A pressure vessel bolt hole thread inspection device

Abstract

The present invention discloses a pressure vessel bolt hole thread inspection device, including a body assembly and a camera assembly, wherein the body assembly and the camera assembly are connected by a connecting block and can be quickly disassembled and assembled. The body lower plate, support column, body upper plate, camera assembly connecting block, first positioning assembly, second positioning assembly, second positioning block, guide rod, third positioning assembly, first positioning block, lifting cylinder, travel wheel, proximity sensor, limit screw, sliding plate, guide wheel and travel cylinder, the body lower plate and the body upper plate are connected to form a body structure by the support column, and a travel wheel is installed at the lower part of the body lower plate. The beneficial effect is that: through the limitation of the limit screw, it is ensured that when the sliding plate is in the two extreme positions, the center of the positioning block on the sliding plate is exactly aligned with the center of the adjacent light hole on the top cover; when the sliding plate and the positioning block on the body extend into the light hole, the positioning of the body relative to the top cover can be achieved.

Description

Technical Field

[0001] The invention belongs to an inspection device, and in particular relates to a pressure vessel bolt hole thread inspection device. Background Art

[0002] Video inspection of reactor pressure vessel (RPV) bolt holes is a necessary task during nuclear power plant overhaul. The purpose is to conduct video inspection of the cleaned main screw hole threads. If thread defects are found, thread repair is required to create conditions for the main bolts to be screwed in smoothly to avoid bolt seizure. At present, power plants at home and abroad generally use bolt hole video inspection devices to inspect threads.

[0003] At present, when the existing reactor units conduct video inspections on bolt hole threads, most of them will first lift off the reactor top cover and place a false top cover, and then use the bolt hole thread inspection device to move on the pressure vessel flange surface and conduct video inspections on the threads. In order to save overhaul time and workload, some units such as AP1000 do not lift off the top cover during video inspections on bolt hole threads, but remain above the pressure vessel. In this case, the bolt hole thread inspection device can only move on the top cover flange surface and conduct video inspections on the pressure vessel bolt hole threads. At present, the video inspection devices developed by relevant domestic institutions can only move on the pressure vessel flange surface, which cannot meet the needs of video inspections on pressure vessel bolt hole threads with the top cover in place. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure vessel bolt hole thread inspection device, which can move and position on the surface of the reactor top cover flange by using the circumferentially distributed light holes on the top cover. After the vehicle body moves into place, the video inspection component extends through the top cover light hole into the main screw hole of the pressure vessel to perform video inspection on the thread.

[0005] The technical solution of the present invention is as follows: a pressure vessel bolt hole thread inspection device comprises a body assembly and a camera assembly, wherein the body assembly and the camera assembly are connected via a connecting block and can be quickly assembled and disassembled.

[0006] The vehicle body lower plate, support column, vehicle body upper plate, camera assembly connecting block, first positioning assembly, second positioning assembly, second positioning block, guide rod, third positioning assembly, first positioning block, lifting cylinder, walking wheel, proximity sensor, limit screw, sliding plate, guide wheel and walking cylinder, the vehicle body lower plate and the vehicle body upper plate are connected to form a vehicle body structure through support columns, and walking wheels are installed at the lower part of the vehicle body lower plate.

[0007] The sliding plates are respectively provided with a positioning assembly, namely a first positioning assembly and a third positioning assembly, and the middle part of the lower plate of the vehicle body is provided with a second positioning assembly.

[0008] The first positioning assembly, the second positioning assembly and the third positioning assembly include a positioning block, a lifting cylinder and a guide rod.

[0009] The two side edges of the sliding plate are arcs, and the sliding plate is supported and guided by the V-shaped grooves in the inner and outer guide wheels of the lower plate of the vehicle body, so that the sliding plate can move along the distribution direction of the guide wheels. The front and rear sliding plates can slide forward and backward respectively under the drive of the travel cylinder.

[0010] Two limit screws are installed on both sides of the sliding plate, and a fan-shaped hole is opened at the front and rear ends of the lower plate of the vehicle body. When the sliding plate is at the front and rear limit positions, the positioning component on the sliding plate is aligned with the center of the top cover light hole.

[0011] The proximity sensor is installed on the lower plate of the vehicle body.

[0012] The camera assembly includes an upper frame, a guide rod, a lower frame, a screw nut, a lifting motor, a large hollow turntable, a cylinder, a rotating motor, a small hollow turntable and a camera assembly. The upper frame is fixedly connected to the lower frame, the guide rod is connected to the upper frame, the lifting motor is fixed to the bottom of the upper frame, the large hollow turntable is fixed to the top of the lower frame, the lifting motor and the large hollow turntable are fixedly connected together, the screw nut passes through the large hollow turntable, the large hollow turntable is fixedly connected to the nut in the screw nut, and the lifting motor drives the nut to rotate through the large hollow turntable to drive the screw to move up and down.

