Multi-view discharging guide method for extrusion production line

Abstract

According to the multi-view discharging guide method for the extrusion production line, the visual unit is used for judging whether the extruded profile deviates from the center line of the mold or not, intelligent observation after the profile is discharged out of the mold is achieved, meanwhile, self-adaptive matching of the guide value is conducted according to the profile type and the discharging position value change, and the accuracy of the guide value is improved. The method comprises the following steps of: performing real-time dynamic closed-loop adjustment on an adaptive value of guide, accurately guiding an extruded profile under the control of a PLC (Programmable Logic Controller) control system, monitoring an action distance of an action variable-frequency motor in real time in the guide process, and after the action distance is in place, sending a stop signal to the action variable-frequency motor by the PLC control system so as to stop the action variable-frequency motor; therefore, the accuracy and the stability of profile discharging guide of the extrusion production line are guaranteed, and the intelligent level of discharging guide control of the extrusion production line is greatly improved. A control instruction is input to the PLC control system through the HMI, the operation state of the extruded profile is displayed in real time, and remote control over the guiding process is achieved.

Description

Technical Field

[0001] The present invention belongs to a visual collaborative discharging control system for an extruder, and particularly relates to a multi-view discharging guiding method for an extrusion production line. Background Art

[0002] During the extrusion production process of an aluminum profile extrusion production line, especially when a new product is being trial-molded and the profile just exits the die, it is necessary to observe the state of the extruded profile to distinguish whether there are damage phenomena such as "blooming", and at the same time, it is necessary to perform guiding treatment on the up, down, left, and right directions of the profile according to the position where the profile exits the extrusion port so that the center line of the profile is aligned with the center line of the die.

[0003] Currently, for the observation of the discharged profile in the extrusion production line, it is mainly done by personnel standing at the extrusion outlet and observing with their eyes. Since there will be splashing phenomena during discharging, this method has certain safety hazards. When the extruded profile reaches the extrusion outlet, the guiding of the outlet profile is basically achieved by the operator manually adjusting the guiding rollers. This operation is relatively cumbersome, its adaptability and automation level are relatively low, it also occupies human resources, and its accuracy and stability are not high. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-view discharging guiding method for an extrusion production line to overcome the above-mentioned technical problems existing in the prior art.

[0005] To this end, the technical solution provided by the present invention is as follows: A multi-view discharging guiding method for an extrusion production line, comprising the following steps: Step 1) When the extruded profile is extruded from the extrusion outlet of the extruder, the camera in the vision unit moves to the working position, takes a photo of the profile, and transmits the photographed image to the industrial control computer. Through the image processing system of the industrial control computer, the image is compared and analyzed to determine the surface characteristics, external dimensions, and distance from the outlet of the profile, and to judge whether the center line of the profile is aligned with the center line of the die; Step 2) When it is judged that the center line of the profile is not aligned with the center line of the die, the industrial control computer calculates the guiding distance and sends it to the PLC control system; Step 3) The PLC control system converts the guiding distance into the angular displacement of the action variable-frequency motor and sends a signal to drive the action variable-frequency motor to move; Step 4) The movement of the action variable-frequency motor drives the guiding structure to move, and the guiding structure drives the guiding roller to contact the profile and pushes the extruded profile to the position of the center line of the die; Step 5) After the vision unit detects that the center line of the extruded profile coincides with the center line of the die, it sends a signal to the PLC control system. The PLC control system controls the action frequency conversion motor to reset to the initial state, and this alignment ends.

[0006] It also includes inputting control instructions to the PLC control system through the HMI human-machine interface, and real-time displaying the operating state of the extruded profile to achieve remote control of the alignment process.

[0007] Step 4) During the alignment process, the PLC control system monitors the action distance of the action frequency conversion motor in real time. After reaching the position, the PLC control system sends a stop signal to the action frequency conversion motor.

