A reel energy absorbing component

Abstract

The present invention discloses a drum energy absorption assembly comprising a first fixed seat, a second spring with one end acting on the first fixed seat, and a retaining ring disposed at the other end of the second spring. A second bearing is disposed between the retaining ring and the second spring. The second bearing is a thrust bearing that enables the retaining ring to rotate relative to the second spring. The second spring, second bearing, and retaining ring are shaped and sized so that they can be coaxially arranged. When used in a control rod drive mechanism (CRDM), the energy absorption assembly provided by this solution can ensure the reliability of the CRDM's performance.

Description

Technical Field

[0001] The present invention relates to the technical field of control rod drive mechanisms, and in particular to a reel energy absorbing assembly. Background Art

[0002] The control rod drive mechanism (CRDM) is used to drive the control rod assembly up and down within the reactor core, thereby enabling important functions such as reactor startup, power regulation, and safe shutdown. Conventional control rod drive mechanisms typically utilize claw drive, drag chain (chain) drive, and wire rope drive. In the wire rope drive method, a drive motor typically drives a drum to rotate around a lead screw. The lead screw moves along its axis as it rotates. A wire rope is wound around the drum, raising or lowering the control rod assembly as the drum rotates.

[0003] Patent application number CN202111412631.0, titled "A Control Rod Drive for an Open Reactor," provides a control rod drive device that includes an electromagnetic clutch. This device utilizes the deadweight of the control rod assembly. When the electromagnetic clutch is de-energized, the control rods can fall under their own gravity, enabling rapid rod drop after a power outage and ensuring reactor safety. This technical solution also connects the control rods to the drum via a steel cable.

[0004] According to the characteristics of control rod drop in nuclear reactors, a technical solution is provided to improve the working reliability of the control rod drive mechanism, which is of great significance to the development of my country's nuclear power technology. Summary of the Invention

[0005] To address the aforementioned technical problem of providing a solution that improves the reliability of control rod drive mechanisms (CRDMs), a technical issue of great significance to the development of nuclear power technology in my country, the present invention provides a drum energy absorption assembly. When used in a CRDM, the energy absorption assembly provided by this solution can ensure the reliability of the CRDM's performance.

[0006] In response to the above problems, the present invention provides a reel energy absorbing assembly that solves the problem through the following technical points: a reel energy absorbing assembly includes a first fixing seat, a second spring with one end acting on the first fixing seat, and a retaining ring arranged at the other end of the second spring, a second bearing being provided between the retaining ring and the second spring, and the second bearing being a thrust bearing that enables the retaining ring to rotate relative to the second spring;

[0007] The shapes and sizes of the second spring, the second bearing and the retaining ring satisfy the requirement that the three can be coaxially arranged.

[0008] In the prior art, methods for achieving emergency shutdown of a nuclear reactor include adopting an emergency drop of control rods. Taking the technical solution provided by application number CN202111412631.0 as an example, when the electromagnetic clutch is disconnected, the control rod falls under the action of its own gravity. Since the upper end of the control rod is connected to a wire rope, the wire rope is partially wound on the drum. The drum will rotate under the traction of the wire rope during the falling process of the control rod. The speed of rotation of the drum is related to the falling speed of the control rod. During the process of dropping the control rod without obstruction under its own weight and specific falling height, the drum may be accelerated to a speed far greater than that under the action of the drive mechanism (generally a drive motor). After the control rod interacts with the buffer mechanism in the pressure vessel, the drum will further rotate under its own inertia. At this time, the wire rope released from the drum will change from a straight state to a relaxed state. Since the driving motor generally drives the drum to rotate through a reducer, the driving mechanism generally has multiple sets of gear sets for realizing reduction transmission. At the same time, in order to further accurately release the position of the wire rope at a fixed point, a guide wheel set is generally configured to constrain the position of the wire rope in space. Therefore, after the control rod is dropped, the drum continues to rotate and further releases the wire rope. A section of slack wire rope will be formed between the wire rope release position on the drum and the guide wheel set. The shape and position of this section of wire rope are uncontrollable. When the wire rope is hooked with other parts on the control rod drive mechanism or enters the meshing position of the gear set, the wire rope will not be able to be reeled onto the drum later and may even be damaged or cut by the meshing gears, affecting the reliability of the drum assembly and the control rod drive mechanism.

