CN111883267B - Drive shaft and control rod hydraulic drive system - Google Patents

Abstract

The invention relates to the technical field of nuclear reactor engineering, and provides a driving shaft and a control rod hydraulic driving system. The drive shaft includes: the outer shaft comprises a clamping groove section, the shaft core is arranged in the outer shaft, and the shaft core is suitable for moving along the axial direction of the outer shaft; the connecting device comprises a connecting piece connected to the lower end of the outer shaft and a moving piece connected to the lower end of the shaft core, wherein the connecting piece is connected with a plurality of clamping pieces, the shaft core drives the moving piece to move along the outer shaft so as to drive the clamping pieces to be switched between clamping positions which are mutually tightened and opening positions which are mutually far away. The driving shaft and the control rod hydraulic driving system are provided with the outer shaft, the shaft core and the connecting device, the connecting device can be driven to act through the movement of the shaft core, and the connecting device can be disassembled and assembled with the control rod, so that the requirements of remote butt joint and remote disassembly and assembly of the control rod and the driving shaft in a reactor refueling state are met, and technical support is provided for reactor refueling operation.

Description

Drive shaft and control rod hydraulic drive system

Technical Field

The invention relates to the technical field of nuclear reactor engineering, in particular to a driving shaft and a control rod hydraulic driving system.

Background

The hydraulic driving technology for control rod in nuclear reactor is a built-in control rod driving technology, and its driving mechanism is placed in the high-temp, high-pressure and irradiation environment of reactor pressure container, and adopts three hydraulic cylinders to drive and transfer and clamp two sets of control rod assemblies in turn so as to implement the functions of raising, lowering and dropping control rod assemblies.

Based on the working principle of a driving mechanism and the structural characteristics of the control rod of the advanced small water reactor with the thermal power of 50-300MW, the structure of the driving shaft not only needs to be matched with the action of a pin and pawl mechanism of the driving mechanism to solve the problems of deviation of initial zero position and limit of collision, but also needs to solve the problems of disassembly and assembly of the control rod and the driving shaft so as to meet the requirements of processing and transportation; it is also desirable to be able to remotely disassemble and assemble the control rod to meet the requirements for refueling. How to design the driving shaft structure to solve the problems and make the control rod built-in water pressure driving technology realize engineering application on advanced small water reactors with the thermal power of 50-300MW, which troubles technicians.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a driving shaft which is provided with an outer shaft, a shaft core and a connecting device, wherein the connecting device can be driven to act through the movement of the shaft core, the connecting device can be disassembled and assembled with a control rod, the requirements that the control rod and the driving shaft can be in remote butt joint and remote disassembly and assembly in a reactor refueling state are met, and the technical support is provided for the reactor refueling operation.

The invention also provides a hydraulic control rod driving system.

A drive shaft according to an embodiment of the first aspect of the invention includes:

an outer shaft comprising a slot section;

the shaft core is arranged in the outer shaft and is suitable for moving along the axial direction of the outer shaft;

the connecting device comprises a connecting piece connected to the lower end of the outer shaft and a moving piece connected to the lower end of the shaft core, wherein a plurality of clamping pieces are connected to the connecting piece, the shaft core drives the moving piece to move along the outer shaft so as to drive the clamping pieces to be switched between clamping positions which are tightened up and open positions which are far away from each other.

According to one embodiment of the invention, a restoring member is arranged between the shaft core and the outer shaft, one end of the restoring member is fixed to the shaft core, the other end of the restoring member is fixed to the outer shaft, and the restoring force of the restoring member is used for driving the moving member to move so as to restore the clamping member from the open position to the clamping position.

According to one embodiment of the invention, said restoring members are arranged in plurality in the axial direction of said core, at least one of said restoring members being located close to said connecting means, and at least one of said restoring members being located close to the upper end of said core.

According to one embodiment of the invention, the shaft core comprises a shaft body and a mounting and dismounting sleeve fixed at the upper end of the shaft body, a groove is formed in the outer shaft, an expansion ring is arranged in the groove, the outer shaft and the mounting and dismounting sleeve are locked through the expansion ring, and the relative positions of the shaft core and the outer shaft are locked; install and remove the upper end of cover and be equipped with the constant head tank, the lower extreme of installing and removing the cover is equipped with spacing step, the lower extreme of expander be spacing in spacing step, install and remove the cover and be located the surface of expander upper end with be equipped with the circumferential weld between the internal surface of outer axle. A instrument for dismouting outer axle and axle core can insert in the circumferential weld and insert the expander and install and remove between the cover, removes the expander to installing and removing the spacing of cover for the axle core can remove for outer axle, and then the holder can be followed the clamping position and opened to the open position.

According to one embodiment of the invention, the outer shaft comprises a clamping groove section, a first optical axis section located at the upper end of the clamping groove section and a second optical axis section located at the lower end of the clamping groove section, the clamping groove section comprises a first claw identifying section and a second claw identifying section, the first claw identifying section comprises a first groove body, the second claw identifying section comprises a second groove body, and the length of the first groove body is larger than that of the second groove body along the axial direction of the clamping groove section.

According to an embodiment of the present invention, the outer shaft includes a stopper groove between the catch groove section and the second optical axis section, and a length of the stopper groove in an axial direction of the catch groove section is greater than or equal to twice the drive shaft step length.

According to one embodiment of the present invention, a buffer lock is fixedly connected to the outer shaft, the buffer lock is located below the slot section, the buffer lock includes an upper lock body, a lower lock body and a roller, the upper lock body is fixed to the lower lock body, the roller is disposed on an outer wall of the upper lock body and/or the lower lock body, and a gap is disposed between an inner wall of the lower lock body and an outer wall of the outer shaft.

According to one embodiment of the invention, the outer shaft is divided into a plurality of sections of shaft parts along the axial direction of the outer shaft, and the adjacent two sections of shaft parts are connected through threads and are limited in the circumferential direction through fasteners;

the inner wall of the outer shaft is fixedly connected with a lock sleeve for axially limiting the restoring piece, and a gap is formed between the lock sleeve and the outer wall of the shaft core; the lock sleeve is fixed in through running through the round pin axle of outer axle the outer axle, and/or, the lock sleeve passes through the convex step of inner wall of outer axle carries out the axial spacing.

According to one embodiment of the invention, the shaft core comprises a first shaft section and a plurality of second shaft sections, two second shaft sections are connected through the first shaft section, the outer diameter of the first shaft section is smaller than that of the second shaft sections, and the restoring piece is sleeved on the outer side of each second shaft section;

and one end of the second shaft section is in threaded connection with a positioning block for axially limiting the restoring piece, and the positioning block and the second shaft section are limited in the circumferential direction through a fastening piece.

According to an embodiment of the invention, a first end of the clamping member is provided with a first surface, a second end of the clamping member is provided with a second surface, the first surface and the second surface form an included angle, in the clamping position, the moving member presses the first surface, and in the opening position, the moving member presses the second surface.

