CN216689565U - Hydraulic quick-change device control loop for excavator - Google Patents
Hydraulic quick-change device control loop for excavator Download PDFInfo
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- CN216689565U CN216689565U CN202123276302.6U CN202123276302U CN216689565U CN 216689565 U CN216689565 U CN 216689565U CN 202123276302 U CN202123276302 U CN 202123276302U CN 216689565 U CN216689565 U CN 216689565U
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Abstract
The utility model discloses a hydraulic quick-change device control loop for an excavator, which comprises: the quick-change oil cylinder comprises a rod cavity and a rodless cavity; the first reversing valve is used for switching a rod cavity and a rodless cavity into oil, and is connected with the rod cavity through a rod cavity oil way and connected with the rodless cavity through a rodless cavity oil way; the load-sensitive pump is used for providing a hydraulic source for the action of a movable arm of the excavator; a first hydraulic pressure source having hydraulic oil of a stable pressure; and two oil inlets of the shuttle valve are respectively connected with an oil outlet of the load sensitive pump and the first hydraulic source, and an oil outlet of the shuttle valve is connected with an oil inlet of the first reversing valve through a first oil inlet path. By introducing the first hydraulic source and under the selective action of the shuttle valve, the first oil inlet path can be ensured to have the oil source pressure at least not lower than the first hydraulic source and output to the quick-change oil cylinder, the rodless cavity pressure maintaining of the quick-change oil cylinder is facilitated, and meanwhile compared with the prior art, the continuous loading of a load sensitive pump and an engine can be avoided.
Description
Technical Field
The utility model relates to the technical field of hydraulic control of engineering machinery, in particular to a control loop of a hydraulic quick-change device for an excavator.
Background
For an excavator, a bucket or other accessories and the like are generally required to be replaced according to different use conditions, and at present, the bucket or other accessories are mainly replaced through a hydraulic quick-change device.
The hydraulic quick-change device comprises an oil cylinder and a hydraulic circuit for controlling the action of the oil cylinder, so that the oil cylinder is controlled to stretch and retract through the hydraulic circuit, and the bucket or other accessories are pushed or loosened. After the excavator is started, high-pressure oil inlet and pressure maintaining of a rodless cavity of an oil cylinder of the hydraulic quick-change device need to be ensured, so that a piston rod of the oil cylinder extends out, a bucket or other accessories are locked, and the bucket or other accessories are prevented from falling off during operation of the excavator; when the bucket or other accessories need to be replaced, the rod cavity of the oil cylinder of the hydraulic quick-change device needs to be fed with oil so as to retract the piston rod of the oil cylinder, so that the bucket or other accessories can be loosened, and the bucket or other accessories can be replaced.
In the prior art, a hydraulic loop of a hydraulic quick-change device mainly adopts a main pump of an excavator to supply oil to an oil cylinder of the hydraulic quick-change device, and realizes the switching of oil feeding of a rod cavity and a rodless cavity of the oil cylinder by utilizing a conventional reversing valve. Or the pilot oil source is directly used for supplying oil, and the oil inlet switching of the rod cavity and the rodless cavity of the oil cylinder is carried out by utilizing the reversing valve.
However, in the hydraulic circuit for supplying oil to the main pump, if continuous pressure maintaining is to be realized in a rodless cavity of an oil cylinder of a hydraulic quick-change device during starting and operating of the excavator, the main pump and an engine of the excavator are continuously loaded, otherwise, the rodless cavity of the oil cylinder cannot be continuously maintained, and a bucket or other accessories are easily dropped. For a hydraulic quick-change loop directly using a pilot oil source, the hydraulic quick-change loop cannot adapt to most hydraulic quick-change devices due to insufficient oil supply pressure, for example, the jacking pressure of the hydraulic quick-change devices is insufficient, or the hydraulic quick-change devices cannot be opened when buckets and accessories are replaced.
