Drive shaft and control rod hydraulic drive system

Abstract

The present invention relates to the field of reactor engineering technology, and provides a drive shaft and a control rod hydraulic drive system. The drive shaft includes a slot section, a first optical axis section and a second optical axis section. The slot section includes a first claw section and a second claw section. The first claw section includes a first slot body, and the second claw section includes a second slot body. Along the axial direction of the slot section, the length of the first slot body is greater than the length of the second slot body; the first optical axis section is located at the first end of the slot section; the second optical axis section is located at the second end of the slot section. The drive shaft and control rod hydraulic drive system proposed by the present invention, the first slot body enables the pin claw of the drive mechanism to be accurately engaged with the drive shaft, solving the problem of the initial zero position deviation between the drive shaft and the pin claw, and the second slot body can ensure the structural strength of the drive shaft.

Description

Technical Field

[0001] The present invention relates to the field of reactor engineering technology, and in particular to a driving shaft and a control rod hydraulic driving system. Background Art

[0002] The nuclear reactor control rod hydraulic drive technology is a built-in control rod drive technology. Its drive mechanism is placed in the high temperature, high pressure and irradiation environment of the reactor pressure vessel. It uses three hydraulic cylinders for lifting, transferring and clamping to drive the transfer and clamping of two sets of control rod assemblies in sequence to achieve the step-up, step-down and rod-dropping functions of the control rod assemblies.

[0003] Based on the working principle of the built-in control rod drive mechanism, the structural characteristics of the rod position measuring rod and the control rod, the drive shaft structure needs to match the pin claw of the drive mechanism to achieve the stable driving function of the drive mechanism. The problem of the starting zero position deviation between the drive shaft and the pin claw needs to be solved. The problem of the drive shaft collision in the event of incorrect operation of the drive mechanism at the highest rod position also needs to be solved. The problem of how to meet the connection requirements with the control rod and the rod position measuring rod also needs to be solved. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a drive shaft, wherein the first groove body enables the pin claw of the drive mechanism to be accurately engaged with the drive shaft, thereby solving the problem of initial zero position deviation between the drive shaft and the pin claw, and the second groove body can ensure the structural strength of the drive shaft.

[0005] The present invention also provides a control rod hydraulic drive system.

[0006] A drive shaft according to an embodiment of the first aspect of the present invention comprises:

[0007] The slot section includes a first recognition claw section and a second recognition claw section, wherein the first recognition claw section includes a first slot body, and the second recognition claw section includes a second slot body, and along the axial direction of the slot section, the length of the first slot body is greater than the length of the second slot body;

[0008] A first optical axis segment, located at a first end of the slot segment;

[0009] The second optical axis segment is located at the second end of the slot segment.

[0010] According to one embodiment of the present invention, it also includes a limiting groove, which is located between the slot segment and the second optical axis segment, and the length of the limiting groove along the axial direction of the slot segment is greater than or equal to twice the step length of the drive shaft.

[0011] According to one embodiment of the present invention, the slot section includes a first groove and a second groove, two adjacent first grooves are connected by a first connecting section to limit the first groove body, and two adjacent second grooves are connected by a second connecting section to limit the second groove body; along the axial direction of the slot section, the sum of the lengths of the first groove and the first connecting section is set to a first length, and the sum of the lengths of the second groove and the second connecting section is set to a second length, and the first length is equal to the second length.

[0012] According to one embodiment of the present invention, along the axial direction of the slot segment, the length of the first connecting segment is greater than the length of the second connecting segment, and the length of the first groove is less than the length of the second groove.

[0013] According to one embodiment of the present invention, the first groove includes a first upper section, a first lower section and a third connecting section connecting the first upper section and the first lower section, and the second groove includes a second upper section, a second lower section and a fourth connecting section connecting the second upper section and the second lower section; along the axial direction of the slot section, the length of the third connecting section is smaller than the length of the fourth connecting section, and the lengths of the first upper section, the first lower section, the second upper section and the second lower section are the same.