According to one embodiment of the invention, the connecting piece comprises a plurality of positioning parts which are sleeved outside the connecting shaft of the control rod, and the end parts of the positioning parts are provided with guide surfaces for guiding the connecting shaft to be inserted into the connecting piece.

According to one embodiment of the present invention, a protrusion is disposed on an outer side of the positioning portion, and the moving member is limited to the protrusion at the clamping position.

According to one embodiment of the invention, the connecting piece comprises a limiting part used for limiting the axial position of the connecting shaft of the control rod, the limiting part is connected to the inner side of the positioning part, and the connecting shaft abuts against the limiting part.

A control rod hydraulic drive system according to an embodiment of a second aspect of the present invention includes: the driving mechanism is arranged on the outer side of the clamping groove section, the buffer cylinder is sleeved on the outer side of a buffer lock on the driving shaft, and the control rod is clamped, fixed or loosened and detached through the clamping piece.

One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

the driving shaft comprises an outer shaft, a shaft core and a connecting device, wherein a moving part of the connecting device is connected to the shaft core, a connecting part of the connecting device is connected to the outer shaft, and a clamping part is rotatably connected to the connecting part; the outer axle keeps fixed, and the axle core removes for outer axle, and then the moving member removes along with the axle core, and the moving member removes the in-process and can drive the holder and rotate the regulation, and the holder switches between the clamping position of drawing in each other and the open position of keeping away from each other, can make the connecting axle of holder centre gripping control rod or loosen the connecting axle, and then realize the dismouting of drive shaft and control rod.

The driving shaft of the embodiment realizes the detachable connection of the control rod and the driving shaft, realizes the engineering and the productization, ensures the engineering application of the control rod built-in water pressure driving technology, is one of the series engineering implementation technologies of the control rod built-in driving technology, and mainly meets the engineering application of the control rod built-in water pressure driving technology. Based on the working principle of a driving mechanism and the structural characteristics of the control rod of the advanced small water reactor with the thermal power of 50-300MW, the requirement that the control rod and the driving shaft can be separated is met, so that the requirements of large-size processing and transportation are met; meanwhile, the connecting device enables the control rod and the driving shaft to be firmly connected, meets the requirements of remote butt joint and remote disassembly and assembly of the control rod and the driving shaft in the reactor refueling state, and provides technical support for reactor refueling operation.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic perspective view of a drive shaft according to an embodiment of the present invention;

FIG. 2 is a schematic front view of a drive shaft provided in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional structural schematic view of a drive shaft provided by an embodiment of the present invention;

FIG. 4 is a schematic view of a portion A of FIG. 1;

FIG. 5 is a partially enlarged view of the portion B in FIG. 3;

FIG. 6 is a partial enlarged view of the portion C in FIG. 3;

FIG. 7 is a schematic view of a portion I of FIG. 1;

FIG. 8 is a cross-sectional structural schematic view of a drive shaft provided in accordance with an embodiment of the present invention; the difference from fig. 3 is that the structure of the slot segments is significantly shortened and the relative positions of the two repetitions are illustrated;

FIG. 9 is a schematic structural view taken at section D-D of FIG. 8, showing the shaft core and the first sleeve;

FIG. 10 is an enlarged partial view of the portion E in FIG. 8;

FIG. 11 is a schematic structural view of an expander of a drive shaft provided by an embodiment of the present invention;

FIG. 12 is a schematic structural view of a first shaft member of the drive shaft provided by the embodiment of the present invention;

FIG. 13 is a cross-sectional structural view of the first shaft member of the driveshaft provided in accordance with an embodiment of the present invention; each function section of the card slot section is divided in the figure;

FIG. 14 is an enlarged partial view of the portion F of FIG. 13;

FIG. 15 is an enlarged partial view of the structure of FIG. 13 at H;

FIG. 16 is a schematic cross-sectional view of a drive mechanism for use with a drive shaft provided in accordance with an embodiment of the present invention;

FIG. 17 is a schematic structural view of a control rod to which the drive shaft is adapted to be connected according to an embodiment of the present invention.

Reference numerals:

1: an outer shaft; 11: a first shaft member; 111: expanding rings; 12: a second shaft member; 13: a third shaft member; 131: a first chute;

14: a slot clamping section; 141: a first claw recognizing section; 1411: a claw recognizing section is transmitted; 1412: clamping a claw recognizing section; 1413: a first tank body; 1414: a first flute; 1415: a first upper section; 1416: a third connection section; 1417: a first lower section; 1418: a first connection section; 142: a second claw recognizing section; 1421: short section; 1422: a long section; 1423: a second tank body; 1424: a second flute; 1425: a second upper section; 1426: a fourth connection section; 1427: a second lower section; 1428: a second connection section;

15: a first optical axis segment; 16: a limiting groove; 17: a second optical axis segment; 18: a first lock sleeve; 181: a fourth fixing pin; 182: a locking rod; 19: a second lock sleeve;

2: a shaft core; 21: a shaft body; 211: a first positioning block; 212: a first fixing pin; 213: a second fixing pin; 214: a second positioning block; 215: a third positioning pin; 216: a limiting sleeve; 22: assembling and disassembling the sleeve; 221: positioning a groove;

3: a connecting device; 31: a connecting member; 311: a positioning part; 3111: a guide surface; 312: a limiting part; 313: a projection; 314: rotating the connecting piece; 32: a clamping member; 321: a first surface; 322: a second surface; 323: a clamping part; 33: a moving member; 331: a second chute; 332: a first fastener;

4: a recovery member; 41: a shaft spring; 42: a locking spring;

5: a buffer lock; 51: an upper lock body; 52: a lower lock body; 53: a roller;

6: a drive mechanism; 61: a lift cylinder; 62: a transfer cylinder; 63: a clamping cylinder; 64: a transfer claw; 65: a gripper jaw;

7: a control rod; 71: a connecting shaft; 711: a groove;

a: a first length; b: a second length.

Detailed Description

Embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the embodiments of the present invention, it should be noted that the terms "central", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

One embodiment of the present invention, as shown in fig. 1 to 17, provides a drive shaft including: an outer shaft 1, a shaft core 2 and a connecting device 3. The shaft core 2 is arranged in the outer shaft 1, and the shaft core 2 is suitable for moving along the axial direction of the outer shaft 1; the connecting device 3 comprises a connecting part 31 connected to the lower end of the outer shaft 1 and a moving part 33 connected to the lower end of the shaft core 2, the connecting part 31 is connected with a plurality of clamping parts 32, and the shaft core 2 moves along the outer shaft 1 by driving the moving part 33 so as to drive the plurality of clamping parts 32 to be switched between clamping positions which are mutually tightened and opening positions which are mutually far away.