[0013] The lower end of the screw in the screw nut is connected to a cylinder, in which a rotating motor and a small hollow turntable are installed. The small hollow turntable is connected to a camera assembly. The rotating motor can drive the camera assembly to rotate through the small hollow turntable, and the camera in the camera assembly shoots the main screw hole thread.

[0014] The vehicle body assembly and the camera assembly are fixed together by a camera assembly connecting block. When the equipment is stored and transported, the vehicle body assembly and the camera assembly can be quickly disassembled.

[0015] The beneficial effects of the present invention are as follows: by limiting the limit screws, it is ensured that when the sliding plate is in the two extreme positions, the center of the positioning block on the sliding plate is just aligned with the center of the adjacent light hole on the top cover; when the positioning blocks on the sliding plate and the vehicle body extend into the light holes, the vehicle body can be positioned relative to the top cover; the arc-shaped sliding plate, the arc-shaped guide rail and the telescopic cooperation of the front and rear sliding plates can enable the equipment to move along the arc of the flange surface; when the equipment is working, at least two positioning blocks extend into the light hole of the top cover under any circumstances, which ensures the stable position of the equipment relative to the pressure vessel, and can ensure reliable positioning without the risk of deviation; the lifting motor drives the screw nut to extend the camera assembly into the screw hole, and the rotating motor drives the camera assembly to rotate to achieve the shooting of the main screw hole thread; the camera assembly and the vehicle body assembly can be quickly connected and disassembled, which is beneficial to the packaging and transportation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of a pressure vessel bolt hole thread inspection device provided by the present invention;

[0017] Figure 2 It is a schematic diagram of the vehicle body assembly;

[0018] Figure 3 for Figure 2 BB direction schematic diagram;

[0019] Figure 4 Schematic diagram of the camera assembly.

[0020] In the figure: 1 camera assembly, 2 body assembly, 3 body lower plate, 4 support column, 5 body upper plate, 6 camera assembly connecting block, 7 first positioning assembly, 8 second positioning assembly, 9 second positioning block, 10 guide rod, 11 third positioning assembly, 12 first positioning block, 13 lifting cylinder, 14 walking wheel, 15 proximity sensor, 16 limit screw, 17 sliding plate, 18 guide wheel, 19 walking cylinder, 20 upper frame, 21 guide rod, 22 lower frame, 23 screw nut, 24 lifting motor, 25 large hollow turntable, 26 cylinder, 27 rotating motor, 28 small hollow turntable, 29 camera assembly. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] A pressure vessel bolt hole thread inspection device comprises a body component and a camera component.

[0023] The vehicle body components include: an upper vehicle body plate, a lower vehicle body plate, a support rod, a positioning component, a sliding plate, a guide wheel, a cylinder, a limit screw, a running wheel, etc.

[0024] The camera assembly includes: an upper frame, a lower frame, a screw nut, a camera assembly, a lifting motor, a rotating motor, a hollow turntable, etc.

[0025] The vehicle body assembly has the functions of walking and positioning the vehicle body. The upper and lower plates of the vehicle body, the support rods and the walking wheels form the frame of the vehicle body assembly. In the middle of the vehicle body assembly, a positioning assembly is installed. The positioning assembly consists of a positioning plate, a guide rod, a lifting cylinder and a positioning block. The positioning block can move up and down under the drive of the lifting cylinder. A sliding plate is installed at the head and tail of the lower plate of the vehicle body. The edge of the sliding plate is arc-shaped and is guided by the guide wheels installed in a circumferential manner on the inner and outer sides of the lower plate of the vehicle body. The sliding plate can slide back and forth under the drive of the walking cylinder. A positioning assembly is installed on the sliding plate. Through the limit screw, when the sliding plate is in the front and rear extreme positions, the center of the positioning block on the sliding plate is just aligned with the center of the adjacent light hole on the top cover. The positioning block can be extended into the light hole of the top cover by the lifting cylinder to complete the positioning of the vehicle body relative to the bolt hole of the pressure vessel. At the same time, the walking function of the vehicle body can be completed by the cooperation of the telescopic front and rear sliding plates. The motion track of the slide plate is an arc structure, and the arc is concentric with the outer circle of the reactor pressure vessel flange surface, ensuring that the moving track is adapted to the distribution circle of the screw holes of the pressure vessel.

[0026] The camera assembly is used to perform video inspection on the main screw hole after the vehicle body is positioned relative to the pressure vessel. After the vehicle body is positioned, the lifting motor drives the screw nut to extend the camera assembly into the main screw hole. After the camera assembly is lowered into place, the rotating motor drives the camera assembly to rotate one circle to shoot the main screw hole thread.

