Oil pressure system
阅读说明:本技术 油压系统 (Oil pressure system ) 是由 近藤哲弘 于 2018-05-18 设计创作,主要内容包括:油压系统具备:随着从第一及第二操作装置输出的操作信号越大而输出越高的二次压的第一及第二电磁比例阀;在第一电磁比例阀未正常发挥功能时随着第一操作装置的操作量越大而输出越高的二次压,在第二电磁比例阀未正常发挥功能时随着第二操作装置的操作量越大而输出越高的二次压的第三电磁比例阀;选择从第一电磁比例阀输出的二次压与从第三电磁比例阀输出的二次压中的高的一方来导向第一泵用第一调节器的第一高压选择阀;以及选择从第二电磁比例阀输出的二次压与从第三电磁比例阀输出的二次压中的高的一方来导向第二泵用第二调节器的第二高压选择阀。(The hydraulic system includes a and a second electromagnetic proportional valve that output higher secondary pressures as operation signals output from and a second operation device become larger, a third electromagnetic proportional valve that output higher secondary pressures as an operation amount of a operation device becomes larger when a electromagnetic proportional valve does not function normally, and output higher secondary pressures as an operation amount of a second operation device becomes larger when a second electromagnetic proportional valve does not function normally, a high-pressure selector valve that selects a side higher between the secondary pressure output from a -th electromagnetic proportional valve and the secondary pressure output from the third electromagnetic proportional valve and that leads the secondary pressure to an -th regulator, and a second high-pressure selector valve that selects a side higher between the secondary pressure output from the second electromagnetic proportional valve and the secondary pressure output from the third electromagnetic proportional valve and that leads the secondary pressure to a second regulator for the pump.)
An type hydraulic system, comprising:
-th and second operation devices that output operation signals corresponding to the amount of operation on the operation unit;
a th pump of a variable displacement type for supplying the working oil to the th hydraulic actuator via an th control valve;
a regulator that increases a tilting angle of the th pump as a control pressure increases;
a variable displacement type second pump that supplies the working oil to the second hydraulic actuator via the second control valve;
a second regulator that increases a tilting angle of the second pump as the control pressure increases;
a electromagnetic proportional valve that outputs a higher secondary pressure as the operation signal output from the th operation device is larger;
a second electromagnetic proportional valve that outputs a higher secondary pressure as the operation signal output from the second operation device is larger;
a third electromagnetic proportional valve that outputs a higher secondary pressure as an operation signal output from the th operation device is larger when the th electromagnetic proportional valve is not functioning normally, and outputs a higher secondary pressure as an operation signal output from the second operation device is larger when the second electromagnetic proportional valve is not functioning normally;
a th high pressure selector valve, said th high pressure selector valve selecting a th side of the secondary pressure output from said th electromagnetic proportional valve and the secondary pressure output from said third electromagnetic proportional valve as said control pressure and leading to said th regulator, and
a second high pressure selector valve that selects a higher side of the secondary pressure output from the second electromagnetic proportional valve and the secondary pressure output from the third electromagnetic proportional valve as the control pressure and that leads to the second regulator.
2. The oil hydraulic system of claim 1,
a control device for supplying a drive current to the th electromagnetic proportional valve, the second electromagnetic proportional valve, and the third electromagnetic proportional valve;
the control device changes the drive current to be supplied to the third electromagnetic proportional valve in accordance with the operation signal output from the operation device when it is determined that the electromagnetic proportional valve does not function normally based on monitoring of the drive current to be supplied to the th electromagnetic proportional valve, changes the drive current to be supplied to the third electromagnetic proportional valve in accordance with the operation signal output from the second operation device when it is determined that the second electromagnetic proportional valve does not function normally based on monitoring of the drive current to be supplied to the second electromagnetic proportional valve, and sets the drive current to be supplied to the third electromagnetic proportional valve to zero when it is determined that both the electromagnetic proportional valve and the second electromagnetic proportional valve function normally.