When the control rod 7 needs to be connected with the drive shaft, the shaft core 2 is moved upward in the axial direction of the outer shaft 1 (i.e., the shaft core 2 is pulled upward to pull up the moving member 33 with respect to the connecting member 31 as shown in fig. 6 to 7), and the moving member 33 is moved in the axial direction of the connecting member 31 under the driving power of the shaft core 2 to place the grippers 32 in the open position, and the connecting shaft 71 of the control rod 7 is inserted between the plurality of grippers 32; at this time, referring to fig. 7 to 6, the shaft core 2 moves downward again in the axial direction of the outer shaft 1, the moving member 33 moves downward, so that the clamping members 32 are adjusted from the open position to the clamping position, the clamping members 32 are folded under the sleeving pressure of the moving member 33 to limit the connecting shaft 71 between the plurality of clamping members 32, and the connecting shaft 71 is limited and fixed by the plurality of clamping members 32, thereby realizing the fixed connection of the control rod 7 and the driving shaft. If the control rod 7 needs to be detached from the drive shaft, the clamp is adjusted from the clamping position to the open position. Relative movement through axle core 2 and outer axle 1 realizes the dismouting of control rod 7 and drive shaft, and the accessible has realized remote dismouting control rod 7 and drive shaft at the top drive axle core 2 removal of axle core 2.

Wherein the end of the control rod 7 connected to the drive shaft is understood to be the lower end, and the upper end of the drive shaft is close to the upper end of the reactor pressure vessel. The connecting shaft 71 is provided with a groove 711, and the clamping member 32 is provided with a clamping part 323 matched with the groove 711.

Based on the working principle of a driving mechanism and the structural characteristics of the control rod of the advanced small water reactor with the thermal power of 50-300MW, the requirement that the control rod and the driving shaft can be separated is met, so that the requirements of large-size processing and transportation are met; meanwhile, the connecting device 3 enables the control rod 7 and the driving shaft to be firmly connected, meets the requirements of long-distance butt joint and long-distance disassembly and assembly of the control rod 7 and the driving shaft in the reactor refueling state, and provides technical support for reactor refueling operation.

The drive shaft of the embodiment realizes the detachable connection of the control rod 7 and the drive shaft, realizes engineering and productization, ensures the engineering application of the control rod built-in water pressure drive technology, is one of the series engineering implementation technologies of the control rod built-in drive technology, mainly meets the engineering application of the control rod built-in water pressure drive technology, and provides a choice for the engineering design of remote detachable connection structures in other industrial fields. Wherein, referring to fig. 17, the control rods 7 may be cross wing control rods.

An example of the structure of the outer shaft 1 to be fitted to the shaft core 2 is provided below.

In one embodiment, a restoring member 4 is disposed between the axial core 2 and the outer shaft 1, one end of the restoring member 4 is fixed to the axial core 2, the other end of the restoring member 4 is fixed to the outer shaft 1, and the restoring force of the restoring member 4 is used to drive the moving member 33 to move, so as to restore the holding member 32 from the open position to the holding position.

When the clamping piece 32 needs to be switched from the clamping position to the opening position, the moving piece 33 is driven to move through the axial movement of the shaft core 2, the moving power of the shaft core 2 can be provided through external force, and the resistance of the restoring piece 4 needs to be overcome in the process of upward movement of the shaft core 2. When the driving force of the upward movement of the spindle 2 is released, the restoring force of the restoring member 4 drives the spindle 2 to move downward to restore the holding member 32 from the open position to the holding position.

Wherein, the return element 4 can be an elastic element, such as a spring, an elastic air bag, etc. The restoring piece 4 is sleeved on the outer side of the shaft core 2, so that the stress of the restoring piece 4 is more balanced and stable.

In one embodiment, the restoring members 4 are provided in plurality in the axial direction of the shaft core 2, at least one restoring member 4 is provided near the connecting means 3, and at least one restoring member 4 is provided near the upper end of the shaft core 2. A return element 4, close to the connection means 3, which contributes to stably driving the moving element 33 in motion; the restoring piece 4 close to the upper end of the shaft core 2 is far away from the control rod 7 and the reactor core, so that the irradiation influence of nuclear radiation on the restoring piece 4 is reduced.

When the nuclear reactor is operated to the later stage (close to the design life of the nuclear reactor), the restoring force of the restoring piece close to the control rod 7 can be reduced by 60-70%, so that other restoring pieces are required to be far away from the control rod 7 as far as possible, the loss of nuclear radiation to parts is reduced, and the normal operation of the nuclear reactor at the later stage is ensured.

Referring to fig. 8, the restoring member 4 is provided with two, respectively, a lock spring 42 near the coupling device 3 and a shaft spring 41 near the upper end of the drive shaft. Generally, the length of the lock spring 42 is greater than the length of the shaft spring 41, so that the restoring force of the lock spring 42 is greater than the restoring force of the shaft spring 41, which helps to stably drive the clamping member 32 from the open position to the clamping position.

In one embodiment, referring to fig. 7 and 11, the shaft core 2 includes a shaft body 21 and a mounting and dismounting sleeve 22 fixed on the upper end of the shaft body 21, a groove 711 is provided in the outer shaft 1, an expansion ring 111 is provided in the groove 711, and the outer shaft 1 and the mounting and dismounting sleeve 22 are locked by the expansion ring 111 to meet the requirement of the normal operation condition of the reactor. The mounting/dismounting sleeve 22 serves to reinforce the strength of the shaft body 21 and facilitates the fixation of the shaft body 21 to the outer shaft 1.

The upper end of the assembling and disassembling sleeve 22 is provided with a positioning groove 221, the positioning groove 221 is positioned above the outer shaft, the positioning groove 221 is used for fixing tools for disassembling the outer shaft 1 and the shaft core 2, and the structure is simple. The lower end of the mounting and dismounting sleeve 22 is provided with a limit step, the lower end of the expansion ring is limited on the limit step, and a circular seam is arranged between the outer surface of the mounting and dismounting sleeve at the upper end of the expansion ring and the inner surface of the outer shaft. In the process of releasing the expansion and fixation of the mounting and dismounting sleeve 22 by the expander 111, a tool needs to be inserted downwards along the circular seam at the top of the outer shaft 1 until the tool is inserted between the expander 111 and the outer wall of the mounting and dismounting sleeve 22, the fixing of the mounting and dismounting sleeve 22 and the outer shaft by the expander 111 is released, and the shaft core 2 is pulled to move by external force.

When the shaft core 2 and the outer shaft 1 are fixed, the expansion ring 111 is expanded on the assembly and disassembly sleeve 22, and at the moment, a gap is formed between the expansion ring 111 and the groove 711 of the outer shaft 1, so that the expansion ring 111 can be conveniently expanded into the groove 711. The inner wall of the expander 111 is provided with a protrusion to ensure the expansion force of the expander 111 to the shaft core 2.

