CN203889960U - Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane - Google Patents

Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane Download PDF

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Publication number
CN203889960U
CN203889960U CN201420317043.8U CN201420317043U CN203889960U CN 203889960 U CN203889960 U CN 203889960U CN 201420317043 U CN201420317043 U CN 201420317043U CN 203889960 U CN203889960 U CN 203889960U
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CN
China
Prior art keywords
mouth
hydraulic
actuator port
oil
valve
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.)
Expired - Fee Related
Application number
CN201420317043.8U
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Chinese (zh)
Inventor
杜玲玲
刘树
于万钊
刘杰
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China Machinery Heavy Industry Group Chang Linzhu Co Ltd
Original Assignee
CHANGLIN Co Ltd
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.)
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Priority to CN201420317043.8U priority Critical patent/CN203889960U/en
Application granted granted Critical
Publication of CN203889960U publication Critical patent/CN203889960U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a hydraulic system of a telescopic boom of a straight-arm-type lorry-mounted crane. The hydraulic system is provided with a hydraulic pump, a reversing valve, a balance valve, cantilever crane telescopic cylinders, a hydraulic oil tank and an electromagnetic reversing valve, one end of the hydraulic pump is connected with the hydraulic oil tank, one end of the hydraulic oil tank is connected with an oil inlet P of the reversing valve, an operating oil hole A of the reversing valve is connected with an operating oil hole V2 of the balance valve, an operating oil hole B of the reversing valve is connected with an oil inlet P of the electromagnetic reversing valve, an operating oil hole B of the electromagnetic reversing valve is connected with an operating oil hole V1 of the balance valve, an operating oil hole C2 of the balance valve is connected with rodless cavities of the two cantilever crane telescopic cylinders, an operating oil hole C1 of the balance valve is connected with rod cavities of the two cantilever crane telescopic cylinders, an oil returning hole T of the electromagnetic reversing valve is connected with the operating oil hole V2 of the balance valve, and a water returning hole T of the reversing valve leads into the hydraulic oil tank. The hydraulic system extends at high speed under a light load working condition or a load-free working condition and extends at low speed during load operation, is capable of increasing the working efficiency of a cantilever crane, and is simple in structure.

