Automatic cleaning device and cleaning method for nuclear-grade container stretching bolt

Abstract

The invention relates to the technical field of electromechanical equipment, in particular to an automatic cleaning device and method for a nuclear-grade container stretching bolt, the device comprises a supporting table body, a cleaning mechanism and a cleaning agent circulating mechanism, the supporting table body is of a double-layer cuboid frame structure, and the supporting table body is provided with an upper-layer rack and a lower-layer rack; the cleaning agent circulating mechanism comprises a liquid collecting box, a circulating pump, a filter, a liquid supply box and a cleaning agent spraying head, the liquid collecting box is sequentially connected with the circulating pump, the filter, the liquid supply box and the cleaning agent spraying head through pipelines, the liquid collecting box is arranged on the upper-layer rack, a cleaning mechanism is arranged in the liquid collecting box, and the cleaning agent spraying head is arranged on the lower-layer rack. The cleaning mechanism is used for cleaning the stretching bolt, and the cleaning agent spraying head is arranged at the upper end of the cleaning mechanism; according to the device, the cleaning mechanism is arranged to replace manual cleaning, and the workload of multiple persons is reduced to one person, so that the collective dosage is greatly reduced, and human resources are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of electro-mechanical equipment, and specifically relates to an automatic cleaning device and cleaning method for nuclear-grade container tensile bolts. Background Art

[0002] During the major overhaul of nuclear power plants, manholes of nuclear-grade containers such as evaporators, pressurizers, boron injection tanks, and safety injection tanks need to be inspected. Accordingly, hundreds of tensile bolts need to be cleaned to remove the anti-seize agent and other debris remaining on the thread surface, and it is necessary to clean the nuclear-grade container tensile bolts.

[0003] In the prior art, the nuclear-grade container tensile bolts are manually cleaned. The specific process is to soak the bolts in a stainless-steel cleaning tank for ten minutes first, and then multiple people use copper brushes to clean the threads, and then put the bolts back into the bolt temporary storage box. The disadvantages of using this method are as follows: 1. The bolt cleaning is carried out in a self-made stainless-steel cleaning tank, and the cleaning tank is in an open state. Since the cleaning agent is highly corrosive, the eyes and respiratory tracts of the cleaning personnel often have discomfort reactions, and at the same time, the protective equipment of the cleaning personnel after use also becomes radioactive solid waste that needs to be treated; 2. A large number of tensile bolts need to be cleaned during each major overhaul, and the large amount of cleaning agent used cannot be effectively collected and filtered, resulting in low reuse efficiency of the cleaning agent and thus generating a large amount of radioactive waste liquid; 3. When the maintenance personnel use a handheld copper brush for cleaning, the cleaning agent splashes, causing loose pollution to the environment; 4. There is a risk of thread damage during the process of cleaning the tensile bolts. The transportation, disassembly, assembly, and wiping of the bolts and nuts all take a long time. Since the number of bolts to be cleaned is relatively large, a large amount of manpower needs to be arranged, resulting in low efficiency. Summary of the Invention

[0004] The present invention provides an automatic cleaning device and cleaning method for nuclear-grade container tensile bolts, which are used to solve the problems that manual cleaning of nuclear-grade container tensile bolts in the prior art requires a large amount of manpower, causes pollution, and wastes cleaning agent.

[0005] The technical solution of the present invention is as follows: The present invention proposes an automatic cleaning device for nuclear-grade container tensile bolts. The device includes a support platform body, a cleaning mechanism, and a cleaning agent circulation mechanism. The support platform body is a double-layer rectangular frame structure, and the support platform body is provided with an upper frame and a lower frame; the cleaning agent circulation mechanism includes a liquid collection tank, a circulation pump, a filter, a liquid supply tank, and a cleaning agent spraying head. The liquid collection tank is connected to the circulation pump, the filter, the liquid supply tank, and the cleaning agent spraying head in sequence through pipelines. The liquid collection tank is arranged on the upper frame, and the cleaning mechanism is arranged inside the liquid collection tank. The cleaning mechanism is used to clean the tensile bolts, and a cleaning agent spraying head is arranged at the upper end of the cleaning mechanism; the liquid supply tank is arranged on the lower frame.

[0006] In some embodiments, wheels and movable supports are provided at the bottom of the support platform. The movable support is a movable support leg. A screw rod is provided at the top of the movable support leg. The movable support is connected to the bottom of the support platform by threads. The height of the movable support leg is changed by rotating the screw rod.

