JP2001279649A - Gate position detecting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gate position detecting system causing no difference in a signal between the mutually separated gate displacement detecting side and opening indicating side, capable of accurately indicating gate opening and capable of reducing an error in a gate stopping position by properly detecting a gate position. SOLUTION: This gate position detecting system is provided with a rotary encoder 2 having a rotary part for integrally rotating with a rotary shaft of a hoisting drum. A programmable logic controller 3 is arranged for introducing opening by counting pulses outputted to the operation side from the rotary encoder 2. The signal received on the operation side is obtained as a digital signal encoded from the beginning by transmitting a digital signal composed of the existence of pulses to the operation side from the gate side. The gate position detecting system is strong against noise from an external part, and can be prevent a signal delay. Position detecting accuracy is strictly secured. The gate opening can be correctly indicated. An opening state of a gate can be correctly recognized on the operation side to avoid trouble by an error in the gate opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate position detecting system capable of accurately instructing a gate opening degree on an operation side when a gate is opened and closed.

[0002]

2. Description of the Related Art In gates such as sluice gates for adjusting the flow rate of a water channel, a remote control mechanism for opening and closing from a remote place using an actuator such as a motor has been generally used as an opening and closing mechanism. I have. In the case of such a remote control mechanism, in response to the rotation of the output shaft of the actuator and the displacement of the gate in conjunction with the rotation of the actuator to change the opening, the position of the gate is detected and the operator who remotely controls the gate is operated. A position detection system is used which indicates the opening. FIG. 4 shows an example of such a conventional position detection system. FIG. 4 is a schematic diagram illustrating the configuration of a conventional gate position detection system.

In each of the drawings, a conventional gate position detecting system 100 includes a hoist drum 51 for winding a wire rope 60 for suspending and supporting a gate 50 provided in a waterway.
A synchro-transmitter 101, which is disposed in the vicinity and is connected to a rotating shaft 51a of a hoisting drum 51 driven by an electric motor 70, detects the rotational displacement of the rotating shaft 51a, converts it into an electric signal, and outputs it; Is disposed at an operation point away from the synchro transmitter 101 and the gate.
And a synchro receiver 102 that derives the rotation displacement of the rotation shaft 51a from the electric signal received from the controller, acquires the gate position based on the rotation displacement, and instructs the opening degree.

[0004] The synchro transmitter 101 comprises a rotatable input shaft 1 directly connected to a rotating shaft 51 a of a hoisting drum 51.
01a, and a mechanism for transmitting an electric signal to the synchro receiver 102 according to the rotation state of the input shaft 101a. The sync receiver 102 is connected to the input shaft 1 based on the electric signal received from the sync transmitter 101.
An output shaft (not shown) that rotates in synchronization with the output shaft 01a is provided, and the gate position change amount is obtained from the rotation of the output shaft. The synchronizing receiver 102 integrates an analog indicator having a mechanism for obtaining the movement of the pointer 102a based on the amount of rotation of the output shaft, and displaying the gate opening based on a change in the indicated position of the pointer 102a with respect to the scale plate 102b. This is the configuration made.

A description will be given of a position detecting process in the above-described conventional gate position detecting system. When the rotating shaft 51a is driven by the electric motor, the winding drum 51 is rotated, and the wire rope is wound to open and close the gate, the rotating shaft 51a is connected to the rotating shaft 51a with the rotation of the rotating shaft 51a. The input shaft 101a of the synchro transmitter 101 rotates, and the rotational displacement is converted into an electric signal, which is output to the synchro receiver 102. The synchro receiver 102 receives this electric signal, and the rotation of the output shaft synchronized with the synchro transmitter 101 is obtained. By the rotation of the output shaft, the pointer 102a of the analog indicator portion changes the pointing position with respect to the scale plate 102b to indicate the opening degree of the gate.

