CN110778575A - Energy-saving device of crane load sensing system - Google Patents

Energy-saving device of crane load sensing system Download PDF

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Publication number
CN110778575A
CN110778575A CN201911208908.0A CN201911208908A CN110778575A CN 110778575 A CN110778575 A CN 110778575A CN 201911208908 A CN201911208908 A CN 201911208908A CN 110778575 A CN110778575 A CN 110778575A
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CN
China
Prior art keywords
valve
port
communicated
electromagnetic valve
load sensing
Prior art date
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Pending
Application number
CN201911208908.0A
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Chinese (zh)
Inventor
王开宇
徐青山
孙玉魁
徐尚国
李劼人
田善玉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Liugong Crane Co Ltd
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Anhui Liugong Crane Co Ltd
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Publication date
Application filed by Anhui Liugong Crane Co Ltd filed Critical Anhui Liugong Crane Co Ltd
Priority to CN201911208908.0A priority Critical patent/CN110778575A/en
Publication of CN110778575A publication Critical patent/CN110778575A/en
Pending legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08Servomotor systems incorporating electrically operated control means
    • F15B21/087Control strategy, e.g. with block diagram
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/18Control systems or devices
    • B66C13/20Control systems or devices for non-electric drives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/52Details of compartments for driving engines or motors or of operator's stands or cabins
    • B66C13/54Operator's stands or cabins
    • B66C13/56Arrangements of handles or pedals
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors

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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)
  • Automation & Control Theory (AREA)
  • Control And Safety Of Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

The invention provides an energy-saving device of a crane load sensing system, wherein a load sensing main valve is connected with an execution element through an oil way, and a three-way flow valve is arranged between a constant delivery pump and an oil tank; an electromagnetic valve and a cartridge valve are arranged between the fixed displacement pump and the oil tank, a first reversing port of the electromagnetic valve is communicated with the fixed displacement pump, a second reversing port of the electromagnetic valve is communicated with the oil tank, a third reversing port of the electromagnetic valve is communicated with a control oil port of the cartridge valve, a fourth reversing port of the electromagnetic valve is communicated with the oil tank, and the electromagnetic valve is controlled by a handle opening enabling signal of a crane handle; a first working oil port of the cartridge valve is communicated with the fixed displacement pump, and a second working oil port of the cartridge valve is communicated with an oil tank. The energy-saving device has the beneficial technical effects that: the energy-saving problem of the constant delivery pump matched with the load sensitive valve can be solved; the practicability is better without increasing the cost.