[0009] This solution provides an energy absorbing component based on the characteristic that the drum will continue to move along the axis of the screw during its continued rotation, which is determined by the matching characteristics of the screw and the drum. The specific working principle is: the energy absorbing component is installed in front of the movement direction of the drum when the drum releases the wire rope, and at the same time, the retaining ring faces the end face of the drum. In this way, when the drum rotates in the direction of rotation of the released wire rope and further moves along the axis of the screw, since the energy absorbing component is arranged in front of the movement direction of the drum, when the drum contacts and squeezes the retaining ring, the thrust is transmitted through the second bearing to compress the second spring. As the drum further moves along the axis of the screw, the second spring is further squeezed until the drum is forced to stop rotating and translate along its own axis under the action of the energy absorbing component. Compared to placing a rigid constraint on the end of the drum, this energy-absorbing assembly effectively prevents damage to the drum's end surface, the threaded connection between the drum and the lead screw due to impact. Compared to rotating the drum unconstrained by inertia, this energy-absorbing assembly converts the drum's kinetic energy into the elastic potential energy of the second spring. This not only shortens the length of the wire rope released from the drum after the control rod is dropped, but also reduces the likelihood of the wire rope getting caught or entering the gear shaft meshing area by reducing the length of the slack section. Furthermore, since the corresponding lead screw is typically a ball screw, the drum can reversely rotate under the reverse push of the second spring to rewind some or all of the slack section of the wire rope after the drum's speed reaches zero, thereby improving the reliability of the drum assembly and the control rod drive mechanism. The second bearing allows the drum to rotate relative to the second spring, preventing wear on components of the assembly and the drum due to sliding friction caused by torque, thereby extending the service life of the control rod drive mechanism.

[0010] The above setting of the three being coaxial is intended to utilize the three being installed coaxially with the screw to prevent the reel from being subjected to excessive wear on one side of the thread pair between the reel and the screw due to the force from the retaining ring deviating from the screw axis.

[0011] As a further technical solution of the reel energy absorbing assembly:

[0012] In the prior art, the lead screw is generally mounted on the drum assembly in a manner of being supported at both ends, and the drum is positioned on the lead screw axis between the two ends of the lead screw. As a means of using the lead screw as a mounting seat for the energy absorbing assembly to simplify the structure of the control rod drive mechanism and facilitate assembly of the energy absorbing assembly, the arrangement is as follows: a center hole is provided on each of the three, and when the three are coaxially arranged, the center holes of the three are coaxial. In this solution, the center holes on the three are all used for the screw to pass through. Since each of them is assembled at a different axial position of the screw, by controlling the aperture of the center hole and / or the outer diameter of the corresponding shaft segment of the screw, etc., it can be specifically assembled as the first fixed seat is fixed on the screw, the inner diameter of the center hole on the second spring is larger than the outer diameter of the inner screw shaft segment, the thrust washer of the second bearing close to the second spring is fixed relative to the end of the second spring away from the first fixed seat, the inner diameter of the thrust washer of the second bearing close to the retaining ring is larger than the outer diameter of the inner screw shaft segment, the thrust washer of the second bearing close to the retaining ring is embedded and fixed in the retaining ring to achieve position positioning in the radial direction of the screw, and the retaining ring can be rotatably and slidably sleeved on the outside of the screw.

[0013] As a technical solution with simple structure, small volume and convenient assembly, it is set as follows: the first fixing seat is a cylindrical structure with an open end and an end plate at the other end, and the second spring acts on the inner side of the end plate;

[0014] The end plate is provided with a center hole, and the three and the first fixing seat can be assembled such that: the center hole on the end plate is coaxial with the center holes of the three;

[0015] The end plate is also provided with an internally threaded hole extending from the outer side of the end plate to the wall of the center hole on the end plate. A second set screw is threadedly connected to the internally threaded hole. This solution provides a specific structural form that facilitates the fixation of the first fixing seat to the lead screw. By rotating the second set screw, the first fixing seat is fixed to the lead screw by the force between the end face of the second set screw and the outer surface of the lead screw. The cylindrical housing of the first fixing seat outside the second spring not only protects the second spring but also serves as a carrier for the annular groove described below. The above four center holes are used to coaxially mount the energy absorbing assembly on the lead screw.

