JPH0540475Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is designed to guide a traveling type detector that measures the three-dimensional power distribution inside the reactor to a selected passage in the reactor core. This invention relates to a path selection device that performs switching.

[Conventional technology]

FIG. 3 is a schematic configuration diagram showing the circuit configuration of a conventional passage selection device, in which 1 is a passage selection mechanism, 2 is a motor that drives the movable part of this passage selection mechanism, and 3 is a motor that drives the movable part of the passage selection mechanism. A limit switch that operates (switches from the NC side to the NO side) when the limit switch reaches a predetermined position; 4 is a motor drive means for applying driving power to the motor 2; 5 indicates the operating state of the limit switch 3 by lighting a lamp 5a; A display means for displaying, 6 a selection command switch for designating a passage, and 7 a signal power source. 4 is a front view showing the configuration of the passage selection mechanism 1, FIG. 5 is a side view taken along the negative cross section of FIG. 4, and FIG. 6 is a side view taken along the negative cross section of FIG. 4. 4 to 6, 11 to 13 are tubular passages through which a detector (not shown) for measuring the output inside the reactor passes, and 11 is an inlet side through which the detector is inserted into the passage selection mechanism 1. Five passages 12 are arranged on the circumference as shown in FIG. 6, and exit side passages are fixed to the outer frame (not shown) of the passage selection mechanism 1, and 13 is a movable passage of the passage selection mechanism 1, which will be described later. This is a movable part passageway attached to the part. 14 is a movable part to which rotational driving force of the motor 2 is applied via a gear 15; 16 is a shaft 17;
It is a disc that is connected to the movable part 14 and rotates together with the movable part 14, and is provided with a pawl 18 so that the limit switch 3 is activated when the movable part passage 13 reaches the position of the outlet side passage 12. The limit switch 3 is attached to the outer frame (not shown) of the passage selection mechanism, and as shown in FIG.
, and is arranged at a position facing the outlet side passage 12.

Next, the operation will be explained. As an example, the symbol N
A case will be described in which a path N is selected from a state where no path is selected. First, set the selection command switch 6 to the N position. In this state, the N limit switch 3 is on the NC side (inactive), and the signal from the power source 7 is given to the motor drive means 4 via the N limit switch 3, causing the motor 2 to rotate and The movable part 14 of the selection mechanism 1 rotates. When the movable part passage 13 attached to the movable part 14 comes to the position of the N outlet passage 12, the N limit switch 3 is activated by the claw 18.
is activated and switches from the NC side to the NO side. Therefore, the signal from the power supply 7 that was being applied to the motor driving means 4 is no longer applied to the motor driving means 4, and the motor 2 is stopped. At this time, the signal from the power source 7 is supplied to the display means 5, and the N lamp 5a of the display means 5 lights up. As described above, by setting the selection command switch 6 to a position corresponding to a desired passage, the set passage can be selected.

[Problem that the invention attempts to solve]

Since the conventional passage selection device is constructed as described above, the position of the selection command switch 6 and the lighting of the lamp 5a of the display means 5 are always in one-to-one correspondence, and the state where no selection operation is performed ( For example, when the entire device is turned on and the selection command switch 6 in Figure 3 is set to the blank position)
However, there was a problem in that it was not possible to check the condition of the passage.

This invention was made in order to solve the above-mentioned problems, and aims to provide a passage selection device that displays the status of the passage even when no passage selection operation is performed, and allows the user to grasp the current situation.

[Means for solving problems]

The passage selection device according to this invention makes it possible to select the passage of a traveling type detector that measures the output inside a nuclear reactor by driving a motor of a passage selection mechanism and operating a limit switch, and includes a motor drive means for supplying driving power to a motor. Display means for displaying the operating state of the limit switch is provided, and a control circuit for giving commands to these means provides a drive signal to the motor when a selection operation is to be performed, and when the limit switch is operated, this drive signal is given to the display means, and the selection operation is not performed. The operating state of the limit switch is displayed on the hour display means.

[Effect]

The display means in this invention receives a signal from the control circuit via the limit switch and displays the selected state of the passage even when the passage selection operation is not performed.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings. In FIG. 1, numerals 1 to 5 are the same as the conventional one. 8 is a control circuit, which includes a decoder 8a that outputs a signal for setting a path;
All outputs of this decoder 8a are input.
An OR element 8b, a NOT element 8c that inverts the output of this OR element 8b, the output of this NOT element 8c is input to one of the inputs, each output of the above decoder is input to the other, and the output side is connected to the limit switch 3. The output of the OR element 8b is input to one of the inputs of the five OR elements 8d,
an AND element 8 whose other end is connected to the limit switch 3 and whose output side is connected to the drive means 4;
It is composed of e. If the decoder 8a receives a 3-bit signal sent from an operation panel, etc. as a selection signal, only the selected terminal outputs a HIGH level signal, and the other terminals output a LOW level signal. If not, all output terminals are at LOW level, and the conventional selection command switch 6 is replaced.

