Elevator guide rail calibration and adjustment assembly

Abstract

The utility model relates to the technical field of elevators, in particular to an elevator guide rail calibration and adjustment assembly which comprises a first positioning assembly and a second positioning assembly, the first positioning assembly and the second positioning assembly are detachably connected into an elevator guide rail, the first positioning assembly comprises a first rectangular box body, and an infrared emission assembly is arranged at the bottom of the front side of the first rectangular box body. The second positioning assembly comprises a second rectangular box body, and a detection assembly is arranged at the top of the front side of the second rectangular box body. According to the elevator guide rail calibration and adjustment assembly, the first positioning assembly and the second positioning assembly can conduct large-range distance adjustment according to needs, so that the assembly can adapt to the height and width of an elevator shaft, meanwhile, due to the fact that the assembly is compact in structure and convenient and fast to operate, the assembly is particularly suitable for conducting calibration operation on the guide rail in a narrow space, and the cost is reduced. The problem that in the prior art, operation is difficult in a narrow environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to an elevator guide rail calibration and adjustment assembly. Background Technique

[0002] Elevator guide rails are key components to ensure the safe and stable operation of elevator cars, playing a role in supporting and guiding the vertical movement of the cars. The straightness and perpendicularity of the guide rails directly affect the operation quality and safety of the elevator. During long-term operation, due to the settlement of the building structure, the thermal expansion and contraction of the guide rails, and other external factors, the guide rails may undergo slight displacement, deformation, or deviation. If this situation is not corrected in time, it will cause the elevator to vibrate and the friction to increase during operation, and even pose safety hazards. Therefore, regularly calibrating and adjusting the elevator guide rails precisely is a necessary step to ensure the safe operation of the elevator.

[0003] The patent with the publication number CN218320170U discloses a calibrator for installing elevator guide rails, including a guide rail body and a telescopic rod. A telescopic rod is arranged inside the guide rail body. An installation plate is arranged at the top of the telescopic rod, and the installation plate is fixedly connected to the telescopic rod. An infrared emitter is arranged at the bottom of the installation plate, and the infrared emitter and the installation plate are fixed by screws. A light sensor is arranged at the bottom of the installation plate. A reflector is arranged on one side of the bottom of the telescopic rod, an upper electromagnet is arranged at the top of one side of the telescopic rod, and a lower electromagnet is arranged on one side of the bottom of the telescopic rod. By providing the telescopic rod, the infrared emitter, the reflector, and the two electromagnets, the calibration of the guide rail is realized, without considering the problem of the plumb bob shaking and the dim light, effectively improving the accuracy of the detection result.

[0004] Due to the physical limitation of the telescopic rod in the above-mentioned prior art, the distance between the infrared emitter and the reflector can only be adjusted within a limited height range, which results in a limited range of use and is difficult to meet the detection requirements of guide rails with a relatively large height. In addition, the overall structure of this device is relatively bulky, which is not conducive to operation and use especially in the narrow environment of the elevator shaft. In view of this, we propose an elevator guide rail calibration and adjustment assembly. Content of the Utility Model

[0005] The purpose of the utility model is to provide an elevator guide rail calibration and adjustment assembly to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] Elevator guide rail calibration and adjustment assembly, including a first positioning assembly and a second positioning assembly. Both the first positioning assembly and the second positioning assembly are detachably connected inside the elevator guide rail. During use, the first positioning assembly is located above the second positioning assembly. The first positioning assembly is fixed inside the upper elevator guide rail, and the second positioning assembly is fixed inside the lower elevator guide rail. Moreover, the distance between the first positioning assembly and the second positioning assembly can be adjusted within a large range as needed, and it is also suitable for operation in a narrow elevator shaft environment;