The assembly and disassembly sleeve 22 is fixedly connected with the shaft body 21 through threads, the axial direction and the circumferential direction are reinforced and limited through the second fixing pin 213, and the shaft body 21 and the fixing sleeve are fixedly connected through the second fixing pin 213 which inclines downwards. Meanwhile, the shaft body 21 is further connected with a first positioning block 211, and the first positioning block 211 is in threaded connection with the shaft body 21 and is reinforced and fixed through a first fixing pin 212. The upper end of the first positioning block 211 abuts against the detachable sleeve 22 to enhance the stability of the shaft core 2.

In one embodiment, the outer shaft 1 is provided with a step therein, the lower end of the sleeve 22 is retained by the step, and the upper end of the sleeve 22 extends out of the outer shaft 1. The lower end of the assembling and disassembling sleeve 22 is used for positioning the relative position of the outer shaft 1 and the shaft core 2, and the position is limited by a step, so that the structure is simple and the processing is convenient. The upper end of the assembling and disassembling sleeve 22 extends out of the outer shaft 1, so that the shaft core 2 and the outer shaft 1 can be conveniently assembled and disassembled.

An example of the structure of the outer shaft 1 is provided below.

In one embodiment, the outer shaft 1 includes a slot section 14, a first optical axis section 15 located at the upper end of the slot section 14, and a second optical axis section 17 located at the lower end of the slot section 14, the slot section 14 includes a first tab identifying section 141 and a second tab identifying section 142, the first tab identifying section 141 includes a first slot 1413, the second tab identifying section 142 includes a second slot 1423, and the length of the first slot 1413 is greater than the length of the second slot 1423 along the axial direction of the slot section 14.

The slot section 14 comprises a plurality of slots, and the slots are used for providing a clamping space with the pin claws of the driving mechanism 6 so that the pin claws of the driving mechanism 6 tightly grasp the fixed driving shaft and drive the driving shaft to be lifted and adjusted through the driving mechanism 6. Referring to fig. 16, the pin claw of the drive mechanism 6 includes a transfer claw 64 and a gripping claw 65, the transfer cylinder 62 of the drive mechanism 6 controls switching between the first gripping position and the first unlocking position of the transfer claw 64, and the gripping cylinder 63 of the drive mechanism 6 controls switching between the second gripping position and the second unlocking position of the gripping claw 65.

The principle of the movement of the drive shaft in the ascending process is the same as that in the descending process, and the driving mechanism 6 is used to drive the drive shaft to ascend. When the transmission claw 64 is in a first grasping position (at this time, the holding claw 65 is in a second unlocking position) that is grasped and fixed with the groove body (the first groove body 1413 or the second groove body 1423) of the driving shaft, under the action of the lifting power of the lifting cylinder 61 of the driving mechanism 6, the transmission cylinder 62 and the transmission claw 64 drive the driving shaft to lift upwards, the driving shaft finishes one-time lifting, then, the holding claw 65 grasps the groove body corresponding to the holding claw 65 (that is, the holding claw 65 is in the second grasping position, the groove body is the first groove body 1413 or the second groove body 1423), so as to fix the driving mechanism 6 and the driving shaft, the lifting cylinder 61 and the transmission cylinder 62 return to the initial positions, the transmission claw 64 is switched to the first unlocking position, the transmission claw 64 is switched to the first grasping position again under the driving of the transmission cylinder 62, and the above-mentioned process is repeated, and then the next lifting motion can be performed.

Wherein, the motion process of drive shaft is step motion, and the distance of once rising is a step length, namely: the gripper jaws 65 grip onto the next slot body immediately adjacent to the previous slot body between one lifting movement of the drive shaft and the next lifting movement. It should be noted that the structure, shape and size of the transmission claw 64 and the clamping claw 65 are generally the same, so that the grooves at different positions in the axial direction of the driving shaft can simultaneously meet the clamping requirements of the transmission claw 64 and the clamping claw 65.

In the driving shaft of the embodiment, the groove bodies include a first groove body 1413 of the first claw identifying section 141 and a second groove body 1423 of the second claw identifying section 142, and along the axial direction of the notch section 14, the length of the first groove body 1413 is greater than that of the second groove body 1423, the first groove body 1413 can be understood as a wide groove, and the second groove body 1423 can be understood as a narrow groove, where the wide and narrow means different lengths along the axial direction of the notch section 14. For the second trough body 1423, the first trough body 1413 can provide sufficient clamping allowance for the transmission claw 64 and the clamping claw 65, and even if the transmission claw 64 or the clamping claw 65 cannot accurately correspond to the first trough body 1413, the first trough body 1413 can also provide sufficient space to ensure that the transmission claw 64 and the clamping claw 65 can accurately enter the first trough body 1413 and clamp the driving shaft, so as to ensure that the driving mechanism 6 is clamped and fixed with the driving shaft. The space of the second slot 1423 can also provide a required clamping space for the transfer claw 64 and the clamping claw 65, so that the clamping requirement of the transfer claw 64 and the clamping claw 65 is met, and the space of the second slot 1423 is slightly smaller than that of the first slot 1413. Here, the first catching section 141 corresponds to an initial catching region of the transfer claw 64 and the gripping claw 65, which can be understood as a region position before the raising movement, and the initial catching region corresponds to a lower position of the drive shaft (a region gradually raised by several step lengths from the lowest position). Referring to fig. 13, the first catching segment 141 is disposed at a position above the catch groove segment 14. The first locking section 141 may be distributed in multiple sections at intervals in the axial direction of the slot section 14.

According to the driving shaft of the embodiment, the first claw identifying section 141 and the second claw identifying section 142 are arranged, so that the transmission claw 64 and the clamping claw 65 of the driving mechanism 6 can stably grasp the driving shaft, the problem of initial zero position deviation between the driving shaft and a pin claw is solved, and the performance and the reliability of the driving mechanism 6 are improved.

Referring to fig. 13, the first optical axis section 15 is located above the slot section 14, and the second optical axis section 17 is located below the slot section 14, so that the driving shaft can be lifted stably by the structural design of the slot section 14, and the control rod 7 can be detached quickly.

In one embodiment, referring to fig. 13 and 15, the outer shaft 1 includes a limiting groove 16, the limiting groove 16 is located between the slot section 14 and the second optical axis section 17, and the length of the limiting groove 16 along the axial direction of the slot section 14 is greater than or equal to two times of the driving shaft stepping length, so as to solve the problem of driving shaft falling collision due to misoperation or other factors when the driving shaft is at the highest rod position.

Referring to fig. 13 and 15, the transfer claw 64 is located above the clamping claw 65, when the driving shaft is raised to the highest position, that is, the clamping claw 65 is located at the lowest position of the notch section 14, and the clamping claw 65 is clamped in the last flute of the notch section 14 (that is, the clamping claw 65 extends into the limiting groove 16), at this time, if the lifting cylinder 61 and the transfer cylinder 62 lift the driving shaft again, after the driving shaft rises again, the clamping claw 65 needs to extend into the limiting groove 16 again for clamping, at this time, because the length of the limiting groove 16 is greater than or equal to the length of the driving shaft in two steps, the clamping claw 65 can extend into the limiting groove 16 again, and the driving shaft descends downwards by a step length under the action of gravity to enable the clamping claw 65 to clamp the last flute again, so as to avoid the driving shaft from falling to cause a crash accident.

