Feeding device of sedimentation centrifuge and sedimentation centrifuge system

Abstract

According to the feeding device of the sedimentation centrifuge and the sedimentation centrifuge system, a first pipe section and a second pipe section in the feeding device are arranged in a spaced mode, a butt-joint opening is formed in one end of the second pipe section and located above a rotary drum, the other end of the second pipe section downwards stretches into the rotary drum, the butt-joint opening right faces a pipe opening of the first pipe section, and the butt-joint opening is located above the rotary drum. The first pipe section is located on the outer side of the rotary drum. The movable feeding pipe is located between the first pipe section and the second pipe section, the central axis of the movable feeding pipe and the central axis of the first pipe section are located on the same extension line, the first pipe section is sleeved with the first end of the movable feeding pipe, the second end of the movable feeding pipe directly faces the butt joint opening, and the movable feeding pipe can move in the axial direction of the first pipe section. And further, the second end of the movable feeding pipe is jointed with / separated from the butt joint port. According to the feeding device, rapid dismounting and hoisting can be achieved, and then a channel is reserved for maintenance or replacement of the rotary drum.

Description

Technical Field

[0001] The invention particularly relates to a feeding device of a sedimentation centrifuge and a sedimentation centrifuge system. Background Art

[0002] In the nuclear fuel reprocessing project, the decanter centrifuge is one of the key equipment in the head-end processing system of spent fuel reprocessing. In the nuclear fuel reprocessing project, since the materials processed by the decanter centrifuge are highly radioactive, the decanter centrifuge needs to be installed in a closed chamber to avoid leakage of radioactive atmosphere.

[0003] At present, the sedimentation centrifuge used in nuclear fuel reprocessing projects includes a drum and a feeding device. The opening of the drum faces upward, and the pipe of the feeding device is fixedly installed in a closed chamber and located above the drum. The pipe of the feeding device extends downward into the drum to feed the drum. The drum rotates to achieve sedimentation and separation of materials.

[0004] Since the drum of the decanter centrifuge needs to rotate at high speed, it is a vulnerable part and needs to be repaired and replaced regularly. During the drum replacement process, the staff needs to lift the drum out of the closed chamber from above for repair or replacement. However, the existing feeding device is located above the drum and cannot be quickly disassembled, resulting in the drum being unable to be quickly removed, which affects the repair and replacement of the drum below. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a feeding device of a sedimentation centrifuge and a sedimentation centrifuge system in view of the above-mentioned deficiencies in the prior art. The feeding device can facilitate the maintenance and replacement of the drum.

[0006] According to an embodiment of the first aspect of the present invention, a feeding device for a sedimentation centrifuge is provided, which is used to feed the drum of the sedimentation centrifuge, and the device includes: a fixed feeding pipe and a mobile feeding pipe. The fixed feeding pipe includes a first pipe section and a second pipe section, and the first pipe section and the second pipe section are arranged at intervals. The first pipe section is located outside the drum, and one end of the second pipe section is provided with a docking port, which is located above the drum, and the other end of the second pipe section extends downward into the drum, and the docking port is opposite to the pipe mouth of the first pipe section. The mobile feeding pipe is located between the first pipe section and the second pipe section, and the central axis of the mobile feeding pipe is on the same extension line as the central axis of the first pipe section. One end of the mobile feeding pipe is sleeved on the first pipe section, and the other end is opposite to the docking port. The mobile feeding pipe can move along the axial direction of the first pipe section, so that the second end of the mobile feeding pipe is engaged / disengaged with the docking port. When the movable feed pipe is engaged with the docking port, the first pipe section transports materials into the drum through the movable feed pipe and the second pipe section. When the movable feed pipe is disengaged from the docking port, a maintenance passage for lifting the drum upward can be left open.

[0007] Preferably, the second pipe section includes a bending section and a guide section, the bending section is located above the guide section, one end of the bending section is connected to the docking port, and the other end is connected to the guide section, the bending section is connected to the upper end of the drum, and the guide section extends in a vertical direction, and a discharge port is provided at the lower end of the guide section, and the discharge port faces the inner wall of the drum.

[0008] Preferably, the first pipe section is located higher than the second pipe section, and the first pipe section and the movable feed pipe are both inclined, and the position of the end of the movable feed pipe facing away from the docking port is higher than the position of the end facing the docking port.

[0009] Preferably, the device further comprises a driving unit, which is connected to the movable feed pipe and is used to drive the movable feed pipe to move along the central axis direction of the first pipe section, thereby enabling the movable feed pipe to engage with / disengage from the docking port.

[0010] The driving unit includes a driving source and a connecting rod assembly. The connecting rod assembly includes an active rod, a driven rod and a bracket. The two ends of the active rod are respectively a first end and a second end. The first end of the active rod is hinged to the bracket, the second end of the active rod is hinged to one end of the driven rod, and the other end of the driven rod is hinged to the movable feed pipe. The driving source is connected to the middle part of the active rod, and is used to drive the active rod to rotate around the hinge shaft of its first end, thereby driving the movable feed pipe to move along the central axis direction of the first pipe section.

