CN105679385B - Transportable reaction core pressure vessel kingbolt hole video check instrument - Google Patents

Abstract

The invention discloses a portable video inspector for the main bolt hole of a reactor pressure vessel, which comprises: an imaging device, a driving device for driving the imaging device to move up and down and rotate in the bolt hole, and an image receiving device connected with the imaging device. The driving device of the portable reactor pressure vessel main bolt hole video inspector of the present invention drives the camera device to rotate and rise or fall in the threaded hole, which can ensure that the obtained thread image information is complete and continuous, and the whole picture is uniform and stable.

Description

Portable Reactor Pressure Vessel Main Bolt Hole Video Inspector

technical field

The invention belongs to the technical field of nuclear power. More specifically, the invention relates to a portable reactor pressure vessel main bolt hole video inspector suitable for inspecting the thread surface condition.

Background technique

The operating pressure of the CPR1000 nuclear power plant reactor pressure vessel is 15.5MPa. It consists of two parts, the cylinder and the top cover. The cylinder and the top cover are connected and fastened by 58 M155×4 main bolts. When the main bolt is screwed into the main bolt hole, the threaded surface of the main bolt hole must be very clean, without any burrs and foreign objects on the surface, so as to ensure that the main bolt does not get stuck. Therefore, before installing the connection, the threaded surface in the main bolt hole must be checked to confirm whether it meets the installation standard.

At present, the condition of the threaded surface is obtained by taking pictures or videos of the bolt holes with a hand-held ordinary video recording device. However, due to the narrow space inside the main bolt hole, the recording work is carried out outside the bolt hole, and it is impossible to obtain a complete and continuous thread image by taking pictures, which is not conducive to surface condition inspection and record archiving. At the same time, due to space constraints, personnel cannot observe during recording to the viewfinder. In addition, due to the unstable hand-holding, the picture cannot be guaranteed to be stable when recording.

In view of this, it is indeed necessary to provide a portable reactor pressure vessel main bolt hole video inspection instrument, which can follow the thread to shoot, form a complete and continuous record, and can archive the inspection results as required.

Contents of the invention

The object of the present invention is to provide a portable reactor pressure vessel main bolt hole video inspection instrument, which can follow the screw thread to take pictures, form a complete and continuous record, and can archive the inspection results as required.

In order to achieve the above-mentioned purpose of the invention, the present invention provides a portable reactor pressure vessel main bolt hole video inspection instrument, which includes: an imaging device, a driving device for driving the imaging device to move up and down and rotate in the bolt hole, and the imaging device and the imaging device connected image receiver.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the driving device of the portable bolt hole video inspector includes a screw that can move up, down and rotate relative to the bolt hole, and the camera is connected to the screw.

As an improvement of the portable reactor pressure vessel main bolt hole video inspection instrument of the present invention, the driving device of the portable reactor pressure vessel main bolt hole video inspection instrument includes a lead screw, a nut, a support bowl, a motor, and a lifting plate, and the lifting plate is arranged on the support Above the bowl, the motor is set on the lifting plate, the nut is set on the center through hole of the support bowl, the lead screw passes through the support bowl through the nut, the upper end of the lead screw is connected with the output shaft of the motor, and the lower end of the lead screw is connected with the camera device connect.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the lead of the lead screw is the same as the thread lead of the bolt hole.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the outer diameter of the support bowl is the same as the inner diameter of the light hole of the bolt hole.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the supporting bowl is made of nylon plastic.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the driving device of the portable reactor pressure vessel main bolt hole video inspector also includes a remote controller and two wireless relays, the wireless relay is arranged on the lifting plate, and the motor The terminals of the two wireless relays are connected to the common terminals of the two wireless relays respectively.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the driving device of the portable reactor pressure vessel main bolt hole video inspector also includes at least two linear guide rails, which are symmetrically arranged on the support bowl and connected with Lifting plate sliding connection.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the camera device of the portable reactor pressure vessel main bolt hole video inspector is a wireless transmission camera, and the image receiving device is a wireless camera viewer.

As an improvement of the portable reactor pressure vessel main bolt hole video inspector of the present invention, the driving device of the portable reactor pressure vessel main bolt hole video inspector includes a rotary push rod, a micro motor and a micro cylinder, and the lower end of the rotary push rod is connected to the The camera device is connected, the upper end of the rotary push rod is connected with the output shaft of the micro motor, and the micro motor is connected with the piston rod of the micro cylinder.

Compared with the prior art, the driving device of the portable reactor pressure vessel main bolt hole video inspector of the present invention drives the camera device to rotate and rise or fall in the threaded hole, so as to ensure that the acquired thread image information is complete and continuous, and the whole picture is uniform and stable .

