JP6040968B2 - hydraulic unit - Google Patents

Description

The present invention relates to a hydraulic unit that supplies oil to a machine tool such as a machining center.

Some conventional hydraulic units have an oil tank and supply oil in the oil tank to a machine tool or the like. In this hydraulic unit, a filter is placed in the oil tank,
Oil in the oil tank is sucked up by the pump. Accordingly, the foreign matter is removed from the oil in the oil tank by passing through the filter before being supplied to the pump.

JP2013-76333A

In a conventional hydraulic unit, when a large amount of foreign matter adheres to the filter in the oil tank, it is necessary to clean the filter. However, it is necessary to remove the ASSY other than the oil tank, or to remove the pump motor and pump unit. There is a problem that a device such as a crane for lifting a heavy object is required, and the filter cannot be easily cleaned.

Therefore, an object of the present invention is to provide a hydraulic unit capable of easily cleaning a filter.

A hydraulic unit according to a first aspect of the present invention includes a pump that sucks oil supplied from an oil tank through a suction port and discharges it from the discharge port, and a motor that can be switched between forward rotation and reverse rotation and that drives the pump And a control means for controlling the motor, and a filter through which oil before being supplied to the pump passes in a predetermined direction when the motor is controlled to rotate forward in the oil tank. When the motor is controlled to rotate in reverse, the pump discharges the oil sucked from the discharge port from the suction port, and the discharged oil is supplied to the oil tank. cleaning of the filter by passing through the filter in a direction opposite to the predetermined direction is performed Te, the control means stores a rotation speed of the change pattern of the motor at the time of cleaning of the filter Characterized in that it has a that storage unit.

In this hydraulic unit, the motor is rotated in the reverse direction, the oil sucked in from the discharge port of the pump is discharged from the suction port, the discharged oil is supplied to the oil tank, and the filter is passed in the direction opposite to the predetermined direction. Thus, the filter can be cleaned. Therefore, the filter can be easily cleaned.

In this hydraulic unit, the filter can be cleaned efficiently by changing the rotational speed of the motor during cleaning of the filter according to the change pattern.

The hydraulic unit according to a second aspect of the invention is the hydraulic unit according to the first aspect of the invention, wherein the control means controls the motor so that the pressure on the suction port side of the pump during cleaning of the filter is not more than a predetermined pressure. It is characterized by controlling.

In this hydraulic unit, the pressure on the suction port side of the pump at the time of cleaning the filter is set to a predetermined pressure or less, so that the oil seal attached to the shaft penetrating portion of the pump can be prevented from being damaged or leaking.

A hydraulic unit according to a third aspect of the present invention is the hydraulic unit according to the second aspect of the present invention, further comprising a pressure sensor for detecting the pressure on the suction port side of the pump, and the control means is detected by the pressure sensor. The motor is controlled based on the applied pressure.

In this hydraulic unit, by controlling the motor based on the pressure detected by the pressure sensor, it is possible to prevent the oil seal attached to the shaft penetrating portion of the pump from being damaged or leaking.

A hydraulic unit according to a fourth aspect of the present invention is the hydraulic unit according to the second aspect of the present invention, further comprising pressure estimating means for estimating the pressure on the suction port side of the pump from the torque of the motor. The motor is controlled based on the pressure estimated by the pressure estimating means.

In this hydraulic unit, an oil seal attached to the shaft penetrating part of the pump is used without controlling the motor based on the pressure estimated from the torque of the motor, thereby detecting the pressure on the suction port side of the pump. Can be prevented from being damaged or leaking oil.

The hydraulic unit according to a fifth aspect of the present invention is the hydraulic unit according to any one of the first to fourth aspects, further comprising an informing means for informing an alarm, wherein the control means has a lower rotational speed of the motor. The notification means is controlled so that an alarm is notified when the rotation speed becomes lower than the rotation speed.

In this hydraulic unit, for example, when a large amount of foreign matter adheres to the filter and cannot be removed, the user can be notified by issuing an alarm indicating that the filter cannot be cleaned if the rotational speed of the motor falls below the lower limit rotational speed. it can.

A hydraulic unit according to a sixth aspect of the present invention is the hydraulic unit according to any one of the first to fifth aspects, further comprising stirring means for stirring the liquid in the oil tank.

