An automatic edge material feeding device

Abstract

The utility model aims to provide an automatic side material delivery device, comprising a crusher, a current converter, a hysteresis comparison circuit, a frequency converter and a side material pulling machine connected in sequence; wherein the crusher comprises a crusher motor, and the side material pulling machine comprises a side material pulling motor; the crusher motor is used to drive the crusher to work and output the operating current; the current converter is connected to the output end of the crusher motor, and converts the input current into an output voltage; the input end of the hysteresis comparison circuit is connected to the output end of the current converter, and the output voltage is compared with a threshold voltage to obtain a switching voltage; the frequency converter is used to switch the operating frequency of the side material pulling motor according to the switching voltage to control the side material pulling speed, and can adjust the rate at which the side material pulling machine delivers the side materials into the crusher in real time, thereby realizing real-time control of the side material delivery speed and ensuring that the side material delivery amount remains within an appropriate range.

Description

Technical Field

[0001] The utility model relates to the technical field of film production, in particular to an automatic edge material feeding device. Background Art

[0002] In order to improve the yield rate of the film production line, the narrow edge materials generated by the slitting process are usually added to the main materials for recycling. However, if the amount of edge materials added during the production process is not appropriate, two situations will occur. Either the feeding efficiency is low, or the crusher is stuck due to excessive feeding.

[0003] In order to avoid the above problems and prevent the crusher from getting stuck, it is usually necessary to manually adjust the speed of releasing the side material, or to improve the internal mechanical structure of the crusher so that when the material is blocked, the crusher can be prevented from getting stuck by accommodating or transferring the remaining material.

[0004] However, manual adjustment of the speed of releasing the side materials is too dependent on experience, and the feeding effect is unstable. Although improving the internal mechanical structure of the crusher can alleviate the risk of crusher blockage to a certain extent, there is still secondary energy consumption caused by transporting the remaining materials to the crusher, and there is still a risk of crusher blockage under high-speed operation. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide an automatic edge material feeding device to ensure that the amount of edge material fed into the crusher during the film production process remains appropriate. Specifically, the automatic edge material feeding device includes:

[0006] A crusher, a current converter, a hysteresis comparison circuit, a frequency converter and a side feeder connected in sequence;

[0007] The crusher includes a crusher motor, and the edge material pulling machine includes an edge material pulling motor;

[0008] The crusher motor is used to drive the crusher to work and output operating current;

[0009] The current converter is connected to the output end of the crusher motor to convert the input current into an output voltage;

[0010] The input end of the hysteresis comparison circuit is connected to the output end of the current converter, and the output voltage is compared with the threshold voltage to obtain a switching voltage;

[0011] The frequency converter is used to switch the operating frequency of the edge material pulling motor according to the switching voltage to control the edge material pulling speed.

[0012] The present application uses a current converter to digitize the load condition of the crusher, and then generates a switching voltage according to the working condition of the crusher motor based on the high and low threshold circuit characteristics of the hysteresis comparison circuit. The rate at which the side material pulling machine feeds the side material into the crusher can be adjusted in real time, thereby achieving real-time control of the side material feeding speed and ensuring that the side material feeding amount remains within an appropriate range.

[0013] Furthermore, it also includes a current transformer, one end of which is connected to the crusher motor, and the other end of which is connected to the current converter, for scaling the output current so that the output current matches the current converter.

[0014] The current transformer can realize the conversion between large and small currents, so that the current generated by the crusher motor matches the working range of the current converter, ensuring the reliability of the device.

[0015] Furthermore, the frequency converter includes a high-frequency operation switch and a low-frequency mode switch, wherein a relay is arranged on the low-frequency mode switch.

[0016] Furthermore, the output end of the hysteresis comparison circuit is also connected to a relay control circuit:

[0017] The relay control circuit includes a MOS tube, a resistor R5, a resistor R6, a power supply, a relay K1 and a diode;

[0018] The gate of the MOS tube is connected to the output end of the comparator, and the drain of the MOS tube is connected to the relay; the source of the MOS tube is connected to the resistor R6, and a section of the resistor R6 that is not connected to the MOS tube is grounded;

[0019] The resistor R5 is arranged between the gate and the source of the MOS tube;

[0020] The relay K1 is connected in parallel with the diode.

[0021] Furthermore, the percentage of the output current of the crusher to its rated current is consistent with the percentage of the output voltage of the current converter to its rated voltage.

[0022] Further, the hysteresis comparison circuit includes a power supply, a variable resistor R1, a resistor R2, a resistor R3, a resistor R4, and a comparator;

[0023] The comparator comprises a positive input terminal, a negative input terminal, a positive power supply terminal, a negative power supply terminal and an output terminal, the positive input terminal is used to receive the output voltage of the current converter, and the negative input terminal is used to input a threshold voltage;

[0024] The variable resistor R1, the resistor R3 and the positive power supply terminal of the comparator are connected to the power supply;

[0025] The variable resistor R1, the resistor R2, and the resistor R4 are connected to the negative input terminal of the comparator;

[0026] The resistor R2 and the negative power supply terminal of the comparator are grounded;

[0027] The resistor R3 and the resistor R4 are connected to the output end of the comparator.

