A new type of suspension connector for control rod assembly extraction force detection

Abstract

The present invention belongs to the technical field of mechanical connection, and relates to a new type of hanging connector for detecting the pulling force of a control rod assembly, including a locking rod and a locking claw; one end of the locking rod is provided with a first conical surface; the other end is provided with an external thread; the locking claw is sleeved on the locking rod; one end of the locking claw is provided with a plurality of circumferentially distributed elastic claws, and the elastic claw is arranged in the inner hole of the control rod assembly; the inner side of the elastic claw contacts the first conical surface; the locking rod is also provided with a locking nut, the locking nut cooperates with the external thread, and the locking nut is arranged on one side of the locking claw; the locking rod is driven to move in the locking claw by rotating the locking nut, and the elastic claw is driven to open or contract through the first conical surface, so that the elastic claw contacts or separates from the inner hole wall of the control arm assembly. The connector in the present invention adopts a self-centering conical elastic self-locking to avoid the swing and torsion of the control rod assembly, and the overall structure is exquisite and simple, low cost, safe and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical connection and relates to a novel hanging connector for detecting the pulling and inserting force of a control rod assembly. Background Art

[0002] The nuclear fuel assembly is the core component of the nuclear power unit core, and its quality and reliability are directly related to the safety and life of the nuclear power plant. The manufacturing process of the nuclear fuel assembly is complex and has high safety and reliability requirements. After its production and manufacturing, its quality must be effectively tested, and the insertion and extraction force test is a key process. This test is usually completed using special testing equipment. The equipment is used to lift the test control rod assembly to a high place, and then smoothly and slowly insert it into the 24 guide tube holes of the nuclear fuel assembly. In this process, the connection between the control rod assembly and the equipment hanger is very critical.

[0003] Since the resistance value of the test is very small, if the control rod assembly connector is not well designed and installed carefully, it is easy for the control rod assembly to swing, twist or even tilt during the hanging process, thereby interfering with the test data and affecting the correct judgment of the quality of the nuclear fuel assembly. At the same time, during the test, the operators are basically under the hanging parts. If the safety of the tooling is not enough, it will become a safety hazard of the equipment. Summary of the invention

[0004] In view of this, the object of the present invention is to solve the connection problem during control rod assembly detection and to provide a new type of suspension connector for control rod assembly extraction force detection.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A new type of hanging connector for detecting the insertion and extraction force of a control rod assembly comprises a locking rod and a locking claw; one end of the locking rod is provided with a first conical surface; the other end is provided with an external thread; the locking claw is sleeved on the locking rod; one end of the locking claw is provided with a plurality of circumferentially distributed elastic claws, and the elastic claws are arranged in the inner hole of the control rod assembly; the inner side of the elastic claw contacts with the first conical surface; the locking rod is also provided with a locking nut, the locking nut cooperates with the external thread, and the locking nut is arranged on one side of the locking claw; the locking rod is driven to move in the locking claw by rotating the locking nut, and the elastic claw is driven to open or contract through the first conical surface, so that the elastic claw contacts or separates from the inner hole wall of the control arm assembly.

[0007] Furthermore, one end of the locking rod having the external thread is also provided with a threaded hole, and is connected to the sling through the threaded hole.

[0008] Furthermore, a slot is provided on the locking rod; a set screw is provided on the locking claw, one end of the set screw is arranged in the slot, and a locking force is applied to the locking rod through the set screw.

[0009] Furthermore, the locking rod is also provided with a locking nut, which cooperates with the external thread and is arranged on a side of the locking nut away from the locking claw.

[0010] Furthermore, a flat square for clamping with a wrench is provided at one end of the locking claw close to the locking nut.

[0011] Furthermore, a second conical surface is provided on the locking pawl, and the second conical surface is used to cooperate with the conical surface in the inner hole of the control rod assembly to achieve coaxial centering during assembly.

[0012] Furthermore, there are at least four elastic claws, and a slot is provided between two adjacent elastic claws; a protrusion is provided on the outer side of the elastic claw, and the cross-section of the protrusion is spherical. When the elastic claw is opened, the protrusion is clamped in the inner hole of the control rod assembly.

[0013] The beneficial effects of the present invention are:

[0014] 1. The locking claw of the present invention adopts a self-centering elastic structure, which is hollow inside and divided into eight petals by slotting at the tail, thereby improving the elasticity of the elastic claw and facilitating the cooperation with the conical structure of the locking rod to realize the opening and contraction of the elastic claw, thereby firmly connecting the control rod assembly and the equipment hanger.

[0015] 2. The locking round nut in the present invention is used to connect the locking claw and the locking rod and apply a pre-tightening force. In order to prevent loosening, an anti-loosening nut is also added to increase the reliability of the connector; the set screw is installed on the side of the locking claw, and is stuck in the slot of the locking rod after being screwed in, preventing the rod from twisting and loosening during use, thereby improving the reliability of the control rod assembly suspension.

[0016] 3. The connector in the present invention has an exquisite and simple overall structure, low cost, safety and reliability, which improves the stability and reliability of the control rod assembly insertion and extraction force measurement, and also significantly improves the safety of the equipment; at the same time, it is easy to disassemble and assemble, and has considerable promotion and application value.

[0017] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the control rod assembly;

[0020] Figure 2 It is a schematic diagram of the hanging connector in the present invention;

[0021] Figure 3 It is a schematic diagram of the locking rod;

[0022] Figure 4 It is a cross-sectional view of the locking claw;

[0023] Figure 5 It is a three-dimensional diagram of the locking claw.

