JPS6235101A - Driving controller - Google Patents

Abstract

PURPOSE:To make a structure simple and small-sized and improve positioning accuracy by using a solenoid with its plunger moving up and down, installing a controller under the solenoid so as to position the controller and the solenoid above an air actuator. CONSTITUTION:A solenoid 2 with its plunger 4 moving up and down in almost direct proportion to variation in input signals in to an electric coil is used, and under this solenoid 2 is installed a controller 3 composed of a casing 8, a sleeve 9, and a spool 10. And the sleeve 9 of the controller 3 is put in contact with the output member of an air actuator 30. This contrivance can greatly improve positioning accuracy as well as make the structure simple and small in size, because a complicated feedback mechanism can be eliminated and also accurate movement can be expected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an interlocking drive control device used for a controller that is driven to open and close by an air actuator, and particularly applied to a small controller. .

(Prior Art) As a controller that is driven to open and close by an air actuator, for example, a diaphragm controller is known.

It consists of a controller and a diaphragm-type pneumatic actuator connected to the spindle and operated by supplying and discharging drive air.

However, such a device has the drawbacks of large hysteresis, severe fluctuation in opening due to pressure fluctuations of the fluid being handled, and slow response speed.

For this reason, conventionally, a drive control device having a positioning function and a boosting function is often attached to the pneumatic actuator.

FIG. 2 shows the structure of a conventional positive-acting drive control device 50, the main parts of which are a torque motor 51, a controller 52, and a feedback mechanism 53.

The l.lux motor 51 consists of a terminal 54, an armature 55, a leaf spring 56, and the like.

The controller 52 includes a 7-lap lever 57, a leaf spring 58, a flapper 59, a nozzle 60, a zero adjustment spring 61, a zero adjustment knob 62, a manual switching device 63, and a compensation spring 6.
4, an exhaust device 65, a first air supply device 66, a second air supply device 67, a fixed throttle 68, a sensitivity adjustment screw 69, etc.

The feedback mechanism 53 includes a feedback pin 70,
It consists of a feedback lever 71, a transmission arm 72, a span adjustment lever 73, a lock screw 74, a transmission pin 75, a span adjustment knob 76, a feedback spring 77, and the like.

In addition, 78 is an air actuator, 79 is a movable body (diaphragm), 80 is a chamber, 81 is a control device, and 8
2 is a spindle, and 83 is a return spring.

When the input electrical signal to the terminal 54 of the torque motor 51 increases, the armature 55 swings clockwise about the leaf spring 56 as a fulcrum.

When the armature 55 swings, the flapper lever 57 of the controller 52 swings counterclockwise about the leaf spring 58, increasing the distance between the flapper 59 and the nozzle 60, and reducing the back pressure of the nozzle 60.

When the back pressure in the nozzle 60 decreases, the exhaust device 65 moves to the left and the first air supply device 66 opens, allowing the drive air from the SUP to flow through the second air supply device 66 and into the chamber 80 of the air actuator 78. The movable body 79 moves downward against the return spring 83.

When the movable body 79 moves downward, the stopper (not shown) of the control device 81 moves downward via the spindle 82, and the opening degree of the control device 81 decreases in the closing direction.

When the movable body 79 moves downward, this movement acts on the feedback pin 70, feedback lever 71, transmission arm 72, transmission pin 75, span adjustment lever 73, and feedback spring 77 of the feedback mechanism 53 via the spindle 82. , it is held in a position balanced with the force generated by the input electrical signal.

In other words, the drive control device 50 can control the drive air to the air actuator 78 based on the input electric signal, and can obtain the displacement of the movable body 79 in response to the displacement of the input electric signal.
Highly accurate positioning is possible.

However, in the conventional drive control device 50, the armature 5
5 uses a swinging torque motor 51, the structure is extremely complicated and large.

For this reason, it could only be applied to large controllers.

(Problems to be Solved by the Invention) The present invention was devised in order to solve the problem of sloping tops, and its purpose is to simplify the structure and reduce the size. It is an object of the present invention to provide a drive control device that can be applied to small and compact controllers.

(Means for Solving the Problems) The drive control device of the present invention includes a solenoid that includes an electromagnetic coil and a plunger, and the plunger lowers in approximately direct proportion to an increase or decrease in one word of electricity input to the electromagnetic coil. ; A casing provided below the solenoid, a sleeve that can be raised and lowered relative to the casing and whose lower end is connected to the movable body of the pneumatic actuator, and a sleeve that can be raised and lowered relative to the casing and whose upper end is connected to the plunger of the solenoid. an air source passageway connected to the air source, a chamber passageway connected to the chamber of the air actuator, and an atmosphere passageway connected to the atmosphere, and when the spool moves downward relative to the sleeve, the air source passageway It is characterized in that it is comprised of a controller that allows communication between only the chamber passage and a controller that allows communication between only the chamber passage and the atmospheric passage by moving the spool upward relative to the sleeve.

