JP4461002B2 - Electro-pneumatic regulator - Google Patents

Description

  The present invention relates to an electropneumatic regulator that can adjust a fluid pressure output from an output port steplessly.

  The electropneumatic regulator is a pressure adjusting device having a function of steplessly adjusting a fluid pressure output from an output port based on a preset pressure set in advance from the outside. In other words, the electropneumatic regulator drives the booster that adjusts and outputs the pressure of the compressed air that is input, the solenoid valve that controls the pilot pressure of the booster, the valve control circuit that controls the opening and closing of the solenoid valve, and the valve control circuit And a controller.

  In such an electropneumatic regulator, the operation of the valve control circuit is controlled based on a set pressure preset in the controller, and the solenoid valve is controlled to open and close by the valve control circuit to control the pilot pressure of the booster. And the pressure output from a booster is adjusted based on control of pilot pressure.

The set pressure set in the controller is usually input from an external input device to the controller via a cable.
Patent Document 1 discloses a similar configuration of an electropneumatic regulator.
JP-A-10-96407

  In the electropneumatic regulator as described above, since the main body side connector for connecting the cable is fixed to the main body, the fitting direction of the cable with respect to the main body side connector is limited to one direction.

  Then, when changing the take-out direction of the cable connected to the main unit side connector by changing the installation position of the electropneumatic regulator, it is necessary to use a cable with a different cable side connector opening direction provided at the end of the cable. is there.

  That is, when a cable is taken out along the opening direction of the main body side connector, it is necessary to use a cable in which the cable side connector opens along the axial direction of the cable. Further, when a cable is taken out in a direction orthogonal to the opening direction of the main body side connector, it is necessary to use a cable in which the cable side connector opens in a direction orthogonal to the axial direction of the cable.

  Therefore, depending on the direction in which the cable is taken out, it is necessary to prepare a cable with a different opening direction of the cable side connector. Further, when a cable corresponding to the installation position cannot be prepared, there is a problem that the installation position is restricted.

  An object of the present invention is to provide an electropneumatic regulator capable of improving the degree of freedom of installation position without changing a cable.

  The object is achieved by an electropneumatic regulator in which a connector for connecting a cable is rotatably supported on a case.

  ADVANTAGE OF THE INVENTION According to this invention, the electropneumatic regulator which can improve the freedom degree of an installation position can be provided, without changing a cable.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. The electropneumatic regulator shown in FIG. 1 is provided with an output port 2 at the lower part of one side of the case 1 and a supply port 3 to be described later at the lower part of the other side of the case 1. Then, the pressure of the compressed air supplied to the supply port 3 is adjusted and output from the output port 2.

  A digital display 4 is provided at the upper front of the case 1, and three operation keys are provided below it. The operation keys are composed of a SET key 5, a SHIFT key 6, and a selection key 7.

  A D-sub connector 8 is rotatably supported on the upper rear portion of the case 1. That is, as shown in FIG. 2, the support shafts 9 are protruded on both sides of the connector 8, and the bearing portion 10 is formed on the upper side of the case 1 so that the support shaft 9 can be inserted from above. ing. When the support shaft 9 is inserted into the bearing portion 10, the connector 8 rotates with respect to the case 1 within a range of 90 degrees from the state in which the opening portion faces rearward to the state in which the opening portion faces upward as shown in FIG. Supported as possible.

  The upper lid 11 of the case 1 is formed in a flat plate shape, and a cutout portion 12 is formed at the rear portion so as not to hinder the rotation of the connector 8. Holding pieces 13 of the connector 8 are extended on both sides of the cutout portion 12, and hook portions 14 extending rearward are provided on the lower surface of the holding piece 13.

  Then, as shown in FIG. 3, the rear portion of the upper lid 11 is held by the bearing portion 10 and cannot be moved upward by allowing the hook portion 14 to go under the bearing portion 10. Accordingly, in this state, the upward movement of the support shaft 9 from the bearing portion 10 is prevented.

  An insertion hole 16 for inserting a screw 15 is formed in the front portion of the upper lid 11, and the screw 15 inserted through the insertion hole 16 is screwed into the screw hole 15 a of the case 1, thereby The front part is fixed to the case 1.

