Maintenance device for control rod drive mechanism of high-temperature gas-cooled reactor

Abstract

A maintenance device for a control rod drive mechanism of a high-temperature gas-cooled reactor, comprising a maintenance cylinder (100), which comprises a cylinder body (101), a plurality of sets of slots (101a), a sealing cover plate (102), a plurality of support legs (103), and an extraction tube (104); a plurality of clamping units (200), which comprise a plurality of fixing rings (201), elevated plates (202), extension rods (203), upper clamps (204) and lower clamps (205); and a switching unit (300), which comprises a bearing platform (301), a plurality of bosses (302), slot holes (303), tightening members (304), driving members (305) and a through hole (306). The device enables static maintenance of spare parts for a control rod drive mechanism; in addition, by means of dual clamping, the control rod drive mechanism (400) can be more stably fixed in a storage position, reducing potential shaking or displacement during storage, thereby ensuring the safety and integrity of the mechanism. Moreover, the cooperative use of lower clamping plates (205a) and upper clamping plates (204b) enables clamping of the control rod drive mechanism (400) to flexibly adapt to the requirements for different diameters.

Description

A high temperature gas cooled reactor control rod drive mechanism maintenance device TECHNICAL FIELD

[0001] The present application relates to the technical field of boiler flue gas wastewater treatment, in particular to a high temperature gas cooled reactor control rod drive mechanism maintenance device. BACKGROUND

[0002] The control rod system is a high temperature gas cooled reactor reactivity control and shutdown system. The control rod system is composed of 24 sets of drive mechanisms and control rods. When the reactor is in normal operation, the control rod system drive mechanism drives the control rod to move in the core, realizing the reactivity and power control of the reactor.

[0003] The high temperature gas cooled reactor control rod drive mechanism maintenance method is overall replacement and offline maintenance. Therefore, the high temperature gas cooled reactor drive mechanism spare parts are purchased as a whole. Due to the high price, the number of spare parts is very small. Due to the extremely low failure rate of the drive mechanism, the drive mechanism spare parts are stored for a long time. The bottom of the drive mechanism is in an open form, and the overall shape is a long tube. When stored, it is easy to cause rolling, causing radioactive material leakage, and the internal components are mainly made of carbon steel. The air is humid along the coast, which can easily cause corrosion to the internal components of the drive mechanism. The internal components of the drive mechanism are transmitted in a rotating manner. Once rusted, it will cause the drive mechanism to jam, making the drive mechanism spare parts unusable. The internal stepping motor of the drive mechanism is an electrical equipment. Once the drive mechanism is damp, it may cause insulation failure, thereby causing the drive mechanism spare parts to be unusable. Therefore, there is a lack of a maintenance device for control rod drive mechanism spare parts. SUMMARY

[0004] In view of the above or the problems existing in the prior art, the present application is proposed.

[0005] Therefore, the purpose of the present application is to provide a high temperature gas cooled reactor control rod drive mechanism maintenance device, which can solve the problem of lack of maintenance device for control rod drive mechanism spare parts; and the problem that the control rod drive mechanism spare parts are not stored and are easy to roll.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a high temperature gas cooled reactor control rod drive mechanism maintenance device, comprising a maintenance cylinder, a cylinder body, a plurality of clamping slots arranged on the inner wall of the cylinder body, a sealing cover plate arranged on one side of the cylinder body, a plurality of support legs arranged in a circumferential array at the bottom of the cylinder body, and an air extraction pipe arranged at the bottom of the cylinder body;

[0007] A plurality of clamping units, comprising a plurality of fixing rings arranged in a circumferential array at the bottom of the cylinder body, a heightening plate arranged on one side of each of the fixing rings, an extension rod arranged on the inner side of the heightening plate, an upper clamping jaw arranged on one side of the extension rod, and a lower clamping jaw arranged in the inner part of the fixing ring;

[0008] The switching unit comprises a bearing table arranged at the bottom of the fixed ring, a plurality of groups of bosses arranged in a circumferential array at the bottom of the bearing table, a slot hole arranged on each group of the bosses, a tightening member arranged inside the slot hole, a driving member arranged at the bottom of the tightening member, and a through hole arranged through the center of the bearing table;

[0009] The control rod drive mechanism.