[0008] The first positioning assembly includes a first rectangular box body. The rear side of the first rectangular box body is in contact with the rear side of the inner wall of the elevator guide rail. On both the left and right sides of the first rectangular box body, there are first rectangular abutting rods that can be adjusted left and right. The opposite sides of the two first rectangular abutting rods are respectively in contact with the left and right sides of the inner wall of the elevator guide rail, and can center and fix the first rectangular box body. At the bottom of the front side of the first rectangular box body, there is an infrared emission component. The infrared emission component includes a first mounting plate fixedly connected to the front side of the first rectangular box body. In the middle of the bottom of the first mounting plate, there is an infrared emitter. The infrared emitter is used to emit an infrared beam, which irradiates onto the detection component to detect the position deviation of the guide rail, thereby providing a reference for calibration;

[0009] The second positioning assembly includes a second rectangular box body. The rear side of the second rectangular box body is in contact with the rear side of the inner wall of the elevator guide rail. On both the left and right sides of the second rectangular box body, there are second rectangular abutting rods that can be adjusted left and right. The opposite sides of the two second rectangular abutting rods are respectively in contact with the left and right sides of the inner wall of the elevator guide rail, and can center and fix the second rectangular box body. At the top of the front side of the second rectangular box body, there is a detection component. The detection component includes a second mounting plate fixedly connected to the front side of the second rectangular box body. In the middle of the top of the second mounting plate, there is a light sensor. The detection component is responsible for receiving the infrared light signal and detecting the infrared light signal through the light sensor. When the light sensor cannot receive the infrared light, it means that the upper and lower adjacent elevator guide rails are misaligned, and the position of the elevator guide rail needs to be adjusted. When the light sensor receives the infrared light, it means that the upper and lower adjacent elevator guide rails are in a standard docking state.

[0010] Preferably, a first worm gear is rotatably connected at a position near the bottom inside the first rectangular box body. At both the left and right ends of the rotating shaft of the first worm gear, there are first lead screws coaxially connected. The two first rectangular abutting rods are respectively threadedly connected to the outside of the two first lead screws. The first rectangular abutting rods are slidably connected to the first rectangular box body. By driving the two first lead screws to rotate through the first worm gear, the two first lead screws respectively drive the two first rectangular abutting rods to move. The two first rectangular abutting rods move synchronously relative to each other or in opposite directions. When the two first rectangular abutting rods move in opposite directions, the opposite sides of the two first rectangular abutting rods are in contact with the inner wall of the elevator guide rail, thereby centering and fixing the position of the first rectangular box body, facilitating the staff to disassemble and assemble the first positioning assembly.

[0011] Preferably, a first worm is rotatably connected between the front and rear sides of the inner wall of the first rectangular box near the top. The first worm is in meshing transmission with a first worm gear, and the first worm drives the first worm gear to rotate.

[0012] Preferably, a first knob is rotatably connected to the front side of the first rectangular box near the top. The rotating shaft of the first knob is coaxially connected to the front end of the rotating shaft of the first worm, which is convenient for the staff to rotate the first worm.

[0013] Preferably, a first controller is provided at the rear side of the top of the first mounting plate. The first controller is built-in with a battery. The infrared emitter is electrically connected to the first controller through a wire. The first controller is responsible for controlling the operation of the infrared emitter, providing power and adjusting the emission parameters. The built-in battery ensures that the device can still work stably without an external power source.

[0014] Preferably, a second worm gear is rotatably connected inside the second rectangular box near the top. Both the left and right ends of the rotating shaft of the second worm gear are coaxially connected with second lead screws. Two second rectangular abutting rods are respectively threadedly connected to the outside of the two second lead screws. The second rectangular abutting rods are slidably connected to the second rectangular box. The second worm gear drives the two second lead screws to rotate, so that the two second lead screws respectively drive the two second rectangular abutting rods to move. The two second rectangular abutting rods move synchronously relative to each other or in opposite directions. When the two second rectangular abutting rods move in opposite directions, the opposite side surfaces of the two second rectangular abutting rods are both abutted against the inner wall of the elevator guide rail, so that the second rectangular box is centered and fixed in position, which is convenient for the staff to disassemble and assemble the second positioning component.

[0015] Preferably, a second worm is rotatably connected between the front and rear sides of the inner wall of the second rectangular box near the bottom. The second worm is in meshing transmission with the second worm gear, and the second worm drives the second worm gear to rotate.

