A device for removing deposits from the surface of cold rolling mill rolls

Abstract

This application relates to the technical field of machining, specifically a device for removing deposits from the surface of cold rolling mill rolls, comprising: a mounting plate, a support plate, a movable plate, a connecting seat A, a rotating shaft A, a grinding roller A, a grinding motor A, a belt A, an adjustment module, a support box, a limiting groove, a support base, a connecting shaft, a connecting arm, a rotating shaft B, a grinding roller B, a grinding motor B, a belt B, and an electric push rod. The support plate is fixedly connected to the surface of the rear left side of the mounting plate. One end of the movable plate is movably connected to the upper end of the support plate. The adjustment module is connected to the lower part of the movable plate. Two connecting seats A are provided, symmetrically fixedly connected to the upper surface of the movable end of the movable plate. One end of each rotating shaft A is rotatably connected to the connecting seat A. This application has the effects of reducing the difficulty of cleaning deposits, improving cleaning efficiency and effect, and reducing manual labor intensity.

Description

Technical Field

[0001] This application relates to the technical field of machining, and in particular to a device for removing deposits from the surface of cold rolling mill rolls. Background Technology

[0002] A cold rolling mill is a mechanical device used to roll steel. During production, it generates metal dust and debris. After a period of use, this metal dust adheres to the outer surface of the rolls, affecting the normal rolling of the steel. This can result in rough surfaces or cracks, and even lead to the breakage of raw materials, shortening the lifespan of the rolls. To ensure the normal use of the rolls, physical methods are often used to clean their surfaces after a period of use. Existing cleaning methods often involve using grinding belts to polish the roll surfaces. However, the roughness of the polishing is difficult to control during the process, and the roll diameters vary, making it difficult to polish completely. This requires workers to have a high level of skill to achieve good polishing results, which increases production costs. Therefore, it is necessary to improve the existing equipment for removing surface deposits from cold rolling mill rolls to improve the cleaning effect and reduce the difficulty of cleaning. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this application is to provide a device for removing adhering substances from the surface of cold rolling mill rolls, which reduces the difficulty of cleaning adhering substances, improves the cleaning efficiency, and reduces manual labor.

[0004] The above-mentioned objective of this application is achieved through the following technical solution:

[0005] A device for removing deposits from the surface of cold rolling mill rolls includes: a mounting plate, a support plate, a movable plate, a connecting seat A, a rotating shaft A, a grinding roller A, a grinding motor A, a belt A, an adjustment module, a support box, a limiting groove, a support base, a connecting shaft, a connecting arm, a rotating shaft B, a grinding roller B, a grinding motor B, a belt B, and an electric push rod. The support plate is fixedly connected to the surface of the rear left side of the mounting plate. One end of the movable plate is movably connected to the upper end of the support plate. The adjustment module is connected to the lower part of the movable plate. Two connecting seats A are provided, symmetrically fixedly connected to the upper surface of the movable end of the movable plate. One end of each rotating shaft A is rotatably connected to a connecting seat A. The grinding roller A is fitted to the end of the rotating shaft A. The grinding motor A is fixedly connected to the surface of the movable plate near the connecting end. The end of the grinding motor A is driven by the middle part of the rotating shaft A via the belt A. The support box has an inverted U-shape and is fixedly connected to the surface of the middle part of the mounting plate. A through groove is formed in the middle of the box, and the grinding roller A corresponds to the through groove. The limiting groove is arc-shaped and is formed in the middle on the surface of the support box near the movable plate. The center of the limiting groove is located at the movable connection between the support plate and the movable plate. The support base is fixedly connected to the surface of the mounting plate on the right side of the support box. The connecting shaft is rotatably connected to the upper end of the support base. The middle part of the connecting arm is movably connected to the connecting shaft. The two sides of the connecting arm are bent upwards at the connection position. The rotating shaft B is rotatably connected to the end of the connecting arm near the support box. The grinding roller B is fixedly connected to one end of the rotating shaft B. The grinding motor B is fixedly connected to the upper surface of the connecting arm. The output end of the grinding motor B is connected to the other end of the rotating shaft B through the belt B. The lower end of the electric push rod is movably connected to the right side of the mounting plate. The upper end of the electric push rod is movably connected to the other end of the connecting arm. The roller body is placed on the upper surface of the support box. The grinding roller A and the grinding roller B are in contact with the outer surface of the roller body.

