CN219413119U - Independent heat dissipation hydraulic system and excavator - Google Patents
Independent heat dissipation hydraulic system and excavator Download PDFInfo
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- CN219413119U CN219413119U CN202320094668.1U CN202320094668U CN219413119U CN 219413119 U CN219413119 U CN 219413119U CN 202320094668 U CN202320094668 U CN 202320094668U CN 219413119 U CN219413119 U CN 219413119U
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Abstract
The utility model discloses an independent heat dissipation hydraulic system and an excavator in the technical field of direction control of an excavator hydraulic system, and aims to solve the problem that a heat dissipation fan in the prior art can perform stationary reversing for a long time under the action of inertia to perform cleaning operation; when the fan is in the middle working position, the fan can be quickly changed from a motion state to a static state due to the existence of the middle oil return throttle; when the device is in the right working position, the fan is driven by the fan motor to rotate reversely, so that cleaning and dust removal work is performed. According to the utility model, the switching of the heat dissipation of the fan and the cleaning and dedusting work can be completed under the condition that the engine of the excavator is not closed, so that the excavator can continuously work, and the working efficiency of the excavator is improved.
Description
Technical Field
The utility model relates to an independent heat dissipation hydraulic system and an excavator, and belongs to the technical field of direction control of hydraulic systems of the excavator.
Background
With the continuous improvement of excavator technology, more and more independent heat dissipation systems of the excavator adopt a reversible fan driven by hydraulic pressure. Because the fan rotates forward to dissipate heat for a period of time, dust is accumulated on the surfaces of the fan blades, so that the heat dissipation performance is affected, and the fan needs to rotate reversely to remove the dust.
The existing measure is that an electric control variable pump is generally adopted to drive a bidirectional hydraulic motor, and the reversing function is realized through an electromagnetic reversing valve; under the hydraulic control system, the radiator fan is changed forward, the fan blades can be static for a long time under the inertia effect, and then can be rotated in a reversing way to perform self-cleaning operation. During the period of waiting for the fan blades to stop completely, the excavator is in a stop waiting state and cannot enter normal operation quickly, so that the working efficiency of the excavator is reduced.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art, and provides an independent heat dissipation hydraulic system and an excavator, which can realize the rapid stopping of a fan motor to finish reversing dust removal work on the premise of not closing an engine of the excavator, so that the excavator can quickly enter a working state, and the working efficiency of the excavator is improved.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
in one aspect, the utility model provides an independent heat dissipation hydraulic system, which comprises a heat dissipation pump, a pilot pump, a reversing valve block, a fan motor, a fan and an oil tank, wherein the fan is in driving connection with the fan motor, the reversing valve block comprises a hydraulic control reversing valve, and the hydraulic control reversing valve is provided with a left working position, a middle working position and a right working position;
the oil tank sequentially supplies oil to the fan motor through the electromagnetic reversing valve, the electromagnetic valve and the hydraulic control reversing valve;
when the electromagnetic valve and the electromagnetic reversing valve are powered off, the hydraulic reversing valve is in a left working position, the oil tank supplies oil to the fan motor through the heat dissipation pump and the hydraulic reversing valve under the pressure of the pilot pump, and the fan is driven by the fan motor to rotate positively;
when the electromagnetic valve is powered on and the electromagnetic reversing valve is powered off, the pressure of the pilot pump is cut off, the hydraulic reversing valve is in a middle working position, oil of the fan motor flows back to the oil tank after passing through the hydraulic reversing valve, the fan continuously rotates positively under the action of inertial force, the middle position of the hydraulic reversing valve returns oil to be throttled, and the fan can realize rapid transition from a moving state to a static state;
after the fan stops, when the electromagnetic valve is powered off and the electromagnetic directional valve is powered on, the hydraulic control directional valve is in a right working position, under the pressure of the pilot pump, the heat dissipation pump supplies oil to the heat dissipation motor through the hydraulic control directional valve, and the fan is reversely rotated under the driving of the fan motor.
