阅读说明：本技术 一种起升液压系统 (Lifting hydraulic system ) 是由 王进峰 陆兆鹏 叶凯 刘鑫胜 于 2021-07-05 设计创作，主要内容包括：一种起升液压系统,包括马达、平衡阀、第一换向阀、第一梭阀、第二换向阀、第一单向阀、第二梭阀、电磁换向阀、绞车组件、系统第一工作油口和系统第二工作油口,系统第一工作油口依次通过平衡阀、马达与系统第二工作油口相连通,第一梭阀依次通过第二换向阀、第二梭阀与绞车组件相连接,第一换向阀通过电磁换向阀与3MPa恒压油源相连通,本设计在当出现紧急情况时电磁换向阀的线圈得电可使第一换向阀的控制油口与3MPa恒压油源相连通,进而使马达在负载的牵引下自由转动,同时压绳装置打开实现自动弃绳。(A lifting hydraulic system comprises a motor, a balance valve, a first reversing valve, a first shuttle valve, a second reversing valve, a first one-way valve, a second shuttle valve, an electromagnetic reversing valve, a winch assembly, a first system working oil port and a second system working oil port, wherein the first system working oil port sequentially passes through the balance valve, the motor is communicated with the second system working oil port, the first shuttle valve sequentially passes through the second reversing valve and the second shuttle valve and is connected with the winch assembly, the first reversing valve is communicated with a 3MPa constant-pressure oil source through the electromagnetic reversing valve, and in the design, when an emergency occurs, a coil of the electromagnetic reversing valve is electrified, so that the control oil port of the first reversing valve is communicated with the 3MPa constant-pressure oil source, the motor can freely rotate under the traction of a load, and meanwhile, a rope pressing device is opened to realize automatic rope abandoning.)

1. A play to rise hydraulic system which characterized in that:

the lifting hydraulic system comprises a motor (1), a balance valve (2), a first reversing valve (3), a first shuttle valve (4), a second reversing valve (5), a first one-way valve (6), a second shuttle valve (7), an electromagnetic reversing valve (8), a winch assembly (9), a system first working oil port (A) and a system second working oil port (B);

the system comprises a first working oil port (A) of the system, a second working oil port (B) of the system, a control oil port of a balance valve (2) and an oil inlet of a first shuttle valve (4), wherein the first working oil port (A) of the system is communicated with a working oil port of a motor (1) through a balance valve (2), the second working oil port of the motor (1) is communicated with a second working oil port (B) of the system, the second working oil port (B) of the system is simultaneously communicated with a control oil port of the balance valve (2) and an oil inlet of the first shuttle valve (4), the other oil inlet of the first shuttle valve (4) is communicated with a first working oil port (A) of the system, the oil outlet of the first shuttle valve (4) is communicated with a control oil port of a second reversing valve (5), the oil inlet of the second reversing valve (5) is communicated with the oil outlet of a first one-way valve (6), the oil inlet of the first one-way valve (6) is communicated with a 3MPa constant pressure oil source (12), the oil outlet of the second reversing valve (5) is communicated with an oil tank, the other oil outlet of the second reversing valve (5) is communicated with an oil inlet of a second shuttle valve (7), the other oil inlet of the second shuttle valve (7) is communicated with an oil outlet of the electromagnetic directional valve (8), a working oil port of the electromagnetic directional valve (8) is communicated with an oil tank, and an oil inlet of the electromagnetic directional valve (8) is communicated with a 3MPa constant pressure oil source 12;

a control oil port of the first reversing valve (3) is communicated with an oil outlet of the electromagnetic reversing valve (8), and two working oil ports of the first reversing valve (3) are respectively communicated with two working oil ports of the motor (1);

the winch assembly (9) comprises a disc brake (91), a belt brake (92), a roller (93), a rope pressing device (94) and a pull rope (95), a rotating shaft of the roller (93) is in transmission fit with an output shaft of the motor (1), the disc brake (91) is arranged at one end, close to the motor (1), of the rotating shaft of the roller (93), and the belt brake (92) is arranged at one end, far away from the motor (1), of the rotating shaft of the roller (9);

the control end of the disc brake (91) is communicated with the oil outlet of the second shuttle valve (7), and the braking end of the disc brake (91) is matched with the rotating shaft of the roller (93); the control end of the belt brake (92) is communicated with the oil outlet of the second shuttle valve (7), and the brake end of the belt brake (92) is matched with the rotating shaft of the roller (93);

one end of the pull rope (95) is fixed on the roller (93) through a rope pressing device (94), the other end of the pull rope (95) is provided with a hook (96), and the control end of the rope pressing device (94) is communicated with the control oil port of the first reversing valve (3).

