A wire stacking machine protective door buffer device

Abstract

The utility model relates to the technical field of chemical fiber production equipment, specifically relates to a kind of silk folding machine protective door buffer device, comprising: frequency conversion control module, door body state detection module and drive motor;The door body state detection module is used to detect the opening or closing position signal of protective door;The frequency conversion control module is electrically connected with the door body state detection module and the drive motor, for receiving the position signal, and according to the control logic output frequency conversion drive signal to the drive motor, to control the start-stop and rotational speed of the drive motor, realize the deceleration buffer when protective door is close to limit position, the utility model replaces traditional mechanical buffer with electrical control mode, completely solve the problem that protective door drops fast, impact ground, with the advantages of smooth operation, safe and reliable, strong adaptability and easy to transform.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical fiber production equipment, specifically to a buffer device for a protective door of a fiber stacking machine. Background Technology

[0002] The fiber stacking machine is one of the key pieces of equipment in the chemical fiber production process. It is usually equipped with a safety door to ensure operational safety and isolate the production environment. Current fiber stacking machine safety doors are mostly directly driven by a motor, with their opening and closing limits controlled by simple limit switches.

[0003] However, this traditional method has significant drawbacks: First, the protective door itself is quite heavy, and the drive system lacks an effective braking or buffering mechanism. This causes the protective door to impact the ground or frame at high speed at the end of its closing phase, especially if the limit switch malfunctions or responds slowly, generating tremendous impact and noise. This not only easily leads to door deformation and hinge damage, shortening the equipment's lifespan, but also poses serious safety hazards, potentially injuring operators or causing equipment failure. Second, the hard impact of directly starting and stopping the motor also adversely affects the motor itself and the transmission mechanism.

[0004] Although some improvement solutions attempt to add mechanical buffers (such as hydraulic dampers), these mechanical structures are prone to wear, jamming or oil leakage in the harsh working conditions of chemical fiber plants with high humidity and high fiber dust, resulting in low reliability. In addition, they require additional installation space and regular maintenance, which increases the cost of use.

[0005] Therefore, there is an urgent need in this field for a buffer device that can fundamentally solve the problem of impact on protective doors, operate smoothly and reliably, and adapt to the chemical fiber production environment. Utility Model Content

[0006] Purpose of the utility model: To provide a buffer device for the protective door of a wire stacking machine to solve the problems mentioned above.

[0007] Technical solution: A buffer device for a protective door of a wire stacking machine, comprising a frequency conversion control module, a door status detection module, and a drive motor;

[0008] The door status detection module is used to detect the open or closed position signal of the protective door;

[0009] The frequency conversion control module is electrically connected to the door status detection module and the drive motor. It is used to receive the position signal and output a frequency conversion drive signal to the drive motor according to the preset control logic to control the start, stop and speed of the drive motor, so as to realize the deceleration buffer when the protective door is close to the limit position.

[0010] In a further embodiment, the door status detection module includes an upper limit switch and a lower limit switch, which are respectively set at the corresponding positions when the protective door is fully open and fully closed.

[0011] In a further embodiment, the preset control logic of the frequency conversion control module is as follows: when the door status detection module detects that the protective door is running to a preset deceleration point close to the upper or lower limit, the frequency conversion control module controls the drive motor to switch from high-speed operation to low-speed operation.

[0012] In a further embodiment, the frequency conversion control module is also connected to a manual operation unit for receiving manually input instructions to open, close, or stop the door.

[0013] In a further embodiment, the frequency conversion control module is also connected to a fault alarm unit. When the drive motor operates abnormally or the door status detection module signal fails, the fault alarm unit issues a warning.

[0014] In a further embodiment, the frequency conversion control module includes: a DSP control circuit, a rectifier circuit, and an inverter circuit;

[0015] The input terminal of the rectifier circuit is connected to the power supply, and the output terminal is connected to the input terminal of the inverter circuit. The output terminal of the inverter circuit is connected to the motor. The DSP control circuit is connected to both the rectifier circuit and the inverter circuit.

[0016] In a further embodiment, the rectifier circuit includes: a first diode VD1, a second diode VD2, a third diode VD3, a fourth diode VD4, a fifth diode VD5, a sixth diode VD6, a current-limiting resistor RL, a thirteenth diode VD13, a seventh fully controlled device VT7, a first capacitor CD1, and a second capacitor CD2.

