Arcuate linear light source device
By designing an arc-shaped linear light source device, adjusting the angle and distance of the light-emitting components, and adapting to complex curved surfaces, the problem of poor adaptability of traditional linear light sources is solved, achieving efficient illumination uniformity and image reliability.
Patent Information
- Application Number
- CN202522032983.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-19
AI Technical Summary
Traditional linear light sources cannot guarantee the illumination effect when inspecting products with complex and irregular curved surfaces, and have poor adaptability.
Design an arc-shaped linear light source device. The light-emitting component is movably connected to the mounting groove composed of arc-shaped grooves and straight grooves. The angle and distance of the light-emitting component can be adjusted. Multiple light-emitting components can be independently controlled to adapt to complex curved surfaces.
It achieves light adaptation to complex curved surfaces, improves illumination uniformity and adaptability, eliminates edge overexposure and center underexposure problems, and ensures image consistency and reliability.
Smart Images
Figure CN224932619U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of detection light source technology, and in particular to an arc-shaped linear light source device. Background Technology
[0002] In the field of machine vision, the appearance of a product is usually inspected by a light source. When the product to be inspected has a curved surface, a linear light source is usually used as the inspection light source. It is suitable for inspecting simple and regular curved surfaces, such as cylindrical batteries. However, when faced with products with more complex and irregular curved surfaces, conventional linear light sources illuminate the product to be inspected from a fixed angle. Therefore, traditional linear light sources often cannot guarantee the inspection illumination effect and have poor adaptability. Utility Model Content
[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an arc-shaped linear light source device that can adjust the angle and distance of the light emitted by the light-emitting element, and has good adaptability.
[0004] To achieve the above objectives, this utility model provides an arc-shaped linear light source device, which includes a base, a heat sink, and a light-emitting component; a mounting plate with a mounting groove; the mounting groove is composed of an arc-shaped groove and multiple straight grooves; one end of each straight groove is connected to the arc-shaped groove, and the straight groove extends away from the arc-shaped groove; the multiple straight grooves are arranged alternately along an arc path; the light-emitting component includes a light-emitting element and a connector; the bottom of the light-emitting element has a light-emitting surface, which is an inwardly concave arc surface; the side of the light-emitting element is detachably connected to the connector, and the connector is movably disposed in the mounting groove and detachably connected to the mounting plate.
[0005] Furthermore, it also includes a lighting control component, which is connected to the mounting plate; multiple light-emitting components are provided; the lighting control component is electrically connected to multiple light-emitting components and can control the independent opening and closing of the light-emitting components.
[0006] Furthermore, the angle between the arc normal and the vertical normal of the emitting surface of at least one of the light-emitting components is less than or equal to 15° and greater than or equal to 0°; the angle between the arc normal and the vertical normal of the emitting surface of at least one of the light-emitting components is less than or equal to 45° and greater than or equal to 15°; the angle between the arc normal and the vertical normal of the emitting surface of at least one of the light-emitting components is less than or equal to 90° and greater than or equal to 45°.
[0007] Furthermore, at least a portion of the light-emitting components are arranged symmetrically with respect to the horizontal plane.
[0008] Furthermore, there are two mounting plates, which are arranged opposite to each other and spaced apart; the mounting slots of the two mounting plates are arranged opposite to each other; there are two connectors, which are movably disposed in the mounting slots of the two mounting plates and are detachably connected to the opposite ends of the light-emitting element.
[0009] Furthermore, there are two mounting slots, spaced apart; there are two connectors, each movably disposed within one of the two mounting slots, and each detachably connected to the same side of the light-emitting element.
[0010] Furthermore, the light-emitting element includes a mounting base, a transparent plate, and a light-emitting structure; the mounting base is provided with a light-emitting port and a receiving cavity, the light-emitting port is located at the bottom end of the mounting base and communicates with the receiving cavity; the light-emitting structure is located inside the receiving cavity; the transparent plate is located at the light-emitting port; the transparent plate is arc-shaped, and the end face of the transparent plate away from the light-emitting structure is the light-emitting surface.
