CN211366734U - Variable pump hydraulic control system and crane - Google Patents
Variable pump hydraulic control system and crane Download PDFInfo
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- CN211366734U CN211366734U CN201922020143.XU CN201922020143U CN211366734U CN 211366734 U CN211366734 U CN 211366734U CN 201922020143 U CN201922020143 U CN 201922020143U CN 211366734 U CN211366734 U CN 211366734U
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Abstract
The utility model relates to a variable pump hydraulic control system and hoist for alleviate the problem that the discharge capacity of variable pump receives the undulant influence of load. Wherein, variable pump hydraulic control system includes: a variable displacement pump; the variable mechanism is connected with the variable pump and is configured to control the displacement of the variable pump; a source of regulated oil; the input end of the valve assembly is respectively connected with the output end of the variable pump and the pressure stabilizing oil source, and the output end of the valve assembly is connected with the variable mechanism; the valve assembly is configured to lead hydraulic oil at the output end of the variable pump to the variable mechanism under a first working condition, and the displacement of the variable pump is controlled through the variable mechanism; the valve assembly is configured to guide hydraulic oil provided by the stable pressure oil source to the variable displacement mechanism under a second working condition, and the displacement of the variable displacement pump is controlled through the variable displacement mechanism. The utility model discloses a discharge capacity of steady voltage oil supply regulating variable pump reduces the influence of the fluctuation of load to the discharge capacity of variable pump.
Description
Technical Field
The utility model relates to a hydraulic pressure field especially relates to a variable pump hydraulic control system and hoist.
Background
The crane is an important device widely applied in engineering construction, mainly comprises basic actions such as lifting, stretching, amplitude changing, rotation and the like, and is driven by a hydraulic system, and the variable displacement pump is widely applied to the crane along with the increase of the working pressure grade of the hydraulic system and the higher and higher requirement on the energy saving performance of the crane. Along with the development of crane technology and the improvement of market demand, the requirement of accurate hoist and mount to speed stability is also higher and higher, and this needs variable pump flow stability very high, reduces the influence of load fluctuation to variable pump discharge capacity.
SUMMERY OF THE UTILITY MODEL
Some embodiments of the utility model provide a variable pump hydraulic control system and hoist for alleviate the problem that the discharge capacity of variable pump receives the undulant influence of load.
Some embodiments of the utility model provide a variable pump hydraulic control system, it includes:
a variable displacement pump;
the variable mechanism is connected with the variable pump and is configured to control the displacement of the variable pump;
a source of regulated oil; and
the input end of the valve assembly is respectively connected with the output end of the variable pump and the pressure stabilizing oil source, and the output end of the valve assembly is connected with the variable mechanism;
the valve assembly is configured to lead hydraulic oil at the output end of the variable pump to the variable mechanism under a first working condition, and the displacement of the variable pump is controlled through the variable mechanism;
the valve assembly is configured to guide hydraulic oil provided by the stable pressure oil source to the variable displacement mechanism under a second working condition, and the displacement of the variable displacement pump is controlled through the variable displacement mechanism.
In some embodiments, in the second operating condition, the pressure of the hydraulic oil provided by the steady-pressure oil source is greater than the pressure of the hydraulic oil provided by the output end of the variable displacement pump.
In some embodiments, the valve assembly includes a shuttle valve, a first inlet of the shuttle valve is connected to the output of the variable displacement pump, a second inlet of the shuttle valve is connected to the source of regulated oil, and an outlet of the shuttle valve is connected to the variable mechanism.
In some embodiments, the valve assembly further comprises a reversing valve disposed on an oil path between the first inlet of the shuttle valve and the output of the variable displacement pump; the reversing valve comprises a first station and a second station;
the reversing valve is arranged at a first station, and an oil path between a first inlet of the shuttle valve and the output end of the variable pump is communicated;
the reversing valve is arranged at a second station, and an oil path between a first inlet of the shuttle valve and the output end of the variable pump is disconnected.
