CN108999843A - Fall width hydraulic system and crane - Google Patents
Fall width hydraulic system and crane Download PDFInfo
- Publication number
- CN108999843A CN108999843A CN201811042179.1A CN201811042179A CN108999843A CN 108999843 A CN108999843 A CN 108999843A CN 201811042179 A CN201811042179 A CN 201811042179A CN 108999843 A CN108999843 A CN 108999843A
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- Prior art keywords
- oil
- valve
- oil circuit
- hydraulic
- circuit
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/82—Luffing 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention provides one kind to fall width hydraulic system and crane, it is related to its technical field of crane equipment, the width hydraulic system provided by the invention that falls includes: amplitude oil cylinder, reversal valve and overflow valve, reversal valve is connected to by the first oil circuit with the rod chamber of amplitude oil cylinder, and reversal valve is connected to by the second oil circuit with the rodless cavity of amplitude oil cylinder；Overflow valve is connected to the first oil circuit and oil return box respectively by overflow oil circuit.It is provided by the invention fall width hydraulic system and alleviate the relevant technologies decline width hydraulic system fall during width the technical issues of generating shake.
Description
Technical field
The present invention relates to technical field of crane equipment, falls width system and crane more particularly, to one kind.
Background technique
Current small tonnage autocrane changing-breadth system falls width mode using power, by adding in amplitude oil cylinder rod chamber
Pressure, balanced valve control the source pressure hydraulic oil that rod chamber is passed through when falling width, and control balanced valve openings of sizes realizes speed regulation.
When autocrane falls width movement, hydraulic oil enters the rod chamber of amplitude oil cylinder by reversal valve, pushes away simultaneously
Dynamic luffing balance valve core is mobile, and the valve port of balanced valve is opened, and amplitude oil cylinder rodless cavity falls width by reversal valve oil return, realization.
Overflow valve plays safe valve action, falls amplitude velocity degree by balanced valve and adjusts the speed realization.
The width hydraulic system that falls in the related technology has the following problems:
1, it falls width unlatching and easily causes instantaneous stall, rod chamber oil circuit pressure moment reduces at this time, controls oil circuit decompression, balance
Valve main valve plug opening reduces, and falls the reduction of amplitude velocity degree, and rod chamber fuel feeding is sufficient, control oil circuit boosting, and spool is open increase suddenly, from
And generate lasting shake.
2, balanced valve needs to realize speed regulation, and the valve core structure of balanced valve is complicated, and stroke is long, and manufacturing cost is high.
Summary of the invention
The purpose of the present invention includes providing one kind to fall width hydraulic system, falls width to alleviate the relevant technologies decline width hydraulic system
The technical issues of generating shake in the process.
The width hydraulic system provided by the invention that falls includes: amplitude oil cylinder, reversal valve and overflow valve, and the reversal valve passes through the
One oil circuit is connected to the rod chamber of the amplitude oil cylinder, and the reversal valve passes through the rodless cavity of the second oil circuit and the amplitude oil cylinder
Connection；
The overflow valve is connected to first oil circuit and oil return box respectively by overflow oil circuit.
Optionally, the first hydraulic fluid port of the reversal valve and first oil communication, the second hydraulic fluid port of the reversal valve with
Second oil communication, the third hydraulic fluid port of the reversal valve and the 4th hydraulic fluid port of the reversal valve are connected to fuel tank.
Optionally, the reversal valve is hand-operated direction valve.
Optionally, the reversal valve is three-position four-way valve.
Optionally, the width hydraulic system that falls further includes balanced component, and the balanced component is set to second oil circuit simultaneously
With first oil communication.
Optionally, the balanced component includes luffing balanced valve, the luffing balanced valve be set to second oil circuit, and with
First oil communication；
Balance valve core is equipped in the luffing balanced valve, the hydraulic oil in first oil circuit to the balance valve core the
One end generates active force, and the elastic component in hydraulic oil and the luffing balanced valve in second oil circuit is to the balance valve core
Second end generate active force.
Optionally, there is the first cavity and the second cavity, first cavity and described first in the luffing balanced valve
Oil communication, second cavity and second oil communication, the balance valve core are used for first cavity and described
The isolation of second cavity.
