CN103469847A - Emergency falling system of movable arm of loader - Google Patents

Emergency falling system of movable arm of loader Download PDF

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Publication number
CN103469847A
CN103469847A CN2013104415201A CN201310441520A CN103469847A CN 103469847 A CN103469847 A CN 103469847A CN 2013104415201 A CN2013104415201 A CN 2013104415201A CN 201310441520 A CN201310441520 A CN 201310441520A CN 103469847 A CN103469847 A CN 103469847A
Authority
CN
China
Prior art keywords
valve
falling
communicated
boom cylinder
lowering
Prior art date
Application number
CN2013104415201A
Other languages
Chinese (zh)
Inventor
江林
陈露美
Original Assignee
镇江金天辰新材料有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 镇江金天辰新材料有限公司 filed Critical 镇江金天辰新材料有限公司
Priority to CN2013104415201A priority Critical patent/CN103469847A/en
Publication of CN103469847A publication Critical patent/CN103469847A/en

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Abstract

The invention discloses an emergency falling system of a movable arm of a loader. The system comprises a falling valve and a pressure reducing valve, wherein the falling valve comprises a cut-off station and a communication station, the upstream of the falling valve is communicated with a lifting cavity of a boom cylinder, and the downstream of the falling valve is communicated with the falling control end of a control valve of the boom cylinder through the pressure reducing valve. Through introducing oil in the lifting cavity of the movable arm into the falling end of the control valve through the falling valve and the pressure reducing valve, emergency falling of the movable arm is realized, so that the structure is simple, and the cost is very low.

Description

The loading arm descending system of meeting an urgent need

Technical field

The present invention relates to the emergent descending system of a kind of swing arm, particularly relate to the emergent descending system of a kind of loading arm, belong to technical field of engineering machinery.

Background technology

The power resources of loader are motors, its operation mainly drives equipment to realize by hydraulic jack, swing arm is one of critical piece of equipment, swing arm is driven by boom cylinder, realize lifting and decline, and the control of the controlled valve of boom cylinder, the control mode of its control valve is divided into mechanical type usually, hydraulically-controlled type and electric-controlled type, the hydraulic control control valve is the major control mode of Foreign Loader control valve at present, but hydraulically-controlled type needs high-voltage oil liquid to realize, when engine shutdown for example breaks down or fuel consumption complete after, can not provide for controlling the hydraulic oil of control valve, if now swing arm is in the lifting state, swing arm can not be descended, like this can be abnormally dangerous, this just needs, and swing arm is emergent to descend, at present a lot of loaders all are equipped with the emergent descending system of swing arm, the main accumulator that adopts, in when hydraulic system works, high-voltage oil liquid being introduced to accumulator, when the system cisco unity malfunction, the hydraulic oil stored in accumulator is emitted for control valve, but due to problems such as system leaks, hydraulic oil in accumulator will leak after after a while, now can't re-use, and adopt accumulator also to need to add charging device, cause system complex, cost is high, fault rate is also high.

Summary of the invention

The purpose of this invention is to provide the emergent descending system of a kind of swing arm, to solve complete machine in the situation that engine shutdown still can be realized the decline of swing arm, native system is more simple in structure than the emergent descending system of existing accumulator, and cost is low.

Technical scheme: a kind of loading arm descending system of meeting an urgent need, comprise lowering valve and reducing valve, described lowering valve comprises the cut-off position and is communicated with position, described lowering valve upstream is communicated with the lifting chamber of boom cylinder, and the downstream of described lowering valve is communicated with the decline manipulatable end of the control valve of controlling described boom cylinder by described reducing valve.

Lowering valve is transformed into and is communicated with position from the cut-off position, effect due to the swing arm deadweight, the fluid of moved arm lifting chamber pressurized will flow to by lowering valve and reducing valve the decline end of the control valve of controlling boom cylinder, make control valve in the position that descends, now the lifting chamber of boom cylinder is communicated with fuel tank, and swing arm will descend under Gravitative Loads.

The downstream of described reducing valve is provided with handle.Emergent like this decline is just to be subject to the control of handle more to meet the manipulation custom.

But after adding handle, reliability will descend, in order to improve reliability, make the swing arm smooth decreasing controlled simultaneously, the provided upstream of described lowering valve is equipped with the first throttle valve.

The downstream of described lowering valve, the upstream of described reducing valve are communicated with the decline chamber of described boom cylinder by oil circuit.The fluid in boom cylinder lifting chamber can be added to the decline chamber like this, the chamber of avoiding descending produces negative pressure.

Described oil circuit is provided with the second choke valve.Can avoid like this swing arm to descend too fast.

The present invention, by the fluid in moved arm lifting chamber is introduced to the decline end of control valve by lowering valve and reducing valve, realizes the emergent decline of swing arm, and simple in structure, cost is very low.

The accompanying drawing explanation

The schematic diagram that Fig. 1 is the embodiment of the present invention one;

The schematic diagram that Fig. 2 is the embodiment of the present invention two;

The schematic diagram that Fig. 3 is the embodiment of the present invention three;

The schematic diagram that Fig. 4 is the embodiment of the present invention four.

