Bidirectional ultrasonic inspection probe for inner holes of nuclear reactor bolts

Abstract

The present invention provides a bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt, comprising a mounting bracket and a probe, wherein the mounting bracket comprises a support frame and a support tube, and the support frame is also elastically connected to a probe bracket, and the upper surface of the probe bracket has symmetrical inclined surfaces on both sides, and the probe is fixed on the inclined surfaces, and the lower surface of the probe bracket is inwardly recessed and has two symmetrically arranged inner concave surfaces pointing to the upper surface of the probe bracket and intersecting to form a tip; an expansion sleeve that can be supported between the outer wall of the support tube and the inner hole of the bolt is fixed on the support tube. The present invention has a reasonable structural design, can effectively improve the stability of the probe when entering the inner hole of the bolt for detection, maintain the concentricity of the probe as a whole and the inner hole of the bolt, and improve the detection quality and detection accuracy.

Description

Technical Field

[0001] The invention relates to the field of nuclear power facility detection, in particular to the technical field of reactor bolt detection, and in particular to a bidirectional ultrasonic inspection probe for inner holes of nuclear power reactor bolts. Background Art

[0002] The reactor is the core component of a nuclear power facility. The reactor body includes a pressure vessel, a core, internals and a control rod drive mechanism. The internals provide a flow path for the reactor coolant and a shield for the pressure vessel to protect it from or reduce the impression of core seed radiation. At the same time, they can fix irradiated samples for supervision, provide support and deposit for fuel assemblies, and provide mechanical guidance for the rod bundle control assembly and drive shaft as well as the upper and lower in-core measuring devices. They can balance mechanical loads and hydraulic loads, ensure the circulation of cooling water in the top cover of the reactor vessel, so that the top cover can maintain a certain temperature. The core shroud assembly establishes the boundary of the core fuel area. The shroud assembly consists of dozens of shrouds (vertical plates) in a zigzag shape, which are connected to the axial radial plates (horizontal reinforcement plates) with screws.

[0003] During the production and assembly process, the inner hole of the bolt needs to be checked for horizontality. After the ordinary inspection probe enters the inner hole of the bolt, since the outer diameter of the inspection probe is usually smaller than the inner diameter of the bolt hole, the probe is prone to shaking during the movement of the probe, causing the center of the inspection probe to shake, affecting the accuracy of the detection. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of the prior art, the present invention provides a bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt, which can be guided into the inner hole of the bolt and can effectively avoid shaking when moving and detecting in the inner hole, thereby maintaining the concentricity of the probe as a whole and the inner hole of the bolt and improving the detection accuracy.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt, which is used to extend into the inner hole of the bolt for inspection and detection after being connected, and includes a mounting bracket and a probe fixedly mounted on the mounting bracket. The mounting bracket includes a support frame, a support tube respectively connected to the front and rear ends of the support frame, and a probe bracket is elastically connected to the support frame. The upper surface of the probe bracket has symmetrical inclined surfaces on both sides, which connect the upper surface and the lower surface of the probe bracket, and the probe is fixed on the inclined surfaces. The lower surface of the probe bracket is concave inward and has two symmetrically arranged inner concave surfaces that point to the upper surface of the probe bracket and intersect to form a tip; an expansion sleeve that can be stretched and supported between the outer wall of the support tube and the inner hole of the bolt is fixed on the support tube.

[0006] In the above scheme, the probes can be symmetrically fixed in pairs on the inclined surfaces on both sides of the probe holder, and enter the inner hole of the bolt with the probe holder for detection. Since the probe holder and the support frame are elastically connected, the upper surface of the probe holder can be pressed into the inner hole of the bolt during the process of entering the inner hole, and the distance between the probe holder and the support frame can be adjusted according to the size of the inner hole. The design of the expansion sleeve can support the probe between the inner wall of the inner hole and the outer wall of the support tube after the probe enters the inner hole, maintain the stability of the probe during the movement of the probe, improve the concentricity of the probe, and improve the detection quality and detection accuracy.

[0007] Preferably, the angle between the two inner concave surfaces of the probe bracket is preferably 106°.