[0016] As a technical solution for utilizing the position of a retaining ring in the radial direction of the lead screw to constrain the position of a second bearing in the radial direction of the lead screw, it is configured as follows: the center hole on the retaining ring is a stepped hole, and the thrust washer at one end of the second bearing close to the retaining ring is fixed in the stepped hole. In specific implementation, it is preferably configured that the stepped hole on the retaining ring has two stepped surfaces, and the two stepped surfaces make the stepped hole have three hole sections, wherein the inner diameters of the hole sections at both ends are larger than the inner diameter of the hole section in the space, and the lead screw is configured as a stepped shaft. In this way, the hole section close to the second bearing is used to position the corresponding thrust washer in the axial direction of the retaining ring and in the radial direction, and the stepped surface of the hole section at the other end is used to cooperate with the stepped surface on the lead screw. The energy absorbing component is limited to a specific axial position on the lead screw axis by using a first fixed seat fixed on the lead screw axis.

[0017] This is a small-volume, force-transmitting technical solution that prevents deformation of the second spring from causing displacement of the compressed position, ultimately leading to a sudden change in the elastic force of the second spring during deformation and causing impact on the winding drum. The solution is configured as follows: the second spring is composed of multiple stacked disc springs, with a spacer disposed between any two adjacent disc springs; the outer diameter of the spacer is greater than or equal to the outer diameter of the disc spring, and adjacent disc springs transmit force through the spacer. In a specific implementation of this solution, for an assembly method in which the second spring is sleeved on a lead screw, the spacer is configured as an annular structure, and the inner diameter of the center hole in the spacer is greater than the outer diameter of the lead screw shaft segment located inside the spacer.

[0018] Different from the conventional field, the installation space provided for various components in the nuclear reactor structure design is limited. At the same time, the second spring generally operates in an environment above room temperature. In order to control the compression of the second spring to avoid the load size it bears in a single operation and thus prolong the service life of the second spring, it is configured to: further include a control device for controlling the elastic compression amount of the second spring, wherein the elastic compression amount is the elastic compression amount of the second spring in the direction of its axis;

[0019] The control device includes a second mounting base and a resistance member. The resistance member provides resistance to the movement of the second mounting base relative to the first mounting base along its axis by being subjected to shear or compression. Those skilled in the art will appreciate that the above control device can achieve its purpose by bearing part or, at a certain moment, all of the thrust from the reel during the elastic deformation of the second spring under the action of the reel. Those skilled in the art may employ various forms of the control device without inventive effort.

[0020] As a specific implementation form, it is configured as follows: the first fixing seat is a cylindrical structure with one end open, and the second spring is partially or entirely located in the inner hole of the first fixing seat;

[0021] An annular groove extending along the circumferential direction of the first fixing seat is also provided on the outer side surface of the first fixing seat;

[0022] The inner wall of the second fixing seat is located outside the outer wall of the first fixing seat, and the second fixing seat is further provided with a channel having an opening on the inner wall. The control device also includes a steel ball embedded in the channel, and the channel is further provided with a first spring for applying a thrust to the steel ball so that the surface of the steel ball contacts the outer wall.

[0023] The dimensions of the channel, steel ball, and annular groove are such that, as the second fixing seat moves along the axis of the first fixing seat in the direction of compressing the second spring, the steel ball can be squeezed into the annular groove under the action of the first spring. At this time, the steel ball acts as a component that withstands shear stress between the first and second fixing seats. This solution, based on the cylindrical structure of the first fixing seat, is configured as a control device that includes the second fixing seat, the channel, the steel ball, the first spring, and other components. This is a technical solution that is easy to assemble, compact, and does not subject the control device itself to excessive stress. Specifically, when in use, the second fixing seat is mounted at the end of the reel and located outside the first fixing seat. As the second fixing seat rotates with the reel and translates along the axis of the screw, the steel ball rotates relative to the axis of the screw and translates along the axis of the screw. When the steel ball is pushed into the annular groove under the action of the first spring, it is sheared during further movement of the reel. In this way, the thrust applied by the steel ball to the second fixing seat prevents the second fixing seat from moving further. This solution can not only use the action of the steel ball on the second fixed seat to provide resistance for the reel to move further along the screw, but also be set in the form of the first fixed seat to allow the steel ball to roll out of the annular groove, so that the force of the second fixed seat on the reel is not a rigid impact. The role of the steel ball in providing resistance to the reel is in the process of the second spring acting on the reel. At this time, part of the kinetic energy of the reel has been consumed by the second spring. Therefore, during the process of the control device taking effect, it can also provide anti-impact protection for the various components in this solution, especially the threaded pair between the reel and the screw.