In some embodiments, the directional valve includes a first control end and a second control end;
the first control end is provided with a spring and is configured to control the reversing valve to be in a first working position;
the second control end is connected to an oil path between the pressure stabilizing oil source and a second inlet of the shuttle valve, and the second control end is configured to control the reversing valve to be in a second station.
In some embodiments, the valve assembly further comprises a pressure relief valve disposed on an oil path between the first inlet of the shuttle valve and the output of the variable displacement pump; the inlet of the reducing valve is connected with the output end of the variable pump, the outlet of the reducing valve is connected with the first inlet of the shuttle valve, and the set value of the outlet pressure of the reducing valve is lower than the pressure of the hydraulic oil provided by the pressure stabilizing oil source under the second working condition.
In some embodiments, the variable mechanism comprises a first cylinder and a second cylinder;
the cylinder rod of the first cylinder is in driving connection with the variable pump so as to drive the variable pump to change from large displacement to small displacement;
and the cylinder rod of the second cylinder is in driving connection with the variable displacement pump so as to drive the variable displacement pump to change from small displacement to large displacement.
In some embodiments, the variable mechanism comprises a proportional valve and a shut-off valve; the output end of the valve assembly is respectively connected with the proportional valve, the stop valve and the second cylinder, and the proportional valve is sequentially connected with the stop valve and the first cylinder; the stop valve comprises a first station and a second station;
the stop valve is arranged at a first station, and hydraulic oil at the output end of the valve assembly sequentially passes through the proportional valve and the stop valve and enters the first cylinder; the proportional valve is configured to regulate an amount of oil entering the first cylinder;
the trip valve is at the second station, the hydraulic oil warp of valve module output the trip valve gets into first jar.
In some embodiments, the shut-off valve includes a first control end and a second control end;
a spring is arranged at a first control end of the cut-off valve, and the first control end is configured to control the cut-off valve to be at a first station;
the second control end of the cut-off valve is connected with the output end of the variable pump, or the second control end of the cut-off valve is connected with the output end of the variable pump through the valve assembly; the second control end is configured to control the shut-off valve to be in a second station.
Some embodiments of the utility model provide a hoist, it includes foretell variable pump hydraulic control system.
Based on the technical scheme, the utility model discloses following beneficial effect has at least:
in some embodiments, the valve assembly is configured to direct hydraulic oil output from the output of the variable displacement pump to the variable displacement mechanism under a first operating condition, and control the displacement of the variable displacement pump through the variable displacement mechanism; the valve assembly is configured to lead hydraulic oil provided by the pressure stabilizing oil source to the variable displacement mechanism under a second working condition, and the displacement of the variable displacement pump is controlled through the variable displacement mechanism; because the second working condition is a working condition with a larger load, the load pressure fluctuation can cause great influence on the discharge capacity of the variable pump, and therefore, the discharge capacity of the variable pump is adjusted through the pressure stabilizing oil source, and the influence of the load fluctuation on the discharge capacity of the variable pump is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:
fig. 1 is a schematic diagram of a variable displacement pump hydraulic system provided in accordance with some embodiments of the present invention;
fig. 2 is a schematic diagram of a hydraulic system for a variable displacement pump according to further embodiments of the present invention.
The reference numbers in the drawings illustrate the following:
1-a variable pump;
2-a variable mechanism; 21-a first cylinder; 22-a second cylinder; 23-a proportional valve; 24-a shut-off valve;
3-stabilizing the pressure of the oil source;
4-a valve assembly; 41-shuttle valve; 42-a reversing valve; 43-pressure reducing valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the invention.
As shown in fig. 1 and 2, a variable displacement pump hydraulic control system is provided for some embodiments, and includes a variable displacement pump 1, a variable displacement mechanism 2, a pressure-stabilizing oil source 3, and a valve assembly 4.
Alternatively, the variable displacement pump 1 comprises a plunger pump, for example: swash plate type axial variable displacement plunger pump.
The variable mechanism 2 is connected to the variable pump 1, and the variable mechanism 2 is configured to control the displacement of the variable pump 1.