[0006] Optionally, the adjustment module includes a connector, a slide rail, a connecting block, a lead screw, a sliding block, and a connecting rod. The connector is fixedly connected to the lower surface of the movable plate. The slide rail is fixedly connected to the upper surface of the mounting plate corresponding to the middle position of the movable plate. The connecting blocks are respectively fixedly connected to the upper surfaces of the mounting plates at both ends of the slide rail. The two ends of the lead screw are rotatably connected to the connecting blocks. The sliding block is slidably connected inside the slide rail, and the middle part of the sliding block is threadedly connected to the lead screw. One end of the connecting rod is movably connected to the connector, and the other end of the connecting rod is movably connected to the upper end of the sliding block.

[0007] Optionally, it also includes a connecting seat B and a support roller. The connecting seat B is connected to the front and rear surfaces of the support box, and the two ends of the support roller are rotatably connected to the connecting seat B. The roll body is placed on the upper end of the support roller.

[0008] Optionally, it also includes an adjusting motor, a belt C, and adjusting holes. The adjusting motor is fixedly connected to the upper surface of the mounting plate inside the lower end of the support box. The output end of the adjusting motor is connected to the end of one of the support rollers via the belt C. The adjusting holes are equidistantly opened on the surface of the support box corresponding to the end of the other support roller, and the connecting seat B on this side is connected to the adjusting holes.

[0009] Optionally, it also includes support blocks, which are symmetrically fixedly connected to the mounting plate surfaces on both sides of the front end of the slide rail, and the upper ends of the support blocks are respectively connected to the ends of the movable plates.

[0010] Optionally, it also includes a connecting platform, which is fixedly connected to the right end of the mounting plate, and the upper end of the connecting platform is movably connected to the lower end of the electric push rod.

[0011] Optionally, it also includes mounting holes, which are arranged in a ring array and are formed through the surface of the mounting plate near the edge.

[0012] Optionally, it also includes helical protrusions, which are fixedly connected to the surface of the support roller.

[0013] Optionally, the system also includes mounting blocks, which are fixedly connected to the upper surfaces of both sides of the support box. Each mounting block has connection holes.

[0014] Optionally, it also includes a microcontroller, which is fixedly connected to the surface of one side of the mounting plate. The input terminal of the microcontroller is electrically connected to the output terminal of an external power supply, and the output terminal of the microcontroller is electrically connected to the input terminal of an electrical appliance.

[0015] This cold rolling mill roll surface attachment removal device adopts a combined structure, which can simultaneously grind the radial and axial sides of the rolls, and the two can work together to achieve a full-coverage grinding effect. This reduces the need for operator experience in the traditional cleaning process and effectively reduces the labor intensity of workers.

[0016] This cold rolling mill roll surface attachment removal device is convenient to adjust the pressure between the grinding and cleaning structure and the roll. It can be flexibly adjusted according to the actual roll surface and the degree of adhering impurities. It is easy to operate and has good application prospects.

[0017] This cold rolling mill roll surface attachment removal device has good structural stability during use, is not prone to failure, has low maintenance costs, can be used with rolls of different diameters, has a wide range of applications, can automatically remove surface impurities, restore the surface smoothness of the rolls, and is more easily accepted by people. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram of the bottom structure of the adjustment module provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the rear structure provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the support box structure provided in the embodiment of this application.

[0022] Reference numerals: 1. Mounting plate; 2. Support plate; 3. Movable plate; 4. Connecting seat A; 5. Rotating shaft A; 6. Grinding roller A; 7. Grinding motor A; 8. Belt A; 9. Adjustment module; 91. Connecting head; 92. Slide rail; 93. Connecting block; 94. Lead screw; 95. Sliding block; 96. Connecting rod; 10. Support box; 11. Limiting groove; 12. Support seat; 13. Connecting shaft; 14. Connecting arm; 15. Rotating shaft B; 16. Grinding roller B; 17. Grinding motor B; 18. Belt B; 19. Electric push rod; 20. Connecting seat B; 21. Support roller; 22. Adjusting motor; 23. Belt C; 24. Adjusting hole; 25. Connecting platform; 26. Mounting hole; 27. Spiral protrusion; 28. Mounting block; 29. ​​Microcontroller; 30. Support block; 31. Roller body. Detailed Implementation

[0023] The present application will be further described in detail below with reference to the accompanying drawings.