[0007] In some embodiments, the inside of the liquid collection box has a double-layer structure. The upper layer of the liquid collection box is a sealed cleaning box, and the lower layer of the liquid collection box is a waste liquid box. A cleaning mechanism is provided inside the sealed cleaning box. A box cover is provided at the top of the sealed cleaning box. A sealing strip is inlaid at the interface between the box cover and the sealed cleaning box. The box cover is provided with a glass window, and the glass window is made of corrosion-resistant plexiglass material; the liquid supply box is arranged directly below the liquid collection box, and a filter is provided between the liquid supply box and the liquid collection box; the height of this device is less than 1000 mm, the length is less than 900 mm, and the width is less than 600 mm.

[0008] In some embodiments, a sealed interface is provided at the bottom of the sealed cleaning box of the liquid collection box, and the cleaning agent enters the waste liquid box in the lower layer of the liquid collection box through the sealed interface; the material of the support platform is selected as stainless steel, and the capacity of the liquid supply box is 25 - 30 L.

[0009] In some embodiments, the cleaning mechanism includes a base, a scrubbing component, a rotating component, a support plate, a bracket and a feeding component. The base is installed at the bottom of the sealed cleaning box. A slide rail is provided at the upper end of the base. The rotating component is provided on the slide rail. A cleaning brush assembly is provided on one side of the rotating component, and a feeding component is provided on the other side of the rotating component. A support plate is fixedly connected to the outside of the rotating component on the side where the cleaning brush assembly is provided. A bracket is provided 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 on the base. The threaded rod passes through the support frame. A handwheel is provided 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 box, and the handwheel is arranged outside the liquid collection box. The contact position between the liquid collection box and the threaded rod is sealed.

[0010] In some embodiments, the rotating component includes a rotating cylinder, a rotating cylinder base and a slider. The rotating cylinder base is provided at the lower end of the rotating cylinder. The slider is provided at the lower end of the rotating cylinder base. The slider cooperates with the slide rail of the base. The outside of 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 adjusted in the range of 0 - 1000 rpm.

[0011] In some embodiments, the bracket is designed in an L shape. The bracket includes a stop block, a screw, a support rod, a roller, a vertical plate and a horizontal bottom plate. The horizontal bottom plate is provided at the lower end of the vertical plate. Stop blocks are provided on both sides of the vertical plate. The vertical plate and the stop blocks are connected by screws. A horizontal support rod is provided at the top of the vertical plate, and several rollers are provided on the support rod; four axially symmetric threaded holes are provided at the four corners of the horizontal bottom plate, and the threaded holes are used to connect with the support plate.

[0012] In some embodiments, the pallet is provided with several groups of threaded holes at different positions. Each group of threaded holes has 4 holes. The positions of the threaded holes correspond to the positions of the threaded holes on the bracket. The horizontal bottom plate of the bracket is installed on different groups of threaded holes of the pallet to change the distance between the bracket and the rotating cylinder and adapt to stretching bolts of different diameters. The horizontal bottom plate of the bracket is installed on the pallet in two ways, facing the rotating cylinder and facing the cleaning brush mechanism, to adapt to two different diameters of stretching bolts. The bracket adjusts the dimensions of the vertical upright plate and the horizontal bottom plate according to the diameter of the stretching bolt. The pallet is provided with multiple groups of threaded holes adapted to the threaded holes of brackets of different sizes according to the positions of the threaded holes of the horizontal bottom plate of the bracket.

[0013] In some embodiments, the cleaning brush mechanism includes a brush cylinder and brush pieces. The brush pieces are detachably installed on the outer surface of the brush cylinder. The brush pieces have the function of radial expansion and contraction. The brush cylinder drives the brush pieces to rotate. The rotating cylinder and the cleaning brush mechanism rotate in the same direction, and the rotating speed of the cleaning brush mechanism is higher than that of the rotating cylinder. A cleaning agent spraying head is fixedly arranged at the top of the cleaning brush mechanism.