[0014] According to an embodiment of the present invention, both the first groove body and the second groove body are configured as annular grooves.

[0015] According to one embodiment of the present invention, when the slot section includes a first groove and a second groove, the first groove includes a first upper section, a first lower section and a third connecting section connecting the first upper section and the first lower section, and the second groove includes a second upper section, a second lower section and a fourth connecting section connecting the second upper section and the second lower section, the surfaces of the first upper section, the first lower section, the second upper section and the second lower section are all set to conical inclined surfaces.

[0016] According to one embodiment of the present invention, the first recognition claw section includes a transmission recognition claw section corresponding to the transmission claw and a clamping recognition claw section corresponding to the clamping claw, and the two ends of the clamping recognition claw section are respectively provided with a short section and a long section of the second recognition claw section, and the short section is located between the transmission recognition claw section and the clamping recognition claw section.

[0017] According to one embodiment of the present invention, a first connecting hole is provided at the end of the first optical axis segment facing away from the slot segment, and a second connecting hole is provided at the end of the second optical axis segment facing away from the slot segment. At least one of the first connecting hole and the second connecting hole is set as a threaded hole, and a connecting groove for fixed connection with a buffer lock is provided on the first optical axis segment.

[0018] According to the control rod hydraulic drive system of the second aspect of the present invention, the control rod comprises a drive mechanism, a control rod, a rod position measuring rod and the drive shaft described in the above embodiment, the first optical axis segment is connected to the rod position measuring rod, the second optical axis segment is connected to the control rod, and the drive mechanism is provided on the periphery of the slot segment.

[0019] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0020] The drive shaft provided by the embodiment of the present invention includes a slot section, and the slot section includes a first claw section and a second claw section. The first slot body of the first claw section and the second slot body of the second claw section have different lengths along the axial direction of the slot section, and the length of the first slot body is greater than the length of the second slot body. The first claw section corresponds to the initial clamping area of ​​the pin claw, so that the pin claw of the drive mechanism can accurately clamp the drive shaft in the initial clamping area. Among them, the starting position of the initial clamping area is the position before the control rod is started, which solves the problem of the starting zero position deviation between the drive shaft and the pin claw, and improves the performance and reliability of the drive mechanism. It is suitable for engineering and productization, meets the engineering application of the control rod built-in hydraulic drive technology on advanced integrated small water reactors with a thermal power of less than 50MW, and ensures the engineering application of the control rod built-in hydraulic drive technology.

[0021] Furthermore, an embodiment of the present invention also provides a control rod hydraulic drive system, including a drive mechanism, a control rod, a rod position measuring rod and the drive shaft in the above embodiment. Under the driving force of the drive mechanism, the drive shaft is driven to move up and down, and the lifting of the drive shaft drives the control rod and the rod position measuring rod to move up and down. The lifting of the control rod can adjust the power of the reactor, and the lifting of the rod position measuring rod can be used to measure the height position of the control rod.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a schematic structural diagram of a drive shaft provided by an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the local enlarged structure of the A part;

[0026] Figure 3 yes Figure 1 A schematic diagram of the partially enlarged structure of the B part;

[0027] Figure 4 yes Figure 1 A schematic diagram of the partially enlarged structure of the middle C part;

[0028] Figure 5 yes Figure 1 A schematic diagram of the partial enlarged structure of the D part in the middle;

[0029] Figure 6 It is a structural schematic diagram of the connection state between the driving shaft and the rod position measuring rod provided by an embodiment of the present invention;

[0030] Figure 7 is a structural schematic diagram of a connection state between a drive shaft and a control rod provided by an embodiment of the present invention;

[0031] Figure 8 is a structural schematic diagram of the relative position relationship between the drive shaft and the drive mechanism provided by an embodiment of the present invention;

[0032] Fig. 9 It is a schematic cross-sectional structural diagram of a driving mechanism applicable to the driving shaft of an embodiment of the present invention.

