CN109192344B - Opening mechanism for detecting probe in long and narrow space - Google Patents

Abstract

The invention discloses an opening mechanism for a detection probe in a long and narrow space, which comprises a support part with an opening on the side wall, an opening mechanism installed in the support part, and an opening mechanism connected to the opening mechanism and capable of protruding from the opening. and retracted camera module. The opening mechanism includes a cylinder and a multi-link mechanism hinged to the support part, and the camera assembly is fixed on the multi-link mechanism. The invention can prevent the problem that the camera cannot be retracted due to the failure of the cylinder, etc., and improves the safety of the detection process; improves the detection reliability and safety of the guide card detection of the control rod guide cylinder of the nuclear power plant; adopts multiple support links to support the camera, and reduces the number of cameras. Shaking when opening; double-acting cylinder transmission, stable and convenient connection and control.

Description

Detection probe opening mechanism in narrow and long space

technical field

The invention relates to an opening mechanism for a detection probe in a long and narrow space.

Background technique

The control rod guide cylinder includes an upper guide cylinder and a lower guide cylinder. The guide cards and continuous guide components at all levels inside the guide cylinder provide guidance for the control rods. After a long time of operation, due to sliding friction and vibration, the guide The inner hole and contact belt of the card and continuous guide components are prone to wear and tear, which will cause the control rod to lose its guidance and cause the rod drop time to be out of tolerance, or even a rod jam event. Among the nuclear power units that have been in operation for more than 20 years in foreign countries, failures of reactor internal components have occurred in many units. In the pressurized water reactor nuclear power plant that has been in operation for nearly 30 years, the French nuclear power unit found that there was a lot of wear and tear on the control rod guide cylinder, and began to replace it on a large scale. Since 2010, the French Electricity Group (EDF) has replaced about 430 sets of control rods. Rod guide cylinder assembly. The United States lists the inspection of control rod guide cylinders as a mandatory inspection item for nuclear power unit life extension.

The U.S. invention patent with the patent number US005078955 discloses a control rod guide cylinder detection system, which is mainly a camera transmission device, including a motor, a screw rod, etc., and the extension and contact of the camera are realized through two reverse threads on the screw rod. However, there is the problem of inconvenient disassembly, which will bring inconvenience to the installation, commissioning and maintenance of the equipment, and will increase the time for the workers to be exposed to the radioactive environment; the use of screw transmission requires a longer screw rod, which makes the structure more complicated. Easy to install. Therefore, it is necessary to design a camera opening structure that is simple in structure and convenient for installation and disassembly.

Contents of the invention

The object of the present invention is to provide a detection probe opening mechanism in a narrow and long space with simple structure and easy installation and disassembly.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a detection probe opening mechanism in a long and narrow space, which includes a support part with an opening on the side wall, an opening mechanism installed in the support part, and an opening mechanism connected to the opening mechanism. The camera module on the top and can be stretched out and retracted from the opening, the support part includes a support tube at the top and a guide head at the bottom, the opening mechanism includes at least one set of upper ends hinged inside the support tube and The first connecting rod whose lower end is hinged with the camera module, the same group of the first connecting rods are arranged up and down, and the opening mechanism also includes the upper end and the first connecting rod respectively hinged with the middle part of the first connecting rod. Two connecting rods, a connecting plate for pushing the second two rods to move and bring the first connecting rod to extend or retract, and a cylinder for driving the connecting plate to move up and down, the lower end of the second connecting rod The part is hinged with the connecting plate.

Optimally, the first connecting rod has two groups and is respectively hinged to the two sides of the camera module.

Optimally, the connecting plate is L-shaped, the horizontal plate below it is fixedly connected to the piston rod of the cylinder, and the longitudinal plate above it is slidably connected in the support portion.

Further, the cylinder body of the air cylinder is located in the guide head, the piston rod of the air cylinder is located in the support cylinder, and a return tension spring is arranged between the transverse plate and the guide head.

Optimally, the side wall of the support cylinder is provided with an anti-foreign matter baffle.

Optimally, the opening mechanism further includes a camera mounting plate arranged between the first connecting rod and the camera module.

