A leakage power-off protection tool for a coating machine

Abstract

This application relates to the field of leakage current protection technology for coating machines, and in particular to a leakage current cut-off protection tool for coating machines, which includes a housing assembly and an internal detection and execution assembly. The housing assembly consists of a main housing and a protective cover. The internal detection and execution assembly includes a current sensing module, a mechanical triggering module, and a circuit breaking module. The current sensing module monitors current changes through a magnetic core assembly and coil windings. When an abnormality occurs, it triggers the mechanical module to operate, which in turn drives the circuit breaking module to cut off the power circuit. This application optimizes the structural design and sealing performance, eliminates complex electronic components, reduces manufacturing costs, and improves adaptability and reliability in high-humidity or dusty environments. The overall structure is compact, facilitating installation and maintenance, significantly improving upon the shortcomings of existing technologies, and adapting to the needs of industrial environments.

Description

Technical Field

[0001] This utility model belongs to the field of electrical safety protection technology, specifically a leakage current cut-off protection tool for a coating machine. Background Technology

[0002] During the operation of a coating machine, equipment safety is a crucial factor in ensuring smooth production. Currently, some leakage current protection devices (RCDs) are being used in coating machines. These devices typically protect the equipment through circuit monitoring and power-off control. However, existing RCDs often rely on complex electronic components and control systems, resulting in high manufacturing costs. Furthermore, their sensitivity may decrease due to changes in environmental conditions during actual use. In addition, these devices usually require professional personnel for installation and maintenance, increasing operating costs and time investment.

[0003] For example, some existing leakage current interruption protection devices typically include components such as a housing, an internal circuit board, and connecting terminals. The circuit board houses a detection module and an execution module for real-time monitoring of current changes and triggering a power-off operation. However, these devices may lack sufficient protection in high-humidity or dusty industrial environments, affecting their performance stability. This indicates that existing technologies still have room for improvement in terms of adaptability and reliability.

[0004] Therefore, we have made improvements to this and proposed a leakage current cut-off protection tool for coating machines. Utility Model Content

[0005] The purpose of this invention is to solve the problems of high manufacturing cost, complex structure, and insufficient adaptability and reliability of existing leakage protection devices for coating machines in industrial environments with high humidity or high dust.

[0006] To achieve the aforementioned objectives and address the aforementioned problems, this utility model provides a leakage current cut-off protection tool for a coating machine, comprising a housing assembly and an internal detection and execution assembly. The housing assembly consists of a main housing and a protective cover. Mounting ears are provided on both sides of the main housing for fixing it near the power line of the coating machine. The protective cover is detachably connected to the main housing by bolts, facilitating maintenance and replacement of the internal components. The internal detection and execution assembly includes a current sensing module, a mechanical trigger module, and a circuit breaker module. The current sensing module is located in the middle of the main housing, the mechanical trigger module is located to one side of the current sensing module, and the circuit breaker module is linked to the mechanical trigger module via a connecting rod.

[0007] The current sensing module includes a conductive ring and a magnetic core assembly. The conductive ring is nested within the central through-hole of the main housing, and the magnetic core assembly surrounds the conductive ring and is connected to the main housing via a fixing bracket. A coil winding is located on the outer side of the magnetic core assembly, with both ends connected to a signal processing circuit board for real-time monitoring of current changes. When the current is abnormal, the magnetic field within the magnetic core assembly changes, triggering the mechanical trigger module.

[0008] The mechanical trigger module includes a lever mechanism and a return spring. The fulcrum of the lever mechanism is fixed to the inner wall of the main housing via a pin. One end of the lever contacts the push rod of the magnetic core assembly, and the other end is hinged to a connecting rod. One end of the return spring is fixed to the bottom of the lever, and the other end is fixed to the inner wall of the main housing, used to restore the initial state after the circuit is broken. When the push rod of the magnetic core assembly pushes the lever, the lever drives the circuit breaking module to operate via the connecting rod.

[0009] The circuit breaker module includes a moving contact and a stationary contact. The moving contact is connected to a connecting rod via an insulating bracket, and the stationary contact is fixed to the inner wall of the main housing. A gap is provided between the moving and stationary contacts. When the connecting rod pushes the moving contact to move, the moving contact separates from the stationary contact, thereby cutting off the power circuit. The surface of the moving contact is plated with a corrosion-resistant metal to improve its service life in high-humidity environments.