[0011] Preferably, the first end of the active rod is hinged to the lower end of the bracket, and the position of the first end of the active rod is lower than the position of the first pipe segment.

[0012] Preferably, a waist-shaped hole is provided in the middle of the active rod, the waist-shaped hole extends along the length direction of the active rod, a slider is passed through the waist-shaped hole, the slider can slide along the extension direction of the waist-shaped hole, and the driving source is connected to the slider.

[0013] Preferably, the driving unit further comprises a driving rod, and the driving rod extends in a vertical direction. The driving source is located above the connecting rod assembly, the upper end of the driving rod is connected to the driving source, and the lower end is hinged to the slider, and the driving source is used to drive the driving rod to move in a vertical direction, thereby driving the active rod to rotate around the hinge shaft at its first end.

[0014] Preferably, the position height of the first end of the active rod is lower than the position height of the second end thereof.

[0015] Preferably, the docking port is flared.

[0016] According to an embodiment of the second aspect of the present invention, there is provided a decanter centrifuge system, comprising: a rotary drum and the above-mentioned decanter centrifuge feeding device. The second pipe section of the fixed feed pipe of the decanter centrifuge feeding device extends downward into the rotary drum, and the decanter centrifuge feeding device is used to transport the radioactive slag-containing liquid to be separated by sedimentation into the rotary drum.

[0017] Preferably, the system further comprises an outer sleeve and a shielding member, wherein a first cavity and a second cavity are arranged in the outer sleeve, wherein the first cavity is located outside the second cavity, and the first cavity is connected to the upper end of the second cavity. The first pipe section of the feeding device of the sedimentation centrifuge is located in the first cavity, the second pipe section is located in the second cavity, and the drum is located in the second cavity and below the second pipe section. The shielding member is installed at the upper end of the outer sleeve, and is used to seal the first cavity and the second cavity to prevent leakage of radioactive aerosols in the first cavity and the second cavity.

[0018] The feeding device of the sedimentation centrifuge in the present invention combines a fixed feed pipe with a mobile feed pipe, so that the mobile feed pipe and the second pipe section of the fixed feed pipe can be quickly disassembled. When it is necessary to convey materials to the drum, the mobile feed pipe is moved to engage with the docking port. At this time, the first pipe section conveys materials to the drum through the mobile feed pipe and the second pipe section. When the drum needs to be repaired or replaced, the mobile feed pipe can be disengaged from the docking port, and the mobile feed pipe can be retracted into the first cavity. In this way, the mobile feed pipe and the second pipe section can be quickly disassembled, thereby clearing a passage for the repair or replacement of the drum. Moreover, the second pipe section is fixedly installed on the drum. When the drum needs to be repaired, the drum and the second pipe section can be directly lifted out of the second cavity together, thereby completing the rapid repair or replacement of the drum.

[0019] Furthermore, the feeding device controls the free extension and retraction of the mobile feed pipe relative to the first pipe section by lifting the driving rod, driving the active rod to rotate, and then pushing the driven rod, thereby realizing the engagement / disengagement of the feed pipe, thereby facilitating the replacement of the drum of the positive cup centrifuge below the feeding device. The first pipe section is installed in the first cavity. After the mobile feed pipe is disengaged from the second pipe section, the mobile feed pipe is retracted into the first cavity, thereby making way for the maintenance passage of the drum. By lifting the drum and the second pipe section as a whole, the drum can be quickly repaired and replaced. Therefore, the feeding device of the sedimentation centrifuge can be quickly disassembled, thereby making way for the maintenance or replacement of the drum, thereby facilitating the maintenance and replacement of the drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of a feeding device of a decanter centrifuge in some embodiments of the present invention;

[0021] Figure 2 is a schematic diagram of the working process of the connecting rod assembly in some embodiments of the present invention;

[0022] Figure 3 Schematic diagram of the structure of the decanter centrifuge system in some embodiments of the present invention.

[0023] In the figure: 1-driving rod (lifting rod), 2-first pipe section (fixed feed pipe one), 3-bracket, 4-active rod, 41-waist-shaped hole, 5-driven rod, 6-movable feed pipe, 7-outer sleeve, 8-second pipe section (fixed feed pipe two), 81-docking port, 82-bending section, 83-guide section, 9-(fixed) shielding member, 10-first cavity, 11-second cavity, 12-rotating drum, 13-shielding plug, 14-rotating shaft. DETAILED DESCRIPTION

[0024] 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.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "upstream", "downstream" 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.

[0026] 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.

[0027] 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.