Optionally, the heat dissipation pump is provided with a first heat dissipation pump oil port connected with the oil tank and a second heat dissipation pump oil port connected with the reversing valve block;
the pilot pump is provided with a first pilot pump oil port connected with the oil tank and a second pilot pump oil port connected with the electromagnetic directional valve; the electromagnetic valve is provided with a first electromagnetic oil port connected with the pilot pump, a second electromagnetic oil port connected with the oil tank and a third electromagnetic oil port connected with the electromagnetic reversing valve; the electromagnetic reversing valve is provided with a first electromagnetic reversing oil port connected with the electromagnetic valve, a second electromagnetic reversing oil port connected with the oil tank, a third electromagnetic reversing oil port connected with the reversing valve block and a fourth electromagnetic reversing oil port;
the fan motor is provided with a first working oil port and a second working oil port which are connected with the reversing valve block, and the reversing valve block is provided with an oil inlet which is connected with the oil port of the second heat dissipation pump, an oil return port which is connected with the oil tank, a first control oil port and a second control oil port which are connected with the third electromagnetic reversing oil port, a third control oil port which is connected with the first working oil port and a fourth control oil port which is connected with the second working oil port.
Optionally, the reversing valve block further includes a plurality of anti-reversing valves, where the anti-reversing valves include a first anti-reversing valve and a second anti-reversing valve, the first anti-reversing valve is provided with a first anti-reversing oil port and a second anti-reversing oil port, the first anti-reversing oil port is connected with the fourth control oil port, and the second anti-reversing oil port is connected with the third control oil port;
the second reverse-rotation prevention valve is provided with a third reverse-rotation prevention oil port and a fourth reverse-rotation prevention oil port, the third reverse-rotation prevention oil port is connected with the third control oil port, and the fourth reverse-rotation prevention oil port is connected with the fourth control oil port.
Optionally, the reversing valve block further includes a plurality of check valves, the check valves include a first check valve and a second check valve, the first check valve is provided with a first check oil port and a second check oil port, the first check oil port is connected with the fourth control oil port, and the second check oil port is connected with the oil return port;
the second one-way valve is provided with a third one-way oil port and a fourth one-way oil port, the third one-way oil port is connected with the third control oil port, and the third one-way oil port is connected with the oil return port.
Optionally, the reversing valve block further includes a plurality of overflow valves, the overflow valves include a first overflow valve and a second overflow valve, the first overflow valve is provided with a first overflow oil port and a second overflow oil port, the first overflow oil port is connected with the oil return port, and the second overflow oil port is connected with the third control oil port;
the second overflow valve is provided with a third overflow oil port and a fourth overflow oil port, the third overflow oil port is connected with the oil return port, and the fourth overflow oil port is connected with the fourth control oil port.
Optionally, the hydraulic system further comprises a heat dissipation pump overflow valve and a pilot pump overflow valve, wherein the heat dissipation pump overflow valve is provided with a first heat dissipation pump overflow oil port connected with a second heat dissipation pump oil port, and a second heat dissipation pump overflow oil port connected with the oil tank; the pilot pump overflow valve is provided with a first pilot pump overflow oil port connected with a second pilot pump oil port, and a second heat dissipation pump overflow oil port connected with the oil tank.
On the other hand, the utility model also provides an excavator, which comprises the independent heat dissipation hydraulic system.
Compared with the prior art, the utility model has the beneficial effects that:
according to the hydraulic heat dissipation system provided by the utility model, the power-on states of the electromagnetic directional valve and the electromagnetic directional valve are controlled to respectively adjust the oil way flow direction of the hydraulic directional valve in three working positions, and the fan can be quickly converted into a static state from a forward rotation state and then into a reverse rotation state due to the existence of oil return throttling of the middle working position of the hydraulic directional valve, so that dust removal work is carried out, and the working efficiency is effectively improved;
the reversing valve block is also provided with the anti-reversing valve, the one-way valve and the overflow valve, the anti-reversing valve can prevent the fan from reversely rotating due to pressure holding, the one-way valve enables the oil way to flow in one direction, the overflow valve can prevent the oil port from being excessively high in pressure, various unexpected situations are effectively avoided through cooperation, and the stability of the heat dissipation hydraulic system is improved.
Drawings
FIG. 1 is a schematic diagram of an independent heat dissipating hydraulic system according to an embodiment of the present utility model;
in the figure: the hydraulic control system comprises a 1-dispersion heat pump, a 2-pilot pump, a 3-electromagnetic directional valve, a 4-directional valve block, a 41-hydraulic control directional valve, a 421 first anti-reverse valve, a 422 second anti-reverse valve, a 431 first one-way valve, a 432 second one-way valve, a 441 overflow valve, a 442 second overflow valve, a 5-fan motor, a 6-main pump overflow valve, a 7-electromagnetic valve, an 8-fan, a 9-pilot pump overflow valve, a 10 oil tank, a T oil return port, a P oil inlet, a X1 first control oil port, a X2 second control oil port, an A third control oil port and a B fourth control oil port.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model 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 utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, 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 utility model can be understood by those of ordinary skill in the art in a specific case.