2. A lifting hydraulic system as claimed in claim 1, wherein:

the lifting hydraulic system further comprises a pilot-operated proportional overflow valve (10) and a two-way cartridge valve (11), wherein an oil outlet of the pilot-operated proportional overflow valve (10) is communicated with an oil tank, an oil inlet of the pilot-operated proportional overflow valve (10) is communicated with a control oil port of the two-way cartridge valve (11), an oil inlet of the two-way cartridge valve (11) is communicated with an oil way between the motor (1) and the balance valve (2), and an oil outlet of the two-way cartridge valve (11) is communicated with a second working oil port (B) of the system.

3. A lifting hydraulic system as claimed in claim 2, wherein:

the lifting hydraulic system further comprises a one-way overflow valve (13), an oil inlet of the one-way overflow valve (13) is communicated with an oil inlet of the two-way cartridge valve (11), and an oil outlet of the one-way overflow valve (13) is communicated with an oil tank.

4. A lifting hydraulic system as claimed in claim 3, wherein:

a first pressure measuring joint (MA) communicated with the first working oil port (A) of the system is arranged at the first working oil port (A), and a second pressure measuring joint (MB) communicated with the second working oil port (B) of the system is arranged at the second working oil port (B).

5. A lifting hydraulic system as claimed in any one of claims 1 to 4, wherein:

the lifting hydraulic system further comprises an oil supplementing one-way valve (14), an oil inlet of the oil supplementing one-way valve (14) is communicated with an oil tank, and an oil outlet of the oil supplementing one-way valve (14) is communicated with an oil path between an oil outlet of the two-way cartridge valve (11) and a second working oil port (B) of the system;

and a filter screen (15) is arranged at the control oil port of the balance valve (2).

6. A lifting hydraulic system as claimed in claim 5, wherein:

one end of the pull rope (95) is fixed on the roller (93), the other end of the pull rope (95) passes through the guide pulley (16) and then is connected with the hook (96), and the middle part of the guide pulley (16) is provided with the pin shaft sensor (17).

7. A lifting hydraulic system as claimed in claim 6, wherein:

a first one-way throttle valve (18) is arranged on an oil path between an oil outlet of the second shuttle valve (7) and a control end of the disc brake (91);

and a second one-way throttle valve (19) is arranged on an oil path between the oil outlet of the second shuttle valve (7) and the control end of the belt brake (92).

8. A lifting hydraulic system as claimed in claim 7, wherein:

and a throttle valve (31) is arranged at one working oil port of the first reversing valve (3).

Technical Field

The invention relates to a hydraulic system, in particular to a lifting hydraulic system, which is particularly suitable for lifting and hoisting operation of a fixed platform and a supply ship.

Background

The lifting hydraulic system is widely applied to various lifting devices. The lifting hydraulic system in the prior art can only realize lifting and lowering of goods generally, however, when a fixed platform crane is in lifting operation with a supply ship, if a hook of the fixed platform crane is inadvertently hooked on the supply ship, and the supply ship starts to move unconsciously or is uncontrollable in state, if a pull rope cannot be separated from lifting equipment rapidly, an accident that the crane or the whole platform is dragged down by the supply ship can occur, and serious potential safety hazards are caused.

Therefore, a lifting hydraulic system is needed, wherein the tension of the pull rope is controllable, and the lifting hydraulic system can realize that the lifting platform is separated from the supply ship by actively abandoning the rope in an emergency.

Disclosure of Invention

The invention aims to solve the problem that hoisting equipment is dragged down by a supply ship when a lifting hook of a fixed platform crane is inadvertently hung on the supply ship in the hoisting operation with the supply ship in the prior art, and provides a lifting hydraulic system more suitable for an offshore supply platform.