[0028] First of all, it should be noted that in the nuclear fuel reprocessing project, the decanter centrifuge is one of the key equipment in the head-end processing system of spent fuel reprocessing. Since the materials processed by the decanter centrifuge are radioactive, and the frame system and transmission system are vulnerable parts, they need to be regularly repaired and replaced, especially the drum component of the centrifuge. The decanter centrifuge is divided into an inverted cup decanter centrifuge and a positive cup decanter centrifuge according to the opening direction of the drum. For the positive cup centrifuge, its feeding device is located above the drum, which will affect the maintenance and replacement of the lower drum. Therefore, it is particularly important to optimize the design of the feeding mechanism of the positive cup centrifuge. Therefore, the feeding device of the decanter centrifuge in the present invention is particularly suitable for feeding the positive cup centrifuge.

[0029] In nuclear fuel reprocessing projects, sedimentation centrifuges are mainly used to perform sedimentation centrifugal operations on radioactive slag-containing liquid. In order to avoid the problem of radioactive aerosol leakage, the drum needs to be set inside a sealed shielded chamber. When disassembling and repairing the drum, workers usually need to lift the drum out of the shielded chamber from above. The feeding device usually needs to be set in this sealed shielded chamber. The existing feeding device uses an integrated feeding pipe, which extends from the opening at the upper end of the drum of the positive cup centrifuge, that is, the drum is located below the feeding pipe. Therefore, the structural design of the existing feeding device makes it difficult to lift the drum out easily.

[0030] Example 1

[0031] See also Figure 1 and Figure 2 The present invention discloses a feeding device for a sedimentation centrifuge, which is used to feed the drum 12 of the sedimentation centrifuge, including: a fixed feeding pipe and a movable feeding pipe 6.

[0032] The fixed feed pipe includes a first pipe section 2 and a second pipe section 8, and the first pipe section 2 and the second pipe section 8 are arranged at intervals. The first pipe section 2 is located outside the drum 12, and one end of the second pipe section 8 is provided with a docking port 81, which is located above the drum 12. The other end of the second pipe section 8 extends downward into the drum, and the docking port 81 faces the pipe opening of the first pipe section 2. The mobile feed pipe 6 is located between the first pipe section 2 and the second pipe section 8, and the central axis of the mobile feed pipe 6 is on the same extension line as the central axis of the first pipe section 2. One end of the mobile feed pipe 6 is sleeved on the first pipe section 2, and the other end faces the docking port 81. The mobile feed pipe 6 can move along the axial direction of the first pipe section 2, so that the second end of the mobile feed pipe 6 is engaged / disengaged with the docking port 81. When the mobile feed pipe 6 is engaged with the docking port 81, the first pipe section 2 transports materials into the drum through the mobile feed pipe 6 and the second pipe section 8. When the mobile feed pipe 6 is disengaged from the docking port 81, a maintenance passage for lifting the drum upward can be made available.

[0033] It should be noted that the device further includes a feeding unit (not shown in the figure), which is connected to the first pipe section 2 of the fixed feed pipe and is used to feed the first pipe section 2 .

[0034] In addition, for ease of understanding, the installation environment of the sedimentation centrifuge is explained. For the treatment of highly radioactive liquid, it is necessary to implement it in a shielded chamber, which is composed of a first cavity 10 and a second cavity 11. The first cavity 10 is outside the second cavity 11, and the first cavity 10 is connected to the upper end of the second cavity 11. The first pipe section 2 of the feeding device of the sedimentation centrifuge is located in the first cavity 10, the second pipe section 8 is located in the second cavity 11, and the drum is located in the second cavity 11 and below the second pipe section 8. If it is an existing feeding pipe, the right end of the feeding pipe will penetrate the right side wall of the first cavity 10, and the left end of the feeding pipe will directly extend into the drum 12, which makes it inconvenient to disassemble the existing feeding pipe. For a hard feeding pipe, the staff can only saw off the feeding pipe first and then take out the drum 12. Especially when the shielded chamber is in a highly radioactive environment, the staff cannot directly cut and disassemble the feeding pipe therein.

[0035] For further information, see Figure 1 The first cavity 10 and the second cavity 11 are both arranged in the outer sleeve, and a shielding member is installed at the upper end of the outer sleeve, which is used to seal the first cavity 10 and the second cavity 11. In other words, the outer sleeve is an inclusive cavity, so that all equipment components below the shielding member are isolated from the equipment room (the equipment room is the space above the shielding member, which is a low-radioactive space, and the space inside the outer sleeve is a low-radioactive space). Figure 1 As shown, the first pipe section 2 passes through the right side wall of the outer sleeve, the second pipe section 8 is fixed to the upper end of the drum 12, and the movable feed pipe 6 is accommodated in the outer sleeve.

[0036] like Figure 3 As shown, the shielding member 9 is provided with an installation opening, in which a shielding plug 13 is installed, a rotating shaft 14 of the sedimentation centrifuge passes through the shielding plug 13, and the lower end of the rotating shaft 14 is connected to the drum 12. When the drum 12 needs to be disassembled, it is only necessary to lift the shielding plug 13, the rotating shaft 14, the drum 12 and the second pipe section 8 out of the shielding cavity together to complete the quick disassembly of the drum 12.