In this hydraulic unit, foreign substances precipitated in the oil tank can be agitated by the agitating unit before and during cleaning of the filter, and oil containing the foreign substances can be effectively extracted from the waste oil outlet of the oil tank.
A hydraulic unit according to a seventh aspect of the present invention includes a pump that sucks oil supplied from an oil tank through a suction port and discharges it from the discharge port, and a motor that can be switched between forward rotation and reverse rotation and that drives the pump And a control means for controlling the motor, and a filter through which oil before being supplied to the pump passes in a predetermined direction when the motor is controlled to rotate forward in the oil tank. When the motor is controlled to rotate in reverse, the pump discharges the oil sucked from the discharge port from the suction port, and the discharged oil is supplied to the oil tank. The filter is cleaned by passing through the filter in a direction opposite to the predetermined direction, and the control means sets the pressure on the suction port side of the pump during the cleaning of the filter to a predetermined pressure. And controlling said motor so as to lower.
In this hydraulic unit, the oil is sucked from the pump outlet by rotating the motor in the reverse direction.
Discharge from the mouth, supply the discharged oil to the oil tank, and set the filter in the direction opposite to the specified direction.
The filter can be cleaned by passing it through. Therefore, filter cleaning
Can be easily performed.
In this hydraulic unit, the pressure on the suction port side of the pump when cleaning the filter is kept below a specified pressure.
Doing so may damage the oil seal attached to the shaft through section of the pump or cause oil leakage.
Can be prevented.
A hydraulic unit according to an eighth invention is the hydraulic unit according to the seventh invention, wherein
A pressure sensor for detecting the pressure on the suction port side of the pump;
The motor is controlled based on the pressure detected by the pressure sensor.
In this hydraulic unit, the motor is controlled based on the pressure detected by the pressure sensor.
Therefore, the oil seal attached to the shaft penetration of the pump is prevented from being damaged or leaking.
You can stop.
A hydraulic unit according to a ninth aspect is the hydraulic unit according to the seventh aspect, wherein
Pressure estimation means for estimating the pressure on the suction port side of the pump from the torque of the motor;
The control means controls the motor based on the pressure estimated by the pressure estimation means.
It is characterized by that.
In this hydraulic unit, the motor is controlled based on the pressure estimated from the motor torque.
Without using a pressure sensor that detects the pressure on the inlet side of the pump.
It is possible to prevent the oil seal attached to the shaft penetrating portion from being damaged or leaking.
A hydraulic unit according to a tenth aspect of the present invention is the hydraulic unit according to any one of the seventh to ninth aspects, further comprising an informing means for informing an alarm, wherein the control means has a lower rotational speed of the motor. The notification means is controlled so that an alarm is notified when the rotation speed becomes lower than the rotation speed.
In this hydraulic unit, for example, if a large amount of foreign matter adheres to the filter and cannot be removed, the motor
When the number of rotations is below the lower limit number of revolutions, an alarm indicating that the filter cannot be cleaned is reported.
The user can be notified by knowing.
A hydraulic unit according to an eleventh aspect of the invention is the hydraulic unit according to any of the seventh to tenth aspects, further comprising stirring means for stirring the liquid in the oil tank.
In this hydraulic unit, the oil tank is used by the stirrer before or during cleaning of the filter.
The foreign matter that has settled inside is agitated, and the oil containing the foreign matter is effectively extracted from the oil outlet of the oil tank.
You can.
A hydraulic unit according to a twelfth aspect of the present invention is a pump that sucks oil supplied from an oil tank from a suction port and discharges it from the discharge port, and a motor that can be switched between forward rotation and reverse rotation and that drives the pump And a control means for controlling the motor and a notifying means for notifying an alarm, and when the motor is controlled to rotate normally in the oil tank, before being supplied to the pump When a filter through which oil passes in a predetermined direction is arranged and the motor is controlled to rotate in the reverse direction, the pump sucks out the oil sucked from the discharge port from the suction port, and is discharged When the oil is supplied to the oil tank and passes through the filter in the direction opposite to the predetermined direction, the filter is cleaned, and the control means is configured such that the rotational speed of the motor is a lower limit rotational speed. When it is below, and controls the notification means so alarm is reported.
In this hydraulic unit, the oil is sucked from the pump outlet by rotating the motor in the reverse direction.
Discharge from the mouth, supply the discharged oil to the oil tank, and set the filter in the direction opposite to the specified direction.
The filter can be cleaned by passing it through. Therefore, filter cleaning
Can be easily performed.
In this hydraulic unit, for example, if a large amount of foreign matter adheres to the filter and cannot be removed, the motor
When the number of rotations is below the lower limit number of revolutions, an alarm indicating that the filter cannot be cleaned is reported.
The user can be notified by knowing.
A hydraulic unit according to a thirteenth aspect of the invention is the hydraulic unit according to the twelfth aspect of the invention, characterized in that it has stirring means for stirring the liquid in the oil tank.
In this hydraulic unit, the oil tank is used by the stirrer before or during cleaning of the filter.
The foreign matter that has settled inside is agitated, and the oil containing the foreign matter is effectively extracted from the oil outlet of the oil tank.
You can.