In some embodiments, the variable mechanism 2 controls the displacement of the variable pump 1 to be changed from a large displacement to a small displacement, or the variable mechanism 2 is configured to control the displacement of the variable pump 1 to be changed from a small displacement to a large displacement.
In some embodiments, the regulated pressure oil source 3 includes hydraulic oil supplied by a regulated pressure pump or hydraulic oil supplied by a pressure regulating valve. The pressure of the hydraulic oil provided by the pressure stabilizing oil source 3 is stable.
The input end of the valve component 4 is respectively connected with the output end of the variable pump 1 and the pressure stabilizing oil source 3, and the output end of the valve component 4 is connected with the variable mechanism 2.
The valve assembly 4 is configured to, in a first operating condition, guide hydraulic oil output from the output end of the variable displacement pump 1 to the variable displacement mechanism 2, and control the displacement of the variable displacement pump 1 through the variable displacement mechanism 2.
The valve assembly 4 is configured to direct hydraulic oil supplied from the pressure-stabilizing oil source 3 to the variable mechanism 2 in the second operating condition, and control the displacement of the variable pump 1 by the variable mechanism 2.
The displacement of the variable displacement pump 1 can be well controlled by the variable displacement mechanism 2, but once the load pressure fluctuates, the displacement of the variable displacement pump 1 is affected, so that the output flow is unstable, and the unstable flow is in a hydraulic system, for example: in a lifting system, the conditions of unstable lifting speed and load pressure fluctuation can be caused, the load pressure fluctuation can be fed back to the variable pump 1 to cause the displacement change of the variable pump 1 and aggravate the fluctuation of the displacement, and the two are mutually coupled to cause the instability of the system. Especially for high pressure and small displacement, once the load fluctuates, the small displacement corresponds to a lower speed, and the small-range displacement fluctuation can influence the larger percentage of the micro-motion speed, so that the larger fluctuation of the speed is caused, and the requirement of accurate hoisting on the speed stability is difficult to meet.
Based on this, in some embodiments, the valve assembly 4 is configured to, in the second operating condition, direct the hydraulic oil provided by the pressure-stabilizing oil source 3 to the variable mechanism 2, control the displacement of the variable pump 1 through the variable mechanism 2 to alleviate the influence of the variable pump 1 on the displacement during load pressure fluctuation, and control the displacement of the variable pump 1 by using the constant-pressure oil source provided by the pressure-stabilizing oil source 3 can reduce the influence of the load fluctuation on the displacement of the variable pump 1.
That is, the second operating condition is a condition with a large load, and the load pressure fluctuation has a large influence on the displacement of the variable displacement pump 1. Therefore, the displacement of the variable displacement pump 1 is adjusted by the pressure stabilizing oil source 3 to reduce the influence of load fluctuation on the displacement of the variable displacement pump 1.
The first operating condition is a condition with a small load relative to the second operating condition, and the influence of load pressure fluctuation on the displacement of the variable displacement pump 1 is small.
In some embodiments, the valve assembly 4 comprises a shuttle valve 41, a first inlet of the shuttle valve 41 is connected with the output end of the variable displacement pump 1, a second inlet of the shuttle valve 41 is connected with the stabilized oil source 3, and an outlet of the shuttle valve 41 is connected with the variable displacement mechanism 2.
In some embodiments, under the second operating condition, the pressure of the hydraulic oil provided by the pressure stabilizing oil source 3 is greater than the pressure of the hydraulic oil output by the output end of the variable displacement pump 1, the oil is fed into the second inlet of the shuttle valve 41, the hydraulic oil provided by the pressure stabilizing oil source 3 is guided to the variable displacement mechanism 2, and the displacement of the variable displacement pump 1 is controlled through the variable displacement mechanism 2.
In some embodiments, in the first operating condition, the pressure of the hydraulic oil supplied by the pressure stabilizing oil source 3 is less than the pressure of the hydraulic oil output by the output end of the variable displacement pump 1, or the pressure stabilizing oil source 3 is closed and no hydraulic oil is supplied, the first inlet of the shuttle valve 41 is filled with oil, the hydraulic oil supplied by the variable displacement pump 1 is led to the variable displacement mechanism 2, and the displacement of the variable displacement pump 1 is controlled by the variable displacement mechanism 2.
