KR101705883B1 - Pump system for high pressure loading device - Google Patents

Pump system for high pressure loading device Download PDF

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Publication number
KR101705883B1
KR101705883B1 KR1020150078868A KR20150078868A KR101705883B1 KR 101705883 B1 KR101705883 B1 KR 101705883B1 KR 1020150078868 A KR1020150078868 A KR 1020150078868A KR 20150078868 A KR20150078868 A KR 20150078868A KR 101705883 B1 KR101705883 B1 KR 101705883B1
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KR
South Korea
Prior art keywords
expansion
hydraulic pressure
pump
valve
shrinkage
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Application number
KR1020150078868A
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Korean (ko)
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KR20160142737A (en
Inventor
최용규
이민희
Original Assignee
경성대학교 산학협력단
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Priority to KR1020150078868A priority Critical patent/KR101705883B1/en
Publication of KR20160142737A publication Critical patent/KR20160142737A/en
Application granted granted Critical
Publication of KR101705883B1 publication Critical patent/KR101705883B1/en

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    • 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
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/02—Systems with continuously-operating input and output apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/08—Combinations of two or more pumps the pumps being of different types
    • F04B23/10—Combinations of two or more pumps the pumps being of different types at least one pump being of the reciprocating positive-displacement type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means

Abstract

An object of the present invention is to provide a pumping system for a loading device which can apply a high-pressure hydraulic pressure to a remote hydraulic cylinder while the operation is convenient.
In order to achieve the above object, the present invention provides a pumping system for a load device used in a loading device for applying a load for measuring a bearing capacity of a pile for civil engineering construction, the load being repeatedly applied to a pile, A hydraulic cylinder in which the piston moves in a direction in which the piston expands when supplied and a piston moves in a direction in which the piston contracts the stroke when hydraulic pressure is supplied to the contracted portion; case; An oil tank attached to the lower end of the case and containing oil for generating hydraulic pressure; A first pump for sucking and compressing oil in the oil tank; A second pump for raising the hydraulic pressure discharged from the first pump; An expansion operation unit that supplies the hydraulic pressure discharged from the second pump to the expansion unit and guides the hydraulic pressure fed back from the expansion unit to the oil tank; And a shrinkage operation part for supplying the oil pressure discharged from the second pump to the shrinkage part and guiding the oil pressure returning from the shrinkage part to the oil tank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pumping system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump system for a load device, and more particularly, to a pump system for a load device for transferring a hydraulic pressure of a high pressure over a long distance.

In the case of foundation piles used for civil engineering construction, a loading device is used to measure bearing capacity, settlement amount and axial load distribution.

The method of measuring the bearing capacity using the above-mentioned load device is based on the experience of the pile holding test, the piling test, the dynamic pile test, the static bearing capacity formula, the dynamic bearing capacity formula, Equation, wave equation, estimation by pile analysis code, estimation by continuum analysis, etc. Among these methods, pile load test is most reliable.

On the other hand, Japanese Patent No. 588761 discloses a configuration of a test apparatus for reducing the number of hydraulic cylinders used in a load test. The upper plate and the lower plate are fixed to each other with a predetermined gap therebetween. The upper plate and the lower plate are fixed to each other with a predetermined gap therebetween. A hydraulic cylinder provided at a predetermined position between the back surface of the upper plate and the upper surface of the lower plate and exerting hydraulic pressure; and a load comprising a displacement measuring magnetic sensor installed in the vicinity of the hydraulic cylinder, A device; A top plate displacement measuring rod installed vertically on the top surface of the top plate to measure a displacement of the top plate, a top plate displacement measuring rod casing having the top plate displacement measuring rod incorporated therein, and a bottom plate vertically installed on the top surface of the top plate to measure the displacement of the bottom plate. A displacement measuring rod comprising a displacement measuring rod and a lower plate displacement measuring rod casing having the lower plate displacement measuring rod; The upper surface of the upper plate is fixed to the upper surface of the upper plate to guide the concrete to the through hole. The upper surface of the upper plate has a plurality of vertically coupled reinforcing bars. The reinforcing bars are coupled to the outer surface of the reinforcing bars, And a concrete sister bar, a sensor cable installed for transmitting signals and current to the axial load sensor and a concrete sidewall for concrete, and coupled with a clearance of a predetermined length so as not to be broken by tension, And an automatic measuring system for displaying and storing the measured value from the bar.

The above apparatus is very effective in reducing the number of hydraulic cylinders used, but in the case of long piles, a pressure drop occurs due to a long pipeline from the hydraulic pump to the hydraulic cylinder.

