An automatic cleaning device and method for tension bolts of nuclear-grade containers

Abstract

This invention relates to the field of electromechanical equipment technology, and in particular to an automatic cleaning device and method for tension bolts of nuclear-grade containers. The device includes a support platform, a cleaning mechanism, and a cleaning agent circulation mechanism. The support platform is a double-layered cuboid frame structure, with an upper frame and a lower frame. The cleaning agent circulation mechanism includes a collection tank, a circulation pump, a filter, a supply tank, and a cleaning agent spray head. The collection tank is connected to the circulation pump, filter, supply tank, and cleaning agent spray head sequentially via pipes. The collection tank is located on the upper frame, and the cleaning mechanism is located inside the collection tank. The cleaning mechanism is used to clean the tension bolts, and the cleaning agent spray head is located at the upper end of the cleaning mechanism. The supply tank is located on the lower frame. This device, by replacing manual cleaning with a cleaning mechanism, reduces the workload of multiple people to one person, thereby significantly reducing the overall workload and saving human resources.

Description

Technical Field

[0001] This invention relates to the field of electromechanical equipment technology, specifically to an automatic cleaning device and method for tension bolts of nuclear-grade containers. Background Technology

[0002] During a nuclear power plant overhaul, manhole inspections are required for nuclear-grade containers such as evaporators, pressurizers, boron injection tanks, and safety injection tanks. Consequently, hundreds of tension bolts need to be cleaned to remove residual anti-seize agent and other debris from the thread surfaces.

[0003] In existing technology, the tension bolts of nuclear-grade vessels are cleaned manually. The specific process involves first immersing the bolts in a stainless steel cleaning tank for ten minutes, then having multiple people use copper brushes to clean the threads, and finally returning the bolts to a bolt storage box. This method has the following disadvantages: 1. Bolt cleaning is carried out in a self-made stainless steel cleaning tank, which is open. Due to the strong corrosiveness of the cleaning agent, cleaning personnel often experience eye and respiratory irritation. Furthermore, the protective equipment used by the cleaning personnel after use becomes radioactive solid waste that needs to be disposed of. 2. Each major overhaul requires cleaning a large number of tension bolts, and the large amount of cleaning agent used cannot be effectively collected and filtered, resulting in low efficiency in reusing the cleaning agent and generating a large amount of radioactive waste liquid. 3. The handheld copper brushes used by maintenance personnel cause cleaning agent splashing, resulting in loose environmental pollution. 4. There is a risk of thread damage during the cleaning of tension bolts. The transfer, disassembly, and wiping of bolts and nuts all require a considerable amount of time. Due to the large number of bolts to be cleaned, a large number of manpower is needed, resulting in low efficiency. Summary of the Invention

[0004] This invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers, which solves the problem that manual cleaning of tension bolts of nuclear-grade containers requires a large amount of manpower, resulting in pollution and waste of cleaning agents.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes an automatic cleaning device for tension bolts of nuclear-grade containers. The device includes a support platform, a cleaning mechanism, and a cleaning agent circulation mechanism. The support platform is a double-layered cuboid frame structure, with an upper frame and a lower frame. The cleaning agent circulation mechanism includes a collection tank, a circulation pump, a filter, a supply tank, and a cleaning agent spray head. The collection tank is connected to the circulation pump, filter, supply tank, and cleaning agent spray head in sequence via pipes. The collection tank is located on the upper frame, and the cleaning mechanism is located inside the collection tank. The cleaning mechanism is used to clean the tension bolts, and the cleaning agent spray head is located at the upper end of the cleaning mechanism. The supply tank is located on the lower frame. The cleaning mechanism supports the tension bolts by placing them between the rotating cylinder and the bracket. The bracket is mounted on the support plate and can accommodate tension bolts of different diameters through different installation methods with the support plate. A roller is provided on the side of the bracket that contacts the tension bolt. The cleaning mechanism includes a base, a brushing component, a rotating component, a support plate, a bracket, and a feeding component. The base is installed at the bottom of the sealed cleaning tank. A slide rail is provided at the upper end of the base, and the rotating component is mounted on the slide rail. A brushing component is located on one side of the rotating component, and a feeding component is located on the other side. The support plate is fixedly connected to the side of the rotating component with the brushing component. The bracket is located at the upper end of the support plate. The feeding component includes a support frame, a threaded rod, and a handwheel. The support frame is fixed to the base, and the threaded rod passes through the support frame. A handwheel is located at one end of the threaded rod, and the other end of the threaded rod is connected to the rotating component. The threaded rod passes through the outer wall of the liquid collection tank, and the handwheel is located outside the liquid collection tank. The contact point between the liquid collection tank and the threaded rod is sealed.