The specific embodiment

Below in conjunction with drawings and Examples, the invention will be further described:

Embodiment mono-:

As shown in Figure 1, a kind of loading arm descending system of meeting an urgent need, comprise lowering valve and reducing valve, described lowering valve comprises the cut-off position and is communicated with position, described lowering valve upstream is communicated with the lifting chamber of boom cylinder, and the downstream of described lowering valve is communicated with the decline manipulatable end of the control valve of controlling described boom cylinder by described reducing valve.

Embodiment bis-:

On the basis of embodiment mono-, the downstream of described reducing valve is provided with handle.

Embodiment tri-:

On the basis of embodiment mono-, the upstream of described lowering valve also is provided with the first throttle valve.

Embodiment tetra-:

On the basis of embodiment tri-, the downstream of described lowering valve, the upstream of described reducing valve is communicated with the decline chamber of described boom cylinder by oil circuit, and described oil circuit is provided with the second choke valve.

In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of requirement of the present invention.

Claims (5)

1. the emergent descending system of a loading arm, comprise lowering valve (1) and reducing valve (2), it is characterized in that: described lowering valve (1) comprises the cut-off position and is communicated with position, described lowering valve (1) upstream is communicated with the lifting chamber of boom cylinder (3), and the downstream of described lowering valve (1) is communicated with the decline manipulatable end of the control valve (4) of controlling described boom cylinder (3) by described reducing valve (2).
2. the emergent descending system of a kind of loading arm as claimed in claim 1, it is characterized in that: the downstream of described reducing valve (2) is provided with handle (5).
3. the emergent descending system of a kind of loading arm as claimed in claim 1, it is characterized in that: the upstream of described lowering valve (1) also is provided with first throttle valve (6).
4. descending system as emergent as a kind of loading arm as described in claim 1 or 2 or 3, it is characterized in that: the upstream of the downstream of described lowering valve (1), described reducing valve (2) is communicated with the decline chamber of described boom cylinder (3) by oil circuit (7).
5. the emergent descending system of a kind of loading arm as claimed in claim 4, it is characterized in that: described oil circuit (7) is provided with the second choke valve (8).
CN2013104415201A 2013-09-26 2013-09-26 Emergency falling system of movable arm of loader CN103469847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013104415201A CN103469847A (en) 2013-09-26 2013-09-26 Emergency falling system of movable arm of loader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013104415201A CN103469847A (en) 2013-09-26 2013-09-26 Emergency falling system of movable arm of loader

Publications (1)

Publication Number Publication Date
CN103469847A true CN103469847A (en) 2013-12-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013104415201A CN103469847A (en) 2013-09-26 2013-09-26 Emergency falling system of movable arm of loader

Country Status (1)

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CN (1) CN103469847A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105525641A (en) * 2016-01-25 2016-04-27 徐州徐工特种工程机械有限公司 Movable arm dropping hydraulic system used for skid steer loader in case of flameout
CN107299655A (en) * 2017-08-09 2017-10-27 太原科技大学 A kind of swing arm decrease speed control loop of excavator

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903145A (en) * 1957-04-04 1959-09-08 Sherman Products Inc Valve control
CN201050076Y (en) * 2007-06-15 2008-04-23 龙工(上海)机械制造有限公司 Lead operation valve oil supplying system
CN101775822A (en) * 2009-12-31 2010-07-14 福田雷沃国际重工股份有限公司 Excavator swing arm descending hydraulic control loop
CN102216532A (en) * 2008-11-19 2011-10-12 斗山英维高株式会社 Boom cylinder control circuit for construction machine
CN102304931A (en) * 2011-03-15 2012-01-04 陈海波 Hydraulic energy-saving control system and method for loader movable arm
CN102966132A (en) * 2012-12-04 2013-03-13 山河智能装备股份有限公司 Swing arm descending control loop of hydraulic excavator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903145A (en) * 1957-04-04 1959-09-08 Sherman Products Inc Valve control
CN201050076Y (en) * 2007-06-15 2008-04-23 龙工(上海)机械制造有限公司 Lead operation valve oil supplying system
CN102216532A (en) * 2008-11-19 2011-10-12 斗山英维高株式会社 Boom cylinder control circuit for construction machine
CN101775822A (en) * 2009-12-31 2010-07-14 福田雷沃国际重工股份有限公司 Excavator swing arm descending hydraulic control loop
CN102304931A (en) * 2011-03-15 2012-01-04 陈海波 Hydraulic energy-saving control system and method for loader movable arm
CN102966132A (en) * 2012-12-04 2013-03-13 山河智能装备股份有限公司 Swing arm descending control loop of hydraulic excavator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105525641A (en) * 2016-01-25 2016-04-27 徐州徐工特种工程机械有限公司 Movable arm dropping hydraulic system used for skid steer loader in case of flameout
CN107299655A (en) * 2017-08-09 2017-10-27 太原科技大学 A kind of swing arm decrease speed control loop of excavator

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Application publication date: 20131225

C02 Deemed withdrawal of patent application after publication (patent law 2001)