CN212297075U - Engineering machinery and hydraulic system - Google Patents
Engineering machinery and hydraulic system Download PDFInfo
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- CN212297075U CN212297075U CN202021225395.2U CN202021225395U CN212297075U CN 212297075 U CN212297075 U CN 212297075U CN 202021225395 U CN202021225395 U CN 202021225395U CN 212297075 U CN212297075 U CN 212297075U
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Abstract
The utility model discloses an engineering machine and a hydraulic system, wherein the hydraulic system comprises a hydraulic oil tank, a main pump, an auxiliary pump, a pilot oil source block, a multi-way valve and an actuating element; the oil outlet of the main pump is connected with the first oil inlet of the multi-way valve, the oil outlet of the auxiliary pump is connected with the second oil inlet of the multi-way valve, and the first oil inlet and the second oil inlet of the multi-way valve are communicated; the oil outlet of the main pump is connected with the oil inlet of the pilot oil source block, the oil outlet of the pilot oil source block is connected with the pilot oil port of the multi-way valve, and the oil return port of the pilot oil source block is communicated with the hydraulic oil tank; an electromagnetic valve is arranged in the pilot oil source block, the electromagnetic valve is electrified, a valve core of the electromagnetic valve is located at a first position, and an oil outlet of the pilot oil source block is communicated with an oil inlet of the pilot oil source block through the electromagnetic valve; when the electromagnetic valve is powered off, the valve core of the electromagnetic valve is positioned at the second position, and the oil outlet of the pilot oil source block is communicated to the oil return port of the pilot oil source block through the electromagnetic valve; the main pump and the auxiliary pump respectively comprise an electric control variable pump, a variable displacement mechanism, a displacement sensor and a pressure sensor.
Description
Technical Field
The utility model relates to an engineering machine tool, hydraulic system belong to engineering machine tool technical field.
Background
Along with the requirements of users on the working efficiency, the safety performance, the response speed, the energy consumption and the like of machine equipment are higher and higher. The system comprises a hydraulic system, a variable hydraulic system and a multi-way valve, wherein the hydraulic system is a main component of the engineering machinery, occupies most of power of the equipment, and is more and more energy-saving from an initial fixed-quantity hydraulic system to the variable hydraulic system, the efficiency is higher and higher. The improvement of hydraulic system power is limited by the power that the power source can provide, and hydraulic system lacks the real-time matching with the power source at present, leads to the make full use of power source power, gives play to maximum efficiency, also probably leads to the power source to become invalid because of system power is too big. The research on the energy conservation of the hydraulic system is limited to the improvement of the system principle, and has certain energy loss due to the insufficient utilization of hydraulic elements, particularly high-efficiency areas of pumps.
SUMMERY OF THE UTILITY MODEL
The purpose is as follows: in order to overcome the defects existing in the prior art, the utility model provides an engineering machine and a hydraulic system.
The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:
in a first aspect, a hydraulic system is provided, which includes a hydraulic oil tank, a main pump, an auxiliary pump, a pilot oil source block, a multi-way valve, and an actuating element;
the oil suction ports of the main pump and the auxiliary pump are respectively connected with a hydraulic oil tank; the main pump oil outlet is connected with a first oil inlet P1 of the multi-way valve, the auxiliary pump oil outlet is connected with a second oil inlet P2 of the multi-way valve, the first oil inlet P1 and the second oil inlet P2 of the multi-way valve are communicated in the multi-way valve, and each working port of the multi-way valve is respectively connected with a corresponding execution element;
the pilot oil source block is provided with an oil inlet P3, an oil outlet C and an oil return port T2, the oil outlet of a main pump is connected with the oil inlet P3 of the pilot oil source block, the oil outlet C of the pilot oil source block is connected with the pilot oil port PP of the multi-way valve, and the oil return port T2 of the pilot oil source block is communicated with a hydraulic oil tank;
an electromagnetic valve is arranged in the pilot oil source block, the electromagnetic valve is provided with a first position and a second position, the electromagnetic valve is electrified, a valve core of the electromagnetic valve is positioned at the first position, and an oil outlet C of the pilot oil source block is communicated with an oil inlet P3 of the pilot oil source block through the electromagnetic valve; when the electromagnetic valve is powered off, the valve core of the electromagnetic valve is positioned at the second position, and the oil outlet C of the pilot oil source block is communicated to the oil return port T2 of the pilot oil source block through the electromagnetic valve;
the main pump and the auxiliary pump respectively comprise an electric control variable pump, a variable displacement mechanism, a displacement sensor and a pressure sensor, the displacement sensor and the pressure sensor are installed at the outlet of the electric control variable pump, one end of the variable displacement mechanism is connected with the pressure sensor and used for receiving a pressure signal of the electric control variable pump, and the other end of the variable displacement mechanism is connected with a swash plate of the electric control variable pump and used for changing the displacement of the pump.