In other words, it uses a solenoid that moves the plunger up and down.

(Operation) When the input electrical signal to the solenoid increases, the plunger moves downward in response to the amount of increase.

When the plunger moves down, the controller spool moves down relative to the sleeve, leaving only the air source passageway and the chamber passageway in communication.

When the air source passage and the chamber passage communicate, drive air reaches the chamber of the air actuator and moves the movable body downward.

When the movable body moves downward, the sleeve of the controller moves downward relative to the spool, and the air source passage and the chamber passage become disconnected.

As a result, the movable body of the air actuator moves downward in response to the increase in the input electric signal, that is, the downward movement of the plunger of the solenoid, and is held at that position.

Conversely, when the input electrical signal to the slide/id decreases, the plunger moves upward in response to the amount of decrease.

When the plunger moves upward, the spooler of the controller moves upward relative to the sleeve, and only the chamber passage and the atmosphere passage communicate with each other.

When the chamber passage and the atmosphere passage communicate with each other, the air in the chamber of the air actuator is released to the atmosphere, causing the movable body to move upward.

When the movable body moves up, the sleeve of the controller moves up relative to the spool, causing the chamber passage and the atmospheric passage to be disconnected from each other.

As a result, the movable body of the air actuator moves upward in response to the amount of decrease in the input electrical signal, that is, the amount of upward movement of the plunger of the solenoid, and is held at that position.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a longitudinal sectional view showing the structure of a drive control device according to an embodiment of the present invention.

The main parts of the drive control device 1 include a solenoid 2 and a controller 3.

The solenoid 2 includes an electromagnetic coil and a plunger 4, and the plunger 4 descends in approximately direct proportion to an increase or decrease in an electric signal input to the electromagnetic coil.

In this example, a solenoid case 5, an electromagnetic coil (not shown) provided inside the solenoid case 5, a plunger 4 provided below from inside the solenoid case 5 and raised and lowered, and a spring holder 6 provided below the plunger 4. and a solenoid spring 7 which is interposed between the controller 3 and the spring holder 6 and biases the plunger 4 upward.

The solenoid 2 is of a bush type in which the plunger 4 moves downward in response to an input electric signal being applied to the electromagnetic coil, and the displacement of the input electric signal is controlled by a controller connected to the electromagnetic coil. (not shown).

The controller 3 includes a casing 8 provided below the solenoid 2, a sleeve 9 that can be raised and lowered with respect to the casing 8 and whose lower end is connected to a movable body 31 of an air actuator 30, and a sleeve 9 that can be raised and lowered with respect to the casing 8 and whose lower end is connected to the movable body 31 of the air actuator 30. A spool 10 whose upper end is connected to the plunger 4 of the solenoid 2, an air source passage 11 connected to an air source (not shown), a chamber passage 12 connected to the chamber 32 of the air actuator 30, and an atmospheric passage 13 connected to the atmosphere. When the spool IO moves downward with respect to the sleeve 9, only the air source passage 11 and the chamber passage 12 communicate with each other, and when the spool 10 moves upward with respect to the sleeve 9, the chamber passage 12 and Only the atmospheric passage 13 can communicate with it.

The controller 3 is interposed between the upper solenoid 2 and the lower pneumatic actuator 30.

In this example, the casing 8 is interposed and fixed between the solenoid 2 and the air actuator 30, and has an upper chamber 14 and a lower chamber 1.
5, a vertical cavity 16 that connects these, a circumferential groove 17 provided in the middle of this, and an atmospheric passage 1 that communicates the middle right surface with the upper chamber 14.
3, and an air source passage 11 that communicates between the middle left surface and the circumferential groove 17.
It is equipped with

In this example, the sleeve 9 includes a cap 18, an outer tube 19 connected thereto, and an inner tube 2 fitted inside the cap.
0, an inner cavity 21 which is opened upwardly is formed, and a passage 22 reaching the outer surface from the interior cavity 21 is formed in the middle, and below the passage 22, a passage 22 is formed from the interior cavity 21 to the lower chamber 1.
A chamber passage 12 reaching 5 is formed.

The sleeve 9 is fitted into the vertical cavity 16f of the casing 8 so as to be able to be raised and lowered, and 011 rings 23 are interposed at two upper and lower positions between the sleeve 9 and the casing 8.
A sleeve spring 24 is interposed between the sleeve 9 and the casing 8 to bias the sleeve 9 downward.

In this example, the spool 10 has two enlarged diameter portions on the upper and lower sides, and has a continuous hole 25 in the center extending from the lower surface to the upper side surface, so that the spool 10 can be freely raised and lowered into the inner cavity 21 of the sleeve 9. It is inserted.

The upper end of the spool 10 is joined to the lower end of the spring holder 6 of the solenoid 2, and a spool spring 26 is interposed between the spool 10 and the sleeve 9 to bias the spool 10 upward. There is.