[0007] In some embodiments, the bottom of the support platform is provided with wheels and a movable support, the movable support being a movable foot, the top of the movable foot being provided with a screw, the movable support being connected to the bottom of the support platform by threads, and the height of the movable foot being changed by rotating the screw.

[0008] In some embodiments, the liquid receiving tank has a double-layer structure, with the upper layer being a sealed cleaning tank and the lower layer being a waste liquid tank. The sealed cleaning tank is equipped with a cleaning mechanism, and a lid is provided at the top of the sealed cleaning tank. A sealing strip is embedded at the interface between the lid and the sealed cleaning tank, and the lid is provided with a glass window made of corrosion-resistant plexiglass material. The liquid supply tank is located directly below the liquid receiving tank, and a filter is provided between the liquid supply tank and the liquid receiving tank. The device has a height of less than 1000mm, a length of less than 900mm, and a width of less than 600mm.

[0009] In some embodiments, the bottom of the sealed cleaning tank of the liquid collection tank is provided with a sealing interface, and the cleaning agent enters the waste liquid tank in the lower layer of the liquid collection tank through the sealing interface; the support platform is made of stainless steel, and the liquid supply tank has a capacity of 25-30L.

[0010] In some embodiments, the rotating component includes a rotating cylinder, a rotating cylinder base, and a slider. The rotating cylinder base is located at the lower end of the rotating cylinder, and the slider is located at the lower end of the rotating cylinder base. The slider cooperates with the slide rail of the base. The rotating cylinder is covered with rubber. The tension bolt is placed between the bracket and the rotating cylinder. The rotation of the rotating cylinder drives the rotation of the tension bolt. The rotation speed of the tension bolt is adjustable in the range of 0 to 1000 rpm.

[0011] In some embodiments, the bracket adopts an L-shaped design. The bracket includes a stop block, a screw, a support rod, rollers, a vertical plate and a horizontal base plate. The horizontal base plate is provided at the lower end of the vertical plate, and the stop blocks are provided on both sides of the vertical plate. The vertical plate and the stop blocks are connected by screws. The horizontal support rod is provided at the top of the vertical plate, and several rollers are provided on the support rod. Four axisymmetric threaded holes are provided at the four corners of the horizontal base plate for connecting with the bracket.

[0012] In some embodiments, the tray is provided with several sets of threaded holes at different positions, with four threaded holes in each set. The positions of the threaded holes correspond to the positions of the threaded holes on the bracket. The transverse base plate of the bracket is installed on different sets of threaded holes on the tray to change the distance between the bracket and the rotating cylinder and to accommodate tension bolts of different diameters. The transverse base plate of the bracket is installed on the tray in two ways: facing the rotating cylinder and facing the cleaning brush component, to accommodate tension bolts of two different diameters. The dimensions of the vertical plate and the transverse base plate of the bracket are adjusted according to the diameter of the tension bolts. The tray is provided with multiple sets of threaded holes adapted to brackets of different sizes according to the position of the threaded holes on the transverse base plate of the bracket.

[0013] In some embodiments, the cleaning brush component includes a brush barrel and a brush blade. The brush blade is detachably mounted on the outer surface of the brush barrel and has a radially retractable function. The brush barrel drives the brush blade to rotate. The rotating cylinder and the cleaning brush component rotate in the same direction. The rotation speed of the cleaning brush component is higher than that of the rotating cylinder. A cleaning agent spray head is fixedly installed on the top of the cleaning brush component.

[0014] In some embodiments, the device further includes a power mechanism, which comprises a feed motor and a cleaning motor. The feed motor is connected to a rotating drum and controls the rotation of the rotating drum. The cleaning motor is connected to a brush drum and controls the rotation of the brush drum. The device also includes a control system, which is located inside a control box mounted on the lower frame of the support platform. The control system includes a human-machine interface (HMI), a programmable logic controller (PLC), two motor drivers, and a relay. The HMI is connected to the PLC, which in turn is connected to the two motor drivers and the relay. The two motor drivers are connected to the feed motor and the cleaning motor respectively via motor wires and encoder wires. The HMI controls the feed motor and the cleaning motor respectively through the two motor drivers. The relay is connected to a circulation pump, and the HMI controls the circulation pump through the relay.