In some embodiments, the multi-way valve is a closed center multi-way valve or an open center multi-way valve, and the multi-way valve control adopts electro-hydraulic proportional control.
Further, the multi-way valve is provided with a first oil inlet P1, a second oil inlet P2, first working ports A1 and B1, second working ports A2 and B2, a pilot oil port PP, a return port T and an oil drain port D; the actuating elements comprise a first actuating element and a second actuating element;
the first working ports A1, B1 of the multiplex valve are in communication with the first actuator and the second working ports A2, B2 of the multiplex valve are in communication with the second actuator; and the return port T and the oil drainage port D are respectively connected with a hydraulic oil tank.
In some embodiments, the actuator is a hydraulic ram.
In some embodiments, the hydraulic system further comprises a main check valve, and the main pump oil outlet is connected with the first oil inlet P1 of the multi-way valve through the main check valve.
In some embodiments, the hydraulic system further comprises an auxiliary check valve, and the auxiliary pump oil outlet is connected with the second oil inlet P2 of the multi-way valve through the auxiliary check valve.
In some embodiments, the pilot oil source block further comprises a throttle valve, a filter, a pressure reducing valve, a check valve and an accumulator, oil in an oil inlet P3 of the pilot oil source block is sequentially stored in the accumulator through the throttle valve, the filter, the pressure reducing valve and the check valve, and then is communicated to an oil outlet C of the pilot oil source block through an electromagnetic valve, and the oil outlet C of the pilot oil source block is connected to an oil return port T2 through the electromagnetic valve; the pressure reducing valve is connected to the oil return port T2.
The control method of the hydraulic system comprises the following steps:
and when the system is operated, the total displacement is calculated according to an operation signal and the rotating speed of the power source, the total displacement is distributed to the main pump and the auxiliary pump according to a certain rule, and the output displacements of the main pump and the auxiliary pump are controlled to enable the main pump and the auxiliary pump to work in a high-efficiency area.
Further, the control method of the hydraulic system further includes:
acquiring actual pressure and actual flow of a main pump and an auxiliary pump;
calculating to obtain the total power of the hydraulic system according to the actual pressure and the actual flow of the main pump and the auxiliary pump; obtaining corresponding power source power according to the power source rotating speed;
comparing the total power of the hydraulic system with the power of a power source;
and responding to the ratio of the total power of the hydraulic system to the power source power exceeding a preset range, and correspondingly controlling to reduce the discharge capacity of the main pump and the auxiliary pump.
In another aspect, a working machine is provided, which comprises the above hydraulic system.
Has the advantages that: the utility model provides a hydraulic system, system adopt by the pump package fuel feeding, and guide's oil source piece provides the guide oil for the multiple unit valve, by signal of telecommunication simultaneous control multiple unit valve switching-over and pump package fuel feeding, realizes the execute component action. The size of a valve core opening of the multi-way valve and the size of oil supply of a pump set are controlled according to the size of an electric signal in the working process, the pump set coordinates the output of each pump according to system pressure and system flow, the high-efficiency area of the pump is fully utilized to work, the system pressure and the system flow are obtained by a pressure sensor arranged at the outlet of the pump, a displacement sensor and power source rotating speed information on the pump body are obtained, meanwhile, the total power of the hydraulic system can be calculated according to the system pressure and the system flow, the total power of the hydraulic system is compared with the power of a power source, whether the power source power occupies an overhigh or exceeds the high-efficiency working area of the power source. Has the following advantages:
on one hand, the speed of the actuating element is controlled by the output of the pump, the throttling loss of a quantitative system is avoided, the redundant flow of the quantitative system overflows through a valve core, the pressure loss of the valve core of a load-sensitive fully-variable system is avoided, the valve core of the load-sensitive fully-variable system needs to form a throttling to feed back to the pump for controlling the pump flow, and the system always has a pressure loss. A novel hydraulic system, provide the flow according to the system demand, and do not need the case throttle to produce feedback signal in order to control the pump flow, reduced energy loss. On the other hand, a pump group control mode is adopted, different flow control is distributed to different pumps, the efficient working area of each pump is fully utilized, and energy loss is reduced.
