A control circuit and apparatus for a plastic shredder

Abstract

The embodiment of the application provides a control circuit and equipment for a plastic crusher, the control circuit comprises a pulse regulator, a solid-state relay and a solenoid valve, the pulse regulator is connected with the solenoid valve through the solid-state relay; the pulse regulator is used for outputting a pulse signal to the solid-state relay and controlling a crushing speed when the plastic crusher performs a plastic crushing work; the solid-state relay is used for controlling on-off states of the solenoid valve based on the pulse signal; and the plastic crusher is used for performing the plastic crushing work based on the on-off states of the solenoid valve, so as to realize automatic control of the crushing speed and improve the quality of plastic particles after crushing.

Description

Technical Field

[0001] This application relates to the field of plastic processing equipment, and more particularly to a control circuit and device for a plastic crusher. Background Technology

[0002] In the production of plastic films and sheets, a large amount of transitional sheet-like plastic is generated due to the need for machine shutdowns and restarts, production switching, process adjustments, or handling of film breakage. To reduce environmental pollution during production, these sheet-like plastics are typically collected using metal trays and solidified into sheets after cooling. However, the handling of these sheet-like plastics presents several problems, such as overhead crushing and feeding, and the need for multiple stages of crushing or pre-cutting. These issues not only increase production costs but also affect production efficiency.

[0003] In addition, the crushing speed of plastic crushers currently on the market is difficult to control precisely when processing this type of plastic. This makes it difficult for the crushing process to adapt to plastic slabs of different hardness and thickness, affecting the crushing effect and the subsequent granulation quality. Utility Model Content

[0004] The main objective of this application is to provide a control circuit and device for a plastic crusher, which aims to automatically control the crushing speed and improve the quality of the crushed plastic particles.

[0005] To achieve the above objectives, a first aspect of this application provides a control circuit for a plastic crusher, the control circuit comprising:

[0006] A pulse regulator, a solid-state relay, and a solenoid valve, wherein the pulse regulator is connected to the solenoid valve via the solid-state relay;

[0007] The pulse regulator is used to output pulse signals to the solid-state relay and to control the crushing speed of the plastic crusher when it is crushing plastic.

[0008] The solid-state relay is used to control the on / off state of the solenoid valve based on the pulse signal;

[0009] The plastic crusher is used to crush plastics based on the on / off state of the solenoid valve.

[0010] The control circuit provided in the first aspect can dynamically adjust the crushing speed based on the feeding state and crushing resistance of the plate-shaped plastic. Stable speed control can avoid particle size deviation caused by speed fluctuations during crushing, improve the quality of crushed plastic particles, reduce manual operation intensity, reduce equipment failures caused by human judgment errors, and significantly reduce energy consumption and maintenance costs per unit product.

[0011] In one possible implementation, the solid-state relay is a high-level active solid-state relay, and the solid-state relay is used to control the on / off state of the solenoid valve based on the pulse signal, including:

[0012] When the pulse signal is a high-level pulse signal, the solid-state relay is used to control the solenoid valve to turn on based on the high-level pulse signal;

[0013] When the pulse signal is a low-level pulse signal, the solid-state relay is used to control the solenoid valve to open based on the low-level pulse signal.

[0014] In one possible implementation, the plastic crusher includes a cylinder and a blade connected to the cylinder, the cylinder including a spring, and the plastic crusher for performing plastic crushing operations based on the on / off state of the solenoid valve includes:

[0015] The plastic crusher is used to control the cylinder to rise when the solenoid valve is turned on, so as to compress the spring and lift the blade;

[0016] The plastic crusher is used to discharge the air in the cylinder when the solenoid valve is disconnected, causing the spring to rebound and push the cutter downward to crush the plastic.

[0017] In one possible implementation, the pulse regulator is a square wave pulse regulator.

[0018] In one possible implementation, the solenoid valve is a two-position three-way solenoid valve.

[0019] In one possible implementation, the control circuit further includes a switching module connected to both ends of the pulse regulator, wherein the switching module includes a first switch, a second switch, a third switch, and a power converter;

[0020] The first switch is connected to the power converter, the first terminal of the power converter is connected to the first terminal of the second switch, the second terminal of the power converter is connected to the second terminal of the pulse regulator, the second terminal of the second switch is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the first terminal of the pulse regulator.