[0014] In some embodiments, the device is also provided with a power mechanism. The power mechanism includes a feeding motor and a cleaning motor. The feeding motor is connected to the rotating cylinder, and the feeding motor controls the rotation of the rotating cylinder. The cleaning motor is connected to the brush cylinder, and the cleaning motor controls the rotation of the brush cylinder. The device is also provided with a control system. The control system is arranged in a control box, and the control box is arranged on the lower rack of the support platform. The control system includes a human-machine interface, a programmable logic controller, two motor drivers, and a relay. The human-machine interface is connected to the programmable logic controller. The programmable logic controller is connected to the two motor drivers and the relay. The two motor drivers are respectively connected to the feeding motor and the cleaning motor through motor wires and encoder wires. The human-machine interface controls the feeding motor and the cleaning motor respectively through the two motor drivers. The relay is connected to the circulation pump, and the human-machine interface controls the circulation pump through the relay.

[0015] The present invention proposes an automatic cleaning method for nuclear-grade container stretching bolts. The method includes: Step 1: Move the device to the working area through the wheels, and rotate the movable support device to make the wheels away from the ground. Step 2: Pour the cleaning agent into the liquid collection box. Select the bracket and the installation position of the bracket on the pallet according to the specifications of the cleaning bolts, and install the bracket on the pallet. Step 3: Place the stretching bolt between the bracket and the rotating cylinder, close the lid of the liquid collection box, and use the control system to start the feeding motor and the cleaning motor. The feeding motor and the cleaning motor drive the cleaning brush component and the rotating component to rotate. Step 4: Manually rotate the handwheel of the feeding component to make the stretching bolt contact the brush pieces of the cleaning brush component, and select an appropriate feeding amount of the feeding component according to the dirt degree of the stretching bolt. Step 5: Use the control system to start the circulation pump. The circulation pump sprays the cleaning agent from the cleaning agent spray head, and observe the cleaning degree of the tension bolt through the plexiglass of the tank cover. Step 6: After the tension bolt is cleaned, manually rotate the handwheel of the feeding component in the reverse direction to move the tension bolt away from the cleaning brush assembly. Use the control system to turn off the feeding motor, the circulation pump and the cleaning motor, open the cover of the liquid collection tank, and take out the tension bolt.

[0016] Implementing the present invention has the following beneficial effects: 1. The present invention provides an automatic cleaning device and cleaning method for the tension bolts of nuclear-grade containers. This device replaces manual cleaning by setting up a cleaning mechanism, reducing the workload of 7 to 8 people to 1 person, thus greatly reducing the collective dose and saving human resources. This device is relatively small in size, its external dimensions should be able to enter the smallest elevator in the nuclear island plant, it is light in weight, and comes with rollers, which is convenient for handling in the nuclear island plant.

[0017] 2. For the automatic cleaning device and cleaning method of the tension bolts of nuclear-grade containers in the present invention, this device reduces the overflow of the cleaning agent and the spread of loose contamination by setting up a sealed liquid collection tank and designing the tank cover, so that the cleaning process of the tension bolts is carried out in a sealed chamber.

[0018] 3. For the automatic cleaning device and cleaning method of the tension bolts of nuclear-grade containers in the present invention, this device is supported in the form of a rotating cylinder and a bracket, and can meet the cleaning requirements of bolts of various sizes from M24 to M68 through different installation methods.

[0019] 4. For the automatic cleaning device and cleaning method of the tension bolts of nuclear-grade containers in the present invention, this device is provided with a cleaning agent circulation mechanism, so that the cleaning agent can be recycled, greatly reducing the amount of cleaning agent used and the discharge of waste liquid. This device is provided with a separate cleaning mechanism for each bolt, avoiding the mutual collision and damage of bolts when multiple bolts are soaked.

[0020] 5. For the automatic cleaning device and cleaning method of the tension bolts of nuclear-grade containers in the present invention, this device is controlled by PLC for cleaning, selects motors with high safety factors, and has complete functions, is safe and reliable, easy to operate and easy to maintain. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of an automatic cleaning device for the tension bolts of nuclear-grade containers proposed in an embodiment of the present invention; Figure 2 It is a schematic diagram of the cleaning mechanism of an automatic cleaning device for the tension bolts of nuclear-grade containers proposed in an embodiment of the present invention; Figure 3 It is the front view of the bracket of an automatic cleaning device for the tension bolts of nuclear-grade containers proposed in an embodiment of the present invention; Figure 4 Left view of the bracket of an automatic cleaning device for nuclear - level container tensile bolts proposed in an embodiment of the present invention; Figure 5 Schematic diagram of the threaded holes of the pallet of an automatic cleaning device for nuclear - level container tensile bolts proposed in an embodiment of the present invention; Figure 6 Schematic diagram of the cleaning agent circulation mechanism of an automatic cleaning device for nuclear - level container tensile bolts proposed in an embodiment of the present invention; Description of the drawings: 1. Box cover; 2. Cleaning mechanism; 3. Liquid collection box; 4. Liquid supply box; 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. Tensile bolt; 24. Bracket; 25. Cleaning brush component; 26. Pallet; 241. Block; 242. Bracket; 243. Roller. Detailed implementation manners

