Tools and methods for verifying the correctness of pile top cable connection

Abstract

The present invention belongs to the technical field of cable connection verification on the top of a pile, and specifically relates to a tool and method for verifying the correctness of the cable connection on the top of a pile, the tool comprising a box body, a piece row column, a wire take-up box, a controller, an electric heating plate, a control switch, a parallel switch, a wire take-up roller, a clockwork spring and a conducting wire, the parallel switch and the piece row column are fixedly installed on the bottom surface of the box body, a plurality of electric heating plates are arranged and clamped on the outside of the piece row column, a groove is provided in the middle of the left side surface of the box body adjacent to the parallel switch, a control switch corresponding to the groove is fixedly installed on the end of the parallel switch adjacent to the left side surface of the box body, a controller and a wire take-up box are installed on the top of the parallel switch, one side of the controller is fixedly connected to the left side surface of the box body, and the other side is fixedly connected to the wire take-up box, the wire take-up box is evenly divided into winding spaces, a wire take-up roller is rotatably installed in each winding space, the upper and lower ends of the wire take-up roller are elastically connected to the wire take-up box, a conducting wire is wound on the outside, and one end of the conducting wire is correspondingly connected to the electric heating plate.

Description

Technical Field

[0001] The invention belongs to the technical field of pile top cable connection verification, and in particular relates to a pile top cable connection correctness verification tool and method. Background Art

[0002] The reactor core nuclear measurement system is used for monitoring the local linear power density of the reactor core and the core power field distribution. The nuclear core measurement system of some nuclear power plants involves the protection of the reactor. When the parameters exceed the allowable value, a protection signal will be generated and sent to the reactor protection system. It plays a very important role in the instrumentation and control system of the nuclear power plant.

[0003] The core nuclear measurement system uses advanced self-powered detectors installed in the reactor core. Some nuclear power plants use more advanced neutron temperature measurement channels (NTMCs) to measure reactor core parameters. The neutron temperature measurement channel is installed in the core fuel assembly and includes 7 self-powered detectors, several thermocouple thermometers and a compensated thermal resistance thermometer. It can not only measure the core neutron flux, but also measure the coolant temperature at the core inlet and outlet.

[0004] During the refueling overhaul of a nuclear power unit, the core refueling operation can only be carried out after the connection between the NTMC installed under the core and the top cable is released and the top cable and NTMC are removed from the reactor pit. The connection between the NTMC and the top cable can be restored only after the new fuel is in place.

[0005] Each NTMC corresponds to a top cable. Due to the harsh working environment, it is easy to cause the NTMC and the top cable to be connected in reverse during the connection process. In fact, after the NTMC and the top cable are connected, it is impossible to judge whether the connection is correct through the monitoring signal. Only after the unit power is increased to 30% of the rated power can the cable connection be judged correctly through the monitoring parameters. Once the NTMC and the top cable are connected in reverse, the core monitoring parameters will be unreliable, which will seriously threaten the normal operation of the reactor and may even cause the reactor to shut down for emergency protection. Only by withdrawing the unit state and putting the reactor in a cold shutdown state can the reconnection be corrected, which will cause great economic losses.

[0006] Based on the above situation, measures must be taken. At present, electric heating plates are used to closely fit the detector end for compensatory heating. The corresponding compensating thermal resistor signals are monitored on the cabinet side of the electronic equipment room to verify whether the connection is correct. Since NTMC has many connections with the top cable of the stack, multiple electric heating plates need to be used at the same time, causing line confusion, affecting operation and use, and even causing damage to the original equipment.

[0007] Based on this, it is urgent to develop a verification tool that is easy to use and can promptly reflect whether the top cable connection is correct or not. Summary of the invention

[0008] The purpose of the present invention is to provide a tool and method for verifying the correctness of the stack top cable connection, which can effectively avoid line confusion, improve ease of use, and promptly detect and correct incorrect stack top cable connections, thereby effectively ensuring the correctness of monitoring parameters.