[0021] In one possible implementation, the control circuit further includes a fuse module connected to the first switch.

[0022] In one possible implementation, the control circuit further includes a display module connected to both ends of the pulse regulator. The display module includes a first resistor, a first light-emitting diode (LED), and a second LED. The first resistor and the second LED are connected in series and then connected in parallel with the first LED.

[0023] In a second aspect, an electronic device is provided, which, when executed, implements a control circuit for a plastic crusher as described in any possible implementation of the first aspect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the control circuit for a plastic crusher provided in an embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the control circuit for a plastic crusher provided in an embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the structure of the plastic crusher provided in the embodiments of this application;

[0027] Reference numerals: Pulse regulator A1, solid-state relay A2, solenoid valve S, switch module 100, first switch Qs, second switch Q1, third switch PB, power converter P, fuse module Fu, display module 200, first resistor Km, first light-emitting diode L1, second light-emitting diode L2. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described one or more embodiments are merely some embodiments of this specification, and not all embodiments. All other embodiments obtained by those skilled in the art based on one or more embodiments of this specification without creative effort should fall within the protection scope of this document.

[0029] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0031] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other. The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0032] Firstly, such as Figure 1 and Figure 2 As shown, a control circuit for a plastic crusher is provided. The control circuit includes a pulse regulator A1, a solid-state relay A2, and a solenoid valve S. The pulse regulator A1 is connected to the solenoid valve S through the solid-state relay A2. The pulse regulator A1 is used to output pulse signals to the solid-state relay A2 and control the crushing speed of the plastic crusher when it is crushing plastic. The solid-state relay A2 is used to control the on / off state of the solenoid valve S based on the pulse signals. The plastic crusher is used to crush plastic based on the on / off state of the solenoid valve S.

[0033] It should be noted that the control circuit of the plastic crusher includes a pulse regulator A1, a solid-state relay A2, and a solenoid valve S. The pulse regulator A1 is connected to the solenoid valve S through the solid-state relay A2. The pulse regulator A1 is used to output pulse signals to the solid-state relay A2 to control the on / off state of the solid-state relay A2. The solid-state relay A2 controls the on / off state of the solenoid valve S based on its own on / off state. The plastic crusher performs plastic crushing work based on the on / off state of the solenoid valve S.

[0034] It should also be noted that, in addition to outputting pulse signals to control the solid-state relay A2, the pulse regulator A1 is also used to control the crushing speed of the plastic crusher. The pulse regulator A1 is a device that precisely controls the output voltage, current, or power by changing the duty cycle of the pulse signal. Considering the high hardness and irregular shape of plate-shaped plastics, the pulse regulator A1 can dynamically change the working power of the plastic crusher by adjusting the duty cycle of the output pulse in real time. When the plastic crusher is crushing large pieces of plastic, causing the load to increase, the pulse regulator A1 automatically increases the pulse width to cope with high-resistance crushing. When the material particle size decreases and the load decreases, it decreases the duty cycle, reduces the speed, and maintains stable output. This avoids the equipment shock caused by "sudden speed changes" in traditional mechanical speed regulation, making the crushing process smoother, reducing equipment wear caused by load fluctuations, and extending the service life of the cutting tools.

[0035] Furthermore, the solid-state relay A2, based on a semiconductor switch without mechanical contacts, boasts a response time down to the microsecond level. Combined with the pulse signal output from the pulse regulator A1, it can rapidly execute on / off actions. When the pulse regulator A1 outputs pulse signals with different duty cycles according to the crushing load of the slab-shaped plastic, the solid-state relay A2 precisely regulates the input power of the plastic crusher by changing the ratio of its on / off time. For example, when the plastic crusher crushes large pieces of plastic, causing the load to increase, the pulse regulator A1 automatically increases the pulse width, and the on time of the solid-state relay A2 is extended, allowing the plastic crusher to obtain higher power. Conversely, when the material particle size decreases and the load decreases, the duty cycle is reduced, and the off time of the solid-state relay A2 is extended, resulting in a decrease in the power obtained by the plastic crusher. This responsive characteristic shortens the power regulation lag time, avoiding the power matching lag problem caused by the slow response of traditional relays. This ensures that the crushing process is always precisely matched with the material load, reducing energy waste caused by insufficient power leading to material jamming or excessive power.