[0016] Preferably, a second knob is rotatably connected to the front side of the second rectangular box near the bottom. The rotating shaft of the second knob is coaxially connected to the front end of the rotating shaft of the second worm, which is convenient for the staff to rotate the second worm.

[0017] Preferably, a second controller is provided at the rear side of the bottom of the second mounting plate. The second controller is built-in with a battery. A warning light and a buzzer are also provided at the top of the second mounting plate. The warning light, the buzzer and the light sensor are respectively electrically connected to the second controller through wires. The second controller is used to receive the data collected by the light sensor. When the light sensor receives infrared rays, the second controller controls the warning light and the buzzer to work, reminding the staff that the elevator guide rail is in a calibrated state and does not need to be adjusted. This controller is also built-in with a battery to ensure the continuous operation of the device.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] 1. For this elevator guide rail calibration and adjustment assembly, the first positioning assembly and the second positioning assembly can be adjusted over a large range of distances as needed. Therefore, regardless of the height and width of the elevator shaft, this assembly can adapt. At the same time, due to its compact structure and convenient operation, it is particularly suitable for calibrating the guide rail in a narrow space, solving the problem of difficult operation in a narrow environment in the prior art.

[0020] 2. For this elevator guide rail calibration and adjustment assembly, through the cooperation of the infrared emitter and the optical sensor, precise detection of the position deviation of the elevator guide rail is achieved. The light beam emitted by the infrared emitter can directly reflect the alignment of the guide rail. When the guide rail is misaligned, the optical sensor cannot receive the signal, thus prompting the operator to make adjustments. This method is more intuitive and accurate than the traditional physical measurement method, effectively improving the calibration accuracy.

[0021] 3. For this elevator guide rail calibration and adjustment assembly, through the design of the indicator light and the buzzer, when the optical sensor detects the correct docking state of the guide rail, the indicator light and the buzzer will automatically emit signals to remind the operator, which greatly reduces the judgment errors during manual operation. At the same time, even in a poor ambient light environment, the calibration accuracy can be ensured through the sound and light prompts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is the overall structural schematic diagram of the present utility model;

[0023] Figure 2 is the assembly structural schematic diagram of the first positioning assembly and the infrared emission assembly in the present utility model;

[0024] Figure 3 is the structural schematic diagram of the first positioning assembly in the present utility model;

[0025] Figure 4 is the assembly structural schematic diagram of the second positioning assembly and the detection assembly in the present utility model;

[0026] Figure 5 is the structural schematic diagram of the second positioning assembly in the present utility model;

[0027] In the figure: 1. First positioning component; 10. First rectangular box body; 11. First worm gear; 12. First lead screw; 13. First rectangular abutting rod; 14. First worm; 15. First knob; 2. Second positioning component; 20. Second rectangular box body; 21. Second worm gear; 22. Second lead screw; 23. Second rectangular abutting rod; 24. Second worm; 25. Second knob; 3. Infrared emission component; 30. First mounting plate; 31. Infrared emitter; 32. First controller; 4. Detection component; 40. Second mounting plate; 41. Light sensor; 42. Second controller; 43. Warning light; 44. Buzzer. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0031] An elevator guide rail calibration and adjustment component, including a first positioning component 1 and a second positioning component 2. The first positioning component 1 and the second positioning component 2 are both detachably connected to the elevator guide rail. When in use, the first positioning component 1 is located above the second positioning component 2. The first positioning component 1 is fixed in the upper elevator guide rail, and the second positioning component 2 is fixed in the lower elevator guide rail. Moreover, the distance between the first positioning component 1 and the second positioning component 2 can be adjusted within a large range according to needs, and it is also suitable for operation in an environment with a narrow elevator shaft.