It should be noted that, if the holding claw 65 is located above the transfer claw 64, when the driving shaft is raised to the highest position, the transfer claw 64 is located at the lowest position of the slot section 14, and by providing the limiting slot 16, the principle of fixing the driving shaft by the transfer claw 64 is the same as that of the holding claw 65, and will not be described herein again. In this embodiment, the vertical orientation of the holding claw 65 and the transfer claw 64 is not limited.

In one embodiment, as shown in fig. 13 and 14, the notch section 14 comprises a first notch 1414 and a second notch 1424, adjacent two first notches 1414 are connected by a first connecting section 1418 and bound a first groove 1413, and adjacent two second notches 1424 are connected by a second connecting section 1428 and bound a second groove 1423; in the axial direction of the notch section 14, the sum of the lengths of the first flute 1414 and the first connecting section 1418 is set to a first length a, and the sum of the lengths of the second flute 1424 and the second connecting section 1428 is set to a second length b, and the first length a is equal to the second length b.

The first length a and the second length b can be understood as a stepping length, and the first claw identifying section 141 and the second claw identifying section 142 have the same stepping length, so that the same stepping length of the driving shaft is ensured, the transmission claw 64 and the clamping claw 65 can accurately enter the groove body, and the problem of dislocation between the claw and the groove is avoided.

In one embodiment, the length of the first connecting section 1418 is greater than the length of the second connecting section 1428 in the axial direction of the slot section 14, such that the length of the first slot 1413 is greater than the length of the second slot 1423; in the axial direction of the card slot section 14, the length of the first flute 1414 is less than the length of the second flute 1424 to ensure that the first length a is the same as the second length b, i.e., the step length is the same.

When the first groove body 1413 and the second groove body 1423 are annular grooves in the following embodiments, the first connecting section 1418 and the second connecting section 1428 are cylindrical structures, the first groove pattern 1414 can be understood as a narrow ring, and the second groove pattern 1424 can be understood as a wide ring, that is, the groove body and the groove pattern corresponding to the first claw identifying section 141 are a wide groove narrow ring, and the groove body and the groove pattern corresponding to the second claw identifying section 142 are a narrow groove wide ring, so as to ensure that the first length a is equal to the second length b, and further ensure that the driving shaft is accurately stepped. The structural strength of the narrow-groove wide rings is superior to that of the wide-groove narrow rings, and as shown in fig. 13, the number of the narrow-groove wide rings is greater than that of the wide-groove narrow rings, so that the structural strength of the driving shaft is improved on the basis of ensuring accurate clamping of the transmission claws 64 and the clamping claws 65.

In one embodiment, as shown with reference to fig. 13 and 14, the first flute 1414 includes a first upper section 1415, a first lower section 1417, and a third connecting section 1416 connecting the first upper section 1415 with the first lower section 1417, and the second flute 1424 includes a second upper section 1425, a second lower section 1427, and a fourth connecting section 1426 connecting the second upper section 1425 with the second lower section 1427; the length of the third connecting section 1416 is less than the length of the fourth connecting section 1426 along the axial direction of the chuck groove section 14, and the lengths of the first upper section 1415, the first lower section 1417, the second upper section 1425 and the second lower section 1427 are the same. The difference in the lengths of the first flute 1414 and the second flute 1424 is achieved by the difference in the lengths of the third connecting segment 1416 and the fourth connecting segment 1426, which helps to simplify the structure of the first flute 1414 and the second flute 1424, making the first flute 1414 and the second flute 1424 easier to process.

When the groove body is an annular groove, the third connecting section 1416 and the fourth connecting section 1426 are cylindrical and have the same radial dimension, except that the lengths in the axial direction of the driving shaft are different. The first upper section 1415 and the second upper section 1425 are also identical in shape, and the first lower section 1417 and the second lower section 1427 are also identical in shape. The surface of the first upper section 1415 is a slope inclined upward along the third connecting section 1416 and toward the center line of the driving shaft, and the surface of the second upper section 1425 is a slope inclined upward along the fourth connecting section 1426 and toward the center line of the driving shaft; the surface of the first lower section 1417 is sloped obliquely downward and toward the center of the drive shaft along the third connecting section 1416, and the surface of the second lower section 1427 is sloped obliquely downward and toward the center of the drive shaft along the fourth connecting section 1426.

Wherein, along the axial direction of the slot segment 14, the length of the first connecting segment 1418 is the same as that of the fourth connecting segment 1426, and the length of the second connecting segment 1428 is the same as that of the third connecting segment 1416. The difference in length between the first 1418 and second 1428 connecting segments can be selected as desired. Referring to fig. 13 and 14, the second connecting section 1428 has a length that is two-thirds of the length of the first connecting section 1418.

In one embodiment, as shown in fig. 13 and 14, the first groove 1413 and the second groove 1423 are both configured as annular grooves, which are convenient to machine, and the circumferential space of the annular grooves is flexible, so that the circumferential deviation position of the transfer claw 64 or the clamping claw 65 can be effectively solved.

The plurality of transmission claws 64 and the plurality of holding claws 65 are arranged in the circumferential direction of the driving mechanism 6, the first groove body 1413 and the second groove body 1423 are annular grooves, and the plurality of transmission claws 64 and the plurality of holding claws 65 can extend into one first groove body 1413 or one second groove body 1423. Similarly, the limiting groove 16 is also provided as an annular groove.

Certainly, the first groove 1413 and the second groove 1423 are not limited to be annular grooves, and the first groove 1413 and the second groove 1423 can meet the clamping requirement of the transfer claw 64 and the clamping claw 65.

In one embodiment, the surfaces of the first upper section 1415, the first lower section 1417, the second upper section 1425, and the second lower section 1427 are tapered, which facilitates machining. The first upper section 1415 and the second upper section 1425 are both forward tapered slopes, the first lower section 1417 and the second lower section 1427 are both reverse tapered slopes, and the tapers of the first upper section 1415, the first lower section 1417, the second upper section 1425 and the second lower section 1427 are the same, so that the processing is convenient.

In one embodiment, referring to fig. 13, the first gripper segment 141 includes a transfer gripper segment 1411 corresponding to the transfer gripper 64 and a gripper segment 1412 corresponding to the gripper 65, the gripper segment 1412 has a short segment 1421 and a long segment 1422 of the second gripper segment 142 at two ends, respectively, and the short segment 1421 is located between the transfer gripper segment 1411 and the gripper segment 1412. When the driving shaft is at a lower position, the transfer claw section 1411 corresponds to the position of the transfer claw 64, and the holding claw section 1412 corresponds to the position of the holding claw 65, so as to ensure that the transfer claw 64 and the holding claw 65 can be accurately clamped in the notch section 14 in the initial stage. In the axial direction of the drive shaft, a space is provided between the transmission claw 64 and the holding claw 65, that is, a space is provided between the transmission claw identifying section 1411 and the holding claw identifying section 1412, and a short section 1421 of the second claw identifying section 142 is provided between the transmission claw identifying section 1411 and the holding claw identifying section 1412.

