An oil leak detection device suitable for confined spaces

Abstract

This invention discloses an oil leak detection device suitable for confined spaces, belonging to the field of detection device technology. It includes a base, an industrial robotic arm, a multi-stage telescopic assembly, an adjustment assembly, and a detection element. The adjustment assembly consists of multiple adjusting cylinders rotatably connected via an adjusting shaft, and utilizes permanent magnets, electromagnetic coils, and guide components to achieve angle adjustment, allowing the detection element to flexibly adapt to complex spaces. The detection element integrates a vision sensor, a lighting lamp, and a spraying assembly, capable of spraying soapy water or fluorescent detection liquid. Leaks are identified through visual analysis. The multi-stage telescopic assembly is controlled by an air pump to extend its telescopic range. The device is also equipped with a cleaning cylinder for automatic cleaning of the detection element. This device, through the coordinated control of the robotic arm, telescopic assembly, and adjustment assembly, achieves accurate and efficient detection of oil leaks in confined spaces, improving automation and adaptability.

Description

Technical Field

[0001] This invention relates to the field of leak detection device technology, specifically an oil leak detection device suitable for confined spaces. Background Technology

[0002] Oil leaks are common in industrial equipment, especially in hydraulic systems, tanks, and pipelines. Failure to detect them promptly can lead to equipment malfunctions, environmental pollution, and safety accidents. Existing leak detection methods include visual inspection, pressure testing, or the use of detection instruments, but these have significant limitations when dealing with narrow or complex spaces. For example, traditional detection devices often rely on rigid mechanical structures or simple probes, making it difficult to flexibly access winding or deep areas, resulting in blind spots. Furthermore, manual operation is not only inefficient but also susceptible to subjective factors, leading to a high rate of missed detections. Some automated equipment uses cameras or sensors, but lacks adaptive adjustment capabilities, making it impossible to accurately locate leaks in changing environments. Additionally, current methods of spraying detection fluids are mostly manual, failing to allow for rapid switching between different detection fluids, and post-detection cleaning and maintenance are inconvenient and prone to cross-contamination. Summary of the Invention

[0003] The purpose of this invention is to provide an oil leak detection device suitable for confined spaces, in order to solve the problems raised in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: including a base, on which an industrial robotic arm is mounted, a multi-stage telescopic assembly is connected to the end of the industrial robotic arm, an adjustment assembly is connected to the end of the multi-stage telescopic assembly, and a detection element is mounted on the adjustment assembly;

[0005] The adjustment assembly includes several adjustment cylinders, each with a fixed cylinder. Adjacent adjustment cylinders are rotatably connected by an adjustment shaft. The adjustment shaft has a threaded plate, which is connected to the fixed cylinder by a guide assembly.

[0006] The threaded plate is provided with a first magnetic component, and the fixed cylinder is provided with a second magnetic component.

[0007] The guiding assembly includes a guide shaft and a guide groove. The guide groove is disposed on the inner wall of the fixed cylinder, and the guide shaft is disposed on a threaded plate. The guide shaft is slidably connected to the guide groove, and multiple sets of guide shafts are provided.

[0008] The guide groove is spirally distributed, one end of the adjusting shaft extends out of the adjusting cylinder and is located inside the fixed cylinder, and the threaded plate is located inside the fixed cylinder.

[0009] The first magnetic component is a permanent magnet, and the second magnetic component is an electromagnetic coil. The electromagnetic coil is electrically connected to the control system. A return spring is connected between the threaded plate and the fixed cylinder. Both the adjusting cylinder and the fixed cylinder are made of magnetic shielding material. The return spring resets the threaded plate, ensuring that the threaded plate returns to the set position after the electromagnetic coil is de-energized. A displacement sensor is installed on the fixed cylinder to detect the movement distance of the threaded plate. The control system calculates the angle of the adjusting cylinder based on this movement distance.

[0010] The detection element includes a detection cylinder, which is disposed on the outermost adjusting cylinder. A vision sensor and a lighting lamp are disposed on the outside of the detection cylinder, and a spraying assembly is disposed inside the detection cylinder.