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings and detailed implementation manners. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] As Figures 1 to 6 shown, the present invention proposes an automatic cleaning device for nuclear - level container tensile bolts. The device includes a support platform, a cleaning mechanism 2, a power mechanism, a cleaning agent circulation mechanism, and a control system. The height of the device is less than 1000 mm, the length is less than 900 mm, and the width is less than 600 mm. It has a compact structure and a small volume.

[0024] The support platform is the installation reference platform for each component. The optimized design of the support platform is mainly carried out based on the convenience of equipment use, actual use site limitations, and use environment requirements. As Figure 1As shown in the figure, due to strict requirements for the floor area of the equipment, the support platform adopts a double-layer rectangular frame structure, which is divided into two racks, the upper rack and the lower rack. The liquid collection tank 3 of the cleaning agent circulation mechanism is arranged on the upper rack, and the liquid supply tank 4 of the cleaning agent circulation mechanism and the control box 5 containing the control mechanism are arranged on the lower rack. The liquid supply tank 4 is arranged directly below the liquid collection tank 3, and a filter 8 of the cleaning agent circulation mechanism is arranged between the liquid supply tank 4 and the liquid collection tank 3. Wheels 7 and movable supports 6 are arranged at the bottom of the support platform. The movable support 6 is movable feet arranged at the four corners of the bottom of the support platform. A screw rod is arranged at the top of the movable feet, and the movable feet are connected to the bottom of the support platform through threads. The height of the movable feet is changed by rotating the screw rod. Due to the high humidity at the site and the certain corrosiveness of the cleaning agent used in the device, the material of the support platform is selected as 304 stainless steel, which is beneficial to the anti-corrosion of the equipment and is also convenient for decontaminating the equipment. The device adopts a double-layer structure layout, which greatly saves the floor area of the equipment. At the same time, the platform can receive and recycle the cleaning agent in the liquid collection tank 3, and the cleaning agent flows back into the liquid supply tank 4 after being filtered for recycling, effectively preventing the cleaning agent from flowing out and polluting the equipment and the site.

[0025] In order to effectively utilize the cleaning agent and reduce the waste liquid discharge, the cleaning agent of the equipment can be recycled to a certain extent. Therefore, a cleaning agent circulation mechanism is set up in this device. As Figure 6 shown in the figure, the cleaning agent circulation mechanism mainly realizes the functions of supplying, spraying the cleaning agent and filtering treatment for the recycling of the cleaning agent. 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 pipeline, the filter 8 is connected to the liquid supply tank 4 through a pipeline, the liquid supply tank 4 is connected to the circulation pump 9 through a pipeline, the circulation pump 9 is connected to the cleaning agent spray head 10 through a pipeline, a cleaning mechanism 2 is arranged inside the liquid collection tank 3, and the cleaning agent spray head 10 is arranged above the cleaning mechanism 2.

[0026] The liquid collection tank 3 has a double-layer structure inside. The upper layer is a sealed cleaning tank, and the lower layer is a waste liquid tank. A cleaning mechanism 2 is provided inside the sealed cleaning tank. A tank cover 1 is provided at the top of the sealed cleaning tank. A sealing strip is inlaid at the interface between the tank cover 1 and the sealed cleaning tank, and the sealing strip effectively seals the tank body, which can effectively prevent the cleaning liquid from volatilizing during the cleaning process and causing pollution to the workshop. The tank cover 1 is provided with a glass window, through which the operator can observe the stretching bolt 23 being cleaned to determine the working condition of the cleaning machine. The glass window is made of corrosion-resistant plexiglass material to enhance its corrosion resistance and mechanical strength. A sealed interface is provided at the bottom of the sealed cleaning tank, and the waste liquid is discharged from the sealed cleaning tank body to the waste liquid tank through the sealed interface. The cleaning agent in the liquid collection tank 3 is filtered by a pipeline through a filter 8 and then flows into the liquid supply tank 4. A circulation pump 9 transports the cleaning agent in the liquid supply tank 4 to the cleaning agent spraying head 10, thus realizing the recycling of the cleaning agent. The amount of the cleaning agent used can be determined according to actual needs. The capacity of the liquid supply tank 4 is about 26L, which can meet the cleaning requirements of multiple bolts at one time. The cleaning agent can be recycled all the time. When the cleaning agent in the liquid collection tank 3 is insufficient, it is supplemented or replaced manually.