Optionally, the balanced component includes hydraulic control one-way valve, the hydraulic control one-way valve be set to second oil circuit, and with
First oil communication；
The openable hydraulic control one-way valve of the hydraulic oil in hydraulic oil and second oil circuit in first oil circuit.
The purpose of the present invention includes providing one kind to fall width control method, comprising:
By reversal valve control the first oil circuit be oil inlet oil circuit, the second oil circuit be oil return circuit, alternatively, the second oil circuit be into
Oil circuit, the first oil circuit are oil return circuit；
Amplitude velocity degree is fallen by the spool adjusting of adjustable change valve.
The purpose of the present invention further includes providing a kind of crane, falls width hydraulic system including above-mentioned.
The width hydraulic system provided by the invention that falls includes: amplitude oil cylinder, reversal valve and overflow valve, and reversal valve passes through the first oil
Road is connected to the rod chamber of amplitude oil cylinder, and reversal valve is connected to by the second oil circuit with the rodless cavity of amplitude oil cylinder；Overflow valve passes through
Overflow oil circuit is connected to the first oil circuit and oil return box respectively.Change hydraulic oil in the first oil circuit and the second oil circuit by reversal valve
Flow direction and flow；Adjustable change valve when falling width, the first oil circuit are oil inlet oil circuit, and the second oil circuit is oil return circuit, reversal valve
Spool when opening to the maximum position, the pressure in the first oil circuit is equal to the oil pressure relief of overflow valve, passes through opening for control reversal valve
Mouth size controls the flow of the hydraulic oil in the first oil circuit, so that control falls amplitude velocity degree, it is unrelated with load.
Detailed description of the invention
Technical solution in order to illustrate more clearly of the specific embodiment of the invention or in the related technology, below will be to specific
Attached drawing needed in embodiment or description of Related Art is briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram one provided in an embodiment of the present invention for falling width hydraulic system；
Fig. 2 is the structural schematic diagram two provided in an embodiment of the present invention for falling width hydraulic system.
Icon: 100- amplitude oil cylinder；200- reversal valve；300- overflow valve；The first oil circuit of 400-；The second oil of 500-
Road；600- luffing balanced valve；700- hydraulic control one-way valve；The first hydraulic fluid port of V1-；The second hydraulic fluid port of V2-；P- third hydraulic fluid port；T-
4th hydraulic fluid port.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The width hydraulic system provided in an embodiment of the present invention that falls includes: amplitude oil cylinder 100, reversal valve 200 and overflow valve 300,
Reversal valve 200 be connected to by the first oil circuit 400 with the rod chamber of amplitude oil cylinder 100, reversal valve 200 pass through the second oil circuit 500 and
The rodless cavity of amplitude oil cylinder 100 is connected to；
Overflow valve 300 is connected to the first oil circuit 400 and oil return box respectively by overflow oil circuit.
Specifically, reversal valve 200 has the first hydraulic fluid port V1, the second hydraulic fluid port V2, third hydraulic fluid port P and the 4th hydraulic fluid port T, reversal valve
200 the first hydraulic fluid port V1 is connected to the first oil circuit 400, and the second hydraulic fluid port V2 of reversal valve 200 is connected to the second oil circuit 500, commutation
The third hydraulic fluid port P of valve 200 and the 4th hydraulic fluid port T of reversal valve 200 are connected to fuel tank.
Optionally, reversal valve 200 is hand-operated direction valve 200.
The manually adjustable reversal valve 200 of operator changes the state of hydraulic oil in the first oil circuit 400 and the second oil circuit 500,
To realize that adjusting falls width hydraulic system.
Optionally, reversal valve 200 is three-position four-way valve.
Operator can pass through the first hydraulic fluid port of position change V1 of adjusting spool, the second hydraulic fluid port V2, the oil of third hydraulic fluid port P and the 4th
The connection and disconnection of mouth T, to change the flow regime of hydraulic oil in the first oil circuit 400 and the second oil circuit 500, thus real
The now adjusting to width hydraulic system is fallen.
Optionally, falling width hydraulic system further includes balanced component, balanced component be set to the second oil circuit 500 and with the first oil circuit
400 connections.