[0011] The spraying assembly includes a drive motor, two sets of cams, and two sets of stretching membranes. The two sets of stretching membranes are sequentially arranged on the inner wall of the detection cylinder. The stretching membranes have several folds and are elastic. The drive motor is located at the bottom of the detection cylinder. The two sets of cams are respectively mounted on the output shaft of the drive motor via a first one-way bearing and a second one-way bearing. The first one-way bearing and the second one-way bearing are mirror images of each other.

[0012] The detection cylinder facing the two sets of stretch membranes is provided with a filling port and several spray ports. One-way valves are provided in the spray ports. Soap solution is provided between one set of stretch membranes and the detection cylinder, and fluorescent detection solution is provided between the other set of stretch membranes and the detection cylinder.

[0013] The multi-stage telescopic assembly includes multiple sets of telescopic cylinders nested together, with a sliding seal connection between the sets of telescopic cylinders. A telescopic spring is connected between two adjacent telescopic cylinders, and an air pump is connected to the lowest telescopic cylinder through a pipe. The air pump is mounted on a base.

[0014] A cleaning cylinder is also provided on the base, and a collection box is installed below the cleaning cylinder. The collection box is located on the base. A water storage chamber is provided inside the cleaning cylinder. Several brushes are provided inside the cleaning cylinder. The brushes are hollow and one end of each brush is connected to the water storage chamber. The water storage chamber is connected to an external pumping system through a pipe.

[0015] A control box is installed on the base, and a control system is installed inside the control box.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. Adaptable to confined spaces, enhancing device flexibility. By combining an industrial robotic arm with a multi-stage telescopic assembly—comprising multiple nested telescopic cylinders—extension and retraction are achieved through air pump-controlled internal pressure and spring-assisted reset, allowing the device to reach deep or winding areas. The adjustment assembly utilizes multiple adjustment cylinders and shafts, driven by the magnetic interaction of electromagnetic coils and permanent magnets to move a threaded plate. Combined with a helical guide groove, this rotates the adjustment cylinder, adjusting the angle of the detection element. Utilizing magnetic drive and a guiding structure, non-contact angle adjustment is achieved, avoiding the complexity and space constraints of traditional mechanical transmission. Furthermore, the coordinated control of multi-stage telescopic and robotic arm allows the detection element to pass through narrow gaps and adapt to complex geometric spaces, significantly improving accessibility and flexibility, and solving the problem of existing equipment's rigid structure preventing it from reaching deep into confined areas.

[0018] 2. Precise detection and multi-mode recognition improve leak detection accuracy. The detection element integrates a vision sensor and illumination lamp to acquire images of the detection location in real time, and then sprays soap solution or fluorescent detection solution through a spraying assembly. The spraying assembly consists of a drive motor, cams, and a stretching membrane. The motor drives different cams in both forward and reverse directions via a one-way bearing, squeezing the stretching membrane to spray out the detection solution. The control system determines the leak point based on visual data. During soap solution detection, bubbling is observed; during fluorescent detection, the ultraviolet light mode is switched to capture fluorescent traces. By employing multi-mode detection solutions and intelligent visual analysis, combined with an elastic stretching membrane and one-way bearing control, precise spraying and rapid switching of detection modes are achieved. This allows for the capture of minute leak traces in dim or complex environments, avoiding subjective errors from manual detection and improving the accuracy and reliability of the detection. At the same time, real-time feedback adjusts the device's posture to optimize the detection path.

[0019] 3. Automated cleaning and maintenance improve equipment durability and efficiency. The device features a cleaning cylinder and a collection tank on its base. The cleaning cylinder contains a water storage chamber and hollow brushes, and liquid is supplied via a pumping system. After testing, a robotic arm moves the testing element into the cleaning cylinder. During its up-and-down movement, the brushes and liquid work together to clean surface oil stains. Wastewater flows into the collection tank for treatment. This integrated automated cleaning system efficiently removes oil stains through a combination of pumping and brushing, preventing contamination of the testing element from affecting subsequent tests. This reduces the need for manual maintenance, improves the equipment's continuous working capacity and service life, and the collection tank design facilitates wastewater treatment, meeting environmental protection requirements. The entire process integrates testing and cleaning, improving operational efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the industrial robotic arm in this invention;