[0027] As Figure 2 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 tank. A slide rail is provided at the upper end of the base, and a 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. A support plate 26 is fixedly connected to the outside of the rotating component on the side where the cleaning brush component 25 is provided, and a bracket 24 is provided at the upper end of the support plate 26.

[0028] The 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. A handwheel is provided 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 3, and the handwheel is provided outside the liquid collection tank 3. The contact position between the liquid collection tank 3 and the threaded rod is sealed. The feeding component 21 mainly feeds the rotating component. The rotating component can slide on the slide rail. By rotating the handwheel, the position of the rotating component is controlled to adjust the position between the bolt and the cleaning brush, so as to adjust the contact force between the bolt and the cleaning brush.

[0029] The rotating component includes a rotating cylinder 22, a rotating cylinder base and a slider. The rotating cylinder 22 is rotated by a feeding motor. A rotating cylinder base is provided at the lower end of the rotating cylinder 22, and a slider is provided at the lower end of the rotating cylinder base. The slider cooperates with the slide rail of the base. The outer surface of the rotating cylinder 22 adopts a rubber coating process to enhance its surface friction coefficient. The stretching bolt 23 is placed between the bracket 24 and the rotating cylinder 22. The rotation of the rotating cylinder 22 drives the slow rotation of the bolt, so as to realize the cleaning of all surfaces of the bolt. The rotation speed of the stretching bolt 23 can be flexibly adjusted in the range of 0-1000 rpm.

[0030] As Figure 3 and Figure 4 shown, in order to adapt to different bolt thread sizes, it is achieved by the position of the bracket 24 and the rotating part. In this way, when the cleaning machine cleans different bolts, only one bracket 24 needs to be replaced. The bolt cleaning device is applicable to bolts with a diameter of 24 mm - 68 mm, specifically including 24 mm, 27 mm, 33 mm, 36 mm, 48 mm, and 68 mm. For simplicity of operation, two specifications of brackets 24 are designed, each with two installation methods to meet the support requirements of the above various specifications of bolts. The bracket 24 is designed in an L shape. The L-shaped bracket 24 is composed of a vertical plate and a horizontal bottom plate. There are stoppers 241 on both sides of the vertical plate. The vertical plate and the stoppers 241 are connected by screws. There is a horizontal bracket 242 at the top of the vertical plate, and there are several rollers on the bracket 242. When the stretching bolt 23 is placed on the top of the bracket 24, the rollers are in contact with the stretching bolt 23. When the stretching bolt 23 rotates with the rotating cylinder 22, the rollers are used to reduce the friction between the stretching bolt 23 and the bracket 24 and prevent thread scratches.

