Radioactive storage tank spraying decontamination device, system and method

Abstract

The invention provides a radioactive storage tank spraying decontamination device which comprises a driving mechanism, an executing mechanism, a spraying head and a spraying hose, the driving mechanism is installed on a storage tank to be treated, the executing mechanism comprises a probing part, an extending part and a transmission part, one end of the probing part is connected with the driving mechanism, and the other end of the probing part serves as a probing end used for probing into the storage tank to be treated; one end of the extending part is movably connected to the probing end of the probing part, the other end of the extending part is used for extending in the circumferential direction of the probing end, and the transmission part is driven by the driving mechanism to drive and adjust the relative angle between the extending direction of the extending part and the probing direction of the probing part; the spraying hose is movably connected to the probing part and the extending part, and the end, probing into the storage tank to be treated, of the spraying hose is connected with the spraying head. The radioactive storage tank spraying decontamination device is not affected by radioactivity, can conduct displacement, reduces the limitation of the layout position, is easy to approach the contaminated surface, and has a good decontamination effect. The invention further provides a radioactive storage tank leaching system and method.

Description

Technical Field

[0001] The present invention specifically relates to a radioactive storage tank spray decontamination device, system and method. Background Art

[0002] There are a large number of large radioactive tanks waiting to be decommissioned in the field of nuclear facility decommissioning, especially tanks with high radioactivity levels. Since these tanks have been storing waste liquid with high radioactivity levels for a long time, accompanied by multiple physical and chemical reactions such as nuclide decay, radiation degradation, crystallization, and deposition, the radioactive characteristics and physical and chemical properties in the environment have undergone significant changes, and the radioactive contamination of the inner wall of the tank is complex and difficult to predict. At the same time, the internal structure of the tank is complex, with several groups of stainless steel cooling water snakes, poor mechanical accessibility in the space, and many irradiation hot spots. These characteristics seriously hinder the smooth implementation of decontamination work in the tank.

[0003] For process systems with high radioactivity levels, chemical immersion is generally the preferred decontamination method. The chemical reaction between the decontamination liquid and the nuclides can effectively remove radioactive pollutants on the tank wall. However, due to the large internal dimensions of large decommissioned tanks, the immersion decontamination method commonly used in process systems will generate a large amount of waste liquid. In engineering, high-pressure water decontamination is often used for large tanks, which requires a high-pressure spray gun to be close to the tank wall. However, the internal space of large tanks with high radioactivity levels is usually densely covered with coils, and it is difficult to get a high-pressure spray gun close to the tank wall, and it is also difficult to clean the outer surface of the coil that is heavily contaminated. In addition, due to the influence of radioactivity, it is difficult to layout automated drive displacement equipment. After the spray gun penetrates into the tank, it is very restricted by the layout position and can only be simply flushed at a single location. It is difficult to spray at multiple points and angles. If a hole is opened on the tank to layout the spray gun, the risk of radioactive leakage will increase. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a radioactive tank spray decontamination device in view of the above-mentioned deficiencies in the prior art. The device is not affected by radioactivity, can be displaced, reduces the restrictions on the layout position, is easy to approach the contaminated surface, has multi-point and multi-angle spraying capabilities, and has a good decontamination effect. The present invention also provides a radioactive tank elution system and method.

[0005] The present invention provides a radioactive tank spray decontamination device, comprising a driving mechanism, an actuator, a spray head and a spray hose, wherein the driving mechanism is installed on the tank to be treated, the actuator comprises an insertion part, an extension part and a transmission part, one end of the insertion part is connected to the driving mechanism as a first connection end, and the other end is used as a insertion end for inserting into the interior of the tank to be treated, one end of the extension part is movably connected to the insertion end of the insertion part as a second connection end, and the other end is used as an extension end for extending in the circumferential direction of the insertion end, one end of the transmission part is connected to the driving mechanism, and the other end is connected to the extension part, so as to drive and adjust the relative angle between the extension direction of the extension part and the insertion direction of the insertion part under the drive of the driving mechanism; the spray hose is movably connected to the insertion part and the extension part, and the end portion inserted into the tank to be treated is connected to the spray head, so as to transport the decontamination liquid to the spray head.

[0006] Furthermore, the probe part is a cylindrical component, and the transmission part is a flexible traction rope. The traction rope is passed through a vacant area in the probe part, and one end of the traction rope is connected to a driving mechanism, and the other end passes through the probe part at a set distance from the probe end, and is connected to the extension end of the extension part, so as to pull and drive the extension part to move under the drive of the driving mechanism.

[0007] Furthermore, the driving mechanism includes a mounting platform and an electric cylinder, the first connecting end of the probe portion is connected to the bottom surface of the mounting platform, the electric cylinder is installed on the top surface of the mounting platform, and the top end of the traction rope passes through the mounting platform and is wound on the output end of the electric cylinder.

[0008] Further, the transmission part is a transmission rod, which includes a connecting rod and a rocker rod. The connecting rod is arranged parallel to the insertion part and is axially movably connected to one side of the insertion part, and one end is connected to the driving mechanism, and the other end is hingedly connected to one end of the rocker rod. One side of the second connection end of the extension part is hingedly connected to the insertion end of the insertion part, and the side opposite to the hinged side is hingedly connected to the other end of the rocker rod, so that the connecting rod, under the drive of the driving mechanism, drives the rocker rod to push the extension part to move around the hinged side.

[0009] Furthermore, the driving mechanism includes a mounting platform and an axial driving member, the first connecting end of the insertion portion is connected to the bottom surface of the mounting platform, the axial driving member is installed on the top surface of the mounting platform, and the top end of the transmission rod passes through the mounting platform and is connected to the output end of the axial driving member.