[0022] Figure 3This is a schematic diagram of the telescopic cylinder in this invention;

[0023] Figure 4 This is a schematic diagram of the structure of the fixed cylinder in this invention;

[0024] Figure 5 yes Figure 4 A magnified view of a portion of region A in the middle;

[0025] Figure 6 This is a schematic diagram of the threaded plate in this invention;

[0026] Figure 7 This is a schematic diagram of the detection cylinder in this invention;

[0027] Figure 8 This is a schematic diagram of the cam structure in this invention;

[0028] Figure 9 This is a schematic diagram of the drive motor in this invention.

[0029] In the diagram: 1. Base; 2. Industrial robotic arm; 3. Multi-stage telescopic assembly; 31. Telescopic cylinder; 4. Adjustment assembly; 41. Adjustment cylinder; 42. Adjustment shaft; 43. Fixed cylinder; 431. Guide groove; 44. Threaded plate; 441. Guide shaft; 45. Permanent magnet; 46. Electromagnetic coil; 5. Detection element; 51. Detection cylinder; 52. Vision sensor; 53. Lighting lamp; 54. Drive motor; 55. Cam; 56. Stretch membrane; 6. Cleaning cylinder; 61. Collection box. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments 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.

[0031] Example: Figures 1-9As shown, the present invention provides a technical solution for an oil leak detection device suitable for narrow spaces, including a base 1, an industrial robotic arm 2 mounted on the base 1, a multi-stage telescopic assembly 3 connected to the end of the industrial robotic arm 2, an adjustment assembly 4 connected to the end of the multi-stage telescopic assembly 3, and a detection element 5 mounted on the adjustment assembly 4; the adjustment assembly 4 includes several adjustment cylinders 41, a fixed cylinder 43 mounted on each adjustment cylinder 41, adjacent adjustment cylinders 41 being rotatably connected by an adjustment shaft 42, a threaded plate 44 mounted on the adjustment shaft 42, and the threaded plate 44 being connected to the fixed cylinder 43 by a guide assembly; a first magnetic component is mounted on the threaded plate 44, a second magnetic component is mounted inside the fixed cylinder 43, and a control box (not shown in the figure) is mounted on the base 1, containing a control system.

[0032] The guide assembly includes a guide shaft 441 and a guide groove 431. The guide groove 431 is disposed on the inner wall of the fixed cylinder 43, and the guide shaft 441 is disposed on the threaded plate 44. The guide shaft 441 is slidably connected to the guide groove 431, and multiple sets of guide shafts 441 are provided. The guide groove 431 is spirally distributed. One end of the adjusting shaft 42 passes through the adjusting cylinder 41 and is located inside the fixed cylinder 43. The threaded plate 44 is located inside the fixed cylinder 43.

[0033] The first magnetic component is a permanent magnet 45, and the second magnetic component is an electromagnetic coil 46. The electromagnetic coil 46 is electrically connected to the control system. A return spring is connected between the threaded plate 44 and the fixed cylinder 43. Both the adjusting cylinder 41 and the fixed cylinder 43 are made of magnetic shielding material. The return spring resets the threaded plate 44, ensuring that the threaded plate 44 returns to the set position after the electromagnetic coil 46 is de-energized. A displacement sensor is installed on the fixed cylinder 43 to detect the movement distance of the threaded plate 44. The control system calculates the angle of the adjusting cylinder 41 based on this movement distance.

[0034] By controlling the energizing direction of the electromagnetic coil 46, i.e., by applying a positive or reverse current, the adjusting cylinder 41 can be driven to rotate, thereby adjusting the angle of the adjusting cylinder 41.

[0035] When a positive current is applied to the electromagnetic coil 46, the electromagnetic coil 46 generates a positive magnetic field. The positive magnetic field of the electromagnetic coil 46 and the magnetic field of the permanent magnet 45 repel each other. Under the action of the repulsive force, the permanent magnet 45 drives the threaded plate 44 away from the electromagnetic coil 46. Since the threaded plate 44 and the fixed cylinder 43 are connected by a guide assembly, the threaded plate 44 drives the guide shaft 441 to slide in the guide groove 431. Therefore, the threaded plate 44 rotates in the positive direction during the movement. The threaded plate 44 drives the adjusting cylinder 41 to rotate in the positive direction by a certain angle through the adjusting shaft 42.