[0008] The vision unit includes a camera, a walking frequency conversion motor, an encoder 1, and an industrial computer. The walking frequency conversion motor, the industrial computer, and the encoder 1 are all electrically connected to the PLC control system; There are two cameras, which are respectively installed above and on one side of the discharge port with a 90° difference. The industrial computer compares and analyzes the images taken by the two cameras through the installed image processing system. The walking frequency conversion motor is used to drive the camera to move, and the encoder 1 is used to detect the walking displacement of the camera in real time.

[0009] When a single alignment action cycle ends until the vision unit detects that the extruded profile is displaced again, the next alignment action cycle is started; After the entire extrusion work process ends, the PLC control system controls the walking frequency conversion motor to act, so that the camera moving to the vision unit returns to the initial position. During the process, the action distance of the walking frequency conversion motor is monitored in real time and fed back to the PLC control system, and the drive stops after reaching the position.

[0010] A driving gear is connected to the rotating shaft of the action frequency conversion motor, and the driving gear meshes with an alignment input gear; the alignment roller is a four-alignment roller or a six-alignment roller.

[0011] The alignment structure includes a moving plate, a housing, and a rotatable disc. The housing is provided with an upper guide groove, and the rotatable disc is provided with a lower guide groove. The input gear of the alignment roller is arranged between the housing and the rotatable disc.

[0012] The four alignment rollers include an upper alignment roller, a lower alignment roller, a left alignment roller, and a right alignment roller. The left alignment roller and the right alignment roller are symmetrically installed on the horizontal center line of the extrusion discharge port, and the upper alignment roller and the lower alignment roller are symmetrically installed on the vertical center line of the extrusion discharge port; The four alignment rollers are respectively fixed on the corresponding moving plates. The upper guide grooves are radially arranged in a 90° dispersion, and the lower guide grooves form a square. Each moving plate is restricted to translational plus rotational motion through the upper guide grooves and the lower guide grooves.

[0013] The six guiding rollers include an upper guiding roller, a lower guiding roller, a left upper guiding roller, a right upper guiding roller, a left lower guiding roller and a right lower guiding roller. The left upper guiding roller and the right upper guiding roller are symmetrically installed above the horizontal center line of the extrusion discharge port. The left lower guiding roller and the right lower guiding roller are symmetrically installed below the horizontal center line of the extrusion discharge port. The upper guiding roller and the lower guiding roller are symmetrically installed on the vertical center line of the extrusion discharge port. The installation of the six guiding rollers forms a regular hexagon. The six guiding rollers are respectively fixed on the corresponding moving plates. The upper guiding grooves are radially arranged in a 60° dispersion, and the lower guiding grooves form a regular hexagon. Each moving plate is restricted to perform translational and rotational motions through the upper guiding grooves and the lower guiding grooves.

[0014] An arc groove of 1 / 4 or 1 / 6 is formed on the housing. The driving rod of the rotatable disk extends out from the arc groove of 1 / 4 or 1 / 6 and is connected to the guiding input gear through a pin hole.

[0015] The beneficial effects of the present invention are as follows: The method of the present invention judges whether the extruded profile deviates from the die center line through the vision unit, realizes the intelligent observation after the profile exits the die, and adaptively matches the guiding value according to the profile type and the change of the discharge position value, and dynamically adjusts the adaptation value of the guiding in real time. Under the control of the PLC control system, the extruded profile is accurately guided, ensuring the accuracy and stability of the profile discharge guiding in the extrusion production line, and greatly improving the intelligent level of the discharge guiding control in the extrusion production line. Brief Description of the Drawings

[0016] Figure 1 is the principle block diagram of the method of the present invention; Figure 2 is the front structure schematic diagram of an implementation manner of the guiding structure in the embodiment of the present invention; Figure 3 is the reverse structure schematic diagram of an implementation manner of the guiding structure in the embodiment of the present invention.