In the case of a hydraulic cylinder used in a loading device, it is preferable that a high pressure of 3000 bar or more is applied for the degree of the test. However, when a general hydraulic pump is used according to the pipe length as described above, And a new type of pump system specialized in a loading device is needed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pumping system for a loading device that can apply a high-pressure hydraulic pressure to a remote hydraulic cylinder while being easy to operate.

In order to achieve the above object, the present invention provides a pumping system for a load device used in a loading device for applying a load for measuring a bearing capacity of a pile for civil engineering construction, the load being repeatedly applied to a pile, A hydraulic cylinder in which the piston moves in a direction in which the piston expands when supplied and a piston moves in a direction in which the piston contracts the stroke when hydraulic pressure is supplied to the contracted portion; case; An oil tank attached to the lower end of the case and containing oil for generating hydraulic pressure; A first pump for sucking and compressing oil in the oil tank; A second pump for raising the hydraulic pressure discharged from the first pump; An expansion operation unit that supplies the hydraulic pressure discharged from the second pump to the expansion unit and guides the hydraulic pressure fed back from the expansion unit to the oil tank; And a shrinkage operation part for supplying the oil pressure discharged from the second pump to the shrinkage part and guiding the oil pressure returning from the shrinkage part to the oil tank.

Preferably, the expansion operation portion includes: an expansion pipe connected to the discharge port of the second pump; An expansion operation valve for opening and closing the expansion pipe; An expansion drain pipe branched from the expansion pipe after the expansion operation valve and communicating with the oil tank; An expansion drain valve for opening and closing the expansion drain line; An expansion coupler attached to an end of the expansion pipe; And a supply pipe communicating the expansion coupler and the expansion unit.

More preferably, the contraction actuating part comprises: a contraction pipe connected to the discharge port of the second pump; A contraction actuating valve for opening and closing the contraction conduit; A shrink drain pipe branched from the shrink duct after the shrink actuating valve and communicating with the oil tank; A shrink drain valve for opening and closing the shrink drain pipe; A shrinkable coupler attached to an end of the shrink duct; And a supply pipe communicating the shrinkage coupler and the shrinkage portion.

More preferably, the expansion operation unit further includes an expansion pressure gauge that senses the hydraulic pressure inside the expansion pipe, and the shrinkage operation unit further includes a shrinkage pressure gauge that senses the hydraulic pressure inside the shrinkage pipe.

More preferably, the expansion operation valve, the expansion drain valve, the shrink operation valve, the shrinkage drain valve, the expansion pressure gauge, and the shrinkage pressure gauge are installed on the front panel formed on the front surface of the case.

Preferably, when the expansion operation valve is opened, the shrinking operation valve is closed, the expansion drain valve is closed, and the shrinkage drain valve is opened, hydraulic pressure is supplied to the expansion portion, When the expansion stroke valve is closed, the expansion valve is opened, the expansion valve is closed, the expansion valve is closed, the expansion valve is closed, the expansion valve is closed, And the hydraulic pressure of the expansion portion is returned to contract the stroke of the hydraulic cylinder.

The pump system for a loader according to the present invention is characterized in that a high pressure pipe and a low pressure pipe connected to a hydraulic cylinder are inserted into a box-shaped case and inserted thereinto. The two pump units and a plurality of valves are used to interlock with the expansion and contraction parts of the hydraulic cylinder Thereby providing an effect that the test using the loading device can be conveniently performed.

1 is an external perspective view of a pump system for a loader according to the present invention,
Fig. 2 is a hydraulic circuit diagram constructed inside Fig. 1,
FIG. 3 is a hydraulic pressure flow chart during the expansion operation of FIG. 2,
4 is a hydraulic pressure flow chart at the time of contraction operation of Fig.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1, the pump system 100 for a loader according to the present invention includes a case 10, an oil tank 13 positioned at a lower end of the case 10, A wheel 14 attached to the lower end of the oil tank 13 and an expanding portion 91 of the hydraulic cylinder 90 which is attached to the side surface of the case 10 and located outside, And an expansion coupler 81 and a shrinkage coupler 82 to which a supply pipe path 93 for supplying a hydraulic pressure to the pipe 92 is connected.

The case 10 plays a role of supporting the entire structure and is realized with an appropriate strength, and can be configured to be of a closed type if necessary.

The oil tank 13 is positioned at the lower end of the case 10, and a supply port for replenishing oil is formed therein. Since the oil is located inside the oil tank 13, sealing performance and sufficient strength are preferably realized .