[0015] This invention proposes an automatic cleaning method for tension bolts of nuclear-grade containers, the method comprising:

[0016] Step 1: Move the device to the work area using the wheels, and rotate the movable support device to lift the wheels off the ground;

[0017] Step 2: Pour cleaning agent into the collection tank, select the bracket and its installation position on the tray according to the specifications of the cleaning bolts, and install the bracket on the tray.

[0018] Step 3: Place the tension bolt between the bracket and the rotating cylinder, close the cover of the liquid collection tank, and use the control system to start the feed motor and the cleaning motor. The feed motor and the cleaning motor drive the cleaning brush component and the rotating component to rotate.

[0019] Step 4: Manually rotate the handwheel of the feed component to make the tension bolt contact the brush blade of the cleaning brush component. Select the appropriate feed amount of the feed component according to the degree of dirt on the tension bolt.

[0020] Step 5: Use the control system to start the circulation pump. The circulation pump will spray the cleaning agent from the cleaning agent spray head. Observe the cleanliness of the tension bolts through the plexiglass cover.

[0021] Step 6: After cleaning the tension bolt, manually rotate the handwheel of the feed component in the opposite direction to move the tension bolt away from the cleaning brush component. Use the control system to turn off the feed motor, circulation pump and cleaning motor, open the cover of the liquid collection tank and take out the tension bolt.

[0022] The implementation of this invention has the following beneficial effects:

[0023] 1. This invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers. This device replaces manual cleaning with a cleaning mechanism, reducing the workload of 7 to 8 people to 1 person, thereby significantly reducing the overall risk and saving human resources. The device is small in size, its dimensions are small enough to fit into the smallest elevator in the nuclear island plant, it is lightweight, and it has wheels for easy transport within the nuclear island plant.

[0024] 2. The present invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers. The device is equipped with a sealed liquid collection tank and a designed tank cover, so that the cleaning process of tension bolts is carried out in a sealed chamber, which reduces the spillage of cleaning agent and the spread of loose contaminants.

[0025] 3. The present invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers. The device is supported by a rotating cylinder and a bracket, and can meet the cleaning needs of bolts of various sizes from M24 to M68 through different installation methods.

[0026] 4. This invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers. The device incorporates a cleaning agent circulation mechanism, enabling the cleaning agent to be recycled, significantly reducing the amount of cleaning agent used and minimizing waste discharge. The device also features a separate cleaning mechanism for each bolt, preventing damage from collisions when multiple bolts are immersed.

[0027] 5. The present invention provides an automatic cleaning device and method for tension bolts of nuclear-grade containers. The device is controlled by a PLC for cleaning, uses a high-safety-factor motor, and is fully functional, safe and reliable, easy to operate and maintain. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an automatic cleaning device for tension bolts of a nuclear-grade container according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the cleaning mechanism of an automatic cleaning device for tension bolts of nuclear-grade containers according to an embodiment of the present invention;

[0030] Figure 3 This is a front view of the bracket of an automatic cleaning device for tension bolts of nuclear-grade containers according to an embodiment of the present invention;

[0031] Figure 4 This is a left view of the bracket of an automatic cleaning device for tension bolts of nuclear-grade containers according to an embodiment of the present invention;

[0032] Figure 5 This is a schematic diagram of the threaded hole of the tray of an automatic cleaning device for tension bolts of nuclear-grade containers according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the cleaning agent circulation mechanism of an automatic cleaning device for tension bolts of nuclear-grade containers according to an embodiment of the present invention;

[0034] Attached diagram descriptions: 1. Tank cover; 2. Cleaning mechanism; 3. Liquid collection tank; 4. Liquid supply tank; 5. Control box; 6. Movable support; 7. Wheels; 8. Filter; 9. Circulation pump; 10. Cleaning agent spray head; 21. Feeding component; 22. Rotating cylinder; 23. Tension bolt; 24. Bracket; 25. Cleaning brush component; 26. Support plate; 241. Stop block; 242. Bracket; 243. Roller. Detailed Implementation

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. 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.

[0036] like Figures 1 to 6 As shown, this invention proposes an automatic cleaning device for tension bolts of nuclear-grade containers. The device includes a support platform, a cleaning mechanism 2, a power mechanism, a cleaning agent circulation mechanism, and a control system. The device is less than 1000mm high, less than 900mm long, and less than 600mm wide, exhibiting a compact structure and small size.