[0024] The hole is a through hole that passes through the second fixing seat;

[0025] In the channel, an end plug, a first spring, a centering shaft, and a steel ball are sequentially arranged from the outside to the inside of the channel. The end plug is fixed in the channel. One end of the first spring acts on the end plug and the other end acts on the centering shaft. A spherical surface is provided on the centering shaft, and the surface of the steel ball is in contact with the spherical surface. In this solution, the channel is set as a through hole. In terms of the assembly sequence of related parts, as a specific implementation method, it can be achieved: first complete the connection of the second fixed seat on the end face of the reel, and then install the steel ball, the centering shaft, the first spring and the end plug into the channel in sequence. In order to make the elastic compression amount of the first spring adjustable to correct or adjust the amount of energy consumed by the steel ball to detach from the annular groove, it is preferred to adopt a method in which the end plug is connected to the through hole through an internal thread provided in the through hole (the compression amount of the first spring is adjusted by rotating the end plug, and the above compression amount The positive pressure that affects the contact surface between the steel ball and the annular groove) is set to include the centering shaft, which is intended to achieve: when the steel ball is sheared, the contact force between the steel ball and the annular groove and the centering shaft is large and rolling friction occurs at the same time. In this way, the friction surfaces of the rolling friction can all be located on the annular groove surface, the steel ball surface and the spherical surface of the centering shaft. Compared with directly embedding the steel ball into the channel, by selecting wear-resistant materials or treating the friction surface that is convenient for surface wear-resistant treatment, the matching accuracy between the parts can be effectively guaranteed, so as to improve the life and performance stability of this solution. The centering of the centering shaft in the channel can be achieved by the first spring and / or the wall of the channel.

[0026] The present invention has the following beneficial effects:

[0027] This solution provides an energy absorbing component based on the characteristic that the drum will continue to move along the axis of the screw during its continued rotation, which is determined by the matching characteristics of the screw and the drum. The specific working principle is: the energy absorbing component is installed in front of the movement direction of the drum when the drum releases the wire rope, and at the same time, the retaining ring faces the end face of the drum. In this way, when the drum rotates in the direction of rotation of the released wire rope and further moves along the axis of the screw, since the energy absorbing component is arranged in front of the movement direction of the drum, when the drum contacts and squeezes the retaining ring, the thrust is transmitted through the second bearing to compress the second spring. As the drum further moves along the axis of the screw, the second spring is further squeezed until the drum is forced to stop rotating and translate along its own axis under the action of the energy absorbing component. Compared to placing a rigid constraint on the end of the drum, this energy-absorbing assembly effectively prevents damage to the drum's end surface, the threaded connection between the drum and the lead screw due to impact. Compared to rotating the drum unconstrained by inertia, this energy-absorbing assembly converts the drum's kinetic energy into the elastic potential energy of the second spring. This not only shortens the length of the wire rope released from the drum after the control rod is dropped, but also reduces the likelihood of the wire rope getting caught or entering the gear shaft meshing area by reducing the length of the slack section. Furthermore, since the corresponding lead screw is typically a ball screw, the drum can reversely rotate under the reverse push of the second spring to rewind some or all of the slack section of the wire rope after the drum's speed reaches zero, thereby improving the reliability of the drum assembly and the control rod drive mechanism. The second bearing allows the drum to rotate relative to the second spring, preventing wear on components of the assembly and the drum due to sliding friction caused by torque, thereby extending the service life of the control rod drive mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a specific application embodiment of a reel energy absorbing assembly described in this solution, which is a cross-sectional view;

[0029] Figure 2 for Figure 1 A partial enlarged view of part A is shown.

[0030] The reference numerals in the accompanying drawings are: 1. guide column, 2. first fixed seat, 3. second fixed seat, 4. elastic circlip for shaft, 5. linear bearing, 6. reel, 7. first bearing, 8. first gear, 9. first elastic circlip, 10. tightening screw, 11. second elastic circlip, 12. second set screw, 13. second gear, 14. limiting sleeve, 15. clamping block, 16. wire rope, 17. lead screw, 18. retaining ring, 19. steel ball, 20. first spring, 21. end plug, 22. centering shaft, 23. second bearing, 24. spacer, 25. second spring, 26. second set screw, 27. key, 28. annular groove. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited to the following embodiments:

[0032] Example 1:

[0033] like Figure 1 and Figure 2 As shown, a reel energy absorption assembly includes a first fixed seat 2, a second spring 25 with one end acting on the first fixed seat 2, and a retaining ring 18 arranged at the other end of the second spring 25. A second bearing 23 is provided between the retaining ring 18 and the second spring 25. The second bearing 23 is a thrust bearing that allows the retaining ring 18 to rotate relative to the second spring 25.