In order to achieve the above purpose, the technical solution of the invention is as follows:

a lifting hydraulic system comprises a motor, a balance valve, a first reversing valve, a first shuttle valve, a second reversing valve, a first one-way valve, a second shuttle valve, an electromagnetic reversing valve, a winch assembly, a first system working oil port and a second system working oil port;

the system comprises a first working oil port of a motor, a second working oil port of the motor, a control oil port of a balance valve and an oil inlet of a first shuttle valve, wherein the first working oil port of the motor is communicated with the second working oil port of the system through the balance valve, the second working oil port of the system is communicated with the control oil port of the balance valve and the oil inlet of the first shuttle valve at the same time, the other oil inlet of the first shuttle valve is communicated with the first working oil port of the system, the oil outlet of the first shuttle valve is communicated with the control oil port of the second reversing valve, the oil inlet of the second reversing valve is communicated with the oil outlet of the first check valve, the oil inlet of the first check valve is communicated with a 3MPa constant pressure oil source, the oil outlet of the second reversing valve is communicated with an oil tank, the other oil outlet of the second reversing valve is communicated with the oil inlet of the second shuttle valve, and the other oil inlet of the second shuttle valve is communicated with the oil outlet of the electromagnetic reversing valve, the working oil port of the electromagnetic directional valve is communicated with an oil tank, and the oil inlet of the electromagnetic directional valve is communicated with a 3MPa constant-pressure oil source;

a control oil port of the first reversing valve is communicated with an oil outlet of the electromagnetic reversing valve, and two working oil ports of the first reversing valve are respectively communicated with two working oil ports of the motor;

the winch assembly comprises a disc brake, a belt brake, a roller, a rope pressing device and a pull rope, wherein a rotating shaft of the roller is in transmission fit with an output shaft of a motor, the disc brake is arranged at one end, close to the motor, of the rotating shaft of the roller, and the belt brake is arranged at one end, far away from the motor, of the rotating shaft of the roller;

the control end of the disc brake is communicated with the oil outlet of the second shuttle valve, and the braking end of the disc brake is matched with the rotating shaft of the roller; the control end of the belt brake is communicated with the oil outlet of the second shuttle valve, and the braking end of the belt brake is matched with the rotating shaft of the roller;

one end of the pull rope is fixed on the roller through a rope pressing device, the other end of the pull rope is provided with a hook, and the control end of the rope pressing device is communicated with the control oil port of the first reversing valve.

The lifting hydraulic system further comprises a pilot-operated proportional overflow valve and a two-way cartridge valve, wherein an oil outlet of the pilot-operated proportional overflow valve is communicated with an oil tank, an oil inlet of the pilot-operated proportional overflow valve is communicated with a control oil port of the two-way cartridge valve, an oil inlet of the two-way cartridge valve is communicated with an oil path between the motor and the balance valve, and an oil outlet of the two-way cartridge valve is communicated with a second working oil port of the system.

The lifting hydraulic system further comprises a one-way overflow valve, an oil inlet of the one-way overflow valve is communicated with an oil inlet of the two-way cartridge valve, and an oil outlet of the one-way overflow valve is communicated with the oil tank.

And a first pressure measuring joint communicated with the first working oil port is arranged at the first working oil port of the system, and a second pressure measuring joint communicated with the second working oil port of the system is arranged at the second working oil port of the system.

The lifting hydraulic system further comprises an oil supplementing one-way valve, an oil inlet of the oil supplementing one-way valve is communicated with an oil tank, and an oil outlet of the oil supplementing one-way valve is communicated with an oil path between an oil outlet of the two-way cartridge valve and a second working oil port of the system;

and a filter screen is arranged at the control oil port of the balance valve.

One end of the pull rope is fixed on the roller, the other end of the pull rope is connected with the hook after passing through the guide pulley, and the middle part of the guide pulley is provided with the pin shaft sensor.

A first one-way throttle valve is arranged on an oil path between an oil outlet of the second shuttle valve and a control end of the disc brake;

and a second one-way throttle valve is arranged on an oil path between the oil outlet of the second shuttle valve and the control end of the belt brake.

And a throttle valve is arranged at one working oil port of the first reversing valve.

