JP2004257420A - Intelligent type valve actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intelligent type valve actuator having functions of collecting state data from various sensors, self-controlling opening/closing states of a passage by a valve, self-diagnosing deterioration states or the like of a device, predicting replacement timing or working states of female threads, seals, etc., and conducting operation actuation and maintenance. <P>SOLUTION: In this intelligent type valve actuator, measurement values from the sensors are displayed, measurement values of the state data are processed in response to information beyond set values 61 by a control circuit 6 to generate state output 35 for replacement and repair of parts, alarm, etc., and passage opening/closing actuation by the valve 5 is self-controlled in response to the measurement values. A controller 40 controls the set values 61 in response to the measurement values through a communication unit 38 connected to the control circuit 6. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve actuator for moving up and down a valve such as a water gate, a door, a gate, a valve, etc. (generally referred to as a valve) provided for opening and closing a flow path. The present invention relates to an intelligent valve actuator that monitors a driving system state such as a detection state or the like and a wear state of a female screw and performs a self-diagnosis.
[0002]
[Prior art]
Conventionally, in a flow path where a fluid such as a water channel, a water purification plant, a power plant, and a river flows, a gate, a water gate, a door body, a valve body, and other valves for opening and closing the flow path to control the flow rate are provided. A valve actuator is used to operate the load. As for valve actuators for driving valves, there is a trend toward a centralized information system controlled by a controller, and it is known that a controller equipped with a controller that can perform a simple part of valve opening and closing control is known. (For example, see Patent Document 1).
[0003]
Conventionally, as a screw wear amount detecting device in a valve driving actuator device, a reference screw is provided to detect a gap with a screw to be used, thereby detecting a wear amount of a female screw. Alternatively, as a screw wear amount detecting device, a load torque curve of a screw is detected, and a wear amount of a female screw is calculated and obtained from a change in torque due to an increase in screw gap. The female screw wear amount detecting device includes a sleeve rotatably mounted on the housing, a female screw member spline-fitted to the sleeve, a spindle with a male screw meshing with the female screw member and movable in the axial direction, and a load on the spindle. A model female screw that is rotatably attached to the spindle in a state where the female screw member is not applied, rotates integrally with the female screw member, and is capable of moving downward in the axial direction according to an axial movement corresponding to the wear amount of the female screw member; A moving block which is provided with a bearing fitted in an annular groove formed in the housing and is guided by a guide pin fixed to the housing and which can move only in the axial direction in response to the axial movement of the model female screw, and the female screw member Differential transformer for detecting the moving distance of the moving block corresponding to the wear amount of the female screw Are those composed of moving amount sensor made of (for example, see Patent Document 2).
[0004]
In the valve equipment, abnormality diagnosis and deterioration prediction devices that grasp the signs of abnormalities during operation, identify abnormalities, identify repaired parts, limit the inspection range of the motor-operated valve, and judge abnormal signs are known. I have. In the abnormality diagnosis and deterioration prediction device, a driving force sensor provided in a drive unit is connected to a diagnosis device, and an energy sensor for detecting energy supplied to the drive unit and a vibration sensor for detecting vibration of the valve device are temporarily installed in the valve device. The data conversion unit converts the detection signals output from these sensors into predetermined signals, and analyzes the diagnostic data information for each diagnostic item against the maintenance record including the permissible value and the diagnostic result for each diagnostic item. The diagnostic processing is performed to determine whether the state is normal or abnormal, and to further predict deterioration (for example, see Patent Document 3).
[0005]
[Patent Document 1]
JP-A-11-107254 (pages 2, 3 and FIG. 6)
[Patent Document 2]
Japanese Utility Model Publication No. 8-9603 (page 1, FIG. 2)
[Patent Document 3]
JP-A-2002-130531 (page 1, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, in conventional electric valve actuators, limit detection such as position limit and torque limit is achieved using mechanical transmission means incorporating gears, cams, and the like, and an opening indicating the position of the valve flow path is provided. At present, the degree meter also uses a gear transmission mechanism. Therefore, since the conventional transmission valve actuator employs a switch unit such as a limit switch or a torque switch, the number of components for configuring the transmission unit of the switch unit, the transmission unit of the valve opening, and the like increases, and the number of components is large. As a result, there is a problem that the failure rate increases. In addition, special techniques are required for adjusting these switch units, and since the case is opened for adjusting parts, related accidents and failures have occurred. Further, the valve opening meter converts the total number of rotations (360 ° × n rotations) of the sleeve shaft into, for example, a movement of 0 ° to 270 °, so that there are several combinations of reduction gears. Was difficult to change after delivery.
