JP5548009B2 - Pressure control device - Google Patents

Description

  The present invention is provided with a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure, and a pressure setting unit that changes and sets the set pressure of the pressure control valve, and the pressure setting unit includes a spring A pressure setting spring capable of changing and setting the set pressure by adjusting a load, a rotation output shaft capable of rotating a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring, and a drive for rotating the rotation output shaft The present invention relates to a pressure control device including a motor and a control unit that controls the operation of the drive motor.

The pressure control device as described above is provided in a fluid flow path such as a gas conduit for supplying city gas to each consumer, and adjusts the secondary side pressure to a desired set pressure. When city gas is supplied to each consumer through the gas conduit, the set pressure is set according to the load so that the pressure of the city gas supplied to each consumer is within a desired range even if the load fluctuates. It is required to change settings.
Therefore, the pressure setting unit of the pressure control device adjusts the spring load applied to the pressure setting spring by driving the rotation output shaft to rotate by the drive unit, thereby adjusting the spring load applied to the pressure setting spring. It is configured to automatically change settings.

  For example, the set pressure of the pressure control valve needs to be changed and set to a target set pressure according to the load, etc., so a potentiometer that detects the rotation position of the rotation output shaft is provided, and the rotation position detected by the potentiometer is A control unit that controls the operation of the drive motor is provided so as to achieve a target rotation position corresponding to the target set pressure (see, for example, Patent Document 1).

As described above, the control unit controls the operation of the drive motor to adjust the rotation position of the rotation output shaft to a desired rotation position. For example, the rotation is caused by a runaway of the control unit or a failure of the drive motor. There is a possibility that the output shaft will be excessively rotated, causing problems such as damage to the potentiometer.
Therefore, in the apparatus described in Patent Document 1, in order to prevent excessive rotation of the rotation output shaft, a movable member that can move up and down in conjunction with the rotation of the rotation output shaft is brought into contact with the movable member. The upper side movement restricting member (stopper bolt) for restricting the upward movement of the moving member and the lower side movement restricting member for restricting the downward movement of the moving member by contacting the moving member ( Bearing member). Accordingly, when the rotation output shaft is excessively rotated to the increase side or the decrease side beyond the proper rotation range, the moving member comes into contact with the upper side movement restricting member or the lower side movement restricting member, and the moving member is thereby brought into contact with the moving member. By restricting the movement of the rotation output shaft, excessive rotation of the rotation output shaft is prevented.

JP 2002-116825 A

  In the apparatus described in Patent Document 1, since the moving member is in contact with the upper side movement restricting member or the lower side movement restricting member to prevent excessive rotation of the rotation output shaft, the upper side movement restricting member and The lower side movement restricting member must receive the force by which the moving member moves and restrict the movement of the moving member. Therefore, the upper side movement restricting member and the lower side movement restricting member are required to have a strong strength enough to receive the moving force of the moving member. The structures of the upper side movement restricting member and the lower side movement restricting member are the same. It becomes large or complicated, leading to complication and enlargement of the configuration.

If the rotation output shaft is excessively rotated due to a runaway control unit or a drive motor failure, the rotation output shaft is driven to rotate by the drive motor. Therefore, a large force corresponding to the drive force of the drive motor is required. Is applied to the upper side movement restricting member and the lower side movement restricting member, and the structure becomes larger correspondingly, and the problem of enlargement becomes remarkable.
In addition, since the force corresponding to the driving force of the drive motor is received by the upper movement restriction member or the lower movement restriction member, an unnecessary load is applied to the drive motor, which is preferable from the viewpoint of the drive motor load. is not.

  The present invention has been made paying attention to such a point, and the object thereof is to simplify and reduce the size of the structure, and while preventing an unnecessary load from being applied to the drive motor, The object is to provide a pressure control device capable of preventing excessive rotation.

In order to achieve this object, the characteristic configuration of the pressure control device according to the present invention includes a pressure control valve that adjusts the secondary side pressure of the fluid flow path to a set pressure, and changes and sets the set pressure of the pressure control valve. The pressure setting unit rotates a pressure setting spring capable of changing and setting the set pressure by adjusting a spring load and a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring. In a pressure control device comprising a free rotation output shaft, a drive motor that rotationally drives the rotation output shaft, and a control unit that controls the drive amount of the drive motor,
A reference speed reduction mechanism that decelerates the rotation of the rotation output shaft and transmits it to the speed reduction rotation shaft, and a speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is switched to an operating state when rotated to an excessive rotation position. A switch unit, and a drive motor stop unit that stops driving the drive motor as the switch unit is switched to an operating state, and the excessive rotation position causes the rotation output shaft to rotate beyond an appropriate rotation range. As it is done, it is set to a position to switch the switch part to the operating state ,
The speed reduction gear is provided with a switching operation section that can switch the switch section to an operating state as the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position. The reduction gear of the reference reduction mechanism or the reduction rotation shaft rotates beyond the excessive rotation position by the contact between the switching operation portion and the contact body fixed to the storage case side of the pressure control device. It is in the point which is constituted so that it may regulate .

According to this feature configuration, the excessive rotation position is set to a position where the switch unit is switched to the operating state as the rotation output shaft is rotated beyond the proper rotation range. When the rotation output shaft is rotated beyond the proper rotation range due to a failure of the drive motor or the like, the switch unit is switched to the operating state. At this time, the drive motor stopping means stops driving the drive motor as the switch unit is switched to the operating state. Therefore, when the rotation output shaft is rotated beyond the proper rotation range, the drive motor is stopped. Excessive rotation of the rotation output shaft can be prevented.
Here, as for the switch part, if the switch part is normally in the ON state, when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position, it is prepared to be switched from the ON state to the OFF state. In such a switch unit, the OFF state is the operating state. Conversely, if the switch unit is normally in the OFF state, it can be provided to be switched from the OFF state to the ON state when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position. It can be in an operating state.