Compared with the prior art, the invention has the beneficial effects that:

1. two working oil ports of a first reversing valve in the lifting hydraulic system are respectively communicated with two working oil ports of a motor, when a hook is hooked on a supply ship carelessly, a coil of an electromagnetic reversing valve is electrified, the electromagnetic reversing valve works at the right position and enables a control oil port of the first reversing valve to be communicated with a 3MPa constant-pressure oil source, at the moment, the two working oil ports of the motor are communicated through the lower-position work of the first reversing valve, and the motor can rotate freely under the traction of the supply ship; meanwhile, high-pressure oil in the 3MPa constant-pressure oil source enters the rope pressing device, the rope pressing device is opened, the pulling rope is finally pulled out of the winch assembly under the rotation of the motor, and hoisting equipment and a platform are prevented from being dragged down by a supply ship. Therefore, in the design, the rope pressing device and the first reversing valve are controlled by the electromagnetic reversing valve, the rope is abandoned when the hook is inadvertently hooked on the supply ship, and the equipment and the platform are prevented from being dragged down by the supply ship.

2. According to the lifting hydraulic system, the overflow pressure of the pilot-operated proportional overflow valve is changed along with the current of the electromagnet on the pilot-operated proportional overflow valve, different overflow pressures can be set by setting different current values, and when the pressure of an oil inlet of the two-way cartridge valve is greater than the overflow pressure of the pilot-operated proportional overflow valve, the pilot-operated proportional overflow valve overflows to enable the two-way cartridge valve to be conducted to enable two working oil ports of a motor to be communicated; the oil pressure of an oil port on the rope receiving side of the motor can be controlled to be kept within a certain range through the pilot-operated proportional overflow valve, so that the tension of a pull rope bearing a load is kept constant, and meanwhile, the effect of adjusting the tension of the pull rope can be achieved by adjusting the current of the electromagnet on the pilot-operated proportional overflow valve. Therefore, through arranging the pilot type proportional overflow valve and the two-way cartridge valve in the design, the tension of the pull rope bearing the load is kept constant, and the effect of adjusting the tension of the pull rope is achieved.

3. The control oil port of the two-way cartridge valve in the lifting hydraulic system is communicated with the oil inlet of the pilot-operated proportional overflow valve, when the pressure of the oil inlet of the two-way cartridge valve reaches the overflow pressure, high-pressure oil enters the oil inlet of the two-way cartridge valve and then flows into the pilot-operated proportional overflow valve from the damping hole on the valve core of the two-way cartridge valve to be communicated, then the hydraulic oil flows into an oil tank through the pilot-operated proportional overflow valve, the pressure of the control oil port of the two-way cartridge valve is reduced to be communicated with the two-way cartridge valve, the pilot-operated proportional overflow valve can control the through-flow of the two-way cartridge valve with large flow through a very small overflow flow, the energy is saved, the heat productivity is small, and the control precision is high. Therefore, the pilot-operated proportional overflow valve can control the through-flow of the large-flow two-way cartridge valve through a very small overflow flow, and the two-way cartridge valve is energy-saving, small in calorific value and high in control precision.

4. According to the lifting hydraulic system, the second one-way throttle valve is arranged on an oil path between the oil outlet of the second shuttle valve and the control end of the belt brake, the first one-way throttle valve is arranged on an oil path between the oil outlet of the second shuttle valve and the control end of the disc brake and communicated with the control end of the disc brake, and the opening degree of the throttle valves in the first one-way throttle valve and the second one-way throttle valve is adjusted to control the opening and closing speed of the brake of the winch component. Therefore, the brake speed of the winch assembly can be controlled by adjusting the opening degree of the throttle valves in the first one-way throttle valve and the second one-way throttle valve in the design.

5. According to the lifting hydraulic system, the oil inlet of the oil supplementing one-way valve is communicated with the oil tank, the oil outlet of the oil supplementing one-way valve is communicated with the oil way between the oil outlet of the two-way cartridge valve and the second working oil port of the system, and the risk of air suction is avoided when a motor is dragged reversely. Therefore, the oil supplementing one-way valve is arranged in the design, and the risk of air suction is avoided when the motor is dragged reversely.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: the hydraulic control system comprises a motor 1, a balance valve 2, a first reversing valve 3, a throttle valve 31, a first shuttle valve 4, a second reversing valve 5, a first one-way valve 6, a second shuttle valve 7, an electromagnetic reversing valve 8, a winch assembly 9, a disc brake 91, a belt brake 92, a roller 93, a rope pressing device 94, a pull rope 95, a hook 96, a pilot type proportional overflow valve 10, a two-way cartridge valve 11, a 3MPa constant pressure oil source 12, a one-way overflow valve 13, an oil supplementing one-way valve 14, a filter screen 15, a guide pulley 16, a pin shaft sensor 17, a first one-way throttle valve 18, a second one-way throttle valve 19, a system first working oil port A, a system second working oil port B, a first pressure measuring joint MA and a second pressure measuring joint MB.