  As described above, according to the present invention, the following effects can be obtained.

In the first aspect of the invention, the motor is rotated in the reverse direction, the oil sucked from the discharge port of the pump is discharged from the suction port, the discharged oil is supplied to the oil tank, and the filter is passed in the direction opposite to the predetermined direction. Thus, the filter can be cleaned. Therefore, the filter can be easily cleaned.

In the first invention, the filter can be cleaned efficiently by changing the rotational speed of the motor during cleaning of the filter according to the change pattern.

In the second invention, the pressure on the suction port side of the pump at the time of cleaning the filter is set to a predetermined pressure or less, thereby preventing the oil seal attached to the shaft through portion of the pump from being damaged or leaking.

In 3rd invention, it can prevent that the oil seal attached to the shaft penetration part of a pump breaks or leaks by controlling a motor based on the pressure detected with the pressure sensor.

In the fourth invention, the oil attached to the shaft penetrating portion of the pump without using the pressure sensor for detecting the pressure on the suction port side of the pump by controlling the motor based on the pressure estimated from the torque of the motor. The seal can be prevented from being broken or leaking.

In the fifth aspect of the invention, for example, when a large amount of foreign matter adheres to the filter and cannot be removed, if the motor speed falls below the lower limit speed, the user is notified by an alarm indicating that the filter cannot be cleaned. Can do.

In the sixth aspect of the present invention, the foreign matter precipitated in the oil tank can be agitated by the agitating unit before and during cleaning of the filter, and the oil containing the foreign matter can be effectively extracted from the waste oil outlet of the oil tank.
In the seventh invention, the motor is rotated in the reverse direction, the oil sucked from the discharge port of the pump is discharged from the suction port, the discharged oil is supplied to the oil tank, and the filter is passed in the direction opposite to the predetermined direction. Thus, the filter can be cleaned. Therefore, the filter can be easily cleaned.
In the seventh aspect of the invention, the pressure on the suction port side of the pump when cleaning the filter is reduced to a predetermined pressure or less.
Doing so may damage the oil seal attached to the shaft through section of the pump or cause oil leakage.
Can be prevented.
In the eighth invention, the motor is controlled based on the pressure detected by the pressure sensor.
Therefore, the oil seal attached to the shaft penetration of the pump is prevented from being damaged or leaking.
You can stop.
In the ninth invention, the motor is controlled based on the pressure estimated from the torque of the motor.
Without using a pressure sensor that detects the pressure on the inlet side of the pump.
It is possible to prevent the oil seal attached to the shaft penetrating portion from being damaged or leaking.
In the tenth invention, for example, when a large amount of foreign matter adheres to the filter and cannot be removed, the motor
When the number of rotations is below the lower limit number of revolutions, an alarm indicating that the filter cannot be cleaned is reported.
The user can be notified by knowing.
In the eleventh aspect of the invention, the oil tank is used by the agitation unit before or during cleaning of the filter.
The foreign matter that has settled inside is agitated, and the oil containing the foreign matter is effectively extracted from the oil outlet of the oil tank.
You can.
In the twelfth invention, the oil is sucked from the discharge port of the pump by rotating the motor in the reverse direction.
Discharge from the mouth, supply the discharged oil to the oil tank, and set the filter in the direction opposite to the specified direction.
The filter can be cleaned by passing it through. Therefore, filter cleaning
Can be easily performed.
In the twelfth invention, for example, when a large amount of foreign matter adheres to the filter and cannot be removed, the motor
When the number of rotations is below the lower limit number of revolutions, an alarm indicating that the filter cannot be cleaned is reported.
The user can be notified by knowing.
In the thirteenth aspect of the invention, the oil tank is used by the stirring unit before or during cleaning of the filter.
The foreign matter that has settled inside is agitated, and the oil containing the foreign matter is effectively extracted from the oil outlet of the oil tank.
You can.

1 is a front view of a hydraulic unit according to an embodiment of the present invention. It is a figure which shows the control block of the hydraulic unit of FIG. It is a figure which shows the operation | movement at the time of cleaning of a strainer. It is a figure which shows the state of the hydraulic unit at the time of cleaning of a strainer. It is a figure which shows the rotation speed and pressure change of the pump at the time of cleaning of a strainer.