[0036] It should also be noted that the plastic crusher operates based on the on / off state of the solenoid valve S. When the solenoid valve S is on, the plastic crusher immediately starts or increases its crushing power. When the solenoid valve S is off, the plastic crusher synchronously reduces its speed or enters standby mode. This effectively avoids the situation in traditional crushing where the feeding and crushing rhythms are out of sync, causing the plates to accumulate and block the crushing chamber or the equipment to run idle when there is no material. This improves the energy utilization rate of the crushing process and reduces the wear of the blades caused by hard impacts.

[0037] The control circuit provided in the first aspect can dynamically adjust the crushing speed based on the feeding state and crushing resistance of the plate-shaped plastic. Stable speed control can avoid particle size deviation caused by speed fluctuations during crushing, improve the quality of crushed plastic particles, reduce manual operation intensity, reduce equipment failures caused by human judgment errors, and significantly reduce energy consumption and maintenance costs per unit product.

[0038] In one possible implementation, the solid-state relay is a high-level active solid-state relay, and the solid-state relay is used to control the on / off state of the solenoid valve based on the pulse signal, including: when the pulse signal is a high-level pulse signal, the solid-state relay is used to control the solenoid valve to be turned on based on the high-level pulse signal; when the pulse signal is a low-level pulse signal, the solid-state relay is used to control the solenoid valve to be turned off based on the low-level pulse signal.

[0039] It should be noted that, in one embodiment, the solid-state relay is a high-level active solid-state relay. When the pulse signal is a high-level pulse signal, the solid-state relay is used to control the solenoid valve to turn on based on the high-level pulse signal; when the pulse signal is a low-level pulse signal, the solid-state relay is used to control the solenoid valve to turn off based on the low-level pulse signal. The high-level pulse output by the pulse regulator A1 can directly trigger the solid-state relay to turn on, and the low-level pulse will turn it off, eliminating the need for additional signal conversion circuits. This reduces the delay in signal transmission, ensures that the power regulation of the plastic crusher is synchronized with the pulse duty cycle change, and avoids power redundancy.

[0040] In one possible implementation, the plastic crusher includes a cylinder and a blade connected to the cylinder. The cylinder includes a spring. The plastic crusher is used to perform plastic crushing based on the on / off state of the solenoid valve by: controlling the cylinder to rise when the solenoid valve is on, compressing the spring to lift the blade; and venting air from the cylinder when the solenoid valve is off, causing the spring to rebound and push the blade downward to crush the plastic.

[0041] It should be noted that, for example Figure 3 As shown, the plastic crusher includes a cylinder and blades connected to the cylinder. The cylinder includes a spring and a mold corresponding to the blades. When the solenoid valve is open, the crusher controls the cylinder to rise, compressing the spring and lifting the blades. When the solenoid valve is closed, air is expelled from the cylinder, causing the spring to rebound and push the blades downwards, cooperating with the mold to crush the plastic. Addressing the potential issues of sharp edges and uneven hardness in plate-shaped plastics, the flexible driving force of the spring adapts to the material's shape. When the blades encounter localized hard points, the spring slightly compresses to buffer the impact, preventing equipment overload. After crushing, the solenoid valve opens, causing the blades to quickly lift and completely separate from the material, reducing the risk of material sticking to the blades and extending their service life.

[0042] In one possible implementation, the pulse regulator is a square wave pulse regulator.

[0043] It should be noted that in some embodiments, the pulse regulator is a square wave pulse regulator, and the output pulse signal is a square wave pulse. The core parameter of the square wave pulse is the duty cycle. The pulse regulator can linearly adjust the output energy by changing this parameter. When processing hard or large block-shaped plastics, a high duty cycle pulse is output to prolong the conduction time of the solid-state relay, enabling the motor to obtain continuous high power, which, combined with the spring driving force, forms a strong crushing force. When processing thinner or finer materials, the duty cycle is reduced to decrease the power output and avoid over-crushing. In addition, the output frequency of the square wave pulse regulator can usually be adjusted within the range of 0.5Hz-10kHz. The square wave pulse can drive the solid-state relay to achieve high-speed switching, enabling the plastic crusher to complete power switching within milliseconds.

[0044] In one possible implementation, the solenoid valve is a two-position three-way solenoid valve.