The length of the second gripper segment 142 between the transfer gripper segment 1411 and the gripper segment 1412 may be set as needed, and as shown in fig. 13, the distance between the transfer gripper segment 1411 and the gripper segment 1412 is not large, the length of the second gripper segment 142 between the transfer gripper segment 1411 and the gripper segment 1412 is short and may be referred to as a short segment 1421, and the length of the second gripper segment 142 between the gripper segment 1412 and the stopper groove 16 is long and may be referred to as a long segment 1422.

In one embodiment, referring to fig. 1 to 5, a slot section 14 for adapting to the driving mechanism 6 is provided on the outer shaft 1, and a buffer lock 5 is provided below the slot section 14. The buffer lock 5 component is matched with the drive wire buffer cylinder, so that the falling rod buffer function of the cross wing control rod is realized. Wherein, the buffering lock 5 is arranged on the second optical axis section 17, and the installation is convenient.

In one embodiment, the outer shaft 1 comprises a first shaft part 11 provided with a clamping groove section 14 and a second shaft part 12 connected to the lower end of the first shaft part 11, and the buffer lock 5 is fixedly connected to the position where the first shaft part 11 is butted with the second shaft part 12. The slot section 14 is adapted to fit with the drive mechanism 6, and the position of the drive mechanism 6 corresponds to the slot section 14. The buffer lock 5 is located below the slot section 14, that is, the buffer lock 5 is installed below the driving mechanism 6, and the driving mechanism 6 is located above to facilitate disassembly and maintenance.

In addition, the length of the driving shaft of the embodiment is long enough, and the cushion lock 5 is positioned below the driving mechanism 6, so that the requirement that the cushion lock 5 is far away from the reactor core can be met, and the driving shaft is suitable for onshore reactors.

In one embodiment, as described with reference to fig. 4 and 5, the buffer lock 5 is fixedly connected to the outer shaft 1, the buffer lock 5 is located below the slot section, the buffer lock 5 includes an upper lock body 51 and a lower lock body 52, and the upper lock body 51 and the lower lock body 52 are fixed by screws, which is simple in structure. Go up lock body 51 and all be equipped with gyro wheel 53 on the lock body 52 down, gyro wheel 53 locates the outer wall of buffering lock 5, makes things convenient for buffering lock 5 and buffer tube cooperation, reduces the friction. A gap is formed between the inner wall of the lower lock body 52 and the outer wall of the outer shaft 1, fluid in the buffer cylinder flows into the gap, and the fluid in the gap can effectively form water damping resistance to realize control rod drop buffering speed limiting and braking. Wherein, the clearance is the open structure, helps the fluid to get into.

In one embodiment, the outer shaft is divided into a plurality of sections of shaft parts along the axial direction of the outer shaft, the adjacent two sections of shaft parts are connected through threads and limited circumferentially through fasteners, the axial length of a single part can be shortened through the plurality of sections of shaft parts, the processing and the transportation are convenient, the connecting mode between the shaft parts at two ends is simple, the dismounting is convenient, and the cost is reduced. Wherein, the fastener can be screw, nut isotructure.

In one embodiment, when the outer shaft 1 includes a first shaft 11, a second shaft 12 and a third shaft 13, a slot section 14 is disposed on the first shaft 11, a first optical axis section 15 is disposed at the upper end of the first shaft 11, the lower end of the first shaft 11 is an optical axis, and both the second shaft 12 and the third shaft 13 are optical axes, so that the optical axis at the lower end of the slot section 14 can be understood as a second optical axis section 17. The first shaft element 11, the second shaft element 12 and the third shaft element 13 are connected in sequence, can be connected by screw threads and can be fixed by pin reinforcement. The outer shaft 1 is arranged in sections, and processing and transportation are facilitated.

In one embodiment, a locking sleeve for axially limiting the restoring piece is fixedly connected to the inner wall of the outer shaft, so that the outer shaft can axially limit the restoring piece. A gap is arranged between the lock sleeve and the outer wall of the shaft core, so that the shaft core is prevented from rubbing, and the smooth movement of the shaft core is ensured.

The locking sleeve and the outer shaft can be fixed in various ways, and the following two connection ways can be adopted, but the locking sleeve and the outer shaft are not limited to the following connection ways. The lock sleeve can be fixed on the outer shaft through a pin shaft penetrating through the outer shaft, so that the lock sleeve is stable in fixation and convenient to disassemble and assemble; the lock sleeve can also carry out axial spacing through the convex step of the inner wall of the outer shaft, has simple structure and needs to be matched with the structure of the shaft core.

Wherein, the number of the lock sleeves is the same as that of the return pieces. Referring to the above embodiment, the return member includes a shaft spring and a bolt, and the lock sleeve includes a first lock sleeve and a second lock sleeve.

In one embodiment, the shaft core 2 is also divided into a plurality of sections along the axial direction, so that the processing is convenient, and the two adjacent sections can be fixed by welding. The diameters of different axial positions of the shaft core are different; the shaft core comprises a first shaft section and a plurality of second shaft sections, the outer diameter of the first shaft section is smaller than that of the second shaft sections, the restoring pieces are sleeved on the outer sides of the second shaft sections, the strength of the second shaft sections is enhanced, and the thickness of the outer shaft is smaller at the moment; if the outer axle is directly established to the direct cover in the outside of first shaft segment, then the external diameter of first shaft segment is less than the external diameter of second shaft segment, and the thickness of outer axle here is great, guarantees the intensity of drive shaft. The shaft body of the shaft core is of a solid structure.

In one embodiment, one end of the second shaft section is in threaded connection with a positioning block for axially limiting the restoring piece, the positioning block and the second shaft section are circumferentially limited through a fastener, the positioning block is simple and convenient to fix, the assembly and disassembly are convenient, and the fixing stability of the positioning block and the shaft core is effectively guaranteed.

In one embodiment, the shaft core 2 can move along the axial direction of the outer shaft 1, a limiting sleeve 216 (a structural form of the positioning block) is fixedly sleeved outside the shaft core 2, the locking spring 42 is sleeved outside the shaft core 2, one end of the locking spring 42 abuts against the limiting sleeve 216, the other end of the locking spring 42 is limited on the second locking sleeve 19, and the second locking sleeve 19 is fixed on the outer shaft 1, so that the connection between the locking spring 42 and the shaft core 2 and the outer shaft 1 is realized. The second lock sleeve 19 is upwardly limited by the limit step on the outer shaft 1, the lower end of the second lock sleeve 19 is supported by the lock spring 42, and the second lock sleeve 19 is fixed in a simple manner.