[0010] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the heightening plate comprises an outer heightening plate, an inner heightening plate arranged at one side of the outer heightening plate, and a limiting block arranged outside the outer heightening plate.

[0011] The outer heightening plate comprises a support table arranged at the end thereof.

[0012] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the boss comprises a slot arranged at one side thereof, and an arc-shaped groove arranged at one side of the slot.

[0013] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the driving member comprises a belt wheel arranged at the bottom of the barrel, a transmission shaft arranged at one side of the belt wheel, a driving rod arranged at one side of the transmission shaft, and a transmission ring arranged at one side of the driving rod.

[0014] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the driving rod comprises a driving knob arranged at one side thereof, and an arc-shaped protrusion arranged at one side of the driving knob.

[0015] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the fixed ring comprises a containing groove arranged at the inner wall thereof.

[0016] The lower clamping jaw comprises two groups of lower clamping plates arranged at both sides of the containing groove, an L-shaped connecting rod arranged at the bottom of each group of the lower clamping plates, a lower pressing block arranged at one side of the L-shaped connecting rod, and a spring arranged in the middle of the lower pressing block.

[0017] As a preferred scheme of the maintenance device for the control rod drive mechanism of the high-temperature gas-cooled reactor, the extension rod comprises a straight rod arranged outside the outer heightening plate and the inner heightening plate, a top head arranged at one side of the straight rod, and a trigger rod arranged at one side of the straight rod.

[0018] As a preferred scheme of the high temperature gas cooled reactor control rod drive mechanism maintenance device, the upper clamping jaw comprises a V-shaped connecting rod arranged on one side of the top head, and an upper clamping plate arranged on one side of the V-shaped connecting rod.

[0019] As a preferred scheme of the high temperature gas cooled reactor control rod drive mechanism maintenance device, the lower pressing block comprises a lower pressing platform, a pin column arranged at the bottom of the lower pressing platform, a stopper arranged on one side of the pin column, and a knob arranged at the bottom of the pin column.

[0020] As a preferred scheme of the high temperature gas cooled reactor control rod drive mechanism maintenance device, the control ring comprises a spiral protrusion on the inner side of the control ring, and a baffle arranged at the bottom of the control ring.

[0021] The trigger rod comprises a hook angle arranged on the spiral protrusion.

[0022] The beneficial effects of the present application are as follows: the design of the maintenance cylinder, the multiple clamping units and the switching unit can provide static maintenance for the spare parts of the control rod drive mechanism, and through twice clamping, the control rod drive mechanism can be more stably fixed at the storage position, reducing the possible shaking or displacement during storage, thereby ensuring the safety and integrity of the mechanism. At the same time, the cooperation of the lower clamping plate and the upper clamping plate can flexibly cope with the requirements of different diameters when clamping the control rod drive mechanism, showing excellent adaptability and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Fig. 1 is a three-dimensional view of the high temperature gas cooled reactor control rod drive mechanism maintenance device of the present application.

[0025] Fig. 2 is a schematic view of the clamping unit structure of the present application.

[0026] Fig. 3 is a partial schematic view of the high temperature gas cooled reactor control rod drive mechanism maintenance device of the present application.

[0027] Fig. 4 is a partial cross-sectional view of the lower clamping jaw of the present application.

[0028] Fig. 5 is a partial cross-sectional view of the upper clamping jaw of the present application.

[0029] Fig. 6 is a partial schematic view of the bottom position of the present application. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more obvious and comprehensible, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0031] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application, however, can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application. It can be appreciated by those skilled in the art that the present application can be practiced without such specific details.

[0032] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive with other embodiments.

[0033] Embodiment 1

[0034] Referring to FIGS. 1-4, a first embodiment of the present application provides a maintenance device for a control rod drive mechanism of a high temperature gas cooled reactor, which includes a maintenance cylinder 100, including a cylinder body 101, a plurality of clamping grooves 101a arranged on the inner wall of the cylinder body 101, a sealing cover plate 102 arranged on one side of the cylinder body 101, a plurality of support legs 103 arranged in a circumferential array at the bottom of the cylinder body 101, and an air extraction pipe 104 arranged at the bottom of the cylinder body 101;