[0045] It should be noted that the two-position three-way solenoid valve only requires three ports: an inlet, an outlet, and an exhaust port to complete the air circuit control. No additional check valve or throttle valve is required. When the solenoid valve is de-energized, the inlet is closed and the exhaust port is open, allowing compressed air in the cylinder to be quickly discharged through the exhaust port. When the solenoid valve is energized, the inlet is open and the exhaust port is closed, allowing compressed air to enter the cylinder from the inlet. The two-position three-way solenoid valve has a wide operating air pressure range, and even when the air source pressure fluctuates, it can still ensure reliable tool drop action through rapid exhaust, without the need for additional pressure stabilizing equipment.

[0046] In one possible implementation, such as Figure 2 As shown, the control circuit further includes a switch module 100, which is connected to both ends of the pulse regulator A1. The switch module 100 includes a first switch Qs, a second switch Q1, a third switch PB, and a power converter P. The first switch Qs is connected to the power converter P, the first end of the power converter P is connected to the first end of the second switch Q1, the second end of the power converter P is connected to the second end of the pulse regulator A1, the second end of the second switch Q1 is connected to the first end of the third switch PB, and the second end of the third switch PB is connected to the first end of the pulse regulator A1.

[0047] It should be noted that the control circuit also includes a switch module 100, which is connected to both ends of the pulse regulator A1. The switch module 100 includes a first switch Qs, a second switch Q1, a third switch PB, and a power converter P. The first switch Qs is connected to the power converter P, the first end of the power converter P is connected to the first end of the second switch Q1, the second end of the power converter P is connected to the second end of the pulse regulator A1, the second end of the second switch Q1 is connected to the first end of the third switch PB, and the second end of the third switch PB is connected to the first end of the pulse regulator A1. The first switch Qs serves as a power switch, controlling the connection between the circuit and the external power supply. When the first switch Qs is closed, the circuit receives power and has the basic conditions for operation. When the first switch Qs is open, the entire circuit is powered off, and all electrical equipment and control components cease operation, providing overall power supply control and safety isolation. The second switch Q1 serves as the power control switch for its branch. When the second switch Q1 is closed, the voltage output from the power converter P is available. Opening the second switch Q1 disconnects the power supply to that branch independently, facilitating maintenance and adjustment of the branch. The test does not affect the basic power supply or status display of other parts, realizing the relatively independent control of the control branch from the main power supply and other branches. For example, when pulse regulation, solenoid valve control and other operations are not required, the second switch Q1 can be disconnected to reduce the overall power consumption of the circuit and prevent the failure of this branch from affecting the normal operation of other parts. The third switch PB is used to control the input of the pulse signal, that is, to manually start the pulse regulator A1. When the second switch Q1 is closed and the third switch PB is pressed, a trigger signal will be sent to the pulse regulator A1 to start the pulse regulator A1 to work, which improves the flexibility of the circuit.

[0048] In one possible implementation, such as Figure 2 As shown, the control circuit also includes a fuse module Fu, which is connected to the first switch Qs.

[0049] It should be noted that if a short circuit occurs in the circuit, such as a short circuit inside the solenoid valve S or other electrical components, or if the insulation of the wires in the circuit is damaged, causing direct contact between the live wire and the neutral wire, the current in the circuit will increase sharply and instantaneously. When a large current passes through, the fuse in the fuse module Fu will generate a large amount of heat due to its own resistance, and its temperature will rise rapidly. When the temperature reaches the melting point of the fusible element, the fusible element will melt and break the circuit, thus preventing the excessive short-circuit current from damaging other components in the circuit and avoiding more serious safety accidents such as electrical fires caused by short circuits, ensuring the safety of the entire circuit system. In addition, when the load in the circuit exceeds its rated operating state and there is prolonged overload operation, the current through the fuse will also exceed its rated current. The prolonged overload current will cause the temperature of the fusible element to rise. After a certain period of time, the fusible element will melt and break the circuit, preventing overheating damage to components due to overload.

[0050] In one possible implementation, such as Figure 2 As shown, the control circuit also includes a display module 200, which is connected to both ends of the pulse regulator A1. The display module 200 includes a first resistor Km, a first light-emitting diode L1, and a second light-emitting diode L2. The first resistor Km and the second light-emitting diode L2 are connected in series and then connected in parallel with the first light-emitting diode L1.