[0008] Furthermore, in order to facilitate the elastic setting of the probe bracket, the support frame is provided with concave holes on the surfaces on both sides of the inner concave surface, and a spring is fixed between the bottom of the inner concave hole and the lower surface of the probe bracket.

[0009] Furthermore, in order to play a good guiding role at the front end, facilitate the overall entry of the probe, and play a good stopping role after the probe enters, the expansion sleeve includes a front-end expansion sleeve group on the support tube located at the front end of the support frame and a rear-end expansion sleeve group on the support tube at the rear end of the support frame; the front-end expansion sleeve group includes at least one guiding expansion sleeve located at the front end and at least one stopping expansion sleeve located at the rear end, and the rear-end expansion sleeve group includes at least one group of stopping expansion sleeves designed in pairs; the guiding expansion sleeve and the stopping expansion sleeve are both sleeve structures, and the sleeve structure has a hollow interior that is connected to the support frame. The outer wall of the support tube cooperates with the inner hole for insertion, and the sleeve structure includes a guide sleeve, an intermediate sleeve and a claw sleeve connected in sequence. The guide sleeve is a truncated cone structure with an inner hole, and the radius of the connecting surface with the intermediate sleeve is larger than the radius of the other side of the truncated cone structure, and the claw sleeve is a claw sleeve body that expands outward and is supported between the outer wall of the support tube and the inner hole of the bolt; the height of the truncated cone structure of the guide expansion sleeve is larger than the height of the truncated cone structure of the stop expansion sleeve, and the angle between the outer circumferential surface of the truncated cone structure of the guide expansion sleeve and the inner hole is smaller than the angle between the outer circumferential surface of the truncated cone structure of the stop expansion sleeve and the inner hole.

[0010] Furthermore, the front-end expansion sleeve group includes a guide expansion sleeve and a stop expansion sleeve, and the truncated cone-shaped structure of the guide expansion sleeve points to the front end of the support tube, the stop expansion sleeve is arranged behind the guide expansion sleeve, and the truncated cone-shaped structure of the guide expansion sleeve is connected to the guide expansion sleeve; the rear-end expansion sleeve group includes two stop expansion sleeves with opposite and symmetrical end faces of the truncated cone-shaped structure.

[0011] Furthermore, in order to facilitate the installation and fixation of the expansion sleeve, the front-end expansion sleeve assembly and the rear-end expansion sleeve assembly are both locked and positioned with the corresponding support pipes by means of gaskets and bolts.

[0012] The beneficial effect of the present invention is that the bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt provided by the present invention has a reasonable structural design, and the mounting structure of the probe and the support tube and expansion sleeve structures at both ends are reasonably designed, which can effectively improve the stability of the probe when entering the inner hole of the bolt for detection, maintain the concentricity of the probe as a whole and the inner hole of the bolt, and improve the detection quality and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a structural schematic diagram of the best embodiment of the present invention.

[0015] Figure 2 It is a structural schematic diagram of the guide expansion sleeve.

[0016] Figure 3 It is a structural schematic diagram of the anti-retraction expansion sleeve.

[0017] In the figure, 1, support tube 2, support frame 3, spring 4, probe bracket 5, guide expansion sleeve 6, anti-retraction expansion sleeve 7, guide sleeve 8, intermediate sleeve 9, claw sleeve 10, inner hole. DETAILED DESCRIPTION

[0018] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] like Figures 1 to 3 The bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt shown is the optimal embodiment of the present invention. The bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt is used to extend into the inner hole of the bolt for inspection and detection after being connected, and includes a mounting bracket and a probe fixedly mounted on the mounting bracket.

[0020] The mounting bracket includes a support frame 2, a support tube 1 respectively connected to the front and rear ends of the support frame 2, and a probe bracket 4 is elastically connected to the support frame 2. In the actual design, in order to facilitate the elastic setting of the probe bracket 4, the support frame 2 has concave holes on the surface corresponding to both sides of the inner concave surface, and a spring 3 is connected and fixed between the bottom of the inner concave hole and the lower surface of the probe bracket 4.

