Servo groove jumping control system and method for edge bonding machine

Abstract

The invention relates to the technical field of edge bonding machines, in particular to an edge bonding machine servo groove jumping control system and method, and the system comprises a conveying mechanism control unit, a servo groove jumping control unit, a man-machine conversation unit and a CPU control unit, the servo groove jumping control unit comprises a plate feeding sensing optical fiber, an X-axis servo motor, a Z-axis servo motor, an X-axis servo driver, a Z-axis servo driver, a cutter frequency converter and a cutter motor; the conveying mechanism control unit comprises a conveying mechanism frequency converter, a frequency converter PG card, a dragging motor and a rotary encoder. A dragging motor + frequency converter + PG card mode is adopted, accurate position control of the motor can be achieved, and the problems of errors and stability in operation are reduced; the rotation angle of the motor is converted into a digital signal, the rotary encoder feeds back a dragging operation speed signal to the frequency converter through the PG card, the frequency output of the frequency converter is automatically adjusted, and the problems of errors and stability in operation are reduced.

Description

Technical Field

[0001] This invention relates to the field of edge banding machine technology, and in particular to a servo-controlled slotting control system and method for an edge banding machine. Background Technology

[0002] In the field of panel furniture manufacturing, edge banding machines are key equipment used to band the edges of panels. To meet subsequent assembly requirements (such as installing connectors, hinges, etc.), it is often necessary to create grooves (i.e., "grooving" or "skipping") at specific locations on the edge of the panel. Traditional edge banding machines often use servo skipping mechanisms to achieve the skipping function. Servo skipping mechanisms are specialized machines for panel furniture factories. Their skipping operation is as follows: the grooving cutter only grooves the middle part of the panel, leaving the beginning and end of the panel ungrooved; the servo skipping control mechanism is versatile, and the grooving cutter can also groove the entire panel. The traditional method involves using a cylinder to control the tool's feed and retraction. The tool's position is then manually adjusted using a wrench to control the lead screw position, thus achieving the desired grooving depth and position. This method is slow and inefficient. Furthermore, since it relies on a cylinder, it is affected by air pressure conditions. When grooving, the head and tail of the material must maintain their positions, making it impossible to achieve the required precision. In addition, the lack of real-time speed and position feedback means that when the load changes, the conveyor speed becomes unstable, causing the grooving start and end positions to shift, affecting processing accuracy. Summary of the Invention

[0003] This invention addresses the problems of existing technologies by providing a servo slotting control system and method for an edge banding machine. It employs a drive motor + frequency converter + PG card mode, enabling precise motor position control and reducing operational errors and stability issues. This invention converts the motor's rotation angle into a digital signal, and the rotary encoder feeds back the driven speed signal to the frequency converter via the PG card, thereby automatically adjusting the frequency converter's output frequency and reducing operational errors and stability problems, thus solving the problem of uniform speed in the conveying mechanism.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a servo skipping control system for an edge banding machine, comprising a conveyor mechanism control unit, a servo skipping control unit, a human-machine interface unit, and a CPU control unit, wherein the human-machine interface unit is connected to the CPU control unit; the servo skipping control unit includes an infeed sensing fiber, an X-axis servo motor, a Z-axis servo motor, an X-axis servo driver, a Z-axis servo driver, a tool inverter, and a tool motor, wherein the infeed sensing fiber, the X-axis servo driver, the Z-axis servo driver, and the tool inverter are respectively connected to the CPU control unit, the X-axis servo driver is used to drive the X-axis servo motor, and the Z-axis servo driver... The axis servo driver is used to drive the Z-axis servo motor, and the tool frequency converter is used to drive the tool motor. The conveying mechanism control unit includes a conveying mechanism frequency converter, a frequency converter PG card, a drive motor, and a rotary encoder. The frequency converter PG card is installed on the conveying mechanism frequency converter, and the rotary encoder is installed on the drive motor. The conveying mechanism frequency converter is connected to the CPU control unit. The rotary encoder feeds back the running speed signal of the drive motor to the conveying mechanism frequency converter through the frequency converter PG card, and then the control unit of the conveying mechanism frequency converter automatically adjusts the frequency output of the conveying mechanism.

