CN109185241B - Loading and unloading switching valve for lorry-mounted crane - Google Patents
Loading and unloading switching valve for lorry-mounted crane Download PDFInfo
- Publication number
- CN109185241B CN109185241B CN201811395949.0A CN201811395949A CN109185241B CN 109185241 B CN109185241 B CN 109185241B CN 201811395949 A CN201811395949 A CN 201811395949A CN 109185241 B CN109185241 B CN 109185241B
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- Prior art keywords
- valve
- pressure
- switching valve
- port
- electromagnetic switching
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Classifications
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/06—Servomotor systems without provision for follow-up action; Circuits therefor involving features specific to the use of a compressible medium, e.g. air, steam
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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
- 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
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/0401—Valve members; Fluid interconnections therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to a loading and unloading switching valve for a lorry-mounted crane. The device comprises a first overflow valve, an electromagnetic switching valve, a second overflow valve, an electric proportional flow valve, a pressure compensator and an orifice; the first overflow valve is arranged between the quantitative pump pressure port pipeline and the oil tank pipeline; the quantitative pump pressure port pipeline is connected with an electromagnetic switching valve through a P port, and the oil tank pipeline is connected with the electromagnetic valve through a T port; the electromagnetic switching valve is connected with the get-on multi-way valve through a port B, and the electromagnetic valve is connected with the get-off landing leg control system through a port A. The invention has the advantages that: 1. the operation is simple, an independent switching valve is not needed, the on-off switching is controlled by the electric control, and the misoperation is avoided. 2. Each oil way system is provided with an independent overflow protection valve, pressure setting is carried out according to respective required pressure, and high-pressure impact generated by the supporting leg system is effectively avoided. 3. The landing leg control system adopts a load sensitive proportion control mode, flow is distributed according to the requirement, the operation micro-mobility is good, and the system throttling is efficient.
Description
Technical Field
The invention relates to a loading and unloading switching valve for a lorry-mounted crane, and belongs to the technical field of hydraulic control.
Background
The hydraulic control system of the lorry-mounted crane is mainly divided into two parts: a hydraulic control part of an upper car executing mechanism and a hydraulic control part of a lower car supporting leg; the two parts are completely independent in the whole lifting operation process, namely, the whole trolley is supported by the supporting leg operation part in the whole working process, and then the operation of the trolley-on executing mechanism can be carried out; in the whole working process, the operation of the landing leg of the getting-off is not allowed in the process of operating the getting-on executing mechanism.
At present, in the design of a truck mounted crane hydraulic system, the following control modes are mainly adopted in the control of the on-off operation:
the upper hydraulic control part and the lower hydraulic control part adopt two independent hydraulic control loops, and the upper hydraulic control system and the lower hydraulic control part are respectively controlled by adopting an independent hydraulic oil source and are not interfered with each other.
The upper hydraulic control system and the lower hydraulic control system share a hydraulic oil source, the middle is switched by a manual (or electric control) switching valve, and the lower hydraulic control system is independently provided with a landing leg selection control valve.
The upper hydraulic control system and the lower hydraulic control system share a hydraulic oil source, the lower hydraulic control system is independently provided with a landing leg selection control valve, and when the landing leg does not work, a hydraulic oil way enters the upper hydraulic control system through an intermediate oil way of the landing leg selection control valve.
The upper hydraulic control system and the lower hydraulic control system share a hydraulic oil source, the middle is switched by a manual (or electric control) switching valve, and the lower hydraulic control system is independently provided with a proportional control valve.
The disadvantage of the 1 st control mode is: the control of the hydraulic systems for getting on and off the vehicle are mutually independent, have no hydraulic interlocking function, and are easy to cause misoperation to cause accidents;
the disadvantage of the 2 nd control mode is: the control of the hydraulic systems for getting on and off the vehicle is mutually independent, a supporting leg selection control valve is required to be independently arranged, the supporting leg control is controlled by adopting a switching valve, the proportional control performance is poor, and the cost is high;
the 3 rd control mode has the following disadvantages: the control of the get-on and get-off hydraulic systems are mutually independent, a landing leg selection control valve is required to be independently arranged, a control oil way enters a get-on through a get-off valve, and the pressure grades are different when the get-on and get-off works, so that high-pressure impact is easy to be caused when the landing legs are operated;
the disadvantage of the 4 th control mode is: the control of the hydraulic systems for getting on and off the vehicle is mutually independent, the landing leg control valve is required to be independently arranged, the landing leg selection function is not provided, the landing leg linkage operation is inconvenient, and the cost is high.
Disclosure of Invention
The invention aims at overcoming the defects, and aims to provide a novel control mode, which can well realize the interlocking of a get-on/off hydraulic system through a get-on/off switching control valve, and has the functions of controlling and selecting the support legs, controlling the proportion of the telescopic support legs, and controlling the telescopic support legs in a sensitive manner.