In summary, a problem to be solved by those skilled in the art is how to prevent a bucket or other accessories from falling off and ensure that a hydraulic quick-change device is normally opened without continuously loading a main pump and an engine of an excavator.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a control circuit for a hydraulic quick-change device for an excavator, which can prevent a bucket or other accessories from falling down and ensure that the hydraulic quick-change device is normally opened without continuously loading a main pump and an engine of the excavator.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a hydraulic quick-change device control circuit for an excavator comprises:
the quick-change oil cylinder comprises a rod cavity and a rodless cavity;
the first reversing valve is used for switching the rod cavity and the rodless cavity into oil, and is connected with the rod cavity through a rod cavity oil way and connected with the rodless cavity through a rodless cavity oil way;
the load-sensitive pump is used for providing a hydraulic source for the action of a movable arm of the excavator;
a first hydraulic pressure source having hydraulic oil of a stable pressure;
and two oil inlets of the shuttle valve are respectively connected with the oil outlet of the load sensitive pump and the first hydraulic source, and the oil outlet of the shuttle valve is connected with the oil inlet of the first reversing valve through a first oil inlet path.
Preferably, the first oil inlet passage or the rodless cavity oil passage is provided with a pressure reducing valve.
Preferably, a pressure feedback oil path is arranged between the first reversing valve and the load-sensitive pump, the pressure feedback oil path is provided with a switch valve, and the switch valve and the first reversing valve are simultaneously powered on and powered off, so that when the first reversing valve acts to change the oil inlet of the rod-free cavity into the oil inlet of the rod-containing cavity of the quick-change oil cylinder, the switch valve is opened to feed back the pressure in the rod-containing cavity to the load-sensitive pump through the pressure feedback oil path.
Preferably, a first throttling damper is arranged between the shuttle valve and the intersection of the pressure feedback oil path and the first oil inlet path.
Preferably, the first oil inlet path and the pressure feedback oil path are respectively provided with a check valve.
Preferably, the shuttle valve, the pressure reducing valve, the first throttling damper, the first direction changing valve, the switching valve and the check valve are integrated into one valve train.
Preferably, the pressure trip valve of load sensitive pump is equipped with the external control mouth, the external control mouth is connected with the pilot control valves group, the pilot control valves group is including the hydraulic pressure oil circuit and the oil return way of parallel arrangement, the hydraulic pressure oil circuit is equipped with second throttle damping and the pilot control valve of establishing ties, the oil inlet and the second hydraulic pressure source of pilot control valve link to each other, the second hydraulic pressure source has the hydraulic oil of steady pressure, the oil return mouth of pilot control valve with the oil return way links to each other, the oil return way is equipped with third throttle damping.
Preferably, the first hydraulic pressure source and the second hydraulic pressure source are the same hydraulic pressure source.
Preferably, the pilot control valve is an electric proportional pressure reducing valve, an electric control two-position three-way switching valve or a hydraulic control two-position three-way switching valve.
Preferably, the hydraulic lock is used for locking the oil path with the rod cavity and the oil path without the rod cavity respectively.
According to the control circuit of the hydraulic quick-change device for the excavator, the first hydraulic source is introduced, and under the selection action of the shuttle valve, the first oil inlet path can be ensured to have the oil source pressure at least not lower than that of the first hydraulic source to be output to the quick-change oil cylinder, the rodless cavity pressure maintaining of the quick-change oil cylinder is facilitated, and meanwhile compared with the prior art, the continuous loading of a load sensitive pump and an engine can be avoided.
In addition, when the bucket or other accessories need to be replaced, the first reversing valve is used for reversing, under the action of the shuttle valve, the first hydraulic source or the load sensitive pump can be used for supplying oil to the rod cavity of the quick-change oil cylinder, the first oil inlet path is ensured to have oil source pressure at least not lower than that of the first hydraulic source, the oil source pressure is output to the quick-change oil cylinder, the quick-change oil cylinder is unlocked under high pressure, and the bucket or other accessories are ensured to be smoothly separated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a control schematic diagram of a control circuit of a hydraulic quick-change device for an excavator according to a first embodiment of the present invention;
fig. 2 is a control schematic diagram of a control circuit of a hydraulic quick-change device for an excavator according to a second embodiment of the present invention;
fig. 3 is a control schematic diagram of a control circuit of a hydraulic quick-change device for an excavator according to a third embodiment of the present invention.