[0011] Furthermore, the light-emitting component also includes a cooling fan, a fan controller, and a temperature detection device; the cooling fan, the fan controller, and the temperature detection device are all connected to the mounting base; the temperature detection device is used to detect the temperature of the light-emitting component; the cooling fan is used to blow gas toward the mounting base; the fan controller is electrically connected to the temperature detection device and the cooling fan, and is capable of controlling the fan speed of the cooling fan.
[0012] Furthermore, the top surface of the mounting base is an arc surface; multiple cooling fans are provided, and the multiple cooling fans are arranged sequentially and at intervals on the top surface of the mounting base, and are detachably connected to the mounting base.
[0013] Furthermore, the side end of the mounting base is provided with a plurality of connection holes, which are arranged at intervals along the height direction of the mounting base; the connector is connected to the mounting plate and can pass through any of the connection holes of the mounting base to connect with the mounting base.
[0014] Compared with the prior art, the present invention has the following advantages: In the embodiments of the present invention, the bottom of the light-emitting element can face the workpiece to be tested, so that the light emitted by the light-emitting element can pass through the light-emitting surface and illuminate the workpiece to be tested. The light-emitting surface is an arc surface, so that the light can better adapt to the curved surface of the workpiece to be tested and the light illumination is more uniform. The light-emitting element is connected to the mounting plate through a connector. The mounting plate is provided with a mounting groove. The side of the light-emitting element is connected to the connector. The connector can move in the mounting groove. Since the mounting groove is composed of an arc groove and a straight groove, the movement of the connector in the arc groove can drive the light-emitting element to move around a circular path to adjust the orientation of the light-emitting surface of the light-emitting element, thereby adjusting the direction of the light emitted by the light-emitting element to adapt to the curved surface of the workpiece to be tested. The arc groove is connected to the straight groove. The connector can enter the straight groove from the arc groove and can move in the straight groove, thereby adjusting the illumination distance between the light-emitting element and the light-emitting surface, thereby controlling the illumination brightness and uniformity. Attached Figure Description
[0015] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the arc-shaped linear light source device of this utility model;
[0017] Figure 2 This is a schematic diagram of the mounting plate of the arc-shaped linear light source device of this utility model;
[0018] Figure 3 This is a schematic diagram of the light-emitting component of the arc-shaped linear light source device of this utility model;
[0019] Figure 4 This is a schematic diagram of the light-emitting component of the arc-shaped linear light source device of this utility model from another perspective;
[0020] Figure 5 This is a cross-sectional view of the light-emitting component of the arc-shaped linear light source device of this utility model.
[0021] Reference numerals: Mounting plate 100; Mounting groove 110; Arc groove 111; Straight groove 112; Light-emitting component 200; Light-emitting element 210; Light-emitting surface 211; Mounting base 220; Light outlet 221; Receiving cavity 222; Connecting hole 223; Transparent plate 230; Light-emitting structure 240; Cooling fan 250. Detailed Implementation
[0022] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0024] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.
[0025] Please see Figures 1 to 5 This utility model provides an arc-shaped linear light source device, which includes a mounting plate 100 and a light-emitting component 200. The mounting plate 100 is provided with a mounting groove 110, which is composed of an arc-shaped groove 111 and a straight groove 112. One end of the straight groove 112 is connected to the arc-shaped groove 111, and the straight groove 112 extends in a direction away from the arc-shaped groove 111. Multiple straight grooves 112 are provided and are arranged at intervals along an arc path. The light-emitting component 200 includes a light-emitting element 210 and a connector. The bottom of the light-emitting element 210 is provided with a light-emitting surface 211, which is an inwardly concave arc surface. The side of the light-emitting element 210 is detachably connected to the connector, and the connector is movably disposed in the mounting groove 110 and detachably connected to the mounting plate 100.