[0024] To better understand the technical solutions presented in the embodiments of this application, the work of removing attachments from the surface of existing cold rolling mill rolls will first be introduced.

[0025] Existing surface cleaning devices for cold rolling mills mostly employ belt-type grinding structures, which allow the grinding belt to contact the cold rolling rolls and thus grind their surfaces. However, since belts cannot drive larger and heavier rolls to rotate, manual angle adjustment is required during grinding to clean the roll surface. These operations require a high level of manual experience, and adjustments are not convenient when changing rolls of different diameters. Furthermore, the grinding belt can only clean the radial direction of the roll, and its cleaning effect is poor for radially oriented deposits. Therefore, it is crucial to improve the existing grinding methods and provide a deposit removal device that can perform comprehensive grinding and is easy to adjust.

[0026] Please see Figure 1 , Figure 2 and Figure 4This application discloses a device for removing surface deposits from cold rolling mill rolls, comprising: a mounting plate 1, a support plate 2, a movable plate 3, a connecting seat A4, a rotating shaft A5, a grinding roller A6, a grinding motor A7, a belt A8, an adjustment module 9, a support box 10, a limiting groove 11, a support seat 12, a connecting shaft 13, a connecting arm 14, a rotating shaft B15, a grinding roller B16, a grinding motor B17, a belt B18, and an electric push rod 19. The support plate 2 is fixedly connected to the surface of the rear left side of the mounting plate 1, and one end of the movable plate 3 is movably connected to the upper end of the support plate 2. Next, adjustment module 9 is connected to the lower part of movable plate 3. Two connecting seats A4 are provided, and the connecting seats A4 are symmetrically fixedly connected to the upper surface of the movable end of movable plate 3. One end of rotating shaft A5 is rotatably connected to connecting seat A4. Grinding roller A6 is connected to the end of rotating shaft A5. Grinding motor A7 is fixedly connected to the surface of movable plate 3 near the connecting end. The end of grinding motor A7 is connected to the middle of rotating shaft A5 through belt A8. Support box 10 has an inverted U-shape and is fixedly connected to the surface of the middle part of mounting plate 1. A through groove is formed in the middle of the support box 10, and the grinding roller A6 corresponds to this through groove. The limiting groove 11 is arc-shaped and is formed in the middle of the support box 10 near the movable plate 3. The center of the limiting groove 11 is located at the movable connection between the support plate 2 and the movable plate 3. The support base 12 is fixedly connected to the surface of the mounting plate 1 on the right side of the support box 10. The connecting shaft 13 is rotatably connected to the upper end of the support base 12. The middle part of the connecting arm 14 is movably connected to the connecting shaft 13. The two sides of the connecting arm 14 are bent upwards at the connection position. The rotating shaft B15 is rotatably connected to the... The end of the connecting arm 14 near the support box 10 has a grinding roller B16 fixedly connected to one end of the rotating shaft B15. The grinding motor B17 is fixedly connected to the upper surface of the connecting arm 14. The output end of the grinding motor B17 is connected to the other end of the rotating shaft B15 via a belt B18. The lower end of the electric push rod 19 is movably connected to the right side of the mounting plate 1. The upper end of the electric push rod 19 is movably connected to the other end of the connecting arm 14. The roller body 31 is placed on the upper surface of the support box 10. The grinding roller A6 and the grinding roller B16 are in contact with the outer surface of the roller body 31, respectively.