Description

Energy-saving device of crane load sensing system
Technical Field
The invention relates to an energy-saving device of a crane load sensing system.
Background
The load sensing system is generally used as a main hydraulic driving technical route of modern medium-large tonnage cranes, the main realization mode of the load sensing technology is to utilize a load sensing main valve to work together with a load sensing pump, and a load signal (namely an LS signal) is obtained to be used as a control signal to ensure that the load flow is supplied with oil in proportion to the opening of the main valve by utilizing a pressure compensation principle. With the popularization of load sensing technology, at present, a load sensing system begins to popularize to a fixed displacement pump, and a load sensing valve or the fixed displacement pump can also realize basic functions on the fixed displacement pump through a three-way flow valve on a load sensing main valve.
As shown in fig. 1, in the prior art, a port P of a metering pump 1 and a port T of an oil tank of a crane load sensing system are respectively communicated with two groups of load sensing main valves through oil passages, the two groups of load sensing main valves are respectively a first load sensing main valve 2 and a second load sensing main valve 3, the first load sensing main valve 2 is further provided with a first compensation valve 21 in a matching manner, the second load sensing main valve 3 is further provided with a second compensation valve 31 in a matching manner, the first load sensing main valve 2 is connected with a crane winch through an oil passage, the second load sensing main valve 3 is connected with a telescopic oil cylinder through an oil passage, a three-way flow valve 4 is arranged between the port P of the metering pump 1 and the port T of the oil tank, a spring force is preset in the three-way flow valve 4, and a pilot pressure signal is sent to the first load sensing main valve.
The prior load sensitive valve and the dosing pump generally depend on a three-way flow valve to carry out middle position reflux when the valve does not work: the three-way flow valve generally consumes energy, oil output by the pump needs to overcome the spring force when the main valve does not work, the crane belongs to engineering machinery, the working density is low, particularly, standby operation is often needed when installation and other operations are carried out, the standby time is long, and due to the inherent characteristic of the constant delivery pump, a part of useless work needs to be overcome and finally the useless work is released in a heat mode, so that the oil consumption is increased invisibly.
Disclosure of Invention
The invention aims to solve the technical problem of providing an energy-saving device of a crane load sensitive system, which has a reasonable structure and reduces the oil consumption.
In order to solve the technical problems, the invention provides an energy-saving device of a crane load sensing system, a constant delivery pump of the crane load sensing system is respectively communicated with a plurality of load sensing main valves through oil paths, the load sensing main valves are connected with an execution element through the oil paths, a three-way flow valve is arranged between the constant delivery pump and an oil tank, and a pilot pressure signal is sent to the load sensing main valves through a handle of a crane;
the electromagnetic valve and the cartridge valve are arranged between the fixed displacement pump and the oil tank, a first reversing port of the electromagnetic valve is communicated with the fixed displacement pump, a second reversing port of the electromagnetic valve is communicated with the oil tank, a third reversing port of the electromagnetic valve is communicated with a control oil port of the cartridge valve, a fourth reversing port of the electromagnetic valve is communicated with the oil tank, the electromagnetic valve is controlled by a handle opening enabling signal of a crane handle, a passage is formed between the first reversing port and the fourth reversing port in the electromagnetic valve in an initial state, a passage is formed between the second reversing port and the third reversing port, and a passage is formed between the first reversing port and the third reversing port in the electromagnetic valve and a passage is formed between the second reversing port and the fourth reversing port when the electromagnetic valve is triggered by power supply;
a first working oil port of the cartridge valve is communicated with the fixed displacement pump, and a second working oil port of the cartridge valve is communicated with an oil tank.
Preferably, the spring force of 3-3.5Mpa is preset in the three-way flow valve.
For a clearer understanding of the technical content of the present invention, the energy saving device of the crane load sensing system is simply referred to as the energy saving device below.
The energy-saving device has the beneficial technical effects that:
1. the constant delivery pump has low cost and high reliability, but the adaptability to the existing load sensitive main valve is not good enough, most of the load sensitive main valves are designed for variable delivery pumps, the non-working oil consumption condition when the crane does not work at idle speed is not considered, and the energy-saving problem of the constant delivery pump matched with the load sensitive valve can be solved by using the energy-saving device;
2. at present, handles used by the energy-saving device are all provided with an enabling switch (mainly playing a role in safety protection), and the energy-saving device is better in practicability without increasing the cost for a system for controlling the energy-saving device.
3. The energy-saving device is good in integration and mainly suitable for a quantitative pump system, and can be suitable for a variable pump system of a crane by slightly modifying, namely changing the initial state of the electromagnetic valve.
Drawings
FIG. 1 is a schematic diagram of a fluid circuit of a prior art crane load sensing system.
Fig. 2 is a schematic diagram of a fluid path of the energy saving device according to the embodiment.
FIG. 3 is a schematic diagram of the fluid path of the solenoid valve and cartridge valve of the embodiment of the economizer.
Detailed Description
As shown in fig. 2 to 3
A P port and an oil tank T port of a metering pump 1 of a crane load sensing system are respectively communicated with two groups of load sensing main valves through oil passages, the two groups of load sensing main valves are respectively a first load sensing main valve 2 and a second load sensing main valve 3, the first load sensing main valve 2 is further provided with a first compensation valve 21 in a matched mode, the second load sensing main valve 3 is further provided with a second compensation valve 31 in a matched mode, the first load sensing main valve 2 is connected with a crane winch through an oil passage, the second load sensing main valve 3 is connected with a telescopic oil cylinder through an oil passage, a three-way flow valve 4 is arranged between the P port of the metering pump 1 and the oil tank T port, 3-3.5Mpa spring force is preset in the three-way flow valve 4, and pilot pressure signals are sent to the first load sensing main valve 2 and the second load sensing main valve 3 through.
A solenoid valve 6 and a cartridge valve 7 are arranged between a port P of the fixed displacement pump 1 and a port T of an oil tank, a first reversing port A1 of the solenoid valve 6 is communicated with the port P of the fixed displacement pump 1, a second reversing port A2 of the solenoid valve 6 is communicated with the port T of the oil tank, a third reversing port B1 of the solenoid valve 6 is communicated with a control oil port K of the cartridge valve 7, a fourth reversing port B2 of the solenoid valve 6 is communicated with the port T of the oil tank, the solenoid valve 6 is controlled by an opening enabling signal of a handle 5 of the crane handle 5, a passage is formed between the first reversing port A1 and the fourth reversing port B2 in the solenoid valve 6 in an initial state, a passage is formed between the second reversing port A2 and the third reversing port B1, when the solenoid valve 6 is electrically triggered, a passage is formed between the first reversing port A1 and the third reversing port B1 in the solenoid valve 6, and a passage is formed between the second reversing port A2 and;
a first working oil port A of the cartridge valve 7 is communicated with a port P of the fixed displacement pump 1, and a second working oil port B of the cartridge valve 7 is communicated with a port T of an oil tank.
The working process is as follows:
(1) the whole machine starts the metering pump 1P port to start working, the operating handle 5 does not work, and hydraulic oil is output to the first load sensitive main valve 2 and the second load sensitive main valve 3.
(2) No electricity is applied to Y1 of the electromagnetic valve 6, oil flows back to the oil tank through the cartridge valve 72, and the hydraulic system has no backpressure (low backpressure) and generates little heat.
(3) When the oil-saving control valve needs to work, the handle 5 is started, the enabling switch is opened, the Y1 of the electromagnetic valve 6 is electrified, the cartridge valve 7 is closed, and the oil-obtaining execution elements of all the linked reversing valves start to work normally.
The energy-saving device utilizes an enabling switch of a current crane handle 5 to control the electromagnetic valve 6 through signals, and when the enabling switch has no signal, the flow output by a P port of the constant delivery pump 1 directly returns to a T port and finally returns to the oil tank through the cartridge valve 7.
When the execution element is required to work, the enabling switch is required to be firstly opened to operate according to the operation requirement of the crane, the electromagnetic valve 6 is electrified while the enabling switch is opened, the cartridge valve 7 is cut off, and the flow output by the pump cannot flow back to the oil tank through the cartridge valve 7. The oil obtained by the reversing valve starts to work normally.
The above description is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present invention, and these should also be considered as falling within the protection scope of the present invention.