[0010] Furthermore, the radioactive tank spray decontamination device also includes a rotating mechanism, which includes a rotating motor, a rotating gear, a guide cylinder and a gear ring. The outer part of the mounting platform is sleeved with a gear ring, which is meshed with the rotating gear. The driving end of the rotating motor is connected to the rotating gear to drive the rotating gear to drive the gear ring, so that the mounting platform drives the insertion part and the extension part to move; the guide cylinder cover is arranged on the outside of the mounting platform, and the rotating motor is installed on the guide cylinder.

[0011] Furthermore, the rotating mechanism includes a lock, and the driving mechanism also includes a connecting cylinder, which is fixedly connected to the storage tank to be processed. The mounting platform passes through and is rotatably connected to the connecting cylinder to drive the insertion part and the extension part to move. The lock is opened and closed between the connecting cylinder and the mounting platform to lock the mounting platform at a set angle position.

[0012] Furthermore, the probe part is a cylindrical component, the spray hose passes through the vacant area in the probe part, and is placed on the extension part, and the end near the extension end is connected to the spray head, and the extension part is provided with at least two limit strips arranged on a vertical plane to limit the spray hose.

[0013] Furthermore, the radioactive tank spray decontamination device also includes a lifting mechanism, which includes a turntable, a drive motor and a bracket. The bracket is installed on the upper platform of the tank to be treated. The turntable is rotatably connected to the bracket. The drive motor is connected to the bracket. The drive end is connected to the rotating shaft of the turntable to drive the turntable to rotate. The top end of the spray hose passes through the drive mechanism and is wound on the turntable.

[0014] Furthermore, the lifting mechanism also includes a guide wheel, the bracket is provided with a guide portion located directly above the driving mechanism, the guide wheel is rotatably connected to the guide portion, and the top end of the spray hose is wound on the turntable after being turned by the guide wheel.

[0015] Furthermore, the radioactive tank spray decontamination device also includes a control unit, which is electrically connected to the driving mechanism and is used to control the driving mechanism so that the spray head reaches a specified height position.

[0016] The present invention also provides a radioactive tank elution system, comprising a tank to be treated, a feed pipe, a circulation pump, a pipeline and the above-mentioned radioactive tank spray decontamination device, wherein the radioactive tank spray decontamination device is installed on the upper platform of the tank to be treated, and an actuator carrying a spray head and a spray hose is inserted into the tank to be treated, the feed pipe penetrates into the tank to be treated, the circulation pump is installed at the bottom of the tank to be treated, and is connected to the spray hose inlet of the radioactive tank spray decontamination device through a pipeline, a filter, a first solenoid valve and a flow meter are provided on the pipeline, a branch directly leading to the tank to be treated is provided on the filter, and a second solenoid valve is provided on the branch.

[0017] The present invention also provides a method for eluting a radioactive tank, using the above radioactive tank eluting system, the method comprising the following steps:

[0018] The radioactive tank spray decontamination device is hoisted and installed on the upper platform of the tank to be treated;

[0019] Install the circulation pump at the bottom of the storage tank to be treated;

[0020] Insert the sprinkler head, sprinkler hose and actuator into the storage tank to be treated;

[0021] Inject decontamination liquid into the storage tank to be treated through the feed pipe until the required liquid level of the circulation pump is reached;

[0022] The circulation pump supplies the decontamination liquid to the spray head through the pipeline to realize the circulation decontamination elution.

[0023] The radioactive tank spray decontamination device of the present invention adopts a probe part, an extension part and a transmission part as an actuator. By probing into the interior of the tank and then extending in the circumferential direction of the probe end, it can reach a specified position in the tank that is difficult to reach by the original probe position. It can not only drive the spray hose and the spray head to the cleaning dead corner that is difficult to reach with a conventional spray head, but can even go around the rear of the coil to achieve more comprehensive and precise spray cleaning, which can meet the overall decontamination needs of the radioactive tank and can effectively reduce the radioactivity level of the tank. It has a simple structure, is easy to move as a whole, and can be controlled from a distance.

[0024] Moreover, this structural setting can not only realize multi-angle and close-range spraying of components below the spray hole through the adjustment of the bending arm and the lifting mechanism, but more importantly, it can have countless different spraying points under a single tank top opening position, and this change can be realized without re-opening the hole layout on the storage tank, so as to cover the spray dead corners that are difficult to cover with other devices with as few holes as possible, and avoid increasing the risk of radioactive leakage when the tank top is opened with a multi-hole layout. And the displacement is realized by mechanical transmission, and the integrity and completeness of the function of this mechanical traction method will not be paralyzed by the serious influence of radiation. Therefore, this device is a device suitable for spray decontamination of radioactive storage tanks with limited internal space. It can also continuously flush the tank wall and the surface of the coil while minimizing the amount of decontamination liquid as much as possible, so as to achieve the lasting infiltration of the decontamination liquid on the inner surface of the tank and the surface of the coil, which is conducive to the reaction between the spray decontamination liquid and the surface pollution, thereby forming a good decontamination effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of a radioactive storage tank spray decontamination device in Example 1 of the present invention;

[0026] Figure 2 It is a three-dimensional structural schematic diagram of the actuator and the rotary mechanism in the radioactive tank spray decontamination device in Example 1 of the present invention;

[0027] Figure 3 It is another three-dimensional structural schematic diagram of the actuator and the rotary mechanism in the radioactive tank spray decontamination device in Example 1 of the present invention;