[0009] A technical solution to achieve the purpose of the present invention: a tool for verifying the correctness of the cable connection on the top of a pile, the verification tool comprising a box, a row of pieces, a take-up box, a controller, an electric heating plate, a control switch, a parallel switch, a take-up roller, a spring and a conductor, a parallel switch is fixedly installed on the left side of the bottom surface of the box, a plurality of row of pieces are fixedly installed on the right side of the bottom surface of the box, a plurality of electric heating plates are arranged on the outside of the row of pieces, a groove is provided in the middle of the left side surface of the box adjacent to the parallel switch, a control switch corresponding to the groove is fixedly installed at the end of the parallel switch adjacent to the left side surface of the box, and A controller and a wire-taking box are installed on the top of the parallel switch, one side of the controller is fixedly connected to the left side of the box, and the other side of the controller is fixedly connected to the wire-taking box. The wire-taking box is evenly divided into a number of winding spaces, and a wire-taking roller is rotatably installed in each winding space. The upper and lower ends of the wire-taking roller are elastically connected to the wire-taking box through a spring spring, and a wire is wound on the outside of the wire-taking roller. One end of the wire passes through the wire-taking box and is connected to the electric heating plate accordingly, and the other end of the wire is electrically connected to one end of the parallel switch, the other end of the parallel switch is electrically connected to one end of the controller, and the other end of the controller is electrically connected to the control switch.

[0010] The verification tool also includes a nut, an upper extension end of the take-up roller passes through the take-up box, and the nut is meshed and connected with the upper extension end of the take-up roller.

[0011] Twist handles are symmetrically fixed on both sides of the nut.

[0012] The side of the wire receiving box facing the row column is located at the wire passing-out position and is symmetrically rotatably equipped with two guide wheels, and the wire passes through between the two guide wheels.

[0013] The number of winding spaces separated by the winding box is the same as the number of row columns.

[0014] The middle part of the cross section of the row column is in a fracture shape.

[0015] The diameter of the row column is smaller than the diameter of the electric heating plate.

[0016] The electric heating plate is ring-shaped.

[0017] A method for verifying the correctness of a stack top cable connection, the method comprising the following steps:

[0018] Step 1: Remove the electric heating plate from the row column;

[0019] Step 2: Pull out the wire from the take-up roller, place the electric heating plate on the height position of the compensation thermal resistor of NTMC, and determine the length of the wire;

[0020] Step 3: Squeeze the nut against the top of the wire box to determine the length of the wire;

[0021] Step 4, turn on the control switch to supply power to the electric heating plate to heat the compensation thermal resistor;

[0022] Step 5: The upper system server that monitors the core neutron flux monitors the corresponding compensation thermal resistor temperature signal to determine the correctness of the top cable connection.

[0023] In the step 2, the wire is pulled out from the wire take-up roller. Specifically, the wire take-up roller overcomes the elastic force of the spring spring and rotates in the wire take-up box, thereby pulling out the wire from the wire take-up roller.

[0024] In the step 3, squeezing the nut and the top of the take-up box is specifically squeezing the nut and the top of the take-up box by meshing the nut with the upper extension end of the take-up roller.

[0025] The beneficial technical effects of the present invention are:

[0026] (1) A stack top cable connection correctness verification tool of the present invention neatly groups and stores the electric heating sheets into one, and cooperates with the elastic winding function of the take-up roller to facilitate the neat stretching and use of the electric heating sheets, avoids the confusion of the lines, and improves the convenience of use;

[0027] (2) The method for verifying the correctness of the stack top cable connection of the present invention can detect in advance the incorrect connection between the NTMC and the stack top cable after verification, and correct it in time, thereby effectively ensuring the correctness of the NTMC monitoring parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a tool for verifying the correctness of a stack top cable connection provided by the present invention;

[0029] Figure 2 A stack top cable connection correctness verification tool provided by the present invention includes a structural schematic diagram of a control switch;

[0030] Figure 3 A schematic cross-sectional view of a stack top cable connection correctness verification tool provided by the present invention;

[0031] Figure 4 The present invention provides a schematic diagram of the connection structure of an electric heating plate in a tool for verifying the correctness of a stack top cable connection.

