CN113983009B - Fan rotation speed control system, fan rotation speed control method and engineering machinery - Google Patents
Fan rotation speed control system, fan rotation speed control method and engineering machinery Download PDFInfo
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- CN113983009B CN113983009B CN202111262464.6A CN202111262464A CN113983009B CN 113983009 B CN113983009 B CN 113983009B CN 202111262464 A CN202111262464 A CN 202111262464A CN 113983009 B CN113983009 B CN 113983009B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 239000003921 oil Substances 0.000 claims description 92
- 239000010720 hydraulic oil Substances 0.000 claims description 34
- 238000010276 construction Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 8
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
- F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
- F15B11/044—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the return line, i.e. "meter out"
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/042—Controlling the temperature of the fluid
- F15B21/0423—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a fan rotating speed control system, a fan rotating speed control method and engineering machinery, wherein the fan rotating speed control system comprises: the first hydraulic motor is suitable for driving the fan to rotate; the cooling pump is connected with the first hydraulic motor through a first pipeline; the first reversing valve is suitable for being connected with the movable arm oil cylinder or the bucket rod oil cylinder, and an oil return port of the first reversing valve is communicated with the first pipeline through a second pipeline; the switch structure is arranged on the second pipeline; and the control device is connected with the cooling pump and the switch structure. The structure can utilize high-pressure oil generated when the movable arm and the bucket rod descend to provide power for the first hydraulic motor and assist in driving the fan to rotate, so that the energy-saving effect is achieved.
Description
Technical Field
The invention relates to the technical field of heat dissipation devices, in particular to a fan rotating speed control system, a fan rotating speed control method and engineering machinery.
Background
The excavator is a common engineering machine. At present, the radiator of the excavator is cooled by using a fan, and the fan is driven by a hydraulic motor. The rotation speed control of the fan is often controlled according to the temperature of hydraulic oil, and the lower the temperature of the hydraulic oil is, the slower the rotation speed of the fan is, and the higher the temperature of the hydraulic oil is, the faster the rotation speed of the fan is. In the prior art, all high-pressure hydraulic oil input into a hydraulic motor for driving a fan is conveyed through a cooling pump, but in the actual work of an excavator, high-pressure oil in a small cavity of an arm cylinder and a large cavity of a movable arm cylinder directly flows back to an oil tank in the processes of retraction of the arm and lowering of the movable arm, and the partial energy is not fully utilized.
Disclosure of Invention
Accordingly, the present invention provides a fan rotational speed control system of a construction machine, a control method thereof, and a construction machine, which can utilize the energy of hydraulic oil when a boom and an arm are lowered.
In order to solve the above problems, the present invention provides a fan rotation speed control system, comprising: the first hydraulic motor is suitable for driving the fan to rotate; the cooling pump is connected with the first hydraulic motor through a first pipeline; the first reversing valve is suitable for being connected with the movable arm oil cylinder or the bucket rod oil cylinder, and an oil return port of the first reversing valve is communicated with the first pipeline through a second pipeline; the switch structure is arranged on the second pipeline; and the control device is connected with the cooling pump and the switch structure.
Optionally, the switch structure is a second reversing valve, and the fan speed control system further comprises a throttle valve and/or a pressure reducing valve arranged on the second pipeline.
Optionally, the fan rotating speed control system further comprises an oil return pipeline, the oil return port of the first reversing valve is communicated with the oil return pipeline through a third pipeline, the second pipeline is communicated with the oil return pipeline, a radiator is arranged on the oil return pipeline, and the fan is matched with the radiator.
Optionally, the fan rotating speed control system further comprises a second reversing valve and a second hydraulic motor, the second reversing valve is connected with the second hydraulic motor, and an oil return port of the second reversing valve is communicated with the oil return pipeline.
Optionally, the second hydraulic motor is a walking motor or a swing motor.
Optionally, the fan rotation speed control system further comprises a rotation speed sensor and a temperature sensor, the rotation speed sensor is suitable for detecting the rotation speed of the fan, the temperature sensor is suitable for detecting the temperature of hydraulic oil, and the control device is connected with the rotation speed sensor and the temperature sensor.
The invention also provides a fan rotating speed control method, wherein the fan is driven by a first hydraulic motor, the first hydraulic motor is connected with the cooling pump by a first pipeline, and the control method comprises the following steps: when the working arm of the engineering machinery descends, a second pipeline between the movable arm oil cylinder or the bucket rod oil cylinder and the first hydraulic motor is controlled to be conducted according to the rotating speed of the fan and/or the temperature of hydraulic oil, so that return oil in the movable arm oil cylinder or the bucket rod oil cylinder is conducted into the first hydraulic motor, the rotating speed of the fan is increased, or the power of the cooling pump is reduced.