[0028] Figure 4It is a structural schematic diagram of the actuator in the radioactive storage tank spray decontamination device in Example 1 of the present invention;

[0029] Figure 5 is another structural schematic diagram of the actuator in the radioactive tank spray decontamination device in Example 1 of the present invention;

[0030] Figure 6 It is a schematic structural diagram of the extension part of the spray decontamination device for radioactive storage tanks in Example 1 of the present invention;

[0031] Figure 7 It is a schematic structural diagram of a driving mechanism in a radioactive tank spray decontamination device in Example 2 of the present invention;

[0032] Figure 8 It is a schematic structural diagram of the extension part of the spray decontamination device for radioactive storage tanks in Example 2 of the present invention;

[0033] Fig. 9 It is a structural schematic diagram of the lifting mechanism in the spray decontamination device for radioactive storage tanks in Example 1 of the present invention;

[0034] Fig.10 It is another structural schematic diagram of the lifting mechanism in the spray decontamination device for radioactive storage tanks in Example 1 of the present invention;

[0035] Fig.11 It is a schematic diagram of the structure of the radioactive storage tank elution system in Example 3 of the present invention. In the figure: 1. driving mechanism; 11. mounting table; 12. electric cylinder; 13. small pulley; 14. axial driving member; 15. connecting tube; 2. actuator; 21. probe; 22. extension; 221. guide wheel; 222. limit strip; 23. transmission part; 231. traction rope; 232. transmission rod; 2321. connecting rod; 2322. rocker rod; 3. sprinkler head; 4. sprinkler hose; 5. slewing mechanism; 51. slewing motor; 52. slewing gear; 53. guide tube; 54. gear ring; 55. protective cover; 56. lock; 6. lifting mechanism; 61. turntable; 62. driving motor; 63. bracket; 631. guide part; 64. guide wheel; 7. feeding pipe; 8. circulating pump; 9. pipeline; 91. filter; 92. first solenoid valve; 93. second solenoid valve; 94. flow meter. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0038] In the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0040] Example 1

[0041] like Figures 1 to 6 As shown, the radioactive tank spray decontamination device of this embodiment includes a driving mechanism 1, an actuator 2, a spray head 3 and a spray hose 4. The driving mechanism 1 is installed on the storage tank to be treated. The actuator 2 includes an insertion portion 21, an extension portion 22 and a transmission portion 23. One end of the insertion portion 21 is connected to the driving mechanism 1 as a first connection end, and the other end is used as a insertion end for inserting into the interior of the storage tank to be treated. One end of the extension portion 22 is movably connected to the insertion end of the insertion portion 21 as a second connection end, and the other end is used as an extension end for extending in the circumferential direction of the insertion end. One end of the transmission portion 23 is connected to the driving mechanism 1, and the other end is connected to the extension portion 22, so as to drive and adjust the relative angle between the extension direction of the extension portion 22 and the insertion direction of the insertion portion 21 under the drive of the driving mechanism 1; the spray hose 4 is movably connected to the insertion portion 21 and the extension portion 22, and the end inserted into the storage tank to be treated is connected to the spray head 3, so as to transport the decontamination liquid to the spray head 3.

[0042] Compared with the conventional nozzles that use the nozzles themselves to set a rotating or universal displacement structure, the device of this embodiment no longer relies solely on the rotation of the nozzles themselves to achieve the change of the spray angle, but directly changes the position of the spray head 3 itself. The radioactive tank spray decontamination device of this embodiment uses the probe part 21, the extension part 22 and the transmission part 23 as the actuator 2. By probing into the interior of the tank and then extending in the circumferential direction of the probe end, it can reach the specified position in the tank that is difficult to reach at the original probe position. It can not only drive the spray hose 4 and the spray head 3 to the cleaning dead corner that is difficult to reach with conventional nozzles, but can even go around the rear of the coil to achieve more comprehensive and detailed spray cleaning, which can meet the overall decontamination needs of the radioactive tank and effectively reduce the radioactivity level of the tank; and the structure is simple, easy to move as a whole, and can be controlled from a distance.

[0043] Moreover, this structural setting can not only be close to the surface of the tank wall to achieve close-range spraying of the decontamination liquid, but more importantly, it can achieve a change in the spraying position, and this change does not require a new hole layout on the storage tank, and will not cause radioactive leakage. The flushing coverage that originally required multiple layout points can be achieved at a single layout position, thereby covering a wider flushing range as much as possible, and the displacement is achieved through a transmission method. This mechanical traction method will not be affected by radioactivity and can achieve automatic displacement of the spray head 3. Therefore, this device is a device suitable for spraying and decontaminating radioactive storage tanks with limited internal space. It can also continuously flush the tank wall and the surface of the coil while minimizing the amount of decontamination liquid as much as possible, thereby achieving the purpose of dynamic immersion and forming a good decontamination effect.

[0044] In this embodiment, Figure 6 As shown, the transmission part 23 is a transmission rod 232, and the transmission rod 232 includes a connecting rod 2321 and a rocker rod 2322. The connecting rod 2321 is arranged parallel to the insertion part 21 and can be axially movably connected to one side of the insertion part 21, and one end of the connecting rod 2321 is connected to the driving mechanism 1, and the other end is hingedly connected to one end of the rocker rod 2322. One side of the second connection end of the extension part 22 is hingedly connected to the insertion end of the insertion part 21, and the side opposite to the hinged side is hingedly connected to the other end of the rocker rod 2322, so that the connecting rod 2321, under the drive of the driving mechanism 1, drives the rocker rod 2322 to push the extension part 22 to move around the hinged side.

