CN210595001U

CN210595001U - Super-lifting winch hydraulic system and crane

Info

Publication number: CN210595001U
Application number: CN201921759446.7U
Authority: CN
Inventors: 黎晓强; 黄志建; 杨尚峰
Original assignee: Sany Automobile Hoisting Machinery Co Ltd
Current assignee: Sany Automobile Hoisting Machinery Co Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-05-22
Anticipated expiration: 2029-10-18

Abstract

The utility model provides a super jack-up hydraulic system and hoist that raises up relates to hydraulic pressure jack-up technical field, the utility model provides a super jack-up hydraulic system that raises up includes: a hydraulic drive device and a proportional overflow device; the hydraulic driving device is provided with a first oil way and a second oil way, one of the first oil way and the second oil way is used for oil inlet of the hydraulic driving device, and the other oil way is used for oil outlet of the hydraulic driving device; one end of the proportional overflow device is communicated with the first oil way, and the other end of the proportional overflow device is communicated with the second oil way. The utility model provides a super lift up hydraulic system that rolls up has solved same proportion overflow device and can't adjust hydraulic technical problem under the two-way drive operating mode of hydraulic drive device respectively.

Description

Super-lifting winch hydraulic system and crane

Technical Field

The utility model belongs to the technical field of the hydraulic pressure jack-up technique and specifically relates to a super jack-up is rolled up hydraulic system and hoist.

Background

The crane adopts a mode of driving a motor hydraulically, and the hoisting equipment is driven by the hydraulic motor to hoist the heavy object. When the weight of the lifted object is large, if the driving pressure of the hydraulic motor is too large, the hoisting equipment is easily overloaded and damaged. The constant value overflow valve is additionally arranged in the oil supply oil way of the hydraulic motor, the overload of the oil supply pressure of the hydraulic motor is avoided through the constant value overflow valve, and although the function of safety pressure limiting can be achieved, the working pressure of the hoisting equipment is constant, and the constant value overflow valve cannot be matched with hoisted objects with different weights. In the rope-releasing working state, the hydraulic motor is driven by the gravity of the hoisted object. The back pressure required by the liquid outlet end of the hydraulic motor in the rope releasing state is different from the liquid supply pressure in the rope retracting state, and the same constant value overflow valve cannot respectively act on the two-way working state of the hydraulic motor and cannot respectively adjust the liquid pressure under the two-way working condition of the hydraulic motor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a super lift hydraulic system and hoist of raising to solve same proportion overflow device and can't adjust hydraulic technical problem under the two-way drive operating mode of hydraulic drive device respectively.

First aspect, the utility model provides a super lift hydraulic system that raises, include: a hydraulic drive device and a proportional overflow device; the hydraulic driving device is provided with a first oil path and a second oil path, one of the first oil path and the second oil path is used for oil inlet of the hydraulic driving device, and the other oil path is used for oil outlet of the hydraulic driving device; one end of the proportional overflow device is communicated with the first oil way, and the other end of the proportional overflow device is communicated with the second oil way.

In combination with the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the super-lift winch hydraulic system further includes a proportional reversing device, the proportional reversing device is provided with a first liquid port, a second liquid port, a third liquid port and a fourth liquid port, the first liquid port is in fluid communication with a liquid supply line, the second liquid port is in fluid communication with a liquid return line, the third liquid port is communicated with the first oil line, and the fourth liquid port is communicated with the second oil line; the proportional switching device has the following communication states: the first liquid port is communicated with the third liquid port, and the second liquid port is communicated with the fourth liquid port; or the first liquid port is communicated with the fourth liquid port, and the second liquid port is communicated with the third liquid port; the proportional reversing device is used for adjusting the opening degree of the proportional reversing device so as to change the flow velocity of liquid flow flowing through the proportional reversing device.

In combination with the first possible implementation manner of the first aspect, the utility model provides a second possible implementation manner of the first aspect, wherein, the super-lift winch hydraulic system further includes a compensation valve, the first valve port of the compensation valve communicates with the first fluid port, the third fluid port with the fourth fluid port communicates with the second valve port of the compensation valve respectively.