[0007]
In addition, as for the conventional device for diagnosing abnormalities and predicting deterioration such as a device for detecting the amount of wear of a screw, for example, a device that detects a gap using a standard screw, the standard screw must be manufactured with high accuracy, and There is a problem that a complicated structure is required to incorporate the screw, which increases the cost. Alternatively, a screw wear amount detection device that detects the load torque curve of a screw and calculates the amount of wear of the internal thread from the change in torque due to an increase in the gap of the screw can be used to analyze the wear of the internal screw using a torque waveform. The difference between the torque waveform and the torque waveform is difficult to understand, and there is a problem that the wear of the female screw cannot be detected with high accuracy.
[0008]
In addition, the conventional screw wear amount detector is provided with a secondary screw provided with a spring in addition to the main drive screw, and detects the distance from the main drive screw to detect the screw wear amount. It is difficult to measure the distance between the main drive screw and the auxiliary screw. In addition, the mechanical type has a complicated structure, and requires high processing accuracy for each member. In addition, there is a problem that the abrasion powder of the screw is liable to be adversely affected by biting between the members, and the detection accuracy is not reliable. Further, the device for detecting the amount of play due to the amount of stem bush wear in the valve device described above is a device that estimates and calculates the amount of idling of the gap from the torque curve. The amount of wear cannot be detected, and the torque sensor (distance sensor, strain gauge) is configured to be incorporated inside the gear case, cannot be easily incorporated, and it is difficult to perform a remodeling operation on site.
[0009]
[Means for Solving the Problems]
An object of the present invention is to provide a valve actuator for driving a spindle for operating a valve such as a sluice, a door, a valve, or a gate so that the spindle can be moved up and down by a stem bush. Internal temperature and humidity detection, detection of wear amount of female screw of stem bush, deterioration prediction based on state data of motor and electronic parts, wear deterioration of drive system parts, motor drive current state data, etc., electrically detected and monitored Intelligent to perform self-diagnosis, and to normalize the device itself by a built-in control circuit corresponding to the information, and to display parts replacement, alarms, etc. according to the information. To provide a mold valve actuator.
[0010]
According to the present invention, there is provided a spindle mounted with a valve for opening and closing a flow path and supported in a vertically movable manner in a housing, a female screw screwed into a male screw provided in the spindle, and rotatably supported by the housing. A transmission device having a stem bush, a worm wheel fixed to the stem bush, and a worm to which the rotation from the driving means is transmitted by meshing with the worm wheel in order to rotate the stem bush to vertically move the spindle. A reversing device provided on a motor constituting the driving means; a setting device for presetting an appropriate set value of state data; various sensors for detecting measured values of the state data; Comparing the measured value and the set value in response to the measured value A control circuit that operates the drive means in response to information that the measured value deviates from the set value, performs a program operation, and appropriately self-controls the open / close state of the flow path by the valve; A display device that displays and displays processes such as parts replacement and repair and an alarm in response to the information issued from the control circuit; communication connected to the setting device, the control circuit, the display device, and the control circuit A control board provided with a unit; and display and display of the measured value, the information, and the set value through the communication unit, and operating the driving means to appropriately control the open / close state of the flow path by the valve. And a controller that performs the operation.
[0011]
The various sensors for detecting the state data each include an absolute encoder that detects the valve position and detects the rotation speed of the spindle to detect the opening degree of the flow path of the valve, and integrates the rotation speed. A rotational speed sensor, a torque sensor for detecting torque applied to the spindle, a temperature sensor for detecting a temperature of a region of the motor and the control board as the driving means, and a humidity sensor for detecting humidity inside the valve actuator. A vibration sensor for detecting the vibration of the valve actuator, a female screw wear sensor for detecting the wear amount of the female screw of the stem bush using the rotation speed sensor and the torque sensor, and a starting current for driving the motor. It includes a current sensor that detects and detects the number of operations.
[0012]
The female screw wear sensor determines a gap amount between the male screw and the female screw based on a torque curve obtained according to an axial movement amount of the worm measured by the torque sensor in the control circuit, A rotation speed sensor detects a rotation speed of the stem bush corresponding to the gap amount, and calculates a multiplication of the rotation speed of the stem bush by a pitch of the female screw to detect a wear amount of the female screw.
[0013]
The controller controls the control circuit of the control board provided on each of the plurality of valve actuators. The controller is a personal computer and a wireless remote controller. Further, the display device is an LCD for displaying the status data, the setting status of the various set values, and various information of component failure data and abnormalities.