[0035] A plurality of clamping units 200, including a plurality of fixed rings 201 arranged in a circumferential array at the bottom of the cylinder body 101, a heightening plate 202 arranged on one side of each fixed ring 201, an extension rod 203 arranged on the inner side of the heightening plate 202, an upper clamping jaw 204 arranged on one side of the extension rod 203, and a lower clamping jaw 205 arranged inside the fixed ring 201;

[0036] A switching unit 300, including a bearing table 301 arranged at the bottom of the fixed ring 201, a plurality of bosses 302 arranged in a circumferential array at the bottom of the bearing table 301, a slot hole 303 arranged on each boss 302, a tightening member 304 arranged inside the slot hole 303, a driving member 305 arranged at the bottom of the tightening member 304, and a through hole 306 arranged through the center of the bearing table 301;

[0037] A control rod drive mechanism 400.

[0038] Further, the heightening plate 202 includes an outer heightening plate 202a, an inner heightening plate 202b arranged on one side of the outer heightening plate 202a, and a limiting block 202c arranged on the outer side of the outer heightening plate 202a;

[0039] The outer side frame high plate 202a comprises a support table 202a-1 arranged at the end thereof.

[0040] Further, the boss 302 comprises a slot 302a arranged at one side thereof, and an arc-shaped groove 302b arranged at one side of the slot 302a.

[0041] Further, the driving member 305 comprises a belt wheel 305a arranged at the bottom of the barrel body 101, a transmission shaft 305b arranged at one side of the belt wheel 305a, a driving rod 305c arranged at one side of the transmission shaft 305b, and a transmission ring 305d arranged at one side of the driving rod 305c.

[0042] Further, the driving rod 305c comprises a driving block 305c-1 arranged at one side thereof, and an arc-shaped protrusion 305c-2 arranged at one side of the driving block 305c-1.

[0043] Further, the fixed ring 201 comprises a containing groove 201a arranged at the inner wall thereof.

[0044] The lower clamping jaw 205 comprises two groups of lower clamping plates 205a arranged at both sides of the containing groove 201a, L-shaped connecting rods 205b arranged at the bottom of each group of lower clamping plates 205a, pressing blocks 205c arranged at one side of the L-shaped connecting rods 205b, and springs 205d arranged in the middle of the pressing blocks 205c.

[0045] Further, the extension rod 203 comprises a straight rod 203a arranged at the outer side of the outer side frame high plate 202a and the inner side frame high plate 202b, a top head 203b arranged at one side of the straight rod 203a, and a trigger rod 203c arranged at one side of the straight rod 203a.

[0046] Further, the upper clamping jaw 204 comprises a V-shaped connecting rod 204a arranged at one side of the top head 203b, and an upper clamping plate 204b arranged at one side of the V-shaped connecting rod 204a.

[0047] Further, the pressing block 205c comprises a pressing table 205c-1, a pin column 205c-2 arranged at the bottom of the pressing table 205c-1, a stop block 205c-3 arranged at one side of the pin column 205c-2, and a bent head 205c-4 arranged at the bottom of the pin column 205c-2.

[0048] Further, the transmission ring 305d comprises a control ring 305d-1 arranged inside the slot hole 303, a spiral protrusion 305d-2 arranged at the inner side of the control ring 305d-1, and a baffle 305d-3 arranged at the bottom of the control ring 305d-1.

[0049] The trigger rod 203c comprises a hook angle 203c-1 arranged on the spiral protrusion 305d-2.

[0050] It should be noted that the maintenance cylinder 100 provides a storage environment for the control rod drive mechanism 400 to avoid corrosion. The inside of the cylinder body 101 is sealed, and the bottom of the cylinder body 101 is provided with an exhaust pipe 104. The control rod drive mechanism 400 is placed in the maintenance cylinder 100 and is pumped to a vacuum state by a vacuum pump, and nitrogen is filled therein to avoid contact between the control rod drive mechanism 400 and air. Four sets of support legs 103 are welded to the lower surface of the cylinder body 101, which supports the cylinder body 101 to avoid corrosion. A sealing cover plate 102 is provided on the upper end surface of the cylinder body 101, which is slidably connected to the upper end surface of the cylinder body 101 to facilitate storage of the control rod drive mechanism 400.