[0037] Specifically, the driving unit drives the mobile feed pipe 6 to move along the central axis of the first pipe section 2, specifically, to move in a direction away from the second pipe section 8, so that the mobile feed pipe 6 is disengaged from the second pipe section 8. After the mobile feed pipe 6 is disengaged from the second pipe section 8, it is retracted onto the first pipe section 2, so that the second pipe section 8, the mobile feed pipe 6 and the first pipe section 2 can be quickly disassembled. Since the first pipe section 2 is fixedly installed in the first cavity 10 of the outer sleeve 7, at this time, the staff can remove the shielding plug 13, and lift the shielding plug 13, the rotating shaft 14, the rotating drum 12 and the second pipe section 8 out of the shielding cavity together, so as to complete the rapid disassembly of the rotating drum 12.

[0038] In this embodiment, by arranging the first pipe section 2 and the movable feed pipe 6 in the outer sleeve 7, the movable feed pipe 6 and the first pipe section 2 can be quickly disassembled and lifted, thereby making way for the maintenance or replacement of the drum 12.

[0039] The feeding device of the sedimentation centrifuge can realize the rapid disassembly between the mobile feed pipe 6 and the second pipe section 8 of the fixed feed pipe by combining the fixed feed pipe and the mobile feed pipe 6. When it is necessary to convey materials to the rotary drum 12, the mobile feed pipe 6 is moved to engage with the docking port 81. At this time, the first pipe section 2 conveys materials to the rotary drum 12 through the mobile feed pipe 6 and the second pipe section 8. When it is necessary to repair or replace the rotary drum 12, the mobile feed pipe 6 can be disengaged from the docking port 81, and the mobile feed pipe 6 can be retracted into the first cavity 10. In this way, the mobile feed pipe 6 and the second pipe section 8 can be quickly disassembled, thereby making way for the repair or replacement of the rotary drum 12.

[0040] Moreover, the second pipe section 8 is connected to the drum 12 . When the drum 12 needs to be repaired, the drum 12 and the second pipe section 8 can be directly lifted out of the second cavity 11 , thereby completing the rapid repair or replacement of the drum 12 .

[0041] Furthermore, the feeding device drives the active rod 4 to rotate through the driving unit, and then controls the mobile feed pipe 6 to freely extend and disengage by pushing the driven rod 5, so as to realize the engagement / disengagement of the feed pipe (i.e., the mobile feed pipe 6 and the second pipe section 8), thereby facilitating the replacement of the centrifuge drum 12 below the feeding device. The first pipe section 2 is installed in the first cavity 10. After the mobile feed pipe 6 is disengaged from the second pipe section 8, the mobile feed pipe 6 is retracted into the first cavity 10, so that the maintenance channel of the drum 12 can be made available. By hoisting the drum 12 and the second pipe section 8 as a whole, the drum 12 can be quickly repaired and replaced.

[0042] In addition, the diameter of the mobile feed pipe 6 is larger than the diameter of the first pipe section 2 of the fixed feed pipe, so that the first pipe section 2 can be partially inserted into the mobile feed pipe 6. Moreover, the first pipe section 2 also plays a guiding role, that is, guiding the mobile feed pipe 6 to move along the central axis direction of the first pipe section 2.

[0043] Therefore, the feeding device of the sedimentation centrifuge can be quickly disassembled and hoisted, thereby making way for the maintenance or replacement of the drum 12, that is, the drum 12 can be conveniently lifted vertically out of the hoisting channel (second cavity 11).

[0044] See also Figure 3In some embodiments, the second pipe section 8 includes a bending section 82 and a guide section 83. The bending section 82 is located above the guide section 83, one end of the bending section 82 is connected to the docking port 81, and the other end is connected to the guide section 83, and the bending section 82 is connected to the upper end of the drum. The guide section 83 extends in the vertical direction, and a discharge port is provided at the lower end of the guide section 83, and the discharge port faces the inner side wall of the drum 12.

[0045] It should be noted that, in the present embodiment, the discharge port faces the inner wall of the drum 12. When the radioactive liquid enters the drum 12, the drum 12 rotates so that the liquid is evenly distributed in the drum 12. Moreover, the bending section 82 and the guide section 83 of the second pipe section 8 can prevent the slag-containing radioactive liquid from affecting the balance and stability of the rotating shaft 14.

[0046] Furthermore, in the feeding device, the position of the first pipe section 2 is higher than the second pipe section 8, the first pipe section 2 of the fixed feed pipe and the mobile feed pipe 6 are both inclined, the position of the end of the first pipe section 2 and the mobile feed pipe 6 facing away from the docking port 18 is higher than the position of the end facing the docking port 18, and the slope of the central axis of the first pipe section 2 and the mobile feed pipe 6 is not greater than 2%, so that the centrifuge shaft system will not be too long while ensuring the flow of materials.