[0017] The anode of the first diode VD1 is connected to the cathode of the second diode VD2 and connected to AC power supply R. The anode of the third diode VD3 is connected to the cathode of the fourth diode VD4 and connected to AC power supply S. The anode of the fifth diode VD5 is connected to the cathode of the sixth diode VD6 and connected to AC power supply T. One end of the current-limiting resistor RL is simultaneously connected to the cathodes of the first diode VD1, the third diode VD3, and the secondary cathode of the fifth diode VD5, and the other end is simultaneously connected to the collector of the seventh fully controlled device VT7, the cathode of the thirteenth diode VD13, and the anode of the first capacitor CD1, and connected to the inverter circuit. The anode of the second capacitor CD2 is simultaneously connected to the emitter of the seventh fully controlled device VT7 and the anode of the thirteenth diode VD13, and the cathode is simultaneously connected to the anodes of the second diode VD2, the fourth diode VD4, the sixth diode VD6, and the cathode of the first capacitor CD1, and connected to the inverter circuit.

[0018] In a further embodiment, the inverter circuit includes: a first fully controlled device VT1, a second fully controlled device VT2, a third fully controlled device VT3, a fourth fully controlled device VT4, a fifth fully controlled device VT5, a sixth fully controlled device VT6, a seventh diode VD7, an eighth diode VD8, a ninth diode VD9, a tenth diode VD10, an eleventh diode VD11, and a twelfth diode VD12;

[0019] The emitter of the first fully controllable device VT1 and the anode of the seventh diode VD7 are connected to the collector of the fourth fully controllable device VT4 and the cathode of the eighth diode VD8, and are also connected to the U terminal of the motor. The emitter of the third fully controllable device VT3 and the anode of the ninth diode VD9 are connected to the collector of the sixth fully controllable device VT6 and the cathode of the tenth diode VD10, and are also connected to the V terminal of the motor. The emitter of the fifth fully controllable device VT5 and the anode of the eleventh diode VD11 are connected to the collector of the second fully controllable device VT2 and the cathode of the twelfth diode VD12. The negative terminal is connected to the W terminal of the motor. The collector of the first fully controllable device VT1 and the negative terminal of the seventh diode VD7, the collector of the third fully controllable device VT3 and the negative terminal of the ninth diode VD9 are connected to the collector of the fifth fully controllable device VT5 and the negative terminal of the eleventh diode VD11. The emitter of the fourth fully controllable device VT4 and the positive terminal of the eighth diode VD8, the emitter of the sixth fully controllable device VT6 and the positive terminal of the tenth diode VD10 are connected to the emitter of the second fully controllable device VT2 and the positive terminal of the twelfth diode VD12.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. Eliminate impact at the root: By using a frequency converter to smoothly control the speed of the drive motor, the protective door decelerates smoothly at the end of its travel until it closes gently, completely solving the problem of high-speed impact with the ground and significantly reducing noise and equipment wear.

[0022] 2. High reliability and maintenance-free: The core is electrical control with no mechanical wear parts, making it particularly suitable for the harsh environment of high temperature, high humidity and dust in chemical fiber plants. It has a long service life and basically requires no maintenance.

[0023] 3. Significantly enhanced safety: The smooth start-stop process avoids pinching accidents that may be caused by sudden stops or impacts of the door. At the same time, the fault alarm function can promptly remind operators to eliminate potential hazards, providing double protection for personal safety.

[0024] 4. Precise control and high level of intelligence: Through preset control logic, it can achieve precise deceleration point control and multi-speed operation, making the operation process smoother and more intelligent.

[0025] 5. Simple structure and easy to modify: This utility model can directly add a frequency conversion control module and a detection module to the original motor control circuit without making large-scale modifications to the mechanical structure of the protective door. It has low implementation cost and is easy to promote on existing equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the present invention.

[0027] Figure 2 This is the circuit diagram of the frequency conversion control module of this utility model. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] A buffer device for a protective door of a wire stacking machine includes a frequency converter control module, a door status detection module, and a drive motor. The door status detection module detects the open or closed position signal of the protective door. The frequency converter control module is electrically connected to the door status detection module and the drive motor, and receives the position signal. It outputs a frequency converter drive signal to the drive motor according to preset control logic to control the start, stop, and speed of the drive motor, thereby achieving deceleration and buffering of the protective door when it approaches its limit position.

[0032] In one embodiment, such as Figure 1 As shown, the drive motor, which provides power to the protective door, was originally driven directly by the mains frequency power supply. In this solution, its power input is changed to be provided by the frequency converter control module.

[0033] Door status detection module: In this embodiment, two limit switches (i.e., upper limit switch and lower limit switch) can be used. They are installed on the protective door guide rail or frame at locations slightly in front of the fully open and fully closed positions, respectively. When the protective door touches the switch, the switch sends a signal to the frequency converter control module 101.

[0034] Variable frequency control module: This is the core control unit and includes variable frequency drive (VFD) functionality. It receives signals from the door status detection module and executes preset control logic.

[0035] In one embodiment, such as Figure 2 As shown, the frequency conversion control module includes: a DSP control circuit, a rectifier circuit, and an inverter circuit;

[0036] The input terminal of the rectifier circuit is connected to the power supply, and the output terminal is connected to the input terminal of the inverter circuit. The output terminal of the inverter circuit is connected to the motor. The DSP control circuit is connected to both the rectifier circuit and the inverter circuit.