[0036] When a reverse current is applied to the electromagnetic coil 46, the electromagnetic coil 46 generates a reverse magnetic field. The reverse magnetic field of the electromagnetic coil 46 attracts the magnetic field of the permanent magnet 45. Under the influence of the attraction, the permanent magnet 45 drives the threaded plate 44 to approach the electromagnetic coil 46. Since the threaded plate 44 and the fixed cylinder 43 are connected by a guide assembly, the threaded plate 44 drives the guide shaft 441 to slide in the guide groove 431. Therefore, the threaded plate 44 rotates in the opposite direction during the movement. The threaded plate 44 drives the adjusting cylinder 41 to rotate in the opposite direction by a certain angle through the adjusting shaft 42.

[0037] The detection element 5 includes a detection cylinder 51, which is located on the outermost adjusting cylinder 41. A vision sensor 52 and an illumination lamp 53 are located on the outside of the detection cylinder 51. A spraying assembly is located inside the detection cylinder 51. The spraying assembly includes a drive motor 54, two sets of cams 55, and two sets of stretching membranes 56. The two sets of stretching membranes 56 are sequentially arranged on the inner wall of the detection cylinder 51. The stretching membranes 56 have several folds and are elastic. The drive motor 54 is located at the bottom of the detection cylinder 51. The two sets of cams 55 are respectively arranged on the output shaft of the drive motor 54 through a first one-way bearing (not shown in the figure) and a second one-way bearing (not shown in the figure). The first one-way bearing and the second one-way bearing are mirror images of each other.

[0038] The vision sensor 52 and the illumination lamp 53 work together to detect the detection position and feed the detection data back to the control system. The control system then determines whether there are any missed points at the detection position. In addition, the control system adjusts the industrial robotic arm 2, the multi-stage telescopic component 3 and the adjustment component 4 in real time based on the data from the vision sensor 52, so as to drive the detection element 5 through the narrow space to reach the set detection position.

[0039] The detection cylinder 51 facing the two sets of stretch membranes 56 is provided with a filling port and several spray nozzles. One-way valves are installed in the spray nozzles. Soap solution is placed between one set of stretch membranes 56 and the detection cylinder 51, and fluorescent detection solution is placed between the other set of stretch membranes 56 and the detection cylinder 51.

[0040] When it is necessary to add the test solution, the staff will remove the cap on the filling port and then add the test solution through the filling port.

[0041] When it is necessary to detect leaks in pipelines or tanks at specific locations, the staff will introduce high-pressure gas into the pipelines or tanks at that location to make the pipelines or tanks high-pressure, so as to facilitate the detection. The control system will move the detection element 5 to the location to be detected by the industrial robotic arm 2, the multi-stage telescopic component 3 and the adjustment component 4, so that several spray nozzles are facing the location to be detected.

[0042] At this time, the control system controls the drive motor 54 to work. The drive motor 54 rotates in the forward direction. The drive motor 54 drives the upper cam 55 to rotate a certain angle through the first one-way bearing. The protrusion on the upper cam 55 squeezes the upper stretching membrane 56, which increases the pressure of the soap solution in the upper stretching membrane 56. The soap solution is sprayed through several spray nozzles onto the position to be detected. The vision sensor 52 detects the detection position in real time. When bubbles appear at the detection position, the control system determines that the position is a leak point. When no bubbles appear at the detection position, the control system determines that there is no leak point at the detection position.

[0043] Staff can use fluorescent detection liquid for detection based on the actual testing situation. The control system controls the drive motor 54 to rotate in the opposite direction by a certain angle. The drive motor 54 drives the lower cam 55 to rotate by a certain angle through the second one-way bearing. The protrusion on the lower cam 55 squeezes the lower stretching membrane 56, increasing the pressure of the fluorescent detection liquid in the lower stretching membrane 56. The fluorescent detection liquid is sprayed onto the location to be tested through several spray nozzles. The lighting lamp 53 is switched to ultraviolet light mode to excite fluorescence, which makes it easier for the visual sensor 52 to capture tiny leak traces in dim environments. The visual sensor 52 then feeds the data back to the control system, which then determines whether there is a leak.