In combination with the first possible implementation manner of the first aspect, the utility model provides a third possible implementation manner of the first aspect, wherein the super-lift winch hydraulic system further includes a constant value reversing device, the constant value reversing device is provided with a fifth liquid port, a sixth liquid port, a seventh liquid port and an eighth liquid port, the fifth liquid port is in fluid communication with the liquid supply pipeline, the sixth liquid port is in fluid communication with the liquid return pipeline, the seventh liquid port is communicated with the first oil circuit, and the eighth liquid port is communicated with the second oil circuit; the constant value reversing device has the following communication states: the fifth liquid port is communicated with the seventh liquid port, and the sixth liquid port is communicated with the eighth liquid port; or the fifth liquid port is communicated with the eighth liquid port, and the sixth liquid port is communicated with the seventh liquid port.

With reference to the first aspect, the present invention provides a fourth possible implementation manner of the first aspect, wherein when oil flows into the hydraulic driving device through the second oil path and is discharged through the first oil path, the hydraulic driving device is configured to drive a load to move; when the load reversely drives the hydraulic driving device, oil flows into the hydraulic driving device through the first oil way and is discharged through the second oil way; and a check valve is arranged between the first oil way and the liquid return pipeline and is used for blocking the oil in the first oil way from flowing into the liquid return pipeline.

In combination with the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein the proportional overflow device is connected in parallel with a constant overflow valve.

Combine the third possible implementation mode of the first aspect, the utility model provides a sixth possible implementation mode of the first aspect, wherein, super lift hydraulic system of raising up still includes balanced valve, the oil pressure signal mouth intercommunication of balanced valve first oil circuit, the first working fluid port intercommunication of balanced valve the second oil circuit, the second working fluid port of balanced valve with return liquid pipeline fluid intercommunication.

In combination with the sixth possible implementation manner of the first aspect, the utility model provides a seventh possible implementation manner of the first aspect, wherein the fourth fluid port and the eighth fluid port communicate with the second working oil port of the balance valve respectively.

Second aspect, the utility model provides a hoist is equipped with the super lift winch hydraulic system that the first aspect provided.

The embodiment of the utility model provides a following beneficial effect has been brought: the hydraulic driving device is provided with a first oil path and a second oil path, one of the first oil path and the second oil path is used for oil inlet of the hydraulic driving device, the other oil path is used for oil outlet of the hydraulic driving device, one end of the proportional overflow device is communicated with the first oil path, and the other end of the proportional overflow device is communicated with the second oil path. In a hoisting state, the oil supply pressure of the hydraulic driving device can be adjusted through pressure limiting of the proportional overflow device; when the weight is in a descending state, the pressure is limited by the proportional overflow device, and back pressure can be formed at the oil outlet end of the hydraulic driving device. Under the two-way driving working condition of the hydraulic driving device, the overflow devices with the same proportion can play a role in adjusting hydraulic pressure.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or the related art, the drawings required to be used in the description of the embodiments or the related art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of a super-lift winch hydraulic system provided by an embodiment of the present invention.

Icon: 001-a liquid supply line; 002-a liquid return pipeline; 100-a hydraulic drive device; 110-a first oil path; 120-a second oil path; 200-proportional overflow device; 300-proportional reversing device; 301-a first fluid port; 302-a second fluid port; 303-third fluid port; 304-a fourth fluid port; 400-a compensation valve; 500-constant value commutation device; 501-a fifth liquid port; 502-sixth fluid port; 503-a seventh port; 504-eighth port; 600-a one-way valve; 700-constant value overflow valve; 800-balance valve.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in FIG. 1, the embodiment of the utility model provides a super lift hydraulic system, include: a hydraulic drive means 100 and a proportional overflow means 200; the hydraulic driving device 100 is provided with a first oil path 110 and a second oil path 120, one of the first oil path 110 and the second oil path 120 is used for feeding oil into the hydraulic driving device 100, and the other oil path is used for discharging oil from the hydraulic driving device 100; one end of the proportional overflow device 200 is communicated with the first oil path 110, and the other end of the proportional overflow device 200 is communicated with the second oil path 120.