  Then, the switch unit and the drive motor stop means are provided, and the drive motor is stopped to prevent excessive rotation of the rotation output shaft, so that the upper side movement restriction that restricts the movement of the moving member as in the prior art. Since there is no need to provide a member or a lower side movement restricting member, the structure of the upper side movement restricting member or the lower side movement restricting member does not become large or complicated, and the structure is simplified and compact. Can be achieved. In addition, since the drive motor itself is stopped, unnecessary load on the drive motor can be prevented. Therefore, it is possible to realize a pressure control device that can simplify and reduce the size of the configuration, and can prevent excessive rotation of the rotary output shaft while preventing an unnecessary load from being applied to the drive motor.

According to a further characteristic configuration of the pressure control device according to the present invention, the switch unit is in an OFF state as an operation state when the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position. The power cut-off switch unit is configured to be able to cut off the supply of drive power to the drive motor as it is switched to the OFF state, and the drive motor stop means is connected to the power cut-off switch unit. is composed Te,
The switching operation portion is formed with two grooves extending along the rotation direction of the reduction gear, closed at one end and opened at the other end,
The rod-shaped contact body fixed to the storage case side of the pressure control device is detachably disposed with respect to the groove portion by rotation of the speed reduction gear,
The switching operation unit is
As the reduction gear of the reference reduction mechanism or the reduction rotation shaft is rotated to the excessive rotation position.
The power cut-off switch unit is pressed by the radially outer side surface of the reduction gear of the switching operation unit to switch to the operating state, and the contact body and the closed end side wall of the groove unit are in contact with each other. This is to restrict the rotation of the reduction gear .

According to this characteristic configuration, the power cut-off type switch unit that is normally in the ON state as the switch unit and is switched from the ON state to the OFF state when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position. However, since the drive motor stop means is composed of the power cut-off switch section, the switch cut-off switch section and the drive motor stop means are combined in the power cut-off switch section. Therefore, the configuration can be simplified. In addition, the power cut-off switch unit cuts off the supply of drive power to the drive motor as the rotation output shaft rotates beyond the proper rotation range, so that the drive motor can be reliably stopped. Thus, excessive rotation of the rotation output shaft can be reliably prevented. In addition, the drive motor is not stopped by the control of the control unit, but the drive motor is stopped by switching the power cut-off switch unit to the OFF state and shutting off the supply of drive power to the drive motor. The drive motor can be reliably and accurately stopped without being affected by software bugs or substrate defects. In addition, when the speed reduction gear or the speed reduction rotation shaft of the reference speed reduction mechanism is rotated to the excessive rotation position, the switching operation part provided in the speed reduction gear switches the switch part to the operating state. The switching to can be performed accurately.

Another characteristic configuration of the pressure control device according to the present invention includes : a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure; and a pressure setting unit that changes and sets the set pressure of the pressure control valve. The pressure setting unit is provided with a pressure setting spring capable of changing and setting the set pressure by adjusting a spring load, and a rotary output shaft capable of rotating a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring. A pressure control device comprising: a drive motor that rotationally drives the rotation output shaft; and a control unit that controls a drive amount of the drive motor,
A reference speed reduction mechanism that decelerates the rotation of the rotation output shaft and transmits it to the speed reduction rotation shaft, and a speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is switched to an operating state when rotated to an excessive rotation position. A switch unit, and a drive motor stop unit that stops driving the drive motor as the switch unit is switched to an operating state, and the excessive rotation position causes the rotation output shaft to rotate beyond an appropriate rotation range. As it is done, it is set to a position to switch the switch part to the operating state,
The switch unit is switched to an OFF state as an operation state when the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position, and the drive is switched as the state is switched to the OFF state. The power cut-off switch unit is configured to be able to cut off the supply of drive power to the motor, and the drive motor stop means is formed of the power cut-off switch unit.
The speed reduction gear is provided with a switching operation section that can switch the switch section to an operating state as the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position.
When the switching operation portion comes into contact with a contact body fixed to the storage case side of the pressure control device, the reduction gear of the reference reduction mechanism or the reduction rotation shaft rotates beyond the excessive rotation position. It is in the point which is constituted so that it may regulate .

According to this feature configuration, the excessive rotation position is set to a position where the switch unit is switched to the operating state as the rotation output shaft is rotated beyond the proper rotation range. When the rotation output shaft is rotated beyond the proper rotation range due to a failure of the drive motor or the like, the switch unit is switched to the operating state. At this time, the drive motor stopping means stops driving the drive motor as the switch unit is switched to the operating state. Therefore, when the rotation output shaft is rotated beyond the proper rotation range, the drive motor is stopped. Excessive rotation of the rotation output shaft can be prevented.
Here, as for the switch part, if the switch part is normally in the ON state, when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position, it is prepared to be switched from the ON state to the OFF state. In such a switch unit, the OFF state is the operating state. Conversely, if the switch unit is normally in the OFF state, it can be provided to be switched from the OFF state to the ON state when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position. It can be in an operating state.
Then, the switch unit and the drive motor stop means are provided, and the drive motor is stopped to prevent excessive rotation of the rotation output shaft, so that the upper side movement restriction that restricts the movement of the moving member as in the prior art. Since there is no need to provide a member or a lower side movement restricting member, the structure of the upper side movement restricting member or the lower side movement restricting member does not become large or complicated, and the structure is simplified and compact. Can be achieved. In addition, since the drive motor itself is stopped, unnecessary load on the drive motor can be prevented. Therefore, it is possible to realize a pressure control device that can simplify and reduce the size of the configuration, and can prevent excessive rotation of the rotary output shaft while preventing an unnecessary load from being applied to the drive motor.
Further, the switch unit is normally in an ON state, and includes a power cut-off type switch unit that is switched from the ON state to the OFF state when the reduction gear or the reduction rotation shaft is rotated to the excessive rotation position. However, since the drive motor stop means is constituted by the power cutoff type switch part, the configuration of the switch part and the configuration of the drive motor stop means can be shared by the power cutoff type switch part. Simplification can be achieved. In addition, the power cut-off switch unit cuts off the supply of drive power to the drive motor as the rotation output shaft rotates beyond the proper rotation range, so that the drive motor can be reliably stopped. Thus, excessive rotation of the rotation output shaft can be reliably prevented. In addition, the drive motor is not stopped by the control of the control unit, but the drive motor is stopped by switching the power cut-off switch unit to the OFF state and shutting off the supply of drive power to the drive motor. The drive motor can be reliably and accurately stopped without being affected by software bugs or substrate defects.
In addition, when the speed reduction gear or the speed reduction rotation shaft of the reference speed reduction mechanism is rotated to the excessive rotation position, the switching operation part provided in the speed reduction gear switches the switch part to the operating state. The switching to can be performed accurately.