[0010] As a preferred technical solution of this application, the inner wall of the main housing is provided with a sealing groove, and a rubber sealing strip is embedded in the sealing groove to enhance the dustproof and waterproof performance of the housing. The edge of the protective cover is provided with a protrusion, which cooperates with the sealing groove to form a double-layer sealing structure, further improving the protective capability.

[0011] As a preferred technical solution of this application, the push rod end of the magnetic core assembly is provided with a buffer pad, which is made of elastic material to reduce the impact force between the push rod and the lever and extend the service life.

[0012] As a preferred technical solution of this application, a ball bearing is provided at the fulcrum of the lever mechanism. The ball bearing is fixed to the shaft pin by a clamping nut to reduce the frictional resistance when the lever swings and improve the sensitivity of the action.

[0013] As a preferred technical solution of this application, an adjusting rod is provided in the middle of the connecting rod. The adjusting rod is connected to the connecting rod by a thread and fixed by a lock nut. The end of the adjusting rod contacts the lever and is used to fine-tune the triggering force of the lever to adapt to different current thresholds.

[0014] As a preferred technical solution of this application, an observation window is provided on the outer side of the main housing. The observation window is made of transparent, high-temperature resistant material and is used to view the working status of the internal components in real time. The observation window is surrounded by slots, and sealing rings are embedded in the slots to prevent external dust and moisture from entering.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this application, a complete leakage current protection system is formed by incorporating a current sensing module, a mechanical triggering module, and a circuit breaker module. The current sensing module uses a magnetic core assembly and coil windings to monitor current changes in real time. When an abnormal current is detected, the push rod of the magnetic core assembly actuates a lever mechanism, which in turn drives the circuit breaker module to cut off the power circuit via a connecting rod. This design eliminates complex electronic components and control systems, reducing manufacturing costs while improving the adaptability and reliability of the device in high-humidity or dusty environments. Furthermore, by optimizing the sealing structure of the housing assembly and the material selection of key components, the protection capability is further enhanced, solving the problem of decreased sensitivity due to changes in environmental conditions in existing technologies. The overall structure is simple and compact, with clear connections between components, facilitating installation and maintenance, and allowing for routine maintenance without the need for professional personnel. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention, showing the assembly relationship between the housing assembly and the internal detection and execution assembly.

[0017] Figure 2 This is a schematic diagram of the current sensing module of this utility model, showing in detail the layout and connection method of the conductive ring, magnetic core assembly and coil winding.

[0018] Figure 3 This is a schematic diagram of the mechanical trigger module of this utility model, which focuses on showing the details of the cooperation between the magnetic core assembly push rod and the lever mechanism.

[0019] Figure 4 This is a schematic diagram of the observation window structure on the outer side of the main housing of this utility model, showing the installation position of the observation window and its sealing ring.

[0020] Figure 5 This is a schematic diagram of the sealing structure between the protective cover and the main housing of this utility model, showing the double-layer sealing design between the protective cover and the main housing.

[0021] The attached figures are labeled as follows: 1. Main housing; 2. Protective cover; 3. Mounting lug; 4. Bolt; 5. Conductive ring; 6. Magnetic core assembly; 7. Coil winding; 8. Lever mechanism; 9. Return spring; 10. Connecting rod; 11. Moving contact; 12. Stationary contact; 13. Rubber sealing strip; 14. Buffer pad; 15. Ball bearing; 16. Adjusting rod; 17. Observation window; 18. Sealing ring. Detailed Implementation

[0022] This utility model provides a leakage current cut-off protection tool for a coating machine, the overall structure of which is as follows: Figure 1 As shown, the system mainly consists of two parts: the housing assembly and the internal detection and execution components. The housing assembly comprises a main housing 1 and a protective cover 2. The main housing 1 has mounting ears 3 on both sides for securing the device near the power supply line of the coating machine. The protective cover 2 is detachably connected to the main housing 1 via bolts 4, facilitating maintenance and replacement of the internal components. The internal detection and execution components include a current sensing module, a mechanical triggering module, and a circuit breaking module. These modules are arranged inside the main housing 1 according to their functional requirements and operate the entire system through mechanical linkage.

