CN111188810A - Hydraulic oil circuit and engineering machinery - Google Patents
Hydraulic oil circuit and engineering machinery Download PDFInfo
- Publication number
- CN111188810A CN111188810A CN202010036368.9A CN202010036368A CN111188810A CN 111188810 A CN111188810 A CN 111188810A CN 202010036368 A CN202010036368 A CN 202010036368A CN 111188810 A CN111188810 A CN 111188810A
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- valve
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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
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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
- F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
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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
- F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
- F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant 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
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
Abstract
A hydraulic oil circuit and engineering machinery relate to the hydraulic technical field and comprise a working oil pump and a heat dissipation oil circuit which are communicated with each other, wherein a control valve, an air cooling motor and a fan are sequentially arranged on the heat dissipation oil circuit, the control valve is communicated, and the air cooling motor drives the fan to rotate; the oil path of the working oil pump is sequentially provided with a pressure cut-off valve, an adjusting plunger and a swash plate which is contacted with the telescopic end of the adjusting plunger, the oil path also comprises an electromagnetic valve which is electrically connected with the pressure cut-off valve, the passage of the electromagnetic valve is connected with an oil tank, the electromagnetic valve is in a full current state, the pressure cut-off valve is in a low pressure position, hydraulic oil in the working oil pump enters a plunger cylinder of the adjusting plunger through the pressure cut-off valve so that the telescopic end of the adjusting plunger pushes the swash plate to rotate, and the flow of the hydraulic oil; the electromagnetic valve is in a low current state, the pressure cut-off valve is in a high pressure position, and hydraulic oil in the working oil pump flows back to the oil tank through the pressure cut-off valve or the electromagnetic valve.
Description
Technical Field
The invention relates to the technical field of hydraulic pressure, in particular to a hydraulic oil way and engineering machinery.
Background
At present, hydraulic transmission is generally adopted by engineering machinery, due to the characteristics of the hydraulic transmission and the relatively severe working environment and working condition of the engineering machinery, the heat generated by a system is not enough only by the surface emission of an oil tank, elements and pipe fittings, and the effective control of the hydraulic oil temperature is the basic premise of the normal work of the system, so that a cooling system consisting of a special cooling device and a corresponding cooling loop becomes an indispensable link in most engineering machinery.
The hydraulic cooling system is used as the core of the whole cooling system, a fixed displacement motor is generally adopted to drive a fan to rotate, the rotating speed of the fan is fixed under the condition that the displacement of the fixed displacement motor is fixed, and the fan always works in a cooling power state. When the heating value of the hydraulic system is not large and the environmental temperature is low, the heat dissipation energy consumption is large.
Disclosure of Invention
The invention aims to provide a hydraulic oil way and engineering machinery, which can enable the hydraulic oil way to be in a small-displacement and low-pressure state while realizing the non-work of the hydraulic oil way, thereby saving energy consumption.
The embodiment of the invention is realized by the following steps:
on one hand, the embodiment of the invention provides a hydraulic oil circuit, which comprises a working oil pump and a heat dissipation oil circuit which are communicated with each other, wherein a control valve, an air cooling motor and a fan are sequentially arranged on the heat dissipation oil circuit, the control valve is communicated, and the air cooling motor drives the fan to rotate; the hydraulic oil pump is characterized in that a pressure cut-off valve, an adjusting plunger and a swash plate which is contacted with the telescopic end of the adjusting plunger are sequentially arranged on an oil path of the working oil pump, the oil path also comprises an electromagnetic valve which is electrically connected with the pressure cut-off valve, a passage of the electromagnetic valve is connected with an oil tank, the electromagnetic valve is in a full current state, the pressure cut-off valve is in a low pressure position, hydraulic oil in the working oil pump enters a plunger cylinder of the adjusting plunger through the pressure cut-off valve so that the telescopic end of the adjusting plunger pushes the swash plate to rotate, and the flow of the hydraulic oil in the working; the solenoid valve is put low current state, the pressure trip valve is in high pressure position, hydraulic oil in the working oil pump passes through the pressure trip valve or the solenoid valve backward flow goes into the oil tank. The hydraulic oil way can realize that the hydraulic oil way does not work and simultaneously enables the hydraulic oil way to be in a small-displacement and low-pressure state, thereby saving energy consumption.
Optionally, in a preferred embodiment of the present invention, the control valve is a three-position four-way valve, two working oil ports of the control valve are respectively communicated with two working oil ports of the air-cooling motor, a conducting state of the control valve includes a left position and a right position, the control valve is in the left position, and the air-cooling motor drives the fan to rotate along a first direction; the control valve is in the right position, and the air cooling motor drives the fan to rotate along the direction opposite to the first direction.