[0037] The support platform serves as the mounting reference platform for all components. Its optimized design is primarily based on ease of use, practical site limitations, and environmental requirements. For example... Figure 1 As shown, due to strict requirements on the equipment's floor space, the support platform adopts a double-layer rectangular frame structure, consisting of an upper and lower frame. The upper frame houses the liquid receiving tank 3, which contains the cleaning agent circulation mechanism. The lower frame houses the liquid supply tank 4, which also contains the cleaning agent circulation mechanism, and a control box 5, which includes the control mechanism. The liquid supply tank 4 is located directly below the liquid receiving tank 3, and a filter 8 for the cleaning agent circulation mechanism is located between the liquid supply tank 4 and the liquid receiving tank 3. The bottom of the support platform is equipped with wheels 7 and movable supports 6. The movable supports 6 are movable feet located at the four corners of the bottom of the support platform. Each movable foot has a screw at its top, and the movable feet are connected to the bottom of the support platform via threads. The height of the movable feet can be adjusted by rotating the screws. Due to the high humidity at the site and the corrosive nature of the cleaning agent used, the support platform is made of 304 stainless steel. This material is beneficial for the equipment's corrosion resistance and also facilitates cleaning. This device adopts a double-layer structure, which greatly saves the floor space of the equipment. At the same time, the platform can receive and return the cleaning agent in the liquid receiving tank 3. After filtration, the cleaning agent flows back into the liquid supply tank 4 for recycling, effectively preventing the cleaning agent from flowing out and polluting the equipment and site.

[0038] To effectively utilize the cleaning agent and reduce wastewater discharge, the cleaning agent in the equipment can be recycled to a certain extent; therefore, this device is equipped with a cleaning agent circulation mechanism. For example... Figure 6 As shown, the cleaning agent circulation mechanism mainly realizes the functions of supplying, spraying, and filtering the cleaning agent for recycling. The cleaning agent circulation mechanism mainly consists of a liquid collection tank 3, a circulation pump 9, a filter 8, a liquid supply tank 4, and a cleaning agent spray head 10. The liquid collection tank 3 is connected to the filter 8 through a pipe, the filter 8 is connected to the liquid supply tank 4 through a pipe, the liquid supply tank 4 is connected to the circulation pump 9 through a pipe, and the circulation pump 9 is connected to the cleaning agent spray head 10 through a pipe. The cleaning mechanism 2 is installed inside the liquid collection tank 3, and the cleaning agent spray head 10 is located on the upper part of the cleaning mechanism 2.

[0039] The receiving tank 3 has a double-layer structure: an upper sealed cleaning tank and a lower waste liquid tank. The sealed cleaning tank contains a cleaning mechanism 2, and a cover 1 is located at the top. A sealing strip is embedded between the cover 1 and the interface of the sealed cleaning tank, effectively sealing the tank and preventing cleaning fluid evaporation from contaminating the factory during the cleaning process. The cover 1 has a glass window, allowing operators to observe the tension bolts 23 being cleaned and assess the machine's operation. The glass window is made of corrosion-resistant acrylic glass, enhancing its corrosion resistance and mechanical strength. A sealing interface is located at the bottom of the sealed cleaning tank, through which waste liquid is discharged from the tank into the waste liquid tank. The cleaning agent in the receiving tank 3 is filtered through a pipe into a filter 8 and then flows into the supply tank 4. A circulation pump 9 delivers the cleaning agent from the supply tank 4 to the cleaning agent spray head 10, thus achieving the recycling of the cleaning agent. The amount of cleaning agent used can be determined according to actual needs. The supply tank 4 has a capacity of approximately 26L, sufficient for cleaning multiple bolts at once. The cleaning agent can be continuously recycled. When the cleaning agent in the liquid collection tank 3 is insufficient, it needs to be replenished or replaced manually.

[0040] like Figure 2 As shown, the cleaning mechanism 2 includes a base, a cleaning brush component 25, a rotating component, a bracket 24, and a feeding component 21. The base is installed at the bottom of the sealed cleaning box. A slide rail is provided at the upper end of the base, and a rotating component is provided on the slide rail. The cleaning brush component 25 is provided on one side of the rotating component, and the feeding component 21 is provided on the other side of the rotating component. A bracket 26 is fixedly connected to the side of the rotating component where the cleaning brush component 25 is located. A bracket 24 is provided at the upper end of the bracket 26.