  A further characteristic configuration of the pressure control device according to the present invention includes a first rotation position detection sensor that detects a rotation position of the reduction rotation shaft, a second rotation position detection sensor that detects a rotation position of the rotation output shaft, The number of rotations of the rotation output shaft is obtained based on the detection information of the first rotation position detection sensor, and the rotation angle of the rotation output shaft is obtained based on the detection information of the second rotation position detection sensor. And a rotational position calculating means for obtaining a rotational position of the rotational output shaft from the rotational speed and rotational angle of the rotational output shaft.

  According to this characteristic configuration, when the rotation output shaft rotates once, the rotation of the rotation output shaft can be decelerated by the reference speed reduction mechanism so that the deceleration rotation shaft rotates by a predetermined angle. The rotational position of the deceleration rotary shaft detected by the first rotational position detection sensor is the rotational speed of the rotational output shaft that has been decelerated by the reference deceleration mechanism. The rotation speed of the rotation output shaft can be obtained from the rotation position of the deceleration rotation shaft detected by the one rotation position detection sensor. When the rotation position of the rotation output shaft is detected by the second rotation position detection sensor, the rotation angle of the rotation output shaft can be obtained as it is from the rotation position of the rotation output shaft. Since the rotation position of the rotation output shaft is detected as it is by the second rotation position detection sensor, the rotation angle of the rotation output shaft can be detected without reducing the resolution.

  Thus, the rotational position calculation means can obtain the rotational speed of the rotational output shaft based on the detection information of the first rotational position detection sensor, and also the rotational output shaft based on the detection information of the second rotational position detection sensor. Therefore, the rotational position of the rotation output shaft can be determined finely and appropriately from the determined rotation speed and rotation angle of the rotation output shaft. Therefore, the control unit controls the operation of the drive unit so that the rotation position of the rotation output shaft obtained in this way by the rotation position calculation means becomes the target rotation position, thereby setting the set pressure of the pressure control valve to the target. The set pressure can be accurately changed.

  Moreover, the reference deceleration mechanism decelerates the rotation of the rotation output shaft and transmits it to the deceleration rotation shaft. The deceleration rotation shaft detects that the rotation output shaft has been rotated beyond the proper rotation range. It is also used for obtaining the rotational speed of the rotary output shaft. Therefore, the reduction rotation shaft is used for two applications, and the configuration can be simplified accordingly.

  A further characteristic configuration of the pressure control device according to the present invention is that the reference deceleration mechanism is constituted by a worm deceleration mechanism.

  According to this characteristic configuration, the reference speed reduction mechanism is configured by the worm speed reduction mechanism, so that the installation space for the reference speed reduction mechanism can be reduced, and the space can be saved as the apparatus.

Overall schematic diagram of pressure control device Schematic perspective view of pilot valve and pressure setting unit Schematic sectional view of pilot valve and pressure setting part Perspective view showing a part of the pressure setting section Perspective view showing a part of the pressure setting section The figure which shows the state before a switch part is switched to an operation state The figure which shows a state when a switch part is switched to an operation state

An embodiment of a pressure control device according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the pressure control device includes a pressure control valve 2 that adjusts the secondary pressure of the fluid flow path 1 to a set pressure, and a pressure setting unit 3 that changes and sets the set pressure of the pressure control valve 2. And is configured. The pressure control device is provided with a pilot valve 4 that supplies a drive pressure to the pressure control valve 2 so that the secondary pressure of the fluid flow path 1 becomes a set pressure. By adjusting 4, the set pressure of the pressure control valve 2 is changed and set.

  Here, although illustration is omitted, for example, by branching the downstream side of the pressure control valve 2 of the fluid flow path 1 into a plurality of branch paths and connecting each of the plurality of branch paths to each consumer, It is configured to supply a fluid such as natural gas to a plurality of consumers. The secondary pressure on the downstream side of the pressure control valve 2 is adjusted to a set pressure lower than the primary pressure on the upstream side.

  The pressure control valve 2 includes a first diaphragm D1, and the internal space is partitioned into a first chamber H1 and a second chamber H2 by the first diaphragm D1. The pressure control valve 2 includes a first valve body B1 that opens and closes the fluid flow path 1, and the first valve body B1 is configured to be opened and closed by a first diaphragm D1. The first chamber H1 is provided with a first biasing spring G1 that biases the first diaphragm D1 toward the valve closing direction of the first valve body B1.

  The pilot valve 4 includes a second diaphragm D2 and a third diaphragm D3, and the internal spaces of the second diaphragm D2 and the third diaphragm D3 are the third chamber H3, the fourth chamber H4, and the fifth chamber H5. It is divided into. The third chamber H3 is communicatively connected to the secondary side of the fluid flow path 1 (downstream side from the pressure control valve 2) by the first secondary pressure introduction path 5, and the second secondary pressure The introduction path 6 is connected to the first chamber H1 of the pressure control valve 2 in communication. The fourth chamber H4 is connected to the primary side (upstream side of the pressure control valve 2) of the fluid flow path 1 by the primary pressure introduction path 7 and is connected to the pressure control valve 2 by the driving pressure introduction path 8. The two rooms H2 are connected in communication. Although not shown, the second diaphragm D2 and the third diaphragm D3 are connected by a connecting portion or the like, and are configured to be integrally displaceable up and down. A second urging spring G2 is disposed in the fifth chamber H5. The second urging spring G2 urges the third diaphragm D3 toward the fourth chamber H4, whereby the second diaphragm D2 is urged toward the third chamber H3 side.

  A second valve body B2 is provided at the distal end of the primary pressure introduction path 7, and the second valve body B2 is configured to be opened and closed by a second diaphragm D2. That is, when the second diaphragm D2 is displaced toward the third chamber H3, the second valve body B2 is opened, and the fluid on the primary side of the fluid flow path 1 passes through the primary pressure introduction path 7 to the fourth chamber H4. be introduced. On the other hand, the displacement of the second diaphragm D2 toward the fourth chamber H4 moves the second valve body B2 toward the valve closing side, thereby reducing the amount of primary fluid introduced into the fourth chamber H4.