[0026] In this embodiment of the invention, the bottom of the light-emitting element 210 can face the workpiece to be inspected, so that the light emitted by the light-emitting element 210 can pass through the light-emitting surface 211 and illuminate the workpiece. The light-emitting surface 211 is an arc surface, which allows the light to better adapt to the curved surface of the workpiece and makes the light illumination more uniform. The light-emitting element 210 is connected to the mounting plate 100 through a connector. A mounting groove 110 is provided on the mounting plate 100. A connector is connected to the side of the light-emitting element 210. The connector can move within the mounting groove 110. Since the mounting groove 110 is an arc-shaped groove... The device consists of an arc-shaped groove 111 and a straight groove 112. The connecting member moves within the arc-shaped groove 111, which can drive the light-emitting element 210 to move around a circular path to adjust the orientation of the light-emitting surface 211 of the light-emitting element 210. This allows the direction of the light emitted by the light-emitting element 210 to be adjusted to match the curved surface of the workpiece to be inspected. The arc-shaped groove 111 is connected to the straight groove 112. The connecting member can enter the straight groove 112 from the arc-shaped groove 111 and move within the straight groove 112, thereby adjusting the illumination distance between the light-emitting element 210 and the light-emitting surface 211, thus controlling the illumination brightness and uniformity.
[0027] Specifically, multiple straight grooves 112 are all located on the same side of the arc-shaped groove 111.
[0028] In some embodiments of this utility model, a lighting control component is also included, which is connected to the mounting plate 100; multiple light-emitting components 200 are provided; the lighting control component is electrically connected to the multiple light-emitting components 200 and can control the light-emitting elements 210 of the light-emitting components 200 to turn on and off independently.
[0029] By setting multiple light-emitting components 200, the diversity of the light irradiation on the workpiece to be inspected can be increased, the adaptability of lighting on workpieces with complex curved surfaces can be improved, and the problems of edge overexposure and center underexposure can be eliminated, thereby improving the uniformity of lighting. The lighting control component is electrically connected to the multiple light-emitting components 200 and can control the light-emitting elements 210 of the multiple light-emitting components 200 to turn on and off independently, so that the lighting control component can control them.
[0030] Specifically, multiple light-emitting components 200 are arranged in a sequential and spaced manner around the annular path; the light emission angles of the multiple light-emitting components 200 are different from each other.
[0031] Reference Figure 1 and Figure 2 In some embodiments of this utility model, the angle between the arc surface normal and the vertical normal of the light-emitting surface 211 of at least one light-emitting component 200 is less than or equal to 15° and greater than or equal to 0°. The light-emitting component 200 can provide tangential grazing light to detect longitudinal scratches and shallow textures. The light emitted by the light-emitting component 200 undergoes uniform diffuse reflection on the arc surface, highlighting surface contamination and material unevenness.
[0032] At least one light-emitting component 200 has an angle between the arc surface normal and the vertical normal of the light-emitting surface 211 of at least one light-emitting component 200 that is less than or equal to 45° and greater than or equal to 15°. The light-emitting component 200 can provide uniform diffuse light to detect dirt, oil stains, and uniformity. The light emitted by the light-emitting component 200 undergoes uniform diffuse reflection on the arc surface, highlighting surface contamination and material inhomogeneity.
[0033] At least one light-emitting component 200 has an angle between the arc normal of its light-emitting surface 211 and the vertical normal that is less than or equal to 90° and greater than or equal to 45°. The light-emitting component 200 can provide perpendicular incident light to detect pits, chipped edges, and translucent defects. The light is incident almost perpendicularly, and deep defects can be detected by changes in reflected light intensity.
[0034] Specifically, the lighting controller can control the following four states to cycle sequentially: the light-emitting component 200 with an angle of 15° between the arc normal of the light-emitting surface 211 and the vertical normal is activated; the light-emitting component 200 with an angle of 45° between the arc normal of the light-emitting surface 211 and the vertical normal is activated; the light-emitting component 200 with an angle of 75° between the arc normal of the light-emitting surface 211 and the vertical normal is activated; and all light-emitting components 200 are completely dark. The lighting duration of each group of light-emitting components 200 is controlled to be 2ms. In the middle of the stable segment of each 2ms lighting window, for example, 0.5ms after activation, the lighting controller generates a high-level pulse signal to the industrial camera, triggering the camera to perform exposure acquisition. This ensures that the camera always captures the image when the light source brightness is most stable, avoiding interference from the rising / falling edges when the light-emitting components 200 are turned on and off, and greatly improving the consistency and reliability of the image.