[0044] When the visual sensor 52 detects a leak using soap solution or fluorescent detection solution, a buzzer in the control system sounds to alert the staff.

[0045] The multi-stage telescopic assembly 3 includes multiple sets of telescopic cylinders 31 nested together, with a sliding seal connection between the multiple sets of telescopic cylinders 31. A telescopic spring is connected between two adjacent telescopic cylinders 31, and an air pump (not shown in the figure) is connected to the lowest telescopic cylinder 31 through a pipe. The air pump is mounted on the base 1.

[0046] When the air pump supplies air, the pressure in the chamber formed inside the multiple sets of telescopic cylinders 31 increases, pushing the multiple sets of telescopic cylinders 31 to extend outward, and the telescopic spring is stretched.

[0047] When the air pump exhausts air, multiple sets of telescopic cylinders 31 retract under the action of the telescopic spring. The air pump is equipped with a pressure sensor and the extension length is precisely controlled by the control system to ensure that the multi-stage telescopic assembly 3 drives the detection element 5 to reach the narrow detection position.

[0048] A cleaning cylinder 6 is also provided on the base 1, and a collection box 61 is installed below the cleaning cylinder 6. The collection box 61 is located on the base 1. A water storage chamber is provided inside the cleaning cylinder 6. Several brushes are provided inside the cleaning cylinder 6. The brushes are hollow and one end of the brushes is connected to the water storage chamber. The water storage chamber is connected to an external pumping system (not shown in the figure) through a pipe.

[0049] After the test is completed, the industrial robotic arm 2 moves the detection element 5 into the cleaning cylinder 6. The industrial robotic arm 2 drives the detection element 5 to move up and down in the cleaning cylinder 6. The pumping system supplies liquid to the water storage chamber. The liquid flows out through the brush. The brush and the liquid clean the oil stains on the surface of the detection element 5 at the same time. The wastewater flows into the collection tank 61 for treatment.

[0050] Working principle: The control system controls the industrial robotic arm 2 and the multi-stage telescopic assembly 3 to work together. The air pump supplies air to the multi-stage telescopic assembly 3. The multiple sets of telescopic cylinders 31 in the multi-stage telescopic assembly 3 gradually extend. The multiple sets of telescopic cylinders 31 push the adjustment assembly 4 and the detection element 5 to move, sending the detection element 5 into the narrow space.

[0051] During the movement of the detection element 5, the adjustment component 4 controls the energizing direction of the electromagnetic coil 46 and uses magnetic force to drive the threaded plate 44 that cooperates with the spiral guide groove 431, thereby precisely adjusting the angle of each adjustment cylinder 41, so that the detection element 5 can flexibly bypass obstacles and finally reach the target detection position.

[0052] When the detection element 5 reaches the target detection position, and with high-pressure gas pre-introduced into the pipeline or oil tank to be tested, the detection element 5 will start working:

[0053] If the staff selects the soap liquid detection method, the drive motor 54 rotates forward, and the cam 55 squeezes the stretching membrane 56 storing soap liquid, spraying the soap liquid onto the surface to be tested. The vision sensor 52 monitors in real time whether bubbles are generated.

[0054] If the staff selects the fluorescence detection method, the drive motor 54 reverses and squeezes another set of stretch membranes 56 storing fluorescent liquid for spraying. At the same time, the lighting lamp 53 switches to ultraviolet light mode, and the vision sensor 52 captures fluorescent traces to identify the leak. Once the vision sensor 52 confirms the existence of the leak, the control system immediately triggers the buzzer alarm.