The operation when the secondary pressure is adjusted to the set pressure will be described.
When the secondary pressure of the fluid flow path 1 falls below the set pressure, the third chamber H3 of the pilot valve 4 that is connected to the secondary side of the fluid flow path 1 through the first secondary pressure introduction path 5 And the second diaphragm D2 is displaced toward the third chamber H3 by the biasing force of the second biasing spring G2. As a result, the second valve body B2 of the pilot valve 4 is operated to the open side, and the primary side pressure of the fluid flow path 1 is introduced into the fourth chamber H4 through the primary side pressure introduction path 7, and the pressure in the fourth chamber H4 Rises. Then, the increased pressure in the fourth chamber H4 is supplied as the driving pressure to the second chamber H2 of the pressure control valve 2 through the driving pressure introduction path 8, and the pressure in the second chamber H2 also increases, and the first chamber H1. The first diaphragm D1 is displaced toward the first chamber H1 due to the pressure difference between the first chamber H2 and the second chamber H2. Therefore, the first valve body B1 of the pressure control valve 2 is operated to the open side, and the secondary side pressure of the fluid flow path 1 is increased to adjust the secondary side pressure to the set pressure.

  On the other hand, when the secondary side pressure rises higher than the set pressure, the pressure in the third chamber H3 of the pilot valve 4 rises, and the second diaphragm D2 resists the biasing force of the second biasing spring G2, and the second diaphragm D2 moves into the fourth chamber H4. Displace to the side. As a result, the second valve body B2 of the pilot valve 4 is operated to the closed side, and there is no fluid supply source to the fourth chamber H4. Then, the fluid in the second chamber H2 is discharged to the secondary side via the orifice U, the second secondary pressure introduction path 6, the third chamber H3, and the first secondary pressure introduction path 5, and the second chamber H2 is discharged to the secondary side. The pressure in the two chambers H2 decreases, and the first diaphragm D1 is displaced toward the second chamber H2 due to the pressure difference between the first chamber H1 and the second chamber H2. Accordingly, the first valve body B1 of the pressure control valve 2 is operated to the closed side, and the secondary side pressure of the fluid flow path 1 is reduced to adjust the secondary side pressure to the set pressure.

  The set pressure of the pressure control valve 2 is not always a constant pressure, but the set pressure is adjusted to the target set pressure that is changed according to the load or the like by providing the pressure setting unit 3. For example, in the fluid flow path 1, the load becomes large during a time period in which much demand is expected, so the pressure setting unit 3 adjusts the set pressure to a high target set pressure, and the load is set in other time periods. Therefore, the set pressure is adjusted to the low target set pressure.

  As described above, in the pilot valve 4, the driving pressure corresponding to the magnitude relationship between the urging force of the second urging spring G <b> 2 and the secondary side pressure supplied through the first secondary side pressure introduction path 5 is the pilot valve 4. To the pressure control valve 2, and the secondary pressure is adjusted to the set pressure by the pressure control valve 2. Therefore, the pressure setting unit 3 changes and sets the set pressure of the pressure control valve 2, but the second biasing spring G2 is configured as a pressure setting spring 9 that sets the set pressure of the pressure control valve 2. By adjusting the spring load of the pressure setting spring 9 (second biasing spring G2), the set pressure of the pressure control valve 2 can be changed and set.

  As shown in FIGS. 2 and 3, the pressure setting unit 3 rotates the pressure adjusting screw 10 that can adjust the spring load applied to the pressure setting spring 9 in addition to the pressure setting spring 9 described above. And a control unit (not shown) for changing and setting the set pressure by controlling the operation of the drive unit 11. The pressure setting unit 3 is provided with a pressure setting spring 9 and a pressure adjusting screw 10 inside a pilot valve forming unit 14 that forms the pilot valve 4, and a drive unit 11 and a control unit ( The pilot valve forming portion 14 and the storage case 15 are connected to each other so that the spring load of the pressure setting spring 9 can be adjusted.

  As shown in FIG. 3, the pressure setting spring 9 of the pressure setting unit 3 is disposed in the fifth chamber H5 of the pilot valve 4, its upper end is in contact with the third diaphragm D3, and its lower end is It is in contact with the spring receiver 13. And in the lower part which forms the 5th chamber H5 among pilot valve formation parts 14, the 1st screw part N1 is formed in the inner wall part, and spring receiving part 13 was formed in the outer peripheral part. The second screw portion N2 and the first screw portion N1 formed on the pilot valve forming portion 14 are provided in a screwed state. In the fifth chamber H5 of the pilot valve 4, a first rotating shaft J1 is disposed in a state of penetrating the spring receiving portion 13 in the vertical direction. 1 rotation axis J1 and the spring receiving part 13 rotate integrally, and the spring receiving part 13 is comprised so that it may move up and down. The spring receiving portion 13 is moved up and down by integral rotation of the first rotating shaft J1 and the spring receiving portion 13, and the spring load applied to the pressure setting spring 9 is adjustable. Thereby, the first rotating shaft J1 and the spring receiving portion 13 are configured as the pressure adjusting screw 10. Further, the first rotating shaft J1 is disposed in a state where the lower end portion having a small diameter penetrates the pilot valve forming portion 14 and protrudes downward.

  On the other hand, as shown in FIG. 3, the drive unit 11 and the control unit of the pressure setting unit 3 are disposed inside the storage case 15 together with the second rotation shaft J <b> 2 that is rotationally driven by the drive unit 11. The second rotating shaft J2 is disposed in a state where the upper end side portion protrudes upward from the storage case 15. And the lower end side part of the 1st rotating shaft J1 and the upper end side part of the 2nd rotating shaft J2 are connected by the rotating shaft connection part 16, and the 1st rotating shaft J1 and the 2nd rotating shaft J2 are integrated. It is configured to be freely rotatable. As a result, the second rotating shaft J2 is rotationally driven by the drive unit 11, whereby the second rotating shaft J2 and the first rotating shaft J1 are integrally rotated to move the spring receiving portion 13 up and down, and the pressure setting spring. Adjust the spring load applied to 9.