[0005] The CPU control unit includes a programmable controller. The feed-in sensing fiber and the tool frequency converter are respectively connected to the I / O module of the programmable controller. The X-axis servo driver and the Z-axis servo driver communicate with the communication module of the programmable controller via EtherCAT. The conveyor frequency converter communicates with the programmable controller via RS485.

[0006] The human-computer dialogue unit is equipped with a job-hopping setting module, which is used to set the job-hopping mode.

[0007] The grooving mode includes setting the groove edge distance, groove depth, no-grooving size at the head of the board, no-grooving size at the tail of the board, and speed.

[0008] The human-computer dialogue unit and the CPU control unit communicate via Ethernet.

[0009] Preferably, the programmable controller is model AS324MT.

[0010] The CPU control unit controls the Z-axis servo driver based on the real-time movement position 'a' of the board. When a ≥ c + d + e, the CPU control unit drives the Z-axis servo driver to move the Z-axis servo motor to drive the tool motor upward, where c is the head dimension of the board, d is the head position of the board, and e is the head error value of the board. When a ≥ f + g + h, the CPU control unit drives the Z-axis servo driver to move the Z-axis servo motor to drive the tool motor downward, where f is the tail dimension of the board, g is the tail position of the board, and h is the tail error value of the board.

[0011] The present invention also provides a servo slotting control method based on the aforementioned servo slotting control system for edge banding machines, which includes the following steps: Step S1: Power on and initialize the system; Step S2: Set the switching parameters, including setting the speed and selecting the working component; Step S3, Program Startup: The servo driver performs positioning, the tool motor starts, and the board enters the edge banding machine; Step S4: The board passes through the infeed sensing fiber, and the rotary encoder calculates the motion position data; Step S5: When the board reaches the saw blade rising position, the Z-axis servo driver is triggered to perform positioning, driving the tool motor to rise and drive the saw blade to rise to process the moving board. Step S6: The board continues to move forward. When the board reaches the saw blade descent position, the Z-axis servo driver is triggered to perform positioning, which drives the tool motor to descend and drive the saw blade to descend, thereby detaching it from the board. Step S7: The tool motor and blade return to the waiting position, and the action is completed.

[0012] In step S5, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥c+d+e, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to rise. Here, c is the reserved size of the board head, d is the moving position of the board head, and e is the error value of the board head.

[0013] In step S6, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥f+g+h, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to descend. Here, f is the tail size of the board, g is the tail position of the board, and h is the tail error value of the board.

[0014] The beneficial effects of this invention are: This invention employs a drive motor + frequency converter + PG card mode, enabling precise position control of the motor and reducing operational errors and stability issues. This invention converts the motor's rotation angle into a digital signal, and the rotary encoder feeds back the driven speed signal to the frequency converter via the PG card, thereby automatically adjusting the frequency converter's output frequency and reducing operational errors and stability problems, thus solving the problem of uniform speed in the conveyor mechanism.

[0015] The servo grooving mechanism of this invention achieves both horizontal and vertical movement of the saw blade through a precision servo, resulting in high positioning accuracy and easy adjustment of the saw blade position. The grooving action is achieved by using a board induction fiber optic cable, a drag encoder, and a frequency converter PG card, which can improve the dimensional accuracy of the grooving and ensure the process requirements of furniture installation. Attached Figure Description

[0016] Figure 1 This is a control framework diagram of the servo slotting control system for the edge banding machine according to Embodiment 1 of this application.

[0017] Figure 2 This is a wiring diagram of the components of the servo slotting control system for the edge banding machine according to Embodiment 1 of this application.

[0018] Figure 3 This is a schematic diagram of the servo-driven skipping mechanism of the edge banding machine.