[0035] It can achieve time-division lighting of each group of light-emitting elements 210 according to a preset program, thereby triggering the camera to expose synchronously.
[0036] Reference Figure 1 and Figure 2 In some embodiments of this utility model, at least some of the light-emitting components 200 are arranged symmetrically with respect to the horizontal plane in order to further ensure the uniformity of illumination.
[0037] Specifically, the mounting plate 100 is placed vertically, and the light-emitting component 200 emits light vertically downwards or vertically upwards.
[0038] Reference Figure 1 In some embodiments of this utility model, two mounting plates 100 are provided, which are arranged opposite to each other and spaced apart; the mounting grooves 110 of the two mounting plates 100 are arranged opposite to each other; two connectors are provided, which are movably arranged in the mounting grooves 110 of the two mounting plates 100 respectively, and are detachably connected to the two opposite ends of the light-emitting element 210 respectively.
[0039] Both ends of the light-emitting element 210 are connected to connectors. The two connectors are movably disposed in the mounting grooves 110 of the two mounting plates 100. The two connectors are connected to the two mounting plates 100 respectively to improve the stability of fixing the position of the light-emitting element 210.
[0040] Reference Figure 1 In some embodiments of this utility model, there are two mounting slots 110, which are spaced apart; there are two connectors, which are movably disposed in the two mounting slots 110 and are detachably connected to the same side of the light-emitting element 210.
[0041] Two mounting slots 110 are provided on the same mounting plate 100. The extension directions of the straight grooves 112 of the two mounting slots 110 are set one-to-one, so that the two connectors can be connected to the same side of a light-emitting component 200, which can improve the stability of the fixed position of the light-emitting component 210.
[0042] Reference Figures 3 to 5 In some embodiments of this utility model, the light-emitting element 210 includes a mounting base 220, a transparent plate 230, and a light-emitting structure 240; the mounting base 220 is provided with a light-emitting port 221 and a receiving cavity 222, the light-emitting port 221 is located at the bottom end of the mounting base 220 and is connected to the receiving cavity 222; the light-emitting structure 240 is located inside the receiving cavity 222; the transparent plate 230 is located at the light-emitting port 221; the transparent plate 230 is arc-shaped, and the end face of the transparent plate 230 away from the light-emitting structure 240 is the light-emitting surface 211.
[0043] The light-emitting structure 240 is disposed in the receiving cavity 222. The light emitted by the light-emitting structure 240 is directed toward the light outlet 221 and passes through the transparent plate 230 to the outside. The transparent plate 230 is curved, so that the end face of the transparent plate 230 away from the light-emitting structure 240 is the light-emitting surface 211.
[0044] Specifically, the light outlet 221 is connected to the bottom of the receiving cavity 222. The top end face of the receiving cavity 222 is an arc surface. Multiple light-emitting structures 240 are provided and arranged sequentially on the top surface of the receiving cavity 222, so that the multiple light-emitting structures 240 are arranged along an arc path, which can adapt to the curved surface of the workpiece to be inspected.
[0045] Specifically, the light-emitting structure 240 is an LED lamp bead structure.
[0046] Reference Figure 4 and Figure 5In some embodiments of this utility model, the light-emitting component 200 further includes a cooling fan 250, a fan controller, and a temperature detection component; the cooling fan 250, the fan controller, and the temperature detection component are all connected to the mounting base 220; the temperature detection component is used to detect the temperature of the light-emitting component 210; the cooling fan 250 is used to blow gas toward the mounting base 220; the fan controller is electrically connected to the temperature detection component and the cooling fan 250, and is able to control the fan speed of the cooling fan 250.