[0027] Specifically, mounting plate 1 provides a support carrier for installation and connection, facilitating relocation within the workshop and reducing the time spent repositioning the equipment after movement, thus improving production efficiency. The support plate 2 and movable plate 3 are connected movably, leaving space at the bottom for installing adjustment module 9. Adjustment module 9 allows for free adjustment of the position of movable plate 3, offering good operational convenience and maintaining operational stability during high-speed cleaning. Connecting seat A4 provides stable support for rotating shaft A5, ensuring stable rotation during cleaning and reducing fluctuations. Grinding roller A6 is composed of several grinding discs of the same diameter connected together, allowing for adjustments to the grinding area. Grinding motor A7 stably drives rotating shaft A5 at a certain speed via belt A8, achieving different grinding effects. Support box 10 supports roller body 31, allowing the bottom of roller body 31 to contact grinding roller A6 for radial grinding. Complete grinding is achieved during axial rotation and movement of roller body 31. The limiting groove 11 is used to restrict the trajectory of the rotating shaft A5 during the lifting process, thereby improving its stability during movement. In actual use, a bearing structure and lubricating oil can be added at the connection position to further reduce the frictional contact between the two and extend the service life, enabling grinding operations under different pressures. The support seat 12 is used to support the connecting shaft 13 to a higher position, so that the connecting arm 14 can be located at a higher height, which is convenient for adapting to the larger diameter roller body 31. The rotating shaft B15 is installed at the end of the connecting arm 14. The wider connection area makes the rotating shaft B15 more stable during rotation. The grinding motor B17 can provide pressure to the grinding roller B16, further improving the stability during the grinding process. During operation, the electric push rod 19 extends, thereby pressing down the grinding roller B16 at the end of the rotating shaft B15, thereby achieving radial cleaning of the roller body 31. The two cleaning directions are perpendicular to each other, which can greatly improve the cleaning effect in real-time operation. Compared with the cleaning methods of traditional sanding belts or handheld grinding equipment, it is more efficient.

[0028] Please see Figure 2 As another specific embodiment provided in the application, the adjustment module 9 includes a connector 91, a slide rail 92, a connecting block 93, a lead screw 94, a sliding block 95, and a connecting rod 96. The connector 91 is fixedly connected to the lower surface of the movable plate 3. The slide rail 92 is fixedly connected to the upper surface of the mounting plate 1 corresponding to the middle position of the movable plate 3. The connecting blocks 93 are respectively fixedly connected to the upper surfaces of the mounting plates 1 at both ends of the slide rail 92. The two ends of the lead screw 94 are rotatably connected to the connecting blocks 93. The sliding block 95 is slidably connected inside the slide rail 92. The middle part of the sliding block 95 is threadedly connected to the lead screw 94. One end of the connecting rod 96 is movably connected to the connector 91, and the other end of the connecting rod 96 is movably connected to the upper end of the sliding block 95.

[0029] Specifically, during operation, the handle at the end of the lead screw 94 is rotated, causing the sliding block 95 to move along the slide rail 92, which in turn drives the lower end of the connecting rod 96 to move accordingly. This causes the upper connector 91 to drive the movable plate 3 to rotate along the connection position with the support plate 2, causing its height to rise or fall. This causes the grinding roller A6 to exert different pressures on the lower end of the roller body 31, or to drive the roller body 31 to rotate, thus achieving complete cleaning at that location. The cleaning process can be achieved without the addition of external equipment.

[0030] Please see Figure 3 As another specific embodiment provided in the application, it also includes a connecting seat B20 and a support roller 21. The connecting seat B20 is connected to the front and rear surfaces of the support box 10, and the two ends of the support roller 21 are rotatably connected to the connecting seat B20. The roller body 31 is placed on the upper end of the support roller 21.

[0031] Furthermore, it also includes spiral protrusions 27, which are fixedly connected to the surface of the support roller 21.

[0032] Specifically, the connecting seat B20 can connect to the support roller 21, thereby supporting the roll body 31 through the support roller 21. This structure can improve the ease of rotation of the roll body 31, enabling rotation with a small amount of drive. The spiral protrusion 27 can make the roll body 31 move to one end when rotating, thereby adjusting the position and improving the automation of the grinding process.

[0033] Please see Figure 2 As another specific embodiment provided in the application, it also includes an adjusting motor 22, a belt C23 and an adjusting hole 24. The adjusting motor 22 is fixedly connected to the upper surface of the mounting plate 1 inside the lower end of the support box 10. The output end of the adjusting motor 22 is connected to the end of one of the support rollers 21 through the belt C23. The adjusting hole 24 is equidistantly opened on the surface of the support box 10 corresponding to the end of the other support roller 21, and the connecting seat B20 on this side is connected to the adjusting hole 24.