Also, the lower end of the oil tank 13 includes a wheel 14 for moving the entire system, and the wheel 14 is preferably formed of a caster.

A front panel 11 is disposed on the front surface of the case 10 and a pressure gauge for indicating inflation pressure and contraction pressure and an operating unit for operating the valve are installed on the front panel 11.

Here, the expansion means that the stroke of the piston rod mounted on the hydraulic cylinder 90 expands, and the contraction means that the stroke of the piston rod contracts.

2, the internal structure of the pumping system 100 for a loader according to the present invention includes an oil tank 13 in which oil is stored, an oil tank 13 for sucking and pressurizing the oil in the oil tank 13, 1 pump 21 and a second pump 22 for further pressurizing the hydraulic pressure discharged from the first pump 21. The hydraulic pressure discharged from the second pump 22 is branched into two pipes Supplied to the expansion portion 91 and the contracted portion 92 of the hydraulic cylinder 90 via the supply pipe path 93 via the expansion operation portion 30 and the constricted operation portion 40 respectively and the supplied hydraulic pressure is supplied to the expansion portion 91 and the contracted portion 92, And returns to the expanding portion 91 and the contracting portion 92 through the supply pipe path 93, respectively.

The first pump 21 may be a gear type pump or a vane type pump. The second pump 22 may be reciprocating, but other types of pumps may be used.

If the first pump 21 is set to discharge the hydraulic pressure of 200 to 300 bar, the second pump 22 may be set to discharge the hydraulic pressure to a pressure of about 3000 bar. However, the setting is an embodiment, You can also configure the entire device with settings.

Further, a check valve or a relief valve for safety may be additionally installed between the first pump 21 and the second pump 22. [

The expansion operation portion 30 is configured to expand and contract the expansion pipe 31 through an expansion operation valve 32, an expansion pressure gauge 33, and an expansion drain pipe 34 to the expansion pipe 31 communicating with the discharge port of the second pump 22 And communicates with the coupler 81.

The expansion drain pipe 34 is opened or closed by an expansion drain valve 35 and the expansion drain pipe 34 is connected to the oil tank 13 via a hydraulic pressure drain connected to the oil tank 13, .

The expansion operation valve 32, the expansion pressure gauge 33 and the expansion drain valve 35 are formed on the front panel 11 of the case 10 so that the user can recognize the pressure and operate the valve.

The shrinking operation unit 40 is connected to the shrinking conduit 41 communicating with the discharge port of the second pump 22 via the shrinking operation valve 42, the shrinkage pressure gauge 43, the shrinking drain pipe 44, And communicates with the coupler 82.

The shrink drain pipe 44 is opened or closed by a shrink drain valve 45 and the shrink drain pipe 44 is connected to the oil tank 13 via a hydraulic pressure drain communicated with the oil tank 13 .

The shrinking operation valve 42, the contraction pressure gauge 43 and the shrinkage drain valve 45 are also formed on the front panel 11 of the case 10 so that the user can recognize the pressure and operate the valve.

The pressure gauges 33, 43 may be constructed of conventional pressure gauges, but may also be implemented in a digital manner, if desired.

In addition, the pipelines 31 and 41 may be formed by adding a relief valve or the like which operates when a pressure higher than a certain level is applied for safety.

On the other hand, the pump system 100 for a loader according to the present invention operates the four valves to drive the hydraulic cylinder 90 reciprocally.

First, the expansion drive of the hydraulic cylinder 90 opens the expansion operation valve 32 and closes the expansion drain valve 35, as shown in FIG.

Then, the hydraulic pressure discharged to the second pump (22) is supplied to the expansion portion (91) of the hydraulic cylinder (90).

At this time, when the shrinking operation valve 42 is closed and the shrinking drain valve 45 is opened, the oil pressure located in the shrinking portion 92 of the hydraulic cylinder 90 flows through the shrinking drain pipe 44, And returns to the tank 13.

Conversely, the shrinking drive of the hydraulic cylinder 90 opens the shrinking action valve 42 and closes the shrinkage drain valve 45, as shown in Fig.

Then, the hydraulic pressure discharged from the second pump (22) is supplied to the contracted portion (92) of the hydraulic cylinder (90).

When the expansion valve (32) is closed and the expansion valve (35) is opened, the hydraulic pressure located in the expansion portion (91) of the hydraulic cylinder (90) flows through the expansion drain pipe (13).

As described above, since the expansion operation and the export operation of the hydraulic cylinder 90 are realized by the combination of the four valves, when a separate control device is added and controlled simultaneously, if necessary, (90).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, And all of the various forms of embodiments that can be practiced without departing from the technical spirit.