  Hereinafter, embodiments of a hydraulic unit 1 according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the hydraulic unit 1 includes a device main body 2 and an oil tank 3 to which the device main body 2 is attached. The apparatus main body 2 includes a plate-like gantry 4 disposed above the oil tank 3, a motor 5 fixed to the upper surface of the gantry 4, and a pump 6 driven by the motor 5. The hydraulic unit 1 is provided in a machine tool such as a machining center, for example, and is connected to a hydraulic cylinder that operates a chuck mechanism that holds and fixes a workpiece or a tool.

The pump 6 has a discharge port 7 disposed at its upper end and a suction port 8 disposed at its lower end. A discharge hose (not shown) is connected to the discharge port 7, and oil discharged from the discharge port 7 is supplied to the hydraulic cylinder or the like through the discharge hose during normal operation of the hydraulic unit 1. A suction pipe 9 is connected to the suction port 8, and the other end of the suction pipe 9 is disposed inside the oil tank 3.

A strainer 10 as an example of a filter is attached to the other end of the suction pipe 9 arranged inside the oil tank 3. The strainer 10 has a cylindrical shape, and the other end of the suction pipe 9 is disposed on the inner peripheral side thereof. Accordingly, the oil in the oil tank 3 passes through the strainer 10 from the outer peripheral side toward the inner peripheral side and flows into the other end of the suction pipe 9. By passing through the strainer 10, foreign matters contained in the oil are removed. It is. Therefore, in the hydraulic unit 1, when the pump 6 is driven by the motor 5, the oil in the oil tank 3 is sucked up and supplied to the pump 6, but the oil in the oil tank 3 is supplied to the pump 6. The foreign matter is removed by the strainer 10 before the cleaning.

A waste oil port 11 is disposed at the lower end of the front surface of the oil tank 3. The waste oil port 11 is for extracting oil from the oil tank 3 and is closed except when oil is extracted.

The hydraulic unit 1 includes a stirring member 12 that stirs the oil in the oil tank 3. The agitating member 12 can move inside the oil tank 3, and a part of the agitating member 12 protrudes from the gantry 4 to the outside of the oil tank 3. Therefore, the user can stir the oil in the oil tank 3 by holding the portion protruding from the gantry 4 of the stirring member 12 and moving the stirring member 12 up and down. The stirring member 12 of the present embodiment has a spiral portion disposed at the lower end thereof, and the spiral portion is configured to be movable in the vertical direction on the outer peripheral side of the strainer 10.

As shown in FIG. 2, the controller 20 of the hydraulic unit 1 is connected to a controller 21, a motor 5, a discharge port pressure sensor 7a, a suction port pressure sensor 8a, and a rotational speed sensor 5a.

The controller 21 is an operation unit for operating the hydraulic unit 1 and includes a display unit 21a.
have. Therefore, when the user performs the cleaning of the strainer 10, the user switches to the maintenance mode by operating the controller 21 and presses the cleaning operation start key, so that the cleaning operation of the strainer 10 is started. Even if the cleaning operation of the strainer 10 is performed, the display unit 21a displays an alarm indicating that a large amount of foreign matter attached to the strainer 10 cannot be removed.

The discharge port pressure sensor 7 a is a sensor that detects the pressure on the discharge port side of the pump 6, and the suction port pressure sensor 8 a is a sensor that detects the pressure on the suction port side of the pump 6. The rotation speed sensor 5 a is a sensor that detects the actual rotation speed of the motor 5.

The control unit 20 includes a pattern storage unit 20a that stores a change pattern of the rotation speed and rotation speed of the motor 5 when the strainer 10 is cleaned. Therefore, the control part 20 controls the motor 5 based on the change pattern memorize | stored in the pattern memory | storage part 20a at the time of the cleaning operation of a filter.

In the cleaning operation of the strainer 10, the control unit 20 of the present embodiment controls the motor 5 so that the pressure on the suction port 8 side of the pump 6 (pressure detected by the suction port pressure sensor 8 a) is less than the allowable pressure c0. To control. Therefore, when the control unit 20 controls the motor 5 based on the change pattern stored in the pattern storage unit 20a during the cleaning operation of the strainer 10, the pressure on the suction port 8 side of the pump 6 sets the allowable pressure c0. When exceeding, the rotation speed of the motor 5 is limited regardless of the change pattern.

The control unit 20 according to the present embodiment displays the display unit 20 of the controller 20 so that an alarm is notified when the state in which the rotational speed of the motor 5 is equal to or lower than the lower limit rotational speed a0 is continued for a time T0.
a is controlled. For example, if a large amount of foreign matter adheres to the strainer 10 and cannot be removed, the pressure on the suction port 8 side of the pump 6 exceeds the allowable pressure c0, so the rotational speed of the motor 5 is the lower limit rotational speed a.
The strainer 10 may not be cleaned due to the amount of oil flowing from the pump 5 into the oil tank 3 being less than 0. Therefore, even if the cleaning operation of the strainer 10 is performed based on the change pattern stored in the pattern storage unit 20a, the strainer 10
An alarm indicating that cleaning cannot be performed is displayed on the display unit 20a to notify the user.