Example 1:
as shown in fig. 1, the independent heat dissipation hydraulic system provided by the embodiment of the utility model comprises a heat dissipation pump 1, a pilot pump 2, a reversing valve block 4, a fan motor 5, a fan 8, an oil tank 10 and the like, wherein the fan 8 and the fan motor 5 are in driving connection, the fan motor 5 is provided with a first working oil port and a second working oil port which are connected with the reversing valve block 4, and the reversing valve block 4 is provided with a third control oil port A connected with the first working oil port and a fourth control oil port B connected with the second working oil port.
The heat dissipation pump 1 is provided with a first heat dissipation pump oil port connected with the oil tank 10 and a second heat dissipation pump oil port connected with the reversing valve block 4, the pilot pump 2 is provided with a first pilot pump oil port connected with the oil tank 10 and a second pilot pump oil port connected with the electromagnetic valve 7, the electromagnetic valve 7 is provided with a first electromagnetic oil port connected with the pilot pump 2, a second electromagnetic oil port connected with the oil tank 10 and a third electromagnetic oil port connected with the electromagnetic reversing valve 3, and the electromagnetic reversing valve 3 is provided with a first electromagnetic reversing oil port connected with the electromagnetic valve 7, a second electromagnetic reversing oil port connected with the oil tank 10, a third electromagnetic reversing oil port connected with the reversing valve block 4 and a fourth electromagnetic reversing oil port.
The reversing valve block 4 is further provided with an oil inlet P connected with the oil port of the second heat dissipation pump, an oil return port T connected with the oil tank 10, and a first control oil port X1 and a second control oil port X2 connected with the third electromagnetic reversing oil port, the reversing valve block 4 comprises a hydraulic reversing valve 41, and the hydraulic reversing valve 41 is connected with the oil inlet P, the oil return port T, the first control oil port X1, the second control oil port X2, the third control oil port A and the fourth control oil port B, and is provided with a left working position, a middle working position and a right working position.
The hydraulic system further comprises a heat dissipation pump overflow valve 6 and a pilot pump overflow valve 9, wherein the heat dissipation pump overflow valve 6 is provided with a first heat dissipation pump overflow oil port connected with a second heat dissipation pump oil port, and the second heat dissipation pump overflow oil port is connected with an oil tank 10; the pilot pump relief valve 9 is provided with a first pilot pump relief port connected to a second pilot pump port, and a second heat-dissipating pump relief port connected to the oil tank 10.
Example 2:
on the basis of embodiment 1, the reversing valve block of this embodiment further includes anti-reversing valves, check valves and overflow valves, the number of which is 2, each anti-reversing valve includes a first anti-reversing valve 421 and a second anti-reversing valve 422, the first anti-reversing valve 421 is provided with a first anti-reversing oil port and a second anti-reversing oil port, the first anti-reversing oil port is connected with the fourth control oil port B, and the second anti-reversing oil port is connected with the third control oil port a. The second anti-reverse valve 422 is provided with a third anti-reverse oil port and a fourth anti-reverse oil port, the third anti-reverse oil port is connected with the third control oil port A, and the fourth anti-reverse oil port is connected with the fourth control oil port B.
The check valve comprises a first check valve 431 and a second check valve 432, the first check valve 431 is provided with a first check oil port and a second check oil port, the first check oil port is connected with the fourth control oil port B, and the second check oil port is connected with the oil return port T. The second check valve 432 is provided with a third one-way oil port and a fourth one-way oil port, the third one-way oil port is connected with the third control oil port A, and the third one-way oil port is connected with the oil return port T. The check valve can prevent the fan motor from sucking the air when the oil supply is insufficient.
The overflow valve comprises a first overflow valve 441 and a second overflow valve 442, the first overflow valve 441 is provided with a first overflow oil port and a second overflow oil port, the first overflow oil port is connected with an oil return port T, and the second overflow oil port is connected with a third control oil port A. The second overflow valve 442 is provided with a third overflow port and a fourth overflow port, the third overflow port is connected with the oil return port T, and the fourth overflow port is connected with the fourth control port B.
When the electromagnetic valve 7 is powered, the pilot operated directional valve 41 is in the neutral position, and the fan motor 5 is rapidly changed from the moving state to the stationary state, during which the pressure of the third control port a is increased due to the inertia of the fan 8, and when the pressure is greater than the pressure set by the first relief valve, the relief valve starts to relief. The valve core moves downwards under the action of the pilot oil path of the anti-reverse valve 422, the oil paths of the third control oil port A and the fourth control oil port B are communicated, and the pressure of the third control oil port A is rapidly released, so that reverse rotation of the fan 8 due to pressure holding is prevented.