[0047] Specifically, the centrifuge shaft system is the rotating shaft 14 of the sedimentation centrifuge. Figure 3 As shown, the sedimentation centrifuge also includes a driving motor and a rotating shaft 14. The driving motor is located directly above the shielding chamber. The driving motor is connected to the drum 12 through the rotating shaft 14, and the rotating shaft 14 runs through the top wall of the shielding chamber. The driving motor drives the drum 12 to rotate through the rotating shaft 14. If the slope of the central axis of the first pipe section 2 and the mobile feed pipe 6 is too large, the length of the rotating shaft 14 will increase, which will cause the drum 12 to generate greater vibration during the rotation process, thereby affecting the stability of the sedimentation separation.

[0048] The feeding device also includes a driving unit, which is connected to the mobile feeding pipe 6 and is used to drive the mobile feeding pipe 6 to move along the central axis direction of the first pipe section 2, thereby enabling the mobile feeding pipe 6 to engage with / disengage from the docking port 81.

[0049] Further, the driving unit includes a driving source and a connecting rod assembly. The driving source is located above the first cavity 10. The connecting rod assembly is accommodated in the first cavity 10, one end of the connecting rod assembly is connected to the middle of the movable feed pipe 6, and the other end is connected to the inner wall of the top of the first cavity 10. The driving unit is connected to the connecting rod assembly, and the driving unit is used to drive the movable feed pipe 6 to move along the central axis direction of the first pipe section 2 through the connecting rod assembly.

[0050] Specifically, the driving unit drives the mobile feed pipe 6 to engage / disengage with the second pipe section 8 through the connecting rod assembly, which has the advantage that the driving source of the driving unit can be arranged outside the shielding member 9, and the connecting rod assembly can be driven only by the driving rod 1. In this way, the driving source can be prevented from being contaminated by the highly radioactive aerosol inside the accommodating cavity.

[0051] In some other embodiments, the driving unit may be directly disposed in the accommodating cavity to directly drive the movable feeding pipe 6 to move along the axial direction of the first pipe section 2. However, the driving unit disposed in this way is easily contaminated by the highly radioactive aerosol emitted by the material, which affects the control accuracy of the driving unit.

[0052] In this embodiment, the connecting rod assembly includes an active rod 4, a driven rod 5 and a bracket 3. The bracket 3 is located in the first cavity 10, and the bracket 3 extends in the vertical direction. The two ends of the active rod 4 are respectively a first end and a second end, the first end of the active rod 4 is hinged to the bracket 3, the second end is hinged to one end of the driven rod 5, and the other end of the driven rod 5 is hinged to the movable feed pipe 6. The driving source is connected to the middle part of the active rod 4, and is used to drive the active rod 4 to rotate around the hinge axis of its first end, thereby driving the movable feed pipe 6 to move along the central axis direction of the first pipe section 2.

[0053] like Figure 2 As shown, the driving unit drives the active rod 4 to rotate around the hinge axis at the first end. When the active rod 4 rotates forward (i.e., counterclockwise) around the hinge axis at the first end, its second end pushes the driven rod 5, and then the driven rod 5 pushes the mobile feed pipe 6 to move toward the docking port 81 of the second pipe section 8 close to the fixed feed pipe, and finally, the mobile feed pipe 6 is engaged with the docking port 81 of the second pipe section 8.

[0054] Figure 2 In the figure, the direction of the rotating arrow on the active rod 4 represents the reverse rotation (i.e., clockwise) of the active rod 4. When the active rod 4 rotates reversely around the hinge axis at the first end, its second end pulls the driven rod 5, and then the driven rod 5 pulls the movable feed pipe 6 to move away from the second pipe section 8 of the fixed feed pipe, and finally, the movable feed pipe 6 is disengaged from the docking port 81 of the second pipe section 8.

[0055] Furthermore, a waist-shaped hole 41 is provided in the middle of the active rod 4, and the waist-shaped hole 41 extends along the length direction of the active rod 4. A slider is passed through the waist-shaped hole 41, and the slider can slide along the extension direction of the waist-shaped hole 41, and the driving source is connected to the slider.

[0056] Furthermore, the driving unit further includes a driving rod 1, which extends in the vertical direction and passes through the top wall of the first cavity 10, and the lower end of the driving rod 1 is accommodated in the second cavity 11. The driving source is located above the connecting rod assembly, the upper end of the driving rod 1 is connected to the driving source, and the lower end is hinged to the slider, and the driving source is used to drive the driving rod 1 to move in the vertical direction, thereby driving the active rod 4 to rotate around the hinge axis of its first end.

[0057] The driving source of the driving unit may be a driving motor, a cylinder, an electric cylinder, etc. In this embodiment, a driving motor is selected as the driving source, and a commercially available linear motor may be used. In this embodiment, by arranging the driving motor outside the accommodating cavity, specifically above the shielding body, it is possible to prevent the highly radioactive aerosol inside the accommodating cavity from contaminating the driving motor.