[0033] Reference numerals:

[0034] 1: slot section; 11: first recognition claw section; 111: transmission recognition claw section; 112: clamping recognition claw section; 113: first slot body; 114: first groove pattern; 1141: first upper section; 1142: third connecting section; 1143: first lower section; 115: first connecting section; 12: second recognition claw section; 121: short section; 122: long section; 123: second slot body; 124: second groove pattern; 1241: second upper section; 1242: fourth connecting section; 1243: second lower section; 125: second connecting section; 13: limit slot;

[0035] 2: first optical axis segment; 21: first connecting hole; 22: connecting groove;

[0036] 3: second optical axis segment; 31: second connecting hole;

[0037] 4: first welding position; 5: second welding position; 6: rod position measuring rod; 7: control rod;

[0038] 8: driving mechanism; 81: lifting cylinder; 82: transfer cylinder; 83: clamping cylinder; 84: transfer claw; 85: clamping claw;

[0039] a: first length; b: second length. DETAILED DESCRIPTION

[0040] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0041] In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0043] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] The first aspect of the present invention is combined with Figures 1 to 9 As shown, a driving shaft is provided, comprising: a slot segment 1, a first optical axis segment 2 and a second optical axis segment 3, wherein the first optical axis segment 2 is located at a first end of the slot segment 1, and the second optical axis segment 3 is located at a second end of the slot segment 1, that is, the slot segment 1 is located between the first optical axis segment 2 and the second optical axis segment 3. The slot segment 1 comprises a first recognition claw segment 11 and a second recognition claw segment 12, wherein the first recognition claw segment 11 comprises a first slot body 113, and the second recognition claw segment 12 comprises a second slot body 123, and along the axial direction of the slot segment 1, the length of the first slot body 113 is greater than the length of the second slot body 123.

[0046] The slot section 1 includes a plurality of slot bodies, which are used to provide a space for engaging with the pin claws of the driving mechanism 8, so that the pin claws of the driving mechanism 8 can firmly grasp and fix the driving shaft, and drive the driving shaft to be raised and lowered through the driving mechanism 8. Figure 8 and Fig. 9 As shown, the pin claw of the driving mechanism 8 includes a transfer claw 84 and a clamping claw 85. The transfer cylinder 82 of the driving mechanism 8 controls the switching between the first gripping position and the first unlocking position of the transfer claw 84. The clamping cylinder 83 of the driving mechanism 8 controls the switching between the second gripping position and the second unlocking position of the clamping claw 85.

[0047] The movement principle of the rising process of the drive shaft is the same as that of the falling process. The following is an example of the driving mechanism 8 driving the driving shaft to rise. When the transmission claw 84 is in the first gripping position (at this time, the clamping claw 85 is in the second unlocking position) with the groove body (the first groove body 113 or the second groove body 123) of the driving shaft, under the lifting power of the lifting cylinder 81 of the driving mechanism 8, the transmission cylinder 82 and the transmission claw 84 drive the driving shaft to rise upward, and the driving shaft completes one rise. Then, the clamping claw 85 grips the groove body corresponding to the clamping claw 85 (that is, the clamping claw 85 is in the second gripping position, and the groove body is the first groove body 113 or the second groove body 123) to achieve the fixing of the driving mechanism 8 and the driving shaft, the lifting cylinder 81 and the transmission cylinder 82 return to the initial position, the transmission claw 84 switches to the first unlocking position, and the transmission claw 84 switches to the first gripping position again under the drive of the transmission cylinder 82. Repeat the above process, and the next rising movement can be performed.

[0048] The movement process of the drive shaft is a stepping movement, and each rising distance is a step length, that is, between one rising movement and the next rising movement of the drive shaft, the clamping claw 85 clamps to the next slot body adjacent to the previous slot body. It should be noted that the structure, shape and size of the transmission claw 84 and the clamping claw 85 are generally the same, so that the slot bodies at different axial positions of the drive shaft can simultaneously meet the clamping requirements of the transmission claw 84 and the clamping claw 85.