[0027] like Figure 1-4 As shown, a pressure vessel bolt hole thread inspection device comprises a body assembly 1 and a camera assembly 2, wherein the body assembly 1 and the camera assembly 2 are fixed together by a camera assembly connecting block 6. During storage and transportation, the body assembly 1 and the camera assembly 2 can be disassembled and placed in a packaging box.

[0028] like Figure 2 As shown, the vehicle body assembly 1 includes: a vehicle body lower plate 3, a support column 4, a vehicle body upper plate 5, a camera assembly connection block 6, a first positioning assembly 7, a second positioning assembly 8, a second positioning block 9, a guide rod 10, a third positioning assembly 11, a first positioning block 12, a lifting cylinder 13, a running wheel 14, a proximity sensor 15, a limit screw 16, a sliding plate 17, a guide wheel 18 and a running cylinder 19, wherein the vehicle body lower plate 3 and the vehicle body upper plate 5 are connected to form a vehicle body structure through the support column 4, and a running wheel 14 is installed at the lower part of the vehicle body lower plate 3. The relative positions of the vehicle body lower plate 3, the vehicle body upper plate 5 and the running wheel 14 remain fixed.

[0029] The front and rear sliding plates 17 are respectively provided with a first positioning assembly 7 and a third positioning assembly 11, and the middle of the lower plate 3 of the vehicle body is provided with a second positioning assembly 8. The first positioning assembly 7, the second positioning assembly 8 and the third positioning assembly 11 include a positioning block, a lifting cylinder and a guide rod, and the lifting cylinder can drive the positioning block to move up and down along the guide rod.

[0030] Ten guide wheels 18 are respectively installed at the front and rear ends of the lower plate 3 of the vehicle body, with 5 guide wheels 18 installed at the inner and outer sides of the front and rear ends, and the guide wheels 18 are installed in an arc shape.

[0031] The edges of both sides of the sliding plate 17 are also arcs, and the sliding plate 17 is supported and guided by the V-shaped grooves in the inner and outer guide wheels 18, so that the sliding plate 17 can move along the distribution direction of the guide wheels 18. The sliding plate 17 is connected to the travel cylinder 19, and the extension and contraction of the cylinder can drive the sliding plate 17 to move forward and backward.

[0032] Two limit screws 16 are installed on each side of the sliding plate 17, and a fan-shaped hole is opened at the head and tail ends of the lower plate 3 of the vehicle body. When the travel cylinder 19 drives the sliding plate 17 to move until the limit screw 16 contacts the fan-shaped hole, the positioning assembly on the sliding plate 17 is just aligned with the center of the top cover light hole. At this time, the lifting cylinder 9 can extend the positioning block into the top cover light hole and complete the equipment positioning.

[0033] The proximity sensor 15 is installed on the lower plate 3 of the vehicle body. The proximity sensor 15 can sense the distance from the flange surface of the top cover. When the sensed distance changes, it means that the proximity sensor 15 moves to the edge of the top cover light hole, and the proximity sensor 15 can send a shear signal. The vehicle body can be preliminarily positioned through the signal shear of the proximity sensor 15.

[0034] like Figure 4 As shown, the camera assembly 2 includes an upper frame 20, a guide rod 21, a lower frame 22, a screw nut 23, a lifting motor 24, a large hollow turntable 25, a barrel 26, a rotating motor 27, a small hollow turntable 28 and a camera assembly 29. The upper frame 20 is fixedly connected to the lower frame 22, the guide rod 21 is installed in the upper frame 20, the lifting motor 24 is fixed to the bottom of the upper frame 20, the large hollow turntable 25 is fixed to the top of the lower frame 22, the lifting motor 24 and the large hollow turntable 25 are fixedly connected together, the screw nut 23 passes through the lifting large hollow turntable 25, and the large hollow turntable 25 is fixedly connected to the nut in the screw nut 23.

[0035] The lifting motor 24 drives the nut to rotate through the large hollow turntable 25, thereby driving the screw in the screw nut 23 to move up and down.

[0036] The lower end of the screw in the screw nut 23 is connected to a cylinder 26, in which a rotating motor 27 and a small hollow turntable 28 are installed. The small hollow turntable 28 is connected to a camera assembly 29. The rotating motor 27 can drive the camera assembly 29 to rotate through the small hollow turntable 28, and the camera in the camera assembly 29 shoots the main screw hole thread.

[0037] The specific workflow of the present invention is as follows:

[0038] After the equipment is hoisted onto the flange surface of the top cover, manual hoisting is performed to keep the three positioning components of the inspection instrument concentric with the threaded holes to be inspected. The lifting cylinder is activated and the positioning blocks of the three positioning components are extended into the holes to be positioned. After the proximity sensor 15 senses the signal shear, the initial positioning of the equipment is achieved.