[0034] The shapes and sizes of the second spring 25 , the second bearing 23 and the retaining ring 18 satisfy the requirement that the three can be coaxially arranged.

[0035] In the prior art, methods for achieving emergency shutdown of a nuclear reactor include using an emergency control rod drop method. Taking the technical solution provided by application number CN202111412631.0 as an example, when the electromagnetic clutch is disconnected, the control rod falls under the action of its own gravity. Since the upper end of the control rod is connected to the wire rope 16, the wire rope 16 is partially wound on the drum 6. The drum 6 will rotate under the traction of the wire rope 16 during the falling process of the control rod. The rotation speed of the drum 6 is related to the falling speed of the control rod. During the process of falling without obstruction under the weight of the control rod and the specific falling height, the drum 6 may be accelerated to a speed far greater than the speed under the action of the drive mechanism (generally a drive motor). When the control rod interacts with the buffer mechanism in the pressure vessel, the drum 6 will further rotate under its own inertia. At this time, the wire rope 16 released by the drum 6 will change from a straight state to a relaxed state. Since the driving motor generally drives the drum 6 to rotate through a reducer, the driving mechanism generally has multiple sets of gear sets for realizing reduction transmission. At the same time, in order to further accurately determine the position of the fixed-point release of the wire rope 16, a guide wheel set is generally configured to constrain the position of the wire rope 16 in space. Therefore, after the control rod is dropped, the drum 6 continues to rotate and further releases the wire rope 16. A section of slack wire rope 16 will be formed between the release position of the wire rope 16 on the drum 6 and the guide wheel set. At the same time, the shape and position of this section of wire rope 16 are uncontrollable. When the wire rope 16 is hooked with other parts on the control rod drive mechanism or enters the meshing position of the gear set, the wire rope 16 will not be able to be reeled onto the drum 6 later, and may even be damaged or cut by the meshing gears, affecting the reliability of the drum 6 assembly and the control rod drive mechanism.

[0036] This solution provides an energy absorbing component based on the characteristic that the drum 6 will continue to move along the axis of the screw 17 during continued rotation, which is determined by the matching characteristics of the screw 17 and the drum 6. The specific working principle is: the energy absorbing component is installed in front of the movement direction when the drum 6 releases the wire rope 16, and at the same time, the retaining ring 18 faces the end face of the drum 6. In this way, when the drum 6 rotates in the direction of rotation of the released wire rope 16 and further moves along the axis of the screw 17, since the energy absorbing component is arranged in front of the movement direction of the drum 6, when the drum 6 contacts and squeezes the retaining ring 18, the thrust is transmitted through the second bearing 23, so that the second spring 25 is compressed. As the drum 6 further moves along the axis of the screw 17, the second spring 25 is further squeezed until the drum 6 is forced to stop rotating and translate along its own axis under the action of the energy absorbing component. In this way, compared with setting a rigid constraint at the end of the drum 6, the energy absorbing assembly can effectively prevent the end face of the drum 6, the threaded pair thereon, and between the drum 6 and the lead screw 17 from being damaged due to impact; compared with the drum 6 rotating without other constraints under inertia, the energy absorbing assembly converts the kinetic energy on the drum 6 into the elastic potential energy of the second spring 25. This not only shortens the length of the wire rope 16 that continues to be released from the drum 6 after the control rod is dropped, but also reduces the possibility of the wire rope 16 being hooked and entering the gear shaft meshing area by reducing the length of the slack section of the wire rope 16. At the same time, since the corresponding lead screw 17 is generally a ball screw 17, after the movement speed of the drum 6 is 0, the drum 6 can rotate in the opposite direction to wind up part or all of the slack section on the wire rope 16 under the reverse push of the second spring 25, thereby improving the reliability of the drum 6 assembly and the control rod drive mechanism. The second bearing 23 allows the drum 6 to rotate relative to the second spring 25, thereby preventing wear of components of the assembly and the drum 6 due to sliding friction caused by torque, thereby extending the service life of the control rod drive mechanism.