[0051] Preferably, the clamping unit 200 provides a limiting support for the control rod drive mechanism 400. A switching unit 300 is provided at the bottom of the clamping unit 200, which can control the clamping and rotation switching of the clamping unit 200 on the control rod drive mechanism 400. Six sets of clamping units 200 are provided on the switching unit 300 to clamp the control rod drive mechanism 400.

[0052] Preferably, the number of clamping units 200 can be set according to the storage needs of spare parts of the control rod drive mechanism 400, and the number of bosses 302 at the bottom of the bearing table 301 should be consistent with the number of clamping units 200.

[0053] Preferably, the clamping unit 200 is arranged in a circumferential array on the upper end surface of the switching unit 300 and is distributed along the side edge. In this way, the ring chain structure in the high temperature gas cooled reactor system can be placed in the middle part for storage, and the space is used reasonably. Each set of fixed rings 201 is arranged in a circumferential array on the bearing table 301 and is fixedly connected together. A lower clamping jaw 205 is arranged inside the fixed ring 201 and can clamp the tail end of the control rod drive mechanism 400. A set of elevated plates 202 is fixedly connected above the fixed ring 201, and the elevated plates 202 are divided into two groups, one of which is an outer elevated plate 202a and the other of which is an inner elevated plate 202b. The difference is that a plurality of limiting blocks 202c are fixedly arranged on the side edge of the outer elevated plate 202a at equal intervals, and the limiting blocks 202c are engaged with the clamping grooves 101a on the inner wall of the cylinder body 101 to provide limiting support for the entire clamping unit 200. The same is that a plurality of grooves are provided on the side edges of the outer elevated plate 202a and the inner elevated plate 202b, and a set of extension rods 203 is slidably connected in the grooves. The upper end of the extension rod 203 is in contact with the tail of an upper clamping jaw 204, and the lower end of the extension rod 203 extends into the fixed ring 201. The upper clamping jaw 204 is controlled by the extension rod 203 and can clamp the end of the control rod drive mechanism 400. Under the action of the upper clamping jaw 204 and the lower clamping jaw 205, the control rod drive mechanism 400 can be firmly fixed.

[0054] Preferably, the bottom of the barrel 101 is sealed, and the switching unit 300 is located inside the bottom of the barrel 101, ensuring that the maintenance barrel 100 maintains a sealed environment. The carrier platform 301 is attached to the bottom of the barrel 101, and the bottom of the carrier platform 301 is fixedly provided with a boss 302. The number of bosses 302 is consistent with the number of fixed rings 201. A slot hole 303 is provided through the center of the boss 302, and the axis of the slot hole 303 is vertically aligned with the axis of the fixed ring 201. A set of tightening members 304 is clamped inside each set of slot holes 303, and the tightening members 304 are in the shape of a ring with a hollow inside. The lower end of the extension rod 203 is clamped inside the tightening member 304, and a drive member 305 is provided at the lower end of the tightening member 304. The drive member 305 can be rotated to push the carrier platform 301 to rotate at intervals.

[0055] Preferably, an opening is formed between every two adjacent bosses 302, which is a slot 302a. An arc-shaped groove 302b is fixedly provided at the bottom of the boss 302. The boss 302 and the carrier platform 301 are of an integrated structure. The drive member 305 is fixedly provided at the slot hole 303 corresponding to the sealing cover plate 102. A belt wheel 305a is provided outside the bottom of the barrel 101, which can be driven by a belt. A transmission shaft 305b is fixedly connected to the upper end of the belt wheel 305a and is hingedly connected to the bottom of the barrel 101. A drive rod 305c is fixedly connected to the upper end of the transmission shaft 305b. The drive rod 305c has a special structure, with a Z-shaped handle at one end and an arc-shaped protrusion at the other end. Specifically, the drive rod 305c has a drive knob 305c-1 at one end and an arc-shaped protrusion 305c-2 at the other end.

[0056] In use, when the control rod drive mechanism 400 spare parts need to be maintained statically, the control rod drive mechanism 400 is installed and placed in the maintenance barrel 100 section by section. Specifically, the sealing cover plate 102 at the end of the barrel 101 is opened, a gap is opened above the maintenance barrel 100, and the control rod drive mechanism 400 is hoisted into the gap by an external device, so that the tail of the control rod drive mechanism 400 extends between the fixed rings 201, and the lower clamping jaw 205 preliminarily fixes it. Then, an external motor is started to drive the belt wheel 305a to rotate, which makes the drive rod 305c rotate along the transmission shaft 305b.