[0055] After the test is completed, the industrial robotic arm 2 moves the test element 5 into the cleaning cylinder 6. The pumping system supplies liquid and works with the hollow brush to automatically clean the test element 5. The wastewater generated is collected in the collection tank 61, and the entire device is ready for the next test.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for detecting oil leaks in confined spaces, characterized in that: Includes a base (1), on which an industrial robotic arm (2) is provided, the end of which is connected to a multi-stage telescopic assembly (3), the end of which is connected to an adjustment assembly (4), and the adjustment assembly (4) is provided with a detection element (5). The adjustment assembly (4) includes several adjustment cylinders (41), and a fixed cylinder (43) is provided on the adjustment cylinder (41). Two adjacent adjustment cylinders (41) are rotatably connected by an adjustment shaft (42). A threaded plate (44) is provided on the adjustment shaft (42), and the threaded plate (44) is connected to the fixed cylinder (43) by a guide assembly. The threaded plate (44) is provided with a first magnetic component, and the fixed cylinder (43) is provided with a second magnetic component; The guide assembly includes a guide shaft (441) and a guide groove (431). The guide groove (431) is disposed on the inner wall of the fixed cylinder (43), and the guide shaft (441) is disposed on the threaded plate (44). The guide shaft (441) is slidably connected to the guide groove (431), and multiple sets of the guide shaft (441) are provided. The guide groove (431) is spirally distributed, one end of the adjusting shaft (42) extends out of the adjusting cylinder (41) and is located inside the fixed cylinder (43), and the threaded plate (44) is located inside the fixed cylinder (43); The first magnetic component is a permanent magnet (45), the second magnetic component is an electromagnetic coil (46), the electromagnetic coil (46) is electrically connected to the control system, a reset spring is connected between the threaded plate (44) and the fixed cylinder (43), the adjusting cylinder (41) and the fixed cylinder (43) are both made of magnetic shielding material, and a displacement sensor is provided on the fixed cylinder (43).

2. The oil leak detection device suitable for confined spaces according to claim 1, characterized in that: The detection element (5) includes a detection cylinder (51), which is located on the outermost adjusting cylinder (41). A visual sensor (52) and a lighting lamp (53) are provided on the outside of the detection cylinder (51), and a spraying assembly is provided inside the detection cylinder (51).

3. The oil leak detection device suitable for confined spaces according to claim 2, characterized in that: The spraying assembly includes a drive motor (54), two sets of cams (55) and two sets of stretching membranes (56). The two sets of stretching membranes (56) are sequentially arranged on the inner wall of the detection cylinder (51). The stretching membranes (56) have several folds and are elastic. The drive motor (54) is located at the bottom of the detection cylinder (51). The two sets of cams (55) are respectively arranged on the output shaft of the drive motor (54) through a first one-way bearing and a second one-way bearing. The first one-way bearing and the second one-way bearing are mirror images of each other.

4. The oil leak detection device suitable for confined spaces according to claim 3, characterized in that: The detection cylinder (51) facing the two sets of stretch membranes (56) is provided with an injection port and several spray ports. One-way valves are provided in the several spray ports. Soap solution is provided between one set of stretch membranes (56) and the detection cylinder (51), and fluorescent detection solution is provided between the other set of stretch membranes (56) and the detection cylinder (51).

5. The oil leak detection device suitable for confined spaces according to claim 1, characterized in that: The multi-stage telescopic assembly (3) includes multiple sets of telescopic cylinders (31) nested together. The multiple sets of telescopic cylinders (31) form a sliding seal connection. A telescopic spring is connected between two adjacent telescopic cylinders (31). The lowest telescopic cylinder (31) is connected to an air pump through a pipe. The air pump is mounted on the base (1).

6. The oil leak detection device suitable for confined spaces according to claim 1, characterized in that: A cleaning cylinder (6) is also provided on the base (1). A collection box (61) is installed below the cleaning cylinder (6). The collection box (61) is located on the base (1). A water storage chamber is provided inside the cleaning cylinder (6). Several brushes are provided inside the cleaning cylinder (6). The brushes are hollow. One end of the brush is connected to the water storage chamber. The water storage chamber is connected to an external pumping system through a pipe.

7. The oil leak detection device suitable for confined spaces according to claim 1, characterized in that: A control box is provided on the base (1), and a control system is provided inside the control box.

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