective doffing of a ring spinning frame according to claim 4, characterized in that, In step S1, the voltage input from the external power supply is converted into the voltage output required by the host switching power supply through the host transformer. The host switching power supply converts the voltage output from the host transformer into the voltage output required by the host components. The host PLC controls the energization of the suction fan, cleaner motor, main shaft brake device, and steel collar plate motor brake device through multiple host contactors. At the same time, the host PLC supplies power to the main shaft brake device through a bridge rectifier. During this process, the host transformer is protected by a host two-phase circuit breaker, the host switching power supply is protected by a single-phase circuit breaker, and the suction fan and cleaner motor are protected by multiple host three-phase circuit breakers.

6. The method for controlling collective doffing of a ring spinning frame according to claim 5, characterized in that, In step S4, after the host PLC controls the suction fan to stop running through the host contactor, the host PLC controls the cleaner motor, the main shaft brake device, and the steel ring plate motor brake device to de-energize through multiple host contactors, so that the cleaner motor, the main shaft brake device, and the steel ring plate motor brake device stop running. At the same time, the steel ring plate frequency converter controls the steel ring plate motor to stop running.

7. The method for controlling collective doffing of a ring spinning frame according to claim 5, characterized in that, In step S5, the signal transmission between the main PLC and the collective doffing PLC includes: when the spinning machine performs collective doffing, the main PLC sends a signal to the collective doffing PLC, which controls the collective doffing element to start running. At the moment when the collective doffing device of the collective doffing element fully draws the spinning bobbin, the collective doffing PLC sends a signal to the main PLC. The main PLC controls the main shaft braking device to brake the spinning machine main shaft through the bridge rectifier and the main contactor. The main PLC controls the main shaft braking to prevent the main shaft from reversing when fully drawn. After receiving the signal from the collective doffing PLC that the guide plate has fallen, the main PLC controls the main shaft braking device to release the restriction on the spinning machine main shaft, allowing the spinning machine to start the next spinning cycle. At the same time, the main PLC sends a signal to the collective doffing PLC during the spinning process, and the collective doffing PLC controls the solenoid valve to keep the guide plate in the fallen state.

8. The method for controlling collective doffing of a ring spinning frame according to claim 4, characterized in that, In step S5, the collective doffing PLC sends the alarm information of the collective doffing element during the collective doffing process of the ring spinning machine to the host PLC, and the host PLC sends the alarm information to the human-machine interface for display.

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