When oil enters the second oil path 120 and returns to the first oil path 110, the oil drives the hydraulic driving device 100 to lift a heavy object, the proportional overflow device 200 and the hydraulic driving device 100 are in a parallel connection relationship, and part of the oil at the oil inlet end of the hydraulic driving device 100 is shunted by the proportional overflow device 200 and flows into the second oil path 120. At this time, the set pressure of the proportional relief device 200 is adjusted to change the hydraulic pressure in the second oil passage 120, thereby adjusting the driving force of the hydraulic drive device 100.

When the hydraulic driving device 100 is driven by heavy objects in a reverse direction, the first oil path 110 is filled with oil, the second oil path 120 is filled with oil, part of the oil discharged through the second oil path 120 flows through the proportional overflow device 200 and flows into the first oil path 110, so that the oil is supplemented to the hydraulic driving device 100, and the sufficient oil supply of the hydraulic driving device 100 can be ensured when the steel wire rope is released at a high speed. In addition, the proportional relief device 200 has the function of adjusting the oil pressure of the second oil path 120, so that a back pressure can be formed at the oil return end of the hydraulic drive device 100, and the steel wire rope is always in a tensioned state in the process of descending the heavy object.

In the embodiment of the present invention, the super-lift winch hydraulic system further includes a proportional reversing device 300, the proportional reversing device 300 is provided with a first liquid port 301, a second liquid port 302, a third liquid port 303 and a fourth liquid port 304, the first liquid port 301 is in fluid communication with the liquid supply line 001, the second liquid port 302 is in fluid communication with the liquid return line 002, the third liquid port 303 is in communication with the first oil path 110, and the fourth liquid port 304 is in communication with the second oil path 120; the proportional switching device 300 has the following connected states: in the first state, the first liquid port 301 is communicated with the third liquid port 303, and the second liquid port 302 is communicated with the fourth liquid port 304; in the second state, the first liquid port 301 is communicated with the fourth liquid port 304, and the second liquid port 302 is communicated with the third liquid port 303; the proportional reversing device 300 is used to adjust its own opening to vary the flow rate of the fluid flowing through the proportional reversing device 300. The hydraulic driving device 100 comprises a bidirectional hydraulic motor, the proportional overflow device 200 comprises a proportional overflow valve, the proportional reversing device 300 comprises a proportional reversing valve, and the hydraulic driving device 100, the proportional overflow device 200 and the proportional reversing device 300 can be replaced by other equivalent devices respectively.

Specifically, under the state two working conditions, the oil pump inputs oil into the second oil passage 120 through the liquid supply pipeline 001, and the proportional overflow device 200 regulates the driving force of the hydraulic driving device 100 by limiting and shunting. The oil flowing through the hydraulic driving device 100 sequentially flows through the first oil path 110 and the proportional reversing device 300 and flows into the liquid return pipeline 002, and the hydraulic driving device 100 works under the driving of the oil, so that the winding equipment is driven to wind a rope, and further, a heavy object is lifted. Under the condition of the state one, the heavy object reversely drives the hydraulic driving device 100, the oil flows out through the second oil path 120, a part of the oil flows through the proportional overflow device 200 and enters the first oil path 110, and the other part of the oil flows through the proportional reversing device 300 and enters the liquid return pipeline 002. The proportional relief device 200 can enable the oil return end of the hydraulic drive device 100 to form back pressure, and can enable part of oil to flow into the first oil path 110, so as to ensure that the hydraulic drive device 100 is sufficiently supplied with oil.

Further, the super-lift winch hydraulic system further comprises a compensation valve 400, a first valve port of the compensation valve 400 is communicated with the first fluid port 301, and the third fluid port 303 and the fourth fluid port 304 are respectively communicated with a second valve port of the compensation valve 400. The compensating valve 400 can compensate the pressure between the inlet end and the outlet end of the proportional reversing device 300, and when the hydraulic driving device 100 runs at a low speed, the flow rate of the oil flowing through the proportional reversing device 300 is not affected by the load.