[0045] Specifically, the insertion part 21 is arranged in the vertical direction, and the bottom end serves as the insertion end. The insertion part 21 is a cylindrical component, and the top end of the extension part 22 is the second connection end. One side of the top end is hingedly connected to the bottom end of the insertion part 21, and the side opposite to the hinged side is connected to the bottom end of the rocker arm 2322. The connecting rod 2321 is connected to one side of the insertion part 21 axially and movably (i.e., moves up and down) through a limiting structure (the limiting structure can be an annular structure connected to one side of the insertion part 21, and the connecting rod 2321 is inserted into the inner hole of the annular structure). The up and down movement of the connecting rod 2321 can not only provide sufficient room for movement for the rotation of the extension part 22, but also drive the rocker arm 2322 to move. Since the two ends of the rocker arm 2322 are respectively hinged to the extension part 22 and the connecting rod 2321, when the connecting rod 2321 moves axially downward, it can push the extension part 22 to tilt upward around the hinge. When the connecting rod 2321 moves axially upward, it can pull the extension part 22 to swing downward around the hinge. The hinged method can avoid interference with the rotation of the extension part 22.

[0046] In this embodiment, the driving mechanism 1 includes a mounting platform 11 and an axial driving member 14, the first connection end of the probe 21 is connected to the bottom surface of the mounting platform 11, the axial driving member 14 is installed on the top surface of the mounting platform 11, and the top end of the transmission rod 232 (connecting rod 2321) passes through the mounting platform 11 and is connected to the output end of the axial driving member 14. The axial driving member 4 can use an axial driving motor to achieve axial movement drive of the connecting rod 2321. A through hole is opened on the mounting platform 11 to facilitate the transmission part 23 and the spray hose 4 to pass through.

[0047] In this embodiment, the device further includes a rotary mechanism 5, which includes a rotary motor 51, a rotary gear 52, a guide cylinder 53 and a gear ring 54. The outer portion of the driving mechanism 1 is sleeved with a gear ring 54 (specifically, the outer portion of the mounting platform 11, so the mounting platform 11 can also be called a rotary platform), and the gear ring 54 is meshed and connected with the rotary gear 52. The driving end of the rotary motor 51 is connected to the rotary gear 52 to drive the rotary gear 52 to drive the gear ring 54, so that the mounting platform 11 drives the probe 21 and the extension 22 to follow; the guide cylinder 53 is covered on the outer portion of the mounting platform 11, and the rotary motor 51 is installed on the guide cylinder 53. The rotary mechanism 5 can drive the entire actuator 2 to rotate, so that the extension end of the extension 22 can achieve full circumferential coverage, thereby changing the positions of the spray hose 4 and the spray head 3, and achieving all-round spray cleaning in the tank. In this embodiment, a protective cover 55 can also be provided on the outer side of the gear ring 54 to prevent the gear ring 54 from being damaged and affecting the meshing.

[0048] In this embodiment, the probe 21 is a cylindrical component, the spray hose 4 passes through the vacant area in the probe 21, and is placed on the extension 22, and the end near the extension end is connected to the spray head 3, and the extension 22 is provided with at least two limit bars 222 arranged on a vertical plane to limit the spray hose 4. In this embodiment, the extension 22 is a bracket (or frame) structure formed by two limit bars 222, and the two limit bars 222 can be connected by a guide wheel 221, so that the spray hose 4 can be limited by the bracket and the spray hose 4 can be supported by the freely rolling guide wheel 221. In other ways, the extension 22 can also be set as a three-sided groove structure or a four-sided cylindrical component, which will not be described in detail here.

[0049] The spray hose 4 is not fixed inside the cylindrical member, but is connected with the cylindrical member in a free-moving manner. The cylindrical member is sleeved on the outside of the spray hose 4, which can protect the spray hose 4 and ensure the roundness of the cross section, avoiding the difficulty of liquid circulation due to pressure, and can ensure the follow-up of the spray hose 4 and the actuator 2 without the need for an additional connection structure. This setting structure can first ensure that the spray hose 4 and the spray head 3 can undergo structural displacement with the movement of the probe 21 and the extension 22, so that the flexible pipe can reach the specified position. Secondly, the spray hose 4 will not be squeezed or twisted due to the movement of the probe 21 and the extension 22, thereby ensuring the transportation of the cleaning liquid. Since the probe 21 mainly bears the function of containing the spray hose 4, it is called a spray rod in this embodiment, and the extension 22 is called a flex arm.

[0050] In this embodiment, Fig. 9 and Fig.10 As shown, the device also includes a lifting mechanism 6, which includes a turntable 61, a drive motor 62 and a bracket 63. The bracket 63 is installed on the upper platform of the storage tank to be treated. The turntable 61 is rotatably connected to the bracket 63. The drive motor 62 is connected to the bracket 63. The driving end is connected to the rotating shaft of the turntable 61, which is used to drive the turntable 61 to rotate. The top end of the spray hose 4 passes through the drive mechanism 1 and is wound on the turntable 61. The lifting mechanism 6 can make the spray hose 4 rise or fall, thereby adjusting the position of the spray head 3 extending out of the extension part 22. The turntable 61 is provided with grooves in the circumference (i.e., the grooves in the thickness direction formed by the diameter of the disk surface on both sides being larger than the diameter of the middle disk body). When winding, the spray hose 4 is stuck in the groove and disengaged in a certain way.