10: Case 11: Front panel
13: Oil tank 14: Wheel
21: first pump 22: second pump
30: Actuation part 31: Expansion duct
32: Pyeongchang actuated valve 33: Pyeongchang pressure gauge
34: Pyeongchang drain pipe 35: Expansion drain valve
40: shrinking operation part 41: shrinking pipe
42: retraction actuating valve 43: retraction pressure gauge
44: shrinkage drain line 45: shrinkage drain valve
81: expansion coupler 82: shrinkage coupler
90: Hydraulic cylinder 91: Expansion part
92: contraction portion 93: supply pipe
100: Pump system for loading device

Claims (6)

delete A pumping system for a load device used in a load device to which a load is applied for measuring a bearing capacity of a pile for civil engineering construction,
A hydraulic cylinder in which a load is repeatedly applied to a pile and the piston moves in a direction in which the stroke expands when the hydraulic pressure is supplied to the expansion portion and the piston moves in a direction in which the piston contracts the stroke when the hydraulic pressure is supplied to the contraction portion;
case;
An oil tank attached to the lower end of the case and containing oil for generating hydraulic pressure;
A first pump for sucking and compressing oil in the oil tank;
A second pump for raising the hydraulic pressure discharged from the first pump;
An expansion operation unit that supplies the hydraulic pressure discharged from the second pump to the expansion unit and guides the hydraulic pressure fed back from the expansion unit to the oil tank; And
And a shrinking operation part that supplies the oil pressure discharged from the second pump to the shrinkage part and guides the oil pressure returning from the shrinkage part to the oil tank,
Wherein the expansion operation portion comprises:
An expansion pipe connected to the discharge port of the second pump;
An expansion operation valve for opening and closing the expansion pipe;
An expansion drain pipe branched from the expansion pipe after the expansion operation valve and communicating with the oil tank;
An expansion drain valve for opening and closing the expansion drain line;
An expansion coupler attached to an end of the expansion pipe; And
And a supply conduit communicating the expansion coupler and the expansion unit.
[3] The apparatus according to claim 2,
A contraction pipe connected to the discharge port of the second pump;
A contraction actuating valve for opening and closing the contraction conduit;
A shrink drain pipe branched from the shrink duct after the shrink actuating valve and communicating with the oil tank;
A shrink drain valve for opening and closing the shrink drain pipe;
A shrinkable coupler attached to an end of the shrink duct; And
And a supply pipe communicating the shrinkage coupler and the shrinkage portion.
4. The inflator according to claim 3, wherein the expansion operation portion further includes an inflation pressure gauge for sensing a hydraulic pressure inside the expansion pipe,
Wherein the shrinking operation part further comprises a shrinkage pressure gauge for sensing a hydraulic pressure inside the shrinking pipe.
5. The pump system according to claim 4, wherein the expansion operation valve, the expansion drain valve, the shrinking operation valve, the shrinkage drain valve, the expansion pressure gauge, and the shrinkage pressure gauge are installed on the front panel formed on the front surface of the case.
The hydraulic control apparatus according to claim 4, wherein when the expansion operation valve is opened, the shrinking operation valve is closed, the expansion drain valve is closed, and the shrinkage drain valve is opened, hydraulic pressure is supplied to the expansion portion, The hydraulic pressure returns and the stroke of the hydraulic cylinder expands,
When the expansion operation valve is closed, the shrinking operation valve is opened, the expansion drain valve is opened, and the shrinkage drain valve is closed, the hydraulic pressure is supplied to the shrinkage portion, and the hydraulic pressure of the expansion portion is returned And the stroke of the hydraulic cylinder is contracted.
KR1020150078868A 2015-06-03 2015-06-03 Pump system for high pressure loading device KR101705883B1 (en)

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KR1020150078868A KR101705883B1 (en) 2015-06-03 2015-06-03 Pump system for high pressure loading device

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Application Number Priority Date Filing Date Title
KR1020150078868A KR101705883B1 (en) 2015-06-03 2015-06-03 Pump system for high pressure loading device

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KR101705883B1 true KR101705883B1 (en) 2017-02-10

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100790364B1 (en) * 2006-07-04 2008-01-02 울산대학교 산학협력단 The active load simulator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06179015A (en) * 1992-12-14 1994-06-28 Kawasaki Steel Corp Automatic air bleeding method in starting time of two stage booster type high pressure water supply system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100790364B1 (en) * 2006-07-04 2008-01-02 울산대학교 산학협력단 The active load simulator

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