[0047] The light-emitting structure 240 emits a large amount of heat during operation. A temperature detection element is provided on the mounting base 220. The temperature detection element can detect the temperature of the mounting base 220 and send the detected temperature to the fan control element via an electrical signal. The fan control element is electrically connected to the cooling fan 250. When the temperature detected by the temperature detection element is high, the fan control element can control the cooling fan 250 to increase its rotation speed to ensure the cooling capacity of the cooling fan 250. When the temperature detected by the temperature detection element is low, the fan control element can control the cooling fan 250 to decrease its rotation speed.
[0048] The active fan cooling solution based on temperature feedback can effectively solve the problem of thermal attenuation of ordinary light sources, reduce the operating temperature fluctuation range of the light-emitting components by 200°C, improve the stability range of light intensity output fluctuation, meet the stability requirements of industrial testing, and the heat dissipation solution is simple in structure, low in cost, highly reliable, and easier to maintain and promote.
[0049] Specifically, the temperature sensor has a sampling frequency of 10Hz and a built-in PID control algorithm. It compares the collected temperature value with the preset target temperature value and calculates the difference. Based on the deviation, it adjusts the duty cycle of the PWM signal output to the cooling fan in real time. The higher the temperature, the larger the PWM duty cycle and the faster the fan speed. This closed-loop control actively and dynamically stabilizes the temperature of the mounting base within a small fluctuation range, such as 35°C ± 3°C, thereby suppressing thermal decay and color drift at the source.
[0050] Specifically, the cooling fan 250 can be a turbine fan or a centrifugal fan.
[0051] Specifically, the fan control unit and the lighting control unit can be of the same structure. For example, a microprocessor can be used to simultaneously control the start and stop of the light-emitting element 210, as well as the rotation speed and start and stop of the cooling fan 250.
[0052] Reference Figures 3 to 5 In some embodiments of this utility model, the top surface of the mounting base 220 is an arc surface; multiple cooling fans 250 are provided, and the multiple cooling fans 250 are arranged in sequence at intervals on the top surface of the mounting base 220 and are detachably connected to the mounting base 220.
[0053] The multiple cooling fans 250 arranged in an arc shape can be adapted to the light-emitting structure 240 arranged in an arc shape to improve the heat dissipation capacity; the cooling fans 250 and the mounting base 220 are detachably connected, and the position of the cooling fans 250 can be adjusted to further ensure the heat dissipation effect.
[0054] Specifically, the light-emitting surface 211 of the light-emitting element 210 is a first semi-circular arc surface, the top surface of the receiving cavity 222 is a second semi-circular arc surface, and the top surface of the mounting base 220 is a third semi-circular arc surface. The centers of the first, second, and third semi-circular arc surfaces are arranged to coincide.
[0055] Reference Figure 3 and Figure 4 In some embodiments of this utility model, the side end of the mounting base 220 is provided with a connecting hole 223. There are multiple connecting holes 223, which are arranged sequentially at intervals along the height direction of the mounting base 220. The connector is connected to the mounting plate 100 and can pass through any connecting hole 223 of the mounting base 220 to connect with the mounting base 220.
[0056] The connector can be selected to pass through any of the connection holes 223 of the mounting base 220, which can control the position of the mounting base 220 relative to the mounting plate 100, thereby adjusting the distance between the light-emitting element 210 and the object to be tested, thus further improving the adjustability of the position of the light-emitting element 210.
[0057] Specifically, the connector is rotatably inserted through the connection hole 223, allowing the mounting base 220 to rotate relative to the connector to adjust the orientation of the mounting base 220, thereby adjusting the orientation of the light-emitting surface 211 of the light-emitting element 210 and improving the compatibility with the workpiece to be tested. The connector can be a connecting bolt, which passes through the mounting groove 110 and is threadedly connected to the connection hole 223. The bolt head of the connector abuts against the mounting plate 100 and is fixedly connected to the mounting plate 100 by friction.
[0058] The above are merely preferred embodiments of the present utility model and are 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 shall be included within the protection scope of the present utility model.