Optionally, the control method further includes: when the rotating speed of the fan is smaller than a preset value, the return oil in the movable arm oil cylinder or the bucket rod oil cylinder is led into the first hydraulic motor; and/or when the temperature of the hydraulic oil is greater than a preset value, introducing the return oil in the movable arm oil cylinder or the bucket rod oil cylinder into the first hydraulic motor.
Optionally, the fan rotation speed control method further includes: when the temperature of the hydraulic oil is higher than a preset value, maintaining the power of the cooling pump unchanged, and introducing return oil in the movable arm oil cylinder or the bucket rod oil cylinder into the first hydraulic motor to increase the rotating speed of the fan; or after receiving the pilot signal of the working arm of the engineering machine, introducing the return oil in the movable arm oil cylinder or the bucket rod oil cylinder into the first hydraulic motor, and reducing the power of the cooling pump so as to maintain the rotation speed of the fan unchanged.
The invention also provides engineering machinery, which comprises the fan rotating speed control system; alternatively, the construction machine comprises a controller adapted to perform the above-described fan speed control method.
The invention has the following advantages:
by adopting the technical scheme, the oil return port of the first reversing valve is communicated with the first pipeline through the second pipeline, when the movable arm and the bucket rod descend, high-pressure hydraulic oil can flow into the first pipeline through the oil return port of the first reversing valve and the second pipeline, and then the high-pressure hydraulic oil flows into the first hydraulic motor through the first pipeline and provides power for the first hydraulic motor. The switch structure can actually work to control whether high-pressure oil generated when the movable arm and the bucket rod descend provides power for the first hydraulic motor or not. The structure can utilize high-pressure oil generated when the movable arm and the bucket rod descend to provide power for the first hydraulic motor and assist in driving the fan to rotate, so that the energy-saving effect is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a fan speed control system of the present invention; and
FIG. 2 is a flow chart of a control method of the fan speed control system of the present invention;
reference numerals illustrate:
10. a first hydraulic motor; 20. a fan; 30. a cooling pump; 40. a first pipeline; 50. a first reversing valve; 60. a boom cylinder; 70. a bucket rod oil cylinder; 80. a second pipeline; 90. a switch structure; 100. an oil return pipeline; 110. a third pipeline; 120. a heat sink; 130. a second reversing valve; 140. a second hydraulic motor; 150. a rotation speed sensor; 160. a temperature sensor; 170. a control device; 180. a first main pump; 190. and a second main pump.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the fan speed control system of the construction machine of the present embodiment includes a first hydraulic motor 10, a fan 20, a cooling pump 30, a first directional valve 50, and a switching structure 90. Wherein the first hydraulic motor 10 is adapted to drive the fan 20 in rotation. The cooling pump 30 is connected to the first hydraulic motor 10 via a first line 40. First directional valve 50 is adapted to be connected to boom cylinder 60 or arm cylinder 70, and the return port of first directional valve 50 communicates with first line 40 via second line 80. A switch structure 90 is provided on the second conduit 80.
With the technical solution of the present embodiment, the oil return port of the first directional valve 50 is communicated with the first pipeline 40 through the second pipeline 80, and when the boom and the arm are lowered, the high-pressure hydraulic oil can flow into the first pipeline 40 through the oil return port of the first directional valve 50 and the second pipeline 80, and then the high-pressure hydraulic oil flows into the first hydraulic motor 10 through the first pipeline 40 and provides power to the first hydraulic motor 10. The switch structure 90 may actually operate to control whether the first hydraulic motor 10 is powered by high-pressure oil generated when the boom and arm are lowered. The above structure can provide power to the first hydraulic motor 10 by using high pressure oil generated when the boom and the arm are lowered, and assist in driving the fan 20 to rotate, thereby achieving an energy saving effect.
The first selector valve 50 is used to connect to the boom cylinder 60 or the arm cylinder 70. As will be appreciated by those skilled in the art, when the arm of the excavator is lowered, the high pressure hydraulic oil in the rodless chamber of boom cylinder 60 is discharged from the oil return port of first directional valve 50 or the high pressure hydraulic oil in the rod chamber of stick cylinder 70 is discharged from the oil return port of first directional valve 50 by the force of gravity. The high-pressure hydraulic oil flows to the second pipeline 80, flows from the second pipeline 80 to the first pipeline 40, and finally flows into the first hydraulic motor 10, so as to play a role in assisting in driving the fan 20 to rotate.