The operation of the hydraulic unit 1 when performing the cleaning operation of the strainer 10 will be described with reference to FIG.

The user moves the agitating member 12 up and down to agitate the oil in the oil tank 3 (step 1: S1), and withdraws the oil in which the precipitated foreign matter is agitated from the waste oil port 11 to the outside ( Step 2: S2). Thus, after extracting the oil in the oil tank 3, the discharge hose attached to the discharge port 7 of the pump 6 is removed, and the cleaning hose is connected to the discharge port 7 of the pump 6 as shown in FIG. (Step 3: S3). The other end of the cleaning hose is disposed in a container containing cleaning oil. At this time, during the cleaning operation of the strainer 10, the cleaning oil is extracted from the waste oil port 11 to the outside, so that the waste oil port 11 is opened, and the waste oil port 11 is extracted below the waste oil port 11. A receiving member (not shown) for receiving oil is disposed.

In this state, when the operation of starting the cleaning operation of the strainer 10 is performed with respect to the controller 21 in order to start the cleaning operation of the strainer 10, the motor 5 is controlled to rotate in the reverse direction, and cleaning oil has entered. The oil in the container is sucked from the discharge port 7 of the pump 6, and the sucked oil is discharged from the suction port 8 toward the oil tank 3 (step 4: S4). The oil supplied to the oil tank 3 passes through the strainer 10 from the inner peripheral side toward the outer peripheral side. At this time, the rotational speed of the motor 5 (for example, the rotational speed of the motor 5) is controlled based on the change pattern stored in the pattern storage unit 20a. Thus, when the motor 5 is controlled based on the change pattern (step 5: S5), the user stirs the oil in the oil tank 3 by moving the stirring member 12 in the vertical direction. However (step 6: S6), the oil containing the foreign matter is extracted from the waste oil outlet 11 to the outside (step 7: S7). Thereby, after the foreign matter adhering to the strainer 10 is removed from the strainer 10, the oil containing the foreign matter is drawn out from the waste oil port 11 without being precipitated in the oil tank 3. When the control of the motor 5 based on the change pattern is finished, the motor 5 is stopped and the cleaning operation of the strainer 10 is finished.

FIG. 5 shows an example of a change pattern of the number of rotations of the motor 5 during the cleaning operation of the strainer 10, and an example of changes in the discharge port pressure and the suction port pressure at that time. In FIG. 5, from time 0 to time t
1 shows a change during normal operation in which the motor 5 is controlled to rotate forward, and the normal operation is completed at time t1. During this normal operation, oil in the oil tank 3 is sucked from the suction port 8 of the pump 6 and oil is discharged from the discharge port 7 of the pump 6.

Thereafter, the user replaces the discharge hose with the cleaning hose from time t1 to time t2, and the cleaning operation of the strainer 10 is started at time t2.
In the present embodiment, as shown in FIG. 5, during the cleaning operation of the strainer 10, there is a change pattern in which the rotation speed when the motor 5 is reversely rotated changes so that the rotation speed a <b> 1 and the rotation speed a <b> 2 alternate. Repeated several times. In this change pattern, the time controlled by the rotational speed a1, the rotational speed a
The time to be controlled to 2 and the number of times to be controlled to the rotational speed a1 or the rotational speed a2 are determined, and the change pattern time t0 is determined. When the change pattern in which the rotation speed when the motor 5 is rotated in reverse is changed a plurality of times so that the rotation speed a1 and the rotation speed a2 are alternated during the cleaning operation of the strainer 10 is repeated a plurality of times. Even if controlled based on the above, the hydraulic tank 3 is prevented from overflowing. Therefore, time t2
Then, after the cleaning operation of the strainer 10 is started, the cleaning operation of the strainer 10 based on the change pattern automatically ends at time t3 when the change pattern time t0 has elapsed. Thereafter, the motor 5 is stopped until the time t0 ′ elapses from the time t3, and then the cleaning operation of the strainer 10 based on the second change pattern is automatically started at the time t4. In the second change pattern of FIG. 5, if the rotational speed when the motor 5 is reversely rotated is increased to the rotational speed a1, the suction port pressure exceeds the allowable pressure c0, so the rotational speed of the motor 5 is the rotational speed. It is limited to a3. Therefore, in the second change pattern, the motor 5
Is rotated so that the rotational speed a3 and the rotational speed a2 are alternated.