  As for the connection between the pilot valve forming portion 14 and the storage case 15, as shown in FIGS. 2 and 3, in addition to the rotating shaft connecting portion 16 that connects the first rotating shaft J1 and the second rotating shaft J2, the pilot valve forming portion 14 and the storage case 15 are connected. A connecting member 22 that connects the plate-like first connecting portion K1 fixed to the valve forming portion 14 and the plate-like second connecting portion K2 fixed to the upper end side portion of the storage case 15 is provided. The connecting member 22 is formed in a columnar shape, and a plurality (four in this embodiment) are provided, and the first connecting portion K1 and the second connecting portion K2 are connected at a plurality of locations. In order to electrically insulate the pilot valve 4 and the storage case 15, for example, an insulating member is interposed between the second connecting portion K2 and the connecting member 22 is connected to the second connecting portion K2. The connecting member 22 itself is made of an insulating material.

As shown in FIG. 4, the drive unit 11 includes an electric drive motor 23 and a drive speed reduction mechanism S <b> 1 that rotates the second rotary shaft J <b> 2 by the rotational driving force of the drive motor 23. The drive reduction mechanism S1 includes a drive gear 24 fixed to the output shaft of the drive motor 23, and a first gear F1 externally fixed to the second rotating shaft J2. The first gear F1 is a drive gear. The drive gear 24 and the first gear F1 are engaged with each other. As a result, the rotation of the drive motor 23 is decelerated by the drive speed reduction mechanism S1 and then transmitted to the second rotation axis J2. The drive motor 23 rotates the second rotation axis J2.
As described above, when the second rotating shaft J2 is rotationally driven by the drive motor 23, the second rotating shaft J2 and the first rotating shaft J1 are integrally rotated to move the spring receiving portion 13 up and down as described above. The set pressure of the pressure control valve 2 can be changed and set by adjusting the spring load applied to the pressure setting spring 9 (see FIG. 3).

  The control unit of the pressure setting unit 3 monitors the rotation position of the second rotation axis J2 (corresponding to the rotation output shaft), and the rotation position of the second rotation axis J2 corresponds to the target set pressure. By controlling the operation of the drive motor 23 so as to be in the rotational position, the set pressure of the pressure control valve 2 is changed and set to the target set pressure. Therefore, as shown in FIGS. 4 and 5, the pressure setting unit 3 is provided with a rotation position detection sensor 25 that detects the rotation position of the second rotation axis J <b> 2, and the control unit detects the rotation position detection sensor 25. Based on the 25 detection information, the rotation position of the second rotation axis J2 is monitored.

(Rotation position detection sensor)
In the pressure control device according to the present invention, as shown in FIG. 5, as the rotational position detection sensor 25, a rotational angle detection sensor 26 (second rotational position) for detecting the rotational angle of the second rotational axis J <b> 2 within 360 degrees. Two rotation position detection sensors, which correspond to a detection sensor) and a rotation speed detection sensor 27 (corresponding to a first rotation position detection sensor) for detecting the rotation speed of the second rotation shaft J2. .

  The rotation angle detection sensor 26 is disposed at the lower end portion of the second rotation axis J2 (corresponding to the rotation output axis), and is directly connected to the second rotation axis J2 that is a rotation angle detection target within 360 degrees. It is attached. Therefore, the rotation angle detection sensor 26 is configured to be able to detect the rotation position of the second rotation axis J2 within 360 degrees as the rotation angle of the second rotation axis J2 within 360 degrees.

  The rotation speed detection sensor 27 rotates the third rotation axis J3 (corresponding to the deceleration rotation axis) transmitted by the rotation of the second rotation axis J2 (corresponding to the rotation output axis) being decelerated by the reference deceleration mechanism S2. It is configured to detect the position. The third rotation axis J3 is arranged in a state extending in a direction orthogonal to the second rotation axis J2. The reference speed reduction mechanism S2 is in a state in which the second gear F2 formed on the outer peripheral portion of the second rotating shaft J2 and the third gear F3 fixed to the third rotating shaft J3 mesh with each other below the first gear F1. It is comprised with the worm reduction mechanism provided in. Here, the second rotation axis J2 has a rotation range from the lower limit rotation position corresponding to the minimum value of the target set pressure to the upper limit rotation position corresponding to the maximum value of the target set pressure, and the deceleration rate of the reference deceleration mechanism S2 Is set such that the rotation range of the third rotation axis J3 is within 360 degrees with respect to the rotation range of the second rotation axis J2.

  The control unit of the pressure setting unit 3 obtains the rotation position of the second rotation axis J2 within 360 degrees detected by the rotation angle detection sensor 26 as the rotation angle P1 of the second rotation axis J2 within 360 degrees. Further, the control unit of the pressure setting unit 3 obtains the rotation speed P2 of the second rotation shaft J2 from the rotation position of the third rotation shaft J3 detected by the rotation speed detection sensor 27 and the deceleration rate of the reference deceleration mechanism S2. Yes. Then, the control unit of the pressure setting unit 3 performs the second rotation using the following [Equation 1] from the obtained rotation angle P1 of the second rotation axis J2 and the obtained rotation speed P2 of the second rotation axis J2. The rotational position P3 of the axis J2 is obtained. Thereby, a control part is equivalent to a rotation position calculating means.

[Equation 1]
P3 = P1 + 360 × P2
Here, P1 is the rotation angle of the second rotation axis J2, P2 is the rotation speed of the second rotation axis J2, and P3 is the rotation position of the second rotation axis J2.

  The control unit of the pressure setting unit 3 determines the magnitude relationship between the rotation position of the second rotation axis J2 and the set pressure of the pressure control valve 2 (for example, the pressure position of the pressure control valve 2 increases as the rotation position of the second rotation axis J2 increases). The relationship between the set pressure and the like is stored in advance, and the rotation of the second rotary shaft J2 is performed using the stored magnitude relationship so that the set pressure of the pressure control valve 2 becomes the target set pressure. The operation of the drive motor 23 is controlled to adjust the position. That is, the control unit 12 obtains the target rotational position of the second rotational axis J2 corresponding to the target set pressure from the stored magnitude relationship, and the rotational position of the second rotational axis J2 obtained in the above [Equation 1] is obtained. The operation of the drive motor 23 is controlled so as to reach the target rotation position.