[0034] Specifically, the adjusting motor 22 can drive the support roller 21 to rotate at a certain angle through the belt C23, thereby realizing the simultaneous grinding and position movement. The setting of the adjusting hole 24 can adjust the position of the other support roller 21 to adapt to the roller body 31 of different diameters, improve the adaptability range, and help improve the convenience in actual operation.

[0035] Please see Figure 2As another specific embodiment provided in the application, it also includes a support block 30, which is symmetrically fixedly connected to the mounting plate 1 on both sides of the front end of the slide rail 92, and the upper end of the support block 30 is respectively connected to the end of the movable plate 3.

[0036] Specifically, the support block 30 can support the end of the movable plate 3, thereby dispersing the pressure when the movable plate 3 is lowered, avoiding squeezing the components on the adjustment module 9, which meets the needs of actual scenarios.

[0037] Please see Figure 3 As another specific embodiment provided in the application, it also includes a connecting platform 25, which is fixedly connected to the right end of the mounting plate 1, and the upper end of the connecting platform 25 is movably connected to the lower end of the electric push rod 19.

[0038] Specifically, the connection platform 25 can raise the connection position of the electric actuator 19, which helps to select a smaller electric actuator 19 and reduce costs.

[0039] Furthermore, it also includes mounting holes 26, which are arranged in a ring array on the surface of the mounting plate 1 near the edge.

[0040] Specifically, the mounting hole 26 facilitates the connection of the mounting plate 1 to the ground or a platform in the production area.

[0041] Furthermore, it also includes mounting blocks 28, which are fixedly connected to the upper surfaces of both sides of the support box 10. The mounting blocks 28 are provided with connection holes.

[0042] Specifically, the mounting block 28 can be used to connect different devices or components, reducing damage caused by drilling and welding on the original structure during subsequent equipment modifications, and helping to improve overall strength.

[0043] Furthermore, it also includes a microcontroller 29, which is fixedly connected to the surface of one side of the mounting plate 1. The input terminal of the microcontroller 29 is electrically connected to the output terminal of an external power supply, and the output terminal of the microcontroller 29 is electrically connected to the input terminal of an electrical appliance.

[0044] Specifically, the microcontroller 29 can control the rotation speeds of the grinding motors A7 and B17 and adjust the speed of the motor 22 to achieve different grinding speeds, thereby achieving different frictional impurity removal effects, greatly reducing manual labor and improving production efficiency.