[0032] The first positioning component 1 includes a first rectangular box body 10. The rear side of the first rectangular box body 10 is attached to the rear side of the inner wall of the elevator guide rail. On both the left and right sides of the first rectangular box body 10, there are first rectangular abutting rods 13 that can be adjusted left and right. The opposite sides of the two first rectangular abutting rods 13 are respectively abutted against the left and right sides of the inner wall of the elevator guide rail, and can center and fix the first rectangular box body 10. At the bottom of the front side of the first rectangular box body 10, there is an infrared emission component 3. The infrared emission component 3 includes a first mounting plate 30 fixedly connected to the front side of the first rectangular box body 10. In the middle of the bottom of the first mounting plate 30, there is an infrared emitter 31. The infrared emitter 31 is used to emit an infrared beam, which irradiates the detection component 4 to detect the position deviation of the guide rail, so as to provide a reference for calibration;

[0033] The second positioning component 2 includes a second rectangular box body 20. The rear side of the second rectangular box body 20 is attached to the rear side of the inner wall of the elevator guide rail. On both the left and right sides of the second rectangular box body 20, there are second rectangular abutting rods 23 that can be adjusted left and right. The opposite sides of the two second rectangular abutting rods 23 are respectively abutted against the left and right sides of the inner wall of the elevator guide rail, and can center and fix the second rectangular box body 20. At the top of the front side of the second rectangular box body 20, there is a detection component 4. The detection component 4 includes a second mounting plate 40 fixedly connected to the front side of the second rectangular box body 20. In the middle of the top of the second mounting plate 40, there is a light sensor 41. The detection component 4 is responsible for receiving the infrared light signal and detecting the infrared light signal through the light sensor 41. When the light sensor 41 cannot receive the infrared light, it means that the upper and lower adjacent elevator guide rails are misaligned, and the position of the elevator guide rail needs to be adjusted. When the light sensor 41 receives the infrared light, it means that the upper and lower adjacent elevator guide rails are in a standard docking state.

[0034] In this embodiment, a first worm gear 11 is rotatably connected at a position near the bottom inside the first rectangular box body 10. At the left and right ends of the rotating shaft of the first worm gear 11, there are first lead screws 12 coaxially connected. The two first rectangular abutting rods 13 are respectively threadedly connected to the outside of the two first lead screws 12. The first rectangular abutting rods 13 are slidably connected to the first rectangular box body 10. By driving the two first lead screws 12 to rotate through the first worm gear 11, the two first lead screws 12 respectively drive the two first rectangular abutting rods 13 to move. The two first rectangular abutting rods 13 move synchronously in opposite directions or in the opposite direction. When the two first rectangular abutting rods 13 move in the opposite direction, the opposite sides of the two first rectangular abutting rods 13 are both abutted against the inner wall of the elevator guide rail, so as to center and fix the position of the first rectangular box body 10, which is convenient for the staff to disassemble and assemble the first positioning component 1.

[0035] Specifically, a first worm 14 is rotatably connected between the front and rear sides of the inner wall of the first rectangular box body 10 near the top. The first worm 14 is in meshing transmission with the first worm gear 11, and the first worm 14 is used to drive the first worm gear 11 to rotate.

[0036] Further, a first knob 15 is rotatably connected to the front side of the first rectangular box body 10 near the top. The rotating shaft of the first knob 15 is coaxially connected to the front end of the rotating shaft of the first worm 14, facilitating the staff to rotate the first worm 14.

[0037] Further, a first controller 32 is provided at the rear side of the top of the first mounting plate 30. The first controller 32 is built-in with a battery. The infrared emitter 31 is electrically connected to the first controller 32 through a wire. The first controller 32 is responsible for controlling the operation of the infrared emitter 31, providing power and adjusting the emission parameters. With the built-in battery, it ensures that the device can still work stably without an external power source.