After the cleaning operation of the strainer 10 is started at time t4, the cleaning operation of the strainer 10 based on the change pattern is automatically ended at time t5 when the time t0 of the second change pattern has elapsed. Thereafter, until the time t0 ′ elapses from time t5, the motor 5
Is stopped, at time t6, the cleaning operation of the strainer 10 based on the third change pattern is automatically started. In the third change pattern of FIG. 5, the suction port pressure is the allowable pressure c.
In order not to exceed 0, the rotational speed when the motor 5 is reversely rotated cannot be made larger than the rotational speed a4. Therefore, at time t7 when the state where the rotational speed when the motor 5 is reversely rotated is equal to or lower than the lower limit rotational speed a0 is continued for the time T0, the controller 2
1 is displayed on the display unit 21a, and the operation of the motor 5 is stopped.

<Characteristics of hydraulic unit of this embodiment>
The hydraulic unit 1 of the present embodiment has the following features.

In the hydraulic unit 1 of the present embodiment, the motor 5 is rotated in the reverse direction, the oil sucked from the discharge port 7 of the pump 6 is discharged from the suction port 8, the discharged oil is supplied to the oil tank 3, and the strainer 10 By allowing the oil to pass from the inner circumference side toward the outer circumference side, the strainer 10 can be cleaned. Therefore, the strainer 10 can be easily cleaned.

In the hydraulic unit 1 according to the present embodiment, the control unit 20 includes the pattern storage unit 20 a that stores a change pattern of the rotation speed and the rotation speed of the motor 5 during the cleaning operation of the strainer 10. By controlling the hour motor 5 based on the change pattern, the strainer 10 can be efficiently cleaned.

In the hydraulic unit 1 of the present embodiment, the control unit 20 controls the motor 5 so that the pressure on the suction port 8 side of the pump 6 during the cleaning operation of the strainer 10 is less than or equal to the allowable pressure c0. When the viscosity of the oil used for the cleaning operation is high or the cleaning hose is thin, the oil seal attached to the shaft penetration of the pump 6 is broken or leaks during the cleaning operation of the strainer 10. Can be prevented.

The hydraulic unit 1 of the present embodiment has a suction port pressure sensor 8a that detects the pressure on the suction port 8 side of the pump 6, and controls the motor 5 based on the pressure detected by the suction port pressure sensor 8a. Thus, it is possible to prevent the oil seal attached to the shaft penetrating portion of the pump 6 from being damaged or leaking.

In the hydraulic unit 1 of the present embodiment, the display unit 21 on which the controller 21 displays an alarm.
For example, when a large amount of foreign matter adheres to the strainer 10 and cannot be removed, the motor 5
When the rotation speed becomes equal to or lower than the lower limit rotation speed a0 and the time T0 has elapsed, an alarm indicating that the strainer 10 cannot be cleaned can be displayed on the display unit 21a to notify the user.

The hydraulic unit 1 according to the present embodiment includes the stirring member 12 that stirs the oil in the oil tank 3. Therefore, the oil tank 3 is moved by the stirring member 12 before or during the cleaning of the strainer 10.
The foreign matter that has settled inside can be stirred and oil containing the foreign matter can be effectively extracted from the waste oil port 11 of the oil tank 3.

As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes meanings equivalent to the scope of claims for patent and all modifications within the scope.

In the above-described embodiment, the case where the cylindrical strainer 10 is used as the filter has been described. However, other filters may be used. Therefore, the filter may be plate-shaped, for example.

In the above-described embodiment, during the cleaning operation of the strainer 10, the change pattern (time t0) in which the rotation speed when the motor 5 is reversely rotated changes alternately between the rotation speed a1 and the rotation speed a2.
However, the change pattern during the cleaning operation of the strainer 10 may be changed. Therefore, the change pattern (time t0) does not have to be repeated a plurality of times. Further, the time controlled by the rotational speed a1 in the change pattern, the time controlled by the rotational speed a2, the number of times controlled by the rotational speed a1 or the rotational speed a2, and the time t0 of the change pattern may be changed. Therefore, during the cleaning operation of the strainer 10, the rotational speed of the motor 5 and the change pattern of the rotational speed may be arbitrarily changed.

