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CN-122008497-A - Driving control method, system and device for hot runner valve needle of injection mold

CN122008497ACN 122008497 ACN122008497 ACN 122008497ACN-122008497-A

Abstract

The invention discloses a driving control method, a driving control system and a driving control device for a hot runner valve needle of an injection mold, wherein the hot runner valve needle moves up and down along with rotation, so that a hot runner valve needle hole and a glue injection port can be automatically aligned, the defect of glue injection port caused by eccentricity is avoided, the problem of blocking of the hot runner valve needle moving in a hot runner valve needle sleeve caused by the up and down movement is avoided, a hot runner valve needle pressure real-time correction system is used, an adjustable torque is output through an oil pressure gear motor, the thrust of the hot runner valve needle is corrected, and the problems of insufficient thrust and overlarge thrust of the hot runner valve needle caused by unstable thrust are avoided.

Inventors

  • ZHANG BINGLONG

Assignees

  • 杭州八达热流道科技有限公司

Dates

Publication Date
20260512
Application Date
20260416

Claims (10)

  1. 1. The driving control method of the hot runner valve needle of the injection mold is characterized by comprising the following steps of: step S1, system power-on initialization, resetting an electric adjustable overflow valve to an open state to release system oil pressure, and reading a preset target pressure value; S2, receiving an injection glue feeding signal sent by an injection molding machine, controlling an oil way electromagnetic valve to be conducted, driving an oil pressure gear motor to rotate positively, driving an external gear nut fixedly connected with a valve needle to perform anticlockwise spiral ascending motion along a fixed screw rod, enabling the valve needle of a hot runner to synchronously execute rotary linear motion and separate from a glue injection port, and opening a runner; s3, receiving a stop glue injection signal sent by the injection molding machine, switching oil way control, driving an oil pressure gear motor to reversely rotate, driving the external gear nut to make clockwise spiral descending motion along the fixed screw, and enabling the hot runner valve needle to synchronously execute rotary linear motion until the front end of the hot runner valve needle contacts and seals a glue injection port; s4, after the valve needle completes the plugging action, collecting the sealing pressure in real time through a pressure sensor arranged at the driving end to obtain an actual pressure value Paactual; and S5, comparing the Paactual with a preset target pressure value Ptarget in an automatic operation mode, calculating the deviation delta P, and adjusting the output torque of the hydraulic gear motor and correcting the valve needle thrust by adjusting the set pressure of the electric adjustable overflow valve according to the direction and the size of the deviation.
  2. 2. The driving control method of the hot runner valve pin of the injection mold according to claim 1, wherein the step S1 is performed by: A1, immediately outputting a lowest effective signal to an electric adjustable overflow valve by a PLC after the system is electrified and self-inspected, and forcing the valve port of the electric adjustable overflow valve to be fully opened for pressure relief so as to enable a hydraulic circuit to be rapidly reduced to a non-pressure safety state; and step A2, after the relief operation of the overflow valve is completed, the initialization program of the PLC immediately reads the previously stored Ptarget value from the nonvolatile memory of the PLC, and the value is loaded into the working memory of the PLC for the subsequent automatic operation control logic to call at any time.
  3. 3. The driving control method of the hot runner valve pin of the injection mold according to claim 1, wherein the step S2 is performed by: Step B1, signal receiving and identification, a programmable controller continuously monitors an injection glue feeding digital quantity output signal from an injection molding machine control system, the signal is connected to a designated digital input port of a PLC in a hard wiring mode, and when the injection molding machine completes mold closing and enters an injection stage, the controller sets the signal to be high level; Step B2, controlling an oil way electromagnetic valve, immediately executing an output instruction by a PLC after detecting that an injection glue feeding signal is effective, setting a corresponding digital output point in the PLC to be high level, connecting the digital output point to a forward working coil of the oil way direction control electromagnetic valve through hard wiring, and switching to a forward oil supply working position after the electromagnetic valve is electrified; Step B3, hydraulic power is transmitted, after the electromagnetic valve is switched, high-pressure oil liquid output by the hydraulic pump is guided to a forward oil inlet of the oil pressure gear motor, an oil return port of the motor is communicated with the oil tank, and an output shaft of the gear motor starts to rotate forward; And B4, converting mechanical motion, wherein an output shaft of the gear motor drives an external gear nut fixedly connected with the gear motor to rotate, converting the external gear nut into linear motion upwards along the axis of the screw rod, enabling the external gear nut to spirally rise, transmitting the rotation of the external gear nut and the linear compound motion to the valve needle, enabling the valve needle to synchronously execute the rotation linear motion of a spiral track, and enabling the front end of the valve needle to gradually separate from a glue injection port sealing surface flow passage in a hot flow passage nozzle core to be opened.