Detailed Description

The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.

Referring to fig. 1, a lifting hydraulic system comprises a motor 1, a balance valve 2, a first reversing valve 3, a first shuttle valve 4, a second reversing valve 5, a first check valve 6, a second shuttle valve 7, an electromagnetic reversing valve 8, a winch assembly 9, a system first working oil port a and a system second working oil port B;

the system comprises a first working oil port A, a second working oil port B, a control oil port of a balance valve 2, an oil inlet of a first shuttle valve 4, an oil inlet of the first shuttle valve 4, an oil outlet of a second reversing valve 5, an oil inlet of the second reversing valve 5, an oil inlet of a first one-way valve 6, an oil inlet of the first one-way valve 6, a 3MPa constant-pressure oil source 12, an oil outlet of the second reversing valve 5, an oil inlet of a second shuttle valve 7, and an oil outlet of an electromagnetic reversing valve 8, wherein the first working oil port A of the system is communicated with one working oil port of a motor 1 through the balance valve 2, the other working oil port of the motor 1 is communicated with the second working oil port B of the system, the second working oil port B of the system is simultaneously communicated with a control oil port of the balance valve 2 and one oil inlet of the first shuttle valve 4, the working oil port of the electromagnetic directional valve 8 is communicated with an oil tank, and the oil inlet of the electromagnetic directional valve 8 is communicated with a 3MPa constant-pressure oil source 12;

a control oil port of the first reversing valve 3 is communicated with an oil outlet of the electromagnetic reversing valve 8, and two working oil ports of the first reversing valve 3 are respectively communicated with two working oil ports of the motor 1;

the winch assembly 9 comprises a disc brake 91, a belt brake 92, a roller 93, a rope pressing device 94 and a pull rope 95, wherein the rotating shaft of the roller 93 is in transmission fit with the output shaft of the motor 1, the disc brake 91 is arranged at one end, close to the motor 1, of the rotating shaft of the roller 9, and the belt brake 92 is arranged at one end, far away from the motor 1, of the rotating shaft of the roller 9;

the control end of the disc brake 91 is communicated with the oil outlet of the second shuttle valve 7, and the braking end of the disc brake 91 is matched with the rotating shaft of the roller 93; the control end of the belt brake 92 is communicated with the oil outlet of the second shuttle valve 7, and the braking end of the belt brake 92 is matched with the rotating shaft of the roller 93;

one end of the pull rope 95 is fixed on the roller 93 through a rope pressing device 94, the other end of the pull rope 95 is provided with a hook 96, and the control end of the rope pressing device 94 is communicated with the control oil port of the first reversing valve 3.

The lifting hydraulic system further comprises a pilot-operated proportional overflow valve 10 and a two-way cartridge valve 11, wherein an oil outlet of the pilot-operated proportional overflow valve 10 is communicated with an oil tank, an oil inlet of the pilot-operated proportional overflow valve 10 is communicated with a control oil port of the two-way cartridge valve 11, an oil inlet of the two-way cartridge valve 11 is communicated with an oil path between the motor 1 and the balance valve 2, and an oil outlet of the two-way cartridge valve 11 is communicated with a second working oil port B of the system.

The lifting hydraulic system further comprises a one-way overflow valve 13, an oil inlet of the one-way overflow valve 13 is communicated with an oil inlet of the two-way cartridge valve 11, and an oil outlet of the one-way overflow valve 13 is communicated with an oil tank.

A first pressure measuring joint MA communicated with the first working oil port A is arranged at the first working oil port A of the system, and a second pressure measuring joint MB communicated with the second working oil port B is arranged at the second working oil port B of the system.

The lifting hydraulic system further comprises an oil supplementing one-way valve 14, an oil inlet of the oil supplementing one-way valve 14 is communicated with an oil tank, and an oil outlet of the oil supplementing one-way valve 14 is communicated with an oil path between an oil outlet of the two-way cartridge valve 11 and a second working oil port B of the system;

a filter screen 15 is arranged at the control oil port of the balance valve 2.