Optionally, in a preferred embodiment of the present invention, the control valve is an electro-hydraulic proportional directional valve or an electromagnetic directional valve.
Optionally, in a preferred embodiment of the present invention, a first oil path and a second oil path are respectively disposed between the two working oil ports of the control valve and the two working oil ports of the air-cooled motor, and the heat dissipation oil path further includes two oil replenishment valves, which are respectively disposed between the first oil path and the oil tank and between the second oil path and the oil tank.
Optionally, in a preferred embodiment of the present invention, the two oil compensating valves are both check valves, oil inlets of the two check valves are respectively communicated with the oil tank, and oil outlets of the two check valves are respectively communicated with the first oil path and the second oil path.
Optionally, in a preferred embodiment of the present invention, the pressure shut-off valve is a two-position three-way valve.
Optionally, in a preferred embodiment of the invention, the pressure shut-off valve is an electro-hydraulic shut-off valve.
In another aspect of the embodiments of the present invention, an engineering machine is provided, which includes the above-mentioned hydraulic oil circuit. The hydraulic oil way can realize that the hydraulic oil way does not work and simultaneously enables the hydraulic oil way to be in a small-displacement and low-pressure state, thereby saving energy consumption.
The embodiment of the invention has the beneficial effects that:
the hydraulic oil circuit comprises a working oil pump and a heat dissipation oil circuit which are communicated with each other, a control valve, an air cooling motor and a fan are sequentially arranged on the heat dissipation oil circuit, the control valve is communicated, hydraulic oil in the working oil pump flows into the air cooling motor through the control valve, and the air cooling motor drives the fan to rotate, so that the heat dissipation function of the hydraulic oil circuit is realized; the control valve is not conducted, hydraulic oil in the working oil pump cannot flow into the air-cooled motor through the control valve, the air-cooled motor does not drive the fan to rotate any more, and the standby mode of the hydraulic oil circuit in the non-working state is realized. The oil circuit of the working oil pump is sequentially provided with a pressure cut-off valve, an adjusting plunger and a swash plate which is contacted with the telescopic end of the adjusting plunger, the oil circuit also comprises an electromagnetic valve which is electrically connected with the pressure cut-off valve, the passage of the electromagnetic valve is connected with an oil tank, the electromagnetic valve is in a full current state, the pressure cut-off valve is in a low pressure level, hydraulic oil in the working oil pump enters a plunger cylinder of the adjusting plunger through the pressure cut-off valve so that the telescopic end of the adjusting plunger pushes the swash plate to rotate, the flow of the hydraulic oil in the working oil pump is reduced, at the moment, the flow of the hydraulic oil in the working oil pump can only meet the requirement of maintaining the internal leakage of the working oil pump, and therefore the hydraulic oil circuit; the electromagnetic valve is in a low current state, the pressure cut-off valve is in a high pressure position, and hydraulic oil in the working oil pump flows back to the oil tank through the pressure cut-off valve or the electromagnetic valve.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a hydraulic oil circuit according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of a hydraulic oil circuit according to an embodiment of the present invention;
fig. 3 is a third schematic structural diagram of a hydraulic oil circuit according to an embodiment of the present invention.
Icon: 100-hydraulic oil circuit; 10-a working oil pump; 11-a pressure shut-off valve; 12-an adjusting plunger; 121-telescoping end; 122-plunger cylinder; 13-a swash plate; 14-a solenoid valve; 15-oil tank; 20-a heat dissipation oil path; 21-a control valve; 211-first oil passage; 212-a second oil path; 22-an air-cooled motor; 23-a fan; 24-oil supply valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Referring to fig. 1 to 3, the present embodiment provides a hydraulic oil circuit 100, which includes a working oil pump 10 and a heat dissipating oil circuit 20 that are communicated with each other, the heat dissipating oil circuit 20 is sequentially provided with a control valve 21, an air-cooled motor 22 and a fan 23, the control valve 21 is turned on, and the air-cooled motor 22 drives the fan 23 to rotate. The oil path of the working oil pump 10 is sequentially provided with a pressure cut-off valve 11, an adjusting plunger 12 and a swash plate 13 contacted with a telescopic end 121 of the adjusting plunger 12, the oil path also comprises an electromagnetic valve 14 electrically connected with the pressure cut-off valve 11, the passage of the electromagnetic valve 14 is connected with an oil tank 15, the electromagnetic valve 14 is in a full current state, the pressure cut-off valve 11 is in a low pressure position, hydraulic oil in the working oil pump 10 enters a plunger cylinder 122 of the adjusting plunger 12 through the pressure cut-off valve 11, so that the telescopic end 121 of the adjusting plunger 12 pushes the swash plate 13 to rotate, and the flow of the hydraulic oil in the working oil; the electromagnetic valve 14 is set to a low current state, the pressure cut-off valve 11 is at a high pressure level, and the hydraulic oil in the working oil pump 10 flows back to the oil tank 15 through the pressure cut-off valve 11 or the electromagnetic valve 14. Wherein, the pressure cut-off valve 11 can be a two-position three-way valve. Alternatively, the pressure cutoff valve 11 may be an electro-hydraulic cutoff valve. The hydraulic oil circuit 100 can enable the hydraulic oil circuit 100 to be in a low-displacement and low-pressure state while the hydraulic oil circuit 100 does not work, and therefore energy consumption is saved.