The efficiency is high, and the pump is integrated discharge capacity sensor, and pressure sensor combines power supply rotational speed information, but real time monitoring hydraulic system power, and the maximize utilizes power supply power, improves system work efficiency to prevent that hydraulic system power from surpassing power supply output, prevent that the power supply from becoming invalid.
The response is fast, the system controller directly controls the action of the pump and the multi-way valve at the same time, the multi-way valve is controlled to act relative to the load sensitive system controller, the multi-way valve feeds back a pump signal, the pump responds according to the feedback signal, the time for the feedback of the multi-way valve is saved, and the responsiveness is greatly improved.
In the safety design, the outlet of the pilot oil source block is provided with the electromagnetic valve, so that the pilot oil supply of the multi-way valve can be cut off, and potential safety hazards caused by misoperation can be effectively prevented.
Drawings
Fig. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a main pump in an embodiment;
FIG. 3 is a schematic diagram of an auxiliary pump in an embodiment;
FIG. 4 is a schematic diagram of a pilot oil source block in an embodiment;
in the figure: the hydraulic control system comprises a hydraulic oil tank 1, a main pump 2, an auxiliary pump 3, a main check valve 4, an auxiliary check valve 5, a pilot oil source block 6, a multi-way valve 7, an actuating element I8 and an actuating element II 9;
a first pump 21, a first displacement sensor 22, a first pressure sensor 23, a first displacement mechanism 24;
a second pump 31, a second displacement sensor 32, a second pressure sensor 33, a second displacement mechanism 34;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Example 1
As shown in fig. 1, a hydraulic system includes a hydraulic oil tank 1, a main pump 2, an auxiliary pump 3, a pilot oil source block 6, a multi-way valve 7, and an actuator;
the oil suction ports of the main pump 2 and the auxiliary pump 3 are respectively connected with a hydraulic oil tank 1; an oil outlet of the main pump 2 is connected with a first oil inlet P1 of the multi-way valve 7, an oil outlet of the auxiliary pump 3 is connected with a second oil inlet P2 of the multi-way valve 7, a first oil inlet P1 and a second oil inlet P2 of the multi-way valve 7 are communicated inside the multi-way valve 7, and all working ports of the multi-way valve 7 are respectively connected with corresponding execution elements;
as shown in fig. 1 and 4, the pilot oil source block 6 is provided with an oil inlet P3, an oil outlet C and an oil return port T2, the oil outlet of the main pump 2 is connected with the oil inlet P3 of the pilot oil source block 6, the oil outlet C of the pilot oil source block 6 is connected with the pilot oil port PP of the multi-way valve 7, and the oil return port T2 of the pilot oil source block 6 is communicated with the hydraulic oil tank 1;
the pilot oil source block 6 is internally provided with an electromagnetic valve 66, the electromagnetic valve 66 has a first position and a second position, the electromagnetic valve 66 is electrified, a valve core of the electromagnetic valve is positioned at the first position, and an oil outlet C of the pilot oil source block 6 is communicated with an oil inlet P3 of the pilot oil source block 6 through the electromagnetic valve 66; when the electromagnetic valve 66 is powered off, the valve core of the electromagnetic valve is positioned at the second position, and the oil outlet C of the pilot oil source block 6 is communicated to the oil return port T2 of the pilot oil source block 6 through the electromagnetic valve 66;
further, as shown in fig. 4, the pilot oil source block 6 further includes a throttle valve 61, a filter 62, a pressure reducing valve 63, a check valve 64, and an accumulator 65, the oil in the oil inlet P3 of the pilot oil source block 6 sequentially passes through the throttle valve 61, the filter 62, the pressure reducing valve 63, and the check valve 64 to be stored in the accumulator 65, and then is communicated to the oil outlet C of the pilot oil source block 6 through an electromagnetic valve 66, and the oil outlet C of the pilot oil source block 6 is connected to the oil return port T2 through the electromagnetic valve 66; the relief valve 63 is connected to the oil return port T2.