One end of the pull rope 95 is fixed on the roller 93, the other end of the pull rope 95 passes through the guide pulley 16 and then is connected with the hook 96, and the middle part of the guide pulley 16 is provided with the pin sensor 17.

A first one-way throttle valve 18 is arranged on an oil path between the oil outlet of the second shuttle valve 7 and the control end of the disc brake 91;

a second one-way throttle valve 19 is arranged on an oil path between the oil outlet of the second shuttle valve 7 and the control end of the belt brake 92.

A throttle valve 31 is provided at one working oil port of the first direction valve 3.

The principle of the invention is illustrated as follows:

the left position of the balance valve 2 is in one-way conduction when working, and the right position of the balance valve 2 plays a role in throttling when working.

When the first reversing valve 3 works at the lower position, two working oil ports of the first reversing valve are communicated; when the first reversing valve 3 works on the upper position, two working oil ports of the first reversing valve are not communicated.

And when the second reversing valve 5 works at the lower position, the left oil inlet of the second shuttle valve 7 is communicated with the oil outlet of the first one-way valve 6, and when the second reversing valve 5 works at the upper position, the left oil inlet of the second shuttle valve 7 is communicated with the oil tank.

When an electromagnet DT2 of the electromagnetic directional valve 8 is not electrified, the electromagnetic directional valve 8 works at the left position, and at the moment, an oil inlet at the right side of the second shuttle valve 7 is communicated with an oil tank; when the electromagnet DT2 of the electromagnetic directional valve 8 is electrified, the electromagnetic directional valve 8 is switched to work at the right position, and at the moment, the right oil inlet of the second shuttle valve 7 is communicated with the 3MPa constant-pressure oil source 12.

When the hook 96 rises, hydraulic oil is controlled to enter the lifting hydraulic system from a first working oil port A of the system, wherein a part of the hydraulic oil flows into an oil inlet on the right side of the first shuttle valve 4 in the figure, flows out from an oil outlet of the first shuttle valve 4 and then enters a control end of the second reversing valve 5, so that the second reversing valve 5 works at the lower position, further an oil inlet on the left side of the second shuttle valve 7 is communicated with a 3MPa constant-pressure oil source 12, at the moment, the hydraulic oil in the 3MPa constant-pressure oil source 12 sequentially flows through the first one-way throttle valve 6, the second reversing valve 5 and the second shuttle valve 7, after flowing out from the oil outlet of the second shuttle valve 7, a part of the hydraulic oil flows into the control end of the disc brake 91 through the first one-way throttle valve 18, the other part of the hydraulic oil flows into the control end of the belt brake 92 through the second one-way throttle valve 19, at the moment, the disc brake 91 and the belt brake 92 are opened, and the roller 93 can rotate along with the motor 1; at the moment, the balance valve 2 works at the left position, the balance valve 2 is in a one-way conduction state, hydraulic oil sequentially flows through the balance valve 2 and the motor 1 and leaves the lifting hydraulic system from a second working oil port B of the system, the motor 1 rotates forwards under the action of the hydraulic oil, and the roller 93 rotates forwards to take up the rope.

When the hook 96 descends, hydraulic oil is controlled to enter a lifting hydraulic system from a second working oil port B of the system, wherein a part of hydraulic oil flows into an oil inlet on the left side of the first shuttle valve 4 in the drawing, flows out of an oil outlet of the first shuttle valve 4 and then flows into a control end of the second reversing valve 5, so that the second reversing valve 5 works at a lower position, further an oil inlet on the left side of the second shuttle valve 7 is communicated with a 3MPa constant-pressure oil source 12, at the moment, the hydraulic oil in the 3MPa constant-pressure oil source 12 sequentially flows through the first one-way valve 6, the second reversing valve 5 and the second shuttle valve 7, after flowing out of the oil outlet of the second shuttle valve 7, a part of the hydraulic oil flows into a control end of the disc brake 91 through the first one-way throttle valve 18, the other part of the hydraulic oil flows into a control end of the belt brake 92 through the second one-way throttle valve 19, at the moment, the disc brake 91 and the belt brake 92 are opened, and the roller 93 can rotate along with the motor 1; the other part of the hydraulic oil flows into the control end of the balance valve 2 from the second working oil port B of the system, the balance valve 2 is switched to the right working state, at this time, the hydraulic oil flows in from the working oil port on the right side of the motor 1 in the figure, flows into the balance valve 2 after flowing through the motor 1, and finally flows out from the first working oil port a of the system, the motor 1 rotates reversely under the action of the hydraulic oil, and the roller 93 rotates reversely to release the rope. At the moment, the right position of the balance valve 2 works to play a throttling role, the speed of the roller 93 for reversely rotating and releasing the rope is limited, and the stalling is avoided when the load is released.

