Servo control system of anchor chain ring bending machine

Abstract

The utility model discloses a servo control system of an anchor chain ring bending machine, a programmable logic controller PLC, a servo driver, a servo valve, an oil cylinder, a fork-shaped piece and an external hysteresis displacement sensor form closed loop connection in sequence, the programmable logic controller PLC is connected with a touch screen, a shell of the external hysteresis displacement sensor is fixed on a ring bending machine body, and the servo driver is connected with the servo valve. A sliding block magnetic ring of the external hysteresis displacement sensor is fixed to a moving fork-shaped piece of the ring bending machine, the pulse number of the moving distance of the fork-shaped piece is detected through the external hysteresis displacement sensor, and detected pulse signals are fed back to the PLC. A closed-loop servo control system is adopted, continuous and accurate feedback data of each action of the ring bending machine are measured in real time through an external hysteresis displacement sensor, the positioning precision is high, the shaping precision of the ring bending machine is improved, the product quality and the anchor chain production efficiency are improved, and the labor intensity is reduced.

Description

Technical Field

[0001] This utility model relates to the field of servo control technology for anchor chain bending machines, and in particular to a servo control system for anchor chain bending machines. Background Technology

[0002] Poor control precision in ring bending equipment is a major factor leading to substandard anchor chain ring dimensions and shapes. The old ring bending equipment used a switch-based electrical control system with a fork-shaped screw adjustment to control the bending machine's forming precision. Due to poor control precision, this frequently resulted in damage to the fork-shaped adjusting screw threads and inconsistent forming amounts of the anchor chain rings during production, leading to substandard anchor chain ring dimensions and shapes, ultimately resulting in scrap. Therefore, improving the electrical control precision of the ring bending machine and effectively reducing excessive human intervention are of great significance to the quality of anchor chain ring production. Summary of the Invention

[0003] The purpose of this invention is to improve upon the shortcomings of the current open-loop control method, which uses switch control signals, ordinary reversing valves, and adjusting fork-shaped component lead screws, resulting in inaccurate positioning of the fork-shaped component. It provides a servo control system for anchor chain bending machines, employing an electro-hydraulic servo closed-loop control system to reduce excessive human intervention and improve the positioning control accuracy of the fork-shaped component, thereby solving the problem of poor positioning control accuracy.

[0004] To achieve the above technical objectives and requirements, the technical solution adopted by this utility model is as follows: a servo control system for an anchor chain bending machine, comprising a programmable logic controller (PLC), a servo driver, a servo valve, a hydraulic cylinder, a fork-shaped component, and an external hysteresis displacement sensor connected in a closed loop in sequence. The PLC is connected to a touch screen. The housing of the external hysteresis displacement sensor is fixed to the machine body, and the slider magnetic ring of the external hysteresis displacement sensor is fixed to the moving fork-shaped component of the bending machine. The external hysteresis displacement sensor detects the number of pulses in the movement distance of the fork-shaped component and feeds back the detected pulse signal to the PLC. The PLC calculates the position of the fork-shaped component. The position of the fork-shaped component is set on the touch screen, and PID control calculation is performed based on the position fed back by the external hysteresis displacement sensor. The PLC automatically outputs a control voltage signal to the electro-hydraulic servo driver to drive the electro-hydraulic servo valve to control the movement of the hydraulic cylinder.

[0005] Preferably, the servo valve includes a left servo valve and a right servo valve. The left servo valve is connected to a left nitrogen cylinder, and the right servo valve is connected to a right nitrogen cylinder. The hydraulic cylinder includes a left shaping cylinder and a right shaping cylinder. The left shaping cylinder is connected to the left servo valve, and the right shaping cylinder is connected to the right servo valve. A left external hysteresis displacement sensor detects the position of the left shaping fork and feeds it back to the programmable logic controller (PLC). A right external hysteresis displacement sensor detects the position of the right shaping fork and feeds it back to the PLC.

[0006] Preferably, the servo control system simultaneously controls the position of the bending machine's pushing mechanism, forming mechanism, left forming fork, and right forming fork, so that the control error is controlled within 0.1mm.

[0007] Compared with the traditional structure, the beneficial effects of this utility model are:

[0008] 1. A closed-loop servo control system is adopted. Through an external hysteresis displacement sensor, the positions of the bending machine clamp 1, forming mechanism, left forming fork, and right forming fork are fed back in real time. This ensures that each action of the bending machine has continuous and accurate feedback data for real-time measurement, resulting in high positioning accuracy. This improves the forming accuracy of the bending machine, enhances product quality and anchor chain production efficiency, and reduces labor intensity.

[0009] 2. The movement of each cylinder is controlled by setting the position via the touch screen. This eliminates the need for extensive manual adjustment of the proximity switches and left and right shaping fork screws for each action. Only during the initial production of anchor chain specifications does it require manual adjustment of the position and measurement of the position data for each action. The measured data is then input into the data box for each action, making the operation convenient. Attached Figure Description

[0010] Figure 1 This is a circuit diagram of the present invention;

[0011] Figure 2 This is a simplified diagram of the system of this utility model;

[0012] Figure 3 This is a diagram showing the interface for fine-tuning the position data of this utility model.

[0013] Figure 4 This is a diagram showing the system data management interface of this utility model.

[0014] In the diagram: 1. External hysteresis displacement sensor, 11. Left external hysteresis displacement sensor, 12. Right external hysteresis displacement sensor, 2. Shaping cylinder, 21. Left shaping cylinder, 22. Right shaping cylinder, 3. Servo valve, 31. Left servo valve, 32. Right servo valve, 4. Servo valve driver, 5. PLC, 6. Touch screen, 71. Left nitrogen cylinder, 72. Right nitrogen cylinder, 8. Fork-shaped component, 81. Left shaping fork-shaped component, 82. Right shaping fork-shaped component. Detailed Implementation

[0015] The present invention will be further described below.