[0051] In this embodiment, the lifting mechanism 6 further includes a guide wheel 64, the bracket 63 is provided with a guide portion 631 located just above the driving mechanism 1, the guide wheel 64 is rotatably connected to the guide portion 631, and the top end of the spray hose 4 is turned by the guide wheel 64 and then wound on the turntable 61. The guide wheel 64 just above the driving mechanism 1 guides the spray hose 4 to avoid bending due to interference with other components during winding, thereby affecting the flow of liquid.

[0052] In this embodiment, the water supply side of the spray hose 4 is fixed on the coil bracket 63 and will not rotate with the rotation of the turntable 61. Specifically, it can be arranged at the center of the turntable 61 and then connected to the liquid supply device, that is, the spray hose 4 passes from the outside of the axis of the turntable 61 to the inside of the axis, and is wound on the turntable 61 from the center of the turntable 61 to the outer circle of the turntable 61. The other end of the spray hose 4 will pass through the drive motor 62 and then be wound on the turntable 61, and then the end will vertically extend into the tank. The rotation of the turntable 61 will not affect the stability of the interface.

[0053] In this embodiment, the device further includes a control unit, which is electrically connected to the drive mechanism 1 and is used to control the drive mechanism 1 so that the sprinkler head 3 reaches a specified height position. Specifically, after the initial zero-point orientation of the sprinkler head 3 is determined through debugging, the orientation position is used as the initial position. When the rotating mechanism 5 drives the mounting platform 11 to rotate, the rotation angle of the drive mechanism 1 can be observed, so as to know the rotation of the sprinkler head itself. Therefore, the control unit can obtain the position of the sprinkler head 3 and control the sprinkler head 3 to reach the target orientation by controlling the output rotation angle of the rotating motor 51 of the rotating mechanism 5; similarly, there is a corresponding relationship between the extended length of the driving end of the axial drive member 14, the axial position of the connecting rod 2321, and the swing position of the extension part 22. The corresponding relationship can be stored in the control unit, so that the control unit can obtain the position of the sprinkler head 3 and control the sprinkler head 3 to reach the target position by controlling the extended length of the driving end of the axial drive member 14.

[0054] In this embodiment, the relationship between the extended length y of the driving end of the axial driving member 14 and the horizontal distance x of the extension portion 22 extending circumferentially toward the protruding portion 21 is y=ax 2 +bx+c, where a, b, and c are all constants that can be calculated based on the dimensions of each component. In this embodiment, y=-0.0041x 2 +3.3941x+2.4617.

[0055] The present embodiment generally relates to a device for spraying and decontaminating radioactive storage tanks, including a spray head 3 , a driving mechanism 1 , a lifting mechanism 6 , an actuator 2 , a rotating mechanism 5 , and a spray hose 4 .

[0056] The actuator 2 and the driving mechanism 1 as a whole include a flex arm (i.e., the extension part 22), a spray rod (i.e., the insertion part 21), a transmission part 23 (a connecting rod 2321 and a rocker rod 2322), a mounting platform 11 and an axial driving member 14. The connecting rod 2321 is connected to the flex arm through the rocker rod 2322, and the top of the spray rod is connected to the mounting platform 11.

[0057] The lifting mechanism 6 is composed of a bracket 63, a coil turntable 61, a coil drive motor 62, a guide wheel 64, etc. The turntable 61 is connected to the bracket 63 through its own rotating shaft, the drive motor 62 is connected to the rotating shaft of the coil turntable 61, and the guide wheel 64 is fixed to the bracket 63 by screws. A part of the spray hose 4 is spirally wound in the groove of the tank top coil turntable 61, and the other part extends into the spray actuator 2 through the guide wheel 64 and is connected to the spray head 3 at the end of the hose. The control unit controls the drive motor 62 to drive the coil turntable 61 to rotate, completing the lifting and lowering action of the spray hose 4.

[0058] The slewing mechanism is composed of a slewing gear 52, a slewing motor 51, a guide cylinder 53, a protective cover 55, etc. The slewing motor 51 is connected to the slewing gear 52, the mounting platform 11 is connected to the gear ring 51, and the protective cover 55 is connected to the mounting platform 11 for protection. The control unit controls the start and stop of the slewing platform motor 51, and the movement of the slewing gear 52 drives the mounting platform 11 to rotate, and drives the actuator 2 to rotate.

[0059] When in use, first fix the spray decontamination device of this embodiment on the upper part of the equipment room at the top of the large tank (the storage tank to be treated) (i.e., the upper platform), operate the control unit, set the position of the spray head 3, for example, the vertical distance from the top of the large tank is "2m", start the coil drive motor 62, the coil turntable 61 rotates, the hose is gradually lowered, and the spray head 3 moves to a position 2m below the top of the large tank and stops.

[0060] Or operate the control unit to move the spray head 3 by bending the arm, for example, set the vertical distance between the spray head position and the top of the tank to "1m", start the coil drive motor, the coil turntable rotates, the hose is gradually lowered, and the spray head 3 moves to a position 1m below the top of the tank and stops; operate the control unit to set the angle between the bent arm and the spray rod to "120°" or set the horizontal length of the bent arm extending in the circumferential direction, start the axial drive member 14, the connecting rod 2321 continuously descends, and the bent arm is lifted to a position with an angle of 120° with the spray rod or a specified horizontal position.

[0061] Alternatively, operate the control unit to define the current direction as the zero point of the rotation coordinate, then set the rotation angle of the spray rod, for example, set it to "+90°", start the rotary motor 51, and drive the mounting platform 11 and the spray rod to rotate counterclockwise through the rotary gear rotation until they stop at an angle of 90° to the initial direction.