[0057] In the process of driving rod 305c self-rotation, two cases will appear: one, when the driving block 305c-1 in the rotation process will gradually come into the slot 302a, because the bearing table 301 is slidingly connected in the bottom of the inner side of the barrel 101, when the driving block 305c-1 enters the slot 302a inside, it will push the bearing table 301 to rotate, complete the switching clamping unit 200, can be clamped control rod drive mechanism 400 has been rotated to the inside of the barrel 101;

[0058] Two, because the arc-shaped block 305c-2 and the arc-shaped groove 302b tangent, when the driving block 305c-1 leaves the slot 302a, the side of the arc-shaped block 305c-2 will be embedded in the arc-shaped groove 302b, so that the arc-shaped block 305c-2 and the arc-shaped groove 302b are inscribed, thereby limiting the rotation of the bearing table 301, having a self-locking function. This process can be installed into the clamping unit 200 of the control rod drive mechanism 400.

[0059] After the control rod drive mechanism 400 is placed, the sealing cover plate 102 is closed; the maintenance barrel 100 is pumped to a vacuum state through the exhaust pipe 104, and nitrogen is filled into it, so as to avoid the contact of the control rod drive mechanism 400 with air, and complete the static maintenance.

[0060] In summary, the design of the maintenance barrel 100 and the multiple sets of clamping units 200 and switching units 300 not only realizes the static maintenance of the control rod drive mechanism 400 spare parts, but also ensures the long-term performance stability and reliability of the spare parts. Under the clamping unit 200, the control rod drive mechanism 400 can be quickly and stably clamped in the maintenance barrel 100. Thus unnecessary bumps in the process of storing the control rod drive mechanism 400 into the maintenance barrel 100 are reduced. Further, the service life of the control rod drive mechanism 400 is prolonged. The installation time is greatly shortened, and the work efficiency is improved.

[0061] Embodiment 2

[0062] Referring to FIGS. 1-6, the second embodiment of the present application is different from the first embodiment in that the heightening plate 202 includes an outer heightening plate 202a, an inner heightening plate 202b arranged on one side of the outer heightening plate 202a, and a limiting block 202c arranged on the outer side of the outer heightening plate 202a.

[0063] The outer heightening plate 202a includes a support table 202a-1 arranged on the end thereof.

[0064] Further, the boss 302 includes a slot 302a arranged on one side thereof, and an arc-shaped groove 302b arranged on one side of the slot 302a.

[0065] Further, the fixed ring 201 comprises a receiving groove 201a arranged on the inner wall thereof;

[0066] The lower clamping jaw 205 comprises two groups of lower clamping plates 205a arranged on both sides of the receiving groove 201a, an L-shaped connecting rod 205b arranged at the bottom of each group of lower clamping plates 205a, a pressing block 205c arranged on one side of the L-shaped connecting rod 205b, and a spring 205d arranged in the middle of the pressing block 205c.

[0067] Further, the extension rod 203 comprises a straight rod 203a arranged on the outer side of the outer side frame height plate 202a and the inner side frame height plate 202b, a top head 203b arranged on one side of the straight rod 203a, and a trigger rod 203c arranged on one side of the straight rod 203a.

[0068] Further, the upper clamping jaw 204 comprises a V-shaped connecting rod 204a arranged on one side of the top head 203b, and an upper clamping plate 204b arranged on one side of the V-shaped connecting rod 204a.

[0069] Further, the pressing block 205c comprises a pressing platform 205c-1, a pin column 205c-2 arranged at the bottom of the pressing platform 205c-1, a stop block 205c-3 arranged on one side of the pin column 205c-2, and a bent head 205c-4 arranged at the bottom of the pin column 205c-2.

[0070] Further, the transmission ring 305d comprises a control ring 305d-1 arranged inside the slot hole 303, a spiral protrusion 305d-2 arranged on the inner side of the control ring 305d-1, and a baffle 305d-3 arranged at the bottom of the control ring 305d-1.

[0071] The trigger rod 203c comprises a hook angle 203c-1 arranged on the spiral protrusion 305d-2.