As can be seen from fig. 1, the first reversing valve 50 is a three-position four-way reversing valve, and those skilled in the art can adjust the specific structure of the first reversing valve 50 according to actual needs.
As shown in fig. 1, in the technical solution of the present embodiment, the switch structure 90 is a second reversing valve. Specifically, as can be seen in FIG. 1, the switching mechanism 90 is a two-position, two-way reversing valve. When the second directional valve is in the left position, the second line 80 is in a blocked state, and hydraulic oil cannot flow to the first line 40 through the second line 80. When the second directional valve is in the right position, hydraulic oil can now flow through the second line 80 to the first line 40 and to the first hydraulic motor 10, thereby providing an energy saving effect.
In some other embodiments, not shown, the switch structure 90 may be other structures that can shut off or conduct a pipeline, for example, the switch structure 90 may be a valve, etc.
Preferably, the fan speed control system further includes a throttle and/or a pressure relief valve disposed on the second conduit 80. Specifically, the flow rate of the high-pressure hydraulic oil through the second pipe 80 can be stabilized by providing a throttle valve or a pressure reducing valve on the second pipe 80. Further, a throttle valve and a pressure reducing valve may be provided at the same time. Further, the throttle valve and the pressure reducing valve described above may be provided at an upstream position or a downstream position of the switch structure 90.
As shown in fig. 1, in the technical solution of the present embodiment, the fan rotation speed control system further includes an oil return line 100. The oil return port of the first reversing valve 50 is communicated with the oil return pipeline 100 through a third pipeline 110, the second pipeline 80 is communicated with the oil return pipeline 100, a radiator 120 is arranged on the oil return pipeline 100, and the fan 20 is matched with the radiator 120. Specifically, the scavenge line 100 is adapted to return scavenge hydraulic oil in the system to the tank. Further, the radiator 120 is located at a position downstream of the connection point of the third pipe 110 and the return pipe 100.
As can be seen from fig. 1, the return port of the first directional valve 50 is connected to the return line 100 via a third line 110. When the switch structure 90 is in the closed state, the return oil of the first reversing valve 50 flows into the oil tank after passing through the radiator 120. When the switch structure 90 is in the open state, the distributed return oil of the first reversing valve 50 flows into the oil tank after passing through the radiator 120, and the other part of the return oil flows into the first pipeline 40 through the second pipeline 80, flows into the first hydraulic motor 10, and drives the fan 20.
Further, as can be seen from fig. 1, the return line 100 is provided with a one-way valve between the radiator 120 and the connection end of the return line 100 and the second line 80.
As shown in fig. 1, in the technical solution of the present embodiment, the fan rotation speed control system further includes a second reversing valve 130 and a second hydraulic motor 140. The second directional valve 130 is connected to the second hydraulic motor 140, and the oil return port of the second directional valve 130 is in communication with the oil return line 100. Specifically, when the switch structure 90 is in the off state, the return oil of the second reversing valve 130 flows into the tank after passing through the radiator 120. When the switch structure 90 is in the open state, part of the return oil of the second reversing valve 130 flows into the oil tank after passing through the radiator 120, and the other part of the return oil flows into the first pipeline 40 through the second pipeline 80, flows into the first hydraulic motor 10, and drives the fan 20.
Preferably, the second hydraulic motor 140 is a walking motor or a swing motor. Of course, the second hydraulic motor 140 may be another driving mechanism.
As shown in fig. 1, in the technical solution of the present embodiment, the fan rotation speed control system further includes a rotation speed sensor 150 and a temperature sensor 160. The rotational speed sensor 150 is adapted to detect the rotational speed of the fan 20, the temperature sensor 160 is adapted to detect the temperature of the hydraulic oil, and the fan rotational speed control system further comprises a control device 170, the control device 170 being connected to the cooling pump 30, the switching structure 90, the rotational speed sensor 150 and the temperature sensor 160.
Specifically, the specific conditions of the radiator 120 and the fan 20 can be determined from the detection data of the rotation speed sensor 150 and the temperature sensor 160, thereby determining whether or not it is necessary to introduce the high hydraulic oil generated when the boom and the arm are lowered to the first hydraulic motor 10. Further, the control device 170 may control the output power of the cooling pump 30, and the switch structure 90-bit electromagnetic directional valve, and the control device 170 may control the power-on and power-off states of the electromagnetic directional valve, thereby controlling the gear of the electromagnetic directional valve.