Description

Straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system
Technical field
The utility model relates to straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system.
Background technology
at present, the straight arm type lorry-mounted crane telescopic boom on market is driven and is stretched out retraction by hydraulic ram now, the oil-feed of hydraulic ram rodless cavity, and rod chamber is fuel-displaced, and oil cylinder stretches out, and the telescopic boom of hoisting crane stretches out; The oil-feed of hydraulic ram rod chamber, rodless cavity is fuel-displaced, and oil cylinder is retracted, and the telescopic boom of hoisting crane is retracted.Hydraulic ram stretches out, retracts and only have a kind of speed, so telescopic crane boom stretches out, retracts and also only have a kind of speed, and the time of stretching out is slower, and efficiency is lower.
Utility model content
The purpose of this utility model is to propose a kind ofly can realize the straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system that telescopic boom stretches out double speed.
For achieving the above object, the utility model is taked following technical scheme: a kind of straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system, there is Hydraulic Pump, change-over valve, balance cock, two jib telescopic oil cylinders, hydraulic reservoir, also there is solenoid directional control valve, one end of Hydraulic Pump is connected with hydraulic reservoir, one end is connected with the oil inlet P mouth of change-over valve, the actuator port A mouth of change-over valve and the actuator port V2 mouth of balance cock are connected, the actuator port B mouth of change-over valve and the oil inlet P mouth of solenoid directional control valve are connected, the actuator port B mouth of solenoid directional control valve and the actuator port V1 mouth of balance cock are connected, the actuator port C2 mouth of balance cock is connected with the rodless cavity of two jib telescopic oil cylinders, the actuator port C1 mouth of balance cock is connected with the rod chamber of two jib telescopic oil cylinders, the actuator port V2 mouth of the oil return inlet T mouth of solenoid directional control valve and balance cock is connected, the oil return inlet T mouth of change-over valve leads to hydraulic reservoir.
Between the oil return inlet T mouth of described change-over valve and hydraulic reservoir, be connected in series return filter.
Between the oil inlet P mouth of described hydraulic reservoir and change-over valve, be also provided with and Hydraulic Pump the by pass valve that connects.
The utlity model has following good effect: the telescopic boom in this straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system is in underloading or be not with realization under year operating mode to stretch out at a high speed, when load operation, realize and stretch out at a slow speed accurately to control telescopic boom extended position, native system can improve straight arm type lorry-mounted crane jib work efficiency, simple in structure.
Accompanying drawing explanation
Fig. 1 is hydraulic schematic diagram of the present invention.
The specific embodiment
Embodiment 1
A kind of straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system, there is Hydraulic Pump 1, change-over valve 2, balance cock 3, two jib telescopic oil cylinders 4, hydraulic reservoir 7, solenoid directional control valve 8, one end of Hydraulic Pump 1 is connected with hydraulic reservoir 7, one end is connected with the oil inlet P mouth of change-over valve 2, the actuator port A mouth of change-over valve 2 and the actuator port V2 mouth of balance cock 3 are connected, the actuator port B mouth of change-over valve 2 and the oil inlet P mouth of solenoid directional control valve 8 are connected, the actuator port B mouth of solenoid directional control valve 8 and the actuator port V1 mouth of balance cock 3 are connected, the actuator port C2 mouth of balance cock 3 is connected with the rodless cavity of two jib telescopic oil cylinders 4, the actuator port C1 mouth of balance cock 3 is connected with the rod chamber of two jib telescopic oil cylinders 4, the actuator port V2 mouth of the oil return inlet T mouth of solenoid directional control valve 8 and balance cock 3 is connected, the oil return inlet T mouth that is solenoid directional control valve 8 is connected on the connecting line between the actuator port A mouth of change-over valve 2 and the actuator port V2 mouth of balance cock 3.
The oil return inlet T mouth of change-over valve 2 leads to hydraulic reservoir 7, between the oil return inlet T mouth of described change-over valve 2 and hydraulic reservoir 7, is connected in series return filter 5, in the oil return inlet T mouth of change-over valve 2 leads to the pipeline of hydraulic reservoir 7, is connected in series return filter 5.
Between described hydraulic reservoir 7 and the oil inlet P mouth of change-over valve 2, be also provided with and Hydraulic Pump 1 by pass valve 6 that connects.
native system can be realized and stretching out at a slow speed when telescopic boom load operation.Pull change-over valve 2, the right position of change-over valve 2, the pressure oil of the oil outlet of Hydraulic Pump 1 arrives the actuator port A mouth of change-over valve 2 through the oil inlet P mouth of change-over valve 2, then by the actuator port V2 mouth of balance cock 3, arrive the actuator port C2 mouth of balance cock 3, and then arrive the rodless cavity 4-1 of two jib telescopic oil cylinders 4 of hoisting crane.The hydraulic oil of the rod chamber 4-2 of crane telescopic oil cylinder 4 arrives the actuator port V1 mouth of balance cock 3 through balance cock 3 actuator port C1 mouths, now solenoid directional control valve 8 must not be electric, therefore hydraulic oil reaches pressure hydraulic fluid port P mouth by the actuator port B mouth of solenoid directional control valve 8, by the actuator port B mouth of change-over valve 2, reach the oil return inlet T mouth of change-over valve 2, then through the actuator port P1 mouth of return filter 5, reach the actuator port P2 mouth of return filter 5, flow back to hydraulic reservoir 7, in this process, crane arm support telescopic oil cylinder 4 slowly stretches out, driving telescopic boom to realize stretches out at a slow speed.
Native system can in telescopic boom underloading or be with to carry under operating mode and be realized at a high speed and stretching out.Pull change-over valve 2, the right position of change-over valve 2, the pressure oil of the oil outlet of Hydraulic Pump 1 arrives the actuator port A mouth of change-over valve 2 through the oil inlet P mouth of change-over valve 2, then the actuator port V2 mouth by balance cock 3 arrives actuator port C2 mouth, and then arrives the rodless cavity of crane arm support telescopic oil cylinder 4, the hydraulic oil of crane arm support telescopic oil cylinder 4 rod chambers arrives actuator port V1 mouth through balance cock 3 actuator port C1 mouths, now solenoid directional control valve 8 obtains electric, therefore hydraulic oil arrives oil return inlet T mouth by the actuator port B mouth of solenoid directional control valve 8, behind the hydraulic oil interflow of the hydraulic oil of solenoid directional control valve T mouth and change-over valve 2 actuator port A mouths, flow to the actuator port V2 mouth of balance cock 3, hydraulic oil arrives the actuator port C2 mouth of balance cock 3 by the actuator port V2 mouth of balance cock 3, and then the rodless cavity of arrival crane arm support telescopic oil cylinder 4, crane arm support telescopic oil cylinder 4 stretches out fast, driving telescopic boom to realize at a high speed stretches out.
When needs telescopic boom is retracted, promote change-over valve 2, the left position of change-over valve 2, the pressure oil of the oil outlet of Hydraulic Pump 1 arrives actuator port B mouth through the oil inlet P mouth of change-over valve 2, the hydraulic oil of the actuator port B mouth of change-over valve 2 flows to the oil inlet P mouth of solenoid directional control valve 8, now solenoid directional control valve 8 must not be electric, therefore hydraulic oil arrives the actuator port B mouth of solenoid directional control valve 8 by the pressure hydraulic fluid port P mouth of solenoid directional control valve 8, the hydraulic oil of the actuator port B mouth of solenoid directional control valve 8 arrives the actuator port C1 mouth of balance cock 3 by the V1 mouth of balance cock 3, flow to the rod chamber of crane arm support telescopic oil cylinder 4, the hydraulic oil of the rodless cavity of crane arm support telescopic oil cylinder 4 reaches actuator port V2 mouth through balance cock 3 actuator port C2 mouths, then the actuator port A mouth by change-over valve 2 arrives oil return inlet T mouth, then the actuator port P1 mouth through return filter 5 reaches actuator port P2 mouth, flow back to hydraulic reservoir 7, crane arm support telescopic oil cylinder 4 is retracted, drive telescopic boom is retracted.