[0017] In the figure: 1, driving gear; 2, action frequency conversion motor; 3, guiding pin shaft; 4, profile; 5, camera; 6, rotatable disk; 7, guiding input gear; 8, guiding roller; 9, moving plate; 10, upper guiding groove; 11, lower guiding groove; 12, housing; 13, traveling frequency conversion motor one; 14, traveling frequency conversion motor two; 15, rack rail. Detailed Embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0019] Reference is now made to the accompanying drawings to describe exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0020] Unless otherwise specified, the terms used herein (including technical terms) have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood as having a meaning consistent with the context of their related fields, and should not be understood as idealized or overly formal meanings.

[0021] Embodiment 1 The present invention provides a multi-view discharging and guiding method for an extrusion production line, including the following steps: Step 1) When the extruded profile 4 is extruded from the outlet of the extruder, the camera 5 in the vision unit moves to the working position, takes a picture of the profile 4, and transmits the captured image to the industrial control computer. The image is compared and analyzed through the image processing system of the industrial control computer to determine the surface characteristics, external dimensions, and distance from the outlet of the profile 4, and to judge whether the center line of the profile 4 is consistent with the center line of the mold; Step 2) When it is judged that the center line of the profile 4 is not consistent with the center line of the mold, the industrial control computer calculates the guiding distance and sends it to the PLC control system; Step 3) The PLC control system converts the guiding distance into the angular displacement of the action variable-frequency motor 2 and sends a signal to drive the action variable-frequency motor 2 to move; Step 4) The movement of the action variable-frequency motor 2 drives the guiding structure to move. The guiding structure drives the guiding roller 8 to contact the profile 4 and pushes the extruded profile 4 to the position of the center line of the mold; Step 5) After the vision unit detects that the center line of the extruded profile 4 is consistent with the center line of the mold, it sends a signal to the PLC control system. The PLC control system controls the action variable-frequency motor 2 to reset to the initial state, and this guiding ends.

[0022] The camera 5 converts the captured target into an image signal, transmits it to the image processing system, obtains the morphological information of the captured target, and converts it into a digital signal according to information such as pixel distribution, brightness, and color.

[0023] The method of the present invention judges whether the extruded profile 4 deviates from the die center line through the vision unit, realizes the intelligent observation of the profile 4 after it exits the die, and adaptively matches the correction value according to the type of the profile 4 and the change of the discharge position value. At the same time, it dynamically adjusts the adaptation value of the correction in real time, and accurately corrects the extruded profile 4 under the control of the PLC control system, ensuring the accuracy and stability of the discharge correction of the profile 4 in the extrusion production line, and greatly improving the intelligent level of the discharge correction control of the extrusion production line.

[0024] Embodiment 2 Based on Embodiment 1, this embodiment provides a multi-view discharge correction method for an extrusion production line. As Figure 1 shown, it also includes inputting control instructions to the PLC control system through the HMI human-machine interface, and real-time displaying the operating state of the extruded profile 4 to realize remote control of the correction process.

[0025] The PLC control system is electrically connected to the HMI human-machine interface and is used to receive the instructions sent by the HMI human-machine interface.

[0026] Embodiment 3 Based on Embodiment 1, this embodiment provides a multi-view discharge correction method for an extrusion production line. In step 4) during the correction process, the PLC control system monitors the movement distance of the action variable-frequency motor 2 in real time. After reaching the position, the PLC control system sends a stop signal to the action variable-frequency motor 2.

[0027] The action variable-frequency motor 2 is equipped with an encoder II, and the encoder II is used to detect the rotational displacement of the action variable-frequency motor 2 in real time.

[0028] Embodiment 4 Based on Embodiment 2, this embodiment provides a multi-view discharge correction method for an extrusion production line. The vision unit includes a camera 5, a walking variable-frequency motor, an encoder I, and an industrial computer. The walking variable-frequency motor, the industrial computer, and the encoder I are all electrically connected to the PLC control system by electrical signals; There are two cameras 5, which are respectively installed above and on one side of the discharge port with a 90° difference. The industrial computer analyzes and compares the images taken by the two cameras 5 through the installed image processing system. The walking variable-frequency motor is used to drive the camera 5 to move, and the encoder I is used to detect the walking displacement of the camera 5 in real time.