In this way, by controlling the operation of the drive motor 23 by the control unit, the second rotary shaft J2 is automatically rotated to change the set pressure of the pressure control valve 2 to the target set pressure. For example, the second rotating shaft J2 may be excessively rotated due to a runaway control unit or a failure of the drive motor 23.
Therefore, in the pressure control device according to the present invention, in order to prevent excessive rotation of the second rotating shaft J2, as shown in FIGS. 5 to 7, the second rotating shaft J2 (corresponding to the rotating output shaft) is used. The reference reduction mechanism S2 that reduces the rotation and transmits it to the third rotation axis J3 (corresponding to the reduction rotation axis) and the third gear F3 (corresponding to the reduction gear) of the reference reduction mechanism S2 are in the excessive rotation position. A switch unit 29 that is switched to an operation state when the switch unit 29 is rotated, and a drive motor stop unit that stops driving the drive motor 23 as the switch unit 29 is switched to the operation state. The excessive rotation position is set to a position where the switch unit 29 is switched to the operating state as the second rotation axis J2 (corresponding to the rotation output axis) rotates beyond the proper rotation range.

  Here, FIG. 5 is a perspective view showing the reference speed reduction mechanism S2, the third rotation shaft J3, the switch unit 29, and the like, and FIG. 6 is a diagram when the rotation position of the second rotation shaft J2 is within the proper rotation range. FIG. 7 is a side view showing the positional relationship between the rotation position of the third rotation axis J3 and the switch unit 29. FIG. 7 shows that the rotation position of the second rotation axis J2 exceeds the proper rotation range and is rotated to the increase side and the decrease side. It is a side view which shows the positional relationship of the rotation position of the 3rd rotating shaft J3 and the switch part 29 at the time.

Although not shown, the switch unit 29 is attached to a power supply line that supplies driving power to the drive motor 23. As a result, when the third gear F3 of the reference speed reduction mechanism S2 is rotated to the excessive rotation position, the switch unit 29 is switched to the OFF state as the operation state, and to the drive motor 23 as it is switched to the OFF state. It is comprised by the electric power interruption type switch part which can interrupt | block supply of the electric power for driving of this. In this way, the drive motor stopping means is configured by the switch unit 29 which is a power cutoff type switch unit, and this power cutoff type switch unit is normally in an ON state and is supplied with power for driving to the drive motor 23. When the third gear F3 is rotated to the excessive rotation position, the ON state is switched to the OFF state, and the drive power supply to the drive motor 23 is cut off. Therefore, when the third gear F3 is rotated to the excessive rotation position, it is mechanically disconnected directly by the power cut-off switch unit 29 attached to the power supply line that supplies driving power to the drive motor 23, so that the drive motor The supply of driving power to 23 can be reliably shut off.
Further, in addition to the switch unit 29, a switching operation unit 28 that can be switched to the operating state as the third gear F3 is rotated to the excessive rotation position is provided. Is attached to the third gear F3. That is, as shown in FIG. 7, as the third gear F <b> 3 is rotated to the excessive rotation position, the switching operation unit 29 attached to the third gear F <b> 3 presses the switch unit 29, It is configured to be switchable to an operating state.

  As for the excessive rotation position, as described above, the switch unit 29 is switched to the operation state (OFF state) as the second rotation shaft J2 (corresponding to the rotation output shaft) is rotated beyond the proper rotation range. Set to position. That is, as described above, the second rotation axis J2 has a rotation range from the lower limit rotation position corresponding to the minimum value of the target set pressure to the upper limit rotation position corresponding to the maximum value of the target set pressure. When the rotation position of the second rotation shaft J2 (corresponding to the rotation output shaft) exceeds the proper rotation range, the switch unit 29 is switched to the operating state. Therefore, as shown in FIG. 7, when the rotation position of the second rotation shaft J2 is rotated to the decrease side with respect to the lower limit rotation position, the switching operation unit 29 attached to the third gear F3 presses the switch unit 29. Then, when the switch unit 29 is switched from the ON state to the OFF state and the rotation position of the second rotation shaft J2 is rotated more than the upper limit rotation position, the switching operation unit attached to the third gear F3. 29 presses the switch part 29, and the switch part 29 is switched from the ON state to the OFF state.

  As described above, when the rotation position of the second rotation shaft J2 exceeds the appropriate rotation range, the switching operation unit 29 attached to the third gear F3 immediately presses the switch unit 29, and the switch unit 29 is in the ON state. Is switched to the OFF state, the supply of driving power to the driving motor 23 is cut off, and the driving motor 23 is forcibly stopped. Therefore, for example, even if the control unit runs away and the drive motor 23 malfunctions, the drive motor has an optimal timing immediately before the rotational position of the second rotary shaft J2 is rotated excessively beyond the proper rotational range. It is possible to prevent the second rotating shaft J2 from excessively rotating by stopping the driving of the second rotating shaft J2.

(Clutch mechanism)
As described above, the controller can automatically change and set the set pressure of the pressure control valve 2 to the target set pressure by controlling the operation of the drive motor 23. For example, the pressure control can be performed manually by the operator. The set pressure of the valve 2 can be changed and set.
That is, although not shown, the pressure setting unit 3 is engaged with the first gear F1 on the pressure adjusting screw 10 side and the driving gear 24 on the driving unit 11 side to transmit the rotational driving force of the driving unit 11 to the pressure adjusting screw 10. And a clutch mechanism that can be switched between a transmission state in which the first gear F1 and the drive gear 24 are disengaged and a transmission state in which the rotational driving force of the drive unit 11 is blocked from being transmitted to the pressure adjusting screw 10. .

  Thus, by providing the clutch mechanism, when the control unit automatically changes the set pressure of the pressure control valve 2 to the target set pressure, the clutch mechanism is switched to the transmission state and manually operated. When performing, the clutch mechanism is switched to the disengaged state.