[0041] The feeding component 21 includes a support frame, a threaded rod, and a handwheel. The support frame is fixed to the base, the threaded rod passes through the support frame, one end of the threaded rod is equipped with a handwheel, and the other end of the threaded rod is connected to the rotating component. The threaded rod passes through the outer wall of the liquid collection tank 3, and the handwheel is located on the outside of the liquid collection tank 3. The contact point between the liquid collection tank 3 and the threaded rod is sealed. The feeding component 21 mainly feeds the rotating component, which can slide on a slide rail. The position of the rotating component is controlled by rotating the handwheel, thereby adjusting the position between the bolt and the cleaning brush, and thus adjusting the contact force between the bolt and the cleaning brush.

[0042] The rotating component includes a rotating cylinder 22, a rotating cylinder base, and a slider. The rotating cylinder 22 is powered by a motor and rotates. The rotating cylinder base is located at the lower end of the rotating cylinder 22, and the slider is located at the lower end of the rotating cylinder base, cooperating with the slide rail of the base. The exterior of the rotating cylinder 22 is coated with rubber to enhance its surface friction coefficient. The tension bolt 23 is placed between the bracket 24 and the rotating cylinder 22. The rotation of the rotating cylinder 22 drives the bolt to rotate slowly, thereby cleaning all surfaces of the bolt. The rotation speed of the tension bolt 23 can be flexibly adjusted within the range of 0 to 1000 rpm.

[0043] like Figure 3 and Figure 4 As shown, to accommodate different bolt thread sizes, the position of the bracket 24 relative to the rotating component is used. This allows the cleaning machine to replace only one bracket 24 when cleaning different bolts. This bolt cleaning device is suitable for bolts with diameters ranging from 24mm to 68mm, specifically 24mm, 27mm, 33mm, 36mm, 48mm, and 68mm. For ease of operation, two specifications of bracket 24 are designed, each with two installation methods to meet the support requirements of the various bolt sizes mentioned above. The bracket 24 adopts an L-shaped design, consisting of a vertical plate and a horizontal base plate. Stops 241 are provided on both sides of the vertical plate, and the vertical plate and stops 241 are connected by screws. A horizontal support 242 is provided at the top of the vertical plate, and several rollers are mounted on the support 242. When the tension bolt 23 is placed at the top of the bracket 24, the roller contacts the tension bolt 23. As the tension bolt 23 rotates with the rotating cylinder 22, the roller is used to reduce the friction between the tension bolt 23 and the bracket 24 to prevent thread scratches.

[0044] like Figure 4 and Figure 5 As shown, the four corners of the transverse base plate are provided with four axially symmetrical threaded holes, which are used to connect with the support plate 26. The support plate 26 has several sets of threaded holes at different positions, with four threaded holes in each set. The positions correspond to the positions of the threaded holes on the bracket 24. By installing the transverse base plate of the bracket 24 on different sets of threaded holes on the support plate 26, the distance between the bracket 24 and the rotating cylinder 22 is changed, thereby adapting to tension bolts 23 of different diameters. At the same time, due to the symmetrical design of the threaded holes on the transverse base plate, the bracket 24 also has two assembly methods: the transverse base plate faces the rotating component or the transverse base plate faces the cleaning brush component 25. For the six specifications of bolts of 24mm, 27mm, 33mm, 36mm, 48mm, and 68mm, two bracket 24 structures were designed. In one bracket 24, the distance between the two threaded holes on the transverse base plate (i.e., the distance between the two threaded holes on the side closer to the vertical plate and the two threaded holes on the side farther from the vertical plate) is 3mm. Figure 5 As shown, in Figure 5The diagram shows two sets of threaded holes on the support plate 26. One set of threaded holes is hollow, while the other set is marked with a cross. The left side of the diagram faces the rotating cylinder 22, and the right side faces the cleaning brush component 25. When the horizontal base plate of the bracket 24 is installed in the hollow set of threaded holes on the support plate 26, the vertical plate of the bracket 24 is positioned to accommodate a 27mm diameter tension bolt 23. When the horizontal base plate is rotated 180 degrees and positioned to face the cleaning brush component 25, it is installed in the hollow set of threaded holes on the support plate 26. In this case, the vertical plate of the bracket 24 is positioned to accommodate a 24mm diameter tension bolt 23. Similarly, when the horizontal base plate of the bracket 24 is installed in a set of threaded holes with a cross at the center of the bracket 26 in the figure, facing the rotating cylinder 22, the vertical plate of the bracket 24 is matched with a tension bolt 23 with a diameter of 36mm. When the horizontal base plate is rotated 180 degrees and faces the cleaning brush component 25, it is installed in a set of threaded holes with a cross at the center of the bracket 26. At this time, the vertical plate of the bracket 24 is matched with a tension bolt 23 with a diameter of 33mm.