[0037] Example 2:

[0038] This embodiment is further defined on the basis of embodiment 1:

[0039] In the prior art, the lead screw 17 is generally mounted on the drum 6 assembly in a manner of being supported at both ends. The drum 6 is positioned on the axis of the lead screw 17 between the two ends of the lead screw 17. The lead screw 17 can be used as a mounting seat for the energy absorbing assembly to simplify the structure of the control rod drive mechanism and facilitate assembly of the energy absorbing assembly. The arrangement is as follows: a center hole is provided on each of the three, and when the three are coaxially arranged, the center holes of the three are coaxial. In this solution, the center holes on the three are all used for the screw 17 to pass through. Since each of them is assembled at a different axial position of the screw 17, by controlling the aperture of the center hole and / or the outer diameter of the corresponding shaft segment of the screw 17, etc., it can be specifically assembled as the first fixed seat 2 is fixed on the screw 17, the inner diameter of the center hole on the second spring 25 is larger than the outer diameter of the shaft segment of the inner screw 17, the thrust washer of the second bearing 23 close to the second spring 25 is fixed relative to the end of the second spring 25 away from the first fixed seat 2, the inner diameter of the thrust washer of the second bearing 23 close to the retaining ring 18 is larger than the outer diameter of the shaft segment of the inner screw 17, the thrust washer of the second bearing 23 close to the retaining ring 18 is embedded and fixed in the retaining ring 18 to achieve position positioning in the radial direction of the screw 17, and the retaining ring 18 can be rotatably and slidably sleeved on the outside of the screw 17.

[0040] As a technical solution with simple structure, small volume and convenient assembly, it is set as follows: the first fixing seat 2 is a cylindrical structure with an open end and an end plate at the other end, and the second spring 25 acts on the inner side of the end plate;

[0041] The end plate is provided with a center hole, and the three and the first fixing seat 2 can be assembled in such a manner that: the center hole on the end plate is coaxial with the center holes of the three;

[0042] The end plate is also provided with an internally threaded hole extending from the outer side of the end plate to the wall of the center hole on the end plate. A second set screw 26 is also threadedly connected to the internally threaded hole. This solution provides a specific structural form that facilitates the fixation of the first fixing seat 2 to the lead screw 17. By rotating the second set screw 26, the first fixing seat 2 is fixed to the lead screw 17 by utilizing the force between the end face of the second set screw 26 and the outer surface of the lead screw 17. The cylindrical housing of the first fixing seat 2 outside the second spring 25 not only serves to protect the second spring 25, but also serves as a carrier for the annular groove described below. The above four center holes are used to coaxially mount the energy absorbing assembly on the lead screw 17.

[0043] As a technical solution for utilizing the position of the retaining ring 18 in the radial direction of the lead screw 17 to constrain the radial position of the second bearing 23 in the lead screw 17, it is configured as follows: the center hole on the retaining ring 18 is a stepped hole, and the thrust washer at one end of the second bearing 23 close to the retaining ring 18 is fixed in the stepped hole. In specific implementation, it is preferably configured that the stepped hole on the retaining ring 18 has two stepped surfaces, and the two stepped surfaces make the stepped hole have three hole sections, wherein the inner diameters of the hole sections at both ends are larger than the inner diameter of the hole section located in the space, and the lead screw 17 is configured as a stepped shaft. In this way, the hole section close to the second bearing 23 is used to position the corresponding thrust washer in the axial direction and radial direction of the retaining ring 18, and the stepped surface of the hole section at the other end is used to cooperate with the stepped surface on the lead screw 17. The energy absorbing assembly is limited to a specific axial position on the axis of the lead screw 17 by using the first fixed seat 2 fixed on the axis of the lead screw 17.

[0044] Example 3:

[0045] This embodiment is further defined on the basis of embodiment 1:

[0046] This is a technical solution that is compact and transmits force through a spacer 24, thus preventing the second spring 25 from being misaligned due to deformation, which could ultimately cause a sudden change in the elastic force of the second spring 25 during deformation and impact on the reel 6. The following configuration is employed: the second spring 25 is composed of a plurality of stacked disc springs, with a spacer 24 disposed between any two adjacent disc springs; the outer diameter of the spacer 24 is greater than or equal to the outer diameter of the disc springs, and adjacent disc springs transmit force through the spacer 24. In a specific implementation of this solution, in order to fit the second spring 25 onto the lead screw 17, the spacer 24 is configured as an annular structure, and the inner diameter of the center hole of the spacer 24 is greater than the outer diameter of the lead screw 17 shaft section located within the spacer 24.