[0049] In the drive shaft of this embodiment, the slot section 1 includes a first recognition claw section 11 and a second recognition claw section 12, and the slot body includes a first slot body 113 of the first recognition claw section 11 and a second slot body 123 of the second recognition claw section 12. Along the axial direction of the slot section 1, the length of the first slot body 113 is greater than that of the second slot body 123. The first slot body 113 can be understood as a wide slot, and the second slot body 123 can be understood as a narrow slot, wherein the width and narrowness refer to the different lengths along the axial direction of the slot section 1. Relative to the second slot body 123, the first slot body 113 can provide sufficient clamping margin for the transmission claw 84 and the clamping claw 85. Even if the transmission claw 84 or the clamping claw 85 cannot accurately correspond to the first slot body 113, the first slot body 113 can also provide sufficient space to ensure that the transmission claw 84 and the clamping claw 85 can accurately enter the first slot body 113 and clamp the drive shaft, so as to ensure the stable clamping of the drive mechanism 8 and the drive shaft. The space of the second slot 123 can also provide the required clamping space for the transmission claw 84 and the clamping claw 85, meeting the clamping requirements of the transmission claw 84 and the clamping claw 85. The space of the second slot 123 is slightly smaller than that of the first slot 113. Among them, the first recognition claw section 11 corresponds to the initial clamping area of ​​the transmission claw 84 and the clamping claw 85. The initial clamping area can be understood as the area position before the upward movement. The initial clamping area corresponds to the lower position of the drive shaft (the area that gradually rises from the lowest position by several step lengths). Figure 1 As shown, the first recognition claw section 11 is distributed at an upper position of the slot section 1. The first recognition claw section 11 can be distributed in multiple sections at intervals in the axial direction of the slot section 1.

[0050] The drive shaft of this embodiment is provided with a first claw section 11 and a second claw section 12, so that the transmission claw 84 and the clamping claw 85 of the drive mechanism 8 can stably grasp the drive shaft, thereby solving the problem of the starting zero position deviation between the drive shaft and the pin claw and improving the performance and reliability of the drive mechanism 8.

[0051] refer to Figure 1 , Figure 6 and Figure 7 As shown, the first optical axis section 2 is located above the slot section 1, and the upper end of the first optical axis section 2 is used to connect the rod position measuring rod 6, and the second optical axis section 3 is located below the slot section 1, and the lower end of the second optical axis section 3 is used to connect the control rod 7. Through the structural design of the slot section 1, the driving shaft can be stably raised and lowered, ensuring the smooth movement of the control rod 7 and accurate rod position indication.

[0052] In one embodiment, reference Figure 1 and Figure 3 As shown, the drive shaft also includes a limit groove 13, which is located between the slot segment 1 and the second optical axis segment 3. The axial length of the limit groove 13 along the slot segment 1 is greater than or equal to twice the step length of the drive shaft to solve the problem of the drive shaft falling and colliding with the vehicle due to misoperation or other factors when the drive shaft is at the highest rod position.

[0053] refer to Figure 1 , Figure 8 and Fig. 9 As shown, the transfer claw 84 is located above the clamping claw 85. When the drive shaft rises to the highest position, that is, the clamping claw 85 is located at the lowest position of the slot section 1, the clamping claw 85 is clamped on the last groove of the slot section 1 (that is, the clamping claw 85 extends into the limit groove 13). At this time, if the lifting cylinder 81 and the transfer cylinder 82 lift the drive shaft again, after the drive shaft rises again, the clamping claw 85 needs to extend into the limit groove 13 again for clamping. At this time, since the length of the limit groove 13 is greater than or equal to the length of two steps of the drive shaft, the clamping claw 85 can extend into the limit groove 13 again. Under the action of gravity, the drive shaft drops downward by a step length so that the clamping claw 85 clamps the last groove again, thereby avoiding the drive shaft falling and causing a collision accident.