[0072] It should be noted that the fixed ring 201 is hollow inside, and a through hole is left at the bottom thereof, so as to facilitate the clamping control of the upper clamping jaw 204 and the lower clamping jaw 205 on the control rod drive mechanism 400. The two groups of lower clamping jaws 205 are symmetrically installed inside the fixed ring 201, wherein the receiving grooves 201a are formed on the sidewall of the fixed ring 201 at positions corresponding to the two groups of lower clamping plates 205a, and the lower clamping plates 205a can be accommodated therein. The L-shaped connecting rods 205b are hinged at the bottom of each group of lower clamping plates 205a, and the corners of the L-shaped connecting rods 205b are hinged in the receiving grooves 201a of the fixed ring 201, so that the L-shaped connecting rods 205b can rotate at the inflection points. One end of the L-shaped connecting rod 205b is hinged at the bottom of the lower clamping plate 205a, and the other end is clamped on the pressing block 205c. When the pressing block 205c moves downward, it will drive the L-shaped connecting rod 205b to rotate, so that the lower clamping plate 205a moves towards the middle of the fixed ring 201, the hole diameter is reduced, and the control rod drive mechanism 400 is clamped.

[0073] Preferably, the lower clamp plate 205a can be an arc-shaped circular plate, and the diameter of the fixed ring 201 is larger than that of the control rod drive mechanism 400, so as to ensure that the control rod drive mechanism 400 can extend into the interior of the fixed ring 201. The arc-shaped circular plate of the lower clamp plate 205a can clamp the control rod drive mechanism 400 at different diameters.

[0074] Preferably, the lower pressing block 205c has a special structure, the upper end surface thereof is a circular plate with a larger diameter, and is a lower pressing surface 205c-1. A pin 205c-2 is fixedly connected below the lower pressing surface 205c-1. A plurality of stoppers 205c-3 are fixedly connected to the side of the pin 205c-2. The stoppers 205c-3 are clamped with the L-shaped connecting rod 205b between the stoppers 205c-3 and the lower pressing surface 205c-1, so as to limit the movement of the L-shaped connecting rod 205b and control the opening and closing movement of the lower clamp plate 205a. A group of springs 205d are sleeved on the pin 205c-2 below the stoppers 205c-3. One end of the spring 205d is abutted against the bottom of the stopper 205c-3, and the other end is abutted against the bottom of the fixed ring 201. A hook 205c-4 extends horizontally from the bottom of the pin 205c-2. The lower surface of the hook 205c-4 is chamfered. The lower pressing block 205c is an integral structure.

[0075] When the bottom of the control rod drive mechanism 400 contacts the lower pressing surface 205c-1, the lower pressing surface 205c-1 moves downward under the action of gravity, so as to drive the L-shaped connecting rod 205b to rotate downward and drive the lower clamp plate 205a inward to clamp the control rod drive mechanism 400. Finally, the control rod drive mechanism 400 is preliminarily clamped and fixed, which is convenient for adjusting the position of the control rod drive mechanism 400, ensures accurate positioning, and effectively avoids damage to internal precision components caused by over-tightening of the clamping.

[0076] Preferably, the upper end surface of the fixed ring 201 is fixedly connected with the elevated plate 202, and the elevated plate 202 is an integral structure with the fixed ring 201. The outer elevated plate 202a and the inner elevated plate 202b are provided with a slot on the side wall, and a set of extension rods 203 are clamped in the slot. The end of the outer elevated plate 202a and the end of the inner elevated plate 202b are fixedly connected with a set of support tables 202a-1, and the inside of the support table 202a-1 is provided with a slot, and a set of upper clamping plates 204b are hinged in the slot. The bottom of each set of upper clamping plates 204b is fixedly connected with a set of V-shaped connecting rods 204a. The end of the extension rod 203 is a top head 203b, the middle is a straight rod 203a, the straight rod 203a is limited in the slot on the side wall of the outer elevated plate 202a and the inner elevated plate 202b, the bottom of the extension rod 203 is a trigger rod 203c, the trigger rod 203c has a certain shape, and the trigger rod 203c extends into the bottom of the fixed ring 201 at the opening of the fixed ring 201. The top head 203b is on the bottom of the V-shaped connecting rod 204a. When the extension rod 203 moves upward, the top head 203b at the end of the extension rod 203 will lift one end of the V-shaped connecting rod 204a upward, so that the V-shaped connecting rod 204a rotates upward, and finally the upper clamping plates 204b on both sides are folded to the middle.