[0021] The upper surface of the probe bracket 4 has symmetrical inclined surfaces on both sides, which connect the upper surface and the lower surface of the probe bracket 4, and the probe is fixed on the inclined surface. The lower surface of the probe bracket 4 is recessed inward and has two symmetrically arranged inner concave surfaces pointing to the upper surface of the probe bracket 4 and intersecting to form a tip. The angle between the two inner concave surfaces is preferably 106°. An expansion sleeve that can be supported between the outer wall of the support tube 1 and the inner hole of the bolt is fixed on the support tube 1.

[0022] In order to play a good guiding role at the front end, facilitate the overall entry of the probe, and play a good anti-retreat role after the probe enters, the expansion sleeve includes a front-end expansion sleeve group located on the support tube 1 at the front end of the support frame 2 and a rear-end expansion sleeve group located on the support tube 1 at the rear end of the support frame 2. The front-end expansion sleeve group includes a guide expansion sleeve 5 located at the front end and an anti-retreat expansion sleeve 6 located at the rear end. The truncated cone-shaped structure of the guide expansion sleeve 5 of the front-end expansion sleeve group points to the front end of the support tube 1, and the anti-retreat expansion sleeve 6 is arranged behind the guide expansion sleeve 5 and the truncated cone-shaped structure of the guide expansion sleeve 5 is connected to the guide expansion sleeve 5. The rear-end expansion sleeve group includes a group of anti-retreat expansion sleeves 6 designed in pairs, that is, two anti-retreat expansion sleeves 6 with opposite and symmetrical end faces of the truncated cone-shaped structure.

[0023] The guide expansion sleeve 5 and the anti-retreat expansion sleeve 6 are both sleeve structures. The sleeve structure is hollow inside and has an inner hole 10 that cooperates with the outer wall of the support tube 1. The sleeve structure is made of a nylon elastic sleeve of an integral structure, including a guide sleeve 7, an intermediate sleeve 8 and a claw sleeve 9 connected in sequence. The guide sleeve 7 is a truncated cone structure with an inner hole 10, and the radius of the connecting surface with the intermediate sleeve 8 is larger than the radius of the other side of the truncated cone structure. The claw sleeve 9 is a claw sleeve 9 body that expands outward and is supported between the outer wall of the support tube 1 and the inner hole of the bolt; the height of the truncated cone structure of the guide expansion sleeve 5 is greater than the height of the truncated cone structure of the anti-retreat expansion sleeve 6, and the angle between the outer circumferential surface of the truncated cone structure of the guide expansion sleeve 5 and the inner hole 10 is smaller than the angle between the outer circumferential surface of the truncated cone structure of the anti-retreat expansion sleeve 6 and the inner hole 10.

[0024] In order to facilitate the installation and fixation of the expansion sleeve, the front-end expansion sleeve assembly and the rear-end expansion sleeve assembly are locked and positioned with the corresponding support pipe 1 by means of gaskets and bolts.

[0025] In actual use, the front expansion sleeve is located at the entry end of the probe as a whole, and the rear expansion sleeve is located at the tail end of the probe as a whole. When entering the inner hole of the bolt, the guide expansion sleeve 5 of the front expansion sleeve enters first. At this time, the longer truncated cone-shaped structure causes the circumferential outer surface of the guide expansion sleeve 5 to form a relatively gentle guide slope, which can help guide the probe into the inner hole 10. After entering, the truncated cone-shaped structure is shorter in height inside the stop expansion sleeve 6 of the rear expansion sleeve, and the claw sleeve 9 is partially located at the tail end of the probe as a whole. The claw sleeve 9 elastically expands and supports between the support tube 1 and the inner hole 10, which has a good stop effect when the probe moves forward.

[0026] The probes of the nuclear power reactor bolt inner hole bidirectional ultrasonic inspection probe designed in this way can be symmetrically fixed in pairs on the inclined surfaces on both sides of the probe holder 4, and enter the bolt inner hole for detection along with the probe holder 4. Since the probe holder 4 is elastically connected to the support frame 2, the upper surface of the probe holder 4 can be pressed into the bolt inner hole during the process of entering the inner hole 10, and the distance between the probe holder 4 and the support frame 2 can be adjusted according to the size of the inner hole 10. The design of the expansion sleeve can support the probe between the inner wall of the inner hole 10 and the outer wall of the support tube 1 after the probe enters the inner hole 10, so as to maintain the stability of the probe during the movement of the probe, improve the concentricity of the probe, and improve the detection quality and detection accuracy.