[0014]
Further, the controller predictively controls various information on the life of the sliding portion of the component and each seal based on the predetermined state data based on the measured value obtained by the rotation speed sensor. Further, the controller predictively controls various kinds of information on deterioration of components such as a motor and an electronic element, which are the driving means, based on the predetermined state data, based on the measured value obtained by the temperature sensor. Further, the controller predictively controls various kinds of information such as a faulty wiring of the heater, a faulty mounting of the cover, and a state of water infiltration into the cover based on the predetermined state data based on the measured value of the humidity sensor.
[0015]
As described above, this intelligent valve actuator is equipped with an absolute encoder to detect the valve position regardless of the presence or absence of the control power supply. The number of points can be reduced, the cost and the failure rate can be reduced, and various sensors can detect the valve position, current, torque, temperature, humidity, vibration, etc. of the motor equipped with a reversible device, and the measurement detected by the control circuit The driving means can be driven in accordance with a predetermined program operation in accordance with the value information and can be self-controlled to an appropriate state, and the predetermined set values of various state data can be safely, easily and reliably. It can be set, and the status itself can be monitored by the self-diagnosis function to maintain the device itself.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of an intelligent valve actuator according to the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 3, this valve actuator opens and closes a flow path pipe 16 fixed to a housing 3 connected to a flow path of a water channel, a water purification plant, or the like, and a flow channel 4 of the flow channel pipe 16, for example. For this purpose, a valve 5, which is a load body such as a gate, a water gate, a door body, a valve body, or the like, is mounted, and is screwed to a spindle 1 supported on the housing 3 so as to be vertically movable and provided on a spindle 1 provided on the spindle 1. A stem bush 2 having an internal thread 11 and rotatably supported by the housing 3 and a reversible device (reversible electromagnetic contactor) 43 serving as a driving device for the stem bush 2 for rotating and driving the internal thread 11 to move the spindle 1 up and down. The transmission device 24 includes gears 24A and 24B for transmitting the rotation from the motor 12 having the gears to the spindle 1, a speed reducer, a clutch 27 and the like. The transmission device 24 has a worm wheel 8 fixed to the stem bush 2 and a worm 9 meshed with the worm wheel 8 to transmit rotation from the drive means in order to rotate the female screw 11 to move the spindle 1 up and down. are doing.
[0017]
The housing 3 includes a plurality of housing members, and is provided with, for example, a flange portion 25 and a support step portion 26 for rotatably supporting the stem bush 2 for accommodating a drive system of the valve 5. A bearing 21 such as a thrust bearing is interposed between the flange portion 25 and the supporting step portion 26 of the housing 3, and the stem bush body 20 is rotatably disposed on the housing 3 via the bearing 21. The stem bush 2 having the female screw 11 is fixed to the fitting portion 19 of the stem bush body 20 by a spline or a key. A worm wheel 8 constituting a worm gear is fixed to an outer peripheral portion of the stem bush body 20 by a spline, a key, a press fit, or the like. Therefore, this valve actuator is configured such that the worm wheel 8, the stem bush body 20 and the stem bush 2 are integrally rotated by the worm 9 which is rotated from the driving device through the transmission device 24. To seal the housing 3 so that fluid such as water in the flow path 4 does not enter the transmission 24 and the female screw 11, a ring-shaped gland packing 15 through which the spindle 1 is inserted is disposed on the support step 23 of the housing 3. The gland packing 15 is fixed to the housing 3 by a holding member 22. In this valve actuator, the female screw 11 rotates in response to the rotation of the stem bush 2, and the male screw 10 moves up and down along the female screw 11 by the rotation of the female screw 11, whereby the spindle 1 moves up and down. . A valve fitting portion 18 into which the valve 5 is fitted is formed in the flow channel tube 16, and the flow channel 4 is closed by fitting the valve 5 into the valve fitting portion 18, and as shown in FIG. Is raised, the flow path 4 is open.
[0018]
As shown in FIG. 1 and FIG. 3, this valve actuator is provided with various sensors provided for detecting its state data, that is, a screw gear provided with a worm shaft 29 with the rotation speed of the spindle 1 for detecting the valve position. A rotation speed sensor 7 having an absolute encoder for detecting and integrating the rotation speed through 68, a torque sensor 28 for detecting a torque applied to the spindle 1, a temperature of a region of the motor 12 as a driving means and the control board 30 are detected. Temperature sensors 33 and 34 composed of a thermistor or the like, a humidity sensor 36 for detecting the humidity inside the valve actuator, a valve opening sensor for detecting the opening of the flow path 4 of the valve 5, and a vibration sensor for detecting the vibration of the valve actuator. 37 and a female screw wear sensor for detecting wear of the female screw 11 of the stem bush 2 And a current sensor 32 for detecting the number of times the operation to detect the starting current for driving the motor 12.