[0006]

The signal transmitted between the synchro transmitter 101 and the synchro receiver 102 is an analog signal because the conventional gate position detecting system is configured as described above. Due to signal delay during transmission, etc., the synchro transmitter 101 and the synchro receiver 10
2 is likely to be out of synchronization, and a state where the gate opening based on the actual gate position does not exactly match the gate opening indicated by the pointer 102a on the operating side may occur, adversely affecting the gate position control. Has the problem that the Furthermore, when the opening and closing operation of the gate is repeatedly performed by operating and stopping the winding drum 51 finely, an error of the gate opening due to the synchronization deviation of the synchro electric machine is added, and the gate stop position accuracy is deteriorated. ,
There is a problem that there is a risk that gate position control may not be performed correctly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can accurately transmit information between a gate displacement amount detection side and an opening degree instruction side which are separated from each other, and can appropriately detect a gate position. An object of the present invention is to provide a gate position detection system that can accurately indicate a gate opening degree and can improve position accuracy in gate position control.

[0008]

A gate position detecting system according to the present invention detects a change in the position of a gate, converts the amount of displacement into an electric signal and outputs the electric signal, and the position detecting means and the gate. An opening obtaining means arranged at a location distant from the apparatus, receiving an electric signal output from the position detecting means and obtaining a gate position based on the electric signal, and a gate position obtained by the opening obtaining means And a display means for displaying in the form of a gate opening degree, wherein the position detecting means opens and closes the gate by changing the winding amount of a wire rope that directly or indirectly suspends the gate. A rotary encoder attached to a rotary shaft of a winding drum to be rotated, the rotary encoder having a rotary unit and a fixed unit that outputs a pulse for each unit angular displacement of the rotary unit, The opening degree calculating means analyzes the gate displacement amount based on the pulse count section for receiving and counting pulses output from the fixed section of the rotary encoder and the number of counts in the pulse count section to determine the gate opening degree. It is a programmable logic controller having an arithmetic control unit for acquiring and opening information of the gate to the display means.

As described above, in the present invention, the rotary encoder having the rotating portion that rotates integrally with the rotating shaft of the winding drum is provided as the gate-side position detecting means, and the output from the rotary encoder is provided on the operation side. A programmable logic controller that counts the number of pulses and guides the opening is provided, and a digital signal consisting of the presence or absence of a pulse is transmitted from the gate side to the operation side, so that the signal received on the operation side is encoded from the beginning. Digital signal, which is resistant to external noise and can also prevent signal delay, ensuring strict position detection accuracy, allowing the gate opening to be correctly indicated, and enabling the gate opening on the operating side. The state can be recognized correctly, and troubles due to errors in the gate opening can be avoided. In addition, by obtaining the gate opening in the arithmetic processing of the pulse output by the programmable logic controller, it is possible to easily correct the processing result corresponding to a predetermined condition change and to change / correct the arithmetic processing program, and to improve the accuracy of the processing result. It is easy to improve data processing capacity.

In the gate position detecting system according to the present invention, the programmable logic controller may obtain a rotation change amount of the hoist drum from a pulse output of the rotary encoder and add the rotation change amount, if necessary. Deriving the total rotation amount from a predetermined reference state of the winding drum, calculating the length of the wound wire rope from the rotation change amount while performing a predetermined correction corresponding to the value of the total rotation amount, The gate displacement is obtained from the wire rope length to obtain the gate opening. As described above, according to the present invention, the amount of rotation change of the winding drum and the total amount of rotation from a predetermined reference state are obtained based on the pulse output by the programmable logic controller, and then the total winding length of the wire rope is set to one pair. By deriving the newly wound length of the wire rope from the rotation change amount while performing a predetermined correction according to the total rotation amount of the corresponding drum,
The winding length of the wire rope per rotation of the winding drum, which varies depending on the length of the wire rope already wound on the drum, is appropriately recognized, and the winding is performed based on the rotation change amount of the drum. An accurate value of the wire rope length can be obtained, and a highly accurate gate opening can be obtained from the length of the wound wire rope, so that the reliability of the opening indication is greatly improved.