The reference numerals in fig. 1 to 3 are as follows:
the hydraulic control system comprises a quick-change oil cylinder 1, a first reversing valve 2, a load-sensitive pump 3, a shuttle valve 4, a pressure reducing valve 5, a switch valve 6, a first throttling damper 7, a one-way valve 8, a valve coupling 9, a pressure cut-off valve 10, a pilot control valve group 11, a second throttling damper 111, a pilot control valve 112, a third throttling damper 113, a hydraulic lock 12, a pilot pump 13, a second reversing valve 14, a pressure compensator 15 and a boom oil cylinder 16.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The core of the utility model is to provide a control circuit of a hydraulic quick-change device for an excavator, which is used for preventing a bucket or other accessories from falling off under the condition that a main pump and an engine of the excavator are not required to be loaded continuously, and simultaneously ensuring that the hydraulic quick-change device can be opened smoothly when the bucket or other accessories are replaced.
Referring to fig. 1 to fig. 3, fig. 1 is a control schematic diagram of a hydraulic quick-change device control circuit for an excavator according to an embodiment of the present invention; fig. 2 is a control schematic diagram of a control circuit of a hydraulic quick-change device for an excavator according to a second embodiment of the present invention; fig. 3 is a control schematic diagram of a control circuit of a hydraulic quick-change device for an excavator according to a third embodiment of the present invention.
The utility model provides a hydraulic quick-change device control loop for an excavator, which comprises a quick-change oil cylinder 1, a first reversing valve 2, a load sensitive pump 3, a first hydraulic source and a shuttle valve 4. Specifically, the quick-change oil cylinder 1 comprises a rod cavity and a rodless cavity, the first reversing valve 2 is used for switching the direction of an oil path so as to enable the rod cavity and the rodless cavity to be switched into oil, and the first reversing valve 2 is connected with the rod cavity through an oil path of the rod cavity and is connected with the rodless cavity through an oil path of the rodless cavity; the load sensitive pump 3 is used for providing a hydraulic source for the action of a movable arm of the excavator; the first hydraulic pressure source is provided with hydraulic oil with stable pressure; two oil inlets of the shuttle valve 4 are respectively connected with an oil outlet of the load sensitive pump 3 and a first hydraulic source, and an oil outlet of the shuttle valve 4 is connected with an oil inlet of the first reversing valve 2 through a first oil inlet path.
That is, the present invention selects the higher pressure of the oil outlet of the load-sensitive pump 3 and the first hydraulic pressure source through the shuttle valve 4 to supply the oil to the quick-change oil cylinder 1 by using the higher pressure of the oil outlet of the load-sensitive pump 3 and the first hydraulic pressure source.
It can be understood that, when the excavator is started (at this time, the movable arm of the excavator does not work, and there is no action), the load-sensitive pump 3 is in a state of waiting for loading, the pressure at the oil outlet of the load-sensitive pump 3 is relatively low, at this time, the pressure at the oil outlet of the load-sensitive pump 3 is insufficient to provide reliable pressure for the quick-change oil cylinder 1, that is, a rodless cavity of the quick-change oil cylinder 1 cannot enter a high-pressure oil source and maintain pressure, so that a piston rod of the quick-change oil cylinder 1 is easily retracted, and a bucket or other accessories are easily dropped. Therefore, the first hydraulic source is introduced to assist in providing a high-pressure oil source for the quick-change oil cylinder 1, when the excavator is started, the pressure at the oil outlet of the load sensitive pump 3 is low, and at the moment, the pressure of the first hydraulic source needs to be higher than the pressure at the oil outlet of the load sensitive pump 3, so that the first hydraulic source provides hydraulic pressure for a rodless cavity of the quick-change oil cylinder 1, the quick-change oil cylinder 1 can be locked, and a bucket or other accessories can be prevented from falling.
When a movable arm of the excavator acts, the load sensitive pump 3 works, an oil outlet of the load sensitive pump 3 has pressure higher than that of the first hydraulic source, and at the moment, under the action of the shuttle valve 4, the load sensitive pump 3 provides hydraulic oil for the quick-change oil cylinder 1.
That is, the first hydraulic source is introduced, and under the selective action of the shuttle valve 4, the pressure of the oil source at least not lower than that of the first hydraulic source in the first oil inlet path can be ensured to be output to the quick-change oil cylinder 1, which is beneficial to maintaining the pressure of the rodless cavity of the quick-change oil cylinder 1, and meanwhile, the load-sensitive pump 3 and the engine can be prevented from being continuously loaded (it can be understood that, if the first hydraulic source does not exist, even if the movable arm of the excavator does not act when the quick-change oil cylinder 1 is supplied with oil only by the load-sensitive pump 3, the load-sensitive pump 3 and the engine need to be loaded).