The beneficial effects of the present invention are: the present invention can avoid the occurrence of falling objects, prevent foreign matter from entering the control rod guide tube, and improve the safety margin; it can prevent the camera from being unable to be retracted due to the failure of the cylinder, etc., and improve the safety of the detection process Improve the reliability and safety of nuclear power plant control rod guide tube guide card detection detection; use multiple support links to support the camera, reduce the shaking of the camera when it is opened; use double-acting cylinder transmission, stable and convenient connection and control; The installation time of equipment during in-service inspection improves the efficiency of in-service inspection, thereby reducing the radiation dose received by personnel; when the cylinder fails, the camera module can be automatically retracted by gravity, and will not be stuck on the control rod guide card; it can be directly installed on the control rod The rod guide card is attached to the non-destructive testing device, which is easy to disassemble.

Description of drawings

Figure 1 shows the retracted state of the camera opening mechanism of the reactor control rod guide card non-destructive testing device

Figure 2 is the opening state of the camera opening mechanism of the reactor control rod guide card non-destructive testing device

Figure 3 is a schematic diagram of the longitudinal section of the camera opening mechanism of the reactor control rod guide card non-destructive testing device

In the figure: 1 support part, 1-1 support cylinder, 1-2 anti-foreign matter baffle, 1-3 guide head; 2 opening mechanism, 2-1 cantilever pin, 2-2 first connecting rod, 2-3 second Two connecting rods, 2-4 pin shafts, 2-5 camera mounting plates, 2-6 connecting plates, 2-7 double-acting cylinders; 3 camera modules.

Detailed ways

Below in conjunction with the embodiment shown in the accompanying drawings, the present invention is described in detail as follows:

As shown in Figure 1/2/3, the detection probe opening mechanism 2 in the narrow and long space includes a support part 1 with an opening on the side wall, an opening mechanism 2 installed in the support part 1, and an opening mechanism 2 connected to the opening mechanism 2. and a camera module 3 that can be stretched out and retracted from the opening,

The support part 1 includes a support cylinder 1-1 located above and a guide head 1-3 located below, and the opening mechanism 2 includes at least one set of upper ends hinged inside the support cylinder 1-1 and a lower end connected to the support cylinder 1-1. The first connecting rod 2-2 hinged with the camera module 3, the upper end and the second connecting rod 2-3 respectively hinged with the middle part of the first connecting rod 2-2, are used to push the second two The connecting plate 2-6 with the first connecting rod 2-2 stretched out or withdrawn by the rod action, the cylinder for driving the connecting plate 2-6 to move up and down and the first connecting rod 2-2 and the camera mounting plate 2-5 between the camera module 3. The first connecting rod 2-2 of the same group is set up and down, the first connecting rod 2-2 has two groups and is respectively hinged with the two sides of the camera module 3, and the second connecting rod 2-3 The lower end is hinged with the connecting plate 2-6. The connecting plate 2-6 is L-shaped, the horizontal plate below it is fixedly connected with the piston rod of the cylinder, and the longitudinal plate above it is slidably connected in the support part 1 up and down. The cylinder body of the air cylinder is located in the guide head 1-3, the piston rod of the air cylinder is located in the support cylinder 1-1, and a reset puller is provided between the transverse plate and the guide head 1-3. reed. The side wall of the support cylinder 1-1 is provided with an anti-foreign matter baffle 1-2.

The support part 1 is used to support the opening mechanism 2, and is composed of a support cylinder 1-1, an anti-foreign body baffle 1-2, and a guide head 1-3, and is connected to the control rod guide card non-destructive testing device for installing the opening mechanism 2. The anti-foreign matter baffle 1-2 is welded at the arm opening of the support tube 1-1 to prevent foreign matter from falling into the guide tube of the control rod; the guide head 1-3 is screwed to the bottom of the support tube 1-1 to open the mechanism for the camera 2 guide, and protect the double-acting cylinder 2-7 at the front end of the opening mechanism 2.