[0031] As Figure 4 and Figure 5 shown, there are 4 axially symmetric threaded holes at the four corners of the horizontal bottom plate. These threaded holes are used to connect with the support plate 26. The support plate 26 has several groups of threaded holes at different positions. Each group has 4 threaded holes, and the positions correspond to the threaded hole positions on the bracket 24. By installing the horizontal bottom plate of the bracket 24 on different groups of threaded holes of the support plate 26, the distance between the bracket 24 and the rotating cylinder 22 is changed, so as to adapt to stretching bolts 23 with different diameters. At the same time, due to the symmetric design of the threaded holes on the horizontal bottom plate, the bracket 24 also has two assembly methods, that is, the horizontal bottom plate faces the rotating part or the horizontal bottom plate faces the cleaning brush mechanism. For the above six specifications of bolts of 24 mm, 27 mm, 33 mm, 36 mm, 48 mm, and 68 mm, a total of 2 bracket 24 structures are designed. The distance between the two threaded holes in the horizontal direction of the horizontal bottom plate of one bracket 24 (that is, the distance between the two threaded holes close to the vertical plate side and the two threaded holes far from the vertical plate side) is 3 mm, as Figure 5 shown, in Figure 5The schematic diagram of two groups of threaded holes of the pallet 26 is disclosed. One group of threaded holes is shown as hollow, and a cross mark is indicated at the center of the other group of threaded holes. The left side in the figure faces the rotating cylinder 22, and the right side faces the cleaning brush mechanism. When the horizontal bottom plate of the bracket 24 is installed on the hollow group of threaded holes of the pallet 26 in the figure with the side facing the rotating cylinder 22, at this time, the vertical standing plate of the bracket 24 is spaced from the rotating cylinder 22 to fit a tension bolt 23 with a diameter of 27 mm. When the horizontal bottom plate rotates 180 degrees and is installed on the hollow group of threaded holes of the pallet 26 facing the cleaning brush mechanism, at this time, the vertical standing plate of the bracket 24 is spaced from the rotating cylinder 22 to fit a tension bolt 23 with a diameter of 24 mm. Similarly, when the horizontal bottom plate of the bracket 24 is installed on the group of threaded holes with a cross at the center of the pallet 26 in the figure with the side facing the rotating cylinder 22, at this time, the vertical standing plate of the bracket 24 is spaced from the rotating cylinder 22 to fit a tension bolt 23 with a diameter of 36 mm. When the horizontal bottom plate rotates 180 degrees and is installed on the group of threaded holes with a cross at the center of the pallet 26 facing the cleaning brush mechanism, at this time, the vertical standing plate of the bracket 24 is spaced from the rotating cylinder 22 to fit a tension bolt 23 with a diameter of 33 mm.

[0032] The distance between the two threaded holes in the horizontal direction of the horizontal bottom plate of another bracket 24 (that is, the distance between the two threaded holes close to the vertical standing plate side and the two threaded holes far from the vertical standing plate side) is 20 mm. This kind of bracket 24 is installed in another group of threaded holes designed on the pallet 26, and through the above two installation methods, it fits tension bolts 23 with diameters of 48 mm and 68 mm.

[0033] The cleaning brush mechanism is composed of a brush cylinder and detachable brush pieces. The brush pieces are detachably installed on the outer surface of the brush cylinder. The brush cylinder drives the brush pieces to rotate at high speed through a high-power cleaning motor to achieve the cleaning function of the bolts. The rotating cylinder 22 and the cleaning brush mechanism rotate in the same direction. The cleaning brush mechanism rotates at high speed, and its rotation speed range is adjustable from 0 to 1500 r / min, while the rotating cylinder 22 rotates at low speed, and its rotation speed range is adjustable from 0 to 75 r / min. In order to ensure the stable cleaning effect of the cleaning brush, the cleaning brush pieces can move within a certain range in the radial direction, which can ensure the contact force between the cleaning brush and the bolt thread, and at the same time can also adapt to the cleaning of threads with different diameters. The cleaning agent spraying head 10 is fixed together with the cleaning brush mechanism, and the cleaning agent spraying head 10 is arranged above the brush pieces. When cleaning, the cleaning agent spraying head 10 sprays liquid onto the thread surface.

[0034] The power mechanism includes a feeding motor and a cleaning motor. The feeding motor is connected to the rotating cylinder 22, and the feeding motor controls the rotation of the rotating cylinder 22; the cleaning motor is connected to the brush cylinder, and the cleaning motor controls the rotation of the brush cylinder. Since the required motor power is not large, AC servo motors are selected. The technology of AC servo itself draws on and applies the technology of frequency conversion, and the frequency conversion link and the driver are integrated into one. The current loop, speed loop, and position loop of the servo driver (the frequency converter does not have a position loop) have more precise control technologies and algorithm operations than ordinary frequency conversion, and it is also much more powerful than traditional frequency conversion in terms of functions. Select the motor according to the transmission relationship and load conditions of each transmission mechanism and convert it to the load torque of the motor shaft according to the relevant calculation formula, and consider a safety factor of 3 times. The following are the motors selected for each mechanism after calculation. The feeding motor selects the Inovance AC servo motor MS1H3-85B15CB; the driving motor selects the Inovance AC servo motor MS1H1-10B30CB.

[0035] As Figure 6 shown, the control system is set in the control box 5. The control system adopts a distributed control system with a programmable logic controller (referred to as PLC) and an industrial control computer as the core. The control system uses a human-machine interface (referred to as HMI) to connect to the programmable logic controller (referred to as PLC). The programmable logic controller is connected to two motor drivers and a relay. The two motor drivers are respectively connected to the feeding motor and the cleaning motor through motor wires and encoder wires. The motor drivers use CAN field control bus technology, Ethernet communication technology, and SSCNET network technology for servo motor control to control the feeding motor and the cleaning motor. The relay is connected to the circulation pump 9 to control the circulation pump 9. By adopting these technologies, the finally developed product has the characteristics of complete functions, safety and reliability, convenient operation, easy maintenance, and convenient function expansion. See the control system structure diagram for details.