The technical scheme adopted by the invention is as follows: the on-off switching valve for the lorry-mounted crane comprises a first overflow valve, an electromagnetic switching valve, a second overflow valve, an electric proportional flow valve, a pressure compensator and an orifice;
the first overflow valve is arranged between the quantitative pump pressure port pipeline and the oil tank pipeline;
the quantitative pump pressure port pipeline is connected with an electromagnetic switching valve through a P port, and the oil tank pipeline is connected with the electromagnetic valve through a T port;
the electromagnetic switching valve is connected with the get-on multi-way valve through a port B, and the electromagnetic valve is connected with the get-off landing leg control system through a port A.
The lower leg control system includes a second relief valve for low pressure limiting the leg system pressure;
the landing leg control system for the getting-off further comprises an electric proportional flow valve, a pressure compensator and an orifice, wherein the orifice is used for unloading the pressure of a spring cavity of the pressure compensator, and the orifice is communicated with an oil tank;
the electromagnetic switching valve is connected to the electric proportional flow valve and the pressure compensator in two ways through an A port, and the electric proportional flow signal is connected to the off-vehicle electromagnetic reversing valve.
The invention has the advantages that: 1. the operation is simple, an independent switching valve is not needed, the on-off switching is controlled by the electric control, and the misoperation is avoided.
2. Each oil way system is provided with an independent overflow protection valve, pressure setting is carried out according to respective required pressure, and high-pressure impact generated by the supporting leg system is effectively avoided. 3. The landing leg control system adopts a load sensitive proportion control mode, flow is distributed according to the requirement, the operation micro-mobility is good, and the system throttling is efficient. 4. Simple structure, low cost and easy manufacture.
Drawings
Fig. 1 is a hydraulic schematic of the present invention.
In the figure, 1 is a first relief valve, 2 is an electromagnetic switching valve, 3 is a second relief valve, 4 is an electric proportional flow valve, 5 is a pressure compensator, and 6 is an orifice.
Detailed Description
The on-off switching valve for the lorry-mounted crane comprises a first overflow valve, an electromagnetic switching valve, a second overflow valve, an electric proportional flow valve, a pressure compensator and an orifice;
the first overflow valve is arranged between the quantitative pump pressure port pipeline and the oil tank pipeline;
the quantitative pump pressure port pipeline is connected with an electromagnetic switching valve through a P port, and the oil tank pipeline is connected with the electromagnetic valve through a T port;
the electromagnetic switching valve is connected with the get-on multi-way valve through a port B, and the electromagnetic valve is connected with the get-off landing leg control system through a port A.
The lower leg control system includes a second relief valve for low pressure limiting the leg system pressure;
the landing leg control system for the getting-off further comprises an electric proportional flow valve, a pressure compensator and an orifice, wherein the orifice is used for unloading the pressure of a spring cavity of the pressure compensator, and the orifice is communicated with an oil tank;
the electromagnetic switching valve is connected to the electric proportional flow valve and the pressure compensator in two ways through an A port, and the electric proportional flow signal is connected to the off-vehicle electromagnetic reversing valve.
The invention will be further described below to give a better understanding of the invention: the invention is composed of six parts, namely a first overflow valve, an electromagnetic switching valve, a second overflow valve, an electric proportional flow valve, a pressure compensator and an orifice.
Functional 1 principle description: when the hydraulic system is just started, the electromagnetic switching valve 2 is in the middle-position H-shaped function, the flow of the quantitative pump directly returns to the oil tank through the H-shaped middle-position function, the energy loss of the system is reduced, and the energy consumption of the hydraulic system is minimized; and a first overflow valve is added between the pressure port pipeline of the constant delivery pump and the oil tank pipeline, so that the highest working pressure of the whole system is safely protected, and an overflow protection effect is achieved.
Functional 2 principle description: when the end of the electromagnetic switching valve 2 Y1 is powered on, the electromagnetic switching valve 2 works at the left position, and quantitative pump pressure oil directly enters a get-on hydraulic system after passing through an oil port of the electromagnetic switching valve B to control a get-on executing mechanism to act; the oil port of the electromagnetic switching valve A is directly communicated with the oil tank, and the pressure of the hydraulic system for getting off is directly unloaded.
The function 3 principle shows that when the end of the electromagnetic valve 2 Y2 is powered on, the electromagnetic switching valve 2 works at the right position, and quantitative pump pressure oil enters the landing leg control system after passing through an oil port of the electromagnetic switching valve A; a second overflow valve is arranged in the supporting leg pipeline to limit the pressure of the supporting leg system at low pressure; in the landing leg control system, a pressure compensator and a proportional flow valve are arranged, the purpose of sensitive proportional control on the telescopic load of the landing leg is achieved through the pressure compensator and the proportional flow valve, when the electric proportional flow valve has no control signal, the pressure of a spring cavity of the pressure compensator returns to an oil tank through an orifice, and pressure oil is unloaded at low pressure through the pressure compensator; when the electric proportional flow valve gives a proportional signal, the hydraulic system outputs proportional flow according to the proportional signal under the combined action of the electric proportional flow valve and the pressure compensator, and the flow is not related to the load and only related to the proportional signal. The valve block is provided with a fixed orifice for unloading the pressure of the spring cavity of the pressure compensator when the supporting leg system does not work, so as to achieve the purpose of unloading the low pressure of the supporting leg system.