[0077] Preferably, the upper clamping plate 204b is also an arc-shaped circular plate, but the diameter is smaller than that of the lower clamping plate 205a. When the lower clamping plate 205a preliminarily clamps the control rod drive mechanism 400 under the action of gravity, the upper clamping plate 204b above can also have a limiting effect on the control rod drive mechanism 400, and in addition, under the action of the lower clamping plate 205a and the upper clamping plate 204b, different diameters of the clamped control rod drive mechanism 400 can be coped with.

[0078] Preferably, the bottom of the fixed ring 201 is hollow, and the center of the slot hole 303 on the boss 302 is consistent with the center of the slot hole 303. The trigger rod 203c and the elbow 205c-4 are all extended into the slot hole 303. A set of transmission rings 305d are clamped on the slot hole 303, the control ring 305d-1 is fitted with the slot hole 303, and the helical protrusion 305d-2 is fixedly arranged on the control ring 305d-1. The bottom of the helical protrusion 305d-2 is a flat surface, and the upper end is an inclined surface. When the elbow 205c-4 moves downward, it can easily pass the helical protrusion 305d-2, but when it moves upward, it is limited by the bottom of the helical protrusion 305d-2. The hook 203c-1 at the bottom of the trigger rod 203c is clamped on the bottom of the helical protrusion 305d-2. The baffle 305d-3 is fixedly connected to the bottom of the control ring 305d-1, and the baffle 305d-3 can be in contact with the arc-shaped protrusion 305c-2 on the drive rod 305c. Under the action of the arc-shaped protrusion 305c-2, the baffle 305d-3 drives the control ring 305d-1 to rotate, so that the helical protrusion 305d-2 rotates, and the hook 203c-1 and the elbow 205c-4 are driven downward. The other structures are the same as those of the first embodiment.

[0079] Preferably, the hook angle 203c-1 and the elbow 205c-4 have an angle consistent with the thread angle of the spiral protrusion 305d-2, which facilitates better engagement with the spiral protrusion 305d-2.

[0080] When the bottom of the control rod drive mechanism 400 contacts the lower pressing platform 205c-1, the lower pressing platform 205c-1 moves downward under the action of gravity, thereby causing the L-shaped connecting rod 205b to rotate downward and driving the lower clamping plate 205a inward to preliminarily clamp the control rod drive mechanism 400. The elbow 205c-4 also moves downward, and finally the upper end surface at the end of the elbow 205c-4 is clamped at the bottom of the spiral protrusion 305d-2, thereby offsetting the influence of the buffering force of the spring 205d on the clamping effect.

[0081] In use, after the lower clamping plate 205a preliminarily clamps the control rod drive mechanism 400, when clamping the next control rod drive mechanism 400, the driving rod 305c rotates, and the arc-shaped protrusion 305c-2 will first be tangent to the arc-shaped groove 302b, the arc-shaped protrusion 305c-2 rotates to push the baffle 305d-3 on one side to rotate, and under the action of the spiral protrusion 305d-2, the hook angle 203c-1 and the elbow 205c-4 move downward to fold the upper clamping plate 204b and the lower clamping plate 205a, thereby completing the final clamping and installation of the control rod drive mechanism 400. If it is removed, the pulley 305a is reversed to release the clamping of the control rod drive mechanism 400.

[0082] In summary, the design of the maintenance cylinder 100 and the multiple clamping units 200 and switching units 300 can statically maintain the spare parts of the control rod drive mechanism 400, and through two clamping operations, the control rod drive mechanism 400 can be more stably fixed at the storage position, reducing the possibility of shaking or displacement during storage, thereby ensuring the safety and integrity of the mechanism. At the same time, the cooperation of the lower clamping plate 205a and the upper clamping plate 204b enables flexible response to different diameter requirements when clamping the control rod drive mechanism 400, demonstrating excellent adaptability and practicality.