Similarly, when the bucket or other accessories need to be replaced, the first reversing valve 2 is used for reversing, and under the action of the shuttle valve 4, the first hydraulic source or the load sensitive pump 3 can supply oil to the rod cavity of the quick-change oil cylinder 1, so that the first oil inlet path is ensured to have oil source pressure at least not lower than that of the first hydraulic source and output the oil source pressure to the quick-change oil cylinder 1, the quick-change oil cylinder 1 is unlocked by using high pressure, and the bucket or other accessories are ensured to be smoothly separated.
It should be noted that, in this embodiment, the specific structure of the first direction valve 2 is not limited as long as it can perform a direction changing function, and as shown in fig. 1, preferably, the first direction valve 2 is an electromagnetic two-position four-way direction valve. It can be understood that the oil inlet of the first reversing valve 2 is connected with a first oil inlet path, the two working oil ports of the first reversing valve 2 are respectively connected with a rod cavity oil path and a rodless cavity oil path, and the oil return port of the first reversing valve 2 is connected with an oil return path so as to enable oil to flow back to the oil tank.
The load-sensitive pump 3 belongs to a main pump for providing a hydraulic source for the action of a movable arm of an excavator in the excavator, and the structure of the load-sensitive pump can be referred to the prior art, and is not described in detail herein. In the utility model, the load sensitive pump 3 also has the function of providing a hydraulic source for the quick-change oil cylinder 1.
In addition, the first hydraulic source is not specifically limited in this embodiment, for example, the first hydraulic source may include a pilot pump 13, and when the pressure at the oil outlet of the load sensitive pump 3 is low, the pilot pump 13 provides a hydraulic source for the quick-change oil cylinder 1. Of course, the first hydraulic pressure source may be an accumulator or other oil passage having a stable pressure as long as it has hydraulic oil of a stable pressure.
In addition, because the pressure of the oil outlet of the load-sensitive pump 3 is higher than the requirement of the quick-change oil cylinder 1 during normal operation of the excavator, the first oil inlet path or the rodless cavity oil path is provided with the pressure reducing valve 5 on the basis of the above embodiment in view of safety. That is, in the present embodiment, by providing the pressure reducing valve 5, the high-pressure oil source during normal operation of the excavator is reduced to the set pressure and then output to the rodless cavity of the quick-change oil cylinder 1, so that the quick-change oil cylinder 1 is locked. As shown in fig. 1 and 3, the pressure reducing valve 5 is provided in the first oil inlet passage; as shown in fig. 2, the pressure reducing valve 5 is provided in the rodless cavity oil passage.
Further, on the basis of the above embodiment, a pressure feedback oil path is provided between the first direction valve 2 and the load-sensitive pump 3, the pressure feedback oil path is provided with a switch valve 6, and the switch valve 6 and the first direction valve 2 are simultaneously powered on and powered off, so that when the first direction valve 2 acts to change the oil inlet of the quick-change oil cylinder 1 from the oil inlet of the rodless cavity to the oil inlet of the rod cavity, the switch valve 6 is opened to feed back the pressure in the rod cavity to the load-sensitive pump 3 through the pressure feedback oil path.
That is to say, when oil enters the rodless cavity of the quick-change oil cylinder 1, the switch valve 6 is closed, so that the pressure feedback oil path is disconnected, pressure feedback is not needed at the moment, the rodless cavity is ensured to have continuous pressure, and the quick-change oil cylinder 1 is ensured not to loosen; when the first reversing valve 2 acts to enable the rod cavity of the quick-change oil cylinder 1 to feed oil, the switch valve 6 is opened to enable the pressure feedback oil path to be communicated, so that the working state of the first reversing valve 2 is switched or the pressure in the rod cavity is fed back to the load sensitive pump 3 through the pressure feedback oil path, and the load sensitive pump 3 adjusts the flow output according to the pressure fed back by the pressure feedback oil path.
It should be noted that, in this embodiment, the specific structure of the on-off valve 6 is not limited, and preferably, the on-off valve 6 is a two-position two-way valve.
Further, on the basis of the above embodiment, a first throttling damper 7 is arranged between the intersection of the pressure feedback oil path and the first oil inlet path and the shuttle valve 4. It can be understood that the cross-sectional area of the orifice of the first orifice damper 7 and the pressure difference between the two ends of the first orifice damper 7 determine the flow rate of the first oil inlet circuit, that is, the load-sensitive pump 3 can provide accurate flow output according to the pressure fed back by the pressure feedback circuit and the size of the first orifice damper 7, so as to ensure the smoothness of the action of the quick-change oil cylinder 1.