[0039] After accurate positioning is achieved using the positioning assembly and the proximity sensor 15, the camera assembly 2 descends, and after the camera assembly 29 is in place, it rotates one circle to complete the video inspection of the bolt hole.

[0040] After the video inspection is completed, the camera assembly 2 rises and separates from the top cover flange surface.

[0041] The positioning block of the first positioning assembly 7 of the vehicle body rises, and the travel cylinder 19 drives the sliding plate 17 to move along the direction of the guide wheel 18. After traveling a threaded hole distance, the positioning block of the No. 1 positioning assembly 7 of the vehicle body descends and repositions. At this time, the inspection instrument body does not move.

[0042] The positioning block of the second positioning assembly 8 in the middle of the vehicle body rises.

[0043] The positioning block 11 of the third positioning assembly at the rear of the vehicle body is in a positioning state, and at the same time, the rear traveling cylinder is actuated to push the inspection instrument to move along the direction of the sliding plate, so that the inspection instrument travels a threaded hole distance.

[0044] The positioning block of the second positioning assembly 8 descends.

[0045] The positioning block of the third positioning assembly rises, and the tail walking cylinder contracts to drive the tail sliding plate forward. After advancing a threaded hole distance, the positioning block of the third positioning assembly descends and repositions.

[0046] The camera assembly 2 performs video inspection on the current threaded hole.

Claims

1. A pressure vessel bolt hole thread inspection device, characterized in that: It includes a vehicle body component and a camera component, wherein the vehicle body component and the camera component are connected via a connecting block and can be quickly assembled and disassembled; The vehicle body assembly includes a vehicle body lower plate, a support column, a vehicle body upper plate, a camera assembly connecting block, a first positioning assembly, a second positioning assembly, a second positioning block, a guide rod, a third positioning assembly, a first positioning block, a lifting cylinder, a travel wheel, a proximity sensor, a limit screw, two front and rear sliding plates, a guide wheel and a travel cylinder. The vehicle body lower plate and the vehicle body upper plate are connected to form a vehicle body structure through the support column, and a travel wheel is installed at the lower part of the vehicle body lower plate; The sliding plates are respectively provided with a positioning assembly, namely a first positioning assembly and a third positioning assembly, and the middle of the lower plate of the vehicle body is provided with a second positioning assembly; The first positioning assembly, the second positioning assembly and the third positioning assembly include a positioning block, a lifting cylinder and a guide rod; The two sides of the front and rear sliding plates are arc-shaped, and the sliding plates are supported and guided by the V-shaped grooves in the inner and outer guide wheels of the lower plate of the vehicle body, so that the sliding plates can move along the distribution direction of the guide wheels, and the front and rear sliding plates can slide forward and backward respectively under the drive of the travel cylinder; Two limit screws are installed on both sides of the sliding plate, and a fan-shaped hole is opened at the front and rear ends of the lower plate of the vehicle body. When the sliding plate is at the front and rear extreme positions, the positioning assembly on the sliding plate is aligned with the center of the light hole on the top cover; The lower end of the screw in the screw nut is connected to a cylinder, a rotating motor and a small hollow turntable are installed in the cylinder, the small hollow turntable is connected to the camera assembly, the rotating motor can drive the camera assembly to rotate through the small hollow turntable, and the camera in the camera assembly shoots the main screw hole thread; When the vehicle body moves on the flange surface of the top cover, the positioning block of the positioning assembly is inserted into the light hole of the top cover, and the equipment is driven forward and backward through the telescopic cooperation of the front and rear sliding plates. When the equipment is moving and working, it is ensured that at least two positioning blocks are inserted into the screw holes; The camera assembly includes an upper frame, a guide rod, a lower frame, a screw nut, a lifting motor, a large hollow turntable, a cylinder, a rotating motor, a small hollow turntable and a camera assembly. The upper frame is fixedly connected to the lower frame, a guide rod is installed in the upper frame, the lifting motor is fixed to the bottom of the upper frame, the large hollow turntable is fixed to the top of the lower frame, the lifting motor and the large hollow turntable are fixedly connected together, the screw nut passes through the large hollow turntable, the large hollow turntable is fixedly connected to the nut in the screw nut, and the lifting motor drives the nut to rotate through the large hollow turntable to drive the screw to move up and down.

2. A pressure vessel bolt hole thread inspection device as claimed in claim 1, characterized in that: The proximity sensor is installed on the lower plate of the vehicle body.

3. A pressure vessel bolt hole thread inspection device as claimed in claim 1, characterized in that: The vehicle body assembly and the camera assembly are fixed together by a camera assembly connecting block. When the equipment is stored and transported, the vehicle body assembly and the camera assembly can be quickly disassembled.

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