[0019]
This valve actuator is an intelligent valve actuator which is equipped with a motor 12 provided with a rotation speed sensor 7 composed of an absolute encoder and a reversing device 43 and can be self-controlled by a control circuit 6, and achieves a self-diagnosis function. A program operation can be performed by comparing and determining a measured value obtained by detecting various state data with a set value set by a predetermined setter 39, and driving the motor 12 of the driving means. . As shown in FIG. 2, the valve actuator is provided with a control circuit 6 and a display device 17 on a control board 30, and the detected values, ie, measured values, detected by the various sensors are input to the control circuit 6. This is processed by the control circuit 6 and displayed on the display device 17. Further, since this valve actuator is provided with the rotation speed sensor 7 composed of an absolute encoder, there is no need to provide a mechanical switch unit composed of a limit switch and a torque switch as in the prior art. 5 can be detected, and the adjustment of the position limit and the torque limit can be easily set from outside without opening the cover or the housing 71. Further, the position of the valve 5 is set by detecting the rotation speed of the spindle 1 by an absolute encoder constituting the rotation speed sensor 7, detecting the position of the valve 5, and accurately and easily setting the opening / closing limit of the flow passage 4 by the valve 5. And input to the setting device 39 for setting. In addition, the customer operator who has delivered the valve actuator can easily adjust even when the total number of rotations for displaying the position of the valve 5 is changed, which can contribute to cost reduction. Since the motor 12 is provided with the reversible unit 43, which is a magnetic switch, as an operation switch, the housing 71 that covers the switch unit 72 can be configured to have a non-penetrating structure, and water can be prevented from entering the switch unit 72.
[0020]
The control circuit 6 compares the measured value of the state data with the limit value at the preset set value 61 in the comparator 60, and responds to the information that the measured value deviates from the set value 61. In addition to issuing a processing command such as replacement of parts, alarming, and the like, the motor 12 is driven through the reversible device 43 as a driving means in accordance with the program operation, so that the open / close state of the flow path 4 by the valve 5 can be appropriately controlled. Further, the control circuit 6 compares the measured value of the state data with a limit value of each of the preset set values 61 in a comparator 60 and calculates information indicating that the measured value is within the range of the set value 61. Self-control such as issuing an operation maintaining process command in the operating state as it is in response to the
[0021]
A controller 40 including a personal computer (personal computer monitor) 65 and / or a radio-wave radio remote controller (remote control, wireless monitor) 64 is connected to the control board 30 provided for each of the plurality of valve actuators. Can be individually controlled. That is, one controller 40 can independently control a plurality of valve actuators. Further, the display device 17 can display the status data of the valve actuator, the setting status of various set values, and the failure data of the components of the valve actuator. The controller 40 responds to the measured values of the various sensors to drive the motor 12 as the driving means and to issue and control an operation maintaining process command to continue the next operation of changing the open / close state of the flow path 4 by the valve 5. It is configured as follows. Further, the controller 40 can control the set value 61 in response to the measured value through the communication unit 38 connected to the control circuit 6 and can control the next operation in accordance with the measured value. The motor 12, each sensor, and the control circuit 6 are configured to be driven by being supplied with power from a power supply through a terminal unit 45 (FIG. 4) by a controller 40 or a switch provided on site.
[0022]
In this valve actuator, for example, the control circuit 6 includes a rotation speed sensor 7, an absolute encoder, a torque sensor 28, a temperature sensor 33 for detecting the temperature of the motor 12, a temperature sensor 34 for detecting the temperature of the control board 30, and a valve actuator. The humidity sensor 36 for detecting the humidity in the electric component area of the control board 30 inside the housing 3 constituting the housing 3, the valve opening sensor for detecting the opening of the valve 5 with respect to the flow path 4, and the vibration of the drive system of the valve actuator. Data 31 for each predetermined period is input from a vibration sensor 37 for detecting, a female screw wear sensor for detecting wear of the female screw 11 of the stem bush 2 meshing with the male screw 10 of the spindle 1, and a current sensor 32 for driving the motor 12. Displays the measured value in response to the measured value. It is displayed on the LCD of the display device 17 through 62, also the information exchange with the controller 40 through the communication unit 38 connected to the control circuit 6. The control circuit 6 drives and controls the valve actuator in response to a command value from the controller 40. Therefore, the controller 40 can check the diagnosis contents of the valve actuator through the communication unit 38, and appropriately set various state data to the control circuit 6 by the remote control 64 or the personal computer 65 or drive the motor 12 to drive the motor 12. Can drive.