[0032] In the figure: 1. Box body; 2. Row column; 3. Wire taking-up box; 4. Controller; 5. Electric heating plate; 6. Control switch; 7. Parallel switch; 8. Wire taking-up roller; 9. Nut; 10. Spring; 11. Guide wheel; 12. Wire. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0034] like Figure 1-3 As shown, a tool for verifying the correctness of the top pile cable connection of the present invention comprises a box body 1, a row column 2, a take-up box 3, a controller 4, an electric heating plate 5, a control switch 6, a parallel switch 7, a take-up roller 8, a nut 9, a clockwork spring 10, a guide wheel 11 and a conductor 12.

[0035] like Figure 1-3 As shown, a parallel switch 7 is fixedly installed on the left side of the inner bottom surface of the box body 1, six arrangement columns 2 are fixedly installed on the right side of the inner bottom surface of the box body 1, and four annular electric heating plates 5 are arranged and clamped on the outer side of the arrangement columns 2. A groove is opened in the middle of the left side surface of the box body 1 adjacent to the parallel switch 7, and a control switch 6 corresponding to the groove is fixedly installed at the end of the parallel switch 7 adjacent to the left side surface of the box body 1. A controller 4 and a wire receiving box 3 are installed on the top of the parallel switch 7, one side of the controller 4 is fixedly connected to the left side surface of the box body 1, and the other side of the controller 4 is fixedly connected to the wire receiving box 3.

[0036] like Figure 3 As shown, the wire taking-up box 3 is evenly divided into 6 winding spaces, and a wire taking-up roller 8 is rotatably installed in each winding space in the wire taking-up box 3. The upper and lower ends of the wire taking-up roller 8 are elastically connected to the wire taking-up box 3 through a clockwork spring 10. The upper end of the wire taking-up roller 8 extends out of the wire taking-up box 3 and is meshed with a nut 9. Inclined twist handles are symmetrically fixed on both sides of the nut 9 for twisting the nut 9.

[0037] Two guide wheels 11 are symmetrically installed on the side of each winding space of the wire taking-up box 3 facing the arrangement column 2, and a conducting wire 12 is wound on the outer side of the wire taking-up roller 8. One end of the conducting wire 12 passes through the wire taking-up box 3 and is correspondingly connected to the electric heating plate 5. The position where the conducting wire 12 passes through the wire taking-up box 3 corresponds to the position of the guide wheel 11. The conducting wire 12 passes between the two guide wheels 11 to ensure stable movement of the conducting wire 12. The other end of the conducting wire 12 is electrically connected to one end of the parallel switch 7, the other end of the parallel switch 7 is electrically connected to one end of the controller 4, and the other end of the controller 4 is electrically connected to the control switch 6.

[0038] like Figure 2-3As shown, by electrically connecting the control switch 6 to the controller 4, electrically connecting the controller 4 to the parallel switch 7, electrically connecting the parallel switch 7 to the wire 12, and electrically connecting the wire 12 to the electric heating plate 5, the control switch 6 controls the heating of the electric heating plate 5, and each control switch 6 corresponds to an electric heating plate 5 connected to the parallel wire.

[0039] like Figure 1-2 As shown, the middle part of the cross section of the row column 2 is in a fracture shape, which is convenient for removing the electric heating plate 5 from the outside of the row column 2.

[0040] like Figure 1-2 As shown, the diameter of the arrangement column 2 is smaller than the diameter of the electric heating plate 5, so as to prevent the arrangement column 2 from affecting the elastic contraction of the electric heating plate 5 when the electric heating plate 5 is clamped, thereby preventing the electric heating plate 5 from being unstable during normal use.