[0027] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bidirectional ultrasonic inspection probe for the inner hole of a nuclear power reactor bolt, which is used to extend into the inner hole of the bolt for inspection and detection after being connected, and is characterized by: The invention comprises a mounting bracket and a probe fixedly mounted on the mounting bracket, wherein the mounting bracket comprises a supporting frame (2), a supporting tube (1) respectively connected to the front and rear ends of the supporting frame (2), the supporting frame (2) is also elastically connected to a probe bracket (4), the upper surface of the probe bracket (4) has symmetrical inclined surfaces on both sides, the inclined surfaces connect the upper surface and the lower surface of the probe bracket (4), and the probe is fixed on the inclined surfaces, the lower surface of the probe bracket (4) is inwardly concave and has two symmetrically arranged inner concave surfaces pointing to the upper surface of the probe bracket (4) and intersecting to form a tip; an expansion sleeve is fixed on the supporting tube (1) and can be supported between the outer wall of the supporting tube (1) and the inner hole of the bolt; The expansion sleeve comprises a front expansion sleeve group located on a support tube (1) at the front end of the support frame (2) and a rear expansion sleeve group located on the support tube (1) at the rear end of the support frame (2); the front expansion sleeve group comprises at least one guide expansion sleeve (5) located at the front end and at least one stop expansion sleeve (6) located at the rear end, and the rear expansion sleeve group comprises at least one set of stop expansion sleeves (6) designed in pairs; the guide expansion sleeve (5) and the stop expansion sleeve (6) are both sleeve structures, the sleeve structure is hollow inside and has an inner hole (10) that is plugged into the outer wall of the support tube (1), and the sleeve structure comprises guide sleeves (7) connected in sequence. , an intermediate sleeve (8) and a claw sleeve (9), wherein the guide sleeve (7) is a truncated cone structure having an inner hole (10), and the radius of the connection surface with the intermediate sleeve (8) is larger than the radius of the other side of the truncated cone structure, and the claw sleeve (9) is a claw sleeve (9) body that expands outward and is supported between the outer wall of the support tube (1) and the inner hole of the bolt; the height of the truncated cone structure of the guide expansion sleeve (5) is larger than the height of the truncated cone structure of the stop expansion sleeve (6), and the angle formed between the outer circumference of the truncated cone structure of the guide expansion sleeve (5) and the inner hole (10) is smaller than the angle formed between the outer circumference of the truncated cone structure of the stop expansion sleeve (6) and the inner hole (10).

2. The bidirectional ultrasonic inspection probe for inner holes of nuclear power reactor bolts according to claim 1, characterized in that: The angle between the two inner concave surfaces of the probe bracket (4) is preferably 106°.

3. The bidirectional ultrasonic inspection probe for inner holes of nuclear power reactor bolts according to claim 1, characterized in that: The support frame (2) has concave holes on its surfaces at both sides corresponding to the concave surface, and a spring (3) is fixed between the bottom of the concave hole and the lower surface of the probe bracket (4).

4. The bidirectional ultrasonic inspection probe for inner holes of nuclear power reactor bolts according to claim 1, characterized in that: The front end expansion sleeve assembly comprises a guide expansion sleeve (5) and a stop expansion sleeve (6), wherein the truncated cone-shaped structure of the guide expansion sleeve (5) points to the front end of the support tube (1), the stop expansion sleeve (6) is arranged behind the guide expansion sleeve (5), and the truncated cone-shaped structure of the guide expansion sleeve (5) is connected to the guide expansion sleeve (5); the stop expansion sleeve (6) comprises two stop expansion sleeves (6) whose end faces of the truncated cone-shaped structure are opposite and symmetrically arranged.

5. The bidirectional ultrasonic inspection probe for inner holes of nuclear power reactor bolts according to claim 4, characterized in that: The front end expansion sleeve and the rear end expansion sleeve are both locked and positioned with the corresponding support pipe (1) by means of gaskets and bolts.

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