[0062] The spray decontamination device of this embodiment can be automatically controlled by an automatic control unit. The decontamination reagent contacts the tank wall and the surface of the coil to transfer the radioactive nuclides to the decontamination liquid through chemical soaking, dissolution, complexation, etc., to achieve the purpose of decontamination, and the decontamination agent can be recycled, with less secondary waste liquid.

[0063] Example 2

[0064] This embodiment is basically the same as the embodiment 1, and the probe portion 21 is a cylindrical member. The difference is that in this embodiment, Figure 7 and Figure 8 As shown, the transmission part 23 is a flexible traction rope 231, which is inserted into the vacant area in the probe part 21, and one end of the traction rope 231 is connected to the driving mechanism 1, and the other end passes through the probe part 21 at a set distance from the probe end, and is connected to the extension end of the extension part 22, so as to pull and drive the extension part 22 to move under the drive of the driving mechanism 1. In this embodiment, the traction rope 231 can be called a twisted rope, and a guide wheel 221 can be set on the extension end of the bent arm, which can be used to guide the spray hose 4.

[0065] In this embodiment, the driving mechanism 1 includes a mounting platform 11 and an electric cylinder 12. The first connection end of the probe 21 is connected to the bottom surface of the mounting platform 11. The electric cylinder 12 is installed on the top surface of the mounting platform 11. The top end of the traction rope 231 passes through the mounting platform 11 and is wound on the output end of the electric cylinder 12. Through the rotation output of the electric cylinder 12, the transmission part 23 can realize winding and contraction to lift the extension part 22 or release to reset the extension part 22 by gravity. A through hole is provided on the mounting platform 11 to facilitate the passage of the transmission part 23 and the spray hose 4. The electric cylinder 12 can be connected to the mounting platform 11 through a vertically arranged component. The vertical component can be provided with a small pulley 13 above the through hole of the mounting platform 11, so that the transmission part 23 can be displaced into the through hole through the small pulley 13 after being led out of the electric cylinder 12.

[0066] In this embodiment, the rotating mechanism 5 of the device includes a lock 56, and the driving mechanism 1 also includes a connecting tube 15, the connecting tube 15 is fixedly connected to the storage tank to be processed, and the mounting platform 11 passes through and is rotatably connected to the connecting tube 15 to drive the probe 21 and the extension 22 to follow, and the lock 56 is opened and closed between the connecting tube 15 and the mounting platform 11, and is used to lock the driving mechanism 1 at a set angle position. Specifically, four locks 56 can be provided and evenly distributed around the mounting platform 11, and four notches for locking the locks can be provided on the four sides of the mounting platform 11. When the mounting platform 11 rotates to the position corresponding to the notch and the lock 56, the mounting platform 11 can be locked, that is, the mounting platform 11 has four rotation positions. In other embodiments, the number of locks 56 can also be increased or decreased depending on the specific situation.

[0067] The actuator 2 and the driving mechanism 1 as a whole include a flex arm (i.e., an extension part 22), a spray rod (i.e., an insertion part 21), a twisted rope (i.e., a transmission part 23), a guide wheel 221, a mounting platform 11, an electric cylinder 12, and a small pulley 13. The top of the spray rod is connected to the mounting platform 11, and a twisted rope dedicated to the flex arm device runs through it. One end of the twisted rope is fixed next to the guide wheel 221 at the bottom of the flex arm, and the other end passes through the inside of the spray rod and is connected to the electric cylinder 12 through the small pulley 13. The control unit can control the electric cylinder to expand and contract the twisted rope to adjust the flex arm angle. Compared with Example 1, in this embodiment, the swinging action of the traction rope 231 pulling the extension part 22 and the rotation action of the actuator 2 driven by the mounting platform 11 can be completed by manual operation, further reducing the manufacturing cost.

[0068] During operation, after debugging and determining the initial zero position of the sprinkler head 3, the rotation angle of the drive mechanism 1 and the bracket can be observed when the slewing mechanism rotates, and the rotation of the sprinkler head itself can be known; in addition, the zero position of the rope retraction and extension is also determined in the rope retracting frame part controlled by the rotary table electric cylinder 12. When the rope is retracted, the change in the horizontal position of the sprinkler head 3 can be known according to the change in the length of the rope retraction and extension. A position sensor component can also be set to monitor the rotation angle and horizontal displacement.

[0069] Example 3

[0070] The radioactive tank elution system of this embodiment is as follows: Fig.11 As shown, it includes a storage tank to be treated, a feed pipe 7, a circulation pump 8, a pipeline 9, and the spray decontamination device for radioactive storage tanks in Example 1 or Example 2. The spray decontamination device for radioactive storage tanks is installed on the upper platform of the storage tank to be treated, and the actuator 2 carrying the spray head 3 and the spray hose 4 is inserted into the storage tank to be treated. The feed pipe 7 penetrates into the interior of the storage tank to be treated. The circulation pump 8 is installed at the bottom of the storage tank to be treated and is connected to the inlet of the spray hose 4 of the spray decontamination device for radioactive storage tanks through the pipeline 9. The pipeline 9 is provided with a filter 91, a first electromagnetic valve 92 and a flow meter 94. The pipeline 9 is provided with a branch directly leading to the storage tank to be treated at the filter 91, and a second electromagnetic valve 93 is provided on the branch. In order to prevent the residues generated during the circulation cleaning process from entering the narrow inner cavity of the spray head and causing blockage, this embodiment is provided with a branch directly leading to the storage tank to be treated in the filter 91 and is equipped with a second electromagnetic valve 93. When the filter 91 needs to be cleaned, the first electromagnetic valve 92 of the circulating spray main line is closed, and the second electromagnetic valve 93 of the branch line is opened to rinse the filter. After cleaning, the second electromagnetic valve 93 of the branch line is closed, and the first electromagnetic valve 92 of the spray line is opened to continue the circulating spraying operation.