Specifically, balanced component is connected to the first oil circuit 400 and the second oil circuit 500 respectively, the hydraulic oil in rodless cavity is logical
Then overbalance component flows into reversal valve 200, the hydraulic oil in hydraulic oil and the second oil circuit 500 in the first oil circuit 400 is right
Balanced component generates active force.Balanced component balances the first oil circuit 400 and the second oil circuit 500, improves stability when falling width.
As shown in Figure 1, balanced component includes luffing balanced valve 600, luffing balanced valve 600 is set to the second oil circuit 500, and with
The connection of first oil circuit 400；
Balance valve core is equipped in luffing balanced valve 600, the hydraulic oil in the first oil circuit 400 produces the first end of balance valve core
Active force is given birth to, the elastic component in hydraulic oil and luffing balanced valve 600 in the second oil circuit 500 generates the second end of balance valve core
Active force.
Specifically, luffing balanced valve 600 has shell and balance valve core, balance valve core can move in shell, the first oil
Road 400 is connected to enclosure interior, and the hydraulic oil in the first oil circuit 400 generates active force to the first end face of balance valve core；
Second oil circuit 500 is connected to shell, and the hydraulic oil in the second oil circuit 500 flows into reversal valve 200 by shell, and reversal valve 200 returns
Oil throttling generates active force to the second end face of balance valve core；Spring, spring pair are equipped between balance valve core and the inner wall of shell
The second end face of balance valve core generates active force.
It falls during width, reversal valve 200 is adjusted to leftmost bit, and the hydraulic fluid pressure in the first oil circuit 400 directly rises to
The oil pressure relief Pc of overflow valve 300,600 standard-sized sheet of luffing balanced valve, 200 meter out of reversal valve effect generate corresponding back pressure
Pa.The pressure of 600 first end face of luffing balanced valve reaches the main valve plug spring force Ft of luffing balanced valve 600 and hand is returned to valve 200
When the resultant force of oily back pressure Pa, the balance valve core of luffing balanced valve 600 reaches mechanical balance:
Pc × A=Ft+Pa × A has this that can obtain；
Pa=Pc-Ft/A
Wherein overflow valve 300 plays pressure stabilizing valve action, sets pressure Pc as definite value, the Pa known to above-mentioned calculating is definite value.
Flow in first oil circuit 400 are as follows:
Wherein, Q is the flow in the first oil circuit 400；
C is discharge coefficient；
ApFor the meter out area of reversal valve 200, determined by the spool position of reversal valve 200；
ρ is the density of hydraulic oil.
The flow of hydraulic oil is determined by the meter out area of reversal valve 200 in first oil circuit 400, unrelated with load, because
This, can be controlled by the spool position of adjustable change valve 200 and fall amplitude velocity degree.
Optionally, there is the first cavity and the second cavity, the first cavity and the first oil circuit 400 connect in luffing balanced valve 600
Logical, the second cavity is connected to the second oil circuit 500, and balance valve core is used to for the first cavity and the second cavity being isolated.
Hydraulic oil in first oil circuit 400 enters the first cavity and generates active force to the first end face of balance valve core；Luffing
Hydraulic oil in the rodless cavity of oil cylinder 100 flows back into reversal valve 200 by the second cavity, and 200 meter out of reversal valve effect produces
In the second end face of balance valve core, spring is located in the second cavity raw corresponding back pressure effect, right when spring generates flexible deformation
The second end face of balance valve core generates active force；The power that balance valve core is subject to according to both ends is between the first cavity and the second cavity
It is mobile, the balance in the first oil circuit 400 and the second oil circuit 500 is adjusted, makes to fall more stable.
Optionally, balanced component includes hydraulic control one-way valve 700, and hydraulic control one-way valve 700 is set to the second oil circuit 500, and with the
The connection of one oil circuit 400；
The openable hydraulic control one-way valve 700 of the hydraulic oil in hydraulic oil and the second oil circuit 500 in first oil circuit 400.
As shown in Fig. 2, the hydraulic oil in the first oil circuit 400 can enter hydraulic control one-way valve 700, make hydraulic control one-way valve 700
Spool is opened；Alternatively, opening the spool of hydraulic control one-way valve 700 when the hydraulic oil in the second oil circuit 500 flows from bottom to top.
Hydraulic control one-way valve 700 balances the first oil circuit 400 and the second oil circuit 500, improves the stability for falling width.