Further, in the gate position detecting system according to the present invention, the programmable logic controller counts the pulses starting from the gate fully closed state, and counts each count from the gate fully closed state as necessary. The actual opening degree of the gate at the time when the count number is reached is stored in advance as a database in association with each other, and when a predetermined count number is obtained from the pulse output of the rotary encoder, the corresponding gate is referred to by referring to the database. The opening is output to the display means. As described above, in the present invention, the count number of the pulse counted by the programmable logic controller and the gate opening at the time of counting are associated in advance and made into a database, and the predetermined count number of the pulse obtained from the rotary encoder during the gate opening / closing operation. By directly outputting the stored value of the gate opening corresponding to the above, the gate opening can be quickly and reliably derived by simple processing from the pulse count, and the gate opening instruction can be efficiently performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A gate position detecting system according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a gate position detecting system according to the present embodiment, FIG. 2 is a plan view of a gate winding section using the gate position detecting system according to the present embodiment, and FIG. 3 is a gate according to the present embodiment. FIG. 3 is an explanatory diagram of a mounting state of a rotary encoder of the position detection system.

In each of the drawings, the gate position detecting system 1 according to the present embodiment is a wire rope (not shown) for suspending a gate (not shown) disposed in a waterway.
The electric motor 70 is disposed near the winding drum 51 for winding
Having a rotating portion 2a attached to a rotating shaft 51a of a hoisting drum 51 driven by a rotary member and integrally rotating, and a fixed portion 2b for outputting a pulse for each unit angular displacement of the rotating portion 2a. The encoder 2 is disposed at a predetermined operation point apart from the rotary encoder 2 and the gate, receives a pulse output from the fixed portion 2b of the rotary encoder 2, and acquires gate opening degree information by predetermined arithmetic processing. Programmable logic controller (hereafter,
PLC 3) and a digital display 4 as display means for displaying the gate opening obtained by the PLC 3.

The rotary encoder 2 is a known rotary displacement sensor that generates a predetermined pulse for each unit angular displacement of the rotating portion 2a as an incremental type,
This is a mechanism in which a pulse generated by detecting the rotation displacement of the rotation shaft 51a of the drum is output to the PLC 3 on the operation side, and the gate opening degree can be indicated. The PLC 3 receives a pulse output from the fixed unit 2b of the rotary encoder 2 and counts the pulse. The PLC 3 analyzes a gate displacement based on the count number of the pulse count unit 3a to analyze a gate displacement. And a calculation control unit 3b that outputs the gate opening information to the digital display 4; and a count number obtained by the pulse counting unit 3a based on the pulse output and a gate opening obtained by the calculation control unit 3b. Each value is stored as an initial value of the process at the time of the next gate operation, and each count number of the pulse counted starting from the fully closed state of the gate in advance and the actual opening degree of the gate are respectively associated with each other. And a storage unit 3c for storing as

The digital display 4 is a known display for displaying the amount of change of the monitored object by a numerical value, and displays the value of the gate opening output from the PLC 3. Next, the operation of the gate position detection system based on the above configuration will be described. The rotating shaft 51a is driven by the electric motor 70,
In a state where the hoisting drum 51 is rotated and the wire rope 60 is hoisted to move the gate to perform the gate opening / closing operation, the rotating part 2a of the rotary encoder 2 integrally connected with the rotation of the rotating shaft 51a. Is rotated, and a pulse corresponding to the rotational displacement of the rotating portion 2a is output to the PLC 3 as a signal. The PLC 3 receives this pulse, counts the pulse in the pulse count unit 3a, and, based on the obtained count number, stores the gate opening corresponding to the count number previously stored in the storage unit 3c by the arithmetic control unit 3b. Is extracted and output as gate opening information. The opening information is output to the digital display 4 and the pointer 4
The opening degree of the gate can be visually recognized by changing the designated position with respect to the scale plate 5.