[0028] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A structural block diagram of an exemplary automatic edge material delivery device provided in the present application;

[0030] Figure 2 A structural block diagram of another exemplary automatic edge material delivery device provided in the present application;

[0031] Figure 3 A circuit diagram of a relay control circuit in an embodiment provided by the present application;

[0032] Figure 4 A circuit diagram of a crusher current control circuit in an embodiment provided by the present application;

[0033] The technical solution of the present utility model will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application.

[0034] 1: Crusher; 10: Crusher motor; 2: Current converter; 3: Hysteresis comparison circuit; 31: Comparator; 311: Positive input terminal; 312: Negative input terminal; 313: Positive power supply terminal; 314: Negative power supply terminal; 315: Output terminal of comparator; 4: Frequency converter; 5: Edge pulling machine; 50: Edge pulling motor; 6: Current transformer. DETAILED DESCRIPTION

[0035] In the process of recycling scraps, when scraps are normally put in, the speed for putting in scraps is constant. However, due to the inherent defects of the mechanical structure, some materials may stagnate in the crusher during the crushing process, affecting the crushing efficiency. Although the initial feeding speed will not cause the crusher to be blocked, as the amount of crushed materials accumulated in the blades of the crusher increases, the crushing efficiency will decrease. This application is based on the fact that the amount of scraps inside the crusher will affect the current of the crusher motor, that is, although the crushing efficiency will change over time, the amount of scraps inside the crusher can be judged by the current change of the crusher motor. When the amount of scraps in the crusher does not exceed one frequency converter, the risk of the crusher being blocked is very low, and we can control the speed of putting in scraps by the current change of the crusher motor, so as to avoid the blockage of the crusher without affecting the feeding efficiency.

[0036] Based on the above analysis, this application proposes an automatic edge material delivery device, please refer to Figure 1 , Figure 1 This is a structural block diagram of an exemplary automatic side material delivery device provided in the present application, which comprises: a crusher 1, a current converter 2, a hysteresis comparison circuit 3, a frequency converter 4 and a side material pulling machine 5 connected in sequence;

[0037] The crusher 1 includes a crusher motor 10 , and the side material pulling machine 5 includes a side material pulling motor 50 .

[0038] In this embodiment, when the crusher 1 is running, the motor current varies between 0 and the rated current In. At this time, the current converter 2 outputs a voltage of 0 to 10V, corresponding to 0 to 100% In, so that the working range of the current converter 2 matches the threshold current range of the crusher motor 10.

[0039] The crusher motor 10 is used to drive the crusher 1 to work and output operating current;

[0040] The current converter 2 is connected to the output end of the crusher motor 10 to convert the input current into an output voltage;

[0041] The input terminal of the hysteresis comparison circuit 3 is connected to the output terminal of the current converter 2, and compares the output voltage with the threshold voltage to obtain a switching voltage.

[0042] The working principle of the hysteresis comparison circuit is to compare the input signal with the threshold signal (Utl, Uth), and output the corresponding logic signal according to the size relationship. The core part of the hysteresis comparison circuit is a nonlinear circuit, through which the hysteresis effect can be realized. When the input signal exceeds the high threshold signal, the output signal is high; when the input signal is lower than the low threshold signal, the output signal is low. When the input signal is close to the threshold signal, the output signal will have a hysteresis effect, that is, the output signal will not change immediately, and it is necessary to wait until the input signal exceeds or falls below a preset threshold voltage before the inverter 4 will flip, thereby ensuring the stability of the output signal.

[0043] The frequency converter 4 is used to switch the operating frequency of the edge material drawing motor 50 according to the switching voltage to control the edge material drawing speed. Preferably, the frequency converter 4 includes a high-frequency operation switch and a low-frequency mode switch, wherein a relay is arranged on the low-frequency mode switch.

[0044] In this embodiment, the current of the crusher 1 changes according to the amount of side material put in. Under normal side material putting, the current of the crusher motor 10 runs at 90% of the rated current Ui≈9V, and the hysteresis comparison circuit output voltage Uo is high. If the amount of side material put in is continuously increased, the current of the crusher motor 10 will continue to rise, and the output voltage value Ui of the current converter 2 will increase accordingly. When the motor current rises to more than 90% of the rated current, Ui≥Uth(9V), the crusher 1 is at risk of being blocked, the output voltage Uo of the hysteresis comparison circuit is switched to a low level, the relay K1 is opened (normally closed point is connected), and the frequency converter 4 is switched to a low frequency mode, that is, it runs at a frequency of 20Hz, the side material pulling motor 50 is decelerated, the feeding amount is reduced, and the current of the crusher 1 is reduced, which effectively prevents the crusher 1 from being blocked. After the side material pulling motor 50 slows down, the voltage value Ui becomes smaller. When the Ui value is ≤5V (low threshold Utl), the output voltage Uo of the hysteresis comparison circuit switches to a high level, the relay K1 is energized, and the inverter 4 switches to the high-frequency mode again, that is, it runs forward at 50Hz, the side material pulling motor 50 speeds up, and the feeding amount increases.