Example 3:
the embodiment provides an excavator, which comprises the independent heat dissipation hydraulic system.
The working principle of the utility model is as follows: after the excavator is started, the electromagnetic valve 7 and the electromagnetic directional valve 3 are in a power-off state, at the moment, the hydraulic directional valve 41 is in a left working position under the pressure of the pilot pump 2, the heat dissipation pump 1 supplies oil to the first working oil port of the fan motor 5 through the hydraulic directional valve 41, and the fan is driven by the fan motor 5 to rotate positively and is in a heat dissipation state at the moment.
When the dust removing operation is needed, the electromagnetic valve 7 is powered on, at the moment, the pilot pressure is cut off, the hydraulic control reversing valve 41 returns to the middle working position under the spring force, the pressure oil of the fan motor 5 is cut off, the fan motor 5 continues to rotate under the inertia effect, the pressure oil of the fan motor 5 returns to the oil tank 10 through the first working oil port and the third control oil port A, the pressure of the third control oil port A rises due to the existence of the oil return throttling of the working position in the hydraulic control reversing valve 41, and meanwhile, the fourth control oil port B of the fan motor 5 supplements oil from the first working oil port of the fan motor 5 through the working position oil return channel in the hydraulic control reversing valve 41 on one hand, and the second one-way valve 432 supplements oil from the oil tank 10 on the other hand.
At this time, the fan motor 5 may be reversed, and the anti-reversing valve may be opened, so that the oil paths on two sides of the fan motor 5 are conducted, and the pipeline pressure is rapidly released, so as to prevent the fan motor 5 from reversing.
Through experimental tests, the time required by the fan motor 5 from moving to being stationary under different rotating speeds can be recorded as t, after t+Δt time, the electromagnetic valve 7 is powered off, the electromagnetic directional valve 3 is powered on, the hydraulic directional valve 41 is in a right working position under the pilot pressure, the oil tank 10 supplies oil to a second working oil port of the fan motor 5 through the heat dissipation pump 1 and the hydraulic directional valve 41, and the fan is reversely rotated under the driving of the fan motor 5 and is in a dust removal state at the moment.
After the dust removing operation is completed, the electromagnetic valve 7 is powered on, the pilot pressure is cut off, the hydraulic control reversing valve 41 returns to the middle working position, the pressure oil of the fan motor 5 is cut off, the fan motor 5 stops rotating after t time, the electromagnetic valve 7 and the electromagnetic reversing valve 3 are powered off after t+Δt time, the hydraulic control reversing valve 41 is in the left working position, and the fan motor 5 is driven by the main oil pressure to rotate forward again to perform the heat radiating operation.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present utility model, and such modifications and variations should also be regarded as being within the scope of the utility model.
Claims (7)
1. An independent heat dissipation hydraulic system, characterized in that: the hydraulic control system comprises a heat dissipation pump (1), a pilot pump (2), a reversing valve block (4), a fan motor (5), a fan (8) and an oil tank (10), wherein the fan (8) is in driving connection with the fan motor (5), the reversing valve block (4) comprises a hydraulic control reversing valve (41), and the hydraulic control reversing valve (41) is provided with a left working position, a middle working position and a right working position;
the cooling pump (1) supplies oil to the fan motor (5) through the electromagnetic directional valve (3) and a hydraulic control directional valve (41) controlled by the electromagnetic valve (7);
when the electromagnetic valve (7) and the electromagnetic directional valve (3) are not powered, the hydraulic directional valve (41) is in a left working position, the heat dissipation pump (1) supplies oil to the fan motor (5) through the hydraulic directional valve (41) under the pressure of the pilot pump (2), and the fan (8) rotates positively under the drive of the fan motor (5);
when the electromagnetic valve (7) is powered on and the electromagnetic directional valve (3) is powered off, the pressure of the pilot pump (2) is cut off, the hydraulic directional valve (41) is in a middle working position, oil of the fan motor (5) flows back to the oil tank (10) after passing through the hydraulic directional valve (41), the fan (8) continuously rotates positively under the action of inertial force, the middle position of the hydraulic directional valve (41) returns oil to be throttled, and the fan (8) can realize rapid transition from a moving state to a static state;
when the electromagnetic valve (7) is powered off and the electromagnetic directional valve (3) is powered on, the hydraulic directional valve (41) is in a right working position, the heat dissipation pump (1) supplies oil through the hydraulic directional valve (41) under the pressure of the pilot pump (2), and the fan (8) is reversely rotated under the driving of the fan motor (5).