The gate opening information obtained by the PLC 3 is constantly monitored by a control unit (not shown) for controlling the electric motor 70 for driving the drum.
When it is determined that the gate opening has reached a predetermined value set in advance by the control unit, control for stopping the driving of the hoist drum 51 by the electric motor 70 is performed. As described above, the gate position detection system according to the present embodiment includes the rotary encoder 2 having the rotating portion 2a that rotates integrally with the rotating shaft 51a of the winding drum 51 and the rotary encoder on the operation side. Since the PLC 3 that counts the pulses output from 2 and guides the opening degree is disposed and transmits a digital signal including the presence or absence of the pulse from the gate side to the operation side, the signal received on the operation side is encoded from the beginning. Digital signal, resistant to external noise and signal delay can be prevented, the accuracy of position detection is strictly secured, the actual opening of the gate that opens and closes and the digital display on the operating side The gate opening specified by the heater 4 is made coincident, and the gate is reliably positioned at the gate position set by the control unit. It can be avoided, and the like. In addition, the number of pulses counted from the fully closed state of the gate by the PLC 3 and the gate opening at the time of this count are linked in advance to form a database, and a predetermined count of the pulses obtained from the rotary encoder 2 during the gate opening / closing operation is obtained. Since the corresponding stored value of the gate opening is output as it is, the gate opening can be quickly and reliably derived from the pulse count by simple processing, and the gate opening instruction can be efficiently performed.

In the gate position detecting system according to the above-described embodiment, the PLC 3 reads out the stored value of the gate opening corresponding to the pulse count number from the storage unit 3c and outputs it. PLC3
Then, based on the pulse output, the amount of rotation change of the winding drum 51 and the total amount of rotation from the gate fully closed state as a reference are obtained, and then the winding drum corresponding to the total winding length of the wire rope one-to-one. A mechanism that derives a newly wound length of the wire rope 60 from the amount of change in rotation while performing a predetermined correction according to the total amount of rotation of the wire 51 may be used. By properly recognizing the winding length of the wire rope 60 per rotation of the winding drum 51, which varies depending on the length of the wire rope 60, the wire rope 60 wound on the basis of the rotation change amount of the winding drum 51 is appropriately recognized. Can determine the exact value of the length,
A highly accurate gate opening can be obtained from the length of the wound wire rope 60, and the reliability of the opening instruction can be improved.

In the gate position detecting system according to the embodiment, the digital display 4 is used as a display means for displaying the gate opening.
However, the present invention is not limited to this, and it is also possible to use an analog display, an analog recorder, or the like that displays the gate opening at the position of the pointer that rotates with the gate opening relative to the fixed scale plate.

[0019]

As described above, according to the present invention, a rotary encoder having a rotary portion that rotates integrally with a rotary shaft of a winding drum is provided as a gate-side position detecting means, and a rotary encoder is provided on the operation side. By installing a programmable logic controller that counts the pulses output from the rotary encoder and guides the opening, and transmits a digital signal consisting of the presence or absence of the pulse from the gate side to the operation side,
The signal received on the operation side is obtained from the beginning as a coded digital signal, which is resistant to external noise, prevents signal delay, and ensures the accuracy of position detection. An instruction can be given correctly, and the operation side can correctly recognize the state of the opening of the gate, and it is possible to avoid a trouble due to an error in the opening of the gate. In addition, by obtaining the gate opening in the arithmetic processing of the pulse output by the programmable logic controller, it is possible to easily correct the processing result corresponding to a predetermined condition change and to change / correct the arithmetic processing program, and to improve the accuracy of the processing result. This has the effect that the data processing capacity can be easily improved.