  In order to change and set the set pressure of the pressure control valve 2 by manual operation by an operator, as shown in FIG. 3, the rotary shaft connecting portion 16 is provided with a manual operation member 20, which is manually operated by the operator. Thus, when the manual operation member 20 is rotated, the first rotation axis J1 and the second rotation axis J2 are rotated in accordance with the rotation operation. Thereby, after switching the clutch mechanism to the disengaged state, the operator rotates the manual operation member 20 to rotate the first rotating shaft J1 and the second rotating shaft J2 to move the spring receiving portion 13 up and down. Then, the set pressure of the pressure control valve 2 is changed and set by adjusting the spring load applied to the pressure setting spring 9. In this way, the pressure setting unit 3 is configured to be able to change and set the set pressure of the pressure control valve 2 by an operator's manual operation.

  Here, in the pressure control device according to the present invention, as described above, the control unit of the pressure setting unit 3 obtains the rotation angle of the second rotation axis J2 from the detection information of the rotation angle detection sensor 26, and the rotation speed detection sensor 27. The rotation speed of the second rotation axis J2 is obtained from the detected information, and the rotation angle of the second rotation axis J2 is calculated from the obtained rotation angle and rotation speed of the second rotation axis J2 using the above [Equation 1]. Although the position P3 is obtained, the rotational position of the second rotary shaft J2 can be obtained even when the set pressure of the pressure control valve 2 is changed and set manually by the operator.

  That is, when the set pressure of the pressure control valve 2 is changed and set by the manual operation of the operator, the pressure control valve is operated by rotating the manual operation member 20 by the operator after switching the clutch mechanism to the disconnected state. Change the setting pressure of 2. At this time, since the second rotation axis J2 is rotated by the rotation operation of the manual operation member 20, the third rotation axis J3 is also rotated by the reference speed reduction mechanism S2 along with the rotation of the second rotation axis J2. Thereby, the control unit of the pressure setting unit 3 can obtain the rotation angle of the second rotation axis J2 within 360 degrees from the detection information of the rotation angle detection sensor 26, and the first detection information of the rotation number detection sensor 27. The number of rotations of the two rotation axis J2 can be obtained. Therefore, the control unit of the pressure control unit 3 obtains the rotational position P3 of the second rotational axis J2 from the obtained rotational angle and rotational speed of the second rotational axis J2 using the above [Equation 1]. Can do. Therefore, for example, the control unit of the pressure control unit 3 displays the obtained rotation position of the second rotation axis J2 on the display unit or the like, so that the operator can recognize the rotation position of the second rotation axis J2 while The set pressure of the control valve 2 can be changed and set, and the operator can easily change and set the set pressure of the pressure control valve 2 to a desired set pressure.

  Even by such manual operation, there is a possibility that the second rotation axis J2 is excessively rotated. Therefore, the pressure control device is provided with a configuration for preventing excessive rotation of the second rotating shaft J2 even when the second rotating shaft J2 is rotated manually.

  That is, as shown in FIG. 7, the switching operation portion 28 provided in the third gear F <b> 3 extends along the rotation direction of the third gear F <b> 3, has a groove portion with one end closed and the other end open. Two 39 are formed. And the rod-shaped contact body 40 fixed to the storage case 15 side is arrange | positioned so that insertion / removal with respect to the groove part 39 is possible by rotation of the 3rd gear F3. That is, when the second rotation shaft J2 is rotated, the contact body 40 is inserted into the groove portion 39 from the open end side of the groove portion 39, and when the second rotation shaft J2 is rotated in the reverse direction, the contact body. 40 is detached from the open end side of the groove 39 to the outside of the groove 39. As a result, when the second rotation shaft J2 is excessively rotated to the excessive rotation range, the contact body 40 comes into contact with the closed end side wall portion of the groove portion 39, and by this contact, the further third gear F3 is brought into contact. Rotation is regulated. Thus, excessive rotation of the second rotating shaft J2 is prevented by restricting the rotation of the third gear F3 by the contact between the contact body 40 and the closed end side wall of the groove 39.

  Here, as shown in FIG. 7, the excessive rotation position at which the switching operation unit 28 presses the switch unit 29 to switch the switch unit 29 to the operating state is the contact body 40 in the rotation direction of the third gear F <b> 3. It is in front of the position where it abuts against the closed end side wall of the groove 39. Therefore, when the control unit controls the operation of the drive motor 23 to automatically rotate the second rotating shaft J2, the switching operation is performed before the contact body 40 contacts the closed end side wall of the groove 39. The unit 28 presses the switch unit 29 to switch the switch unit 29 to the operating state, and the drive motor 23 is stopped. As a result, when the control unit controls the operation of the drive motor 23 to automatically rotate the second rotary shaft J2, the drive motor 23 is stopped driving as the switch unit 29 is switched to the operating state. The excessive rotation of the second rotation axis J2 can be appropriately prevented.

[ Reference form]
This reference embodiment, in the first embodiment, which is another form state of the configuration for switching the switch section 29 in the operation state. Hereinafter, the configuration for switching the switch unit 29 in the reference mode to the operation state will be described, but the other configurations are the same as those in the first embodiment, and thus the description thereof will be omitted.

In the first embodiment, the switching operation unit 29 is attached to the third gear F3 (corresponding to the deceleration gear) of the reference deceleration mechanism S2, and when the third gear F3 is rotated to the excessive rotation position, the switching operation unit 29 is provided. However, the switch unit 29 is pressed to switch the switch unit 29 to the operating state.
In this reference form, although not shown, the rotation of the second rotation shaft J2 (corresponding to the rotation output shaft) is decelerated by the reference deceleration mechanism S2 and transmitted, and the third rotation shaft J3 (corresponding to the deceleration rotation shaft) is transmitted. When the third rotary shaft J3 is rotated to the excessive rotation position, the switching operation unit presses the switch unit 29 to switch the switch unit 29 to the operating state. Thereby, it is detected that the rotational position of the third rotating shaft J3, not the rotational position of the third gear F3, has reached the excessive rotational position, and the switch unit 29 is switched to the operating state in accordance with the detection. The drive motor 23 can be stopped by interrupting the supply of drive power to the drive motor 23.

[Another embodiment]
(1) In the first and second embodiments, the reference speed reduction mechanism S2 is configured by a worm speed reduction mechanism, but the speed reduction mechanism configured by the reference speed reduction mechanism S2 is appropriately changed. Is possible.