[0037] Specifically, the R, S, and T terminals receive AC power from the power grid, with each phase differing by 120°. The input AC voltage range is adjustable; this paper selects a voltage of 380V and a rated frequency of 50Hz. An uncontrolled rectifier bridge is formed by connecting six diodes VD1 to VD6 vertically, converting the power supply into pulsating DC power. Resistor RL is a current-limiting resistor. It is known that when the system is powered on, the surge current flowing through the bus capacitor is too large and can damage the capacitor. Adding a current-limiting resistor reduces the current and protects the bus capacitor. The resistance value of the current-limiting resistor is determined by the voltage across its terminals and the operating current; typically, a resistance of 100Ω and a power rating of around 10W are chosen. A relay is also added across the current-limiting resistor. Upon receiving a weak signal, the relay activates, allowing a large current to flow. The relay's function is to activate when the capacitor voltage reaches a certain value, bypassing the current-limiting resistor RL and preventing further energy consumption in the system. The intermediate DC link mainly consists of capacitors CD1, CD2, and VT13. In the new topology, the traditional large capacitor is replaced by a small capacitor CD1 and a switched capacitor CD2 connected in parallel. The function of capacitor CD1 is to absorb voltage spikes. If the absorption is incomplete, the switched capacitor CD2 is connected to the DC bus to continue absorbing excess energy. If capacitor CD1 is removed, when freewheeling energy is generated, the IGBT will take time to turn on from receiving the signal, causing the switched capacitor CD2 to fail to absorb the spike pulse in time, which will raise the bus voltage and damage the device. To ensure that the rectified output is a voltage waveform with six peaks, the value of capacitor CD1 should be as small as possible. Capacitor CD2 is connected in series with the fully controlled device VT13. The control chip issues commands, and when the collected voltage and current signals are compared with the comparison values ​​set inside the chip, a PWM square wave is generated to control the fully controlled device VT13, so that the switched small capacitor CD2 is connected to the DC bus. The capacitance value of the bus capacitor is selected between tens and hundreds of microfarads depending on the power of the load motor.

[0038] The three-phase inverter bridge consists of fully controlled devices VT1 to VT6, each controlled by a control chip. The upper and lower IGBTs on the same bridge arm operate in opposite modes. Six PWM waves are generated through modulation technology, acting on the three-phase inverter bridge to convert the bus voltage into AC power, which is then output to the motor load through the U, V, and W terminals. Control methods can include SPWM (Single-Pulse Width Modulation) or SVPWM (Spatial Vector Pulse Width Modulation). Both methods are based on constant voltage-frequency ratio control; the former is an open-loop control method, simple to implement and widely used. Additionally, six diodes VD7 to VD12 provide a circuit for the system. When the IGBTs are off, the inductance in the motor load generates energy, which flows to the DC side through the freewheeling diodes and is absorbed by the bus capacitor. The diodes provide a path for the reactive current generated by the motor load to be fed back to the DC side, achieving energy exchange. In actual production, the freewheeling diodes are integrated into the switching transistors, so they do not need to be added when building the hardware experimental circuit.

[0039] Working Principle: When the operator presses the "Close Door" button, the frequency converter control module first controls the drive motor to run at a relatively high speed (e.g., 30Hz), causing the protective door to close quickly. When the protective door reaches a certain distance from the ground (fully closed position) (e.g., 20cm), it first triggers the lower limit switch (or a dedicated deceleration switch) which serves as the "preset deceleration point." At this time, the frequency converter control module receives this signal and immediately outputs a command to smoothly reduce the operating frequency of the drive motor to a lower speed (e.g., 5Hz). Thus, the protective door slowly approaches and eventually closes completely at this low speed, achieving a gentle, shock-free buffering effect. The opening process is similar; when approaching the fully open position, deceleration is triggered by the upper limit switch.

[0040] Specifically, in order to improve the level of intelligence and security, this embodiment adds more functional units.

[0041] This utility model is also connected to a manual operation unit (e.g., an operation box with open, close, and emergency stop buttons) for convenient on-site operation.

[0042] Simultaneously, a fault alarm unit (e.g., an audible and visual alarm) is also connected. The frequency converter control module can monitor the motor current in real time. If the current is abnormally high (which may indicate jamming) or the door status detection module signal fails to trigger continuously (which may indicate a switch malfunction or door derailment), the motor will be stopped immediately and the fault alarm unit 105 will be activated to remind personnel to carry out maintenance.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A buffer device for a protective door of a wire stacking machine, characterized in that, include: Variable frequency control module, door status detection module, and drive motor; The door status detection module is used to detect the open or closed position signal of the protective door; The frequency conversion control module is electrically connected to the door status detection module and the drive motor. It is used to receive the position signal and output a frequency conversion drive signal to the drive motor according to the preset control logic to control the start, stop and speed of the drive motor, so as to realize the deceleration buffer when the protective door is close to the limit position.