3, oil pressure system, characterized in that,
th operating device and second operating device outputting operation signal corresponding to operation amount of the operating part;
a th pump of a variable displacement type for supplying the working oil to the th hydraulic actuator via an th control valve;
a regulator that increases a tilting angle of the th pump as a control pressure increases;
a variable displacement type second pump that supplies the working oil to the second hydraulic actuator via the second control valve;
a second regulator that increases a tilting angle of the second pump as the control pressure increases;
a -th electromagnetic proportional valve connected to the -th regulator via an -th secondary pressure line, for pressurizing a higher secondary pressure as the control pressure to the -th regulator output as the operation signal output from the -th operation device is larger;
a second electromagnetic proportional valve connected to the second regulator via a second secondary pressure line, the higher secondary pressure being output as the control pressure to the second regulator as the operation signal output from the second operation device is larger;
a th switching valve provided in a form of cutting off the th secondary pressure line into a th upstream flow path on the th electromagnetic proportional valve side and a th downstream flow path on the th regulator side;
a second switching valve provided in a form of cutting off the second secondary pressure line into a second upstream flow path on the second electromagnetic proportional valve side and a second downstream flow path on the second regulator side; and
a control device for supplying a drive current to the st electromagnetic proportional valve in such a manner that the st electromagnetic proportional valve outputs a secondary pressure between a minimum value and a maximum value larger than a th set value in accordance with an operation signal output from the th operation device, and supplying a drive current to the second electromagnetic proportional valve in such a manner that the second electromagnetic proportional valve outputs a secondary pressure between a minimum value and a maximum value larger than a second set value in accordance with an operation signal output from the second operation device;
the switching valve is connected to the second upstream path through a relay path, blocks the upstream path and communicates the relay path with the downstream path in the case of a neutral position, and switches to an operating position for communicating the upstream path with the downstream path and blocking the relay path by using a secondary pressure of the electromagnetic proportional valve when the secondary pressure exceeds the setting value;
a second switching valve connected to the th upstream path through a second relay path, and configured to block the second upstream path and communicate the second relay path with the second downstream path in a neutral position, and configured to switch to an operating position in which the second upstream path and the second downstream path are communicated with each other and the second relay path is blocked by a secondary pressure of the second electromagnetic proportional valve when the secondary pressure exceeds the second set value;
the control device controls the second electromagnetic proportional valve in such a manner that the second electromagnetic proportional valve outputs a higher secondary pressure as the operation signal output from the th operation device is larger when it is determined that the st electromagnetic proportional valve does not function normally according to the monitoring of the drive current supplied to the th electromagnetic proportional valve;
and when it is determined that the second electromagnetic proportional valve does not function normally based on the monitoring of the drive current supplied to the second electromagnetic proportional valve, controlling the th electromagnetic proportional valve in such a manner that the th electromagnetic proportional valve outputs a higher secondary pressure as the operation signal output from the second operation device is larger.
Technical Field
The present invention relates to an electric Positive Control (Positive Control) hydraulic system.
Background
Conventionally, an electric positive control type hydraulic system is used in construction machines, industrial machines, and the like. For example, patent document 1 discloses a hydraulic system 100 for a construction machine as shown in fig. 3.
In the hydraulic system 100, the hydraulic oil is supplied from the variable displacement pump 110 to each hydraulic actuator 130 via the control valve 120. The control valve 120 increases the opening area of a passage through which the hydraulic oil is supplied to the hydraulic actuator 130 as the amount of operation of the corresponding operation unit (operation lever in fig. 4) of the operation device 140 increases.
The tilt angle of the pump 110 is adjusted by the adjuster 111. The regulator 111 is connected to an electromagnetic proportional valve 112. The electromagnetic proportional valve 112 outputs a higher secondary pressure as the operation amount of the operation portion of the operation device 140 is larger. Accordingly, the discharge flow rate of the pump 110 increases as the operation amount of the operation unit of the operation device 140 increases.
Disclosure of Invention
The problems to be solved by the invention are as follows:
however, in the hydraulic system 100 shown in fig. 3, when the proportional solenoid valve 112 fails to function normally due to a failure or the like, the secondary pressure of the proportional solenoid valve 112 may become zero. In this case, even when the operation portion of the operation device 140 is operated, the discharge flow rate of the pump 110 is maintained at the minimum discharge flow rate, and the hydraulic actuator 130 cannot be operated at a sufficient speed. To eliminate this problem, it is conceivable, for example, to provide a redundant electromagnetic proportional valve.
The hydraulic system may include a plurality of pumps for supplying the hydraulic actuator with the hydraulic oil. In such a hydraulic system, for example, when a backup electromagnetic proportional valve is provided for each pump, the cost increases.
Therefore, an object of the present invention is to provide a hydraulic system including the th pump and the second pump of the variable displacement type, which can cope with a failure of the electromagnetic proportional valve and the like with an inexpensive configuration.