Next, a regulator housed in the case 1 and an electrical configuration for controlling the regulator will be described with reference to FIG.
The compressed air supplied to the supply port 3 is supplied to the booster 17 and the air supply valve 18 that controls the pilot pressure of the booster 17. The air supply valve 18 and the exhaust valve 19 are controlled by a valve control circuit 20 and control of the compressed air supplied to the booster 17 through the air supply valve 18 and the flow rate of the compressed air discharged to the atmosphere through the exhaust valve 19. Based on the above, the pilot pressure of the booster 17 is controlled. The booster 17 outputs compressed air having a pressure corresponding to the pilot pressure from the output port 2.

  The valve control circuit 20 is controlled by a controller 21. The controller 21 includes a CPU (calculation means) 22 and a non-volatile memory (storage means) 23. The non-volatile memory 23 stores various parameters necessary for pressure control and a set pressure in the direct memory input control mode. The

  An input signal generator 24 is connected to the controller 21 via a cable connected to the connector 8. The CPU 22 controls the valve control circuit 20 based on the setting signal output from the input signal generator 24 in the external input control mode. In the direct memory input control mode, the valve control circuit 20 is controlled based on the set pressure stored in the nonvolatile memory 23.

  Further, the controller 21 is connected to the display unit 25 including the digital display unit 4 and the keys 5, 6, and 7. The display operation unit 25 is housed in the case 1 and outputs various set values such as a set pressure input by operating the keys 5, 6 and 7 to the controller 21. In the controller 21, the input set value is stored in the nonvolatile memory 23.

Further, the controller 21 displays the input set value or various display values on the digital display unit 4 of the display operation unit 25.
An external output device 26 is connected to the controller 21. Then, the controller 21 outputs a monitor signal, an error signal, or various output signals to the external output device 26.

A pressure sensor 27 that detects the output pressure of the output port 2 is provided in the case 1, and a detection signal is output to the controller 21.
An external sensor 28 is connected to the controller 21 and a detection signal from the external sensor 28 is input.

  Next, a method for setting the set pressure by the display operation unit 25 will be described with reference to FIG. When power is supplied via the cable connected to the connector 8, the CPU 22 reads the stored contents of the nonvolatile memory 23 (step 1), and then determines the input specifications (step 2).

  In step 2, based on the operation of the SET key 5 and the selection key 7, either the direct memory input specification or the external input specification is selected. The direct memory input specification is a specification for performing pressure control based on a set value input from the display operation unit 25, and the external input specification is for performing pressure control based on the set pressure input from the input signal generator 24. It is a specification.

  When the direct memory input specification is selected, the direct memory input for performing the pressure control operation based on the set pressure input from the display operation unit 25 and stored in the nonvolatile memory, that is, the set pressure read in step 1 Control mode is entered (step 3).

  Here, when the selection key 7 is pressed to change the set pressure, the mode shifts to the direct memory set value display mode, and the set set value is displayed on the digital display unit 4 (step 4). When the SET key 5 is further pressed, the mode shifts to the direct memory set value change mode, and the set value can be changed (step 5).

  In step 5, the set value increases every time the selection key 7 is pressed (step 6). In step 5, the set digit is changed every time the SHIFT key 6 is pressed (step 7). Therefore, the setting values of a plurality of digits can be arbitrarily adjusted by operating the selection key 7 and the SHIFT key 6.

  In step 5, when the SET key 5 is pressed, the set value is confirmed and the process returns to step 4. When the selection key 7 is pressed in step 4, the process proceeds to step 3 and control based on the newly set pressure is performed. Is done.

When the external input specification is selected in step 2, the process shifts to the external input control mode, and control based on the set value input from the input signal generator 24 is performed (step 8).
In the electropneumatic regulator configured as described above, when operating in the direct memory input control mode, the setting value input by the operation of the display operation unit 25 as described above is stored in the nonvolatile memory 23 and the setting is performed. The valve control circuit 20 is driven based on the value, and the output pressure is controlled.