In the above-described embodiment, the description has been given of the case where the control unit 20 limits the rotation speed of the motor 5 so that the pressure on the suction port 8 side of the pump 6 during the cleaning operation of the strainer 10 is set to the allowable pressure c0 or less. The rotational speed of the motor 5 does not have to be limited so that the pressure on the suction port 8 side of the pump 6 during the cleaning operation of the strainer 10 is equal to or less than the allowable pressure c0. When the motor 5 is controlled so that the pressure on the suction port 8 side of the pump 6 is less than or equal to the allowable pressure c0, the current or torque flowing through the motor 5 may be limited without limiting the rotation speed of the motor 5.

In the above-described embodiment, the suction port pressure sensor 8a that detects the pressure on the suction port 8 side is provided, and the pressure on the suction port 8 side of the pump 6 is adjusted based on the pressure detected by the suction port pressure sensor 8a. Although the case where the motor 5 is controlled to be equal to or lower than the allowable pressure c0 has been described, for example, the control unit 20 includes a pressure estimation unit that estimates the pressure on the suction port 8 side of the pump 6 from the torque of the motor 5. Therefore, the control unit 20 may control the motor 5 based on the pressure estimated by the pressure estimation unit. At this time, by controlling the motor based on the pressure estimated from the torque of the motor 5, without using the suction port pressure sensor 8a that detects the pressure on the suction port 8 side of the pump 6,
It is possible to prevent the oil seal attached to the shaft penetrating portion of the pump 6 from being damaged or leaking.

In the pressure estimation means, the method for estimating the pressure on the suction port 8 side of the pump 6 from the torque of the motor 5 may be estimated based on, for example, the current value of the motor 5, or the output power of the motor 5 and the motor 5 It may be estimated based on the rotation speed (output power of the motor 5 / rotation speed of the motor 5), or based on the output power of the motor 5 and the rotation speed of the motor 5 (output power of the motor 5 / rotation speed of the motor 5). May be estimated. Thus, after estimating the torque of the motor 5, the pressure on the suction port 8 side of the pump 6 may be estimated based on the torque of the motor 5 and the pump volume.
Motor shaft torque (Nm) = (pressure (MPa) × pump volume (cc / rev)) / 2π

In the above-described embodiment, the controller 21 of the hydraulic unit 1 has the display unit 21a for notifying the alarm, and the case where the alarm is displayed on the display unit 21a is notified to the user. The unit 1 may have notification means (for example, notification by sound) other than the display unit, and an alarm may be notified by the notification means.

In the above-described embodiment, the case where the operation based on the change pattern is automatically repeated a plurality of times when the cleaning operation of the strainer 10 is started has been described. For example, the cleaning operation of the strainer 10 is performed by the user of the controller. It is performed only when the cleaning operation key is pressed, and when the cleaning operation key of the controller is not pressed, the cleaning operation of the strainer 10 may be interrupted.

In the above-described embodiment, the case where the hydraulic unit 1 includes the stirring member 12 as the stirring unit has been described. However, the hydraulic unit 1 may not include the stirring member 12. In the case where the hydraulic unit 1 has the stirring member 12 as the stirring means, the configuration of the stirring member 12 may be changed without being limited to the case where the stirring member 12 has a spiral portion. Therefore, the stirring member 12 may be, for example, a flat plate shape or a mesh portion.
In addition to the stirring member 12, for example, the stirring means has a discharge port for discharging an air flow disposed in the oil tank 3, and stirs the oil in the oil tank 3 by the air flow discharged from the discharge port. It's okay. At this time, the cleaning ability of the strainer 10 can be improved by disposing the discharge port for discharging the air flow on the bottom surface of the strainer 10 or the oil tank 3. The stirring member 12 is not limited to being moved by the user, and may be moved automatically.

In the above-described embodiment, when the strainer 10 is being cleaned, the oil in the oil tank 3 is stirred while moving the stirring member 12 in the vertical direction, so that the oil containing foreign matter is discharged into the waste oil outlet. Although the case where the strainer 10 is extracted to the outside has been described, the oil in the oil tank 3 may not be stirred when the strainer 10 is being cleaned. Does not have to be extracted from the outside. Therefore, after the cleaning operation of the strainer 10 is completed, the oil in the oil tank 3 is agitated, and the oil containing foreign matters does not have to be extracted from the waste oil port 11 to the outside.

In the above-described embodiment, when the cleaning operation of the strainer 10 is performed, the case where the waste oil port 11 is opened and the oil is extracted from the waste oil port 11 has been described. However, the cleaning operation of the strainer 10 is performed. At this time, the waste oil port 11 is blocked, and the oil does not have to be extracted from the waste oil port 11.