First, the control valve 21 includes a conducting state and a non-conducting state, when the control valve 21 is in the conducting state, the hydraulic oil in the working oil pump 10 flows into the air-cooled motor 22 through the control valve 21, and the air-cooled motor 22 drives the fan 23 to rotate, so as to implement the heat dissipation function of the hydraulic oil path 100; when the control valve 21 is in the non-conduction state, the hydraulic oil in the working oil pump 10 cannot flow into the air-cooled motor 22 through the control valve 21, and the air-cooled motor 22 no longer drives the fan 23 to rotate, so that the non-working state standby mode of the hydraulic oil circuit 100 is realized.
Secondly, when the control valve 21 is in a non-conducting state, the working oil pump 10 is in a pressure cut-off state, and simultaneously when the external controller control electromagnetic valve 14 is in a full current state, the pressure cut-off valve 11 is in a low pressure level, hydraulic oil in the working oil pump 10 enters the plunger cylinder 122 of the adjusting plunger 12 through the pressure cut-off valve 11, so that the telescopic end 121 of the adjusting plunger 12 pushes the swash plate 13 to rotate, thereby reducing the flow rate of the hydraulic oil in the working oil pump 10, at this time, the flow rate of the hydraulic oil in the working oil pump 10 can only meet the requirement of maintaining the internal leakage of the working oil pump 10, thereby enabling the hydraulic oil circuit 100 to be in a small displacement and low pressure state while the hydraulic oil circuit 100 does not work.
As described above, the hydraulic oil path 100 includes the working oil pump 10 and the heat dissipation oil path 20 that are communicated with each other, the heat dissipation oil path 20 is sequentially provided with the control valve 21, the air-cooled motor 22 and the fan 23, the control valve 21 is conducted, the hydraulic oil in the working oil pump 10 flows into the air-cooled motor 22 through the control valve 21, and the air-cooled motor 22 drives the fan 23 to rotate, so as to realize the heat dissipation function of the hydraulic oil path 100; the control valve 21 is not opened, the hydraulic oil in the hydraulic oil pump 10 cannot flow into the air-cooled motor 22 through the control valve 21, and the air-cooled motor 22 no longer drives the fan 23 to rotate, thereby realizing the standby mode of the non-operating state of the hydraulic oil path 100. The oil path of the working oil pump 10 is sequentially provided with a pressure cut-off valve 11, an adjusting plunger 12 and a swash plate 13 contacted with a telescopic end 121 of the adjusting plunger 12, the oil path also comprises an electromagnetic valve 14 electrically connected with the pressure cut-off valve 11, a passage of the electromagnetic valve 14 is connected with an oil tank 15, the electromagnetic valve 14 is in a full current state, the pressure cut-off valve 11 is in a low pressure level, hydraulic oil in the working oil pump 10 enters a plunger cylinder 122 of the adjusting plunger 12 through the pressure cut-off valve 11, so that the telescopic end 121 of the adjusting plunger 12 pushes the swash plate 13 to rotate, the flow of the hydraulic oil in the working oil pump 10 is reduced, at the moment, the flow of the hydraulic oil in the working oil pump 10 can only meet the requirement of maintaining the internal leakage of the working oil pump 10, and therefore the hydraulic oil path 100 can be in a; the electromagnetic valve 14 is set to a low current state, the pressure cut-off valve 11 is at a high pressure level, and the hydraulic oil in the working oil pump 10 flows back to the oil tank 15 through the pressure cut-off valve 11 or the electromagnetic valve 14.