[0029] The PLC control system includes a PLC controller, an analog output module, and an analog input module. The analog output module and the analog input module are both electrically connected to the PLC controller by electrical signals.

[0030] The PLC controller and the HMI human-machine interface perform data interaction through TCP / IP communication. The walking variable-frequency motor is signal-connected to the analog output module, and the encoder 1 is signal-connected to the analog input module.

[0031] The PLC control system controls the operation of the walking variable-frequency motor, causing the camera 5 installed above the discharge port to move to the corresponding working position, that is, below the discharge port and above the guiding unit. During the process, the encoder 1 monitors the movement distance of the walking variable-frequency motor in real time and feeds it back to the PLC control system. After reaching the position, the driving is stopped.

[0032] The walking variable-frequency motor includes the walking variable-frequency motor 1 13 and the walking variable-frequency motor 2 14. As Figure 1 shown, the camera 5 in the vertical direction moves vertically, the rotating shaft of the walking variable-frequency motor 1 13 drives the gear to rotate, the camera 5 in the horizontal direction moves horizontally, and the rotating shaft of the walking variable-frequency motor 2 14 drives the gear to rotate. Both are meshed with the rack rail 15 and respectively drive the camera 5 connected to the rack rail 15 to move.

[0033] Embodiment 5 Based on Embodiment 4, this embodiment provides a multi-view discharge guiding method for an extrusion production line. When the single guiding action cycle ends until the visual unit detects that the extrusion profile 4 has a position offset again, the next guiding action cycle is started; After the entire extrusion work process is completed, the PLC control system controls the operation of the walking variable-frequency motor, causing the camera 5 that has moved to the visual unit to return to the initial position. During the process, the movement distance of the walking variable-frequency motor is monitored in real time and fed back to the PLC control system. After reaching the position, the driving is stopped.

[0034] During the entire guiding process, the guiding adaptation value is adjusted in real-time dynamically in a closed-loop manner to ensure the accuracy and stability of the discharge guiding of the profile 4 on the extrusion production line, and greatly improve the intelligent level of the discharge guiding control of the extrusion production line.

[0035] Embodiment 6 Based on Embodiment 1, this embodiment provides a multi-view discharge guiding method for an extrusion production line. A driving gear 1 is connected to the rotating shaft of the action variable-frequency motor 2, and the driving gear 1 meshes with a guiding input gear 7; the guiding roller 8 is a four-guiding roller or a six-guiding roller.

[0036] The driving gear 1 drives the guiding input gear 7 to rotate, thereby driving the guiding structure to move, causing the guiding roller 8 to contact the extruded material and push it to the center line position of the extrusion port.

[0037] The four-guiding roller or the six-guiding roller can be selected according to requirements, such as the size of the profile 4.

[0038] The four guiding rollers 8 include an upper guiding roller, a lower guiding roller, a left guiding roller, and a right guiding roller. The left guiding roller and the right guiding roller are symmetrically installed on the horizontal center line of the extrusion discharge port, and the upper guiding roller and the lower guiding roller are symmetrically installed on the vertical center line of the extrusion discharge port.

[0039] Each guiding roller 8 is fixed on the moving plate 9 of the guiding mechanism. The moving plate 9 is embedded into the upper guiding groove 10 and the lower guiding groove 11 of the guiding mechanism by two upper and lower guiding protrusions (or guiding pin shafts 3). The upper guiding groove 10 is opened on the housing 12, and the four upper guiding grooves 10 are radially arranged in a 90° dispersion. The four lower guiding grooves 11 are opened on the rotatable disc 6 to form a square. The movement of a single moving plate 9 is restricted by the upper guiding groove 10 and the lower guiding groove 11 to be a translational motion plus a rotational motion. The movement formed by the four moving plates 9 jointly is to move synchronously towards the center, thereby driving the guiding rollers 8 to complete the guiding motion of the extruded material. A 1 / 4 circular arc groove is opened on the guiding mechanism housing 12. One end of the driving rod fixed on the rotatable disc 6 extends out of this groove, and the other end is connected to the guiding input gear 7 through a pin hole.