In the above embodiment, when the cleaning operation of the strainer 10 is performed, the case where the oil in the container containing the cleaning oil is sucked into the discharge port 7 of the pump 6 by the cleaning hose is described. Before the cleaning operation of the strainer 10 is performed, the oil in the oil tank 3 of the hydraulic unit 1 is not drawn out from the waste oil port 11 and the oil in the oil tank 3 (the oil on the inner peripheral side of the strainer 10). May be sucked into the discharge port 7 of the pump 6.

  If the present invention is used, the filter can be easily cleaned.

1 Hydraulic unit 3 Oil tank 5 Motor 6 Pump 7 Discharge port 8 Suction port 8a Suction port pressure sensor (pressure sensor)
10 Strainer (filter)
12 Stirring member (stirring means)
20 Control unit (control means)
20a Pattern storage unit (storage means)
21a Display section (notification means)

Claims (13)

A pump for sucking oil supplied from an oil tank through the suction port and discharging it from the discharge port;
A motor that can be switched between forward rotation and reverse rotation, and that drives the pump;
Control means for controlling the motor,
In the oil tank, when the motor is controlled to rotate forward, a filter through which oil before being supplied to the pump passes in a predetermined direction is disposed,
When the motor is controlled to rotate in the reverse direction, the pump discharges oil sucked from the discharge port from the suction port, and the discharged oil is supplied to the oil tank so that the filter is The filter is cleaned by passing in a direction opposite to the direction ,
The control means stores a change pattern of the rotation speed of the motor when the filter is cleaned.
A hydraulic unit comprising storage means for performing 2. The hydraulic unit according to claim 1 , wherein the control unit controls the motor so that a pressure on the suction port side of the pump at the time of cleaning the filter is equal to or lower than a predetermined pressure. A pressure sensor for detecting the pressure on the suction port side of the pump;
The hydraulic unit according to claim 2 , wherein the control unit controls the motor based on a pressure detected by the pressure sensor. Pressure estimation means for estimating the pressure on the suction port side of the pump from the torque of the motor;
3. The hydraulic unit according to claim 2 , wherein the control unit controls the motor based on the pressure estimated by the pressure estimation unit. Having a notification means for reporting an alarm;
Wherein, when the rotation speed of the motor falls below the lower limit rotation speed, alarm according to any of claims 1 4, wherein the controller controls the notifying unit so as to be informed hydraulic unit. Claim, characterized in that it has a stirring means for stirring the liquid in the oil tank 1 5
The hydraulic unit according to any one of the above. A pump for sucking oil supplied from an oil tank through the suction port and discharging it from the discharge port;
A motor that can be switched between forward rotation and reverse rotation, and that drives the pump;
Control means for controlling the motor,
In the oil tank, when the motor is controlled to rotate forward, a filter through which oil before being supplied to the pump passes in a predetermined direction is disposed,
When the motor is controlled to rotate in the reverse direction, the pump discharges oil sucked from the discharge port from the suction port, and the discharged oil is supplied to the oil tank so that the filter is The filter is cleaned by passing in a direction opposite to the direction ,
The control means sets the pressure on the suction port side of the pump during cleaning of the filter to a predetermined pressure.
A hydraulic unit that controls the motor as described below . A pressure sensor for detecting the pressure on the suction port side of the pump;
The hydraulic unit according to claim 7 , wherein the control unit controls the motor based on a pressure detected by the pressure sensor. Pressure estimation means for estimating the pressure on the suction port side of the pump from the torque of the motor;
The hydraulic unit according to claim 7 , wherein the control unit controls the motor based on the pressure estimated by the pressure estimation unit. Having a notification means for reporting an alarm;
Wherein, when the rotation speed of the motor falls below the lower limit rotational speed, according to any one of claims 7-9, wherein the controller controls the notifying unit so alarm is informed hydraulic unit. The hydraulic unit according to any one of claims 7 to 10 , further comprising stirring means for stirring the liquid in the oil tank. A pump for sucking oil supplied from an oil tank through the suction port and discharging it from the discharge port;
A motor that can be switched between forward rotation and reverse rotation, and that drives the pump;
Control means for controlling the motor ;
An informing means for informing an alarm ,
In the oil tank, when the motor is controlled to rotate forward, a filter through which oil before being supplied to the pump passes in a predetermined direction is disposed,
When the motor is controlled to rotate in the reverse direction, the pump discharges oil sucked from the discharge port from the suction port, and the discharged oil is supplied to the oil tank so that the filter is The filter is cleaned by passing in a direction opposite to the direction ,
The control means reports an alarm when the rotation speed of the motor becomes lower than the lower limit rotation speed.
A hydraulic unit characterized by controlling said notifying means as known . The hydraulic unit according to claim 12 , further comprising stirring means for stirring the liquid in the oil tank.

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