The main pump 2 and the auxiliary pump 3 respectively comprise an electric control variable pump, a variable displacement mechanism, a displacement sensor and a pressure sensor, the displacement sensor and the pressure sensor are installed at the outlet of the electric control variable pump, one end of the variable displacement mechanism is connected with the pressure sensor and used for receiving a pressure signal of the electric control variable pump, and the other end of the variable displacement mechanism is connected with a swash plate of the electric control variable pump and used for changing the displacement of the pump.
As shown in fig. 2, which is a schematic diagram of the interior of the main pump 2, the connection is as follows: the first displacement sensor 22 and the first pressure sensor 23 are installed at the outlet of the first pump 21, one end of the first displacement changing mechanism 24 is connected with the first pressure sensor 23 and used for receiving a pressure signal of the first pump 21, and the other end of the first displacement changing mechanism is connected with the swash plate of the first pump 21 to push the swash plate to act so as to achieve the purpose of changing the displacement of the pump, wherein the stronger the signal, the larger the displacement of the pump is.
Similarly, as shown in fig. 3, which is a schematic diagram of the interior of the auxiliary pump 3, the connection mode is as follows: the outlet of the second pump 31 is provided with a second displacement sensor 32 and a second pressure sensor 33, one end of a second displacement changing mechanism 34 is connected with the second pressure sensor 33 and used for receiving a pressure signal of the second pump 31, and the other end of the second displacement changing mechanism is connected with a swash plate of the second pump 31 to push the swash plate to act so as to achieve the purpose of changing the displacement of the pump, wherein the stronger the signal, the larger the displacement of the pump is.
In some embodiments, the multiway valve 7 is a closed center multiway valve or an open center multiway valve, and the multiway valve control adopts electro-hydraulic proportional control.
In some embodiments, the multi-way valve 7 has a first oil inlet P1, a second oil inlet P2, first working ports a1, B1 and second working ports a2, B2, a pilot oil port PP, a return port T, and an oil drain port D; the actuators comprise a first actuator 8 and a second actuator 9; the first working ports A1 and B1 of the multi-way valve 7 are respectively connected with the rodless cavity and the rod cavity of the first actuator 8, and the second working ports A2 and B2 of the multi-way valve 7 are respectively connected with the rodless cavity and the rod cavity of the second actuator 9; and the return port T and the oil drainage port D are respectively connected with the hydraulic oil tank 1.
In some embodiments, the actuator includes, but is not limited to, a hydraulic ram.
In some embodiments, the hydraulic system further comprises a main check valve 4, and an oil outlet of the main pump 2 is connected with the first oil inlet P1 of the multi-way valve 7 through the main check valve 4. The oil outlet of the auxiliary pump 3 is connected with a second oil inlet P2 of the multi-way valve 7 through the auxiliary one-way valve 5.
Example 2
The control method of the hydraulic system in the above embodiment includes:
and when the control is responded, the total displacement is calculated according to the control signal and the power source rotating speed, the total displacement is distributed to the main pump 2 and the auxiliary pump 3 according to a certain rule, and the output displacements of the main pump 2 and the auxiliary pump 3 are controlled, so that the main pump 2 and the auxiliary pump 3 are positioned in a high-efficiency area to work.
