KR101870646B1 - Hydraulic system for crane using safety valve - Google Patents

Hydraulic system for crane using safety valve Download PDF

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Publication number
KR101870646B1
KR101870646B1 KR1020180018950A KR20180018950A KR101870646B1 KR 101870646 B1 KR101870646 B1 KR 101870646B1 KR 1020180018950 A KR1020180018950 A KR 1020180018950A KR 20180018950 A KR20180018950 A KR 20180018950A KR 101870646 B1 KR101870646 B1 KR 101870646B1
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KR
South Korea
Prior art keywords
hydraulic
line
control valve
oil
hydraulic control
Prior art date
Application number
KR1020180018950A
Other languages
Korean (ko)
Inventor
황시동
Original Assignee
주식회사 동남티에스
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Application filed by 주식회사 동남티에스 filed Critical 주식회사 동남티에스
Priority to KR1020180018950A priority Critical patent/KR101870646B1/en
Application granted granted Critical
Publication of KR101870646B1 publication Critical patent/KR101870646B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/40—Applications of devices for transmitting control pulses; Applications of remote control devices
    • B66C13/42—Hydraulic transmitters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/001—Servomotor systems with fluidic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure

Abstract

The present invention is designed to be suitable for durability test and safety test and can solve the speed reduction of the hydraulic motor generated after the safety test so that the normal operation can be performed quickly by using the safety side of the hydraulic cranes, A hydraulic pump for forcibly supplying the stored oil, a hydraulic motor driven by the oil supplied by the hydraulic pump, and a control unit for controlling the hydraulic pressure from the hydraulic pump, A hydraulic control valve for controlling the supply of oil to the motor, a first line connected to one side of the hydraulic control valve and the hydraulic motor, a second line connected to the other side of the hydraulic control valve and the hydraulic motor, Installed on line 2, shut off the oil supply line installed when hydraulic pressure above a certain value It is characterized in that the gas supply means comprises an oil.

Description

Technical Field [0001] The present invention relates to a hydraulic system for a crane using a safety valve,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for minimizing an allowable range between a safe load and an overload load by using a safety valve of a hydraulic crane and more particularly to a system for supplying oil stored from an oil storage tank to a hydraulic motor through a hydraulic pump, The present invention relates to a system for minimizing an allowable range between a safety load and an overload load by using a safety valve of a hydraulic crane to enable a hydraulic device driven by a hydraulic pump to be operated correctly.

The hydraulic system is generally used where a high power is required and a high pressure is required. A hydraulic pressure is formed by using a hydraulic pump, and the hydraulic pressure is controlled by opening and closing a hydraulic valve such as the Korean Registered Patent Publication No. 10-1492426 It is a system that supplies through equipment and piping.

However, such a conventional technique has a problem in that the load applied to a device such as a crane does not have a measure for exceeding a safety load (a safety working load or a safety load), thereby greatly impairing safety.

In order to solve this problem, each class is obliged to conduct a safety test on the crane applied to the ship.

Korean Registered Patent Publication No. 10-1492426 (Announcement of Nov. 2015)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems and the present invention has been made to solve the above problems and to provide a hydraulic cranes suitable for durability test and safety test, The purpose of the system is to provide.

Another object of the present invention is to provide a system for minimizing a permissible range between a safety load and an overload load by using a safety valve of a hydraulic crane capable of quickly reducing the speed of a hydraulic motor generated after a safety test There is a purpose.

As a means for solving the above-mentioned problems, a system for minimizing an allowable range between a safety load and an overload load using a safety valve of a hydraulic crane of the present invention,

Oil storage tanks for storing oil,

A hydraulic pump for forcibly supplying the stored oil,

A hydraulic motor driven by the oil supplied by the hydraulic pump,

A hydraulic operation valve for controlling the supply of oil from the hydraulic pump to the hydraulic motor,

A first line connected to one side of the hydraulic control valve and the hydraulic motor,

A second line connected to the other side of the hydraulic control valve and the hydraulic motor,

And an oil supply restricting means provided at the first line or the second line for shutting off the oil supply line provided at the time of operating the hydraulic pressure of a predetermined value or more.

Further, the oil supply restricting means may include:

A first hydraulic control valve installed on the first line or the second line for connecting or disconnecting the line,

And a second hydraulic pressure control valve connected to the line provided with the first hydraulic pressure control valve and supplying hydraulic pressure to the first hydraulic pressure control valve to operate the first hydraulic pressure control valve when the hydraulic pressure on the line is equal to or higher than a predetermined value, .

Further, the first hydraulic control valve is composed of a pilot operated two-port two-position control valve,

The second hydraulic control valve is composed of a pilot operated three port two position control valve,

Wherein the oil supply restricting means comprises:

A third line connecting a line between the hydraulic operation valve and the first hydraulic control valve to an inlet-side first port of the second hydraulic control valve,

A fourth line connecting the pilot pressure supply side of the first hydraulic control valve and the outlet side port of the second hydraulic control valve,

And a fifth line connecting the oil storage tank and the inlet-side second port of the second hydraulic control valve.