[0045] The present application uses a current converter 2 to digitize the load condition of the crusher 1, and then generates a switching voltage according to the working condition of the crusher motor 10 based on the high and low threshold circuit characteristics of the hysteresis comparison circuit 3. The rate at which the side material pulling machine 5 feeds the side material into the crusher 1 can be adjusted in real time, thereby achieving real-time control of the side material feeding speed and ensuring that the side material feeding amount remains within an appropriate range.

[0046] See also Figure 2 In another embodiment, the automatic edge material delivery device also includes a current transformer, one end of the current transformer is connected to the crusher motor 10, and the other end is connected to the current converter, which is used to scale the output current so that the output current matches the current converter 2.

[0047] The current transformer is an instrument that converts the primary side large current into the secondary side small current for measurement based on the principle of electromagnetic induction. The current transformer is composed of a closed iron core and a winding. Its primary side winding has few turns and is connected in series in the circuit of the current to be measured. Therefore, it often has the entire current of the circuit flowing through it. The secondary side winding has more turns and is connected in series in the measuring instrument and protection circuit.

[0048] By adding a current transformer, the current generated by the crusher motor 10 is matched with the working range of the current converter 2, thereby ensuring the reliability of the device.

[0049] See also Figure 3 In another embodiment, the output end of the hysteresis comparison circuit is further connected to a relay control circuit:

[0050] The relay control circuit includes a MOS tube, a resistor R5, a resistor R6, a power supply, a relay K1 and a diode

[0051] The gate of the MOS tube is connected to the output terminal Uo of the hysteresis comparison circuit, and the drain of the MOS tube is connected to the relay; the source of the MOS tube is connected to the resistor R6, and a section of the resistor R6 not connected to the MOS tube is grounded;

[0052] The resistor R5 is arranged between the gate and the source of the MOS tube;

[0053] The relay K1 is connected in parallel with the diode.

[0054] At this time, when the output voltage of the hysteresis comparison circuit output terminal Uo is high, the gate and source of the MOS tube are turned on, and the drain voltage of the MOS is higher than the power supply voltage. The relay K1 is energized, and the low-frequency mode switch is closed; the inverter 4 switches to the low-frequency mode.

[0055] When the output voltage of the hysteresis comparison circuit output terminal Uo is low, although the gate and source of the MOS tube are still turned on, the drain voltage of the MOS is lower than the power supply voltage, and the diode is connected in parallel at both ends of the relay K1, and the relay K1 is short-circuited. At this time, the relay K1 is turned on, the high-frequency mode switch is closed, and the inverter 4 is switched to the high-frequency mode.

[0056] See also Figure 4 , in another embodiment, the hysteresis comparison circuit includes a power supply, a variable resistor R1, a resistor R2, a resistor R3, a resistor R4, and a comparator;

[0057] The comparator comprises a positive input terminal 311, a negative input terminal 312, a positive power supply terminal 313, a negative power supply terminal 314 and an output terminal 315 of the comparator, wherein the positive input terminal 311 is used to receive the output voltage of the current converter, and the negative input terminal 312 is used to input a threshold voltage;

[0058] The variable resistor R1, the resistor R3 and the positive power supply terminal 313 of the comparator are connected to the power supply;

[0059] The variable resistor R1, the resistor R2, and the resistor R4 are connected to the negative input terminal 312 of the comparator;

[0060] The resistor R2 and the negative power supply terminal 314 of the comparator are grounded;

[0061] The resistor R3 and the resistor R4 are connected to the output terminal 315 of the comparator.

[0062] In this embodiment, the low threshold voltage Utl and the high threshold voltage Uth are preset by the variable resistor R1, when R1 = 10KΩ;

[0063] R=(R2*R4) / (R2+R4)=100 / 20=5kΩ

[0064] U+=(R / (R+R1))*15V=(5 / (5+10))*15=5V, that is, Utl=5V.

[0065] R=(R3+R4)*R1 / ((R3+R4)+R1)=(10+10)*10 / ((10+10)+10)=20 / 3

[0066] U+=(R2 / (R+R2))*15V=9V, that is, Uth=9V.