[0051] It should be noted that the control circuit also includes a display module 200, which is connected to both ends of the pulse regulator A1. The display module 200 includes a first resistor Km, a first light-emitting diode L1, and a second light-emitting diode L2. The first resistor Km and the second light-emitting diode L2 are connected in series and then in parallel with the first light-emitting diode L1. The first light-emitting diode L1 serves as a power indicator. When the first switch Qs is closed, the circuit is connected to mains power, and the subsequent power supply circuit is normal, the first light-emitting diode L1 lights up, indicating that the entire circuit is energized and operational, allowing the operator to quickly determine whether the circuit is receiving effective power. The second light-emitting diode L2 serves as a start indicator. When the first switch Qs, the second switch Q1, and the third switch PB are all closed, the second light-emitting diode L2 lights up, indicating that the control process has started, assisting in determining whether the control link is operating normally and narrowing down the scope of fault diagnosis.

[0052] In a second aspect, an electronic device is provided, which, when executed, implements a control circuit for a plastic crusher as described in any possible implementation of the first aspect.

[0053] The electronic equipment provided in the second aspect can dynamically adjust the crushing speed based on the feeding state and crushing resistance of the plate-shaped plastic. Stable speed control can avoid particle size deviation caused by speed fluctuations during the crushing process, improve the quality of crushed plastic particles, reduce manual operation intensity, reduce equipment failures caused by human judgment errors, and significantly reduce energy consumption and maintenance costs per unit product.

[0054] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0055] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0056] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control circuit for a plastic crusher, characterized in that, The control circuit includes a pulse regulator, a solid-state relay, and a solenoid valve, wherein the pulse regulator is connected to the solenoid valve through the solid-state relay. The pulse regulator is used to output pulse signals to the solid-state relay and to control the crushing speed of the plastic crusher when it is crushing plastic. The solid-state relay is used to control the on / off state of the solenoid valve based on the pulse signal; The plastic crusher is used to crush plastics based on the on / off state of the solenoid valve.

2. The control circuit according to claim 1, characterized in that, The solid-state relay is a high-level active solid-state relay, and the solid-state relay is used to control the on / off state of the solenoid valve based on the pulse signal, including: When the pulse signal is a high-level pulse signal, the solid-state relay is used to control the solenoid valve to turn on based on the high-level pulse signal; When the pulse signal is a low-level pulse signal, the solid-state relay is used to control the solenoid valve to open based on the low-level pulse signal.

3. The control circuit according to claim 1, characterized in that, The plastic crusher includes a cylinder and a blade connected to the cylinder. The cylinder includes a spring. The plastic crusher is used to perform plastic crushing based on the on / off state of the solenoid valve, including: The plastic crusher is used to control the cylinder to rise when the solenoid valve is turned on, so as to compress the spring and lift the blade; The plastic crusher is used to discharge the air in the cylinder when the solenoid valve is disconnected, causing the spring to rebound and push the cutter downward to crush the plastic.

4. The control circuit according to claim 1, characterized in that, The pulse regulator is a square wave pulse regulator.

5. The control circuit according to claim 1, characterized in that, The solenoid valve is a two-position three-way solenoid valve.

6. The control circuit according to claim 1, characterized in that, The control circuit also includes a switching module connected to both ends of the pulse regulator, wherein the switching module includes a first switch, a second switch, a third switch, and a power converter; The first switch is connected to the power converter, the first terminal of the power converter is connected to the first terminal of the second switch, the second terminal of the power converter is connected to the second terminal of the pulse regulator, the second terminal of the second switch is connected to the first terminal of the third switch, and the second terminal of the third switch is connected to the first terminal of the pulse regulator.

7. The control circuit according to claim 6, characterized in that, The control circuit also includes a fuse module, which is connected to the first switch.

8. The control circuit according to claim 1, characterized in that, The control circuit also includes a display module, which is connected to both ends of the pulse regulator. The display module includes a first resistor, a first light-emitting diode, and a second light-emitting diode. The first resistor and the second light-emitting diode are connected in series and then connected in parallel with the first light-emitting diode.

9. An electronic device, characterized in that, The electronic device includes the control circuit for a plastic crusher as described in any one of claims 1-8.

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