Means for solving the problems:
to solve the above problems, a 4624 type of hydraulic system according to the present invention provides type of hydraulic system including and a second operation device outputting operation signals according to an operation amount of an operation portion, a variable displacement type pump supplying working oil to a second hydraulic actuator via a control valve, a second 5 regulator increasing a tilt angle of the pump as a control pressure increases, a variable displacement type second pump supplying working oil to the second hydraulic actuator via a second control valve, a second regulator increasing a tilt angle of the second pump as a control pressure increases, a electromagnetic proportional valve outputting a higher secondary pressure as an operation signal output from the operation device is larger, a second electromagnetic proportional valve outputting a higher secondary pressure as an operation signal output from the second operation device is larger, a third electromagnetic proportional valve outputting a higher secondary pressure as an operation signal output from the second electromagnetic proportional valve is larger when the second electromagnetic proportional valve does not function, and a third electromagnetic proportional valve selecting switch outputting a higher secondary pressure selected from among the second pilot pressure and the second pilot pressure 8934 as a pilot pressure, wherein the second pilot pressure is higher when the second electromagnetic proportional valve is output from the second electromagnetic proportional valve is selected 3637 and the second electromagnetic proportional valve is output as a pilot pressure higher.
According to the above configuration, when the th electromagnetic proportional valve is normal, the th regulator is supplied with the secondary pressure of the 0 th electromagnetic proportional valve, and the tilt angle (discharge flow rate) of the th pump can be controlled by the th electromagnetic proportional valve, and , when the th electromagnetic proportional valve does not function normally and the secondary pressure thereof becomes zero, the th regulator is supplied with the secondary pressure of the third electromagnetic proportional valve in accordance with the operation signal output from the th operation device, and the tilt angle of the th pump increases as the operation signal increases, and as a result, the th hydraulic actuator can be operated at a sufficient speed.
Similarly, when the second electromagnetic proportional valve is normal, the secondary pressure of the second electromagnetic proportional valve is introduced into the second regulator, and the tilt angle (discharge flow rate) of the second pump can be controlled by the second electromagnetic proportional valve, and when the secondary pressure of the second electromagnetic proportional valve becomes zero because the second electromagnetic proportional valve does not function normally, the secondary pressure of the third electromagnetic proportional valve is introduced into the second regulator in accordance with the operation signal output from the second operation device, and the tilt angle of the second pump increases as the operation signal increases, and as a result, the second hydraulic actuator can be operated at a sufficient speed.
In addition, the third electromagnetic proportional valve is a backup for both the th electromagnetic proportional valve and the second electromagnetic proportional valve, so that a trouble of the th electromagnetic proportional valve and the second electromagnetic proportional valve can be dealt with by an inexpensive configuration.
For example, the hydraulic system may further include a control device that supplies a drive current to the th, second, and third electromagnetic proportional valves, wherein the control device changes the drive current to be supplied to the third electromagnetic proportional valve in accordance with an operation signal output from the th operation device when it is determined that the th electromagnetic proportional valve does not function normally based on monitoring of the drive current to be supplied to the th electromagnetic proportional valve, changes the drive current to be supplied to the third electromagnetic proportional valve in accordance with an operation signal output from the second operation device when it is determined that the second electromagnetic proportional valve does not function normally based on monitoring of the drive current to be supplied to the second electromagnetic proportional valve, and sets the drive current to be supplied to the third electromagnetic proportional valve to zero when it is determined that both the th and second electromagnetic proportional valves function normally.
In addition, the invention provides a hydraulic system comprising a 0 operation device and a second operation device which output an operation signal corresponding to an operation amount of an operation portion, a 3 rd pump of a variable displacement type which supplies a working oil to a 2 nd hydraulic actuator via a 1 st control valve, a 5 th regulator which increases a tilt angle of the 4 th pump as a control pressure increases, a second pump of a variable displacement type which supplies a working oil to a second hydraulic actuator via a second control valve, a second regulator which increases a tilt angle of the second pump as a control pressure increases, a second proportional valve which is connected to the 7 th regulator via a 6 th secondary pressure line and which outputs a higher secondary pressure as the control pressure to the 9 th regulator as an operation signal output from the 8 th operation device is larger as the control pressure is output from the 9 th regulator, a second secondary pressure line which is connected to the second regulator as the second relay pressure signal output from the second operation device is larger as the second relay pressure control pressure is higher as the second relay pressure control pressure is output from the second relay pressure control device and the second relay pressure control pressure is higher as the second relay pressure is output from the second relay pressure control device to the upstream side of the second relay pressure control device, the second relay pressure control device is output from the second relay pressure control device, the upstream side of the second relay pressure control device, the second relay pressure control device is set when the second relay pressure control pressure is higher as the second relay pressure control pressure is output from the second relay pressure control device, the second relay pressure control device is output from the upstream side of the second relay pressure control device, the second relay pressure control device is higher as the second relay pressure control device is output from the second relay pressure control device, the upstream side of the upstream relay pressure control device, the second relay pressure control device is set from the second relay pressure control device, the upstream side of the second relay pressure control device is set from the second relay pressure control device, the upstream side of the second relay pressure control device, the second relay pressure control device is set to the upstream side of the upstream relay pressure control device, the second relay pressure control device is set to the second relay pressure control device, the upstream relay pressure control device is set point of the second relay pressure control device, the upstream relay pressure control device is set when the second relay pressure control device is set from the second relay pressure control device, the second relay pressure control device is set point of the second relay pressure control device is set to the second relay pressure control device, the second relay pressure control device is set when the second relay pressure control device, the second relay pressure control device is set to the second relay pressure control device, the second relay pressure control device is set to the second relay pressure control device is set when the second relay pressure control device is set to the second relay pressure control device, the second relay pressure control device is set to the second relay pressure control.