When an emergency occurs, for example, a hook of a fixed platform crane is hooked on a supply ship carelessly, an operator finds abnormality, controls the first working oil port A and the second working oil port B of the system to release pressure, controls the electromagnet DT2 of the electromagnetic directional valve 8 to be electrified, controls the electromagnet DT2 of the electromagnetic directional valve 8 to work at the right position, and at the moment, an oil inlet at the right side of the second shuttle valve 7 is communicated with the 3MPa constant-pressure oil source 12, and a part of hydraulic oil in the 3MPa constant-pressure oil source 12 flows into the second shuttle valve 7 after passing through the electromagnetic directional valve 8 and flows into the control ends of the disc brake 91 and the belt brake 92 through the first one-way throttle valve 18 and the second one-way throttle valve 19 respectively, so that the braking ends of the disc brake 91 and the belt brake 92 are opened, and the roller 93 can rotate freely along with the motor 1; another part of hydraulic oil in the 3MPa constant-pressure oil source 12 flows through the electromagnetic directional valve 8 and then flows into the control end of the first directional valve 3 and the control end of the rope pressing device 94 respectively, so that the first directional valve 3 works at the lower position, and then the two working oil ports of the motor 1 are communicated, and at the moment, the motor 1 can rotate freely under the traction of the supply ship; meanwhile, the hydraulic oil flowing into the control end of the rope pressing device 94 drives the rope pressing device 94 to be opened, the pull rope 95 is drawn out from the roller 93 along with the traction of the supply ship, and active rope abandoning is achieved, so that the hoisting equipment and the platform are prevented from being dragged by the supply ship. In this process, the throttle valve 31 is used to adjust the rotational speed of the motor.

The guide pulley 16 is used for changing the transmission direction of the pull rope, the pin shaft sensor 17 arranged in the middle of the guide pulley 16 can monitor the bearing of the pull rope 95, and when the pin shaft sensor 17 senses that the load on the pull rope 95 exceeds a certain limit, the electromagnet of the electromagnetic reversing valve 8 can be automatically controlled to be electrified, so that passive rope abandoning in an emergency is realized.

The overflow pressure of the pilot-operated proportional relief valve 10 can be changed along with the change of the current of the electromagnet DT1 of the pilot-operated proportional relief valve 10, the overflow pressure can be adjusted by setting different current values, and the tension of the pull rope 95 can be controlled by adjusting the circuit of the electromagnet DT1 of the pilot-operated proportional relief valve 10 as different overflow pressures correspond to different tensions of the pull rope 95;

when the tension of the pulling rope 95 is increased, the pressure of the oil inlet of the two-way cartridge valve 11 is increased, because a valve core of the two-way cartridge valve 11 is provided with a damping hole for communicating the oil inlet and the control oil port, a small part of hydraulic oil flowing into the oil inlet of the two-way cartridge valve 11 flows to the control port of the two-way cartridge valve 11 through the damping hole on the valve core of the two-way cartridge valve 11 and further flows to the oil inlet of the pilot-operated proportional overflow valve 10, when the oil pressure of the oil inlet of the pilot-operated proportional overflow valve 10 reaches a set pressure value, the pilot-operated proportional overflow valve 10 starts to overflow, the pressure of the control oil port of the two-way cartridge valve 11 is reduced, so that the two working oil ports of the two-way cartridge valve 11 are communicated, at this time, the two working oil ports of the motor 1 are communicated, and the motor 1 can rotate reversely under the dragging of the pulling rope 95.

The one-way overflow valve 13 controls the system pressure not to be overloaded.