[0023] The current sensing module is located in the middle of the main housing 1, and its core components include a conductive ring 5 and a magnetic core assembly 6. The conductive ring 5 is nested in the central through hole of the main housing 1, and the magnetic core assembly 6 is arranged around the conductive ring 5 and connected to the main housing 1 through a fixing bracket. A coil winding 7 is provided on the outer side of the magnetic core assembly 6, and the two ends of the coil winding 7 are respectively connected to a signal processing circuit board for real-time monitoring of current changes. When the current is abnormal, the magnetic field inside the magnetic core assembly 6 changes, causing the push rod to move and triggering subsequent actions. The specific interaction is as follows: Figure 2 As shown, the push rod end of the magnetic core assembly 6 is provided with a buffer pad 14, which is made of elastic material to reduce the impact force between the push rod and the lever mechanism 8 and extend its service life.

[0024] The mechanical trigger module is located on one side of the current sensing module and mainly consists of a lever mechanism 8 and a return spring 9. The fulcrum of the lever mechanism 8 is fixed to the inner wall of the main housing 1 by a pin. A ball bearing 15 is provided at the fulcrum, and the ball bearing 15 is fixed to the pin by a clamping nut to reduce frictional resistance when the lever swings. One end of the lever mechanism 8 is in contact with the push rod of the magnetic core assembly 6, and the other end is linked to the circuit breaking module through a connecting rod 10. One end of the return spring 9 is fixed to the bottom of the lever mechanism 8, and the other end is fixed to the inner wall of the main housing 1, used to restore the initial state after the circuit is broken. Figure 3 The details of the cooperation between the push rod of the magnetic core assembly 6 and the lever mechanism 8 are shown in detail. The adjusting rod 16 is connected to the connecting rod 10 by a thread and is fixed by a lock nut. The end of the adjusting rod 16 contacts the lever mechanism 8 and is used to fine adjust the triggering force of the lever to adapt to different current thresholds.

[0025] The circuit breaker module includes a moving contact 11 and a stationary contact 12. The moving contact 11 is connected to the connecting rod 10 via an insulating bracket, and the stationary contact 12 is fixed to the inner wall of the main housing 1. A gap is provided between the moving contact 11 and the stationary contact 12. When the connecting rod 10 pushes the moving contact 11 to move, the moving contact 11 separates from the stationary contact 12, thereby cutting off the power circuit. The surface of the moving contact 11 is plated with a corrosion-resistant metal to improve its service life in high-humidity environments. Figure 2 The layout and connection method of the circuit breaker module and other modules are clearly shown.

[0026] To enhance the dustproof and waterproof performance of the device, the inner wall of the main housing 1 is provided with a sealing groove, and a rubber sealing strip 13 is embedded in the sealing groove. The edge of the protective cover 2 is provided with a protrusion, which cooperates with the sealing groove to form a double-layer sealing structure, further improving the protection capability. Figure 5 The double-layer sealing design between the protective cover 2 and the main housing 1 is demonstrated. Furthermore, an observation window 17, made of transparent, high-temperature resistant material, is provided on the outer side of the main housing 1 for real-time monitoring of the internal components' operating status. The observation window 17 is surrounded by slots, within which sealing rings 18 are embedded to prevent the ingress of external dust and moisture. Figure 4 The installation position of the observation window 17 and its sealing ring 18 is shown.

[0027] During actual operation, the current sensing module monitors current changes in real time through the conductive ring 5 and the magnetic core assembly 6. When leakage or abnormal current occurs in the power line of the coating machine, the magnetic field inside the magnetic core assembly 6 changes, causing the push rod to move outward. The movement of the push rod pushes one end of the lever mechanism 8, causing the lever mechanism 8 to rotate around the fulcrum. The other end drives the circuit breaker module to operate via the connecting rod 10. The movement of the connecting rod 10 separates the moving contact 11 from the stationary contact 12, thereby cutting off the power circuit and achieving leakage protection. After the circuit is broken, the return spring 9 automatically restores the lever mechanism 8 to its initial state, preparing for the next action. The adjustment rod 16 allows the device to adjust the trigger sensitivity according to actual needs, adapting to different current threshold requirements.

[0028] The double-sealed structure of the main housing 1 and the protective cover 2 effectively prevents the impact of high humidity or dusty environments on internal components, ensuring the stability and reliability of the device in harsh industrial environments. The design of the observation window 17 allows operators to view the working status of internal components in real time without removing the protective cover 2, improving maintenance efficiency. The application of the buffer pad 14 and ball bearing 15 further enhances the durability and responsiveness of the device, reducing wear between components.