[0040] Embodiment 7 Based on Embodiment 6, this embodiment provides a multi-view discharge guiding method for an extrusion production line. The guiding structure includes a moving plate 9, a housing, and a rotatable disc 6. The housing is provided with an upper guiding groove 10, the rotatable disc 6 is provided with a lower guiding groove 11, and the guiding roller input gear 7 is arranged between the housing and the rotatable disc 6; Each guiding roller 8 is respectively fixed on the corresponding moving plate 9, and a single moving plate 9 is embedded into the upper guiding groove 10 and the lower guiding groove 11 through a guiding pin shaft 3.

[0041] The variable-frequency motor 2 operates to make the driving gear 1 rotate. The driving gear 1 meshes with the guiding input gear 7, driving the guiding input gear 7 to rotate and driving the rotatable disc 6 to move, so that the guiding rollers 8 on the moving plate 9 move along the guiding of the upper guiding groove 10 and the lower guiding groove 11, realizing the guiding of the profile 4.

[0042] Embodiment 8 Based on Embodiment 7, this embodiment provides a multi-view discharge guiding method for an extrusion production line. As Figure 3 shown, the six guiding rollers include an upper guiding roller, a lower guiding roller, an upper left guiding roller, an upper right guiding roller, a lower left guiding roller, and a lower right guiding roller. The upper left guiding roller and the upper right guiding roller are symmetrically installed above the horizontal center line of the extrusion discharge port, the lower left guiding roller and the lower right guiding roller are symmetrically installed below the horizontal center line of the extrusion discharge port, the upper guiding roller and the lower guiding roller are symmetrically installed on the vertical center line of the extrusion discharge port, and the installation of the six guiding rollers 8 forms a regular hexagon.

[0043] The upper guiding roller, lower guiding roller, upper left guiding roller, upper right guiding roller, lower left guiding roller and lower right guiding roller are distributed at 60°, and the extrusion outlet profile 4 is guided in the upper, lower, upper left, upper right, lower left and lower right directions, so that the center line of the profile 4 is aligned with the center line of the die.

[0044] Embodiment 9 On the basis of Embodiment 8, this embodiment provides a multi-view discharging and guiding method for an extrusion production line, as Figure 2 shown, the upper guiding groove 10 is radially arranged in a 60° dispersion, the lower guiding groove 11 forms a regular hexagon, and the movement of a single moving plate 9 is restricted to translational motion plus rotation by the upper guiding groove 10 and the lower guiding groove 11.

[0045] An arc groove of 1 / 6 circle is opened on the housing, one end of the driving rod of the rotatable disc 6 extends out from the 1 / 6 arc groove, and the other end is connected to the guiding input gear 7 through a pin hole.

[0046] The movement of a single moving plate 9 is restricted to translational motion plus rotation by the upper guiding groove 10 and the lower guiding groove 11, and the movement formed by the six moving plates 9 jointly is to move synchronously towards the center, thereby driving the guiding roller 8 to complete the guiding movement of the extruded material.

[0047] The above examples are only illustrative of the present invention and do not constitute a limitation on the protection scope of the present invention. Any design identical or similar to the present invention falls within the protection scope of the present invention.