[0047] Example 4:

[0048] This embodiment is further defined on the basis of embodiment 1:

[0049] Different from the conventional field, the installation space provided for various components in the nuclear reactor structure design is limited. At the same time, the second spring 25 generally operates in an environment above room temperature. In order to control the compression of the second spring 25 to avoid the load size it bears in a single operation and thus prolong the service life of the second spring 25, it is configured to: further include a control device for controlling the elastic compression amount of the second spring 25, wherein the elastic compression amount is the elastic compression amount of the second spring 25 in the axial direction thereof;

[0050] The control device includes a second fixing seat 3 and a resistance member. The resistance member provides resistance to the movement of the second fixing seat 3 relative to the first fixing seat 2 along the axis of the first fixing seat 2 by being subjected to shear or compression. Those skilled in the art will appreciate that the above control device can achieve its purpose by bearing part or, at a certain moment, all of the thrust from the reel 6 during the elastic deformation of the second spring 25 under the action of the reel 6. Those skilled in the art may employ various forms of control devices without inventive effort.

[0051] As a specific implementation form, it is set as follows: the first fixing seat 2 is a cylindrical structure with one end open, and the second spring 25 is partially or completely located in the inner hole of the first fixing seat 2;

[0052] An annular groove extending along the circumferential direction of the first fixing seat 2 is also provided on the outer side surface of the first fixing seat 2;

[0053] The inner wall of the second fixing seat 3 is located outside the outer wall of the first fixing seat 2. The second fixing seat 3 is further provided with a channel having an opening on the inner wall. The control device further includes a steel ball 19 embedded in the channel. The channel is further provided with a first spring 20 for applying a thrust to the steel ball 19 so that the surface of the steel ball 19 contacts the outer wall.

[0054] The dimensions of the aperture, steel ball 19, and annular groove ensure that, as the second mounting base 3 moves along the axis of the first mounting base 2 in the direction of compressing the second spring 25, the steel ball 19 can be squeezed into the annular groove under the action of the first spring 20. At this time, the steel ball 19 acts as a component that withstands shear stress between the first and second mounting bases 2 and 3. Based on the cylindrical structure of the first mounting base 2, this solution is configured as a control device comprising the second mounting base 3, aperture, steel ball 19, first spring 20, and other components. This provides a technical solution that is easy to assemble, compact, and protects the control device from excessive stress. Specifically, the second fixed seat 3 is installed at the end of the reel 6 and is located on the outside of the first fixed seat 2 during use. When the second fixed seat 3 rotates with the reel 6 and translates along the axis of the screw 17, the steel ball 19 rotates relative to the axis of the screw 17 and translates along the axis of the screw 17. When the steel ball 19 is pushed into the annular groove under the action of the first spring 20, the steel ball 19 is sheared during the further movement of the reel 6. In this way, the thrust applied by the steel ball 19 to the second fixed seat 3 can prevent the second fixed seat 3 from moving further. This solution can not only utilize the action of the steel ball 19 on the second fixed seat 3 to provide resistance for the reel 6 to move further along the screw 17, but also be configured in the form of the first fixed seat 2 to allow the steel ball 19 to roll out of the annular groove, so that the force exerted by the second fixed seat 3 on the reel 6 is not a rigid impact, and the role of the steel ball 19 in providing resistance to the reel 6 is in the process of the second spring 25 acting on the reel 6. At this time, part of the kinetic energy of the reel 6 has been consumed by the second spring 25. Therefore, during the process of the control device taking effect, anti-impact protection can also be provided to the various components in this solution, especially the threaded pair between the reel 6 and the screw 17.

[0055] The channel is a through hole that passes through the second fixing seat 3;

[0056] In the channel, from the outside to the inside of the channel, an end plug 21, a first spring 20, a centering shaft 22, and a steel ball 19 are sequentially arranged. The end plug 21 is fixed in the channel. One end of the first spring 20 acts on the end plug 21 and the other end acts on the centering shaft 22. The centering shaft 22 is provided with a spherical surface, and the surface of the steel ball 19 is in contact with the spherical surface. In this solution, the channel is set as a through hole. In terms of the assembly sequence of related parts, as a specific implementation method, it can be achieved: first complete the connection of the second fixing seat 3 on the end face of the reel 6, and then install the steel ball 19, the centering shaft 22, the first spring 20 and the end plug 21 into the channel in sequence. In order to make the elastic compression amount of the first spring 20 adjustable to correct or adjust the amount of energy consumed by the steel ball 19 from being separated from the annular groove, it is preferred to adopt a method in which the end plug 21 is threadedly connected to the through hole through an internal thread set in the through hole (the compression amount of the first spring 20 is adjusted by rotating the end plug 21, so as to compress the steel ball 19). The shrinkage affects the positive pressure of the contact surface between the steel ball 19 and the annular groove), and is set to include the centering shaft 22, in order to achieve: when the steel ball 19 is sheared, the contact force between the steel ball 19 and the annular groove and the centering shaft 22 is large and rolling friction occurs at the same time. In this way, the friction surfaces of the rolling friction can all be located on the surface of the annular groove, the surface of the steel ball 19, and the spherical surface of the centering shaft 22. Compared with directly embedding the steel ball 19 into the channel, by selecting wear-resistant materials or treating the friction surface that is convenient for surface wear-resistant treatment, the matching accuracy between the parts can be effectively guaranteed, so as to improve the life and performance stability of this solution. The centering of the centering shaft 22 in the channel can be achieved by the first spring 20 and / or the wall of the channel.