Referring to fig. 8 to 10, the lower end of the shaft spring 41 is limited to the shaft core 2 by a second positioning block 214, the second positioning block 214 is screwed to the shaft core 2 and reinforced by a third positioning pin 215, and a gap is provided between the second positioning block 214 and the inner wall surface of the outer shaft 1 to reduce friction between the second positioning block 214 and the outer shaft 1. The upper end of shaft spring 41 is limited by first lock sleeve 18, first lock sleeve 18 is fixedly connected to outer shaft 1 through fourth fixing pin 181, and fourth fixing pin 181 is strengthened fixedly through locking bar 182, and the fixed stability of first lock sleeve 18 and outer shaft 1 is guaranteed.

An embodiment of the connecting device 3 is provided below.

In one embodiment, as shown in fig. 1 to 3, 6 and 7, a first end of the holding member 32 is provided with a first surface 321, a second end of the holding member 32 is provided with a second surface 322, the first surface 321 forms an angle with the second surface 322, the moving member 33 presses the first surface 321 in the holding position, and the moving member 33 presses the second surface 322 in the opening position.

The first surface 321 and the second surface 322 form an acute angle, and the first surface 321 and the second surface 322 are sleeved by the moving member 33 to perform an external force, so that the clamping member 32 rotates and is adjusted, and the clamping member 32 is switched between the clamping position and the opening position. The angles of the first surface 321 and the second surface 322 at the two ends of the clamping member 32 are different, in order to make the moving member 33 fit outside the first surface 321, the clamping member 32 makes the first surface 321 fit the inner wall of the moving member 33 by rotating relative to the connecting member 31, and the rotating process of the clamping member 32 makes the clamping member 32 switch between the clamping position and the opening position; similarly, in order to make the moving member 33 fit outside the second surface 322, the holding member 32 also rotates relative to the connecting member 31, and the holding member 32 rotates, so that the holding member 32 is switched between the holding position and the open position.

In one embodiment, as shown in fig. 1 to 3, 6 and 7, the link 31 includes a plurality of positioning parts 311 for sheathing the outside of the connecting shaft 71 of the control rod 7, and ends of the plurality of positioning parts 311 are provided with guide surfaces 3111 to guide the insertion of the connecting shaft 71 into the link 31.

The positioning portion 311 is used for limiting and positioning the connecting shaft 71, so as to ensure that the connecting shaft 71 is accurately positioned in the connecting member 31, and the guide surface 3111 can guide the connecting shaft 71 to be quickly and accurately inserted into the connecting member 31.

In one embodiment, the guide surface 3111 is formed as an arc surface to form an open structure at the end of the connection member 31, and the guide effect is good and the structure is simple.

Wherein the arc surface is a spherical surface, the guiding effect of the spherical surface is good, and the contact resistance is reduced. The positioning part 311 is provided in plurality on the connecting member 31, and the number of the positioning parts 311 is the same as that of the clamping members 32. The positioning parts 311 are uniformly arranged in four in the circumferential direction of the connecting member 31, and the guide surfaces 3111 are arranged so that the ends of the positioning parts 311 form an inner-sphere outer-cone structure, which facilitates the long-distance butt joint of the drive shaft and the control rod 7.

Of course, the guide surface 3111 is not limited to an arc surface, but may be an inclined plane, and the end of the connecting member 31 may be formed to be open to play a guiding role.

In one embodiment, the outer side of the positioning portion 311 is disposed on the protrusion 313, and the moving member 33 is limited on the protrusion 313 at the clamping position. The protruding portion 313 limits and positions the moving member 33, and ensures that the moving member 33 accurately corresponds to the second surface 322 of the clamping member 32, so that the moving member 33 is accurately sleeved on the outer side of the second surface 322, and meanwhile, the protruding portion 313 also plays a role in supporting the moving member 33.

The protrusion 313 in this embodiment, together with the first sliding slot 131 in the following embodiments and the second sliding slot 331 in the following embodiments, has a dual function of limiting and positioning the moving member 33, so that the position of the moving member 33 is more stable.

In one embodiment, the connection member 31 includes a stopper portion 312 for limiting the axial position of the connection shaft 71 of the control rod 7, the stopper portion 312 is connected inside the positioning portion 311, and the connection shaft 71 abuts against the stopper portion 312 so that the clamp 32 clamps the connection shaft 71. When the connecting shaft 71 is inserted into the connecting member 31, the limiting portion 312 limits the height of the connecting shaft 71, so that the groove 711 in the connecting shaft 71 accurately corresponds to the clamping portion 323 in the clamping member 32, the clamping deviation of the clamping member 32 is reduced, and the clamping accuracy of the clamping member 32 is improved.

The stopper 312 is a block structure inside the connector 31, and the top surface of the connecting shaft 71 abuts against the lower surface of the stopper 312.

In one embodiment, the clamping member 32 is disposed between two positioning portions 311, and two ends of the clamping member 32 are respectively rotatably connected to the positioning portions 311 on one side thereof. The clamping piece 32 is matched with the positioning part 311, and meanwhile, the connecting shaft 71 is circumferentially limited, and the clamping piece 32 is convenient to mount. Wherein the clamping member 32 is rotatably connected to the connecting member 31 by a rotary connecting member 314.

In one embodiment, as shown in fig. 6 and 7, the moving member 33 is fixedly connected to the stop collar 216 in the above-described embodiment by a first fastener 332. The third shaft element 13 of the outer shaft 1 is provided with a first sliding slot 131 extending along the axial direction of the outer shaft 1, the first fastening member 332 penetrates through the first sliding slot 131, and the first fastening member 332 can move along the extending direction of the first sliding slot 131. The first sliding groove 131 guides and limits the moving process of the moving piece 33, and is simple in structure and convenient to machine. Wherein, the first fastening member 332 is prevented from loosening from the moving member 33 by spot welding. One or more first sliding grooves 131 are provided on the third shaft member 13, and the number of the first sliding grooves 131 can be selected as needed.

In the open position, the first fastening member 332 is positioned at the first end of the first sliding chute 131, and in the clamping position, the first fastening member 332 is positioned at the second end of the first sliding chute 131 to ensure the relative fixation of the third shaft member 13 and the moving member 33. The first slide groove 131 determines the relative displacement and mutual positioning position of the outer shaft 1 and the moving member 33. The first fastening member 332 may be a screw, a pin, or the like that penetrates through a connection hole to fix the moving member 33 to the shaft core 2.

In one embodiment, the moving member 33 is provided with a second sliding slot 331, and the first surface 321 is switched between a state of being located in the second sliding slot 331 and a state of being pressed by the moving member 33. When the first surface 321 of the clamper 32 moves to a surface abutting the lower end of the moving member 33, the clamper 32 is located at the open position, and the first surface 321 of the clamper 32 moves to the upper end of the second runner 331, and at this time, the second surface 322 of the clamper 32 moves to a surface abutting the lower end of the moving member 33, and the clamper 32 is located at the clamping position. The first end of the clamping member 32 slides in the second sliding groove 331, which helps to reduce the friction between the clamping member 32 and the moving member 33, and improves the moving flexibility of the clamping member 32.