[0083] Importantly, the above embodiments are only used to illustrate the technical solutions of the present application and not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A high temperature gas cooled reactor control rod drive mechanism servicing device, characterized by: The utility model relates to a high temperature gas cooled reactor control rod drive mechanism maintenance device, including, a maintenance cylinder (100) comprising a cylinder body (101), a plurality of sets of clamping grooves (101a) arranged on the inner wall of the cylinder body (101), a sealing cover plate (102) arranged on one side of the cylinder body (101), a plurality of sets of supporting legs (103) arranged in a circumferential array on the bottom of the cylinder body (101), and an air extraction pipe (104) arranged on the bottom of the cylinder body (101); a plurality of sets of clamping units (200) comprising a plurality of sets of fixing rings (201) arranged in a circumferential array on the bottom of the cylinder body (101), a heightening plate (202) arranged on one side of each set of the fixing rings (201), an extension rod (203) arranged on the inner side of the heightening plate (202), an upper clamping jaw (204) arranged on one side of the extension rod (203), and a lower clamping jaw (205) arranged in the interior of the fixing ring (201); a switching unit (300) comprising a bearing table (301) arranged on the bottom of the fixing ring (201), a plurality of sets of bosses (302) arranged in a circumferential array on the bottom of the bearing table (301), a slot hole (303) arranged on each set of the bosses (302), a tightening member (304) arranged in the interior of the slot hole (303), a driving member (305) arranged on the bottom of the tightening member (304), and a through hole (306) arranged through the center of the bearing table (301); a control rod drive mechanism (400).

2. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 1, wherein: the heightening plate (202) comprises an outer heightening plate (202a), an inner heightening plate (202b) arranged on one side of the outer heightening plate (202a), and a limiting block (202c) arranged on the outer side of the outer heightening plate (202a); the outer heightening plate (202a) comprises a support table (202a-1) arranged on the end thereof.

3. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 2, wherein: the boss (302) comprises a slotted groove (302a) arranged on one side thereof, and an arc-shaped groove (302b) arranged on one side of the slotted groove (302a).

4. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 3, wherein: the driving member (305) comprises a belt wheel (305a) arranged on the bottom of the cylinder body (101), a transmission shaft (305b) arranged on one side of the belt wheel (305a), a driving rod (305c) arranged on one side of the transmission shaft (305b), and a transmission ring (305d) arranged on one side of the driving rod (305c).

5. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 4, wherein: the driving rod (305c) comprises a driving knob (305c-1) arranged on one side thereof, and an arc-shaped protruding block (305c-2) arranged on one side of the driving knob (305c-1).

6. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 5, wherein: The fixed ring (201) comprises a receiving groove (201a) arranged on the inner wall thereof; The lower clamping jaw (205) comprises two groups of lower clamping plates (205a) arranged on both sides of the receiving groove (201a), an L-shaped connecting rod (205b) arranged at the bottom of each group of the lower clamping plates (205a), a lower pressing block (205c) arranged on one side of the L-shaped connecting rod (205b), and a spring (205d) arranged in the middle of the lower pressing block (205c).

7. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 6, characterized in that: The extension rod (203) comprises a straight rod (203a) arranged on the outer side of the outer rack high plate (202a) and the inner rack high plate (202b), a top head (203b) arranged on one side of the straight rod (203a), and a trigger rod (203c) arranged on one side of the straight rod (203a).

8. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 7, characterized in that: The upper clamping jaw (204) comprises a V-shaped connecting rod (204a) arranged on one side of the top head (203b), and an upper clamping plate (204b) arranged on one side of the V-shaped connecting rod (204a).

9. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 8, characterized in that: The lower pressing block (205c) comprises a lower pressing platform (205c-1), a pin column (205c-2) arranged at the bottom of the lower pressing platform (205c-1), a stop block (205c-3) arranged on one side of the pin column (205c-2), and a bent head (205c-4) arranged at the bottom of the pin column (205c-2).

10. The high temperature gas cooled reactor control rod drive mechanism maintenance device according to claim 9, characterized in that: The transmission ring (305d) comprises a control ring (305d-1) arranged inside the slot hole (303), a spiral protrusion (305d-2) arranged on the inner side of the control ring (305d-1), and a baffle (305d-3) arranged at the bottom of the control ring (305d-1); The trigger rod (203c) comprises a hook angle (203c-1) arranged on the spiral protrusion (305d-2).

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