Further, the method also comprises the following steps:
acquiring actual pressure and actual flow of the main pump 2 and the auxiliary pump 3;
calculating to obtain the total power of the hydraulic system according to the actual pressure and the actual flow of the main pump 2 and the auxiliary pump 3; obtaining corresponding power source power according to the power source rotating speed;
comparing the total power of the hydraulic system with the power of a power source;
in response to the ratio of the total hydraulic system power to the power source power exceeding a preset range, the respective controls reduce the displacements of the main pump 2 and the auxiliary pump 3.
The device is started, when no operation is carried out, oil enters the main pump 2 and the auxiliary pump 3 from the hydraulic oil tank 1 and enters the multi-way valve 7 through the main check valve 4 and the auxiliary check valve 5 respectively, because no operation is carried out, the valve core of the multi-way valve 7 is located at a middle position, the oil from the main pump 2 and the auxiliary pump 3 is sealed at the inlet of the valve core, the pressure rises gradually, because no operation is carried out, the controller carries out pump displacement control according to the pressure of a pump port, the pump port is kept at standby pressure, the pump displacement is reduced when the pressure of the pump port is lower than the standby pressure, the pump displacement is increased when the pressure of the pump port is higher than the standby pressure, and the output. Meanwhile, a part of oil at the oil outlet of the main pump 2 enters the pilot oil source block 6, is stored in an energy accumulator 65 through a throttle valve 61, a filter 62, a pressure reducing valve 63 and a one-way valve 64 inside the pilot oil source block, and is communicated to a pilot oil port PP of the multi-way valve 7 through a built-in electromagnetic valve 66 of the pilot oil source block 6, so that pilot oil for driving a valve core to move is provided for the multi-way valve 7, and at the moment, the oil in the pilot oil source block 6 does not flow under the condition of no.
The electromagnetic valve 66 in the pilot oil source block 6 is controlled by an independent switch, when the electromagnetic valve 66 in the pilot oil source block 6 is electrified, the valve core works in an upper position, pilot oil in the pilot oil source block 6 can enter the multi-way valve 7, and when an operation signal is sent to the multi-way valve 7, the pilot oil enters a corresponding control cavity to drive the valve core to move. When the electromagnetic valve 66 in the pilot oil source block 6 is de-energized, the valve core is in the lower position to work, the pilot oil port PP of the multi-way valve 7 is communicated with the hydraulic oil tank 1 through the electromagnetic valve in the pilot oil source block 6, at this moment, even if an operation signal is given to the multi-way valve 7, no pilot oil exists, the valve core of the multi-way valve 7 cannot be reversed, and the first execution element or the second execution element does not act, so that the danger caused by misoperation is avoided.
Starting equipment, when an execution element I8 is operated, oil enters a main pump 2 and an auxiliary pump 3 from a hydraulic oil tank 1 and respectively enters a multi-way valve 7 through a main check valve 4 and an auxiliary check valve 5, due to operation, the multi-way valve 7 controls a valve core of the execution element I to be in a working position, the oil from the main pump 2 and the auxiliary pump 3 enters the execution element I through the valve core, the execution element I generates corresponding action, the oil flow depends on an operation signal, the flow is larger when the operation signal is larger, the flow is larger specifically in combination with the power source rotating speed, the corresponding total discharge capacity is calculated, and the total discharge capacity is distributed to the main pump 2 and the auxiliary pump 3 according to a certain rule. When the system pressure reaches a certain value along with the load change, the controller calculates the current system power through the first pressure sensor 23 and the first displacement sensor 22 of the main pump 2 and the second pressure sensor 33 and the second displacement sensor 32 of the auxiliary pump 3, and when the system power accounts for the power source power and exceeds a certain value or the power source is in failure risk, the displacements of the main pump 2 and the auxiliary pump 3 are correspondingly reduced until the program setting is met. The power of the power source is utilized to the maximum extent, the working efficiency of the system is improved, and the failure of the power source is avoided. When the second actuator 9 is operated, the system action is the same as that described above, and only the first actuator 8 needs to be replaced by the second actuator 9.