Claims (1)
1. The on-off switching valve for the lorry-mounted crane is characterized by comprising a first overflow valve, an electromagnetic switching valve, a second overflow valve, an electric proportional flow valve, a pressure compensator and an orifice; the first overflow valve is arranged between the quantitative pump pressure port pipeline and the oil tank pipeline; the quantitative pump pressure port pipeline is connected with the electromagnetic switching valve through a P port, and the oil tank pipeline is connected with the electromagnetic switching valve through a T port; the electromagnetic switching valve is connected with the get-on multi-way valve through a port B, and is connected with the get-off landing leg control system through a port A;
the lower landing leg control system comprises a second overflow valve for limiting the pressure of the landing leg system at a low pressure; the landing leg control system for the getting-off comprises an electric proportional flow valve, a pressure compensator and an orifice, wherein the orifice is used for unloading the pressure of a spring cavity of the pressure compensator, and the orifice is communicated with an oil tank; the electromagnetic switching valve is connected to the electric proportional flow valve and the pressure compensator in two ways through an A port, and the electric proportional flow valve is connected to the off-vehicle electromagnetic reversing valve;
the method is carried out according to the following working modes: when the hydraulic system is just started, the electromagnetic switching valve is in the middle-position H-shaped function, the flow of the quantitative pump directly returns to the oil tank through the H-shaped middle-position function, the energy loss of the system is reduced, and the energy consumption of the hydraulic system is minimized; a first overflow valve is added between a quantitative pump pressure port pipeline and an oil tank pipeline, so that the highest working pressure of the whole system is safely protected, and an overflow protection effect is achieved;
when the end of the electromagnetic switching valve Y1 is powered on, the electromagnetic switching valve works at the left position, and quantitative pump pressure oil directly enters the get-on hydraulic system after passing through the oil port of the electromagnetic switching valve B to control the action of the get-on executing mechanism; the oil port of the electromagnetic switching valve A is directly communicated with the oil tank, and the pressure of the hydraulic system for getting off is directly unloaded;
when the end of the electromagnetic switching valve Y2 is powered on, the electromagnetic switching valve works at the right position, and quantitative pump pressure oil enters the lower support leg control system after passing through an oil port of the electromagnetic switching valve A; a second overflow valve is arranged in the supporting leg pipeline to limit the pressure of the supporting leg system at low pressure; in the landing leg control system, a pressure compensator and a proportional flow valve are arranged, the purpose of sensitive proportional control on the telescopic load of the landing leg is achieved through the pressure compensator and the proportional flow valve, when the electric proportional flow valve has no control signal, the pressure of a spring cavity of the pressure compensator returns to an oil tank through an orifice, and pressure oil is unloaded at low pressure through the pressure compensator; when the electric proportional flow valve gives out a proportional signal, the hydraulic system outputs proportional flow according to the proportional signal under the combined action of the electric proportional flow valve and the pressure compensator, and the flow is not related to the load and only related to the proportional signal; the valve block is provided with a fixed orifice for unloading the pressure of the spring cavity of the pressure compensator when the supporting leg system does not work, so as to achieve the purpose of unloading the low pressure of the supporting leg system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811395949.0A CN109185241B (en) | 2018-11-22 | 2018-11-22 | Loading and unloading switching valve for lorry-mounted crane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811395949.0A CN109185241B (en) | 2018-11-22 | 2018-11-22 | Loading and unloading switching valve for lorry-mounted crane |
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| Publication Number | Publication Date |
|---|---|
| CN109185241A CN109185241A (en) | 2019-01-11 |
| CN109185241B true CN109185241B (en) | 2023-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811395949.0A Active CN109185241B (en) | 2018-11-22 | 2018-11-22 | Loading and unloading switching valve for lorry-mounted crane |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111101553B (en) * | 2020-01-14 | 2022-02-15 | 徐州徐工矿业机械有限公司 | Electric control rotary brake release system of hydraulic excavator and use method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202923545U (en) * | 2012-11-05 | 2013-05-08 | 徐州重型机械有限公司 | Loading and unloading switching device and load-sensitive hydraulic system |
| CN203770261U (en) * | 2014-03-03 | 2014-08-13 | 徐州重型机械有限公司 | Fire truck and getting-on and getting-off switching system thereof |
| CN104712603A (en) * | 2015-03-18 | 2015-06-17 | 徐州重型机械有限公司 | Hydraulic system of autocrane, autocrane and control method |
-
2018
- 2018-11-22 CN CN201811395949.0A patent/CN109185241B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202923545U (en) * | 2012-11-05 | 2013-05-08 | 徐州重型机械有限公司 | Loading and unloading switching device and load-sensitive hydraulic system |
| CN203770261U (en) * | 2014-03-03 | 2014-08-13 | 徐州重型机械有限公司 | Fire truck and getting-on and getting-off switching system thereof |
| CN104712603A (en) * | 2015-03-18 | 2015-06-17 | 徐州重型机械有限公司 | Hydraulic system of autocrane, autocrane and control method |
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| CN109185241A (en) | 2019-01-11 |
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