Claims

1. A multi-view discharging and guiding method for an extrusion production line, characterized in that: It includes the following steps: Step 1) When the extruded profile is extruded from the outlet of the extrusion machine, the camera in the vision unit moves to the working position, takes a photo of the profile, and transmits the taken photo image to the industrial control computer. The image is compared and analyzed through the image processing system of the industrial control computer to determine the surface characteristics, external dimensions of the profile, and the distance from the outlet, and to judge whether the center line of the profile is consistent with the center line of the die; Step 2) When it is judged that the center line of the profile is not consistent with the center line of the die, the industrial control computer calculates the guiding distance and sends it to the PLC control system; Step 3) The PLC control system converts the guiding distance into the angular displacement of the action variable-frequency motor and sends a signal to drive the action variable-frequency motor to move; Step 4) The movement of the action variable-frequency motor drives the guiding structure to move. The guiding structure drives the guiding roller to contact the profile and pushes the extruded profile to the position of the die center line; Step 5) After the vision unit detects that the center line of the extruded profile is consistent with the center line of the die, it sends a signal to the PLC control system. The PLC control system controls the action variable-frequency motor to reset to the initial state, and this guiding ends; It also includes inputting control instructions to the PLC control system through the HMI human-machine interface, and real-time displaying the running state of the extruded profile to realize the remote control of the guiding process; Step 4) During the guiding process, the PLC control system monitors the action distance of the action variable-frequency motor in real time. After reaching the position, the PLC control system sends a stop signal to the action variable-frequency motor; The vision unit includes a camera, a walking variable-frequency motor, an encoder 1, and an industrial control computer. The walking variable-frequency motor, the industrial control computer, and the encoder 1 are all electrically connected to the PLC control system; There are two cameras, which are respectively installed above and on one side of the outlet at a difference of 90°. The industrial control computer compares and analyzes the images taken by the two cameras through the installed image processing system. The walking variable-frequency motor is used to drive the camera to move, and the encoder 1 is used to detect the walking displacement of the camera in real time; When a single guiding action cycle ends until the vision unit detects that the position of the extruded profile shifts again, the next guiding action cycle is started; After the entire extrusion work process ends, the PLC control system controls the action of the walking variable-frequency motor to make the camera moving to the vision unit return to the initial position. During the process, it monitors the action distance of the walking variable-frequency motor in real time and feeds it back to the PLC control system, and stops driving after reaching the position; A driving gear is connected to the rotating shaft of the action variable-frequency motor, and the driving gear meshes with a guiding input gear; The guiding roller is a four-guiding roller or a six-guiding roller; The guiding structure includes a moving plate, a housing, and a rotatable disc. An upper guiding groove is provided on the housing, and a lower guiding groove is provided on the rotatable disc. The input gear of the guiding roller is arranged between the housing and the rotatable disc; The four guiding rollers include an upper guiding roller, a lower guiding roller, a left guiding roller, and a right guiding roller. The left guiding roller and the right guiding roller are symmetrically installed on the horizontal center line of the extrusion outlet, and the upper guiding roller and the lower guiding roller are symmetrically installed on the vertical center line of the extrusion outlet; The four guide rollers are respectively fixed on the corresponding moving plates. The upper guide grooves are radially arranged in a 90° dispersion, and the lower guide grooves form a square. The movement of a single moving plate is restricted to translational motion plus rotation through the upper and lower guide grooves. The six guide rollers include an upper guide roller, a lower guide roller, a left upper guide roller, a right upper guide roller, a left lower guide roller, and a right lower guide roller. The left upper guide roller and the right upper guide roller are symmetrically installed above the horizontal center line of the extrusion discharge port. The left lower guide roller and the right lower guide roller are symmetrically installed below the horizontal center line of the extrusion discharge port. The upper guide roller and the lower guide roller are symmetrically installed on the vertical center line of the extrusion discharge port. The installation of the six guide rollers forms a regular hexagon. The six guide rollers are respectively fixed on the corresponding moving plates. The upper guide grooves are radially arranged in a 60° dispersion, and the lower guide grooves form a regular hexagon. The movement of a single moving plate is restricted to translational motion plus rotation through the upper and lower guide grooves. An arc groove of 1 / 4 or 1 / 6 is formed on the housing. The driving rod of the rotatable disk extends out from the arc groove of 1 / 4 or 1 / 6 and is connected to the guide input gear through a pin hole.

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