Example 3
In another aspect, a working machine is also provided, which comprises the hydraulic system.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (8)
1. A hydraulic system is characterized by comprising a hydraulic oil tank, a main pump, an auxiliary pump, a pilot oil source block, a multi-way valve and an actuating element;
the oil suction ports of the main pump and the auxiliary pump are respectively connected with a hydraulic oil tank; the main pump oil outlet is connected with a first oil inlet P1 of the multi-way valve, the auxiliary pump oil outlet is connected with a second oil inlet P2 of the multi-way valve, the first oil inlet P1 and the second oil inlet P2 of the multi-way valve are communicated in the multi-way valve, and each working port of the multi-way valve is respectively connected with a corresponding execution element;
the pilot oil source block is provided with an oil inlet P3, an oil outlet C and an oil return port T2, the oil outlet of a main pump is connected with the oil inlet P3 of the pilot oil source block, the oil outlet C of the pilot oil source block is connected with the pilot oil port PP of the multi-way valve, and the oil return port T2 of the pilot oil source block is communicated with a hydraulic oil tank;
an electromagnetic valve is arranged in the pilot oil source block, the electromagnetic valve is provided with a first position and a second position, the electromagnetic valve is electrified, a valve core of the electromagnetic valve is positioned at the first position, and an oil outlet C of the pilot oil source block is communicated with an oil inlet P3 of the pilot oil source block through the electromagnetic valve; when the electromagnetic valve is powered off, the valve core of the electromagnetic valve is positioned at the second position, and the oil outlet C of the pilot oil source block is communicated to the oil return port T2 of the pilot oil source block through the electromagnetic valve;
the main pump and the auxiliary pump respectively comprise an electric control variable pump, a variable displacement mechanism, a displacement sensor and a pressure sensor, the displacement sensor and the pressure sensor are installed at the outlet of the electric control variable pump, one end of the variable displacement mechanism is connected with the pressure sensor and used for receiving a pressure signal of the electric control variable pump, and the other end of the variable displacement mechanism is connected with a swash plate of the electric control variable pump and used for changing the displacement of the pump.
2. The hydraulic system as claimed in claim 1, wherein the multi-way valve is a closed center multi-way valve or an open center multi-way valve, and the multi-way valve is controlled by electro-hydraulic proportional control.
3. The hydraulic system of claim 1, wherein the multiplex valve has a first oil inlet P1, a second oil inlet P2, first and second working ports a1, B1, a second working port a2, B2, a pilot oil port PP, a return port T, and a drain port D; the actuating elements comprise a first actuating element and a second actuating element;
the first working ports A1, B1 of the multiplex valve are in communication with the first actuator and the second working ports A2, B2 of the multiplex valve are in communication with the second actuator; and the return port T and the oil drainage port D are respectively connected with a hydraulic oil tank.
4. The hydraulic system of claim 1, wherein the actuator is a hydraulic ram.
5. The hydraulic system as recited in claim 1 further comprising a main check valve, the main pump oil outlet being connected to the first oil inlet P1 of the multiplex valve through the main check valve.
6. The hydraulic system as claimed in claim 1, further comprising an auxiliary check valve, wherein the auxiliary pump outlet is connected to the second inlet port P2 of the multi-way valve through the auxiliary check valve.
7. The hydraulic system as claimed in claim 1, wherein the pilot oil source block further comprises a throttle valve, a filter, a pressure reducing valve, a check valve and an accumulator, wherein oil in an oil inlet P3 of the pilot oil source block sequentially passes through the throttle valve, the filter, the pressure reducing valve and the check valve to be stored in the accumulator and then is communicated to an oil outlet C of the pilot oil source block through a solenoid valve, and the oil outlet C of the pilot oil source block is connected to an oil return port T2 through the solenoid valve; the pressure reducing valve is connected to the oil return port T2.
8. A working machine, characterized in that it comprises a hydraulic system according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225395.2U CN212297075U (en) | 2020-06-29 | 2020-06-29 | Engineering machinery and hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225395.2U CN212297075U (en) | 2020-06-29 | 2020-06-29 | Engineering machinery and hydraulic system |
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| Publication Number | Publication Date |
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| CN212297075U true CN212297075U (en) | 2021-01-05 |
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| CN202021225395.2U Active CN212297075U (en) | 2020-06-29 | 2020-06-29 | Engineering machinery and hydraulic system |
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| CN (1) | CN212297075U (en) |
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2020
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