[0054] It should be noted that if the clamping claw 85 is located above the transmission claw 84, when the drive shaft is raised to the highest position, the transmission claw 84 is located at the lowest position of the slot section 1. By setting the limit groove 13, the principle of the transmission claw 84 fixing the drive shaft is the same as that of the clamping claw 85, which will not be repeated here. The upper and lower positions of the clamping claw and the transmission claw are not limited in this embodiment.

[0055] In one embodiment, reference Figure 1 and Figure 2 As shown, the slot segment 1 includes a first groove 114 and a second groove 124, two adjacent first grooves 114 are connected by a first connecting segment 115 to limit the first groove body 113, and two adjacent second grooves 124 are connected by a second connecting segment 125 to limit the second groove body 123; along the axial direction of the slot segment 1, the length of the first groove 114 and the first connecting segment 115 is set to a first length a, and the length of the second groove 124 and the second connecting segment 125 is set to a second length b, and the first length a is equal to the second length b.

[0056] The first length a and the second length b can be understood as a step length. The step lengths of the first recognition claw section 11 and the second recognition claw section 12 are the same, ensuring that the step lengths of the drive shaft are the same, so that the transmission claw 84 and the clamping claw 85 can accurately enter the slot body to avoid the problem of misalignment between the claw and the slot.

[0057] In one embodiment, along the axial direction of the slot segment 1, the length of the first connecting segment 115 is greater than the length of the second connecting segment 125, so that the length of the first slot body 113 is greater than the length of the second slot body 123; along the axial direction of the slot segment 1, the length of the first groove 114 is less than the length of the second groove 124, so as to ensure that the first length a is the same as the second length b, that is, the step length is the same.

[0058] When the first groove body 113 and the second groove body 123 are annular grooves in the following embodiments, the first connecting section 115 and the second connecting section 125 are cylindrical structures, the first groove 114 can be understood as a narrow ring, and the second groove 124 can be understood as a wide ring, that is, the groove body and groove corresponding to the first claw section 11 are wide groove narrow rings, and the groove body and groove corresponding to the second claw section 12 are narrow groove wide rings, so as to ensure that the first length a and the second length b are equal in length, thereby ensuring accurate stepping of the drive shaft. Among them, the structural strength of the narrow groove wide ring is better than that of the wide groove narrow ring, refer to Figure 1 As shown, the number of narrow groove wide rings is greater than that of wide groove narrow rings, which helps to improve the structural strength of the drive shaft while ensuring accurate clamping of the transmission claw 84 and the clamping claw 85.

[0059] In one embodiment, reference Figure 1 and Figure 2 As shown, the first groove 114 includes a first upper section 1141, a first lower section 1143 and a third connecting section 1142 connecting the first upper section 1141 and the first lower section 1143, and the second groove 124 includes a second upper section 1241, a second lower section 1243 and a fourth connecting section 1242 connecting the second upper section 1241 and the second lower section 1243; along the axial direction of the slot section 1, the length of the third connecting section 1142 is less than the length of the fourth connecting section 1242, and the lengths of the first upper section 1141, the first lower section 1143, the second upper section 1241 and the second lower section 1243 are the same. The length difference between the first groove 114 and the second groove 124 is achieved by the length difference between the third connecting section 1142 and the fourth connecting section 1242, which helps to simplify the structure of the first groove 114 and the second groove 124, and makes the first groove 114 and the second groove 124 more convenient to process.