[0024] Attached diagram: 1-locking rod; 2-locking claw; 3-locking nut; 4-locking nut; 5-hanging fixture; 6-control rod assembly; 7-setting screw; 11-first conical surface; 12-external thread; 13-threaded hole; 14-slot; 21-elastic claw; 22-second conical surface; 23-protrusion. DETAILED DESCRIPTION

[0025] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing 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 operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] See also Figures 1 to 5 , which is a new type of hanging connector for detecting the insertion and extraction force of a control rod assembly, comprising a locking rod 1 and a locking claw 2; one end of the locking rod 1 is provided with a first conical surface 11; the other end is provided with an external thread 12; the locking claw 2 is sleeved on the locking rod 1; one end of the locking claw 2 is provided with a plurality of elastic claws 21 distributed in a circumference, and the elastic claw 21 is installed in the inner hole of the control rod assembly 6; the inner side of the elastic claw 21 contacts the first conical surface 11; a locking nut 3 is also provided on the locking rod 1, the locking nut 3 cooperates with the external thread 12, and the locking nut 3 is installed on one side of the locking claw 2; the locking rod 1 is driven to move in the locking claw 2 by rotating the locking nut 3, and the elastic claw 21 is driven to open or contract through the first conical surface 11, so that the elastic claw 21 contacts or separates from the inner hole wall of the control arm assembly.

[0029] Among them, one end of the locking rod 1 provided with an external thread 12 is also provided with a threaded hole 13, and the sling 5 is connected to the locking rod 1 through the threaded hole 13. The locking rod 1 is also provided with a card slot 14; the locking claw 2 is provided with a set screw 7, one end of which is installed in the card slot 14, and a locking force is applied to the locking rod 1 through the set screw 7. The locking rod 1 is also provided with a lock nut 4, which cooperates with the external thread 12 and is installed on the side of the locking nut 3 away from the locking claw 2 to prevent the locking nut 3 from loosening.

[0030] The locking claw 2 is provided with a flat square for wrench clamping at one end close to the locking nut 3, which is convenient for external force locking. The locking claw 2 is provided with a second conical surface 22, which is used to cooperate with the conical surface in the inner hole of the control rod assembly 6 to achieve coaxial centering during assembly.

[0031] There are eight elastic claws 21, and a slot is provided between two adjacent elastic claws 21, so that the elastic claws 21 can be elastically opened and closed; a protrusion 23 is provided on the outer side of the elastic claw 21, and the protrusion 23 matches the groove in the inner hole of the control rod assembly 6. When the elastic claw 21 is opened, the protrusion 23 is inserted into the groove in the inner hole of the control rod assembly 6, making the connection more stable.

[0032] The method of using the new hanging connector in this embodiment is as follows:

[0033] 1. Pass the locking rod 1 through the inner cavity of the locking claw 2, and then put the two together into the end hole of the star frame of the control rod assembly 6. The first conical surface of the locking rod 1 does not enter the elastic claw 21 of the locking claw 2. At this time, the eight elastic claws 21 are in a relaxed state. The connector can be taken out freely.

[0034] 2. When the locking nut 3 at the tail of the locking rod 1 is tightened, the locking rod 1 extends outward relative to the locking claw 2, and the first conical surface 11 enters the inner side of the elastic claw 21, gradually expanding the elastic claw 21 and embedding it into the groove at the end of the star frame of the control rod assembly 6. Since the protrusion 23 of the elastic claw 21 is spherical, the vertical accuracy of the control rod assembly 6 can be automatically adjusted during the locking process, avoiding the skew caused by the uneven screw-in surface and angle deviation of the ordinary connector during the connection process, thereby improving the measurement and installation accuracy of the nuclear fuel assembly.

[0035] 3. After tightening in place, screw the set screw 7 into the slot 14 of the locking rod 1 to prevent the rod from twisting or loosening during use.

[0036] 4. Connect the lifting device 5 of the test equipment through the threaded hole 13 at the tail of the locking rod 1, and lift it up for testing.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A new type of suspension connector for detecting the insertion and extraction force of a control rod assembly, characterized in that: It comprises a locking rod and a locking claw; one end of the locking rod is provided with a first conical surface; the other end is provided with an external thread; the locking claw is sleeved on the locking rod; one end of the locking claw is provided with a plurality of circumferentially distributed elastic claws, and the elastic claws are arranged in the inner hole of the control rod assembly; the inner side of the elastic claw contacts with the first conical surface; the locking rod is also provided with a locking nut, the locking nut cooperates with the external thread, and the locking nut is arranged on one side of the locking claw; the locking rod is driven to move in the locking claw by rotating the locking nut, and the elastic claw is driven to open or contract through the first conical surface, so that the elastic claw contacts or separates from the inner hole wall of the control arm assembly; The locking claw is provided with a second conical surface, which is used to cooperate with the conical surface in the inner hole of the control rod assembly to achieve coaxial centering of the assembly; there are at least four elastic claws, and a groove is provided between two adjacent elastic claws; a protrusion is provided on the outer side of the elastic claw, and the cross section of the protrusion is spherical. When the elastic claw is opened, the protrusion is clamped in the groove of the inner hole of the control rod assembly; The locking rod is also provided with a slot; the locking claw is provided with a set screw, one end of which is arranged in the slot, and a locking force is applied to the locking rod through the set screw.

2. The novel suspension connector for detecting the insertion and extraction force of the control rod assembly according to claim 1 is characterized in that: One end of the locking rod provided with an external thread is also provided with a threaded hole, and is connected to the sling through the threaded hole.

3. The novel suspension connector for detecting the insertion and extraction force of a control rod assembly according to claim 1 is characterized in that: The locking rod is also provided with a locking nut, which cooperates with the external thread and is arranged on a side of the locking nut away from the locking claw.

4. The novel suspension connector for detecting the insertion and extraction force of a control rod assembly according to claim 1 is characterized in that: One end of the locking claw close to the locking nut is provided with a flat square for clamping with a wrench.

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