Further, as can be seen from fig. 1, the fan speed control system in the present embodiment further includes a first main pump 180 and a second main pump 190. Wherein the first main pump 180 is connected to the second reversing valve 130 via a pipeline, the first main pump 180 being adapted to provide hydraulic power to the second hydraulic motor 140. Second main pump 190 is connected to first reversing valve 50 via a line, and second main pump 190 is adapted to provide hydraulic power to boom cylinder 60 or arm cylinder 70.
As shown in fig. 2, the present embodiment further provides a method for controlling a fan speed of an engineering machine, where the method is adapted to control the fan speed control system of the engineering machine, and the method includes:
when the working arm of the construction machine descends, the open/close state of the switch structure 90 is controlled according to the rotation speed of the fan 20 and/or the temperature of the hydraulic oil, and the return oil in the boom cylinder 60 or the arm cylinder 70 is introduced into the first hydraulic motor 10.
Specifically, when the working arm of the construction machine is lowered, the boom is lowered and the arm is retracted, and high-pressure hydraulic oil exists in the rodless chamber of the boom cylinder 60 and the rod-containing chamber of the arm cylinder 70. At this time, the working conditions of the fan 20 and the radiator 120 are determined according to the rotation speed of the fan 20 and the temperature of the hydraulic oil, so as to control the on or off of the switch structure 90. When the switch structure 90 is in the closed state, the return oil of the first reversing valve 50 flows into the oil tank after passing through the radiator 120. When the switch structure 90 is in the open state, the distributed return oil of the first reversing valve 50 flows into the oil tank after passing through the radiator 120, and the other part of the return oil flows into the first pipeline 40 through the second pipeline 80, flows into the first hydraulic motor 10, and drives the fan 20.
Further, in the control method described above, "controlling the open/close state of the switch structure 90 according to the rotation speed of the fan 20 and/or the temperature of the hydraulic oil" includes four cases:
1. as shown in fig. 2, the power of the cooling pump 30 is unchanged, and the switching structure 90 is in an open state to increase the rotation speed of the fan 20.
At this time, when the power of the cooling pump 30 is not changed, the rotation speed of the fan 20 is increased, thereby improving the heat dissipation effect.
2. As shown in fig. 2, the rotational speed of the fan 20 is unchanged, the switching structure 90 is in an open state, and the power of the cooling pump 30 is reduced.
When receiving the pilot signal for lowering the working arm of the construction machine, the return oil in boom cylinder 60 or arm cylinder 70 is introduced into first hydraulic motor 10. At this time, the rotation speed of the fan 20 is maintained (of course, the rotation speed of the fan 20 may be increased), the rotation speed of the cooling pump 30 is appropriately reduced, and the energy saving effect of reducing the power of the cooling pump 30 is achieved. In this control mode, the control device 170 obtains the flow rate of the switching structure 90, calculates the power of the cooling pump 30 required to be reduced to maintain the rotation speed of the fan 20, and finally controls the cooling pump 30.
3. As shown in fig. 2, when the rotation speed of the fan 20 is less than the preset value, the switch structure 90 is in an open state.
At this time, when the rotation speed of the fan 20 is reduced and is less than a preset value, the switching structure 90 is opened, thereby achieving an increase in the rotation speed of the fan 20 without increasing the power of the cooling pump 30 and an increase in the heat dissipation effect.
4. As shown in fig. 2, when the temperature of the hydraulic oil is greater than the preset value, the switch structure 90 is in an open state.
At this time, when the temperature of the hydraulic oil is too high, the switch structure 90 is opened and increases the rotation speed of the fan 20, thereby improving the heat dissipation effect and reducing the temperature of the hydraulic oil.
Further, the four control modes can be used alone or in combination.
The embodiment also provides engineering machinery comprising the fan rotating speed control system. Further, the construction machine is an excavator, the excavator includes a boom and an arm, the boom cylinder 60 is adapted to drive the boom to swing with respect to the vehicle body, and the arm cylinder 70 is adapted to drive the arm to swing with respect to the boom.