[0060] Wherein, when the groove body is an annular groove, the third connecting section 1142 and the fourth connecting section 1242 are cylindrical, and have the same radial dimensions, and the difference lies in the different lengths along the axial direction of the drive shaft. The first upper section 1141 and the second upper section 1241 also have the same shape, and the first lower section 1143 and the second lower section 1243 also have the same shape. The surface of the first upper section 1141 is an inclined surface that is inclined upward along the third connecting section 1142 and inclined toward the center line direction of the drive shaft, and the surface of the second upper section 1241 is an inclined surface that is inclined upward along the fourth connecting section 1242 and inclined toward the center direction of the drive shaft; the surface of the first lower section 1143 is an inclined surface that is inclined downward along the third connecting section 1142 and inclined toward the center direction of the drive shaft, and the surface of the second lower section 1243 is an inclined surface that is inclined downward along the fourth connecting section 1242 and inclined toward the center direction of the drive shaft.

[0061] Among them, along the axial direction of the slot section 1, the length of the first connecting section 115 is the same as the length of the fourth connecting section 1242, and the length of the second connecting section 125 is the same as the length of the third connecting section 1142. The length difference between the first connecting section 115 and the second connecting section 125 can be selected as needed. Figure 1 and Figure 2 As shown, the length of the second connecting section 125 is two thirds of the length of the first connecting section 115 .

[0062] In one embodiment, reference Figures 1 to 3 As shown, the first groove body 113 and the second groove body 123 are both configured as annular grooves, which are convenient to process and have flexible circumferential spaces, thereby effectively solving the circumferential deviation of the transmission claw 84 or the clamping claw 85 .

[0063] A plurality of transmission claws 84 are arranged in the circumferential direction of the driving mechanism 8, and the first groove body 113 and the second groove body 123 are set as annular grooves, and a plurality of transmission claws 84 can simultaneously extend into a first groove body 113 or a second groove body 123. Similarly, a plurality of clamping claws 85 are also arranged in the circumferential direction of the driving mechanism 8, and a plurality of clamping claws 85 can simultaneously extend into a first groove body 113 or a second groove body 123.

[0064] Of course, when multiple transmission claws 84 are arranged in the circumference of the driving mechanism 8, the first groove body 113 and the second groove body 123 are not limited to annular grooves. The shapes of the first groove body 113 and the second groove body 123 can also be the same as the shape of the clamping end of the transmission claw 84. The first groove body 113 and the second groove body 123 are arranged in the circumference of the driving shaft to meet the clamping requirements of each transmission claw 84.

[0065] In one embodiment, when the first groove body 113 and the second groove body 123 are both configured as annular grooves, the surfaces of the first upper section 1141, the first lower section 1143, the second upper section 1241, and the second lower section 1243 are all configured as conical inclined surfaces, and the conical inclined surfaces are convenient for processing. The first upper section 1141 and the second upper section 1241 are both positive conical inclined surfaces, the first lower section 1143 and the second lower section 1243 are both inverted conical inclined surfaces, and the first upper section 1141, the first lower section 1143, the second upper section 1241, and the second lower section 1243 have the same taper, which is convenient for processing.

[0066] In one embodiment, reference Figure 1As shown, the first recognition claw section 11 includes a transmission recognition claw section 111 corresponding to the transmission claw 84 and a clamping recognition claw section 112 corresponding to the clamping claw 85. The two ends of the clamping recognition claw section 112 are respectively provided with a short section 121 and a long section 122 of the second recognition claw section 12, and the short section 121 is located between the transmission recognition claw section 111 and the clamping recognition claw section 112. When the drive shaft is at a lower position, the transmission recognition claw section 111 corresponds to the position of the transmission claw 84, and the clamping recognition claw section 112 corresponds to the position of the clamping claw 85, so as to ensure that the transmission claw 84 and the clamping claw 85 can be accurately engaged in the card slot section 1 in the initial stage. Along the axial direction of the drive shaft, there is a spacing between the transmission claw 84 and the clamping claw 85, that is, there is a spacing between the transmission recognition claw section 111 and the clamping recognition claw section 112, and the second recognition claw section 12 is provided between the transmission recognition claw section 111 and the clamping recognition claw section 112.