In some embodiments, as shown in fig. 1, the valve assembly 4 further comprises a direction-changing valve 42, the direction-changing valve 42 being provided on an oil path between the first inlet of the shuttle valve 41 and the output of the variable displacement pump 1; the diverter valve 42 includes a first station and a second station.
The change valve 42 is in the first position, and the oil path between the first inlet of the shuttle valve 41 and the output of the variable displacement pump 1 is communicated.
The change valve 42 is in the second position, and the oil path between the first inlet of the shuttle valve 41 and the output of the variable displacement pump 1 is disconnected.
In some embodiments, the directional valve 42 includes a first control end and a second control end.
A first control end of the directional valve 42 is provided with a spring, and the first control end of the directional valve 42 is configured to control the directional valve 42 in the first position.
A second control end of the direction change valve 42 is connected to an oil path between the steady pressure oil source 3 and the second inlet of the shuttle valve 41, and the second control end of the direction change valve 42 is configured to control the direction change valve 42 to be in the second position.
In some embodiments, a direction change valve 42 is provided on an oil path between the output end of the variable displacement pump 1 and the first inlet of the shuttle valve 41, and a second control end of the direction change valve 42 is connected to an oil path between the surge tank 3 and the second inlet of the shuttle valve 41. The constant pressure oil source 3 provides constant pressure hydraulic oil, and the reversing pressure of the reversing valve 42 is lower than the constant pressure of the hydraulic oil provided by the constant pressure oil source 3, so that when the constant pressure oil source 3 provides constant pressure hydraulic oil, the reversing valve 42 is in the second station, and the oil path between the output end of the variable pump 1 and the first inlet of the shuttle valve 41 is cut off, so that the displacement change of the variable pump 1 is controlled by the external constant pressure oil source 3, therefore, even if the load fluctuates, the displacement of the variable pump 1 is not influenced, and when the variable pump 1 does not need to work, the external constant pressure oil source 3 adjusts the displacement of the variable pump 1 to the minimum displacement.
Under the condition that the pressure stabilizing oil source 3 has no pressure input, the reversing valve 42 is positioned at the first station under the action of the spring force of the first control end of the reversing valve 42, the oil path between the variable pump 1 and the first inlet of the shuttle valve 41 is communicated, the hydraulic oil at the output end of the variable pump 1 enters the variable mechanism 2, and the displacement of the variable pump 1 is adjusted through the variable mechanism 2, so that even if the pressure stabilizing oil source 3 has a problem, the variable pump 1 can still normally work, and the displacement of the variable pump 1 can still be adjusted to the minimum displacement.
In some embodiments, as shown in fig. 2, the valve assembly 4 further comprises a pressure reducing valve 43, the pressure reducing valve 43 being provided on the oil path between the first inlet of the shuttle valve 41 and the output of the variable displacement pump 1. An inlet of the pressure reducing valve 43 is connected to an output end of the variable displacement pump 1, and an outlet of the pressure reducing valve 43 is connected to a first inlet of the shuttle valve 41. The outlet pressure setting of the relief valve 43 is lower than the pressure of the hydraulic oil supplied from the source of regulated oil 3 in the second operating condition.
In some embodiments, a pressure reducing valve 10 is disposed on an oil path between the variable displacement pump 1 and the first inlet of the shuttle valve 41, the inlet of the pressure reducing valve 10 is connected to the output end of the variable displacement pump 1, the outlet of the pressure reducing valve 10 is connected to the first inlet of the shuttle valve 41, and the pressure at the output end of the variable displacement pump 1 is reduced by a pressure reducing valve 43 to form a stable pressure, and then the stable pressure is introduced into the shuttle valve 41, so that the hydraulic oil for controlling the displacement change of the variable displacement pump 1 is the hydraulic oil with a constant pressure.