Further, the super-lift winch hydraulic system further comprises a fixed value reversing device 500, the fixed value reversing device 500 is provided with a fifth liquid port 501, a sixth liquid port 502, a seventh liquid port 503 and an eighth liquid port 504, the fifth liquid port 501 is in fluid communication with a liquid supply pipeline 001, the sixth liquid port 502 is in fluid communication with a liquid return pipeline 002, the seventh liquid port 503 is communicated with the first oil way 110, and the eighth liquid port 504 is communicated with the second oil way 120; the constant value commutation device 500 has the following communication states: in the first state, the fifth liquid port 501 is communicated with the seventh liquid port 503, and the sixth liquid port 502 is communicated with the eighth liquid port 504; in the second state, the fifth port 501 communicates with the eighth port 504, and the sixth port 502 communicates with the seventh port 503.

Specifically, the fixed-value reversing device 500 is connected in parallel with the proportional reversing device 300, and when the fixed-value reversing device 500 is turned on, the hydraulic drive device 100 operates at a first speed; when the proportional reversing device 300 is on, the hydraulic drive device 100 operates at a second speed, and the second speed is less than the first speed; when the constant value commutation device 500 and the proportional commutation device 300 are turned on simultaneously, that is: the constant value reversing device 500 and the proportional reversing device 300 are both in the second state, the hydraulic driving device 100 runs at the third speed, and a heavy object is hoisted; alternatively, the fixed-value reversing device 500 and the proportional reversing device 300 are both in state one, and the hydraulic drive device 100 is operated in a fourth motion, at which time the weight falls. The third speed and the fourth speed are both greater than the first speed, and the flow rate of oil in the system can be increased by simultaneously starting the constant value reversing device 500 and the proportional reversing device 300, so that the running speed of the hydraulic drive device 100 is increased. In addition, adjusting the proportional reversing device 300 can adjust the oil flow rate in the hydraulic drive device 100, thereby adjusting the super-lift windup speed.

Further, when the oil flows into the hydraulic drive device 100 through the second oil passage 120 and is discharged through the first oil passage 110, the hydraulic drive device 100 is used to drive the load to move; when the hydraulic drive device 100 is driven in the reverse direction by a load, the oil flows into the hydraulic drive device 100 through the first oil passage 110 and is discharged through the second oil passage 120; a check valve 600 is arranged between the first oil path 110 and the liquid return line 002, and the check valve 600 is used for blocking the oil liquid in the first oil path 110 from flowing into the liquid return line 002. When the oil flows into the hydraulic drive device 100 through the second oil passage 120 and is discharged through the first oil passage 110, the oil flows from the first oil passage 110 through the third port 303 and the second port 302 and enters the return line 002; when the oil flows into the hydraulic drive device 100 through the first oil passage 110 and is discharged through the second oil passage 120, the oil enters the liquid return line 002 through the fourth port 304 and the second port 302, and the oil in the liquid return line 002 flows into the first oil passage 110 through the check valve 600. When the heavy object drives the hydraulic driving device 100 to operate at a high speed, the check valve 600 is opened, and the oil in the return pipe 002 flows into the first oil passage 110 through the check valve 600, so that sufficient oil supply of the hydraulic driving device 100 can be ensured.

Further, the proportional relief device 200 is connected in parallel with a constant relief valve 700. The constant relief valve 700 is used in combination with the proportional relief device 200, and the oil pressure is finely adjusted by the proportional relief device 200, so that the driving pressure of the hydraulic driving device 100 can be more accurately adjusted.

Further, the super-lift winch hydraulic system further comprises a balance valve 800, an oil pressure signal port of the balance valve 800 is communicated with the first oil path 110, a first working oil port of the balance valve 800 is communicated with the second oil path 120, and a second working oil port of the balance valve 800 is in fluid communication with the liquid return pipeline 002. The oil pressure of the first oil passage 110 and the oil pressure of the second oil passage 120 are balanced by the balance valve 800, so that the hydraulic drive device 100 can be locked. When the hydraulic driving device 100 is driven by the heavy object in the reverse direction, the oil return speed of the hydraulic driving device 100 can be adjusted by adjusting the opening degree of the balance valve 800, and then the rope releasing speed is adjusted to ensure that the steel wire rope is in a tensioning state in the descending process of the heavy object.