Description of drawings

The structure and technical effects of the portable reactor pressure vessel main bolt hole video inspector of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of a portable reactor pressure vessel main bolt hole video inspector of the present invention.

Fig. 2 is a working principle block diagram of the portable reactor pressure vessel main bolt hole video inspector of the present invention.

Fig. 3 is a schematic diagram of the field of view coverage of the camera device of the portable reactor pressure vessel main bolt hole video inspector of the present invention.

detailed description

In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

Referring to Fig. 1, the portable reactor pressure vessel main bolt hole video inspector of the present invention includes: a camera, a driving device that drives the camera to move and rotate up and down in the bolt hole, and an image receiving device connected with the camera.

The camera device is a wireless transmission camera 5 (also can be other video recording equipment, such as a miniature camera, etc.), which can prevent signal wires from being entwined when rotating, and the image receiving device is a wireless camera viewer 10 (also can be other image processing equipment such as a mobile phone with video reception function, etc.).

The driving device includes a lead screw 6, a nut 7, a linear guide rail 1, a supporting bowl 4, a motor 9, and a lifting plate 3. The lifting plate 3 is arranged above the supporting bowl 4, the motor 9 is arranged on the lifting plate 3, and the nut 7 is arranged on the supporting plate. On the central through hole of bowl 4, lead screw 6 passes through support bowl 4 through nut 7, and the upper end of lead screw 6 is connected with the output shaft transmission of motor 9, and the lower end of lead screw 6 is connected with wireless transmission camera 5 through connection bracket, three The linear guide rail 1 is symmetrically arranged on the support bowl and is slidably connected with the lifting plate 3 through the bearing 2, so as to further keep the lifting plate 3 stable in the process of rising or falling.

The motor 9 drives the lead screw 6 to rotate, and the lead screw 6 rotates to drive the lifting plate 3 to rise or fall, thus forming the action of the lead screw 6 rotating and lifting, wherein the material of the lift plate 3 and the supporting bowl 4 is PA6 nylon plastic , the support bowl 4 that contacts with bolt hole adopts nylon plastic to make and has played buffering effect to shock absorption. The outer diameter of the support bowl 4 is the same as the inner diameter of the light hole of the bolt hole, which ensures that the wireless transmission camera 5 is located at the center of the bolt hole. The linear guide rail 1 adopts a chrome-plated hard shaft, and the end is threaded to be installed on the support bowl 4. Lead screw 6 selects and adopts ball screw, and its lead is identical with the screw thread of bolt hole, has guaranteed that wireless transmission camera 5 follows screw thread and descends synchronously. Motor 9 is a 12V/1A DC motor, equipped with a worm gear reducer, with a maximum torque of 0.5N·m, and bearing 2 is a flangeless linear bearing.

In addition, for more convenient operation, a remote controller (not shown) is provided to control the forward rotation and reverse rotation of the motor 9. Specifically, two wireless relays 8 are set on the lifting plate 3, and the terminals of the motor 9 are respectively connected to two The common end of the wireless relay 8 realizes the positive and negative connection of the motor terminals by the interlock setting of the relay. In this embodiment, the minimum allowable torque of the driving device is M, the nominal diameter of the screw is d, the lift angle is α, the total weight of the lifting plate is G, μ is the friction coefficient between the ball and the screw, and the force balance relationship inferred:

G sinα+(F sinα+G cosα)μ＝F cosα (1)

M＝F·0.5d (2)

From formula (1), (2) get

Among them, G=5N, d=16mm, μ=0.01 and because tanα=4/dπ=0.08, sinα=0.079, cosα=0.997

M＝0.0036N·m＜0.5N·m

Please refer to Fig. 2, the working principle of the present invention is as follows: the remote controller sends a signal, and the wireless relay receives the signal to realize the forward rotation or reverse rotation of the motor 9, and the motor 9 drives the screw 6 to rotate and descend or rise along the inside of the threaded hole, and the wireless transmission camera 5. The captured image signal can be transmitted to the wireless camera viewer 10 for viewing and recording.

Please refer to Figure 3 to calculate and analyze the coverage of the camera field of view: above the main threaded hole, there is , 20mm deep stepped hole, the nominal diameter of the threaded hole of the main bolt , pitch 4mm. The black circle represents the camera, h is the descending distance of the screw after rotating 360°, which is the lead of the screw, and L is half of the nominal diameter of the thread. It is necessary to ensure that after the camera descends h, the uppermost range of the viewing angle must touch the lowermost range before the descent, so as to ensure that there is no dead angle in the observation. It is easy to see that the larger the viewing angle and the smaller the lead, the greater the coverage. For example, if the viewing angle of the camera is 30°, as shown in Figure 3, it is a critical state where there is no dead angle, and the obtained h is h _max . The figure shows

L=155/2=77.5, tan30°=0.577; get h=89.5

That is, the maximum lead of the screw is 89.5mm.