[0038] Further, a second worm gear 21 is rotatably connected to the position near the top inside the second rectangular box body 20. The left and right ends of the rotating shaft of the second worm gear 21 are both coaxially connected with a second lead screw 22. Two second rectangular abutting rods 23 are respectively threadedly connected to the outer sides of the two second lead screws 22. The second rectangular abutting rods 23 are slidably connected to the second rectangular box body 20. By driving the two second lead screws 22 to rotate through the second worm gear 21, the two second lead screws 22 respectively drive the two second rectangular abutting rods 23 to move. The two second rectangular abutting rods 23 move synchronously towards each other or in opposite directions. When the two second rectangular abutting rods 23 move in opposite directions, the opposite side surfaces of the two second rectangular abutting rods 23 are both abutted against the inner wall of the elevator guide rail, so that the second rectangular box body 20 is centered and fixed in position, facilitating the staff to disassemble and assemble the second positioning assembly 2.

[0039] Further, a second worm 24 is rotatably connected between the front and rear sides of the inner wall of the second rectangular box body 20 near the bottom. The second worm 24 is in meshing transmission with the second worm gear 21, driving the second worm gear 21 to rotate through the second worm 24.

[0040] Further, a second knob 25 is rotatably connected to the front side of the second rectangular box body 20 near the bottom. The rotating shaft of the second knob 25 is coaxially connected to the front end of the rotating shaft of the second worm 24, facilitating the staff to rotate the second worm 24.

[0041] Further, a second controller 42 is provided at the rear side of the bottom of the second mounting plate 40. The second controller 42 is built-in with a battery. A warning light 43 and a buzzer 44 are also provided on the top of the second mounting plate 40. The warning light 43, the buzzer 44 and the light sensor 41 are respectively electrically connected to the second controller 42 through wires. The second controller 42 is used to receive the data collected by the light sensor 41. When the light sensor 41 receives infrared rays, the second controller 42 controls the warning light 43 and the buzzer 44 to work, reminding the staff that the elevator guide rail is in a calibrated state and does not need to be adjusted. This controller is also built-in with a battery to ensure the continuous operation of the device.

[0042] When the elevator guide rail calibration and adjustment component of this embodiment is in use, first, fix the first positioning component 1 on the upper part of the elevator guide rail. The staff rotates the first knob 15, and the first knob 15 drives the first worm 14 to rotate. The first worm 14 drives the first worm gear 11 to rotate, and the first worm gear 11 drives the two first lead screws 12 to rotate, so that the two first lead screws 12 respectively drive the two first rectangular abutting rods 13 to move synchronously in opposite directions. The opposite side surfaces of the two first rectangular abutting rods 13 are in contact with the inner wall of the elevator guide rail, so that the first rectangular box body 10 is centered and fixed in position. Then, install the second positioning component 2 on the lower part of the elevator guide rail. Similar to the first positioning component 1, the staff rotates the second knob 25, and the second knob 25 drives the second worm 24 to rotate. The second worm 24 drives the second worm gear 21 to rotate, and the second worm gear 21 drives the two second lead screws 22 to rotate, so that the two second lead screws 22 respectively drive the two second rectangular abutting rods 23 to move synchronously in opposite directions. The opposite side surfaces of the two second rectangular abutting rods 23 are in contact with the inner wall of the elevator guide rail, so that the second rectangular box body 20 is centered and fixed in position. Through the adjustable design of the first positioning component 1 and the second positioning component 2, the distance between the first positioning component 1 and the second positioning component 2 can be flexibly adjusted according to the height of the elevator shaft to meet the guide rail detection requirements of different heights. Next, start the infrared emitter 31 on the first positioning component 1, which will emit an infrared beam. The beam irradiates along the guide rail to the second positioning component 2 below. The light sensor 41 on the second positioning component 2 is responsible for receiving the infrared light signal. When the two elevator guide rails are aligned, the light sensor 41 can receive the infrared signal; if the guide rails are misaligned, the light sensor 41 will not be able to receive the signal. At this time, the operator needs to adjust the position of the guide rail according to the detection feedback until the light sensor 41 receives the infrared light signal to confirm that the guide rails are correctly docked. If the light sensor 41 detects the infrared light signal, the indicator light 43 and the buzzer 44 on the second positioning component 2 will automatically prompt the operator, indicating that the guide rails are correctly docked and no further adjustment is required. When the light sensor 41 does not receive the infrared light, it means that the upper and lower guide rails are misaligned, and the operator needs to manually adjust the position until the calibration is completed. During the whole process, the built-in batteries of the first controller 32 and the second controller 42 ensure that the device can work normally without an external power supply.