[0045] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for removing deposits from the surface of cold rolling mill rolls, characterized in that, Include: Mounting plate (1), support plate (2), movable plate (3), connecting seat A (4), rotating shaft A (5), polishing roller A (6), polishing motor A (7), belt A (8), adjustment module (9), support box (10), limiting groove (11), support seat (12), connecting shaft (13), connecting arm (14), rotating shaft B (15), polishing roller B (16), polishing motor B (17), belt B (18) and electric push rod (19), the support plate (2) is fixedly connected on the surface of the left end rear side of the mounting plate (1), one end of the movable plate (3) is movably connected with the upper end of the support plate (2), the adjustment module (9) is connected to the lower part of the movable plate (3), the connecting seat A (4) is provided with two, the connecting seat A (4) is symmetrically fixedly connected to the upper surface of the movable end of the movable plate (3), one end of the rotating shaft A (5) is rotatably connected with the connecting seat A (4) respectively, the polishing roller A (6) is connected with the end of the rotating shaft A (5), the polishing motor A (7) is fixedly connected on the surface of the side close to the connecting end of the movable plate (3), the end of the polishing motor A (7) is drivingly connected with the middle part of the rotating shaft A (5) through the belt A (8), the support box (10) is inverted U-shaped in appearance, the support box (10) is fixedly connected on the surface of the middle part of the mounting plate (1), the middle part of the support box (10) is provided with a through groove, the polishing roller A (6) corresponds to the through groove, the limiting groove (11) is circular arc-shaped, the limiting groove (11) is provided on the surface of the side close to the movable plate (3) of the support box (10), the center of the limiting groove (11) is located at the movable connection between the support plate (2) and the movable plate (3), the support seat (12) is fixedly connected on the surface of the mounting plate (1) on the right side of the support box (10), the connecting shaft (13) is rotatably connected on the upper end of the support seat (12), the middle part of the connecting arm (14) is movably connected with the connecting shaft (13), the connecting arm (14) is bent upward on both sides of the connecting position, the rotating shaft B (15) is rotatably connected on the end of the side close to the support box (10) of the connecting arm (14), the polishing roller B (16) is fixedly connected on one end of the rotating shaft B (15), the polishing motor B (17) is fixedly connected on the upper surface of the connecting arm (14), the output end of the polishing motor B (17) is drivingly connected with the other end of the rotating shaft B (15) through the belt B (18), the lower end of the electric push rod (19) is movably connected on the right side of the mounting plate (1), the upper end of the electric push rod (19) is movably connected with the other end of the connecting arm (14), the upper surface of the support box (10) is placed with a roller body (31), the polishing roller A (6) and the polishing roller B (16) are respectively in contact with the outer surface of the roller body (31), so that the roller body (31) is simultaneously polished in the radial direction and the axial direction. It also includes connecting seat B (20) and support roller (21), connecting seat B (20) is respectively connected on the surface of the support box (10) front and rear two ends, the both ends of the support roller (21) are rotatably connected with connecting seat B (20), the upper end of the support roller (21) places the roller body (31); It also includes adjusting motor (22), belt C (23) and adjusting hole (24), the adjusting motor (22) is fixedly connected on the upper surface of the mounting plate (1) in the lower end of the support box (10), the output end of the adjusting motor (22) is drivingly connected with the end of one of the support rollers (21) through the belt C (23), the adjusting holes (24) are equidistantly arranged on the surface of the support box (10) corresponding to the end of the other support roller (21), and the connecting seat B (20) is connected with the adjusting hole (24). It also includes spiral protrusions (27), the spiral protrusions (27) are respectively fixedly connected on the surface of the support roller (21).

2. A cold mill roll surface deposit removal device according to claim 1, characterized in that: The adjusting module (9) comprises a connecting head (91), a sliding rail (92), a connecting block (93), a lead screw (94), a sliding block (95) and a connecting rod (96), the connecting head (91) is fixedly connected to the lower surface of the movable plate (3), the sliding rail (92) is fixedly connected to the upper surface of the mounting plate (1) at the middle position of the movable plate (3), the connecting block (93) is fixedly connected to the upper surface of the mounting plate (1) at both ends of the sliding rail (92), the both ends of the lead screw (94) are rotatably connected together with the connecting block (93), the sliding block (95) is slidingly connected in the sliding rail (92), the middle part of the sliding block (95) is threadedly connected together with the lead screw (94), one end of the connecting rod (96) is movably connected with the connecting head (91), and the other end of the connecting rod (96) is movably connected with the upper end of the sliding block (95).

3. A cold mill roll surface deposit removal device according to claim 1, characterized in that: It also includes support blocks (30), the support blocks (30) are symmetrically fixedly connected to the surfaces of the mounting plates (1) on both sides of the front end of the sliding rail (92), and the upper ends of the support blocks (30) are movably connected with the ends of the movable plate (3).

4. A cold mill roll surface deposit removal device according to claim 1, characterized in that: It also includes a connecting table (25), the connecting table (25) is fixedly connected to the right end of the mounting plate (1), and the upper end of the connecting table (25) is movably connected with the lower end of the electric push rod (19).

5. A cold mill roll surface deposit removal device according to claim 1, characterized in that: It also includes mounting holes (26), the mounting holes (26) are annularly arranged and penetratingly formed on the surface of the mounting plate (1) near the edge position.

6. A cold mill roll surface deposit removal device according to claim 1, characterized in that: It also includes mounting blocks (28), the mounting blocks (28) are respectively fixedly connected to the upper end surfaces of the both sides of the support box (10), and the mounting blocks (28) are provided with connecting holes.

7. A cold mill roll surface deposit removal device according to claim 1, wherein: It also includes a single-chip microcomputer (29), the single-chip microcomputer (29) is fixedly connected to the surface of one side of the mounting plate (1), the input end of the single-chip microcomputer (29) is electrically connected with the output end of an external power supply, and the output end of the single-chip microcomputer (29) is electrically connected with the input end of an electric appliance.

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