[0058] The driving motor drives the driving rod 1 to move up and down. When the driving rod 1 moves downward, it drives the active rod 4 to rotate in the counterclockwise direction around the hinge axis at the first end, and then pushes the mobile feed pipe 6 to move toward the docking port 81 of the second pipe section 8 close to the fixed feed pipe through the driven rod 5, and finally, the mobile feed pipe 6 is engaged with the docking port 81 of the second pipe section 8. When the driving rod 1 moves upward, it drives the active rod 4 to rotate in the clockwise direction around the hinge axis at the first end, and then pulls the mobile feed pipe 6 to move away from the second pipe section 8 of the fixed feed pipe through the driven rod 5, and finally, the mobile feed pipe 6 is disengaged from the docking port 81 of the second pipe section 8.

[0059] The first end of the active rod 4 is hinged to the lower end of the bracket 3, and the position of the first end of the active rod 4 is lower than the position of the first pipe section 2. In addition, the position of the first end of the active rod 4 is lower than the position of its second end.

[0060] In the present embodiment, since the central axes of the fixed feed pipe and the movable feed pipe 6 are inclined upward, that is, the position heights of the ends of the first pipe section 2 and the movable feed pipe 6 close to the drum 12 are lower than the position heights of the ends away from the drum 12, therefore, by setting the first end of the active rod 4 at a lower position and the second end at a higher position, the space of the first cavity 10 can be effectively saved, and the problem of the centrifuge shaft system being too long can be further avoided.

[0061] See also Figure 1 As shown, in some embodiments, the docking port 81 is flared. Specifically, the diameter of the flared portion of the docking port 81 is larger than the diameter of the mobile feed pipe 6, so that the mobile feed pipe 6 can be easily engaged with the docking port 81 of the second pipe section 8.

[0062] The connecting rod assembly used in this embodiment has a simple structure and a reliable running trajectory. There is no need to consider the problem of reduced electronic control accuracy caused by a highly radioactive atmosphere. It is suitable for processing materials in nuclear fuel reprocessing projects.

[0063] The following is a further description of the feeding device of the decanter centrifuge in this embodiment.

[0064] The present embodiment provides a feeding device applicable to a positive cup sedimentation centrifuge. The feeding device can smoothly feed the materials and can also be retracted and disengaged from the sliding feed pipe at any time to achieve overall hoisting of the feeding device and make way for replacement of the centrifuge drum 12.

[0065] In order to achieve the above purpose, the technical solution adopted by the feeding device is as follows:

[0066] A crank-connecting rod disengagement feeding device, which is composed of a fixed feed pipe 1 (i.e. a first pipe section 2 of the fixed feed pipe), a fixed sleeve, a lifting rod (i.e. a driving rod 1), a bracket 3, an active rod 4, a driven rod 5, a movable feed pipe 6, a fixed feed pipe 2 (i.e. a second pipe section 8 of the fixed feed pipe), etc.

[0067] The fixed feed pipe 1 (i.e., the first pipe section 2 of the fixed feed pipe) is fixed on the outer sleeve 7, the outer sleeve 7 is fixed on the fixed shielding component 9, the fixed feed pipe is fixed on the outer sleeve 7, and the mobile feed pipe 6 is slidable between the fixed feed pipe 1 and the fixed feed pipe 2 through the driven rod 5 fixed above it and the bracket 3 fixed below the shielding component, and the driven rod 5 is controlled by the lifting rod (i.e., the driving rod 1). When the centrifuge is working, the active rod 4 is pushed by the lifting rod to rotate with the bracket 3 as the center, and the driven rod 5 is pushed to make the mobile feed pipe 6 slide into the fixed feed pipe 2, and the feeding mechanism is in an engaged state.

[0068] When the centrifuge drum 12 needs to be hoisted for maintenance, it is necessary to clear the passage and disengage the mobile feed pipe 6. The lifting rod can be lifted to make the active rod 4 rotate in the opposite direction, and the driven rod 5 is driven to make the mobile feed pipe 6 disengage from the fixed feed pipe 2, so that the entire feeding device can be lifted, which is convenient for the later maintenance of the centrifuge drum 12.

[0069] The present invention has the following significant effects: the crank-connecting rod telescopic disengagement feeding device described in the present invention rotates the active rod 4 through the lifting rod to push the driven rod 5, controls the mobile feed pipe 6 to freely telescope and disengage, realizes automatic engagement and disengagement of the feed pipe, facilitates manual disassembly, and facilitates the replacement of the positive cup centrifuge drum 12 below the feeding device.

[0070] See also Figure 1 and Figure 2 The specific working process of the feeding device of the sedimentation centrifuge in this embodiment is as follows:

[0071] The lifting rod (i.e., the driving rod 1) passes through the fixed shielding member 9 and can move up and down. The lower part is connected to the slide groove of the active rod 4. One end of the active rod 4 is connected to the bracket 3, and the other end is connected to the driven rod 5. The movable feed pipe 6 is connected to the driven rod 5, and one end is inserted into the fixed feed pipe fixed on the outer sleeve 7. The outer sleeve 7 is fixed to the lower part of the fixed shielding member 9 by bolts.