[0067] When R1=20kΩ, Utl=3V, Uth=7.5V

[0068] The threshold voltage can be adjusted by a variable resistor, so that different crushers can be adapted by setting the group value of the variable band resistor, thereby increasing the adaptability of the device.

[0069] In summary, a specific application scenario of the present application is as follows: first, adjust the structure of R1 to pre-set the low threshold voltage and the high threshold voltage of the inverter, and then start the crusher 1. When running at no-load, the current of the crusher motor 10 is 30% In, the current converter output voltage Ui≈3V, the hysteresis comparison circuit output voltage Uo is high level, and the relay K1 is energized (normally closed point is disconnected). The crusher 1 pulls the side material motor 50 inverter 4, and the motor runs in the forward direction (STF control). The motor runs in high-frequency mode with the frequency set at 50Hz on the inverter 4 panel. At this time, the side materials to be recycled are sent to the crusher 1. As the amount of side material entering the crusher 1 increases, the current of the crusher 1 increases, and the current transmitted to the current converter by the current transformer also increases. At this time, although the output voltage Ui of the current converter increases, its output voltage is still less than the high threshold voltage of the hysteresis comparison circuit, so the feeding speed of the side material pulling machine 5 remains unchanged. However, when the motor current rises to more than 90% of the rated current, the output voltage Ui of the current converter is greater than the high threshold voltage, the output voltage Uo of the hysteresis comparison circuit switches to a low level, the relay K1 opens (normally closed point is connected), and the frequency converter 4 switches to a low-frequency mode, that is, it runs at a frequency of 20Hz, the side material pulling motor 50 slows down, the feeding amount is reduced, and the current of the crusher 1 is reduced, effectively preventing the crusher 1 from being blocked. After the side material pulling motor 50 slows down, the voltage value Ui becomes smaller. When Ui is less than the low threshold voltage, the output voltage Uo of the hysteresis comparison circuit switches to a high level, the relay K1 is closed, and the frequency converter 4 switches to a high-frequency mode again, that is, it runs at a forward speed of 50Hz, the side material pulling motor 50 speeds up, and the feeding amount increases. This reciprocating process can achieve the goal of avoiding the crusher 1 from being blocked without affecting the feeding efficiency.

[0070] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. An automatic edge material feeding device, characterized in that: include: A crusher, a current converter, a hysteresis comparison circuit, a frequency converter and a side feeder connected in sequence; The crusher includes a crusher motor, and the edge material pulling machine includes an edge material pulling motor; The crusher motor is used to drive the crusher to work and output operating current; The current converter is connected to the output end of the crusher motor to convert the input current into an output voltage; The input end of the hysteresis comparison circuit is connected to the output end of the current converter, and the output voltage is compared with the threshold voltage to obtain a switching voltage; The frequency converter is used to switch the operating frequency of the edge material pulling motor according to the switching voltage to control the edge material pulling speed.

2. The automatic edge material feeding device according to claim 1 is characterized in that: It also includes a current transformer, one end of which is connected to the crusher motor, and the other end is connected to the current converter, and is used to scale the output current so that the output current matches the current converter.

3. The automatic edge material feeding device according to claim 2 is characterized in that: The frequency converter comprises a high-frequency operation switch and a low-frequency mode switch, wherein a relay is arranged on the low-frequency mode switch.

4. The automatic edge material feeding device according to claim 3 is characterized in that: The output end of the hysteresis comparison circuit is also connected to a relay control circuit: The relay control circuit includes a MOS tube, a resistor R5, a resistor R6, a power supply, a relay K1 and a diode; The gate of the MOS tube is connected to the output end of the hysteresis comparison circuit, and the drain of the MOS tube is connected to the relay; the source of the MOS tube is connected to the resistor R6, and a section of the resistor R6 not connected to the MOS tube is grounded; The resistor R5 is arranged between the gate and the source of the MOS tube; The relay K1 is connected in parallel with the diode.

5. The automatic edge material feeding device according to claim 4 is characterized in that: The percentage of the rated current of the output current of the crusher is consistent with the percentage of the rated voltage of the output voltage of the current converter.

6. The automatic edge material feeding device according to claim 5, characterized in that: The hysteresis comparison circuit includes a power supply, a variable resistor R1, a resistor R2, a resistor R3, a resistor R4, and a comparator; The comparator comprises a positive input terminal, a negative input terminal, a positive power supply terminal, a negative power supply terminal and an output terminal, the positive input terminal is used to receive the output voltage of the current converter, and the negative input terminal is used to input a threshold voltage; The variable resistor R1, the resistor R3 and the positive power supply terminal of the comparator are connected to the power supply; The variable resistor R1, the resistor R2, and the resistor R4 are connected to the negative input terminal of the comparator; The resistor R2 and the negative power supply terminal of the comparator are grounded; The resistor R3 and the resistor R4 are connected to the output end of the comparator.

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