[0067] The length of the second recognition claw section 12 between the transmission recognition claw section 111 and the clamping recognition claw section 112 can be set as required, refer to Figure 1 As shown, the distance between the transmission recognition claw section 111 and the clamping recognition claw section 112 is not large, the second recognition claw section 12 between the transmission recognition claw section 111 and the clamping recognition claw section 112 is shorter, which can be called the short section 121, and the second recognition claw section 12 between the clamping recognition claw section 112 and the limiting groove 13 is longer, which can be called the long section 122.

[0068] In one embodiment, reference Figure 1 , Figures 4 to 7 As shown, a first connecting hole 21 is provided at the end of the first optical axis segment 2 facing away from the slot segment 1, and a second connecting hole 31 is provided at the end of the second optical axis segment 3 facing away from the slot segment 1. At least one of the first connecting hole 21 and the second connecting hole 31 is set as a threaded hole, and a connecting groove 22 for fixed connection with the buffer lock is provided on the first optical axis segment 2.

[0069] The top of the driving shaft is provided with a first connection hole 21, and the rod position measuring rod 6 is inserted into the first connection hole 21 and threadedly fixed to the first connection hole 21. After the driving shaft and the rod position measuring rod 6 are threadedly fixed, spot welding is performed at the first welding position 4 on the top of the driving shaft to strengthen the fixation, so as to prevent loosening and ensure the fixation stability of the rod position measuring rod 6 and the driving shaft.

[0070] The bottom of the drive shaft is provided with a second connection hole 31, and the control rod 7 is inserted into the second connection hole 31 and fixed by threads. After the drive shaft and the control rod 7 are fixed by threads, the drive shaft and the control rod 7 are fixed by welding at the second welding position 5 at the bottom of the drive shaft to ensure the fixing stability of the drive shaft and the control rod 7. Figure 7 As shown, the control rod 7 can be a cross-wing control rod.

[0071] The drive shaft is connected with a buffer lock, which serves to connect the drive shaft with the spring box. The buffer lock is provided with a retractable and adjustable lock element, which is connected to the lock body of the buffer lock through an elastic element (such as a spring). The elastic element is compressed to allow the lock element to return to the lock body, thereby releasing the locking relationship between the lock element and the connecting groove 22, thereby releasing the connection between the buffer lock and the drive shaft; the elastic element is restored to allow the lock element to extend and be engaged in the connecting groove 22, thereby fixing the buffer lock and the drive shaft. Figure 8 As shown, the connection groove 22 is an annular groove, so that multiple positions of the drive shaft in the circumferential direction can be adapted to the lock body of the buffer lock, making the connection between the buffer lock and the drive shaft easier. Of course, the connection groove can also be a plurality of slots evenly distributed in the circumferential direction of the first optical axis segment, and the position of the connection groove corresponds to the position of the lock body one by one.

[0072] The driving shaft in the above embodiment may be a solid shaft to ensure the structural strength of the driving shaft.

[0073] The drive shaft of the above embodiment is applied to the control rod drive system, which solves the problem of the initial zero position deviation between the drive shaft and the pin claw, and also solves the problem of the drive shaft crashing when the drive mechanism is misoperated at the highest rod position, and has the characteristics of simple structure and convenient operation. The drive shaft of the above embodiment is suitable for engineering and productization, and ensures the engineering application of the control rod built-in hydraulic drive technology, which not only meets the engineering application of the control rod built-in hydraulic drive technology in advanced integrated small water reactors with thermal power less than 50MW.

[0074] The embodiment of the second aspect of the present invention, in combination with Figures 6 to 8 As shown, a control rod hydraulic drive system is provided, comprising a drive mechanism 8, a control rod 7, a rod position measuring rod 6 and the drive shaft in the above embodiment, the first optical axis section 2 is connected to the rod position measuring rod 6, the second optical axis section 3 is connected to the control rod 7, and the outer periphery of the slot section 1 is provided with a drive mechanism 8. The control rod hydraulic drive system comprises the drive shaft in the above embodiment, and has all the beneficial effects of the above embodiment, which will not be described in detail here.