Given that the pitch of the main threaded hole is 4mm, it is more advantageous to choose a screw pair with a lead of 4mm, which can follow the main thread to descend.

Screw pair: SFU1604-3 nominal diameter 16mm, lead 4mm, nut diameter 28mm.

According to the above selection, 89/4≈22 threads will appear in the field of view of the camera, and the field of view will drop by one thread every time the screw rotates.

The portable reactor pressure vessel main bolt hole video inspector of the present invention is applied to the bolt holes of the M155×4 main bolts of the CPR1000 nuclear power plant reactor pressure vessel to carry out the process of surface condition inspection (also can be applied to the bolt holes of other equipment): ( 1) Place the portable reactor pressure vessel main bolt hole video inspection instrument above the light hole of the pressure vessel main bolt hole, and turn on the power; (2) Open the wireless camera viewer, and select the channel to receive the wireless transmission camera signal; ( 3) Press the reverse button of the remote control, the wireless camera starts to rotate counterclockwise until the camera reaches the initial thread at the top; (4) Press the forward button of the remote control, the camera starts to rotate clockwise until the camera reaches the bottom (5) If you need to save the image during the inspection, press the storage button on the viewer to save the image or video to the SD card of the viewer.

The portable reactor pressure vessel main bolt hole video inspector of the present invention uses a motor to drive the camera to rotate, and follows the thread of the bolt hole along the track formed by the threaded screw pair to rotate and descend synchronously, which can ensure that the acquired thread image information is complete and continuous. The picture is uniform and stable. The wireless operation module and the bluetooth transmission technology make the operation of the present invention more automatic and more convenient to use.

It can be understood that, in other embodiments, the driving device of the portable reactor pressure vessel main bolt hole video inspector of the present invention includes a rotary push rod, a micro motor and a micro cylinder, the lower end of the rotary push rod is connected with the camera device, and the rotary push rod The upper end of the rod is connected with the output shaft of the micro motor, the micro motor is fixed on the motor seat, and the motor seat is connected with the piston rod of the micro cylinder. The forward and backward movement of the piston rod of the miniature cylinder can promote the motor, the rotary push rod and the camera device to move up and down in the threaded hole, and the rotation of the output shaft of the motor makes the rotary push rod and the camera device rotate in the threaded hole, which can also realize the invention. Purpose.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present invention pertains can also make appropriate changes and modifications to the above embodiment. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims (7)

1. A portable reactor pressure vessel main bolt hole video inspector, is characterized in that, comprises: camera device, driving device that drives camera device to move up and down and rotates in bolt hole, and the image receiving device that is connected with camera device The driving device includes a lead screw, a nut, a supporting bowl, a motor, and a lifting plate, the lifting plate is arranged above the supporting bowl, the motor is arranged on the lifting plate, the nut is arranged on the central through hole of the supporting bowl, and the leading screw passes through the nut Through the supporting bowl, the upper end of the leading screw is connected with the output shaft of the motor so as to be able to move up and down and rotate relative to the bolt hole, and the lower end of the leading screw is connected with the camera device. 2. The portable reactor pressure vessel main bolt hole video inspector according to claim 1, characterized in that the lead of the screw is the same as the thread lead of the bolt hole. 3. The portable reactor pressure vessel main bolt hole video inspector according to claim 1, wherein the outer diameter of the support bowl is the same as the inner diameter of the light hole of the bolt hole. 4. The portable reactor pressure vessel main bolt hole video inspector according to claim 1, characterized in that, the material of the support bowl is nylon plastic. 5. The portable reactor pressure vessel main bolt hole video inspection instrument according to claim 1, wherein the drive device also includes a remote controller and two wireless relays, the wireless relays are arranged on the lifting plate, and the The terminals of the motor are respectively connected to the common terminals of the two wireless mode relays. 6. The portable reactor pressure vessel main bolt hole video inspection instrument according to claim 1, characterized in that, the drive device also includes at least two linear guide rails, the linear guide rails are symmetrically arranged on the support bowl and connected to the The lifting plate is slidingly connected. 7. The portable reactor pressure vessel main bolt hole video inspector according to claim 1, wherein the camera device is a wireless transmission camera, and the image receiving device is a wireless camera viewer.