[0023]
The current sensor 32 is capable of detecting the motor current and measuring the number of starts. The trigger sensor arbitrarily sets a trigger value as a start current, counts a start current generated when the motor starts, and starts the count value. Number of times. At this time, the starting current has a higher value than the normal current. The life prediction outputs an alarm of the status output 35 when a preset number of activations is exceeded. Normally, the current value is stored and managed as data. When the current value is out of the range of the data, it is set as an indicator of aging, for example, set to 1A, and the current value is increased by aging, for example, 1.7A. When the current value has increased, the normal current value has exceeded a predetermined range and it is determined that the life of the seal has expired, and the control circuit 6 (CPU) issues an output indicated by reference numeral 41 as an alarm output. ing.
[0024]
The torque can be detected and set accurately and easily by the torque sensor 28 incorporated in the worm shaft 29 via the torque spring 67. The torque sensor 28 detects the amount of movement of the worm 9 by converting it into an electric signal, and can linearly detect the torque applied to the valve 5, that is, the spindle 1. That is, in the torque detection, the moving amount of the worm 9 is detected by the linear potentiometer 49 and converted into a torque value. When the measured value of the torque applied in the opening and closing direction of the valve 5 exceeds a preset torque value, an alarm of the state output 35 is output. If the torque data is stored and managed (logging), and the data is out of the data range, the torque may increase due to aging or the like, which is determined as the life of the seal, and the alarm output of the status output 35 is output. It is configured to
[0025]
The temperature sensor 33 of the motor 12 constantly detects the motor winding temperature, detects a motor abnormality, and prevents burnout and the like. The temperature sensor 33 measures the motor winding temperature using a thermistor attached to the motor winding. When the value measured by the temperature sensor 33 becomes equal to or higher than a predetermined motor winding temperature set in advance, it is determined that the torque / motor is abnormal, and an alarm is output from the status output 35.
[0026]
Further, the controller 40 predictively controls, based on predetermined data, a wiring failure of a heater provided in the valve actuator, a cover installation failure that constitutes the housing 3, and a situation of water infiltration into the cover based on a value measured by the humidity sensor 36. Is what you can do. In the humidity detection, a humidity sensor 36 is mounted in the housing 3, that is, in the actuator device, and the humidity in the device is detected. When the humidity reaches a predetermined humidity, for example, 70% or more, it is determined that the inside of the machine is flooded or the packing is defective, and an alarm is output from the status output 35.
[0027]
The display device 17 is composed of an LCD, which is a digital display, that is, a liquid crystal display, and can check various set values and operation states of the valve actuator. Since the intelligent valve actuator is an electronic position gauge, there is no need for a conventional position meter with a pointer driven by a gear transmission. The display device 17 displays, in particular, the number of times the valve 5 has been operated, the opening / closing torque for opening and closing the flow path 4 of the valve 5, the temperature and humidity of the electric parts provided on the motor 12 and the control board 30, and the abrasion state of the female screw 11. In addition to the display, the set value 61 of the upper and lower limit values can be displayed. The display device 17 samples data 31 of each measurement value from the current sensor 32, the temperature sensor 33, the rotation speed sensor 7, and the torque sensor 28, and displays the data 31 on the LCD through the display conversion means 62. Is configured. Data 31 is sampled from the measured value of the rotation speed sensor 7 through a pulse / V converter 63.
[0028]
The female screw wear sensor determines the gap amount between the male screw 10 and the female screw 11 based on the torque curve obtained according to the axial movement amount of the worm 9 as described later, for example. By detecting the rotation speed of the stem bush 2 corresponding to the gap amount and multiplying the rotation speed of the stem bush 2 by the pitch of the female screw 11, the wear amount of the female screw 11 can be detected. That is, when the female screw 11 is operated from the valve closing side to the valve opening direction, the torque value changes in the order of the idling portion of the female screw 11, the hammer blow, and then the actual load. By detecting the changing time, the female screw 11 is detected. Can be detected. At this time, by taking the encoder count value, a more accurate operating point can be detected, and the measurement accuracy can be improved. When the female screw 11 of the stem bush 2 becomes worn beyond a predetermined level, an alarm is output to the status output 35 to urge replacement of the female screw 11. This is because, when abnormal wear of the female screw 11 occurs, the valve body, that is, the spindle 1 falls, and a dangerous state occurs in which the flow path 4 is closed.