When the pressure stabilizing oil source 3 is started, the pressure stabilizing oil source 3 provides hydraulic oil with stable pressure to control the displacement change of the variable displacement pump 1, so that the hydraulic oil controlling the displacement change of the variable displacement pump 1 has constant pressure all the time. And when the pressure stabilizing oil source 3 has a problem, the normal work of the variable displacement pump 1 can still be ensured.
In some embodiments, the outlet pressure setting value of the pressure reducing valve 43 is lower than the pressure of the hydraulic oil supplied by the pressure stabilizing oil source 3 under the second operating condition, and the displacement variation of the variable displacement pump 1 can be always controlled by the hydraulic oil with constant pressure supplied by the pressure stabilizing oil source 3 under the normal condition, so as to avoid the situation of displacement fluctuation of the variable displacement pump 1 caused by switching of the shuttle valve 41.
In some embodiments, the variable mechanism 2 includes a first cylinder 21 and a second cylinder 22.
The cylinder rod of the first cylinder 21 is connected with the variable displacement pump 1 in a driving mode, and the cylinder rod of the first cylinder 21 extends out to drive the variable displacement pump 1 to change from large displacement to small displacement.
The cylinder rod of the second cylinder 22 is connected with the variable displacement pump 1 in a driving mode, and the cylinder rod of the second cylinder 22 extends out to drive the variable displacement pump 1 to change from small displacement to large displacement.
The first cylinder 21 and the second cylinder 22 interact with each other, so that the continuous change of the displacement of the variable displacement pump 1 is guaranteed, and the oil inlets of the first cylinder 21 and the second cylinder 22 are provided with damping so as to improve the stability of the displacement change of the variable displacement pump 1.
In some embodiments, the variable mechanism 2 includes a proportional valve 23 and a shut-off valve 24. The output end of the valve assembly 4 is connected with a proportional valve 23, a cut-off valve 24 and a second cylinder 22 respectively. The proportional valve 23 connects the shut-off valve 24 and the first cylinder 21 in this order. The shut-off valve 24 comprises a first station and a second station.
The cut-off valve 24 is arranged at a first station, and hydraulic oil output by the output end of the valve component 4 sequentially enters the first cylinder 21 through the proportional valve 23 and the cut-off valve 24; the proportional valve 23 is configured to adjust the amount of oil entering the first cylinder 21 to adjust the displacement of the variable displacement pump 1.
The stop valve 24 is at the second position, and the hydraulic oil output by the output end of the valve assembly 4 enters the first cylinder 21 through the stop valve 24 to adjust the displacement of the variable displacement pump 1.
In some embodiments, the shut-off valve 24 includes a first port, a second port, and a third port, the first port of the shut-off valve 24 is connected to the proportional valve 23, the second port of the shut-off valve 24 is connected to the first cylinder 21, and the third port of the shut-off valve 24 is connected to the output of the valve assembly 4. The stop valve 24 is arranged at the first station, the first oil port is communicated with the second oil port, the third oil port is cut, the stop valve 24 is arranged at the second station, the first oil port is cut, and the second oil port is communicated with the third oil port.
In some embodiments, proportional valve 23 is an electronically controlled proportional valve. The electric control proportional valve adjusts the opening size of the electric control proportional valve through an electric proportional signal so as to adjust the hydraulic oil quantity passing through the electric control proportional valve and further adjust the displacement of the variable pump 1, so that the change of the displacement of the variable pump 1 is in proportion to the electric proportional signal.
In some embodiments, the proportional valve 23 includes a first position and a second position, the proportional valve 23 being in the first position, and hydraulic oil output from the output of the valve assembly 4 passes through the proportional valve 23 into the shut-off valve 24 and finally into the first cylinder 21. In the second position of the proportional valve 23, the hydraulic oil output from the outlet of the valve assembly 4 is cut off at the proportional valve 23 and does not flow through the proportional valve 23 into the shut-off valve 24, but directly through the shut-off valve 24 into the first cylinder 21.