Because the working environment of engineering machinery products is poor, and the dust is many for hydraulic cooling system adsorbs dust or tiny debris granule easily, and the dust and the tiny granule in the hydraulic cooling system can influence the radiating efficiency of system, consequently, need regularly carry out the deashing to hydraulic cooling system. In the prior art, the ash removal of a hydraulic cooling system is usually performed manually on a hydraulic independent cooling system of a product under the condition that an engineering machinery product stops running, however, the ash removal process not only affects the work of the cooling system, but also wastes manpower, and the ash removal efficiency is low.
In this embodiment, the control valve 21 is a three-position four-way valve, two working oil ports of the control valve 21 are respectively communicated with two working oil ports of the air-cooling motor 22, the conducting state of the control valve 21 includes a left position and a right position, the control valve 21 is in the left position, and the air-cooling motor 22 drives the fan 23 to rotate along a first direction; the control valve 21 is in the right position and the air-cooled motor 22 drives the fan 23 to rotate in a direction opposite to the first direction, so that the fan 23 has two distinct rotational states. In the present embodiment, it is set that when the control valve 21 is in the left position and the fan 23 rotates in the first direction, the fan 23 rotates forward and is in the heat dissipation state, and when the control valve 21 is in the right position and the fan 23 rotates in the direction opposite to the first direction, the fan 23 rotates backward and the fan 23 is in the dust removal state. Of course, in other embodiments, if the connection relationship between the two working ports of the control valve 21 and the two working ports of the air-cooled motor 22 is exchanged, the fan 23 is in the ash cleaning state when the control valve 21 is in the left position, and the fan 23 is in the heat radiation state when the control valve 21 is in the right position.
The control valve 21 may be an electro-hydraulic proportional directional valve or an electromagnetic directional valve, or may be an electromagnetic valve group composed of a plurality of electromagnetic valves. When the control valve 21 is an electro-hydraulic proportional directional valve, the flow rate of the hydraulic oil flowing into the air-cooled motor 22 through the control valve 21 can be controlled accurately, so that the speed regulation range of the air-cooled motor 22 is enlarged, and the control of the hydraulic oil circuit 100 on the heat dissipation temperature is more accurate.
To sum up, the hydraulic oil circuit 100 can be divided into a heat dissipation standby state, a heat dissipation state of the fan 23, and a dust cleaning state of the fan 23, and the control strategies of the three states are as follows:
(1) standby state of heat dissipation
As shown in fig. 1, both the two electro-proportional electromagnets of the control valve 21 are in a power-off state, the control valve 21 is in a neutral state (i.e., the control valve 21 is not conducted), the electromagnetic valve 14 is in a full-current state, the pressure cutoff valve 11 is in a low-pressure position (i.e., a minimum state), and after the output pressure of the working oil pump 10 reaches a minimum pressure cutoff value, the flow rate of the hydraulic oil in the working oil pump 10 is reduced to a level that only the operation leakage of the working oil pump 10 can be maintained.
(2) Heat radiation state of fan 23
As shown in fig. 2, the electro-proportional electromagnet on the left side of the control valve 21 is in an energized state, the control valve 21 is turned on and is in a left position, the electromagnetic valve 14 can set pressure according to the rotation speed required by the fan 23, the working oil pump 10 is in a normal working state, the fan 23 rotates forward, the flow entering the air-cooled motor 22 depends on the opening degree of the control valve 21 and the set pressure of the working oil pump 10, the hydraulic oil circuit 100 can reasonably adjust the current of the control valve 21 or the control current of the working oil pump 10 according to the actual heat dissipation requirement to adjust the flow flowing into the air-cooled motor 22, so as to realize different rotation speeds and pressures of the air-cooled motor 22, and the whole hydraulic oil circuit 100 operates in a constant-pressure and constant-current state without adjusting the currents of the two.
(3) Ash removal state of fan 23
As shown in fig. 3, the electro-proportional solenoid on the right side of the control valve 21 is in an energized state, the control valve 21 is turned on and is in the right position, the solenoid valve 14 can set the pressure according to the rotation speed required by the fan 23, the working oil pump 10 is in a normal working state, the fan 23 rotates reversely, and the fan 23 is in a dust cleaning state.
It should be noted that, when any one of the electric proportional electromagnets of the control valve 21 is powered on, the hydraulic oil path 100 is in a conducting state, and the two electric proportional electromagnets make the opening of the control valve 21 continuously change under different currents, so as to realize the rotation of the air-cooled motor 22 at different rotation speeds.
In this embodiment, a first oil path 211 and a second oil path 212 are respectively disposed between the two working oil ports of the control valve 21 and the two working oil ports of the air-cooled motor 22, the heat dissipation oil path 20 further includes two oil replenishment valves 24, and the two oil replenishment valves 24 are respectively disposed between the first oil path 211 and the oil tank 15 and between the second oil path 212 and the oil tank 15.