[0029]
Further, the controller 40 can predictively control the life of the sliding part of the valve actuator component and the life of each seal based on the data measured by the rotation speed sensor 7 based on predetermined data. Further, the controller 40 issues a command to the control circuit 6 so that the control circuit 6 itself determines the deterioration of the motor 12 and the electric parts as the driving means based on the measured values of the temperature sensors 33 and 34 composed of thermocouples and the like. And self-control can be performed. In this intelligent valve actuator, the set value of the current by the current sensor 32, the set value of the torque by the torque sensor 28, the set value of the wear amount of the female screw 11 by the female screw wear sensor, the set value of the temperature by the temperature sensors 33 and 34, The set value of the humidity by the humidity sensor 36 can be set by the setter 39 according to a command from the controller 40. The status display and storage data (logging data) are output to the controller 40 through the communication unit 38.
[0030]
In this intelligent valve actuator, the transmission device 24 in the valve actuator having the manual handle 44 includes a speed reducer, a worm gear, etc., for transmitting rotation from the motor 12 or the driving means of the manual handle 44. The female screw 11 of the bush 2 is driven to rotate, and the spindle 1 having the male screw 10 screwed to the female screw 11 is moved up and down. When the manual handle 44 is manually rotated, the female screw 11 of the stem bush 2 rotates, whereby the spindle 1 having the male screw 10 meshing with the female screw 11 moves up and down, and the valve 5 fixed to the spindle 1 opens and closes the flow path 4. I do. This valve actuator automatically controls the opening and closing of the valve 5 by driving the motor 12 provided with the reversing device 43 by the instruction of the controller 40 or by the self-control of the control circuit 6, or the manual rotation of the manual handle 44 at the site. The valve 5 can be opened and closed manually. In this valve actuator, a motor 12 is attached to one end of a worm shaft 29 provided with the worm 9 through a gear transmission system, and a linear potentiometer 49 as a position sensor for detecting the movement amount of the worm 9 is provided on the other end of the worm shaft 29. (FIG. 5).
[0031]
Since the female screw wear sensor is disclosed in detail as a screw wear amount detecting device of Japanese Patent Application No. 2002-309679 filed by the present applicant, the description thereof is omitted here. Of course, other types of sensors can be used as the female screw wear sensor. Here, the above-mentioned screw wear amount detecting device, that is, a female screw wear sensor, will be briefly described with reference to FIG.
[0032]
For example, the following can be applied to the female screw wear sensor. The screw wear amount sensor determines a gap amount between the male screw 10 and the female screw 11 based on a torque curve obtained in accordance with an axial movement amount of the worm 9, and determines a stem corresponding to the determined gap amount. It is characterized in that the rotation speed of the bush 2 is detected, and the rotation amount of the stem bush 2 is multiplied by the pitch of the female screw 11 to detect the wear amount of the female screw 11. The rotation speed of the stem bush 2 is detected by a rotation speed sensor 7 composed of an absolute encoder mounted on the outer peripheral side of the stem bush 2 through a screw gear 68. The rotation speed sensor 7 can be easily attached to the stem bush 2 by making the detection terminal 14 of the potentiometer face the sliding contact 13 fixed to the stem bush 2. Further, an electric signal according to the axial movement amount of the worm 9 is detected by a linear potentiometer 49 (FIG. 5) as a position sensor. The above can be expressed by the following equations. The amount of screw wear is ΔA, the pitch of the female screw 11 is P, and the rotation speed of the stem bush 2 to which the female screw 11 is fixed corresponding to the gap amount between the female screw 11 and the male screw 10 due to the wear of the female screw 11 is a rotation angle α. Expressed as follows, That is, ΔA = P × (α / 360).
[0033]
The linear potentiometer 49 as a position sensor is accommodated in a case 53 fixed to the housing 3 and a cover 54 fixed to the case 53. The linear potentiometer 49 is supported by a cover 54 and a plate 55 fixed to the case 53, and a joint 56 is attached to an end thereof. The rotor shaft 58 rotatably supported by a bearing 57 provided on the joint 56 is in contact with the end surface of the worm shaft 29 of the worm 9. Accordingly, the movement amount of the worm 9 is transmitted to the detection terminal 59 of the linear potentiometer 49 via the rotor 56 and the joint 56 slidably mounted on the load. The amount of movement of the detection terminal 59 of the linear potentiometer 49 is output as an electric signal and is input to the controller as information on the amount of movement of the worm 9.
[0034]
In this valve actuator, information of measured values from various sensors 7, 28, 32, 33, 34, 36, and 37 is input to the control circuit 6, and the information is processed by the control circuit 6, and is processed in a predetermined number of characters. A display device 17 for digital display is provided. Although not shown, the valve actuator includes a power switch of a power supply device having a transformer, an emergency stop switch for stopping the valve actuator in an emergency, a remote communication switch for exchanging information with a central control device, and the like. And a reversible unit 43 provided on the motor 12 operated by three-phase alternating current. In this valve actuator, the operation of the actuator is controlled by a transformer or a reversing device 43 provided in the main body based on information obtained by a self-diagnosis function. A display battery 70 and the like are provided in a case 71.