[0075] The two ends of the driving shaft are respectively connected to the control rod 7 and the rod position measuring rod 6. The outer periphery of the slot section 1 is provided with a driving mechanism 8. Under the driving force of the driving mechanism 8, the driving shaft is driven to move up and down. The lifting of the driving shaft drives the control rod 7 and the rod position measuring rod 6 to move up and down. The lifting of the control rod 7 can adjust the power of the reactor. The lifting of the rod position measuring rod 6 can be used to measure the height position of the control rod 7, so as to ensure accurate monitoring of the position of the control rod 7.

[0076] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A drive shaft, characterized in that: include: The slot section includes a first recognition claw section and a second recognition claw section, wherein the first recognition claw section includes a first slot body, and the second recognition claw section includes a second slot body, and along the axial direction of the slot section, the length of the first slot body is greater than the length of the second slot body; A first optical axis segment, located at a first end of the slot segment; A second optical axis segment, located at a second end of the slot segment; The slot section includes a first groove and a second groove, two adjacent first grooves are connected by a first connecting section to limit the first groove body, and two adjacent second grooves are connected by a second connecting section to limit the second groove body; along the axial direction of the slot section, the sum of the lengths of the first groove and the first connecting section is set to a first length, and the sum of the lengths of the second groove and the second connecting section is set to a second length, and the first length is equal to the second length; It also includes a limiting groove, the limiting groove is located between the clamping groove section and the second optical axis section, and the length of the limiting groove along the axial direction of the clamping groove section is greater than or equal to twice the step length of the driving shaft; Along the axial direction of the slot segment, the length of the first connecting segment is greater than the length of the second connecting segment, and the length of the first groove is less than the length of the second groove.

2. The drive shaft according to claim 1, characterized in that: The first groove includes a first upper section, a first lower section and a third connecting section connecting the first upper section and the first lower section, and the second groove includes a second upper section, a second lower section and a fourth connecting section connecting the second upper section and the second lower section; along the axial direction of the slot section, the length of the third connecting section is smaller than the length of the fourth connecting section, and the lengths of the first upper section, the first lower section, the second upper section and the second lower section are the same.

3. The drive shaft according to claim 1 or 2, characterized in that: The first groove body and the second groove body are both configured as annular grooves.

4. The drive shaft according to claim 3, characterized in that: When the slot section includes a first groove and a second groove, the first groove includes a first upper section, a first lower section and a third connecting section connecting the first upper section and the first lower section, the second groove includes a second upper section, a second lower section and a fourth connecting section connecting the second upper section and the second lower section, and the surfaces of the first upper section, the first lower section, the second upper section and the second lower section are all set to conical inclined surfaces.

5. The drive shaft according to claim 1 or 2, characterized in that: The first recognition claw section includes a transmission recognition claw section corresponding to the transmission claw and a clamping recognition claw section corresponding to the clamping claw. The two ends of the clamping recognition claw section are respectively provided with a short section of the second recognition claw section and a long section of the second recognition claw section. The short section is located between the transmission recognition claw section and the clamping recognition claw section.

6. The drive shaft according to claim 1 or 2, characterized in that: A first connecting hole is provided at the end of the first optical axis segment facing away from the slot segment, and a second connecting hole is provided at the end of the second optical axis segment facing away from the slot segment. At least one of the first connecting hole and the second connecting hole is set as a threaded hole, and a connecting groove for fixed connection with a buffer lock is provided on the first optical axis segment.

7. A control rod hydraulic drive system, characterized in that: It comprises a driving mechanism, a control rod, a rod position measuring rod and a driving shaft as claimed in any one of claims 1 to 6, wherein the first optical axis segment is connected to the rod position measuring rod, the second optical axis segment is connected to the control rod, and the driving mechanism is arranged on the periphery of the slot segment.

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