The air actuator 30 includes a movable body 31 operated by driving air and a chamber 32 into which the driving air is introduced.

In this example, the movable body 31 is formed into a diaphragm and is provided on the upper part of the casing 41 of the control device 40, and two parts of the spindle 42 of the control device 40 are connected to the movable body 31 and are movable. Body 31 and controller casing 8
A chamber 32 is formed between the lower chamber 15 and the lower chamber 15 .

Thus, the lower end of the sleeve 9 of the control valve 3 is joined to the upper end of the spindle 42 of the control device 40.

The control device 40 includes a stopper (
(not shown), the opening degree of which increases in the opening direction as it moves downward, and a return spring is provided between the housing 41 and the spindle 42 that urges the spindle 42 upward. 43 are provided.

Next, the operation will be explained based on such a configuration.

An input electric signal from the controller is applied to the electromagnetic coil of the solenoid 2, and driving air from an air source is introduced into the air source passage 11 of the controller 3.

As the input electrical signal increases, solenoid spring 7
Against this, the plunger 4 moves downward in approximately direct proportion to the amount of increase in the input electrical signal.

When the plunger 4 moves downward by a predetermined amount, the spool 10 first moves downward by the same amount relative to the sleeve 9 due to the spool spring 28.

Then, the chamber passage 12, which had been blocked by the spool 10, is opened, and the driving air from the air source flows through the air source passage 11 → circumferential groove 17 → passage 22 → inner cavity 21 - chamber passage 12 - lower chamber. 15→The chamber 32 is reached, the movable body 31 is pushed down by the pressure, the spindle 42 is moved downward, and the control device 40 is opened to a predetermined opening degree in the closing direction.

When the movable body 31 is pushed down, the sleeve 9 of the controller 3 is moved downward relative to the casing 8 and the spool 10 by the sleeve spring 26, and the chamber passage 1 of the sleeve 9 is moved downward.
2 is again blocked by the spool 10, so that the air source passage 11 and the chamber passage 12 become disconnected from each other.

As a result, the amount of increase in the input electrical signal, i.e., solenoid 2
The pneumatic actuator 3 responds to the downward movement of the plunger 4.
0 and is held at that position, and the control device 40 is also held at a predetermined opening position.

Conversely, when the input electrical signal to the solenoid 2 decreases, the plunger 4 moves upward in response to the amount of decrease.

When the plunger 4 moves upward, the spool 10 of the controller 3 moves upward relative to the sleeve 9, and only the chamber passage 12 and the atmosphere passage 13 communicate with each other.

Then, the air in the chamber 32 of the air actuator 30 flows from the chamber passage 12 to the inner lumen 21 through the series of holes 25-+the upper chamber 1.
4→Open to the atmosphere through the atmospheric passage 13, and move the movable body 31 upward.

When the movable body 31 moves upward, the sleeve 9 of the controller 3 moves upward relative to the casing 8 and the spool 10, thereby disconnecting the chamber passage 12 and the atmospheric passage 13.

As a result, the amount of decrease in the input electrical signal, i.e., solenoid 2
The pneumatic actuator 3 responds to the upward movement of the plunger 4.
The lower moving body 31 of 0 moves upward and is maintained at that position,
Control device 40 is also held at a predetermined opening position.

Although the air actuator 30 is of a diaphragm type in the previous embodiment, it is not limited to this, and may be, for example, a single-acting air cylinder.

(Effects of the Invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) In addition to using a solenoid that moves the plunger up and down, a controller is provided below the solenoid, and these are placed above the air actuator to match each movement with the up and down direction, so compared to conventional drive control devices, A complicated feedback mechanism can be omitted, the structure can be greatly simplified, and the size can be reduced, so that it can be easily applied to a small controller.

(2) In addition to using a solenoid that moves the plunger up and down, a controller is provided below the solenoid, and these are placed above the air actuator to match each movement with the up and down direction, so accurate movement can be expected and positioning Accuracy can be greatly improved.

(3) Since the structure can be simplified and miniaturized, the weight can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the structure of a drive control device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the structure of a conventional drive control device. 1... Drive control device 2... Solenoid 3... Controller

Claims (1)

[Claims] a solenoid comprising an electromagnetic coil and a plunger, the plunger of which descends in approximately direct proportion to an increase or decrease in an electric signal input to the electromagnetic coil; a casing provided below the solenoid; a sleeve connected to the movable body of the air actuator, a spool that can be raised and lowered relative to the sleeve and whose upper end is connected to the plunger of the solenoid, an air source passage connected to the air source, and a chamber passage connected to the chamber of the air actuator. and an atmospheric passage connected to the atmosphere, and when the spool moves downward relative to the sleeve, only the air source passage and the chamber passage communicate with each other, and when the spool moves downward relative to the sleeve, the chamber passage communicates with the air source passage. and a controller with which only an atmospheric passage can communicate.