[0035]
Next, a device setting method for the self-diagnosis function of the valve actuator will be described. This valve actuator turns on the power switch. The normal display on the display device 17 of the valve actuator is confirmed. In the position setting mode for setting the position of the valve 5, the upper and lower limits of the position of the valve 5 are set as the set value 61. That is, the upper limit value, that is, the opening limit value of the valve 5 for the flow path 4 of the valve actuator is set as the set value 61, and the lower limit value, that is, the closing limit value of the valve 5 for the flow path 4 is set as the set value 61. The set value 61 of the open limit value and the close limit value is detected by the rotation speed sensor 7 composed of an absolute encoder. The rotation speed sensor 7 accumulates or accumulates the rotation speed of the spindle 1, detects the rotation speed of the spindle 1, and uses it as state data for estimating the life of the sliding part and the seal of each part. Further, the upper limit and the lower limit of the torque applied to the valve 5 provided on the spindle 1 are set as predetermined set values 61. The upper limit value and the lower limit value of the torque value when the valve is opened and the torque value when the valve is closed applied to the transmission device 24 of the spindle 1 to which the valve 5 is attached are set as predetermined values 61. Further, the upper limit value and the lower limit value of the temperature of the motor 12 and the temperature of the area of the control board 30 are set as predetermined set values 61. The upper limit value and the lower limit value are set as a set value 61 within a predetermined temperature range in order to prevent adverse effects such as burn-in of the motor 12 due to the ambient temperature and malfunction due to the temperature of the electric components. In this valve actuator, in position setting, torque setting, and temperature setting, for example, control is performed so that the lower limit set value is set to the upper limit set value of -100 pulses so that the lower limit set value does not exceed the upper limit set value. . This valve actuator confirms the normal display on the display device 17 and, if it has a predetermined set value 61, determines those settings. The rotation direction of the spindle 1, that is, whether the flow path 4 of the valve 5 is rotated in the opening direction or the closing direction is set. Next, the LS operation mode is set. Further, remote communication is set. By performing these operations, the setting processing of various state data is completed, and the display device 17 is returned to the normal display.
[0036]
This valve actuator can display an abnormality display on the display device 17. For example, when a torque abnormality occurs, the abnormality LED is turned on and the abnormality output relay is turned on in a state where the opening degree of the flow path 4 is continuously displayed by the valve 5 and the opening / closing operation of the valve 5 is stopped. Can be alarmed, and when the abnormality is cleared, the abnormal LED is turned off and the abnormal output relay is turned off. When a temperature abnormality occurs in the motor 12 or the electric parts, similarly to the case of the torque abnormality, the abnormality LED is turned on in a state where the opening degree of the flow path 4 is continuously displayed by the valve 5 and the opening and closing operation of the valve 5 is stopped. , The abnormal output relay is turned on, whereby a temperature abnormality can be alarmed. When the abnormality is cleared, the abnormal LED is turned off and the abnormal output relay is turned off. In this valve actuator, in addition to the above, the same applies to an open-phase abnormality, an undervoltage of a power supply, an indication of screw wear, an abnormality of a battery or an encoder, and a communication abnormality.
[0037]
【The invention's effect】
Since the intelligent valve actuator according to the present invention is configured as described above, the program operation is performed by the control circuit built in the control board, and the status monitoring maintenance, that is, the maintenance maintenance time and the like can be confirmed by the self-diagnosis function. Various settings of devices such as each sensor can be easily performed, and the settings can be reliably performed. This valve actuator is equipped with an absolute encoder and a reversible unit to reduce the number of parts, reduce costs and reduce the failure rate, and can adjust the position limit and torque limit from outside without opening the case. It can be easily performed, the case can be configured to have a non-penetrating structure, water can be prevented from entering the switch section, and the failure rate can be reduced. As for this valve actuator, the conventional valve actuator is constituted by a limit switch transmission unit and a transmission unit to the position meter by a pointer is constituted by mechanical gear transmission, so that the number of parts is increased, and each limit, that is, adjustment of each set value is adjusted. Required special technology, and had to perform regular inspections to check for abnormalities. However, the above-mentioned parts and work became unnecessary. Further, in the conventional valve actuator, the combination of the gears of the speed reducer was complicated in order to convert the total number of rotations of the sleeve shaft into a movement of 0 to 270 °. Since the display is used, the conventional gear device can be eliminated.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing an embodiment of an intelligent valve actuator according to the present invention.