Example 1:

a lifting hydraulic system comprises a motor 1, a balance valve 2, a first reversing valve 3, a first shuttle valve 4, a second reversing valve 5, a first one-way valve 6, a second shuttle valve 7, an electromagnetic reversing valve 8, a winch assembly 9, a system first working oil port A and a system second working oil port B; the system comprises a first working oil port A, a second working oil port B, a control oil port of a balance valve 2, an oil inlet of a first shuttle valve 4, an oil inlet of the first shuttle valve 4, an oil outlet of a second reversing valve 5, an oil inlet of the second reversing valve 5, an oil inlet of a first one-way valve 6, an oil inlet of the first one-way valve 6, a 3MPa constant-pressure oil source 12, an oil outlet of the second reversing valve 5, an oil inlet of a second shuttle valve 7, and an oil outlet of an electromagnetic reversing valve 8, wherein the first working oil port A of the system is communicated with one working oil port of a motor 1 through the balance valve 2, the other working oil port of the motor 1 is communicated with the second working oil port B of the system, the second working oil port B of the system is simultaneously communicated with a control oil port of the balance valve 2 and one oil inlet of the first shuttle valve 4, the working oil port of the electromagnetic directional valve 8 is communicated with an oil tank, and the oil inlet of the electromagnetic directional valve 8 is communicated with a 3MPa constant-pressure oil source 12; a control oil port of the first reversing valve 3 is communicated with an oil outlet of the electromagnetic reversing valve 8, and two working oil ports of the first reversing valve 3 are respectively communicated with two working oil ports of the motor 1; the winch assembly 9 comprises a disc brake 91, a belt brake 92, a roller 93, a rope pressing device 94 and a pull rope 95, wherein the rotating shaft of the roller 93 is in transmission fit with the output shaft of the motor 1, the disc brake 91 is arranged at one end, close to the motor 1, of the rotating shaft of the roller 93, and the belt brake 92 is arranged at one end, far away from the motor 1, of the rotating shaft of the roller 9; the control end of the disc brake 91 is communicated with the oil outlet of the second shuttle valve 7, and the braking end of the disc brake 91 is matched with the rotating shaft of the roller 93; the control end of the belt brake 92 is communicated with the oil outlet of the second shuttle valve 7, and the braking end of the belt brake 92 is matched with the rotating shaft of the roller 93; one end of the pull rope 95 is fixed on the roller 93 through a rope pressing device 94, the other end of the pull rope 95 is provided with a hook 96, and the control end of the rope pressing device 94 is communicated with the control oil port of the first reversing valve 3.

Example 2:

example 2 is substantially the same as example 1 except that:

the lifting hydraulic system further comprises a pilot-operated proportional overflow valve 10 and a two-way cartridge valve 11, wherein the oil outlet of the pilot-operated proportional overflow valve 10 is communicated with an oil tank, the oil inlet of the pilot-operated proportional overflow valve 10 is communicated with a control oil port of the two-way cartridge valve 11, the oil inlet of the two-way cartridge valve 11 is communicated with an oil path between the motor 1 and the balance valve 2, and the oil outlet of the two-way cartridge valve 11 is communicated with a second working oil port B of the system; the lifting hydraulic system further comprises a one-way overflow valve 13, an oil inlet of the one-way overflow valve 13 is communicated with an oil inlet of the two-way cartridge valve 11, and an oil outlet of the one-way overflow valve 13 is communicated with an oil tank; a first pressure measuring joint MA communicated with the first working oil port A is arranged at the first working oil port A of the system, and a second pressure measuring joint MB communicated with the second working oil port B is arranged at the second working oil port B of the system; the lifting hydraulic system further comprises an oil supplementing one-way valve 14, an oil inlet of the oil supplementing one-way valve 14 is communicated with an oil tank, and an oil outlet of the oil supplementing one-way valve 14 is communicated with an oil path between an oil outlet of the two-way cartridge valve 11 and a second working oil port B of the system; a filter screen 15 is arranged at the control oil port of the balance valve 2.

Example 3:

example 3 is substantially the same as example 2 except that:

one end of the pull rope 95 is fixed on the roller 93, the other end of the pull rope 95 passes through the guide pulley 16 and then is connected with the hook 96, and the middle part of the guide pulley 16 is provided with the pin shaft sensor 17; a first one-way throttle valve 18 is arranged on an oil path between the oil outlet of the second shuttle valve 7 and the control end of the disc brake 91; a second one-way throttle valve 19 is arranged on an oil path between the oil outlet of the second shuttle valve 7 and the control end of the belt brake 92; a throttle valve 31 is provided at one working oil port of the first direction valve 3.