Further, the fourth fluid port 304 and the eighth fluid port 504 are respectively communicated with a second working fluid port of the balance valve 800. When the rope is rapidly retracted, oil in the liquid supply pipeline 001 flows into the balance valve 800 through the fourth liquid port 304 and the eighth liquid port 504 respectively, part of the oil flowing through the balance valve 800 flows into the hydraulic drive device 100, and the other part of the oil flows into the proportional overflow device 200 and the fixed-value overflow valve 700. When the rope is released, the oil flows into the hydraulic drive device 100 through the first oil path 110 and flows out through the second oil path 120, part of the oil flows through the proportional overflow device 200 and the constant overflow valve 700 and enters the first oil path 110, and the other part of the oil flows into the return pipeline 002 through the fourth port 304 or the eighth port 504.

Example two

As shown in fig. 1, the crane provided by the embodiment of the present invention is provided with the super-lift winch hydraulic system provided by the first embodiment.

Specifically, the hydraulic driving device 100 adopts a bidirectional hydraulic motor, the bidirectional hydraulic motor is in transmission connection with the rope winding device, and the rope winding device can be driven to wind or release a steel wire rope through the hydraulic driving device 100, so that a heavy object is lifted or dropped. The technical effect of the crane provided in this embodiment is the same as that of the super-lift winch hydraulic system provided in the first embodiment, and therefore, the description thereof is omitted.

The super-lift winch control method adopts the super-lift winch hydraulic system provided by the first embodiment, and comprises the following steps: a first oil way 110 and a second oil way 120 are selected to supply oil to the hydraulic driving device 100 alternatively, and the hydraulic driving device 100 returns oil through the other oil way; the proportional relief device 200 is adjusted to adjust the oil supply pressure or the oil discharge pressure of the hydraulic drive device 100.

When the rope is retracted at a medium speed, the fifth liquid port 501 is communicated with the eighth liquid port 504, the sixth liquid port 502 is communicated with the seventh liquid port 503, and oil in the liquid supply pipeline 001 flows into the hydraulic drive device 100 through the fifth liquid port 501, the eighth liquid port 504 and the balance valve 800 and flows into the liquid return pipeline 002 through the first oil way 110, the seventh liquid port 503 and the sixth liquid port 502. When the rope is unwound at a medium speed, the fifth liquid port 501 is communicated with the seventh liquid port 503, the sixth liquid port 502 is communicated with the eighth liquid port 504, oil liquid in the liquid supply pipeline 001 flows into the hydraulic driving device 100 through the fifth liquid port 501, the seventh liquid port 503 and the first oil channel 110, and the oil liquid in the hydraulic driving device 100 flows back to the liquid return pipeline 002 through the second oil channel 120, the balance valve 800, the eighth liquid port 504 and the sixth liquid port 502. When the rope is quickly collected or put away, the fixed value reversing device 500 is started, and the proportional reversing device 300 is started, that is: the fifth liquid port 501 is communicated with the eighth liquid port 504, the sixth liquid port 502 is communicated with the seventh liquid port 503, the first liquid port 301 is communicated with the fourth liquid port 304, and the second liquid port 302 is communicated with the third liquid port 303; alternatively, the fifth port 501 communicates with the seventh port 503, the sixth port 502 communicates with the eighth port 504, the first port 301 communicates with the third port 303, and the second port 302 communicates with the fourth port 304. The proportional reversing device 300 and the fixed-value reversing device 500 are simultaneously started, so that the oil inlet flow rate and the oil return flow rate of the hydraulic driving device 100 are increased, and the running speed of the hydraulic driving device 100 is further increased. The maximum opening degree of the proportional reversing device 300 is smaller than that of the constant value reversing device 500, the proportional reversing device 300 has higher precision, and when the proportional reversing device 300 and the constant value reversing device 500 are simultaneously opened, the running speed of the hydraulic driving device 100 can be accurately regulated by regulating the proportional reversing device 300, so that the hoisting speed is regulated. When the rope is reeled in or reeled out at a low speed, only the proportional reversing device 300 is started, so that the oil flows through the hydraulic driving device 100 at a low flow speed, and the hoisting operation can be carried out at a low speed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A super-lift winch hydraulic system is characterized by comprising: a hydraulic drive means (100) and a proportional overflow means (200);

the hydraulic driving device (100) is provided with a first oil path (110) and a second oil path (120), one of the first oil path (110) and the second oil path (120) is used for feeding oil into the hydraulic driving device (100), and the other oil path is used for discharging oil from the hydraulic driving device (100);

one end of the proportional overflow device (200) is communicated with the first oil path (110), and the other end of the proportional overflow device (200) is communicated with the second oil path (120).