2. An independent heat dissipating hydraulic system of claim 1, wherein: the heat dissipation pump (1) is provided with a first heat dissipation pump oil port connected with the oil tank (10) and a second heat dissipation pump oil port connected with the reversing valve block (4);
the pilot pump (2) is provided with a first pilot pump oil port connected with the oil tank (10) and a second pilot pump oil port connected with the electromagnetic valve (7), the electromagnetic valve (7) is provided with a first electromagnetic oil port connected with the pilot pump (2), a second electromagnetic oil port connected with the oil tank (10) and a third electromagnetic oil port connected with the electromagnetic directional valve (3), and the electromagnetic directional valve (3) is provided with a first electromagnetic directional oil port connected with the electromagnetic valve (7), a second electromagnetic directional oil port connected with the oil tank (10), a third electromagnetic directional oil port connected with the directional valve block (4) and a fourth electromagnetic directional oil port;
the reversing valve block (4) is provided with an oil inlet (P) connected with the oil port of the second heat dissipation pump, an oil return port (T) connected with the oil tank (10), a first control oil port (X1) and a second control oil port (X2) connected with the third electromagnetic reversing oil port, a third control oil port (A) connected with the first working oil port and a fourth control oil port (B) connected with the second working oil port;
the fan motor (5) is provided with a first working oil port and a second working oil port which are connected with the reversing valve block (4).
3. An independent heat dissipating hydraulic system of claim 2, wherein: the reversing valve block (4) further comprises a plurality of anti-reversing valves, the anti-reversing valves comprise a first anti-reversing valve (421) and a second anti-reversing valve (422), the first anti-reversing valve (421) is provided with a first anti-reversing oil port and a second anti-reversing oil port, the first anti-reversing oil port is connected with the fourth control oil port (B), and the second anti-reversing oil port is connected with the third control oil port (A);
the second anti-reversion valve (422) is provided with a third anti-reversion oil port and a fourth anti-reversion oil port, the third anti-reversion oil port is connected with a third control oil port (A), and the fourth anti-reversion oil port is connected with a fourth control oil port (B).
4. An independent heat dissipating hydraulic system of claim 2, wherein: the reversing valve block (4) further comprises a plurality of one-way valves, the one-way valves comprise a first one-way valve (431) and a second one-way valve (432), the first one-way valve (431) is provided with a first one-way oil port and a second one-way oil port, the first one-way oil port is connected with the fourth control oil port (B), and the second one-way oil port is connected with the oil return port (T);
the second check valve (432) is provided with a third one-way oil port and a fourth one-way oil port, the third one-way oil port is connected with the third control oil port (A), and the third one-way oil port is connected with the oil return port (T).
5. An independent heat dissipating hydraulic system of claim 2, wherein: the reversing valve block (4) further comprises a plurality of overflow valves, the overflow valves comprise a first overflow valve (441) and a second overflow valve (442), the first overflow valve (441) is provided with a first overflow oil port and a second overflow oil port, the first overflow oil port is connected with the oil return port (T), and the second overflow oil port is connected with the third control oil port (A);
the second overflow valve (442) is provided with a third overflow oil port and a fourth overflow oil port, the third overflow oil port is connected with the oil return port (T), and the fourth overflow oil port is connected with the fourth control oil port (B).
6. An independent heat dissipating hydraulic system of claim 2, wherein: the heat dissipation pump overflow valve (6) is provided with a first heat dissipation pump overflow oil port connected with a second heat dissipation pump oil port, and a second heat dissipation pump overflow oil port connected with the oil tank (10); the pilot pump overflow valve (9) is provided with a first pilot pump overflow oil port connected with a second pilot pump oil port, and a second heat dissipation pump overflow oil port connected with the oil tank (10).
7. An excavator, characterized in that: an independent heat dissipating hydraulic system comprising the system of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320094668.1U CN219413119U (en) | 2023-02-01 | 2023-02-01 | Independent heat dissipation hydraulic system and excavator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320094668.1U CN219413119U (en) | 2023-02-01 | 2023-02-01 | Independent heat dissipation hydraulic system and excavator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219413119U true CN219413119U (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320094668.1U Active CN219413119U (en) | 2023-02-01 | 2023-02-01 | Independent heat dissipation hydraulic system and excavator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219413119U (en) |
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2023
- 2023-02-01 CN CN202320094668.1U patent/CN219413119U/en active Active
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