[0057] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the scope of protection of the present invention.

Claims

1. A reel energy absorbing assembly, comprising a first fixed seat (2), a second spring (25) with one end acting on the first fixed seat (2), characterized in that: It also includes a retaining ring (18) arranged at the other end of the second spring (25), a second bearing (23) is provided between the retaining ring (18) and the second spring (25), and the second bearing (23) is a thrust bearing that enables the retaining ring (18) to rotate relative to the second spring (25); The shapes and sizes of the second spring (25), the second bearing (23), and the retaining ring (18) satisfy the requirement that the three can be coaxially arranged; Each of the three is provided with a central hole, and when the three are coaxially arranged, the central holes of the three are coaxial; The first fixing seat (2) is a cylindrical structure with an open end and an end plate provided at the other end, and the second spring (25) acts on the inner side of the end plate; The end plate is provided with a center hole, and the three and the first fixing seat (2) can be assembled in such a manner that: the center hole on the end plate is coaxial with the center holes of the three; The end plate is also provided with an internal threaded hole extending from the outer side of the end plate to the wall of the central hole of the end plate, and a second set screw (26) is threadedly connected to the internal threaded hole; It also includes a control device for controlling the elastic compression amount of the second spring (25), wherein the elastic compression amount is the elastic compression amount of the second spring (25) in the direction of its axis; The control device comprises a second fixing seat (3) and a resistance member, wherein the resistance member provides resistance for the second fixing seat (3) to move relative to the first fixing seat (2) along the axis of the first fixing seat (2) by being subjected to shear or compression; The first fixing seat (2) is a cylindrical structure with one end open, and the second spring (25) is partially or entirely located in the inner hole of the first fixing seat (2); An annular groove (28) extending along the circumferential direction of the first fixing seat (2) is also provided on the outer side surface of the first fixing seat (2); The inner wall of the second fixing seat (3) is located outside the outer wall of the first fixing seat (2); the second fixing seat (3) is further provided with a channel having an opening on the inner wall; the control device further comprises a steel ball (19) embedded in the channel; the channel is further provided with a first spring (20) for applying a thrust to the steel ball (19) so that the surface of the steel ball (19) contacts the outer wall; The respective dimensions of the hole, the steel ball (19), and the annular groove (28) are such that, when the second fixing seat (3) moves along the axis of the first fixing seat (2) in the direction of compressing the second spring (25), the steel ball (19) can be squeezed into the annular groove (28) under the action of the first spring (20). At this time, the steel ball (19) serves as a part that bears shear stress between the first fixing seat (2) and the second fixing seat (3).

2. The drum energy absorbing assembly according to claim 1, characterized in that: The center hole on the retaining ring (18) is a stepped hole, and a thrust washer at one end of the second bearing (23) close to the retaining ring (18) is fixed in the stepped hole.

3. The drum energy absorbing assembly according to claim 1, characterized in that: The second spring (25) is formed by stacking a plurality of disc springs, and a spacer (24) is provided between any two adjacent disc springs; the outer diameter of the spacer (24) is greater than or equal to the outer diameter of the disc spring, and adjacent disc springs transmit force through the spacer (24).

4. The drum energy absorbing assembly according to claim 1, characterized in that: The hole is a through hole that passes through the second fixing seat (3); In the channel, an end plug (21), a first spring (20), a centering shaft (22), and a steel ball (19) are sequentially arranged from the outside to the inside of the channel. The end plug (21) is fixed in the channel. One end of the first spring (20) acts on the end plug (21) and the other end acts on the centering shaft (22). A spherical surface is provided on the centering shaft (22), and the surface of the steel ball (19) is in contact with the spherical surface.

5. The drum energy absorbing assembly according to claim 4, characterized in that: The end plug (21) is threadedly connected to the through hole via an internal thread provided in the through hole.

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