[0045] Another type of bracket 24 has a horizontal base plate with two threaded holes spaced 20mm apart (i.e., the distance between the two threaded holes on the side closer to the vertical plate and the two threaded holes on the side farther from the vertical plate). This type of bracket 24 is installed in a set of threaded holes designed in another bracket plate 26, and can be fitted with tension bolts 23 with diameters of 48mm and 68mm through the above two installation methods.

[0046] The cleaning brush assembly 25 consists of a brush barrel and detachable brush blades. The brush blades are detachably mounted on the outer surface of the brush barrel. The brush barrel is driven by a high-power cleaning motor to rotate the brush blades at high speed, thus achieving the cleaning function of the bolts. The rotating cylinder 22 rotates in the same direction as the cleaning brush assembly 25. The cleaning brush assembly 25 rotates at high speed, with an adjustable speed range of 0-1500 r / min, while the rotating cylinder 22 rotates at low speed, with an adjustable speed range of 0-75 r / min. To ensure a stable cleaning effect, the cleaning brush blades can move within a certain range in the radial direction. This ensures the contact force between the cleaning brush and the bolt threads and also accommodates the cleaning of threads of different diameters. The cleaning agent spray head 10 is fixed together with the cleaning brush assembly 25 and is positioned above the brush blades. During cleaning, the cleaning agent spray head 10 sprays liquid onto the thread surface.

[0047] The power mechanism includes a feed motor and a cleaning motor. The feed motor is connected to the rotating drum 22 and controls its rotation. The cleaning motor is connected to the brush drum and controls its rotation. Since the required motor power is not large, AC servo motors are selected. AC servo technology itself borrows from and applies frequency conversion technology, integrating the frequency conversion stage with the driver. The servo driver's current loop, speed loop, and position loop (frequency converters do not have a position loop) employ more precise control technology and algorithm calculations than general frequency converters, resulting in significantly more powerful functionality. Based on the transmission relationships and load conditions of each transmission mechanism, and after calculating the load torque to the motor shaft using relevant formulas, and considering a safety factor of 3, the motors are selected. Below are the motors selected for each mechanism after calculation: the feed motor is a Huichuan AC servo motor MS1H3-85B15CB; the drive motor is a Huichuan AC servo motor MS1H1-10B30CB.

[0048] like Figure 6 As shown, the control system is located inside control box 5. The control system adopts a distributed control system with a programmable logic controller (PLC) and an industrial control computer as its core. The control system uses a human-machine interface (HMI) to connect to the PLC. The PLC connects to two motor drivers and one relay. The two motor drivers are connected to the feed motor and the cleaning motor respectively through motor lines and encoder lines. The motor drivers use CAN field control bus technology, Ethernet communication technology and SSCNET network technology for servo motor control to control the feed motor and the cleaning motor. The relay connects to the circulation pump 9, thereby controlling the circulation pump 9. Through the adoption of these technologies, the final developed product has the characteristics of complete functions, safety and reliability, convenient operation, easy maintenance and easy function expansion. See the control system structure diagram for details.

[0049] This invention proposes an automatic cleaning method for tension bolts of nuclear-grade containers, the method comprising:

[0050] Step 1: Move the device to the work area using the wheels 7, and rotate the movable support 6 to support the device, so that the wheels 7 are off the ground, thereby improving the stability of the equipment;

[0051] Step 2: Pour 20L of cleaning agent into the liquid collection tank 3, and select the specifications of bracket 24 and the installation position of tray 26 according to the specifications of the cleaning bolts;

[0052] Step 3: Place the tension bolt 23 between the bracket 24 and the rotating cylinder 22, close the cover 1 of the liquid collection tank 3, and use the control system to start the feed motor and the cleaning motor. The feed motor and the cleaning motor drive the cleaning brush component 25 and the rotating component to rotate.

[0053] Step 4: Manually rotate the handwheel of the feed component 21 to make the tension bolt 23 contact the brush blade of the cleaning brush component 25. Select the appropriate feed amount of the feed component 21 according to the degree of dirt on the tension bolt 23.

[0054] Step 5: Use the control system to start the circulation pump 9. The circulation pump 9 sprays the cleaning agent from the cleaning agent spray head 10. Observe the cleanliness of the tension bolt 23 through the plexiglass of the box cover 1.