Further, the construction machine may further include a controller, where the controller is configured to execute the above-described method for controlling the rotational speed of the fan.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. A fan speed control system, comprising:
a first hydraulic motor (10) and a fan (20), the first hydraulic motor (10) being adapted to drive the fan (20) in rotation;
-a cooling pump (30), the cooling pump (30) being connected to the first hydraulic motor (10) by a first conduit (40);
a first reversing valve (50), the first reversing valve (50) is suitable for being connected with a movable arm oil cylinder (60) or a bucket rod oil cylinder (70), and an oil return port of the first reversing valve (50) is communicated with the first pipeline (40) through a second pipeline (80);
a switch structure (90) disposed on the second conduit (80);
the control device (170), the control device (170) with cooling pump (30) with switch structure (90) all are connected, when the work arm of engineering machine tool descends, according to the rotational speed of fan (20) and/or the temperature of hydraulic oil, control swing arm hydro-cylinder (60) or bucket rod hydro-cylinder (70) and first hydraulic motor (10) second pipeline (80) switch on to in with swing arm hydro-cylinder (60) or bucket rod hydro-cylinder (70) return oil lets in first hydraulic motor (10) to improve the rotational speed of fan (20) or reduce the power of cooling pump (30).
2. Fan speed control system according to claim 1, characterized in that the switching structure (90) is a second reversing valve, the fan speed control system further comprising a throttle valve and/or a pressure reducing valve arranged on the second conduit (80).
3. The fan speed control system according to claim 1, further comprising an oil return line (100), wherein an oil return port of the first reversing valve (50) communicates with the oil return line (100) through a third line (110), the second line (80) communicates with the oil return line (100), a radiator (120) is provided on the oil return line (100), and the fan (20) cooperates with the radiator (120).
4. A fan speed control system according to claim 3, further comprising a second reversing valve (130) and a second hydraulic motor (140), the second reversing valve (130) being connected to the second hydraulic motor (140), an oil return port of the second reversing valve (130) being in communication with the oil return line (100).
5. The fan rotational speed control system of claim 4, wherein the second hydraulic motor (140) is a travel motor or a swing motor.
6. The fan speed control system according to claim 1, further comprising a speed sensor (150) and a temperature sensor (160), the speed sensor (150) being adapted to detect the speed of the fan (20), the temperature sensor (160) being adapted to detect the temperature of the hydraulic oil, the control device (170) being connected to both the speed sensor (150) and the temperature sensor (160).
7. A method of controlling the rotational speed of a fan (20) driven by a first hydraulic motor (10), the first hydraulic motor (10) being connected to a cooling pump (30) by a first line (40), the method comprising:
when the working arm of the engineering machinery descends, a second pipeline (80) between the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) and the first hydraulic motor (10) is controlled to be conducted according to the rotating speed of the fan (20) and/or the temperature of hydraulic oil, so that return oil in the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) is led into the first hydraulic motor (10), and the rotating speed of the fan (20) is increased, or the power of the cooling pump (30) is reduced.
8. The fan rotational speed control method of claim 7, wherein the control method further comprises:
when the rotating speed of the fan (20) is smaller than a preset value, the oil return in the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) is led into the first hydraulic motor (10); and/or the number of the groups of groups,
when the temperature of the hydraulic oil is greater than a preset value, the return oil in the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) is introduced into the first hydraulic motor (10).
9. The fan rotational speed control method as recited in claim 7, wherein the fan rotational speed control method further comprises:
when the temperature of the hydraulic oil is greater than a preset value, maintaining the power of the cooling pump (30) unchanged, and introducing return oil in the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) into the first hydraulic motor (10) so as to increase the rotating speed of the fan (20); or alternatively, the process may be performed,
after receiving a pilot signal of the working arm of the engineering machinery, the return oil in the movable arm oil cylinder (60) or the bucket rod oil cylinder (70) is led into the first hydraulic motor (10), and the power of the cooling pump (30) is reduced, so that the rotating speed of the fan (20) is kept unchanged.
10. A construction machine comprising the fan rotation speed control system according to any one of claims 1 to 6; alternatively, the working machine comprises a controller adapted to perform the fan speed control method according to any one of claims 7 to 9.
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| CN202111262464.6A CN113983009B (en) | 2021-10-28 | 2021-10-28 | Fan rotation speed control system, fan rotation speed control method and engineering machinery |
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| CN202111262464.6A CN113983009B (en) | 2021-10-28 | 2021-10-28 | Fan rotation speed control system, fan rotation speed control method and engineering machinery |
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| CN113983009A CN113983009A (en) | 2022-01-28 |
| CN113983009B true CN113983009B (en) | 2023-10-27 |
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