Claims
1. An arc-shaped linear light source device, characterized in that, include: The mounting plate (100) is provided with a mounting groove (110); the mounting groove (110) is composed of an arc-shaped groove (111) and a plurality of straight grooves (112); one end of the straight groove (112) is connected to the arc-shaped groove (111), and the straight groove (112) extends in a direction away from the arc-shaped groove (111); the plurality of straight grooves (112) are arranged sequentially at intervals along an arc-shaped path; The light-emitting component (200) includes a light-emitting element (210) and a connector; the bottom of the light-emitting element (210) is provided with a light-emitting surface (211), which is an inwardly concave arc surface; the side of the light-emitting element (210) is detachably connected to the connector, and the connector is movably disposed in the mounting groove (110) and detachably connected to the mounting plate (100).
2. The arc-shaped linear light source device according to claim 1, characterized in that, It also includes a lighting control component connected to the mounting plate (100); multiple light-emitting components (200) are provided; the lighting control component is electrically connected to multiple light-emitting components (200) and can control the light-emitting elements (210) of the light-emitting components (200) to turn on and off independently.
3. The arc-shaped linear light source device according to claim 2, characterized in that, The angle between the arc normal and the vertical normal of the luminous surface (211) of at least one of the light-emitting components (200) is less than or equal to 15° and greater than or equal to 0°; the angle between the arc normal and the vertical normal of the luminous surface (211) of at least one of the light-emitting components (200) is less than or equal to 45° and greater than or equal to 15°; the angle between the arc normal and the vertical normal of the luminous surface (211) of at least one of the light-emitting components (200) is less than or equal to 90° and greater than or equal to 45°.
4. The arc-shaped linear light source device according to claim 2, characterized in that, At least a portion of the light-emitting components (200) are arranged symmetrically with respect to the horizontal plane.
5. The arc-shaped linear light source device according to claim 1, characterized in that, Two mounting plates (100) are provided, which are arranged opposite to each other and spaced apart; the mounting grooves (110) of the two mounting plates (100) are arranged opposite to each other; two connectors are provided, which are movably arranged in the mounting grooves (110) of the two mounting plates (100) respectively, and are detachably connected to the opposite two ends of the light-emitting element (210).
6. The arc-shaped linear light source device according to claim 1, characterized in that, Two mounting slots (110) are provided and spaced apart; two connectors are provided, each of which is movably disposed in one of the two mounting slots (110) and detachably connected to the same side of the light-emitting element (210).
7. The arc-shaped linear light source device according to claim 1, characterized in that, The light-emitting element (210) includes a mounting base (220), a transparent plate (230), and a light-emitting structure (240); the mounting base (220) is provided with a light-emitting port (221) and a receiving cavity (222), the light-emitting port (221) is located at the bottom end of the mounting base (220) and communicates with the receiving cavity (222); the light-emitting structure (240) is located inside the receiving cavity (222); the transparent plate (230) is located at the light-emitting port (221); the transparent plate (230) is arc-shaped, and the end face of the transparent plate (230) away from the light-emitting structure (240) is the light-emitting surface (211).
8. The arc-shaped linear light source device according to claim 7, characterized in that, The light-emitting component (200) also includes a cooling fan (250), a fan controller, and a temperature detection device; the cooling fan (250), the fan controller, and the temperature detection device are all connected to the mounting base (220); the temperature detection device is used to detect the temperature of the light-emitting component (210); the cooling fan (250) is used to blow gas toward the mounting base (220); the fan controller is electrically connected to the temperature detection device and the cooling fan (250), and is able to control the fan speed of the cooling fan (250).
9. The arc-shaped linear light source device according to claim 8, characterized in that, The top surface of the mounting base (220) is an arc surface; multiple cooling fans (250) are provided, and the multiple cooling fans (250) are arranged in sequence at intervals on the top surface of the mounting base (220) and are detachably connected to the mounting base (220).
10. The arc-shaped linear light source device according to claim 7, characterized in that, The mounting base (220) is provided with a connecting hole (223) on its side end. There are multiple connecting holes (223) and they are arranged at intervals along the height direction of the mounting base (220). The connector is connected to the mounting plate (100) and can be inserted through any of the connecting holes (223) of the mounting base (220) to connect with the mounting base (220).