FIG. 2 is a block diagram showing a main part of a control circuit of a drive system of the valve actuator of FIG. 1;
FIG. 3 is a schematic view showing an appearance of the valve actuator of FIG.
FIG. 4 is a schematic view showing an intelligent valve actuator according to the present invention.
FIG. 5 is a sectional view showing an example of a torque sensor provided in the valve actuator.
[Explanation of symbols]
Reference Signs List 1 spindle 2 stem bush 3 housing 4 flow path 5 valve 6 control circuit 7 rotation speed sensor (absolute encoder)
Reference Signs List 8 worm wheel 9 worm 10 male screw 11 female screw 12 motor 16 flow pipe 17 display device (digital)
28 Torque sensor 29 Worm axis 30 Control board 31 Data 32 Current sensor 33, 34 Temperature sensor 35 State output 36 Humidity sensor 37 Vibration sensor 38 Communication unit 39 Setting unit 40 Controller 41 Output 43 Reversing unit 60 Comparator 61 Setting value 62 Display conversion Device 64 wireless monitor 65 personal computer

Claims (9)

A spindle mounted with a valve for opening and closing the flow path and supported vertically movably by a housing, a stem bush provided with a female screw screwed into a male screw provided on the spindle, and rotatably supported by the housing; A valve actuator having a worm wheel fixed to the stem bush and a transmission device having a worm to which rotation from a driving means is transmitted in mesh with the worm wheel in order to rotate the stem bush to vertically move the spindle. At;
A reversible device provided in a motor constituting the driving means; a setting device for presetting an appropriate set value of status data; various sensors for detecting measured values of the status data; and a response to the measured value by the sensor. The measured value and the set value are compared and calculated, and the measured value responds to information deviating from the set value. A display device that displays the measured values and displays processes such as parts replacement, repair, and alarm in response to the information issued from the control circuit; the setting device and the control circuit A control board having a communication unit connected to the display device and the control circuit; and inputting the measured value, the display of the information, and the set value through the communication unit. Intelligent Regent type valve actuator, characterized in that it comprises a; controller to properly control the opening and closing state of the flow path by the valve by operating the driving means while further. The sensor for detecting the status data includes a rotary encoder having an absolute encoder for detecting the number of rotations of the spindle and for integrating the number of rotations in order to detect a valve position and an opening of the flow path of the valve. A number sensor, a torque sensor for detecting a torque applied to the spindle, a temperature sensor for detecting a temperature of an area of the motor serving as the driving means and the control board, a humidity sensor for detecting a humidity inside the valve actuator, A vibration sensor that detects the vibration of the valve actuator, a female screw wear sensor that detects the amount of wear of the female screw of the stem bush using the rotation speed sensor and the torque sensor, and a startup current that drives the motor. 2. The current sensor according to claim 1, further comprising a current sensor for detecting the number of times of operation. Intelligent Regent type valve actuator. The female screw wear sensor determines a gap amount between the male screw and the female screw based on a torque curve obtained according to an axial movement amount of the worm measured by the torque sensor in the control circuit, A rotation speed sensor detects a rotation speed of the stem bush corresponding to the gap amount, and calculates a multiplication of the rotation speed of the stem bush by a pitch of the female screw to detect a wear amount of the female screw. The intelligent valve actuator according to claim 2. 4. The intelligent valve actuator according to claim 1, wherein the controller controls the control circuit of the control board provided in each of the plurality of valve actuators. 5. 5. The intelligent valve actuator according to claim 1, wherein the controller is a personal computer and a wireless remote controller. The LCD according to any one of claims 1 to 5, wherein the display device is an LCD that displays the status data, various setting states of the set values, and various pieces of information on component failure data and abnormalities. An intelligent valve actuator as described. 3. The controller according to claim 1, wherein the controller predicts and controls various information on the life of the sliding part of the component and the life of each seal based on the predetermined state data based on the measured value of the rotation speed sensor. 7. The intelligent valve actuator according to claim 6. 3. The controller according to claim 1, wherein the controller performs predictive control of various types of information on deterioration of components such as a motor and an electronic element as the driving means based on the predetermined state data based on the measured value of the temperature sensor. The intelligent valve actuator according to any one of claims 1 to 7. The controller performs predictive control based on the predetermined state data based on the measured values obtained by the humidity sensor, based on the predetermined state data, based on the measurement values of the heater wiring failure, the cover installation failure, and the state of infiltration into the cover. Item 10. The intelligent valve actuator according to any one of Items 1 to 8.

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