In addition, in order to avoid backflow of oil in the first oil inlet path and the pressure feedback oil path, on the basis of the above embodiments, the first oil inlet path and the pressure feedback oil path are respectively provided with a check valve 8. It can be understood that the one-way valve 8 arranged on the first oil inlet ensures that oil can only flow from the shuttle valve 4 to the first reversing valve 2 and can not flow in the reverse direction; the one-way valve 8 provided in the pressure feedback oil path ensures that oil can only flow from the first directional control valve 2 to the load sensitive pump 3 and not in the reverse direction.
Further, in consideration of the convenience of installation, as a preferable scheme, on the basis of the above embodiment, the shuttle valve 4, the pressure reducing valve 5, the first orifice damper 7, the first direction changing valve 2, the switching valve 6 and the check valve 8 are integrated into one valve train 9. That is, in the present embodiment, the functions of the shuttle valve 4, the pressure reducing valve 5, the first throttling damper 7, the first direction changing valve 2, the on-off valve 6, and the check valve 8 are integrated into a single structural unit, and the single structural unit is used as a valve coupling 9, so that the functions of the shuttle valve 4, the pressure reducing valve 5, the first throttling damper 7, the first direction changing valve 2, the on-off valve 6, and the check valve 8 can be realized.
In addition, when a piston rod of the quick-change oil cylinder 1 moves to the bottom of the rodless cavity or is stuck in the moving process, in order to avoid system overflow loss, and ensure hydraulic energy conservation and high efficiency, on the basis of the above embodiment, the pressure cut-off valve 10 of the load-sensitive pump 3 is provided with an external control port, the external control port is connected with the pilot control valve group 11, the pilot control valve group 11 comprises a hydraulic oil path and an oil return path which are arranged in parallel, the hydraulic oil path is provided with a second throttling damper 111 and a pilot control valve 112 which are connected in series, an oil inlet of the pilot control valve 112 is connected with a second hydraulic source, the second hydraulic source is provided with hydraulic oil with stable pressure, the oil return port of the pilot control valve 112 is connected with the oil return path, and the oil return path is provided with a third throttling damper 113.
That is to say, in the present embodiment, the pilot valve group 11 is added to provide remote pilot pressure control for the external control port of the pressure cut-off valve 10, and the pilot valve 112 of the pilot valve group 11 is connected to the second hydraulic source to change the set pressure of the pressure cut-off valve 10, so that when the piston rod of the quick-change oil cylinder 1 is retracted to the bottom of the rodless cavity or when the piston rod is stuck during the movement, the second hydraulic source provides a certain hydraulic pressure for the pressure cut-off valve 10 by controlling the pilot valve group 11, so that the load-sensitive pump 3 can be in a constant pressure cut-off state, only the minimum flow required for maintaining the pressure is provided, and the hydraulic overflow loss is avoided, and meanwhile, by adjusting the opening degree of the pilot valve 112 in the pilot valve group 11, the quick-change oil cylinder 1 with different pressure requirements is applicable.
Preferably, on the basis of the above embodiment, the first hydraulic pressure source and the second hydraulic pressure source are the same hydraulic pressure source.
It should be noted that, in the present embodiment, a specific structure of the pilot control valve 112 is not limited, and preferably, in addition to the above embodiments, the pilot control valve 112 is an electric proportional pressure reducing valve (as shown in fig. 1 and 2), an electrically controlled two-position three-way switching valve (as shown in fig. 3), or a hydraulically controlled two-position three-way switching valve. In addition, in order to maintain the pressure in the rod chamber and the rodless chamber of the quick-change oil cylinder 1, on the basis of the above embodiment, a hydraulic lock 12 is further included for locking the rod chamber oil path and the rodless chamber oil path, respectively, to ensure that the pressure in the rodless chamber or the rod chamber is maintained for a longer time.
It should be noted that the hydraulic lock 12 and the quick-change oil cylinder 1 may be a split structure or an integrated structure, that is, the hydraulic lock 12 may be integrated on the quick-change oil cylinder 1, so that the quick-change oil cylinder 1 has a self-pressure-maintaining function.