[0072] When the centrifuge is working to feed, the active rod 4 is driven to rotate by moving the lifting rod, pushing the driven rod 5 and the mobile feed pipe 6 to slide along the fixed feed pipe 1 and insert into the fixed feed pipe, and the feeding device is in an engaged state; when the centrifuge drum 12 needs to be hoisted for maintenance, the mobile feed pipe 6 needs to be disengaged, and the active rod 4 can be driven to rotate in the opposite direction by the lifting rod, pulling the driven rod 5 and the mobile feed pipe 6 to slide along the fixed feed pipe 1, inserting the mobile feed pipe 6 into the fixed feed pipe 2 to disengage, and making way for the channel above the drum 12, so as to facilitate the maintenance of the centrifuge drum 12 in the later stage.

[0073] In summary, the feeding device in this embodiment can automatically control the extension and retraction of the mobile feed tube 6 to achieve automatic engagement and disengagement of the feed tube. It has a simple and easy-to-reach structure, strong operability, and is convenient for manual disassembly, thereby facilitating the maintenance of the drum 12 of the positive cup centrifuge.

[0074] The feeding device of this sedimentation centrifuge has the following advantages:

[0075] 1. It is convenient to realize the quick separation between the fixed feed pipe and the mobile feed pipe, and the mobile feed pipe can be retracted into the first cavity 10, that is, to make way for the maintenance or replacement of the drum 12, so that the staff can lift the drum 12 out of the closed chamber from above, so as to facilitate the maintenance or replacement of the drum 12.

[0076] 2. By optimizing the slope design between the mobile feed pipe 6 and the fixed feed pipe, the problem of the centrifuge shaft being too long can be avoided while ensuring the flow of materials.

[0077] 3. By optimizing the structure of the second pipe section 8 of the fixed feed pipe, the second pipe section 8 can guide the radioactive slag-containing liquid to the side wall of the drum 12, which is conducive to the rapid sedimentation and separation of the radioactive slag-containing liquid by the drum 12.

[0078] 4. By sleeve-mounting the mobile feed pipe 6 on the first pipe section 2, the first pipe section 2 guides the mobile feed pipe 6, and the docking port 81 is flared, so that the mobile feed pipe 6 can be more easily engaged with the docking port 81.

[0079] Example 2

[0080] See also Figure 1 and Figure 2The present invention discloses a decanter centrifuge system, comprising: a rotating drum 12 and the above-mentioned feeding device of the decanter centrifuge.

[0081] The second pipe section 8 of the fixed feed pipe of the feed device of the sedimentation centrifuge extends downward into the drum 12 , and the feed device of the sedimentation centrifuge is used to transport the radioactive slag-containing liquid to be separated by sedimentation into the drum 12 .

[0082] The system further includes an outer sleeve 7 and a shielding member 9. A first cavity 10 and a second cavity 11 are arranged in the outer sleeve 7. The first cavity 10 is located outside the second cavity 11. The first cavity 10 is connected to the upper end of the second cavity 11. The first pipe section 2 of the feeding device of the sedimentation centrifuge is located in the first cavity 10, the second pipe section 8 is located in the second cavity 11, and the drum is located in the second cavity 11 and below the second pipe section 8. The shielding member 9 is installed at the upper end of the outer sleeve 7 to seal the first cavity 10 and the second cavity 11 to prevent leakage of radioactive aerosols in the first cavity 10 and the second cavity 11.

[0083] like Figure 3 As shown, the shielding member 9 is provided with an installation opening, in which a shielding plug 13 is installed, a rotating shaft 14 of the sedimentation centrifuge passes through the shielding plug 13, and the lower end of the rotating shaft 14 is connected to the drum 12. When the drum 12 needs to be disassembled, it is only necessary to lift the shielding plug 13, the rotating shaft 14, the drum 12 and the second pipe section 8 out of the shielding cavity together to complete the quick disassembly of the drum 12.

[0084] Specifically, the decanter centrifuge system in this embodiment adopts the feeding device of the decanter centrifuge in Example 1, which can facilitate manual disassembly of the feeding device, thereby facilitating the maintenance of the drum 12 of the cup centrifuge.