  4. 4. The driving control method of the hot runner valve pin of the injection mold according to claim 1, wherein the step S3 is performed by: Step C1, signal receiving and recognition, a programmable controller continuously monitors a stop glue injection digital quantity output signal from an injection molding machine control system, the signal is connected to a designated digital input port of a PLC in a hard wiring mode, and when the injection molding machine completes mold closing and enters an injection stage, the controller sets the signal to be high level; step C2, switching the direction of an oil way, and after detecting that a stop glue injection signal is effective, disconnecting a forward oil way electromagnetic valve coil used for starting a valve needle before the PLC, conducting a reverse oil way electromagnetic valve coil, and switching the direction of a hydraulic oil way to enable high-pressure oil to enter from an oil return port of an oil pressure gear motor; step C3, the motor is reversely driven, and under the action of reverse oil pressure, the output shaft of the oil pressure gear motor starts to reversely rotate; And step C4, converting the movement of the screw pair, driving an external gear nut fixedly connected with the motor output shaft to reversely rotate by the motor output shaft, converting the external gear nut into linear descending movement along the axis of the screw rod, forming a clockwise spiral descending track, gradually approaching to and finally closely contacting with the sealing surface of the glue injection port in the nozzle core of the hot runner, and cutting off the flow channel.
  5. 5. The driving control method of the hot runner valve pin of the injection mold according to claim 1, wherein the step S4 is performed by: The pressure sensor collects analog signals of the sealing adhesive thrust pressure in a fixed sampling period, carries out analog-to-digital conversion, converts the analog signals into digital quantities, carries out smoothing treatment on a plurality of continuous sampling values by adopting a digital filtering algorithm, and converts the filtered values into actual pressure values Paactual by a calibration coefficient.
  6. 6. The driving control method of the hot runner valve pin of the injection mold according to claim 1, wherein the step S5 is performed by: Step D1, a PLC firstly detects whether the system is in an automatic operation mode, and reads a target pressure value Ptarget calibrated and stored in a manual debugging stage from a memory after confirmation; D2, calculating deviation, namely after the valve needle completes the plugging action, obtaining an actual pressure value Paactual after filtering treatment by the PLC, and calculating a pressure deviation delta P; step D3, judging a deviation threshold value, judging and comparing the absolute value of the pressure deviation with a pressure tolerance threshold value set by a system, if the pressure deviation is smaller than or equal to the pressure tolerance threshold value, judging that the current sealing force is qualified, otherwise, triggering a pressure correction flow; and D4, generating and adjusting an adjusting instruction, determining an adjusting direction according to the direction of the pressure deviation delta P, reducing the system pressure and reducing the output signal if the pressure deviation delta P is larger than zero, otherwise, increasing the system pressure, increasing the output signal, dynamically adjusting the opening pressure and correcting the valve needle thrust.
  7. 7. A driving control system of a hot runner valve needle of an injection mold, adopting the driving control method of the hot runner valve needle of the injection mold according to any one of claims 1-6, and the driving control system is characterized by comprising a controller module, a hydraulic power module, an oil circuit control module, an execution mechanism module, a pressure feedback module and a pressure regulation module; The controller module is used for initializing and self-checking the system power-on, receiving signals of the injection molding machine, controlling the electromagnetic valve and the overflow valve to output, reading/storing target pressure Ptarget, collecting and processing pressure sensor data, and executing deviation calculation and closed-loop regulation logic; The hydraulic power module is used for providing a stable hydraulic source and driving the gear motor to rotate forwards and backwards; The oil circuit control module is used for switching the direction of an oil circuit according to the PLC instruction and controlling the gear motor to open the valve in a forward rotation mode or close the valve in a reverse rotation mode; the actuating mechanism module is used for converting the rotary motion of the motor into the rotary linear compound motion of the valve needle through the screw pair, so as to realize accurate opening or sealing of the glue injection port; The pressure feedback module is used for collecting the actual thrust pressure Paactual of the valve needle during sealing, and filtering and calibrating the actual thrust pressure Paactual for closed-loop control; And the pressure regulating module is used for fully opening and releasing pressure during power-on, and dynamically regulating the system set pressure according to delta P during operation so as to change the output of the motor.
  8. 8. The driving control device for the injection mold hot runner valve needle is characterized by comprising a mold hot runner plate, wherein a driving system base is arranged on the mold hot runner plate and is fixedly connected with the mold hot runner plate, a valve needle mechanism is arranged on the upper part of the driving system base and is fixedly connected with the driving system base, an oil pressure gear motor is arranged on one side of the driving system base and is fixedly connected with the mold hot runner plate, the oil pressure gear motor is connected with the valve needle mechanism through an oil pressure gear motor transmission shaft and an oil pressure gear motor transmission gear, a runner pipe is arranged on the driving system base and is fixedly connected with the driving system base, a hot nozzle sleeve is arranged on the runner pipe and is fixedly connected with the runner pipe.
  9. 9. The drive control device of the hot runner valve needle of the injection mold according to claim 8, wherein the valve needle mechanism comprises a nut, a screw is arranged in the nut, the screw is in threaded connection with the nut, the screw is fixedly connected with a base of the drive system, the hot runner valve needle is arranged on the nut, the hot runner valve needle is fixedly connected with the nut through a pin, a driven gear is arranged outside the nut, the driven gear is fixedly connected with the nut, a pressure sensor is arranged between the nut and the base of the drive system, and the pressure sensor is fixedly connected with the base of the drive system.
  10. 10. The drive control device for a hot runner valve needle of an injection mold according to claim 8, wherein a runner pipe is arranged at one side of the drive system base, the runner pipe is fixedly connected with the drive system base, and the runner pipe adopts a pipeline type shunt pipe.