In addition, as can be understood by those skilled in the art, as shown in fig. 1 to 3, a second direction valve 14, a pressure compensator 15 and a boom cylinder 16 are further included, that is, hydraulic oil is provided to the boom cylinder 16 through the load sensitive pump 3 to control the movement of the boom cylinder 16, so as to implement the movement of the boom of the excavator, and the second direction valve 14 is used for switching the oil inlet direction of the boom cylinder 16.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The control circuit of the hydraulic quick-change device for the excavator provided by the utility model is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a hydraulic pressure quick change device control circuit for excavator which characterized in that includes:
the quick-change oil cylinder (1) comprises a rod cavity and a rodless cavity;
the first reversing valve (2) is used for switching the rod cavity and the rodless cavity into oil, and the first reversing valve (2) is connected with the rod cavity through a rod cavity oil way and is connected with the rodless cavity through a rodless cavity oil way;
a load-sensitive pump (3) for providing a hydraulic source for the boom action of the excavator;
a first hydraulic pressure source having hydraulic oil of a stable pressure;
and two oil inlets of the shuttle valve (4) are respectively connected with the oil outlet of the load sensitive pump (3) and the first hydraulic source, and the oil outlet of the shuttle valve (4) is connected with the oil inlet of the first reversing valve (2) through a first oil inlet path.
2. The hydraulic quick-change device control circuit for excavators according to claim 1, characterized in that the first oil feed line or the rodless cavity oil line is provided with a pressure reducing valve (5).
3. The hydraulic quick-change device control circuit for the excavator according to claim 2, wherein a pressure feedback oil path is arranged between the first reversing valve (2) and the load-sensitive pump (3), the pressure feedback oil path is provided with a switch valve (6), the switch valve (6) and the first reversing valve (2) are simultaneously powered on and powered off, so that when the first reversing valve (2) acts to change the quick-change oil cylinder (1) from the rodless cavity oil inlet to the rod cavity oil inlet, the switch valve (6) is opened to feed back the pressure in the rod cavity to the load-sensitive pump (3) through the pressure feedback oil path.
4. The hydraulic quick-change device control circuit for the excavator according to claim 3, wherein a first throttling damper (7) is arranged between the shuttle valve (4) and the junction of the pressure feedback oil path and the first oil inlet path.
5. The hydraulic quick-change device control circuit for the excavator according to claim 4, wherein the first oil inlet circuit and the pressure feedback oil circuit are respectively provided with a check valve (8).
6. Hydraulic quick-change device control circuit for excavators according to claim 5, characterized in that the shuttle valve (4), the pressure reducing valve (5), the first throttling damping (7), the first directional valve (2), the switching valve (6) and the one-way valve (8) are integrated into one valve train (9).
7. The hydraulic quick-change device control circuit for the excavator according to claim 1, wherein the pressure cut-off valve (10) of the load-sensitive pump (3) is provided with an external control port, the external control port is connected with a pilot control valve group (11), the pilot control valve group (11) comprises a hydraulic oil path and an oil return path which are arranged in parallel, the hydraulic oil path is provided with a second throttling damper (111) and a pilot control valve (112) which are connected in series, an oil inlet of the pilot control valve (112) is connected with a second hydraulic source, the second hydraulic source has hydraulic oil with stable pressure, an oil return port of the pilot control valve (112) is connected with the oil return path, and the oil return path is provided with a third throttling damper (113).
8. The hydraulic quick-change device control circuit for an excavator according to claim 7 wherein the first hydraulic pressure source and the second hydraulic pressure source are the same hydraulic pressure source.
9. The hydraulic quick-change device control circuit for excavators according to claim 7, characterized in that the pilot control valve (112) is an electric proportional pressure reducing valve, an electrically controlled two-position three-way switching valve or a hydraulically controlled two-position three-way switching valve.
10. The hydraulic quick-change device control circuit for excavators according to claim 1, characterized by further comprising a hydraulic lock (12) for locking the rod chamber oil passage and the rodless chamber oil passage, respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123276302.6U CN216689565U (en) | 2021-12-23 | 2021-12-23 | Hydraulic quick-change device control loop for excavator |
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| CN202123276302.6U CN216689565U (en) | 2021-12-23 | 2021-12-23 | Hydraulic quick-change device control loop for excavator |
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