[0019] Figure 4 This is a flowchart of the servo slot switching control method according to Embodiment 2 of this application. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0021] Example 1 Embodiment 1 of this application, as Figures 1 to 2As shown, a servo skipping control system for an edge banding machine includes a conveyor mechanism control unit, a servo skipping control unit, a human-machine interface unit, and a CPU control unit. The human-machine interface unit is connected to the CPU control unit. The servo skipping control unit includes an infeed sensing fiber optic cable, an X-axis servo motor, a Z-axis servo motor, an X-axis servo driver, a Z-axis servo driver, a tool frequency converter, and a tool motor. The infeed sensing fiber optic cable, the X-axis servo driver, the Z-axis servo driver, and the tool frequency converter are respectively connected to the CPU control unit. The X-axis servo driver drives the X-axis servo motor, the Z-axis servo driver drives the Z-axis servo motor, and the tool frequency converter drives the tool motor. The tool motor operates; the conveying mechanism control unit includes a conveying mechanism frequency converter, a frequency converter PG card, a drive motor, and a rotary encoder. The frequency converter PG card is installed on the conveying mechanism frequency converter, and the rotary encoder is installed on the drive motor. The conveying mechanism frequency converter is connected to the CPU control unit. The rotary encoder feeds back the running speed signal of the drive motor to the conveying mechanism frequency converter through the frequency converter PG card. Then, the control unit of the conveying mechanism frequency converter automatically adjusts the frequency output of the conveying mechanism. The control unit of the conveying mechanism frequency converter can achieve dynamic adjustment through preset parameters and PID calculation using existing technology. That is, the frequency converter achieves automatic adjustment through the PID algorithm. Specifically, the servo skipping control system of the edge banding machine in this application embodiment is used to control the servo skipping mechanism (such as...) Figure 3 (As shown) to control.

[0022] In this embodiment, the CPU control unit includes a programmable controller, preferably an AS324MT. The feed sensor fiber and the tool inverter are respectively connected to the I / O module of the programmable controller; the X-axis servo driver and the Z-axis servo driver communicate with the communication module of the programmable controller via EtherCAT; the conveyor inverter communicates with the programmable controller via RS485. The human-machine interface unit communicates with the CPU control unit via Ethernet.

[0023] In this embodiment, the human-machine dialogue unit is equipped with a slotting setting module, which is used to set the slotting mode. The slotting mode includes setting the slot edge distance, slot depth, no-slotting-at-the-head and no-slotting-at-the-tail dimensions of the board, and speed.

[0024] The CPU control unit controls the Z-axis servo driver based on the real-time movement position 'a' of the board. When a ≥ c + d + e, the CPU control unit drives the Z-axis servo driver to move the Z-axis servo motor to drive the tool motor upward, where c is the head dimension of the board, d is the head position of the board, and e is the head error value of the board. When a ≥ f + g + h, the CPU control unit drives the Z-axis servo driver to move the Z-axis servo motor to drive the tool motor downward, where f is the tail dimension of the board, g is the tail position of the board, and h is the tail error value of the board.

[0025] Specifically, in the operation of this embodiment, the operator sets the slotting parameters (such as slot edge distance, slot depth, length of the head and tail without slotting, running speed, etc.) through the human-machine interface and transmits the parameters to the CPU control unit via Ethernet. The CPU control unit (based on AS324MT programmable controller) receives the parameters from the human-machine interface; communicates with the frequency converter of the conveying mechanism via RS485 to control the conveying speed of the plate; controls the X-axis servo driver and Z-axis servo driver in real time via EtherCAT to realize the lateral positioning and vertical lifting of the tool; receives the plate feeding sensing fiber optic signal through the I / O module and controls the tool frequency converter to start and stop the tool motor.

[0026] Under the above system architecture, the conveying mechanism has a feedback closed loop. The drive motor moves the plate forward, and its rotation speed is detected by the rotary encoder. The rotary encoder signal is fed back to the CPU through the frequency converter PG card, forming a speed closed loop to ensure that the calculation of the plate's movement position 'a' is accurate and reliable.

[0027] The grooving logic in this embodiment is as follows: When the board enters the edge banding machine, the system calculates the current position 'a' of the board in real time based on the cumulative displacement fed back by the rotary encoder. The upward trigger condition is: when a ≥ c + d + e (c = head retention dimension, d = head position reference, e = error compensation), the Z-axis servo driver controls the cutter to rise and cut into the board, initiating grooving. The downward trigger condition is: when a ≥ f + g + h (f = tail retention dimension, g = tail position reference, h = error compensation), the Z-axis servo driver controls the cutter to descend and detach from the board, ending grooving. The entire process is completed during the continuous movement of the board, without requiring machine downtime, achieving "dynamic grooving".