[0055] Step 6: After cleaning the tension bolt 23, manually rotate the handwheel of the feed component 21 in the opposite direction to move the tension bolt 23 away from the cleaning brush component 25. Use the control system to turn off the feed motor, circulation pump 9 and cleaning motor, open the cover 1 of the liquid collection tank 3 and take out the tension bolt 23.

[0056] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. An automatic cleaning device for tension bolts of nuclear-grade containers, characterized in that, The device includes a support platform, a cleaning mechanism (2), and a cleaning agent circulation mechanism. The support platform is a double-layered rectangular frame structure, with an upper frame and a lower frame. The cleaning agent circulation mechanism includes a collection tank (3), a circulation pump (9), a filter (8), a supply tank (4), and a cleaning agent spray head (10). The collection tank (3) is connected to the circulation pump (9), the filter (8), the supply tank (4), and the cleaning agent spray head (10) in sequence via pipes. The collection tank (3) is located on the upper frame. The receiving tank (3) is equipped with a cleaning mechanism (2) for cleaning the tension bolt (23). The cleaning mechanism (2) is equipped with a cleaning agent spray head (10) at its upper end. The supply tank (4) is located on the lower frame. The cleaning mechanism (2) supports the tension bolt by placing it between the rotating cylinder (22) and the bracket (24). The bracket (24) is located on the support plate (26). The bracket (24) is installed in a different way than the support plate (26). The design is adapted to tension bolts (23) of different diameters; the bracket (24) has rollers on the side that contacts the tension bolt; the cleaning mechanism (2) includes a base, a brushing component, a rotating component, a tray (26), a bracket (24), and a feeding component (21). The base is installed at the bottom of the sealed cleaning tank. The upper end of the base is provided with a slide rail, and the rotating component is provided on the slide rail. A cleaning brush component (25) is provided on one side of the rotating component, and a feeding component (21) is provided on the other side of the rotating component. The rotating component is provided with a cleaning brush. A support plate (26) is fixedly connected to one side of the component (25). The support plate (26) is provided with the bracket (24) at the upper end. A feeding component (21) includes a support frame, a threaded rod and a handwheel. The support frame is fixed on the base. The threaded rod passes through the support frame. One end of the threaded rod is provided with a handwheel. The other end of the threaded rod is connected to a rotating component. The threaded rod passes through the outer wall of the liquid collection tank (3). The handwheel is located on the outside of the liquid collection tank (3). The contact position between the liquid collection tank (3) and the threaded rod is sealed.

2. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 1, characterized in that, The bottom of the support platform is provided with wheels (7) and movable support (6). The movable support (6) is a movable leg. The top of the movable leg is provided with a screw. The movable leg is connected to the bottom of the support platform by a thread. The height of the movable leg can be changed by rotating the screw.

3. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 1, characterized in that, The liquid collection tank (3) has a double-layer structure. The upper layer of the liquid collection tank (3) is a sealed cleaning tank, and the lower layer of the liquid collection tank (3) is a waste liquid tank. The sealed cleaning tank is equipped with a cleaning mechanism (2) inside. The top of the sealed cleaning tank is equipped with a cover (1). The interface between the cover (1) and the sealed cleaning tank is inlaid with a sealing strip. The cover (1) is equipped with a glass window. The glass window is made of corrosion-resistant organic glass material. The liquid supply tank (4) is located below the liquid collection tank (3). A filter (8) is provided between the liquid supply tank (4) and the liquid collection tank (3).

4. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 3, characterized in that, The bottom of the sealed cleaning tank of the liquid collection tank (3) is provided with a sealing interface, and the cleaning agent enters the waste liquid tank under the liquid collection tank (3) through the sealing interface; the support platform is made of stainless steel, and the liquid supply tank (4) has a capacity of 25-30L; the device is less than 1000mm high, less than 900mm long, and less than 600mm wide.

5. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 4, characterized in that, The rotating component includes a rotating cylinder (22), a rotating cylinder base, and a slider. The rotating cylinder (22) has a rotating cylinder base at its lower end, and the rotating cylinder base has a slider at its lower end. The slider cooperates with the slide rail of the base. The rotating cylinder is covered with rubber. The tension bolt (23) is placed between the bracket (24) and the rotating cylinder (22). The rotation of the rotating cylinder (22) drives the rotation of the tension bolt (23). The rotation speed of the tension bolt (23) is adjustable in the range of 0 to 1000 rpm / min.

6. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 5, characterized in that, The bracket (24) adopts an L-shaped design. The bracket (24) includes a stop block (241), screws, a bracket (242), rollers, a vertical plate and a horizontal base plate. The horizontal base plate is provided at the lower end of the vertical plate. The stop block (241) is provided on both sides of the vertical plate. The vertical plate and the stop block (241) are connected by screws. The top of the vertical plate is provided with a horizontal bracket (242) rod. Several rollers are provided on the bracket (242). Four axially symmetrical threaded holes are provided at the four corners of the horizontal base plate. The threaded holes are used to connect with the bracket (26).

7. An automatic cleaning device for tension bolts of a nuclear-grade container according to claim 6, characterized in that, The tray (26) has several sets of threaded holes at different positions, with four threaded holes in each set. The positions of the threaded holes correspond to the positions of the threaded holes on the bracket (24). The horizontal base plate of the bracket (24) is installed on different sets of threaded holes on the tray (26) to change the distance between the bracket (24) and the rotating cylinder (22) and to accommodate tension bolts (23) of different diameters. The horizontal base plate of the bracket (24) is installed on the tray (26) in two ways: facing the rotating cylinder (22) and facing the cleaning brush component (25), to accommodate tension bolts (23) of two different diameters. The dimensions of the vertical plate and the horizontal base plate of the bracket (24) are adjusted according to the diameter of the tension bolts (23). The tray (26) has multiple sets of threaded holes adapted to the different sizes of the bracket (24) according to the positions of the threaded holes on the horizontal base plate of the bracket (24).

8. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 7, characterized in that, The cleaning brush component (25) includes a brush cylinder and a brush blade. The brush blade is detachably mounted on the outer surface of the brush cylinder. The brush blade has a radially retractable function. The brush cylinder drives the brush blade to rotate. The rotating cylinder (22) rotates in the same direction as the cleaning brush component (25). The rotation speed of the cleaning brush component (25) is higher than that of the rotating cylinder (22). A cleaning agent spray head (10) is fixedly installed on the top of the cleaning brush component (25).

9. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 1, characterized in that, The device is also equipped with a power mechanism, which includes a feed motor and a cleaning motor. The feed motor is connected to a rotating cylinder (22) and controls the rotation of the rotating cylinder (22). The cleaning motor is connected to a brush cylinder and controls the rotation of the brush cylinder. The device is also equipped with a control system, which is located in a control box (5). The control box (5) is located on the lower frame of the support platform. The control system includes a human-machine interface, a programmable logic controller (PLC), two motor drivers, and a relay. The PLC is connected to the PLC, and the PLC is connected to the two motor drivers and the relay. The two motor drivers are connected to the feed motor and the cleaning motor respectively via motor wires and encoder wires. The PLC controls the feed motor and the cleaning motor respectively via the two motor drivers. The relay is connected to a circulation pump (9), and the PLC controls the circulation pump (9) via the relay.

10. An automatic cleaning method for an automatic cleaning device for tension bolts of nuclear-grade containers according to any one of claims 1-9, characterized in that, The method includes: Step 1: Move the device to the work area using the wheels (7), and rotate the movable support (6) to support the device so that the wheels (7) are away from the ground; Step 2: Pour cleaning agent into the liquid collection tank (3), select the bracket (24) and the installation position of the bracket (24) on the tray (26) according to the specifications of the cleaning bolt, and install the bracket (24) on the tray (26); Step 3: Place the tension bolt (23) between the bracket (24) and the rotating cylinder (22), close the cover (1) of the liquid collection tank (3), and use the control system to start the feed motor and the cleaning motor. The feed motor and the cleaning motor drive the cleaning brush component (25) and the rotating component to rotate. Step 4: Manually rotate the handwheel of the feed component (21) to make the tension bolt (23) contact the brush blade of the cleaning brush component (25), and select the feed amount of the feed component (21) according to the degree of dirtiness of the tension bolt (23); Step 5: Use the control system to start the circulation pump (9). The circulation pump (9) sprays the cleaning agent from the cleaning agent spray head (10). Observe the cleanliness of the tension bolts (23) through the plexiglass of the box cover (1). Step 6: After cleaning the tension bolt (23), manually rotate the handwheel of the feed component (21) in the opposite direction to move the tension bolt (23) away from the cleaning brush component (25), use the control system to turn off the feed motor, circulation pump (9) and cleaning motor, open the cover (1) of the liquid collection tank (3), and take out the tension bolt (23).

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