[0071] During the specific implementation process, the operator can operate the crane to lift the radioactive tank spray decontamination device to the upper platform of the radioactive tank located in the spray equipment installation area. Install the circulation pump 8 at the bottom of the tank, install the filter 91 on the upper platform, and extend the actuators 2 such as the spray head 3, spray rod, and flex arm into the tank body. Inject the spray reagent with a liquid level height of 300mm into the tank body, operate the control unit, set the vertical distance between the spray head position and the top of the large tank to "1m", start the coil drive motor, the coil turntable rotates, the hose is gradually lowered, and the spray head 3 stops at a position 1m below the top of the large tank. Set the pressure of the spray head 3 to 5bar, turn on the circulation pump 8, the pressure of the spray circulation pump reaches the set pressure, and the decontamination liquid is sprayed out from the spray head. During the tank spraying process, the spraying agent is transported to the filter 91 on the top of the tank by the circulating pump 8. The filter 91 provided on the pipeline 9 filters the impurities in the decontamination liquid. After filtration, the decontamination liquid is transported to the spray head 3 of the spray decontamination device and sprayed out through the spray head 3 to achieve decontamination. After the decontamination liquid is sprayed onto the tank wall and the surface of the coil, it finally converges to the bottom of the tank and is transported to the filter 91 on the top of the tank again by the circulating pump 8 to achieve cyclic spraying.

[0072] Example 4

[0073] The radioactive tank elution method of this embodiment adopts the radioactive tank elution system in Embodiment 3, and the method comprises the following steps:

[0074] Lift and install the radioactive tank spray decontamination device onto the upper platform of the tank to be treated;

[0075] Install the circulation pump 8 at the bottom of the storage tank to be treated;

[0076] Insert the spray head 3, the spray hose 4 and the actuator 2 into the storage tank to be treated;

[0077] Inject decontamination liquid into the storage tank to be treated through the feed pipe 7 until the liquid level required by the circulation pump 8 is reached;

[0078] The circulation pump 8 supplies the decontamination liquid to the shower head 3 through the pipeline 9 to realize the circulation decontamination elution.

[0079] This embodiment is equivalent to providing a method for spraying decontamination of radioactive storage tanks, and the system adopted by the method is roughly composed of a spraying decontamination device and a circulation and filtration system.

[0080] In combination with the device in Example 2, the specific implementation process of the method may be:

[0081] The above equipment is hoisted to the top of the storage tank. Specifically, the circulating pump 8 is hoisted to the bottom of the large tank by a crane. The radioactive storage tank spray decontamination device is fixed on the upper part of the equipment room at the top of the large tank. The spray head 3, spray rod, flex arm and other actuators 2 are extended into the tank body, and the decontamination reagent is injected into the tank until the liquid level in the tank reaches the minimum liquid level requirement for the operation of the circulating pump 8. The circulating pump 8 transports the decontamination reagent at the bottom of the tank to the filter 91 through the pipeline 9. The filter 91 set on the pipeline 9 can filter impurities in the circulating decontamination reagent. The decontamination liquid is filtered by the filter 91 and then transported to the spray head 3 of the spray decontamination device. The control unit controls the spray head 3 to spray, and the decontamination cycle is realized.

[0082] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A radioactive tank spray decontamination device, characterized in that: The invention comprises a driving mechanism (1), an actuator (2), a spray head (3) and a spray hose (4). The driving mechanism (1) is installed on a storage tank to be treated. The actuator (2) comprises an insertion portion (21), an extension portion (22) and a transmission portion (23); one end of the insertion portion (21) is connected to the driving mechanism (1) as a first connection end, and the other end is used as an insertion end for inserting into the interior of the storage tank to be treated. One end of the extension part (22) is movably connected to the insertion end of the insertion part (21) as a second connection end, and the other end is used as an extension end to extend in the circumferential direction of the insertion end. One end of the transmission part (23) is connected to the driving mechanism (1), and the other end is connected to the extension part (22), so that under the drive of the driving mechanism (1), the relative angle between the extension direction of the extension part (22) and the insertion direction of the insertion part (21) can be adjusted; The spray hose (4) is movably connected to the probing portion (21) and the extending portion (22), and the end probing into the storage tank to be treated is connected to the spray head (3) to transport the decontamination liquid to the spray head (3).

2. The radioactive tank spray decontamination device according to claim 1, characterized in that: The probe portion (21) is a cylindrical member. The transmission part (23) is a flexible traction rope (231), which is inserted into an empty area in the insertion part (21), one end of which is connected to the driving mechanism (1), and the other end of which passes through the insertion part (21) at a set distance from the insertion end and is connected to the extension end of the extension part (22), so as to traction and drive the extension part (22) to move under the drive of the driving mechanism (1).

3. The radioactive tank spray decontamination device according to claim 2, characterized in that: The driving mechanism (1) comprises a mounting platform (11) and an electric cylinder (12). The first connection end of the probe portion (21) is connected to the bottom surface of the mounting platform (11). The electric cylinder (12) is mounted on the top surface of the mounting platform (11). The top end of the traction rope (231) passes through the mounting platform (11) and is wound around the output end of the electric cylinder (12).