According to the above configuration, when the th electromagnetic proportional valve is normal, the th switching valve is located at the operating position, and the secondary pressure of the 1 th electromagnetic proportional valve is introduced into the 0 th regulator, so that the tilt angle (discharge flow rate) of the th pump can be controlled by the 2 th electromagnetic proportional valve, and on the other hand, , when the th electromagnetic proportional valve does not function normally and the secondary pressure thereof becomes zero, the th switching valve is switched to the neutral position, and the secondary pressure of the second electromagnetic proportional valve corresponding to the operation signal output from the th operation device is introduced into the th regulator, so that the tilt angle of the th pump increases as the operation signal increases, and as a result, the th hydraulic actuator can be operated at a sufficient speed.
Similarly, when the second electromagnetic proportional valve is normal, the second switching valve is located at the operating position, and the secondary pressure of the second electromagnetic proportional valve is introduced into the second regulator, so that the tilt angle (discharge flow rate) of the second pump can be controlled by the second electromagnetic proportional valve, and in addition , when the second electromagnetic proportional valve does not function normally and the secondary pressure thereof becomes zero, the second switching valve is switched to the neutral position, and the secondary pressure of the electromagnetic proportional valve corresponding to the operation signal output from the second operation device is introduced into the second regulator, so that the tilt angle of the second pump increases as the operation signal increases, and as a result, the second hydraulic actuator can be operated at a sufficient speed.
Further, since only the switching valve provided in the th secondary pressure line and the second secondary pressure line is additionally required as compared with the conventional art, it is possible to cope with a failure of the th electromagnetic proportional valve and the second electromagnetic proportional valve with an inexpensive configuration.
The invention has the following effects:
according to the present invention, it is possible to cope with a failure of the electromagnetic proportional valve and the like with an inexpensive configuration in the hydraulic system including the th pump and the second pump of the variable displacement type.
Drawings
Fig. 1 is a schematic configuration diagram of an oil pressure system according to an th embodiment of the present invention;
fig. 2 is a schematic configuration diagram of an oil pressure system according to a second embodiment of the invention;
fig. 3 is a schematic configuration diagram of a hydraulic system of a conventional construction machine.
Detailed Description
(embodiment )
Fig. 1 shows a
Specifically, the
In the illustrated example, the -th
The th and second
The
In the present embodiment, the -th
Similarly, in the present embodiment, the second
The
Similarly, the
The
In the present embodiment, the -
Similarly, the
In the present embodiment, the
The -
Similarly, the
The -th high
Similarly, the second high
The th, second, and third electromagnetic
For example, the
The
Similarly, the
The
More specifically, the
On the other hand, in , when it is determined that the th electromagnetic
When it is determined that the second electromagnetic
As described above, in the
Similarly, when the second electromagnetic
The third electromagnetic
(second embodiment)
Fig. 2 shows a hydraulic system 1b according to a second embodiment of the present invention, and in this embodiment, the same components as those in embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.
In the present embodiment, the
The th secondary pressure line 81 is provided with a switching
Similarly, a
The switching
The switching
The switching
The
The
The th and second electromagnetic
The
Similarly, the
The
When it is determined that the th electromagnetic
As described above, in the
Further, although the discharge flow rate of the second
Similarly, when the second electromagnetic
Further, although the discharge flow rate of the third
Further, since only the switching
(other embodiment)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
Description of the symbols:
1A, 1B oil pressure system;
21 st main pump;
22 th th regulator;
23 a second main pump;
24 a second regulator;
3A th control valve;
3B a second control valve;
4A operating device ;
4B a second operating device;
41. 43 an operation part;
51, electromagnetic proportional valve;
52 a second electromagnetic proportional valve;
53 third electromagnetic proportional valve;
55, electromagnetic proportional valve;
56 a second electromagnetic proportional valve;
61, high pressure selection valve;
65 a second high pressure selector valve;
7 a control device;
th secondary pressure line;
82 a downstream flow path;
83 an upstream flow path;
84, th relay flow path;
85 second secondary pressure pipeline;
86 downstream flow path;
87 an upstream flow path;
88 a second relay flow path;
91 switching valve ;
92 second switching valve.
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