2. A super-lift winch hydraulic system according to claim 1, characterized in that the super-lift winch hydraulic system further comprises a proportional reversing device (300), the proportional reversing device (300) is provided with a first liquid port (301), a second liquid port (302), a third liquid port (303) and a fourth liquid port (304), the first liquid port (301) is in fluid communication with a liquid supply pipeline (001), the second liquid port (302) is in fluid communication with a liquid return pipeline (002), the third liquid port (303) is in communication with the first oil path (110), and the fourth liquid port (304) is in communication with the second oil path (120);

the proportional switching device (300) has the following communication states:

the first liquid port (301) is communicated with the third liquid port (303), and the second liquid port (302) is communicated with the fourth liquid port (304);

or the first liquid port (301) is communicated with the fourth liquid port (304), and the second liquid port (302) is communicated with the third liquid port (303);

the proportional reversing device (300) is used for adjusting the opening degree of the proportional reversing device to change the flow speed of liquid flow flowing through the proportional reversing device (300).

3. A super-lift winch hydraulic system according to claim 2, characterized in that the super-lift winch hydraulic system further comprises a compensation valve (400), wherein a first port of the compensation valve (400) is communicated with the first fluid port (301), and the third fluid port (303) and the fourth fluid port (304) are respectively communicated with a second port of the compensation valve (400).

4. A super-lift winch hydraulic system according to claim 2, characterized in that the super-lift winch hydraulic system further comprises a constant value reversing device (500), the constant value reversing device (500) is provided with a fifth liquid port (501), a sixth liquid port (502), a seventh liquid port (503) and an eighth liquid port (504), the fifth liquid port (501) is in fluid communication with the liquid supply pipeline (001), the sixth liquid port (502) is in fluid communication with the liquid return pipeline (002), the seventh liquid port (503) is communicated with the first oil path (110), and the eighth liquid port (504) is communicated with the second oil path (120);

the constant value commutation device (500) has the following communication states:

the fifth liquid port (501) is communicated with the seventh liquid port (503), and the sixth liquid port (502) is communicated with the eighth liquid port (504);

alternatively, the fifth liquid port (501) is communicated with the eighth liquid port (504), and the sixth liquid port (502) is communicated with the seventh liquid port (503).

5. A super-lift winch hydraulic system according to claim 1, wherein the hydraulic drive device (100) is adapted to drive the movement of a load when oil flows into the hydraulic drive device (100) through the second oil passage (120) and is discharged through the first oil passage (110);

when the load reversely drives the hydraulic drive device (100), oil flows into the hydraulic drive device (100) through the first oil passage (110) and is discharged through the second oil passage (120);

a check valve (600) is arranged between the first oil way (110) and the liquid return pipeline (002), and the check valve (600) is used for blocking oil in the first oil way (110) from flowing into the liquid return pipeline (002).

6. A super-lift winch hydraulic system according to claim 1, characterized in that the proportional overflow device (200) is connected in parallel with a constant overflow valve (700).

7. A super-lift winch hydraulic system according to claim 4, characterized in that the super-lift winch hydraulic system further comprises a balance valve (800), the oil pressure signal port of the balance valve (800) is communicated with the first oil path (110), the first working oil port of the balance valve (800) is communicated with the second oil path (120), and the second working oil port of the balance valve (800) is in fluid communication with the liquid return line (002).

8. A super-lift winch hydraulic system according to claim 7, characterized in that the fourth (304) and eighth (504) fluid ports communicate with the second working fluid port of the balancing valve (800), respectively.

9. A super-lift winch hydraulic system according to claim 7, characterized in that the proportional relief means (200) comprises a proportional relief valve.

10. A crane, characterized in that the crane is provided with a superlift winch hydraulic system according to any one of claims 1 to 9.