[0041] like Figure 4 As shown, the tapping parts of the wires 12 connected to the electric heating plate 5 are all fixedly wrapped with insulating glue to increase the connection strength of the parallel wires 12.

[0042] like Figure 1-3 As shown, a method for verifying the correctness of a stack top cable connection of the present invention comprises the following steps:

[0043] Step 1: Remove the electric heating plate 5 from the row column 2

[0044] According to the number of NTMCs connected to the top cables of the pile, remove the corresponding number of electric heating plates 5 from the row column 2;

[0045] Step 2: Pull out the wire 12 from the take-up roller 8, place the electric heating plate 5 on the height position of the compensation thermal resistor of the NTMC, and determine the length of the wire 12.

[0046] The wire 12 passes through each winding space of the take-up box 3 and is pulled outward by the guide wheel 11 installed on the side of the row column 2, driving the take-up roller 8 to overcome the elastic force of the spring 10 and rotate in the take-up box 3, and then the wire 12 is pulled out from the take-up roller 8. After the NTMC is connected to the top cable of the pile, the parallel electric heating plate 5 is immediately placed on the height position of the compensation thermal resistor of the NTMC to determine the length of the wire 12;

[0047] Step 3: Squeeze the nut 9 against the top of the wire box 3 to determine the length of the wire 12.

[0048] After determining the length of the conductor 12, the nut 9 is twisted by the twist handles on both sides of the nut 9, and the nut 9 is meshed and connected with the upper extension end of the take-up roller 8, and the nut 9 is squeezed against the top of the take-up box 3, so that the take-up roller 8 stops rotating in the take-up box 3, and the length of the conductor 12 is positioned;

[0049] Step 4: Turn on the control switch 6 to supply power to the electric heating plate 5 so that the compensation thermal resistor heats

[0050] The controller 4 is electrically connected to an external power supply, and the control switch 6 corresponding to the electric heating sheet 5 placed at the height position of the compensation thermal resistor of the NTMC is turned on. Through the electrical connection between the control switch 6 and the controller 4, the electrical connection between the controller 4 and the parallel switch 7, the electrical connection between the parallel switch 7 and the wire 12, and the electrical connection between the wire 12 and the electric heating sheet 5, the electric heating sheet 5 is powered, so that the compensation thermal resistor attached to the electric heating sheet 5 is heated;

[0051] Step 5: The upper system server that monitors the core neutron flux monitors the corresponding compensation thermal resistor temperature signal to determine the correctness of the top cable connection.

[0052] During actual on-site operation, the compensation thermal resistors on the three detectors on the same column of the neutron temperature measurement channel are marked as 1, 2, and 3, and the compensation thermal resistors are heated in sequence from 1 to 3;

[0053] The upper system server that monitors the neutron flux in the core monitors the temperature change sequence of the compensating thermistors on the three detectors of the neutron temperature measurement channel in the same column, and compares the temperature change sequence of the compensating thermistors monitored by the upper system server with the heating sequence during actual on-site operation. If they are the same, it indicates that the top cable connection is correct. If they are different, it indicates that the top cable connection is incorrect.

[0054] Therefore, the verification method of the present invention can timely discover the incorrect connection between the NTMC and the stack top cable after verification, and make corrections, thereby effectively ensuring the correctness of the NTMC monitoring parameters.