[0028] In this embodiment of the application, the servo slotting action position signal is provided by a rotary encoder on the drive motor shaft, which converts the movement of the board in the machine into an intuitive position value change, replacing the traditional limit switch control, improving the stability of the equipment, and allowing for quick and convenient adjustment of the corresponding action position parameters by changing the corresponding parameters through the host computer.

[0029] Because the number of boards inside the edge banding machine changes constantly during operation, and the cutting time of the boards is uncertain, the load on the conveyor mechanism frequently fluctuates, leading to unstable conveyor speed. Since grooving is performed on moving boards, this speed instability affects the accuracy of grooving. To address this issue, this embodiment employs a drive motor + frequency converter + PG card mode, enabling precise motor position control and reducing operational errors and stability issues. This embodiment converts the motor's rotation angle into a digital signal, and the rotary encoder feeds back the driven speed signal to the frequency converter via the PG card, automatically adjusting the frequency converter's output frequency to reduce operational errors and stability problems, thus solving the problem of uniform conveyor speed.

[0030] Specifically, in this embodiment, the horizontal and vertical movement of the saw blade in the servo grooving mechanism is achieved by a precision servo, which has high positioning accuracy and facilitates adjustment of the saw blade position. The grooving action is achieved by using a board induction fiber optic cable, a drag encoder, and a frequency converter PG card, which can improve the dimensional accuracy of the grooving and ensure the process requirements of furniture installation.

[0031] The AS324MT programmable controller communicates with the servo driver via EtherCAT. EtherCAT communication is characterized by fast response and stable communication. The system is controlled by a human-machine interface unit and a CPU control unit. The CPU control unit has an Ethernet port, which can interface with other devices for data sharing, facilitating production information management.

[0032] Embodiment 2 of this application, as follows Figure 4 As shown, a servo slotting control method based on the aforementioned servo slotting control system for edge banding machines is provided, which includes the following steps: Step S1: Power on and initialize the system; Step S2: Set the switching parameters, including setting the speed and selecting the working component; Step S3, Program Startup: The servo driver performs positioning, the tool motor starts, and the board enters the edge banding machine; Step S4: The board passes through the infeed sensing fiber, and the rotary encoder calculates the motion position data; Step S5: When the board reaches the saw blade rising position, the Z-axis servo driver is triggered to perform positioning, driving the tool motor to rise and drive the saw blade to rise to process the moving board. Step S6: The board continues to move forward. When the board reaches the saw blade descent position, the Z-axis servo driver is triggered to perform positioning, which drives the tool motor to descend and drive the saw blade to descend, thereby detaching it from the board. Step S7: The tool motor and blade return to the waiting position, and the action is completed.

[0033] In step S5, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥c+d+e, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to rise. Here, c is the reserved size of the board head, d is the moving position of the board head, and e is the error value of the board head.

[0034] In step S6, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥f+g+h, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to descend. Here, f is the tail size of the board, g is the tail position of the board, and h is the tail error value of the board.

[0035] Specifically, because the light spot emitted by the fiber optic induction sensor is very small, the system can obtain accurate real-time position data through a rotary encoder when the board touches or detaches from the induction sensor. This improves the accuracy of grooving. When the board moves to the position where the saw blade needs to rise, the Z-axis servo driver of the servo grooving mechanism performs positioning, the Z-axis servo motor of the servo grooving mechanism rises to the required position, the grooving saw blade processes the board, the board continues to move, and when the board moves to the position where the saw blade descends, the Z-axis servo driver of the servo grooving mechanism performs positioning, the Z-axis servo motor of the servo grooving mechanism descends to the required waiting position, the grooving saw blade detaches from the board, grooving ends, and the work continues on the next board.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present invention without departing from the scope of the present invention are within the scope of the present invention.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present invention without departing from the scope of the present invention are within the scope of the present invention.