The opening mechanism 2 is used to stretch out the camera module 3, which consists of a cantilever pin shaft 2-42-1, a first connecting rod 2-2, a second connecting rod 2-3, a pin shaft 2-4, a camera mounting plate 2-5, Connecting plate 2-6, double-acting cylinder 2-7 form. The cantilever pin shaft 2-42-1 is fixed on the wall of the support cylinder 1-1; one end of the first connecting rod 2-2 is connected to the cantilever pin shaft 2-42-1, and the other end is connected to the camera through the pin shaft 2-4 On the mounting plate 2-5; one end of the second connecting rod 2-3 is connected to the middle part of the first connecting rod 2-2 through the pin shaft 2-4, and the other end is connected to the connecting plate 2-6 through the pin shaft 2-4; The plate 2-6 is L-shaped, one end of which is fixedly connected to the push rod of the double-acting cylinder 2-7; the double-acting cylinder 2-7 is fixed on the bottom section of the support tube 1-1, and is used to provide power for opening the camera module 3 .

The camera module 3 is used for video inspection of the control rod guide card, and is composed of a protective case, an end cover, a camera, a camera end cover, an LED light, a light-transmitting glass, and a retaining spring. The protective shell is fixed on the mounting plate of the camera module 3; the camera is fixed in the protective shell and sealed with the camera end cover; the LED light is fixed on the front of the camera to provide lighting for the video inspection of the control rod guide card; front end.

During detection, install the camera opening mechanism 2 of the non-destructive testing device for the reactor control rod guide card on the non-destructive testing device for the control rod guide card, drive the non-destructive testing device so that the opening mechanism 2 is placed above the tested guide card and make the camera module 3 open in the opposite direction. Go to the hole to be inspected, drive the double-acting cylinder 2-7 of the opening mechanism 2, and make the camera aim at the hole to be inspected to start detection. After inspecting one inspected hole, the non-destructive testing device rotates 90° to inspect another inspected hole until all four inspected holes are inspected. The double-acting cylinder 2-7 retracts, so that the opening mechanism 2 shrinks to the initial state, and the non-destructive testing device extends down to the next guide card to continue testing.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and not to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims (4)

1. An opening mechanism for a detection probe in a long and narrow space is characterized in that: the opening mechanism comprises at least one group of first connecting rods, wherein the upper end parts of the first connecting rods are hinged in the supporting cylinder, the lower end parts of the first connecting rods are hinged with the upper part and the lower part of the first connecting rods, the same group of first connecting rods are arranged in the upper part and the lower part, the opening mechanism also comprises second connecting rods, connecting plates and cylinders, the upper end parts of the second connecting rods are hinged with the middle parts of the first connecting rods, the connecting plates are used for pushing the second connecting rods to move and driving the first connecting rods to extend or retract, the cylinders are used for driving the connecting plates to move up and down, the lower end parts of the second connecting rods are hinged with the connecting plates, and cantilever pin shafts are fixed on the wall of the supporting cylinder; one end of the first connecting rod is connected to the cantilever pin shaft, and the other end of the first connecting rod is connected to the camera mounting plate through the pin shaft; one end of the second connecting rod is connected to the middle part of the first connecting rod through a pin shaft, the other end of the second connecting rod is connected to a connecting plate through a pin shaft, the connecting plate is L-shaped, a transverse plate below the connecting plate is fixedly connected with a piston rod of the air cylinder, and a longitudinal plate above the connecting plate is connected into the supporting part in a vertically sliding mode; the cylinder body of the cylinder is positioned in the guide head, the piston rod of the cylinder is positioned in the support cylinder, and a reset tension spring is arranged between the transverse plate and the guide head.

2. The opening mechanism of the inspection probe in the narrow and long space, according to claim 1, wherein: two groups of first connecting rods are hinged with two sides of the camera module respectively.

3. The opening mechanism of the inspection probe in the narrow and long space, according to claim 1, wherein: and the side wall of the supporting cylinder is provided with a foreign matter preventing baffle.

4. An opening mechanism for a test probe in an elongated space, according to claim 1, wherein: the opening mechanism further comprises a camera mounting plate arranged between the first connecting rod and the camera module.

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