Description

Driving control method, system and device for hot runner valve needle of injection mold Technical Field The invention relates to the field of injection molding, in particular to a driving control method, a driving control system and a driving control device for a hot runner valve needle of an injection mold. Background The existing injection mold hot runner valve needle adopts an oil cylinder/air cylinder/servo electric cylinder to drive, and makes linear motion, so that the hot runner valve needle is easy to eccentric, the center cannot be aligned, burrs of a product glue opening are formed, the existing injection mold hot runner valve needle adopts the oil cylinder/air cylinder/electric cylinder to drive, and makes linear motion, so that the hot runner valve needle is easy to be blocked, production is influenced, the existing injection mold hot runner valve needle adopts the oil cylinder/air cylinder to drive, an external system is adopted to drive pressure, the pressure can damage the mold to form bulge because of pressure fluctuation change of an air path or an oil path system, the working pressure of the existing injection mold hot runner valve needle can change due to pressure change of the external air pressure/oil pressure, the pressure change affects the glue sealing thrust of the hot runner valve needle, the production quality is unstable, the existing injection mold hot runner valve needle driving system is arranged on a flow dividing plate, the size is large, the thickness of the existing hot runner adopts the flow dividing plate as a flow dividing scheme of the hot runner system, the cost is high, and the volume is large. In view of the foregoing, there is a need for a method, a system, and a device for controlling driving of a hot runner valve pin of an injection mold to solve the drawbacks of the prior art. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a driving control method, a driving control system and a driving control device for a hot runner valve needle of an injection mold, and aims to solve the problems. In order to achieve the purpose, the invention provides a textile assembly line printing and dyeing parameter control method, which comprises the following steps: step S1, system power-on initialization, resetting an electric adjustable overflow valve to an open state to release system oil pressure, and reading a preset target pressure value; S2, receiving an injection glue feeding signal sent by an injection molding machine, controlling an oil way electromagnetic valve to be conducted, driving an oil pressure gear motor to rotate positively, driving an external gear nut fixedly connected with a valve needle to perform anticlockwise spiral ascending motion along a fixed screw rod, enabling the valve needle of a hot runner to synchronously execute rotary linear motion and separate from a glue injection port, and opening a runner; s3, receiving a stop glue injection signal sent by the injection molding machine, switching oil way control, driving an oil pressure gear motor to reversely rotate, driving the external gear nut to make clockwise spiral descending motion along the fixed screw, and enabling the hot runner valve needle to synchronously execute rotary linear motion until the front end of the hot runner valve needle contacts and seals a glue injection port; s4, after the valve needle completes the plugging action, collecting the sealing pressure in real time through a pressure sensor arranged at the driving end to obtain an actual pressure value Paactual; and S5, comparing the Paactual with a preset target pressure value Ptarget in an automatic operation mode, calculating the deviation delta P, and adjusting the output torque of the hydraulic gear motor and correcting the valve needle thrust by adjusting the set pressure of the electric adjustable overflow valve according to the direction and the size of the deviation. Optionally, the step S1 is implemented by: A1, immediately outputting a lowest effective signal to an electric adjustable overflow valve by a PLC after the system is electrified and self-inspected, and forcing the valve port of the electric adjustable overflow valve to be fully opened for pressure relief so as to enable a hydraulic circuit to be rapidly reduced to a non-pressure safety state; and step A2, after the relief operation of the overflow valve is completed, the initialization program of the PLC immediately reads the previously stored Ptarget value from the nonvolatile memory of the PLC, and the value is loaded into the working memory of the PLC for the subsequent automatic operation control logic to call at any time. Optionally, the step S2 is implemented by: Step B1, signal receiving and identification, a programmable controller continuously monitors an injection glue feeding digital quantity output signal from an injection molding machine control system, the signal is connected to a designated digital input port