In some embodiments, the proportional valve 23 includes a first port, a second port, and a third port, the first port of the proportional valve 23 is connected to the output end of the valve assembly 4, the second port of the proportional valve 23 is communicated with the first port of the shut-off valve 24, and the third port of the proportional valve 23 is communicated with the oil cylinder. The first oil port is communicated with the second oil port when the proportional valve 23 is in the first station, the first oil port is cut off when the proportional valve 23 is in the second station, and the second oil port is communicated with the third oil port.
In some embodiments, the shut-off valve 24 includes a first control end and a second control end.
A first control end of the shut-off valve 24 is provided with a spring, the first control end of the shut-off valve 24 being configured to control the shut-off valve 24 in the first position.
The second control end of the cut-off valve 24 is connected with the output end of the variable displacement pump 1. Alternatively, the second control end of the shut-off valve 24 is connected to the output end of the variable displacement pump 1 through the valve assembly 4.
A second control end of the shut-off valve 24 is configured to control the shut-off valve 24 in the second station.
In some embodiments, the hydraulic oil for controlling the displacement change of the variable displacement pump 1 is derived from the outlet of the shuttle valve 41 of the valve assembly 4, the first inlet of the shuttle valve 41 is connected with the output end of the variable displacement pump 1, the second inlet of the shuttle valve 41 is connected with the stable pressure oil source 3, and the stable pressure oil source 3 is externally connected with stable pilot oil so as to adjust the displacement of the variable displacement pump 1 to the minimum displacement when the variable displacement pump 1 does not need to work.
In some embodiments, the outlets of the shuttle valve 41 are connected to the third port of the shut-off valve 24, the first port of the proportional valve 23, and the second cylinder 22, respectively.
Alternatively, the outlet of the shuttle valve 41 is connected to the second control end of the shut-off valve 24 as shown in fig. 1, or the output of the variable displacement pump 1 is connected to the second control end of the shut-off valve 24 as shown in fig. 2.
When the load pressure reaches the pressure set value of the second control end of the shut-off valve 24, the shut-off valve 24 is in the second station to increase the oil inlet amount of the first cylinder 21 and decrease the displacement of the variable displacement pump 1, so that the working pressure of the variable displacement pump 1 is lower than the set value.
Some embodiments also provide a crane comprising the variable pump hydraulic system described above.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are only used for the convenience of distinguishing the components, and if not stated otherwise, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Furthermore, the technical features of one embodiment may be combined with one or more other embodiments advantageously without explicit negatives.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (10)
1. A variable displacement pump hydraulic control system, comprising:
a variable displacement pump (1);
a variable displacement mechanism (2) connected with the variable displacement pump (1) and configured to control the displacement of the variable displacement pump (1);
a source of regulated oil (3); and
the input end of the valve component (4) is respectively connected with the output end of the variable pump (1) and the pressure stabilizing oil source (3), and the output end of the valve component (4) is connected with the variable mechanism (2);
the valve assembly (4) is configured to lead hydraulic oil at the output end of the variable pump (1) to the variable mechanism (2) under a first working condition, and the displacement of the variable pump (1) is controlled through the variable mechanism (2);
the valve assembly (4) is configured to lead hydraulic oil provided by the stable pressure oil source (3) to the variable mechanism (2) under a second working condition, and the displacement of the variable pump (1) is controlled through the variable mechanism (2).
2. The variable displacement pump hydraulic control system as defined in claim 1, wherein in the second operating condition, the pressure of the hydraulic oil supplied from the regulated oil source (3) is greater than the pressure of the hydraulic oil supplied from the output of the variable displacement pump (1).
3. The variable displacement pump hydraulic control system as claimed in claim 1, wherein the valve assembly (4) comprises a shuttle valve (41), a first inlet of the shuttle valve (41) is connected with the output end of the variable displacement pump (1), a second inlet of the shuttle valve (41) is connected with the pressure stabilizing oil source (3), and an outlet of the shuttle valve (41) is connected with the variable displacement mechanism (2).