(2) In the first and second embodiments, when the drive motor 23 is stopped, the switch unit 29 is configured by a power cut-off switch unit, and the supply of drive power to the drive motor 23 is cut off. The drive motor 23 is stopped by the drive stop. For example, when the switch unit 29 is switched to the operation state (for example, ON state or OFF state), the drive stop is given to the drive motor 23 to stop driving. Command means can be provided, and the drive motor 23 can be stopped by a drive stop command from the drive stop command means. In other words, the drive motor stop means for stopping the drive motor 23 is not limited to the one that cuts off the supply of drive power, and the switch unit is in an operating state (for example, one that includes a drive command means that gives a drive stop command). Any change can be made as long as the operation of stopping driving the drive motor is performed in accordance with the switching to the ON state or the OFF state.

  The present invention is provided with a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure, and a pressure setting unit that changes and sets the set pressure of the pressure control valve, and the pressure setting unit includes a spring A pressure setting spring capable of changing and setting the set pressure by adjusting a load, a rotation output shaft capable of rotating a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring, and a drive for rotating the rotation output shaft The motor includes a motor and a controller that controls the operation of the drive motor. The structure is simplified and downsized, and an excessive load on the rotary output shaft is prevented while preventing unnecessary load on the drive motor. It can be applied to various pressure control devices that can prevent the above.

DESCRIPTION OF SYMBOLS 1 Fluid flow path 2 Pressure control valve 3 Pressure setting part 9 Pressure setting spring 10 Pressure adjusting screw 23 Drive motor 26 2nd rotation position detection sensor (rotation angle detection sensor)
27 First rotational position detection sensor (rotational speed detection sensor)
28 Switching operation part 29 Power interruption type switch part (switch part, drive motor stop means)
F3 Reduction gear (third gear)
J2 Rotation output shaft (second rotation shaft)
J3 Deceleration axis (third axis)
S2 Reference deceleration mechanism

Claims (5)

A pressure control valve for adjusting the secondary pressure of the fluid flow path to a set pressure and a pressure setting unit for changing and setting the set pressure of the pressure control valve are provided, and the pressure setting unit is configured by adjusting a spring load. A pressure setting spring capable of changing and setting the set pressure; a rotation output shaft capable of rotating a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring; a drive motor for rotating the rotation output shaft; A pressure control device comprising a control unit for controlling the drive amount of the drive motor,
A reference speed reduction mechanism that decelerates the rotation of the rotation output shaft and transmits it to the speed reduction rotation shaft, and a speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is switched to an operating state when rotated to an excessive rotation position. A switch unit, and a drive motor stop unit that stops driving the drive motor as the switch unit is switched to an operating state, and the excessive rotation position causes the rotation output shaft to rotate beyond an appropriate rotation range. As it is done, it is set to a position to switch the switch part to the operating state ,
The speed reduction gear is provided with a switching operation section that can switch the switch section to an operating state as the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position. The reduction gear of the reference reduction mechanism or the reduction rotation shaft rotates beyond the excessive rotation position by the contact between the switching operation portion and the contact body fixed to the storage case side of the pressure control device. A pressure control device configured to regulate the operation . The switch unit is switched to an OFF state as an operation state when the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position, and the drive is switched as the state is switched to the OFF state. configured to supply driving power to the motor in the disengaged freely power cut-off switch section, the driving motor stopping unit is constituted by the power shut-off switch section,
The switching operation portion is formed with two grooves extending along the rotation direction of the reduction gear, closed at one end and opened at the other end,
The rod-shaped contact body fixed to the storage case side of the pressure control device is detachably disposed with respect to the groove portion by rotation of the speed reduction gear,
The switching operation unit is
As the reduction gear of the reference reduction mechanism or the reduction rotation shaft is rotated to the excessive rotation position.
The power cut-off switch unit is pressed by the radially outer side surface of the reduction gear of the switching operation unit to switch to the operating state, and the contact body and the closed end side wall of the groove unit are in contact with each other. The pressure control device according to claim 1, wherein the rotation of the reduction gear is restricted . A pressure control valve for adjusting the secondary pressure of the fluid flow path to a set pressure and a pressure setting unit for changing and setting the set pressure of the pressure control valve are provided, and the pressure setting unit is configured by adjusting a spring load. A pressure setting spring capable of changing and setting the set pressure; a rotation output shaft capable of rotating a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring; a drive motor for rotating the rotation output shaft; A pressure control device comprising a control unit for controlling the drive amount of the drive motor,
A reference speed reduction mechanism that decelerates the rotation of the rotation output shaft and transmits it to the speed reduction rotation shaft, and a speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is switched to an operating state when rotated to an excessive rotation position. A switch unit, and a drive motor stop unit that stops driving the drive motor as the switch unit is switched to an operating state, and the excessive rotation position causes the rotation output shaft to rotate beyond an appropriate rotation range. As it is done, it is set to a position to switch the switch part to the operating state,
The switch unit is switched to an OFF state as an operation state when the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position, and the drive is switched as the state is switched to the OFF state. The power cut-off switch unit is configured to be able to cut off the supply of drive power to the motor, and the drive motor stop means is formed of the power cut-off switch unit.
The speed reduction gear is provided with a switching operation section that can switch the switch section to an operating state as the speed reduction gear of the reference speed reduction mechanism or the speed reduction rotation shaft is rotated to the excessive rotation position.
When the switching operation portion comes into contact with a contact body fixed to the storage case side of the pressure control device, the reduction gear of the reference reduction mechanism or the reduction rotation shaft rotates beyond the excessive rotation position. A pressure control device configured to regulate the operation .   Based on the detection information of the first rotation position detection sensor that detects the rotation position of the deceleration rotation shaft, the second rotation position detection sensor that detects the rotation position of the rotation output shaft, and the detection information of the first rotation position detection sensor. A rotation speed of the rotation output shaft is obtained, and a rotation angle of the rotation output shaft is obtained based on detection information of the second rotation position detection sensor, and the rotation is calculated from the obtained rotation speed and rotation angle of the rotation output shaft. The pressure control apparatus according to any one of claims 1 to 3, further comprising a rotational position calculation unit that obtains a rotational position of the output shaft.   The pressure control device according to claim 1, wherein the reference speed reduction mechanism is configured by a worm speed reduction mechanism.

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