[0043] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. Elevator guide rail calibration and adjustment assembly, including a first positioning assembly (1) and a second positioning assembly (2), characterized in that: The first positioning assembly (1) and the second positioning assembly (2) are both detachably connected to the elevator guide rail. The first positioning assembly (1) comprises a first rectangular box (10). The first rectangular box (10) is provided with first rectangular support rods (13) that can be adjusted leftward and rightward on both sides. The bottom of the front side of the first rectangular box (10) is provided with an infrared emitting assembly (3). The infrared emitting assembly (3) comprises a first mounting plate (30) fixedly connected to the front side of the first rectangular box (10). An infrared emitter (31) is provided in the middle of the bottom of the first mounting plate (30). The second positioning assembly (2) comprises a second rectangular box (20). The second rectangular box (20) is provided with second rectangular support rods (23) that can be adjusted leftward and rightward on both sides. The top of the front side of the second rectangular box (20) is provided with a detection assembly (4). The detection assembly (4) comprises a second mounting plate (40) fixedly connected to the front side of the second rectangular box (20). A light sensor (41) is provided in the middle of the top of the second mounting plate (40).

2. The elevator guide rail calibration and adjustment assembly according to claim 1, characterized in that: A first worm gear (11) is rotatably connected in the first rectangular box (10) near the bottom, and the left and right ends of the rotating shaft of the first worm gear (11) are coaxially connected to the first screw rod (12), and two first rectangular abutting rods (13) are respectively threadedly connected to the outer sides of the two first screw rods (12), and the first rectangular abutting rods (13) are slidably connected to the first rectangular box (10).

3. The elevator guide rail calibration and adjustment assembly according to claim 2, characterized in that: A first worm (14) is rotatably connected between the front and rear sides of the inner wall of the first rectangular box (10) and close to the top, and the first worm (14) is meshed with the first worm wheel (11) for transmission.

4. The elevator guide rail calibration and adjustment assembly according to claim 3, wherein: A first knob (15) is rotatably connected to the front side of the first rectangular box (10) and close to the top, and the rotation axis of the first knob (15) is coaxially connected to the front end of the rotation axis of the first worm gear (14).

5. The elevator guide rail calibration and adjustment assembly according to claim 1, characterized in that: A first controller (32) is provided on the rear side of the top of the first mounting plate (30); the first controller (32) has a built-in battery; and the infrared transmitter (31) is electrically connected to the first controller (32) via a wire.

6. The elevator guide rail calibration and adjustment assembly according to claim 1, characterized in that: A second worm gear (21) is rotatably connected in the second rectangular box (20) near the top, and the left and right ends of the rotating shaft of the second worm gear (21) are coaxially connected to the second screw rod (22), and two second rectangular abutting rods (23) are respectively threadedly connected to the outer sides of the two second screw rods (22), and the second rectangular abutting rods (23) are slidably connected to the second rectangular box (20).

7. The elevator guide rail calibration and adjustment assembly according to claim 6, wherein: A second worm (24) is rotatably connected between the front and rear sides of the inner wall of the second rectangular box (20) and close to the bottom, and the second worm (24) is meshed with the second worm wheel (21) for transmission.

8. The elevator guide rail calibration and adjustment assembly according to claim 7, characterized in that: A second knob (25) is rotatably connected to the front side of the second rectangular box (20) and close to the bottom, and the rotation axis of the second knob (25) is coaxially connected to the front end of the rotation axis of the second worm (24).

9. The elevator guide rail calibration and adjustment assembly according to claim 1, characterized in that: A second controller (42) is provided at the rear side of the bottom of the second mounting plate (40). The second controller (42) is built-in with a battery. A warning light (43) and a buzzer (44) are further provided at the top of the second mounting plate (40). The warning light (43), the buzzer (44) and the optical sensor (41) are electrically connected to the second controller (42) through wires respectively.

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