[0016] See attached document Figure 1-2 The anchor chain bending machine servo control system consists of a programmable logic controller (PLC) 5, a servo driver 4, a servo valve 3, a hydraulic cylinder 2, a fork-shaped component 8, and an external hysteresis displacement sensor 1, which are connected in a closed loop in sequence. The PLC 5 is connected to a touch screen 6. The housing of the external hysteresis displacement sensor 1 is fixed to the bending machine body, and the slider magnetic ring of the external hysteresis displacement sensor 1 is fixed to the moving fork-shaped component 8 of the bending machine. The external hysteresis displacement sensor 1 detects the number of pulses in the movement distance of the fork-shaped component 8 and feeds back the detected pulse signal to the PLC 5. The PLC 5 then calculates the position moved by the fork-shaped component 8. Finally, the position of the fork-shaped component 8 is set by the touch screen 6, and PID control (proportional-integral-derivative control) is performed based on the position fed back by the external hysteresis displacement sensor 1. The PLC automatically outputs a control voltage signal to the electro-hydraulic servo driver 4, which drives the electro-hydraulic servo valve 3 to control the movement of the hydraulic cylinder 2.

[0017] In this preferred embodiment, the servo valve 3 includes a left servo valve 31 and a right servo valve 32. The left servo valve 31 is connected to the left nitrogen cylinder 71, and the right servo valve 32 is connected to the right nitrogen cylinder 72. The hydraulic cylinder 2 includes a left shaping hydraulic cylinder 21 and a right shaping hydraulic cylinder 22. The left shaping hydraulic cylinder 21 is connected to the left servo valve 31, and the right shaping hydraulic cylinder 22 is connected to the right servo valve 32. The left external hysteresis displacement sensor 11 detects the position of the left shaping fork 81 and feeds it back to the programmable logic controller (PLC) 5. The right external hysteresis displacement sensor 12 detects the position of the right shaping fork 82 and feeds it back to the PLC 5.

[0018] In this preferred embodiment, the servo control system simultaneously controls the position of the bending machine's pushing mechanism, forming mechanism, left forming fork 81, and right forming fork 82, so that the control error is controlled within 0.1mm.

[0019] In practical implementation, the closed-loop servo control system mainly consists of an external hysteresis displacement sensor 1, a hydraulic cylinder 2, a servo valve 3, a servo driver 4, a PLC 5, a touch screen 6, a nitrogen cylinder, and other electrical and hydraulic auxiliary components. Through the external hysteresis displacement sensor, the servo control system simultaneously controls the position of the bending machine's pusher clamp 1, forming mechanism, left shaping, and right shaping, keeping the control error within 0.1mm. This ensures continuous and accurate real-time measurement of feedback data for each movement of the bending machine.

[0020] The servo control system of the ring bending machine uses a "recipe" function to save the anchor chain production specification parameters. When producing the same specifications in the future, these parameters can be directly called up without needing to measure and adjust the positions of the various movements of the ring bending machine again. Figure 4 As shown, this enables the management of production specification data for the bending machine.

[0021] To facilitate operators in inputting position data, after manually adjusting the position, click "OK" below the data frame. The button automatically fills the current position data into the input box. The position can also be fine-tuned using the plus and minus buttons. Figure 3 As shown.

[0022] The above embodiments of this utility model are merely examples to clearly illustrate this utility model, and are not intended to limit the scope of protection of this utility model. All equivalent technical solutions also fall within the scope of this utility model, and the patent protection scope of this utility model should be defined by each claim.

Claims

1. A servo control system for an anchor chain bending machine, characterized in that: The programmable logic controller (PLC) (5), servo driver (4), servo valve (3), oil cylinder (2), fork (8), and external hysteresis displacement sensor (1) are connected in a closed loop in sequence. The programmable logic controller (PLC) (5) is connected to the touch screen (6). The outer shell of the external hysteresis displacement sensor (1) is fixed on the body of the bending machine. The slider magnetic ring of the external hysteresis displacement sensor (1) is fixed on the moving fork of the bending machine. The external hysteresis displacement sensor (1) detects the number of pulses of the moving distance of the fork and feeds back the detected pulse signal to the programmable logic controller (PLC) (5). The programmable logic controller (PLC) (5) calculates the moving position of the fork (8). The touch screen (6) sets the position of the fork and the position fed back by the external hysteresis displacement sensor (1) for PID control calculation. The programmable logic controller (PLC) (5) automatically outputs the control voltage signal to the electro-hydraulic servo driver (4) to drive the electro-hydraulic servo valve (3) to control the movement of the oil cylinder (2).

2. The servo control system for the anchor chain bending machine according to claim 1, characterized in that: The servo valve (3) includes a left servo valve (31) and a right servo valve (32). The left servo valve (31) is connected to the left nitrogen cylinder (71), and the right servo valve (32) is connected to the right nitrogen cylinder (72). The cylinder (2) includes a left shaping cylinder (21) and a right shaping cylinder (22). The left shaping cylinder (21) is connected to the left servo valve (31), and the right shaping cylinder (22) is connected to the right servo valve (32). The left external hysteresis displacement sensor (11) detects the position of the left shaping fork (81) and feeds it back to the programmable logic controller (PLC) (5). The right external hysteresis displacement sensor (12) detects the position of the right shaping fork (82) and feeds it back to the programmable logic controller (PLC) (5).

3. The servo control system for the anchor chain bending machine according to claim 1, characterized in that: The servo control system simultaneously controls the position of the bending machine's feeding mechanism, forming mechanism, left forming fork (81), and right forming fork (82), so that the control error is controlled within 0.1mm.

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