According to the present invention, the amount of change in rotation of the winding drum and the total amount of rotation from a predetermined reference state are determined by the programmable logic controller based on the pulse output, and then the total winding length of the wire rope is determined. By newly deriving the newly wound length of the wire rope from the rotation change amount while performing a predetermined correction corresponding to the total rotation amount of the drum corresponding to the one-to-one correspondence, the wire rope has already been wound on the drum. Different values depending on the length of the wire rope The wire rope winding length per rotation of the winding drum is properly recognized, and the exact value of the length of the wound wire rope is determined from the change in the rotation of the drum. Can be obtained, and a highly accurate gate opening can be obtained from the length of the wound wire rope, which has an effect of greatly improving the reliability of the opening instruction.

Further, according to the present invention, the count number of the pulse counted by the programmable logic controller and the gate opening at the time of counting are linked in advance to form a database, and during the gate opening / closing operation, a predetermined number of pulses obtained from the rotary encoder are determined. By directly outputting the stored value of the gate opening corresponding to the number of counts, the gate opening can be derived quickly and reliably by simple processing from the pulse count, and the gate opening instruction can be efficiently performed. Having.

[Brief description of the drawings]

FIG. 1 is a block diagram of a gate position detection system according to an embodiment of the present invention.

FIG. 2 is a plan view of a gate winding unit using the gate position detection system according to one embodiment of the present invention.

FIG. 3 is an explanatory diagram of a mounting state of a rotary encoder of the gate position detection system according to the embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating the configuration of a conventional gate position detection system.

[Explanation of symbols]

1, 100 Gate position detection system 2 Rotary encoder 2a Rotating unit 2b Fixed unit 3 Programmable logic controller (P
LC) 3a Pulse counting unit 3b Operation control unit 3c Storage unit 4 Digital display 50 Gate 51 Hoisting drum 51a Rotating shaft 60 Wire rope 70 Electric motor 101 Synchro transmitter 101a Input shaft 102 Synchro receiver 102a Pointer 102b Scale plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takayuki Toyoshima 3-1, Higashi 3-chome, Kogamachi Station, Kasuya-gun, Fukuoka Prefecture F-term (reference) 2D019 AA54 2F069 AA02 AA06 AA34 AA44 BB40 GG25 GG43 HH15 MM40 QQ07

Claims (3)

[Claims] 1. A position detecting means for detecting a change in the position of a gate, converting a displacement into an electric signal and outputting the electric signal, and being disposed at a position distant from the position detecting means and the gate and outputting from the position detecting means. Opening degree acquisition means for receiving the obtained electric signal and acquiring the gate position based on the electric signal, and display means for displaying the gate position obtained by the opening degree acquisition means in the form of a gate opening degree. In the gate position detecting system, the position detecting means is attached to a rotating shaft of a hoist drum that opens and closes the gate by changing a winding amount of a wire rope that directly or indirectly suspends the gate, and integrally rotates. A rotary unit having a rotating unit that moves and a fixed unit that outputs a pulse for each unit angular displacement of the rotating unit, wherein the opening calculating means is a fixed unit of the rotary encoder. A pulse counting unit that receives and counts the output pulses; and a calculation control unit that obtains a gate opening by analyzing a gate displacement amount based on the count number in the pulse counting unit, and includes gate opening information. A gate position detection system, which is a programmable logic controller that outputs a signal to the display means. 2. The gate position detecting system according to claim 1, wherein the programmable logic controller obtains a rotation change amount of the hoist drum from a pulse output of the rotary encoder, and adds the rotation change amount. Deriving the total rotation amount of the drum from a predetermined reference state, calculating the length of the wound wire rope from the rotation change amount while performing a predetermined correction corresponding to the value of the total rotation amount, and A gate position detection system, wherein a gate displacement is obtained from a rope length to obtain a gate opening. 3. The gate position detection system according to claim 1, wherein the programmable logic controller counts pulses starting from a gate fully closed state, and counts each number from the gate fully closed state and the count. The actual opening degree of the gate at the time when the number is reached is stored in advance as a database in association with each other, and when a predetermined count number is obtained from the pulse output of the rotary encoder,
A gate position detecting system for outputting a corresponding gate opening degree to the display means by referring to the database.