Claims (2)

1. A constant delivery pump of a crane load sensing system is respectively communicated with a plurality of load sensing main valves through oil paths, the load sensing main valves are connected with an execution element through the oil paths, a three-way flow valve is arranged between the constant delivery pump and an oil tank, and a pilot pressure signal is sent to the load sensing main valves through a handle of the crane;
it is characterized in that:
the electromagnetic valve and the cartridge valve are arranged between the fixed displacement pump and the oil tank, a first reversing port of the electromagnetic valve is communicated with the fixed displacement pump, a second reversing port of the electromagnetic valve is communicated with the oil tank, a third reversing port of the electromagnetic valve is communicated with a control oil port of the cartridge valve, a fourth reversing port of the electromagnetic valve is communicated with the oil tank, the electromagnetic valve is controlled by a handle opening enabling signal of a crane handle, a passage is formed between the first reversing port and the fourth reversing port in the electromagnetic valve in an initial state, a passage is formed between the second reversing port and the third reversing port, and a passage is formed between the first reversing port and the third reversing port in the electromagnetic valve and a passage is formed between the second reversing port and the fourth reversing port when the electromagnetic valve is triggered by power supply;
a first working oil port of the cartridge valve is communicated with the fixed displacement pump, and a second working oil port of the cartridge valve is communicated with an oil tank.
2. The energy saver of a crane load sensing system as defined in claim 1 wherein:
the three-way flow valve is internally preset with 3-3.5Mpa spring force.
CN201911208908.0A 2019-11-30 2019-11-30 Energy-saving device of crane load sensing system Pending CN110778575A (en)

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Application Number Priority Date Filing Date Title
CN201911208908.0A CN110778575A (en) 2019-11-30 2019-11-30 Energy-saving device of crane load sensing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911208908.0A CN110778575A (en) 2019-11-30 2019-11-30 Energy-saving device of crane load sensing system

Publications (1)

Publication Number Publication Date
CN110778575A true CN110778575A (en) 2020-02-11

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104032792A (en) * 2014-05-28 2014-09-10 广西柳工机械股份有限公司 Quantitative and variable hydraulic system of loading machine
CN105090154A (en) * 2015-08-26 2015-11-25 徐工集团工程机械股份有限公司科技分公司 Unloading valve block, opening and closing core hydraulic system and engineering machine
CN204985186U (en) * 2015-08-26 2016-01-20 徐工集团工程机械股份有限公司科技分公司 Automatically controlled switching core hydraulic system and engineering machinery
CN211009394U (en) * 2019-11-30 2020-07-14 安徽柳工起重机有限公司 Energy-saving device of crane load sensing system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104032792A (en) * 2014-05-28 2014-09-10 广西柳工机械股份有限公司 Quantitative and variable hydraulic system of loading machine
CN105090154A (en) * 2015-08-26 2015-11-25 徐工集团工程机械股份有限公司科技分公司 Unloading valve block, opening and closing core hydraulic system and engineering machine
CN204985186U (en) * 2015-08-26 2016-01-20 徐工集团工程机械股份有限公司科技分公司 Automatically controlled switching core hydraulic system and engineering machinery
CN211009394U (en) * 2019-11-30 2020-07-14 安徽柳工起重机有限公司 Energy-saving device of crane load sensing system

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