Claims

1. A servo-controlled slot skipping system for an edge banding machine, characterized in that: The system includes a conveyor control unit, a servo slotting control unit, a human-machine interface unit, and a CPU control unit, with the human-machine interface unit connected to the CPU control unit. The servo slotting control unit includes an infeed sensing fiber optic cable, an X-axis servo motor, a Z-axis servo motor, an X-axis servo driver, a Z-axis servo driver, a tool inverter, and a tool motor. The infeed sensing fiber optic cable, X-axis servo driver, Z-axis servo driver, and tool inverter are all connected to the CPU control unit. The X-axis servo driver drives the X-axis servo motor, the Z-axis servo driver drives the Z-axis servo motor, and the tool inverter drives the tool motor. The conveyor control unit includes a conveyor inverter, an inverter PG card, a drive motor, and a rotary encoder. The inverter PG card is mounted on the conveyor inverter, and the rotary encoder is mounted on the drive motor. The conveyor inverter is connected to the CPU control unit. The rotary encoder feeds back the drive motor's running speed signal to the conveyor inverter via the inverter PG card, and the control unit of the conveyor inverter automatically adjusts the frequency output of the conveyor mechanism.

2. The servo skipping control system for an edge banding machine according to claim 1, characterized in that: The CPU control unit includes a programmable controller. The feed-in sensing fiber and the tool frequency converter are respectively connected to the I / O module of the programmable controller. The X-axis servo driver and the Z-axis servo driver communicate with the communication module of the programmable controller via EtherCAT. The conveyor frequency converter communicates with the programmable controller via RS485.

3. The servo skipping control system for an edge banding machine according to claim 2, characterized in that: The human-computer dialogue unit is equipped with a job-hopping setting module, which is used to set the job-hopping mode.

4. The servo skipping control system for an edge banding machine according to claim 3, characterized in that: The grooving mode includes setting the groove edge distance, groove depth, no-grooving size at the head of the board, no-grooving size at the tail of the board, and speed.

5. The servo skipping control system for an edge banding machine according to claim 2, characterized in that: The human-computer dialogue unit communicates with the CPU control unit via Ethernet.

6. The servo skipping control system for an edge banding machine according to claim 2, characterized in that: The programmable controller is model AS324MT.

7. The servo skipping control system for an edge banding machine according to claim 1, characterized in that: The CPU control unit controls the Z-axis servo driver to operate based on the real-time movement position 'a' of the board. When a ≥ c + d + e, the CPU control unit controls the Z-axis servo driver to drive the Z-axis servo motor to move the tool motor upward, where c is the head dimension of the board, d is the head position of the board, and e is the head error value of the board. When a ≥ f + g + h, the CPU control unit controls the Z-axis servo driver to drive the Z-axis servo motor to move the tool motor downward, where f is the tail dimension of the board, g is the tail position of the board, and h is the tail error value of the board.

8. A servo slotting control method based on the servo slotting control system of an edge banding machine according to any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Power on and initialize the system; Step S2: Set the switching parameters, including setting the speed and selecting the working component; Step S3, Program Startup: The servo driver performs positioning, the tool motor starts, and the board enters the edge banding machine; Step S4: The board passes through the infeed sensing fiber, and the rotary encoder calculates the motion position data; Step S5: When the board reaches the saw blade rising position, the Z-axis servo driver is triggered to perform positioning, driving the tool motor to rise and drive the saw blade to rise to process the moving board. Step S6: The board continues to move forward. When the board reaches the saw blade descent position, the Z-axis servo driver is triggered to perform positioning, which drives the tool motor to descend and drive the saw blade to descend, thereby detaching it from the board. Step S7: The tool motor and blade return to the waiting position, and the action is completed.

9. The servo slot skipping control method according to claim 8, characterized in that: In step S5, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥c+d+e, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to rise. Here, c is the reserved size of the board head, d is the moving position of the board head, and e is the error value of the board head.

10. The servo slot skipping control method according to claim 8, characterized in that: In step S6, the Z-axis servo driver is controlled to work according to the real-time moving position a of the board. When a≥f+g+h, the Z-axis servo driver is controlled to drive the Z-axis servo motor to drive the tool motor to descend. Here, f is the tail size of the board, g is the tail position of the board, and h is the tail error value of the board.

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