2. The buffer device for the protective door of a wire stacking machine according to claim 1, characterized in that, The door status detection module includes an upper limit switch and a lower limit switch, which are respectively set at the corresponding positions when the protective door is fully open and fully closed.

3. The buffer device for the protective door of a wire stacking machine according to claim 2, characterized in that, The preset control logic of the frequency conversion control module is as follows: when the door status detection module detects that the protective door is running to a preset deceleration point close to the upper or lower limit, the frequency conversion control module controls the drive motor to switch from high-speed operation to low-speed operation.

4. The buffer device for the protective door of a wire stacking machine according to claim 1, characterized in that, The frequency conversion control module is also connected to a manual operation unit, which is used to receive manually input instructions to open, close, or stop the door.

5. A buffer device for a protective door of a wire stacking machine according to claim 1, characterized in that, The frequency conversion control module is also connected to a fault alarm unit. When the drive motor operates abnormally or the door status detection module signal fails, the fault alarm unit issues a warning.

6. The buffer device for the protective door of a wire stacking machine according to claim 1, characterized in that, The frequency conversion control module includes: a DSP control circuit, a rectifier circuit, and an inverter circuit; The input terminal of the rectifier circuit is connected to the power supply, and the output terminal is connected to the input terminal of the inverter circuit. The output terminal of the inverter circuit is connected to the motor. The DSP control circuit is connected to both the rectifier circuit and the inverter circuit.

7. A buffer device for a protective door of a wire stacking machine according to claim 6, characterized in that, The rectifier circuit includes: a first diode VD1, a second diode VD2, a third diode VD3, a fourth diode VD4, a fifth diode VD5, a sixth diode VD6, a current-limiting resistor RL, a thirteenth diode VD13, a seventh fully controlled device VT7, a first capacitor CD1, and a second capacitor CD2. The anode of the first diode VD1 is connected to the cathode of the second diode VD2 and connected to AC power supply R. The anode of the third diode VD3 is connected to the cathode of the fourth diode VD4 and connected to AC power supply S. The anode of the fifth diode VD5 is connected to the cathode of the sixth diode VD6 and connected to AC power supply T. One end of the current-limiting resistor RL is simultaneously connected to the cathodes of the first diode VD1, the third diode VD3, and the secondary cathode of the fifth diode VD5, and the other end is simultaneously connected to the collector of the seventh fully controlled device VT7, the cathode of the thirteenth diode VD13, and the anode of the first capacitor CD1, and connected to the inverter circuit. The anode of the second capacitor CD2 is simultaneously connected to the emitter of the seventh fully controlled device VT7 and the anode of the thirteenth diode VD13, and the cathode is simultaneously connected to the anodes of the second diode VD2, the fourth diode VD4, the sixth diode VD6, and the cathode of the first capacitor CD1, and connected to the inverter circuit.

8. A buffer device for a protective door of a wire stacking machine according to claim 7, characterized in that, The inverter circuit includes: a first fully controlled device VT1, a second fully controlled device VT2, a third fully controlled device VT3, a fourth fully controlled device VT4, a fifth fully controlled device VT5, a sixth fully controlled device VT6, a seventh diode VD7, an eighth diode VD8, a ninth diode VD9, a tenth diode VD10, an eleventh diode VD11, and a twelfth diode VD12; The emitter of the first fully controllable device VT1 and the anode of the seventh diode VD7 are connected to the collector of the fourth fully controllable device VT4 and the cathode of the eighth diode VD8, and are also connected to the U terminal of the motor. The emitter of the third fully controllable device VT3 and the anode of the ninth diode VD9 are connected to the collector of the sixth fully controllable device VT6 and the cathode of the tenth diode VD10, and are also connected to the V terminal of the motor. The emitter of the fifth fully controllable device VT5 and the anode of the eleventh diode VD11 are connected to the collector of the second fully controllable device VT2 and the cathode of the twelfth diode VD12. The negative terminal is connected to the W terminal of the motor. The collector of the first fully controllable device VT1 and the negative terminal of the seventh diode VD7, the collector of the third fully controllable device VT3 and the negative terminal of the ninth diode VD9 are connected to the collector of the fifth fully controllable device VT5 and the negative terminal of the eleventh diode VD11. The emitter of the fourth fully controllable device VT4 and the positive terminal of the eighth diode VD8, the emitter of the sixth fully controllable device VT6 and the positive terminal of the tenth diode VD10 are connected to the emitter of the second fully controllable device VT2 and the positive terminal of the twelfth diode VD12.

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