4. The variable pump hydraulic system according to claim 3, wherein the valve assembly (4) further comprises a direction change valve (42), the direction change valve (42) being provided on an oil path between a first inlet of the shuttle valve (41) and an output of the variable pump (1); the diverter valve (42) includes a first station and a second station;
the reversing valve (42) is arranged at a first station, and an oil path between a first inlet of the shuttle valve (41) and an output end of the variable displacement pump (1) is communicated;
the reversing valve (42) is in the second working position, and an oil path between the first inlet of the shuttle valve (41) and the output end of the variable displacement pump (1) is disconnected.
5. The variable pump hydraulic system of claim 4, wherein the reversing valve (42) includes a first control end and a second control end;
the first control end is provided with a spring and is configured to control the reversing valve (42) to be in a first working position;
the second control end is connected to an oil path between the pressure-stabilizing oil source (3) and a second inlet of the shuttle valve (41), and the second control end is configured to control the reversing valve (42) to be in a second working position.
6. The variable pump hydraulic system according to claim 3, wherein the valve assembly (4) further comprises a pressure reducing valve (43), the pressure reducing valve (43) being provided on an oil path between the first inlet of the shuttle valve (41) and the output of the variable pump (1); the inlet of the reducing valve (43) is connected with the output end of the variable pump (1), the outlet of the reducing valve (43) is connected with the first inlet of the shuttle valve (41), and the set value of the outlet pressure of the reducing valve (43) is lower than the pressure of the hydraulic oil provided by the pressure stabilizing oil source (3) under the second working condition.
7. The variable pump hydraulic control system according to claim 1, wherein the variable mechanism (2) includes a first cylinder (21) and a second cylinder (22);
the cylinder rod of the first cylinder (21) is in driving connection with the variable pump (1) so as to drive the variable pump (1) to change from large displacement to small displacement;
the cylinder rod of the second cylinder (22) is in driving connection with the variable displacement pump (1) so as to drive the variable displacement pump (1) to change from small displacement to large displacement.
8. The variable pump hydraulic system according to claim 7, wherein the variable mechanism (2) includes a proportional valve (23) and a shut-off valve (24); the output end of the valve assembly (4) is respectively connected with the proportional valve (23), the cut-off valve (24) and the second cylinder (22), and the proportional valve (23) is sequentially connected with the cut-off valve (24) and the first cylinder (21); the shut-off valve (24) comprises a first station and a second station;
the shut-off valve (24) is arranged at a first station, and hydraulic oil at the output end of the valve assembly (4) sequentially passes through the proportional valve (23) and the shut-off valve (24) and enters the first cylinder (21); the proportional valve (23) is configured to regulate the amount of oil entering the first cylinder (21);
the stop valve (24) is at the second station, the hydraulic oil of valve module (4) output is through stop valve (24) gets into first cylinder (21).
9. The variable pump hydraulic system of claim 8, wherein the shut-off valve (24) includes a first control end and a second control end;
a first control end of the cut-off valve (24) is provided with a spring and is configured to control the cut-off valve (24) to be in a first station;
the second control end of the cut-off valve (24) is connected with the output end of the variable pump (1), or the second control end of the cut-off valve (24) is connected with the output end of the variable pump (1) through the valve component (4); the second control end is configured to control the shut-off valve (24) to be in a second position.
10. A crane comprising a variable displacement pump hydraulic system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922020143.XU CN211366734U (en) | 2019-11-21 | 2019-11-21 | Variable pump hydraulic control system and crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922020143.XU CN211366734U (en) | 2019-11-21 | 2019-11-21 | Variable pump hydraulic control system and crane |
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| CN211366734U true CN211366734U (en) | 2020-08-28 |
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| CN201922020143.XU Active CN211366734U (en) | 2019-11-21 | 2019-11-21 | Variable pump hydraulic control system and crane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460086A (en) * | 2020-11-30 | 2021-03-09 | 徐州重型机械有限公司 | Composite speed-regulating hydraulic system and control method thereof, crane and engineering machinery |
-
2019
- 2019-11-21 CN CN201922020143.XU patent/CN211366734U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460086A (en) * | 2020-11-30 | 2021-03-09 | 徐州重型机械有限公司 | Composite speed-regulating hydraulic system and control method thereof, crane and engineering machinery |
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