The purpose of the embodiment of the present invention includes providing one kind to fall width control method, comprising:
Controlling the first oil circuit 400 by reversal valve 200 is oil inlet oil circuit, and the second oil circuit 500 is oil return circuit, alternatively, the
Two oil circuits 500 are oil inlet oil circuit, and the second oil circuit 500 is oil return circuit；
Amplitude velocity degree is fallen by the spool adjusting of adjustable change valve 200.
Specifically, the spool of reversal valve 200 is located at left position when falling width, the first oil circuit 400 is oil inlet oil circuit, the second oil circuit
500 be oil return circuit；When the hydraulic stem of amplitude oil cylinder 100 being needed to move upwards, the spool of reversal valve 200 is located at right position, the second oil
Road 500 is oil inlet oil circuit, and the first oil circuit 400 is oil return circuit；When hydraulic stem being needed to keep balance, the spool of reversal valve 200 is located at
Middle position, the first oil circuit 400 and the second oil circuit 500 are oil inlet oil circuit.When falling width, pass through the throttling of adjustable change valve 200
Area, adjust fall width hydraulic system fall amplitude velocity degree, improve the stability for falling width.
The purpose of the embodiment of the present invention further includes providing a kind of crane, falls width hydraulic system including above-mentioned.
Specifically, the hydraulic width system that falls when crane carries out falling width operation, is adjusted in crane by reversal valve 200
Section falls amplitude velocity degree, improves the stability for falling width.
The width hydraulic system provided in an embodiment of the present invention that falls includes: amplitude oil cylinder 100, reversal valve 200 and overflow valve 300,
Reversal valve 200 be connected to by the first oil circuit 400 with the rod chamber of amplitude oil cylinder 100, reversal valve 200 pass through the second oil circuit 500 and
The rodless cavity of amplitude oil cylinder 100 is connected to；Overflow valve 300 is connected to the first oil circuit 400 and oil return box respectively by overflow oil circuit.It is logical
It crosses reversal valve 200 and changes the flow direction of hydraulic oil and flow in the first oil circuit 400 and the second oil circuit 500；It adjusts and changes when falling width
To valve 200, the first oil circuit 400 is oil inlet oil circuit, and the second oil circuit 500 is oil return circuit, and the spool of reversal valve 200 opens to the maximum position
When setting, the pressure in the first oil circuit 400 is equal to the oil pressure relief of overflow valve 300, by the openings of sizes control for controlling reversal valve 200
The flow of the hydraulic oil in the first oil circuit 400 is made, so that control falls amplitude velocity degree, it is unrelated with load.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. one kind falls width hydraulic system characterized by comprising amplitude oil cylinder, reversal valve and overflow valve, the reversal valve pass through
First oil circuit is connected to the rod chamber of the amplitude oil cylinder, and the reversal valve is by the second oil circuit with the amplitude oil cylinder without bar
Chamber connection；
The overflow valve is connected to first oil circuit and oil return box respectively by overflow oil circuit.
2. according to claim 1 fall width hydraulic system, which is characterized in that the first hydraulic fluid port of the reversal valve and described the
One oil communication, the second hydraulic fluid port of the reversal valve and second oil communication, the third hydraulic fluid port of the reversal valve and described
4th hydraulic fluid port of reversal valve is connected to fuel tank.
3. according to claim 2 fall width hydraulic system, which is characterized in that the reversal valve is hand-operated direction valve.
4. according to claim 3 fall width hydraulic system, which is characterized in that the reversal valve is three-position four-way valve.
5. according to claim 1 fall width hydraulic system, which is characterized in that the width hydraulic system that falls further includes balance group
Part, the balanced component be set to second oil circuit and with first oil communication.
6. according to claim 5 fall width hydraulic system, which is characterized in that the balanced component includes luffing balanced valve,
The luffing balanced valve be set to second oil circuit, and with first oil communication；
Balance valve core is equipped in the luffing balanced valve, first end of the hydraulic oil in first oil circuit to the balance valve core
Generate active force, the elastic component in hydraulic oil and the luffing balanced valve in second oil circuit to the balance valve core the
Two ends generate active force.