[0036] The present invention proposes an automatic cleaning method for nuclear-grade container tensile bolts, and the method includes: Step 1: Move the device to the working area through the wheels 7, and rotate the movable support 6 to support the device, so that the wheels 7 are away from the ground to improve the stability of the equipment; Step 2: Pour 20L of cleaning agent into the liquid collection tank 3, and select the specification of the bracket 24 and the installation position of the tray 26 according to the specification of the cleaning bolt; Step 3: Place the tensile bolt 23 between the bracket 24 and the rotating cylinder 22, close the lid 1 of the liquid collection tank 3, and use the control system to start the feeding motor and the cleaning motor. The feeding 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 feeding component 21 to make the tensile bolt 23 contact the brush piece of the cleaning brush component 25, and select an appropriate feeding amount of the feeding component 21 according to the dirt degree of the tensile 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, and observe the cleaning degree of the tension bolt 23 through the plexiglass of the tank cover 1. Step 6: After the tension bolt 23 is cleaned, manually rotate the handwheel of the feeding component 21 in the reverse direction to move the tension bolt 23 away from the cleaning brush assembly. Use the control system to turn off the feeding motor, the circulation pump 9 and the cleaning motor, open the tank cover 1 of the liquid collection tank 3, and take out the tension bolt 23.

[0037] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. An automatic cleaning device for tension bolts of nuclear-grade containers, characterized in that: The device comprises a support platform, a cleaning mechanism (2) and a cleaning agent circulation mechanism. The support platform is a double-layer rectangular parallelepiped frame structure. The support platform is provided with an upper frame and a lower frame. The cleaning agent circulation mechanism comprises a liquid collecting box (3), a circulation pump (9), a filter (8), a liquid supply box (4) and a cleaning agent spray head (10). The liquid collecting box (3) is connected to the circulation pump (9), the filter (8), the liquid supply box (4) and the cleaning agent spray head (10) in sequence through a pipeline. The liquid collecting box (3) is arranged on the upper frame. A cleaning mechanism (2) is arranged inside the liquid collecting box (3). The cleaning mechanism (2) is used to clean the tension bolts (23). The cleaning agent spray head (10) is arranged at the upper end of the cleaning mechanism (2). The liquid supply box (4) is arranged on the lower frame.

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

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

4. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 3 is characterized in that: The sealed cleaning box of the liquid collecting box (3) is provided with a sealed interface at the bottom, and the cleaning agent enters the waste liquid box at the lower layer of the liquid collecting box (3) through the sealed interface; the support platform body is made of stainless steel, and the capacity of the liquid supply box (4) is 25-30L; the height of the device is less than 1000mm, the length is less than 900mm, and the width is less than 600mm.

5. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 4 is characterized in that: The cleaning mechanism (2) comprises a base, a brush component, a rotating component, a support plate (26), a bracket (24) and a feeding component (21); the base is mounted on the bottom of the sealed cleaning box; a slide rail is provided at the upper end of the base; the rotating component is provided on the slide rail; a cleaning brush assembly is provided on one side of the rotating component; a feeding component (21) is provided on the other side of the rotating component; a side of the rotating component provided with the cleaning brush assembly is externally fixedly connected to the support plate (26); the bracket (24) is provided at the upper end of the support plate (26); the feeding component (21) comprises a support frame, a threaded rod and a hand wheel; the support frame is fixed to the base; the threaded rod passes through the support frame; a hand wheel is provided 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 collecting box (3); the hand wheel is provided on the outer side of the liquid collecting box (3); and the contact position between the liquid collecting box (3) and the threaded rod is sealed.

6. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 5 is characterized in that: The rotating component comprises a rotating cylinder (22), a rotating cylinder base and a slider. The rotating cylinder (22) is provided with a rotating cylinder base at the lower end. The rotating cylinder base is provided with a slider at the lower end. The slider cooperates with a slide rail of the base. The rotating cylinder is covered with rubber. A 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 adjusted in the range of 0 to 1000 rpm / min.

7. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 6 is characterized in that: The bracket (24) is of L-shaped design. The bracket (24) comprises a stopper (241), a screw, a bracket (242), a roller, a vertical upright plate and a horizontal bottom plate. The horizontal bottom plate is provided at the lower end of the vertical upright plate. Stoppers (241) are provided on both sides of the vertical upright plate. The vertical upright plate and the stoppers (241) are connected by screws. A horizontal bracket (242) rod is provided at the top end of the vertical upright plate. A plurality of rollers are provided on the bracket (242). Four axisymmetric threaded holes are provided at the four corners of the horizontal bottom plate. The threaded holes are used to connect with the bracket (26).

8. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 7 is characterized in that: The support plate (26) is provided with a plurality of groups of threaded holes at different positions, each group of the threaded holes being provided with four. The positions of the threaded holes correspond to the positions of the threaded holes on the support plate (24). The transverse bottom plate of the support plate (24) is installed on the different groups of threaded holes on the support plate (26), so as to change the distance between the support plate (24) and the rotating cylinder (22) and adapt to tension bolts (23) of different diameters. The transverse bottom plate of the support plate (24) is installed on the support plate (26) in two ways: facing the rotating cylinder (22) and facing the cleaning brush mechanism, so as to adapt to tension bolts (23) of two different diameters. The support plate (24) adjusts the sizes of the vertical stand plate and the transverse bottom plate according to the diameter of the tension bolts (23). The support plate (26) is provided with a plurality of groups of threaded holes adapted to the support plates (24) of different sizes according to the positions of the threaded holes of the transverse bottom plate of the support plate (24).

9. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 8 is characterized in that: The cleaning brush mechanism comprises a brush barrel and a brush sheet, wherein the brush sheet is detachably mounted on the outer surface of the brush barrel, the brush sheet has a radially retractable function, the brush barrel drives the brush sheet to rotate, the rotating barrel (22) rotates in the same direction as the cleaning brush mechanism, and the rotation speed of the cleaning brush mechanism is higher than that of the rotating barrel (22); a cleaning agent spray head (10) is fixedly arranged on the top of the cleaning brush mechanism.

10. The automatic cleaning device for tension bolts of a nuclear-grade container according to claim 1 is characterized in that: The device is also provided with a power mechanism, the power mechanism comprising a feeding motor and a cleaning motor, the feeding motor being connected to the rotating drum (22), and the feeding motor controlling the rotation of the rotating drum (22); the cleaning motor being connected to the brush drum, and the cleaning motor controlling the rotation of the brush drum; the device is also provided with a control system, the control system being arranged in a control box (5), the control box (5) being arranged on the lower frame of the support platform, the control system comprising a human-machine interface, a programmable logic controller, two motor drivers and a relay, the human-machine interface being connected to the programmable logic controller, the programmable logic controller being connected to the two motor drivers and the relay, the two motor drivers being connected to the feeding motor and the cleaning motor respectively via a motor line and an encoder line, the human-machine interface controlling the feeding motor and the cleaning motor respectively via the two motor drivers; the relay being connected to a circulation pump (9), the human-machine interface controlling the circulation pump (9) via the relay.

11. A method for automatically cleaning a nuclear-grade container tension bolt (23) according to any one of claims 1 to 10, characterized in that: The method comprises: Step 1: Move the device to the working area via 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: pouring cleaning agent into the liquid collecting box (3), selecting the bracket (24) and the installation position of the bracket (24) on the support plate (26) according to the specifications of the cleaning bolts, and installing the bracket (24) on the support plate (26); Step 3: placing the tension bolt (23) between the bracket (24) and the rotating cylinder (22), closing the cover (1) of the liquid collecting box (3), and using the control system to start the feeding motor and the cleaning motor, so that the feeding motor and the cleaning motor drive the cleaning brush component (25) and the rotating component to rotate; Step 4: manually rotating the hand wheel of the feeding component (21) so that the tension bolt (23) contacts the brush sheet of the cleaning brush component (25), and selecting the feeding amount of the feeding 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), and observe the cleanliness of the tension bolt (23) through the organic glass of the box cover (1); Step 6: After the tension bolt (23) is cleaned, manually rotate the handwheel of the feed component (21) in the opposite direction to move the tension bolt (23) away from the cleaning brush assembly, use the control system to turn off the feed motor, circulation pump (9) and cleaning motor, open the box cover (1) of the liquid collection box (3), and take out the tension bolt (23).

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