4. The radioactive tank spray decontamination device according to claim 1, characterized in that: The transmission part (23) is a transmission rod (232), and the transmission rod (232) includes a connecting rod (2321) and a rocker rod (2322). The connecting rod (2321) is arranged parallel to the insertion portion (21) and is axially movably connected to one side of the insertion portion (21), one end of which is connected to the driving mechanism (1) and the other end of which is hingedly connected to one end of the swing rod (2322). One side of the second connecting end of the extension portion (22) is hingedly connected to the insertion end of the insertion portion (21), and the side opposite to the hinged side is hingedly connected to the other end of the swing rod (2322), so that the connecting rod (2321) drives the swing rod (2322) to push the extension portion (22) to move around the hinged side under the drive of the driving mechanism (1).

5. The radioactive tank spray decontamination device according to claim 4, characterized in that: The driving mechanism (1) comprises a mounting platform (11) and an axial driving member (14); a first connecting end of the probe portion (21) is connected to the bottom surface of the mounting platform (11); The axial driving member (14) is mounted on the top surface of the mounting platform (11). The top end of the transmission rod (232) passes through the mounting platform (11) and is connected to the output end of the axial driving member (14).

6. The radioactive tank spray decontamination device according to claim 3 or 5, characterized in that: The invention also comprises a rotary mechanism (5), wherein the rotary mechanism (5) comprises a rotary motor (51), a rotary gear (52), a guide cylinder (53) and a gear ring (54). The outer portion of the mounting platform (11) is sleeved with a gear ring (54), and the gear ring (54) is meshedly connected with the rotary gear (52). The driving end of the rotary motor (51) is connected to the rotary gear (52) to drive the rotary gear (52) to drive the gear ring (54), so that the mounting platform (11) drives the insertion part (21) and the extension part (22) to follow; The guide cylinder (53) is covered on the outside of the mounting platform (11), and the rotary motor (51) is mounted on the guide cylinder (53).

7. The radioactive tank spray decontamination device according to claim 3 or 5, characterized in that: It also includes a rotating mechanism (5), wherein the rotating mechanism (5) includes a lock (56). The driving mechanism (1) further comprises a connecting tube (15), wherein the connecting tube (15) is fixedly connected to the storage tank to be treated, and the mounting platform (11) penetrates and is rotatably connected to the connecting tube (15) to drive the probe portion (21) and the extension portion (22) to follow the movement. The lock buckle (56) is connected between the connecting tube (15) and the mounting platform (11) in an opening and closing manner, and is used to lock the mounting platform (11) at a set angle position.

8. The radioactive tank spray decontamination device according to claim 1, characterized in that: The probe portion (21) is a cylindrical member. The spray hose (4) passes through the vacant area in the probe portion (21), is placed on the extension portion (22), and is connected to the spray head (3) at the end close to the extension end. The extension portion (22) is provided with at least two limiting strips (222) arranged on a vertical plane to limit the position of the spray hose (4).

9. The radioactive tank spray decontamination device according to claim 1, characterized in that: The device also includes a lifting mechanism (6), wherein the lifting mechanism (6) includes a rotating disk (61), a driving motor (62) and a bracket (63). The support (63) is installed on the upper platform of the storage tank to be treated. The rotating disk (61) is rotatably connected to the bracket (63). The driving motor (62) is connected to the bracket (63), and the driving end is connected to the rotating shaft of the rotating disk (61), and is used to drive the rotating disk (61) to rotate. The top end of the spray hose (4) passes through the driving mechanism (1) and is wound on the rotating disk (61).

10. The radioactive tank spray decontamination device according to claim 9, characterized in that: The lifting mechanism (6) further comprises a guide wheel (64), The support (63) is provided with a guide portion (631) located directly above the driving mechanism (1), and the guide wheel (64) is rotatably connected to the guide portion (631). The top end of the spray hose (4) is turned by the guide wheel (64) and then wound on the rotating disk (61).

11. The radioactive tank spray decontamination device according to claim 1, characterized in that: It also comprises a control unit, which is electrically connected to the driving mechanism (1) and is used to control the driving mechanism (1) so that the shower head (3) reaches a specified height position.

12. A radioactive tank elution system, characterized in that: It comprises a storage tank to be treated, a feed pipe (7), a circulation pump (8), a pipeline (9) and a radioactive storage tank spray decontamination device as claimed in any one of claims 1 to 11, The radioactive tank spray decontamination device is installed on the upper platform of the tank to be treated, and the actuator (2) carrying the spray head (3) and the spray hose (4) is inserted into the tank to be treated. The feed pipe (7) penetrates into the interior of the storage tank to be treated. The circulation pump (8) is installed at the bottom of the storage tank to be treated and connected to the inlet of the spray hose (4) of the radioactive storage tank spray decontamination device through a pipeline (9). The pipeline (9) is provided with a filter (91), a first electromagnetic valve (92) and a flow meter (94); the pipeline (9) is provided with a branch line directly leading to the storage tank to be treated at the filter (91); and the branch line is provided with a second electromagnetic valve (93).

13. A method for eluting a radioactive storage tank, characterized in that: Using the radioactive tank elution system according to claim 12, the method comprises the following steps: The radioactive tank spray decontamination device is hoisted and installed on the upper platform of the tank to be treated; Installing a circulation pump (8) at the bottom of the storage tank to be treated; Insert the spray head (3), the spray hose (4) and the actuator (2) into the storage tank to be treated; Injecting decontamination liquid into the storage tank to be treated through the feed pipe (7) until the liquid level required by the circulation pump (8) is reached; The circulation pump (8) supplies the decontamination liquid to the shower head (3) through the pipeline (9), thereby realizing the circulation decontamination elution.

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