7. according to claim 6 fall width hydraulic system, which is characterized in that have the first cavity in the luffing balanced valve
With the second cavity, first cavity and first oil communication, second cavity and second oil communication are described
Balance valve core is used to for first cavity and second cavity being isolated.
8. according to claim 5 fall width hydraulic system, which is characterized in that the balanced component includes hydraulic control one-way valve,
The hydraulic control one-way valve be set to second oil circuit, and with first oil communication；
The openable hydraulic control one-way valve of the hydraulic oil in hydraulic oil and second oil circuit in first oil circuit.
9. one kind falls width control method characterized by comprising
Controlling the first oil circuit by reversal valve is oil inlet oil circuit, and the second oil circuit is oil return circuit, alternatively, the second oil circuit is oil inlet oil
Road, the first oil circuit are oil return circuit；
Amplitude velocity degree is fallen by the spool adjusting of adjustable change valve.
10. a kind of crane, which is characterized in that fall width hydraulic system including claim 1-8 is described in any item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811042179.1A CN108999843B (en) | 2018-09-07 | 2018-09-07 | Amplitude falling hydraulic system and crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811042179.1A CN108999843B (en) | 2018-09-07 | 2018-09-07 | Amplitude falling hydraulic system and crane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108999843A true CN108999843A (en) | 2018-12-14 |
| CN108999843B CN108999843B (en) | 2020-09-29 |
Family
ID=64591252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811042179.1A Active CN108999843B (en) | 2018-09-07 | 2018-09-07 | Amplitude falling hydraulic system and crane |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108999843B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005475A1 (en) * | 2021-07-30 | 2023-02-02 | 三一汽车起重机械有限公司 | Falling control method and system, and crane |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2352742A1 (en) * | 1972-11-09 | 1974-05-22 | Beringer Hydraulik Gmbh | HYDRAULIC LOWERING BRAKE LOCKING VALVE |
| DE3420890C2 (en) * | 1984-06-05 | 1993-09-16 | Westfalia Becorit Industrietechnik Gmbh, 44534 Luenen, De | |
| CN2625680Y (en) * | 2003-07-04 | 2004-07-14 | 天津特精液压股份有限公司 | Plug-in mounting straight moving type dual-purpose safety valve controlling balance inside and outside |
| CN101634317A (en) * | 2009-08-21 | 2010-01-27 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN104879334A (en) * | 2015-04-23 | 2015-09-02 | 凯迈（洛阳）测控有限公司 | Piston lifting mechanism and hydraulic control device thereof |
| CN205187683U (en) * | 2015-11-20 | 2016-04-27 | 徐州重型机械有限公司 | Hoist, jib loading boom system and hydraulic control system |
| CN107781250A (en) * | 2016-08-29 | 2018-03-09 | 何志杰 | Novel load sensitive balance valve |
-
2018
- 2018-09-07 CN CN201811042179.1A patent/CN108999843B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2352742A1 (en) * | 1972-11-09 | 1974-05-22 | Beringer Hydraulik Gmbh | HYDRAULIC LOWERING BRAKE LOCKING VALVE |
| DE3420890C2 (en) * | 1984-06-05 | 1993-09-16 | Westfalia Becorit Industrietechnik Gmbh, 44534 Luenen, De | |
| CN2625680Y (en) * | 2003-07-04 | 2004-07-14 | 天津特精液压股份有限公司 | Plug-in mounting straight moving type dual-purpose safety valve controlling balance inside and outside |
| CN101634317A (en) * | 2009-08-21 | 2010-01-27 | 宁波汉商液压有限公司 | Plug-in type balance valve |
| CN104879334A (en) * | 2015-04-23 | 2015-09-02 | 凯迈（洛阳）测控有限公司 | Piston lifting mechanism and hydraulic control device thereof |
| CN205187683U (en) * | 2015-11-20 | 2016-04-27 | 徐州重型机械有限公司 | Hoist, jib loading boom system and hydraulic control system |
| CN107781250A (en) * | 2016-08-29 | 2018-03-09 | 何志杰 | Novel load sensitive balance valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005475A1 (en) * | 2021-07-30 | 2023-02-02 | 三一汽车起重机械有限公司 | Falling control method and system, and crane |
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| Publication number | Publication date |
|---|---|
| CN108999843B (en) | 2020-09-29 |
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