Claims (3)

1. a straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system, there is Hydraulic Pump (1), change-over valve (2), balance cock (3), two jib telescopic oil cylinders (4), hydraulic reservoir (7), it is characterized in that: also there is solenoid directional control valve (8), one end of Hydraulic Pump (1) is connected with hydraulic reservoir (7), one end is connected with the oil inlet P mouth of change-over valve (2), the actuator port A mouth of change-over valve (2) is connected with the actuator port V2 mouth of balance cock (3), the actuator port B mouth of change-over valve (2) is connected with the oil inlet P mouth of solenoid directional control valve (8), the actuator port B mouth of solenoid directional control valve (8) is connected with the actuator port V1 mouth of balance cock (3), the actuator port C2 mouth of balance cock (3) is connected with the rodless cavity of two jib telescopic oil cylinders (4), the actuator port C1 mouth of balance cock (3) is connected with the rod chamber of two jib telescopic oil cylinders (4), the actuator port V2 mouth of the oil return inlet T mouth of solenoid directional control valve (8) and balance cock (3) is connected, the oil return inlet T mouth of change-over valve (2) leads to hydraulic reservoir (7).
2. straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system according to claim 1, is characterized in that: between the oil return inlet T mouth of change-over valve (2) and hydraulic reservoir (7), be connected in series return filter (5).
3. straight arm type lorry-mounted crane telescopic boom hydraulic efficiency pressure system according to claim 1, is characterized in that: between hydraulic reservoir (7) and the oil inlet P mouth of change-over valve (2), be also provided with and Hydraulic Pump (1) the by pass valve (6) that connects.
CN201420317043.8U 2014-06-13 2014-06-13 Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane Expired - Fee Related CN203889960U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420317043.8U CN203889960U (en) 2014-06-13 2014-06-13 Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420317043.8U CN203889960U (en) 2014-06-13 2014-06-13 Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane

Publications (1)

Publication Number Publication Date
CN203889960U true CN203889960U (en) 2014-10-22

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Application Number Title Priority Date Filing Date
CN201420317043.8U Expired - Fee Related CN203889960U (en) 2014-06-13 2014-06-13 Hydraulic system of telescopic boom of straight-arm-type lorry-mounted crane

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481954A (en) * 2014-12-17 2015-04-01 湖南星邦重工有限公司 Mechanical cantilever crane and balance valve group thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481954A (en) * 2014-12-17 2015-04-01 湖南星邦重工有限公司 Mechanical cantilever crane and balance valve group thereof

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C41 Transfer of patent application or patent right or utility model
TR01 Transfer of patent right

Effective date of registration: 20160803

Address after: 213022 No. 36 middle Huashan Road, Xinbei District, Jiangsu, Changzhou

Patentee after: China machinery heavy industry group Chang Linzhu Co., Ltd.

Address before: 213002 No. 10 Chang Linzhu Road, bell tower area, Jiangsu, Changzhou

Patentee before: Changlin Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141022

Termination date: 20210613

CF01 Termination of patent right due to non-payment of annual fee