[0055] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. A tool for verifying the correctness of the top-of-stack cable connection, characterized in that: The verification tool comprises a box (1), a row column (2), a take-up box (3), a controller (4), an electric heating plate (5), a control switch (6), a parallel switch (7), a take-up roller (8), a spring spring (10) and a conductor (12); a parallel switch (7) is fixedly installed on the left side of the bottom surface of the box (1); a plurality of row columns (2) are fixedly installed on the right side of the bottom surface of the box (1); a plurality of electric heating plates (5) are arranged and clamped on the outside of the row columns (2); a groove is provided in the middle of the left side surface of the box (1) adjacent to the parallel switch (7); a control switch (6) corresponding to the groove is fixedly installed at the end of the parallel switch (7) adjacent to the left side surface of the box (1); and a controller (4) and a wire (12) are installed on the top of the parallel switch (7). A wire take-up box (3), one side of a controller (4) is fixedly connected to the left side of the box body (1), and the other side of the controller (4) is fixedly connected to the wire take-up box (3). The wire take-up box (3) is evenly divided into a plurality of winding spaces, and a wire take-up roller (8) is rotatably installed in each winding space. The upper and lower ends of the wire take-up roller (8) are elastically connected to the wire take-up box (3) through a spring (10). A wire (12) is wound on the outer side of the wire take-up roller (8), and one end of the wire (12) passes through the wire take-up box (3) and is correspondingly connected to the electric heating plate (5). The other end of the wire (12) is electrically connected to one end of a parallel switch (7), and the other end of the parallel switch (7) is electrically connected to one end of the controller (4), and the other end of the controller (4) is electrically connected to the control switch (6).

2. A stack top cable connection correctness verification tool according to claim 1, characterized in that: The verification tool also includes a nut (9), the upper extension end of the take-up roller (8) passes through the take-up box (3), and the nut (9) is meshedly connected with the upper extension end of the take-up roller (8).

3. A stack top cable connection correctness verification tool according to claim 2, characterized in that: Twist handles are symmetrically fixed on both sides of the nut (9).

4. A stack top cable connection correctness verification tool according to claim 1, characterized in that: Two guide wheels (11) are symmetrically mounted on the side of the wire receiving box (3) facing the row column (2) at the position where the wire (12) passes through, and the wire (12) passes through between the two guide wheels (11).

5. A stack top cable connection correctness verification tool according to claim 1, characterized in that: The number of winding spaces separated by the winding box (3) is the same as the number of row columns (2).

6. A stack top cable connection correctness verification tool according to claim 1, characterized in that: The middle part of the cross section of the row column (2) is in a fracture shape.

7. A stack top cable connection correctness verification tool according to claim 1, characterized in that: The diameter of the row column (2) is smaller than the diameter of the electric heating plate (5).

8. A stack top cable connection correctness verification tool according to claim 1, characterized in that: The electric heating plate (5) is ring-shaped.

9. A method for verifying the correctness of a stack top cable connection, using a stack top cable connection correctness verification tool according to claim 1, characterized in that: The method comprises the following steps: Step 1, remove the electric heating plate (5) from the row column (2); Step 2, pull out the wire (12) from the take-up roller (8), place the electric heating plate (5) on the height position of the compensation thermal resistor of the NTMC, and determine the length of the wire (12); Step 3, squeeze the nut (9) and the top of the wire box (3) to determine the length of the wire (12); Step 4, turning on the control switch (6) to supply power to the electric heating plate (5) so that the compensating thermal resistor is heated; Step 5: The upper system server that monitors the core neutron flux monitors the corresponding compensation thermal resistor temperature signal to determine the correctness of the top cable connection.

10. A method for verifying correctness of top-of-stack cable connection according to claim 9, characterized in that: In step 2, pulling out the wire (12) from the wire take-up roller (8) specifically involves the wire take-up roller (8) overcoming the elastic force of the spring spring (10) and rotating in the wire take-up box (3), thereby pulling out the wire (12) from the wire take-up roller (8).

11. A method for verifying correctness of top-of-stack cable connection according to claim 9, characterized in that: In the step 3, the nut (9) is squeezed with the top of the take-up box (3) by meshing the nut (9) with the upper extension end of the take-up roller (8) to squeeze the nut (9) with the top of the take-up box (3).

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