[0029] The installation process of the entire device is as follows: First, the conductive ring 5 is nested in the central through hole of the main housing 1, and the magnetic core assembly 6 is connected to the main housing 1 through a fixing bracket. Then, the coil winding 7 is connected to the signal processing circuit board, and the fulcrum of the lever mechanism 8 is fixed to the inner wall of the main housing 1 through a shaft pin. Simultaneously, the ball bearing 15 and the return spring 9 are installed. Next, the connecting rod 10 is hinged to the lever mechanism 8, and the moving contact 11 is connected to the connecting rod 10 through an insulating bracket. The stationary contact 12 is fixed to the inner wall of the main housing 1. Finally, the rubber sealing strip 13 and the protective cover 2 are installed to ensure the integrity of the double-layer sealing structure. The component connections of the entire device are clearly defined, the structure is compact, and it is easy to install and maintain.

[0030] Through the above specific embodiments, this utility model achieves leakage protection for the power supply circuit of the coating machine, solving the problems of high manufacturing cost, complex structure, and insufficient adaptability in the prior art. The design of the device fully considers the needs of industrial environments with high humidity or high dust, ensuring its reliability and stability in practical applications.

[0031] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the operating principle and implementation steps of this utility model is provided in conjunction with specific application scenarios.

[0032] During the actual operation of the coating machine, the device is first fixed to a suitable position near the power line of the coating machine via the mounting ears 3 on both sides of the main housing 1. After installation, the conductive ring 5 is connected in series with the power line of the coating machine, allowing current to flow through the conductive ring 5. At this time, the magnetic core assembly 6 is arranged around the conductive ring 5, and the current change is monitored in real time through the coil winding 7. When the coating machine is running normally, the current flows stably, the magnetic field in the magnetic core assembly 6 remains constant, the push rod is in the initial position, the lever mechanism 8 and the circuit breaker module do not move, and the power circuit remains closed.

[0033] When leakage or abnormal current occurs in the power supply line of the coating machine, such as due to decreased insulation performance caused by equipment aging or current fluctuations caused by external environmental factors, the current in the conductive ring 5 will change. This change will cause a change in the magnetic field within the magnetic core assembly 6, and the change in the magnetic field will cause the push rod of the magnetic core assembly 6 to move outward. Figure 2 As shown, the buffer pad 14 at the end of the push rod contacts one end of the lever mechanism 8. The elastic material of the buffer pad 14 effectively absorbs the impact force generated when the push rod moves, thereby reducing the wear of parts and extending the service life of the device.

[0034] The movement of the push rod drives the lever mechanism 8 to rotate around the fulcrum. The ball bearing 15 at the fulcrum significantly reduces the frictional resistance during lever oscillation, ensuring sensitive and reliable operation. The other end of the lever mechanism 8 is linked to the circuit breaker module via a connecting rod 10. When the lever mechanism 8 rotates, the connecting rod 10 moves accordingly, causing the moving contact 11 to move towards the stationary contact 12. Figure 2 As shown, there is originally a gap between the moving contact 11 and the stationary contact 12. When the connecting rod 10 pushes the moving contact 11 to move, the moving contact 11 separates from the stationary contact 12, cutting off the power circuit and thus realizing the leakage protection function. The surface of the moving contact 11 is plated with a corrosion-resistant metal layer, which can maintain good conductivity and mechanical properties even in high humidity environments, further improving the reliability of the device.

[0035] After the circuit breaking action is completed, the return spring 9 automatically restores the lever mechanism 8 to its initial state, preparing it for the next action. Meanwhile, the design of the adjusting rod 16 allows the operator to fine-tune the lever's trigger force according to actual needs. Specifically, by rotating the adjusting rod 16 to adjust the distance between its end and the lever mechanism 8, different current thresholds can be accommodated, thus meeting the usage requirements under different operating conditions. Figure 3 As shown, the adjusting rod 16 is connected to the connecting rod 10 by a thread and is fixed by a lock nut to ensure stability after adjustment.