In the passage selection device configured as described above, a case will be described as an example in which a passage designated by symbol N is selected from a state where no passage is selected, similar to the conventional device described above. First, decoder 8
Input a 3-bit signal that sets N paths to a.
As for the output of the decoder 8a, a HIGH level signal is output only from the N terminal, and the other terminals (A ₁ , A ₂ , A ₃ ,
CAL), a LOW level signal is output. N
The limit switch 3 is on the NC side (inactive), and the HIGH level signal output from the output terminal of the decoder 8aN is ANDed via the OR element 8d of the N circuit and the limit switch 3.
It is input to one input terminal of element 8e. Also
The HIGH level signal output to the N output terminal of the decoder 8a is input to the other input terminal of the AND element 8e via the OR element 8b. Therefore, the output of the AND element 8e also becomes HIGH level, which is applied to the motor drive means 4, and thereafter, the path selection operation is performed in the same manner as in the conventional system described above. Next, a case where no selection command signal is input to the decoder 8a will be described. In this case, all output signals of the output side terminals of decoder 8a are LOW.
level, and via OR element 8b
The signal input to the AND element 8e is also at LOW level, and even if a HIGH level signal is input from the limit switch 3 side to the AND element 8e,
Since the output of AND element 8e is at LOW level, motor drive means 4 does not operate. At this time, OR element 8b
The LOW level output signal becomes HIGH level via the HOT element 8c, and is applied to all the limit switches 3 via the OR element 8d of all the circuits. For this reason, a HIGH level signal is given to the display means 5 via the limit switch 3 that is activated (turned to the NO side), and a lamp 5a corresponding to the activated limit switch 3 is displayed.
lights up. The operation of the control circuit 8 explained above is summarized in the flowchart shown in FIG. The part that is displayed is different from the conventional one. In addition,
If the path selection operation is not performed, the structure is such that a signal is sent to the limit switch 3 of all circuits.
For example, if the limit switch is damaged and is in the operating state (remains on the NO side) without contacting the pawl 18, it is also effective in detecting abnormalities at an early stage.

[Effect of idea]

As described above, according to this invention, the control circuit applies a drive signal to the motor drive means when a selection operation is to be performed, and when the limit switch is activated, this drive signal is applied to the display means, and when no selection operation is to be performed, the limit switch is activated to the display means. Since the configuration is configured to display the status, it is possible to obtain a passage selection device that allows the status of the passage to be confirmed even when no selection operation is performed. Further, even if the limit switch is damaged or there is an abnormality in the signal circuit from the control circuit to the limit switch, it can be detected at an early stage.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing the circuit configuration of a path selection device according to an embodiment of the invention, FIG. 2 is a flowchart showing the operation of the control circuit of FIG. 1, and FIG. 3 is a diagram of a conventional path selection device 4 is a front view showing the configuration of the passage selection mechanism shown in FIGS. 1 and 3, FIG. FIG. In the figure, 1 is a passage selection mechanism, 2 is a motor, 3 is a limit switch, 4 is a motor driving means, 5 is a display means, and 8 is a control circuit. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A traveling type detector that measures the power inside the reactor, and passages of this detector that can be freely selected by driving a motor and operating a limit switch having the same number of passages. a passage selection mechanism; a motor driving means for supplying motor drive power for the passage selection mechanism; a display means for displaying a passage selected in accordance with the operating state of the limit switch; and a selection signal for causing the detector to selectively operate the passage. When the selection signal is input, a drive signal is given to the motor drive means and the drive signal is given to the display means by the operation of the limit switch, and when the selection signal is not input, power is supplied to all the limit switches and the operating state of the limit switches is displayed. A path selection device comprising a control circuit that displays information using the display means. (2) The path selection device according to claim 1, wherein the control circuit has an AND element upstream of the motor drive means. (3) Path selection according to claim 2 of the utility model registration claim, characterized in that a selection instruction signal is input to one input terminal of the AND element, and a signal via a limit switch is input to the other input terminal. Device.