[0085] 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 feeding device for a decanter centrifuge, used for feeding a drum (12) of a decanter centrifuge, characterized in that: include: Fixed feed pipe, mobile feed pipe (6); The fixed feed pipe comprises a first pipe section (2) and a second pipe section (8), wherein the first pipe section (2) and the second pipe section (8) are arranged at an interval. The first pipe section (2) is located outside the rotating drum (12); one end of the second pipe section (8) is provided with a docking port (81), the docking port (81) is located above the rotating drum (12); the other end of the second pipe section (8) extends downward into the interior of the rotating drum, and the docking port (81) faces the pipe opening of the first pipe section (2); The movable feed pipe (6) is located between the first pipe section (2) and the second pipe section (8); the central axis of the movable feed pipe (6) is on the same extension line as the central axis of the first pipe section (2); one end of the movable feed pipe (6) is sleeved on the first pipe section (2), and the other end is directly opposite to the docking port (81); the movable feed pipe (6) can move along the axial direction of the first pipe section (2), thereby enabling the second end of the movable feed pipe (6) to engage with / disengage from the docking port (81); When the movable feed pipe (6) is engaged with the docking port (81), the first pipe section (2) conveys materials into the drum through the movable feed pipe (6) and the second pipe section (8); when the movable feed pipe (6) is disengaged from the docking port (81), a maintenance passage for lifting the drum upward can be opened.

2. The feeding device of the decanter centrifuge according to claim 1, characterized in that: The second pipe section (8) comprises a bending section (82) and a guiding section (83); the bending section (82) is located above the guiding section (83); one end of the bending section (82) is connected to the docking port (81), and the other end is connected to the guiding section (83); the bending section (82) is connected to the upper end of the rotating drum; the guiding section (83) extends in a vertical direction; a discharge port is provided at the lower end of the guiding section (83), and the discharge port faces the inner wall of the rotating drum.

3. The feeding device of the decanter centrifuge according to claim 2, characterized in that: The first pipe section (2) is located at a higher position than the second pipe section (8), and the first pipe section (2) and the movable feed pipe (6) are both arranged at an inclination, and the position of the end of the movable feed pipe (6) facing away from the docking port (18) is higher than the position of the end facing the docking port (18).

4. The feeding device of the decanter centrifuge according to claim 1, characterized in that: It also includes a driving unit, which is connected to the movable feeding pipe (6) and is used to drive the movable feeding pipe (6) to move along the central axis direction of the first pipe section (2), thereby enabling the movable feeding pipe (6) to engage with / disengage from the docking port (81).

5. The feeding device of the decanter centrifuge according to claim 4, characterized in that: The driving unit includes a driving source and a connecting rod assembly, The connecting rod assembly comprises an active rod (4), a driven rod (5) and a bracket (3), the two ends of the active rod (4) are respectively a first end and a second end, the first end of the active rod (4) is hinged to the bracket (3), the second end of the active rod (4) is hinged to one end of the driven rod (5), and the other end of the driven rod (5) is hinged to the movable feed pipe (6); The driving source is connected to the middle part of the active rod (4) and is used to drive the active rod (4) to rotate around the hinge axis at its first end, thereby driving the movable feed pipe (6) to move along the central axis direction of the first pipe section (2).

6. The feeding device of the decanter centrifuge according to claim 5, characterized in that: The first end of the active rod (4) is hinged to the lower end of the bracket (3), and the position of the first end of the active rod (4) is lower than the position of the first pipe section (2).

7. The feeding device of the decanter centrifuge according to claim 6, characterized in that: A waist-shaped hole (41) is provided in the middle of the active rod (4), the waist-shaped hole (41) extends along the length direction of the active rod (4), a slider is inserted into the waist-shaped hole (41), the slider can slide along the extension direction of the waist-shaped hole (41), and the driving source is connected to the slider.

8. The feeding device of the decanter centrifuge according to claim 7, characterized in that: The driving unit further comprises a driving rod (1), wherein the driving rod (1) extends in a vertical direction. The driving source is located above the connecting rod assembly, the upper end of the driving rod (1) is connected to the driving source, and the lower end is hinged to the slider, and the driving source is used to drive the driving rod (1) to move in the vertical direction, thereby driving the active rod (4) to rotate around the hinge axis at its first end.

9. The feeding device of the decanter centrifuge according to claim 1, characterized in that: The docking port (81) is in a flared shape.

10. A decanter centrifuge system, characterized in that: include: A rotary drum and a feeding device of a decanter centrifuge according to any one of claims 1 to 9; The second pipe section (8) of the fixed feed pipe of the feed device of the sedimentation centrifuge extends downward into the drum, and the feed device of the sedimentation centrifuge is used to transport the radioactive slag-containing liquid to be separated by sedimentation into the drum.

11. The decanter centrifuge system according to claim 10, characterized in that: It also comprises an outer sleeve (7) and a shielding member (9), wherein a first cavity (10) and a second cavity (11) are arranged in the outer sleeve (7), the first cavity (10) is located outside the second cavity (11), and the first cavity (10) is communicated with the upper end of the second cavity (11); The first pipe section (2) of the feeding device of the decanter centrifuge is located in the first cavity (10), the second pipe section (8) is located in the second cavity (11), and the drum is located in the second cavity (11) and below the second pipe section (8); The shielding member (9) is mounted on the upper end of the outer sleeve (7) and is used to seal the first cavity (10) and the second cavity (11) to prevent leakage of radioactive aerosols in the first cavity (10) and the second cavity (11).

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