When operating in the external input control mode, the valve control circuit 20 is driven based on the set value input from the input signal generator 24 to control the output pressure.
When operating in either the direct memory input control mode or the external input control mode, the valve control circuit 20 is configured so that the output pressure matches the set value based on the detection signal of the pressure sensor 27 or the external sensor 28. The operations of the air supply valve 18 and the exhaust valve 19 are controlled via the.

With the electropneumatic regulator configured as described above, the following operational effects can be obtained.
(1) The set value of the output pressure can be input from either the external input signal generator 24 or the display operation unit 25. Accordingly, since it is possible to set and operate the temporary setting value by the display operation unit 25, even when the input signal generator 24 cannot be prepared, the operation check of the pneumatic system including the electropneumatic regulator can be performed. it can.
(2) Since the connector 8 is supported so as to be rotatable within a range of 90 degrees with respect to the case 1, as shown in FIG. 1 and FIG. But you can connect the cable. Therefore, even if the cable connection direction changes by 90 degrees, it is not necessary to change the cable.
(3) Since the connector 8 is a general-purpose D-sub type, it can be connected to the input signal generator 24 using a general-purpose cable. Accordingly, the cable can be easily procured or supplemented.
(4) When the connector on the cable side is pulled out from the connector 8 with the connector 8 opened toward the rear of the case 1, the support shaft 9 of the connector 8 is held by the bearing portion 10 opened only upward. The connector 8 can be prevented from falling off from the case 1.
(5) Since the support shaft 9 of the connector 8 is held by the holding piece 13 of the upper lid 11 when the connector on the cable side is pulled out from the connector 8 with the connector 8 opened upward from the case 1, the connector 8 8 from the case 1 can be prevented.
(6) The rear portion of the upper lid 11 is prevented from moving upward by engaging the hook portion 14 provided on the lower surface of the holding piece 13 with the bearing portion 10. Therefore, even if an upward force is applied to the upper lid 11 via the support shaft 9, the rear portion of the upper lid 11 does not come off from the case 1.
(7) Since the rear portion of the upper lid 11 is held by the case 1 by the hook portion 14, there is no need to screw it. Accordingly, it is not necessary to secure a space for screwing in the rear portion of the upper lid 11 and the case 1, and thus the case 1 can be reduced in size.

You may implement the said embodiment in the following aspects.
-You may make it the connector 8 rotate between the side surface direction of the case 1, and upper direction.

It is a perspective view which shows the electropneumatic regulator of one embodiment. It is a disassembled perspective view which shows the attachment part of a connector. It is sectional drawing which shows the attachment part of a connector. It is a perspective view which shows the state which rotated the connector. It is a block diagram which shows the electric constitution of an electropneumatic regulator. It is a flowchart which shows operation | movement to the setting value of an electropneumatic regulator.

Explanation of symbols

1 Case 5 Operation keys (SET key)
6 Operation keys (SHIFT key)
7 Operation keys (selection keys)
DESCRIPTION OF SYMBOLS 8 Connector 9 Support shaft 10 Bearing part 11 Upper cover 14 Hook part 23 Non-volatile memory 24 Input signal generator 25 Display operation part

Claims (3)

An electropneumatic regulator that supports a connector for connecting a cable to a case so as to be rotatable ,
The support shafts provided at both ends of the connector are rotatably supported by bearing portions provided so as to open upward in the case,
A holding piece is extended on both sides of a cut portion formed so as not to hinder the rotation of the connector at the rear portion of the upper lid of the case, and the holding piece is supported by the bearing so that the support shaft is held by the bearing portion. Located above the section,
An electropneumatic regulator characterized in that a hook portion that engages below the bearing portion is provided on the lower surface of the holding piece, and the upper lid is positioned in the vertical direction with respect to the case . In the case,
Arithmetic means for processing a set value of output pressure input from the outside via the connector;
The electropneumatic regulator according to claim 1 , further comprising: a display operation unit that allows an input value of the output pressure to be input based on an operation of an operation key provided on the surface of the case. The connector, pneumatic regulator electrodeposition according to claim 1 or 2, characterized in that a D-sub type.

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