Further, the oil supply restricting means may include:

A sixth line connecting the fourth line and the fifth line,

And a temperature compensating series type flow rate control valve provided on the sixth line.

Through the above-mentioned problem solving means, the system for minimizing the allowable range between the safety load and the overload load using the safety side of the hydraulic crane of the present invention is suitable for the durability test and the safety test, The speed reduction of the hydraulic motor can be solved and the normal operation can be performed quickly.

FIG. 1 is a view briefly showing a system for minimizing an allowable range between a safety load and an overload load using a safety valve of a hydraulic crane according to the present invention.
FIG. 2 is a view illustrating an operating state of a system in an overload state in order to realize an allowable range between a safe load and an overload load using a safety valve of a hydraulic crane according to the present invention.

A preferred embodiment of a system for minimizing an allowable range between a safe load and an overload load using a safety valve of a hydraulic crane according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view of a system for minimizing an allowable range between a safety load and an overload load using a safety valve of a hydraulic crane according to the present invention. FIG. 2 is a view showing a safety load and an overload FIG. 3 is a view showing an operation state of the system during an overload in order to minimize the allowable range between loads.

1, a system for minimizing the allowable range between a safety load and an overload load using a safety valve of a hydraulic crane according to the present invention includes an oil storage tank 1, a hydraulic pump 2, a hydraulic motor 3, A hydraulic control valve 4, a first line 5, a second line 6, and the like.

Here, the oil storage tank 1 may be a plurality of means for storing oil, and the hydraulic pump 2 is a power generating means that is driven by an electric motor to forcibly supply oil, and the hydraulic motor 3 is a means for rotating the hoist winch or the like through a power transmission shaft driven by the oil supplied by the hydraulic pump 2. The hydraulic operation valve 4 is connected to the hydraulic motor 3 Wherein the first line (5) is a line connected to one side of the hydraulic operating valve (4) and the hydraulic motor (3), and the second line (6) And is connected to the other side of the valve (4) and the hydraulic motor (3).

The hydraulic pressure is selectively supplied to the first line (5) or the second line (6) through operation of the hydraulic control valve (4) and is recovered.

As shown in FIG. 1, the system for minimizing the allowable range between the safety load and the overload load using the safety side of the hydraulic crane according to the present invention minimizes the allowable range between the safety load and the overload load using the safety side of the hydraulic crane In order to secure the safety of the device in a hoist or the like where a system for implementation is installed, the hydraulic pressure supply line may be shut off when hydraulic pressure of a predetermined value or more is applied in order to prevent use in an overload state. An oil supply restricting means is provided in the first line (5) or the second line (6) for shutting off the oil supply line provided when hydraulic pressure of a predetermined value or more is operated.

For example, in the case of a hoist mounted on a ship, the operation is stopped at a value of 110% of the allowable safe operating load in the regulations of the Society, etc. In the present invention, this is solved through the oil supply restricting means, So that it can be operated quickly without delay after confirming the operation stoppage.

The oil supply restricting means includes a first hydraulic control valve 7 provided on the first line 5 or the second line 6 to connect or disconnect the line, A second hydraulic pressure control valve 8 connected to the line provided with the hydraulic pressure control valve 7 for supplying hydraulic pressure to the first hydraulic pressure control valve 7 so that the first hydraulic pressure control valve 7 is operated .

Specifically, the first hydraulic control valve 7 is a pilot operated two-port two-position control valve, and the second hydraulic control valve 8 is a pilot-operated three-port two-position control valve.

The oil supply restricting means includes a third line connecting the line between the hydraulic control valve 4 and the first hydraulic control valve 7 and the first port at the inlet side of the second hydraulic control valve 8, A fourth line 10 connecting the pilot pressure supply side of the first hydraulic pressure control valve 7 and the outlet side port of the second hydraulic pressure control valve 8; And a fifth line (11) connecting a second port on the inlet side of the second hydraulic control valve (8).

The oil supply restricting means includes a sixth line 12 connecting the fourth line 10 and the fifth line 11 and a sixth line 12 connecting the fourth line 10 and the fifth line 11, A valve 13 is provided to enable accurate hydraulic pressure control according to the outside air condition.

The first hydraulic control valve 7 is configured to maintain the first line 5 or the second line 6 in an open state and close at an operating position in a normal position, The third line 9 and the fourth line 10 are disconnected at the normal position and the fourth line 10 and the fifth line 11 are connected to each other, And to connect the fourth line 10. The pilot pressure of the second hydraulic pressure control valve 8 becomes the hydraulic pressure supplied to the third line 9 and the pilot pressure of the second hydraulic pressure control valve 8 is stably supplied to the third line 9. [ And a throttling portion in which the flow path section is reduced for controlling the flow rate.