The second sliding grooves 331 are provided in plurality in the circumferential direction of the moving member 33, and the number of the second sliding grooves 331 is the same as that of the grippers 32. Four positioning portions 311 are provided on the link 31, four holding members 32 are provided on the link 31, and four second slide grooves 331 are provided.

In one embodiment, the clamping portion 323 of the clamping member 32 is provided with two protrusions, and the axial direction of the connecting shaft 71 is provided with two grooves 711 matched with the protrusions, so that the clamping member 32 and the connecting shaft 71 are clamped and fixed in two stages, and the clamping member 32 and the connecting shaft 71 can be accurately clamped and fixed in place without the problem of half-clamping.

In another aspect of the present invention, a hydraulic control rod driving system is provided, which includes a driving mechanism, a control rod, a buffer cylinder and a driving shaft as in the above embodiments, wherein the driving mechanism is disposed outside the slot section, the buffer cylinder is sleeved outside the buffer lock on the driving shaft, and the control rod is clamped, fixed or released and removed by a clamping member. The control rod hydraulic drive system comprises the drive shaft in the above embodiment, which has all the advantages of the above embodiment, and will not be described herein again.

The driving mechanism is arranged on the outer side of the clamping groove section and is fixedly grabbed with the groove body of the clamping groove section through a pin claw of the driving mechanism, and the stepping movement of the driving shaft is realized. The outside of drive shaft is located to the buffer cylinder cover to in the buffer lock was located the buffer cylinder, the drive shaft descends the in-process, and the speed limit is carried out and is braked through the damping resistance in the buffer cylinder to the buffer lock. The control rod is connected in the lower extreme of drive shaft, and the control rod can be dismantled with the drive shaft and be connected, satisfies reactor reloading state control rod and the demand that the drive shaft can long-range butt joint, long-range dismouting, provides technical support for reactor reloading operation.

Wherein, referring to fig. 17, the control rod may be a cross wing control rod.

The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.

Claims (10)

1. A drive shaft, comprising:

an outer shaft comprising a slot section;

the shaft core is arranged in the outer shaft and is suitable for moving along the axial direction of the outer shaft;

the connecting device comprises a connecting piece connected to the lower end of the outer shaft and a moving piece connected to the lower end of the shaft core, a plurality of clamping pieces are connected to the connecting piece, and the shaft core drives the moving piece to move along the outer shaft so as to drive the plurality of clamping pieces to be switched between a clamping position where the clamping pieces are mutually tightened and an opening position where the clamping pieces are mutually far away;

the shaft core with be equipped with the restoring piece between the outer axle, the one end of restoring piece with the shaft core is fixed mutually, the other end of restoring piece with the outer axle is fixed mutually, the restoring force of restoring piece is used for driving the moving member removes, so that the holder follow open position restores to the clamping position.

2. The drive spindle of claim 1, wherein a plurality of restoring members are disposed between the spindle core and the outer shaft, at least one of the restoring members being disposed proximate the coupling device and at least one of the restoring members being disposed proximate an upper end of the spindle core.

3. The drive shaft according to claim 1, wherein the shaft core comprises a shaft body and a mounting and dismounting sleeve fixed to an upper end of the shaft body, a groove is formed in the outer shaft, an expansion ring is arranged in the groove, and the outer shaft and the mounting and dismounting sleeve are locked through the expansion ring; install and remove the upper end of cover and be equipped with the constant head tank, the lower extreme of installing and removing the cover is equipped with spacing step, the lower extreme of expander is spacing in spacing step, install and remove the cover and be located the surface of expander upper end with be equipped with the circumferential weld between the internal surface of outer axle.

4. The driving shaft according to claim 1, wherein the outer shaft includes a limiting groove, a first optical axis section located at an upper end of the clamping groove section, and a second optical axis section located at a lower end of the clamping groove section, the clamping groove section includes a first pawl recognizing section and a second pawl recognizing section, the first pawl recognizing section includes a first groove body, the second pawl recognizing section includes a second groove body, and a length of the first groove body is greater than a length of the second groove body along an axial direction of the clamping groove section;

the limiting groove is located between the clamping groove section and the second optical axis section, and the length of the limiting groove in the axial direction of the clamping groove section is larger than or equal to twice the stepping length of the driving shaft.

5. The driving shaft according to claim 1, wherein a buffer lock is fixedly connected to the outer shaft, the buffer lock is located below the slot section, the buffer lock includes an upper lock body, a lower lock body, and a roller, the upper lock body is fixed to the lower lock body, the roller is disposed on an outer wall of the upper lock body and/or the lower lock body, and a gap is disposed between an inner wall of the lower lock body and an outer wall of the outer shaft.

6. The drive shaft of claim 2, wherein the outer shaft is divided into a plurality of sections of shaft members along the axial direction of the outer shaft, and the adjacent sections of shaft members are connected through threads and are limited circumferentially through fasteners;

the inner wall of the outer shaft is fixedly connected with a lock sleeve for axially limiting the restoring piece, and a gap is formed between the lock sleeve and the outer wall of the shaft core; the lock sleeve is fixed in through running through the round pin axle of outer axle the outer axle, and/or, the lock sleeve passes through the convex step of inner wall of outer axle carries out the axial spacing.

7. The drive shaft according to claim 2, wherein the shaft core comprises a first shaft section and a plurality of second shaft sections, two of the second shaft sections are connected by the first shaft section, an outer diameter of the first shaft section is smaller than an outer diameter of the second shaft section, and the second shaft section is sleeved with the restoring member;

and one end of the second shaft section is in threaded connection with a positioning block for axially limiting the restoring piece, and the positioning block and the second shaft section are limited circumferentially through a fastening piece.

8. The drive spindle of any of claims 1 to 7, wherein a first end of the clamping member defines a first surface and a second end of the clamping member defines a second surface, the first surface forming an angle with the second surface, the moving member pressing against the first surface in the clamped position and the moving member pressing against the second surface in the open position;

and/or the connecting piece comprises a plurality of positioning parts which are sleeved outside the connecting shaft of the control rod, and the end parts of the positioning parts are provided with guide surfaces for guiding the connecting shaft to be inserted into the connecting piece.

9. The drive shaft according to claim 8, wherein a protrusion is provided on an outer side of the positioning portion, and the moving member is retained by the protrusion in the clamping position;

and/or, the connecting piece is including being used for restricting the spacing portion of connecting axle axial position, spacing portion connect in location portion is inboard, the connecting axle butt in spacing portion.

10. A control rod hydraulic drive system, comprising: the driving shaft of any one of claims 1 to 9, the driving mechanism is arranged outside the clamping groove section, the buffer cylinder is sleeved outside a buffer lock on the driving shaft, and the control rod is clamped and fixed or loosened and detached through the clamping piece.

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