[0036] Furthermore, the double-layer sealing structure between the main housing 1 and the protective cover 2 plays a crucial role in industrial environments with high humidity or high dust levels. For example... Figure 5 As shown, a rubber sealing strip 13 is embedded in the sealing groove on the inner wall of the main housing 1. The protrusions on the edge of the protective cover 2 cooperate with the sealing groove to form a double seal, effectively preventing external dust and moisture from entering the internal components. This design not only enhances the protective capability of the device but also ensures its stability and reliability in harsh environments. The application of the observation window 17 further improves maintenance efficiency, allowing operators to view the working status of the internal components in real time through the observation window 17, made of transparent high-temperature resistant material, without disassembling the protective cover 2. Figure 4 As shown, the observation window 17 is fitted with a sealing ring 18 in the groove around it to prevent external dust and moisture from seeping in and to ensure the sealing performance of the observation window.

[0037] In summary, this utility model achieves leakage protection for the power supply circuit of the coating machine through the specific implementation steps described above. From the real-time monitoring of the current sensing module to the action transmission of the mechanical triggering module, and then to the rapid response of the circuit breaking module, the entire process is closely integrated, ensuring the adaptability and reliability of the device in high humidity or dusty environments. Furthermore, by optimizing the material selection and structural design of key components, the durability and ease of maintenance of the device are further enhanced, fully meeting the needs of practical applications.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A leakage current cut-off protection tool for a coating machine, characterized in that, The device includes a housing assembly and an internal detection and execution assembly. The housing assembly includes a main housing (1) and a protective cover (2). The main housing (1) has mounting ears (3) on both sides. The protective cover (2) is detachably connected to the main housing (1) by bolts (4). The internal detection and execution assembly includes a current sensing module, a mechanical triggering module and a circuit breaking module. The current sensing module is located in the middle of the main housing (1), the mechanical triggering module is located on one side of the current sensing module, and the circuit breaking module is linked to the mechanical triggering module through a connecting rod (10).

2. The leakage current cut-off protection tool for a coating machine according to claim 1, characterized in that, The current sensing module includes a conductive ring (5) and a magnetic core assembly (6). The conductive ring (5) is nested in the central through hole of the main housing (1). The magnetic core assembly (6) is arranged around the conductive ring (5) and connected to the main housing (1) through a fixed bracket. A coil winding (7) is provided on the outside of the magnetic core assembly (6). The two ends of the coil winding (7) are respectively connected to the signal processing circuit board.

3. The leakage current cut-off protection tool for a coating machine according to claim 2, characterized in that, The mechanical triggering module includes a lever mechanism (8) and a return spring (9). The fulcrum of the lever mechanism (8) is fixed to the inner wall of the main housing (1) by a shaft pin. One end of the lever mechanism (8) is in contact with the push rod of the magnetic core assembly (6), and the other end is hinged to the connecting rod (10). One end of the return spring (9) is fixed to the bottom of the lever mechanism (8), and the other end is fixed to the inner wall of the main housing (1).

4. The leakage current cut-off protection tool for a coating machine according to claim 3, characterized in that, The circuit breaker module includes a moving contact (11) and a stationary contact (12). The moving contact (11) is connected to the connecting rod (10) through an insulating bracket. The stationary contact (12) is fixed on the inner wall of the main housing (1). There is a gap between the moving contact (11) and the stationary contact (12).

5. A leakage current cut-off protection tool for a coating machine according to claim 4, characterized in that, The inner wall of the main housing (1) is provided with a sealing groove, and a rubber sealing strip (13) is embedded in the sealing groove. The edge of the protective cover (2) is provided with a protrusion, and the protrusion and the sealing groove cooperate to form a double-layer sealing structure.

6. A leakage current cut-off protection tool for a coating machine according to claim 3, characterized in that, The push rod end of the magnetic core assembly (6) is provided with a buffer pad (14), which is made of elastic material.

7. A leakage current cut-off protection tool for a coating machine according to claim 3, characterized in that, The lever mechanism (8) is provided with a ball bearing (15) at the fulcrum, and the ball bearing (15) is fixed to the shaft pin by a clamping nut.

8. A leakage current cut-off protection tool for a coating machine according to claim 3, characterized in that, The connecting rod (10) is provided with an adjusting rod (16) in the middle. The adjusting rod (16) is connected to the connecting rod (10) by a thread and fixed by a locking nut. The end of the adjusting rod (16) is in contact with the lever mechanism (8).

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