A counterbalance valve 14 is provided on the first line 5 or the second line 6 to prevent a drop due to its own load or the like and the second hydraulic control valve 8 The third line 9 to be connected is connected to the line between the counterbalance valve 14 and the hydraulic operating valve 4.

Hereinafter, the operation of the system for minimizing the allowable range between the safety load and the overload load using the safety valve of the hydraulic crane according to the present invention will be described.

The hydraulic pressure supplied to the fourth line 10 is maintained at the normal position because the hydraulic pressure supplied through the third line 9 is less than a predetermined value at the time of a safe normal load, The first hydraulic pressure control valve 7 is maintained at the normal position because the pilot pressure does not exist and the oil is normally supplied to the hydraulic motor 3 so that the device such as the crane is normally operated.

When the applied load exceeds the safe range, the hydraulic pressure supplied through the third line 9 is greater than a predetermined value, as shown in FIG. 2, so that the second hydraulic control valve 8 is switched to the operating position The hydraulic pressure supplied to the fourth line 10 is supplied and the supplied hydraulic pressure acts as a pilot pressure to switch the first hydraulic control valve 7 to the operating position to interrupt the supply of oil to the hydraulic motor 3, And so on.

The second oil pressure control valve 8 returns to the normal position and the oil supplied to the first oil pressure control valve 7 through the fourth line 10 is returned to the normal state, 5 line 11 to the oil storage tank 1. The oil storage tank 1 shown in Fig.

Due to the nature of the relief valve installed in this process, the problem of initial speed reduction and other problems can be solved by returning oil.

Through the above-described construction, the system for minimizing the allowable range between the safety load and the overload load using the safety side of the hydraulic crane of the present invention is suitable for the durability test and the safety test, The speed reduction of the motor 3 can be solved, and the normal operation can be performed quickly.

1: Oil storage tank 2: Hydraulic pump
3: Hydraulic motor 4: Hydraulic operation valve
5: first line 6: second line
7: first hydraulic control valve 8: second hydraulic control valve
9: third line 10: fourth line
11: fifth line 12: sixth line
13: Temperature compensated series flow control valve
14: Counter balance valve

Claims (1)

Oil storage tanks for storing oil,
A hydraulic pump for forcibly supplying the stored oil,
A hydraulic motor driven by the oil supplied by the hydraulic pump,
A hydraulic operation valve for controlling the supply of oil from the hydraulic pump to the hydraulic motor,
A first line connected to one side of the hydraulic control valve and the hydraulic motor,
A second line connected to the other side of the hydraulic control valve and the hydraulic motor,
And an oil supply restricting means provided at the first line or the second line for shutting off the oil supply line provided when hydraulic pressure of a predetermined value or more is operated,
Wherein the oil supply restricting means comprises:
A first hydraulic control valve installed on the first line or the second line to connect or disconnect the line; And
A second hydraulic control valve connected to a line provided with the first hydraulic control valve and supplying hydraulic pressure to the first hydraulic control valve to operate the first hydraulic control valve when the oil pressure on the line is equal to or higher than a predetermined value; And,
The first hydraulic control valve is composed of a pilot operated two-port two-position control valve,
The second hydraulic control valve is composed of a pilot operated three port two position control valve,
Wherein the oil supply restricting means comprises:
A third line connecting a line between the hydraulic control valve and the first hydraulic control valve and a first port on the inlet side of the second hydraulic control valve;
A fourth line connecting the pilot pressure supply side of the first hydraulic control valve and the outlet side port of the second hydraulic control valve;
A fifth line connecting the second port of the oil storage tank and the inlet side of the second hydraulic control valve; Further comprising:
The first hydraulic control valve is configured to maintain the first line or the second line in the open state at the normal position and close at the operating position,
The second hydraulic pressure control valve blocks the connection of the third line and the fourth line at a normal position and connects the fourth line and the fifth line, and connects the third line and the fourth line at the operating position, ,
And the pilot pressure of the second hydraulic pressure control valve is an oil pressure supplied to the third line
A system for minimizing the allowable range between safe load and overload load by using safety side of hydraulic crane
KR1020180018950A 2018-02-18 2018-02-18 Hydraulic system for crane using safety valve KR101870646B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020180018950A KR101870646B1 (en) 2018-02-18 2018-02-18 Hydraulic system for crane using safety valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020180018950A KR101870646B1 (en) 2018-02-18 2018-02-18 Hydraulic system for crane using safety valve

Related Child Applications (1)

Application Number Title Priority Date Filing Date
KR1020180069933A Division KR20190099995A (en) 2018-06-19 2018-06-19 Hydraulic system for crane using safety valve

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KR101870646B1 true KR101870646B1 (en) 2018-06-25

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KR1020180018950A KR101870646B1 (en) 2018-02-18 2018-02-18 Hydraulic system for crane using safety valve

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101746532B1 (en) 2017-01-16 2017-06-14 주식회사 동남티에스 2 stage speed control hydraulic system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101746532B1 (en) 2017-01-16 2017-06-14 주식회사 동남티에스 2 stage speed control hydraulic system

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