Specifically, in the present embodiment, the two oil compensating valves 24 are both check valves, oil inlets of the two check valves are respectively communicated with the oil tank 15, and oil outlets of the two check valves are respectively communicated with the first oil path 211 and the second oil path 212.
It should be noted that the oil supply valve 24 is used when the operating oil pump 10 stops supplying oil or the control valve 21 is cut off from the left position or the right position to the middle position, the oil inlet of the air-cooled motor 22 is not supplied with flow, but the fan 23 is still in the state of supplying oil which should be rotated by inertia, so as to avoid the damage of the air-cooled motor 22 caused by idle rotation of the oil inlet due to no flow.
The application also provides an engineering machine. The construction machine according to the present embodiment includes the hydraulic oil passage 100 described above. Since the structure and the advantageous effects of the hydraulic oil circuit 100 have been described in detail in the foregoing embodiments, no further description is provided herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A hydraulic oil circuit is characterized by comprising a working oil pump and a heat dissipation oil circuit which are communicated with each other, wherein a control valve, an air cooling motor and a fan are sequentially arranged on the heat dissipation oil circuit, the control valve is communicated, and the air cooling motor drives the fan to rotate;
the hydraulic oil pump is characterized in that a pressure cut-off valve, an adjusting plunger and a swash plate which is contacted with the telescopic end of the adjusting plunger are sequentially arranged on an oil path of the working oil pump, the oil path also comprises an electromagnetic valve which is electrically connected with the pressure cut-off valve, a passage of the electromagnetic valve is connected with an oil tank, the electromagnetic valve is in a full current state, the pressure cut-off valve is in a low pressure position, hydraulic oil in the working oil pump enters a plunger cylinder of the adjusting plunger through the pressure cut-off valve so that the telescopic end of the adjusting plunger pushes the swash plate to rotate, and the flow of the hydraulic oil in the working; the solenoid valve is put low current state, the pressure trip valve is in high pressure position, hydraulic oil in the working oil pump passes through the pressure trip valve or the solenoid valve backward flow goes into the oil tank.
2. The hydraulic circuit of claim 1, wherein the control valve is a three-position four-way valve, two working oil ports of the control valve are respectively communicated with two working oil ports of the air-cooled motor, the conducting state of the control valve comprises a left position and a right position, the control valve is in the left position, and the air-cooled motor drives the fan to rotate along a first direction; the control valve is in the right position, and the air cooling motor drives the fan to rotate along the direction opposite to the first direction.
3. The hydraulic circuit of claim 1, wherein the control valve is an electro-hydraulic proportional directional valve or an electromagnetic directional valve.
4. The hydraulic circuit according to claim 1, wherein a first circuit and a second circuit are respectively disposed between the two working ports of the control valve and the two working ports of the air-cooled motor, and the cooling circuit further includes two oil supply valves respectively disposed between the first circuit and the oil tank and between the second circuit and the oil tank.
5. The hydraulic oil circuit according to claim 4, wherein both of the two oil replenishment valves are one-way valves, oil inlets of both of the two one-way valves are respectively communicated with the oil tank, and oil outlets of both of the two one-way valves are respectively communicated with the first oil circuit and the second oil circuit.
6. The hydraulic circuit of claim 1, wherein the pressure shut-off valve is a two-position three-way valve.
7. The hydraulic circuit of claim 1, wherein the pressure cutoff valve is an electro-hydraulic cutoff valve.
8. A working machine, characterized by comprising a hydraulic circuit according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010036368.9A CN111188810A (en) | 2020-01-14 | 2020-01-14 | Hydraulic oil circuit and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010036368.9A CN111188810A (en) | 2020-01-14 | 2020-01-14 | Hydraulic oil circuit and engineering machinery |
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| CN111188810A true CN111188810A (en) | 2020-05-22 |
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| CN202010036368.9A Pending CN111188810A (en) | 2020-01-14 | 2020-01-14 | Hydraulic oil circuit and engineering machinery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847297A (en) * | 2021-10-19 | 2021-12-28 | 徐工消防安全装备有限公司 | Electric load sensing system and control method thereof |
| CN114396096A (en) * | 2022-01-27 | 2022-04-26 | 徐州徐工挖掘机械有限公司 | Heat dissipation hydraulic system and excavator |
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| CN114396096A (en) * | 2022-01-27 | 2022-04-26 | 徐州徐工挖掘机械有限公司 | Heat dissipation hydraulic system and excavator |
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Application publication date: 20200522 |