CN203461743U

CN203461743U - Rotary hydraulic system of crane

Info

Publication number: CN203461743U
Application number: CN201320466970.1U
Authority: CN
Inventors: 肖广顺; 李文亮; 张庆江
Original assignee: LIAONING RUIFENG SPECIAL VEHICLE MANUFACTURING Co Ltd
Current assignee: LIAONING RUIFENG SPECIAL VEHICLE MANUFACTURING Co Ltd
Priority date: 2013-08-01
Filing date: 2013-08-01
Publication date: 2014-03-05
Anticipated expiration: 2023-08-01

Abstract

The utility model relates to the field of rotary hydraulic systems of cranes and particularly relates to a rotary hydraulic system of a crane. The rotary hydraulic system comprises a brake, a motor, a check valve I, a check valve II, an overflowing valve I, an overflowing valve II, an oil feeding check calve I, an oil feeding check calve II, a shuttle valve and a solenoid valve. The rotary hydraulic system is characterized in that the two ends of the oil feeding check calve I are connected with the overflowing valve I in parallel; the two ends of the oil feeding check calve II are connected with the overflowing valve II in parallel; a circuit of the overflowing valve I is connected with a throttling valve III in series; a circuit of the overflowing valve II is connected with a throttling valve IV in series; a decompression valve is connected with a circuit between the shuttle valve and the solenoid valve in series; a throttling valve V and an energy accumulator are connected with a circuit between the solenoid valve and the brake in series; the two ends of the throttling valve V are connected with a check valve III in series. Compared with the prior art, the rotary hydraulic system of the crane has the beneficial effects that throttling and buffering elements are additionally arranged so that the impacting and shaking problems of a system are solved completely; meanwhile, the movement pressure for controlling the brake is not more than 3MPa so that an oil leaking problem of the brake is solved.

Description

A kind of hydraulic system of crane

Technical field

The utility model relates to hydraulic system of crane field, relates in particular to a kind of hydraulic system of crane that solves revolution shake, impact and drg Leakage.

Background technology

Crane rotation system substantially all adopts hydraulic power to drive at present, see accompanying drawing 1, its structure is generally comprised of drg (1), motor (2), check valve one (3) and check valve two (12), by pass valve one (4) and by pass valve two (13), in line check valve one (5) and in line check valve two (14), shuttle valve (8) and electromagnetic valve (16), the effect of shuttle valve (8) is the pressure of comparison oil inlet one V1 and oil inlet two V2, and automatically choose the side that pressure is larger, when moving and stop, the very large turntable of quality can occur to impact and jitter phenomenon; And because original drg oil circuit pressure is very high, often meet or exceed drg nominal working pressure, easily destroy the sealing arrangement of drg the inside, therefore easily leakage of oil.

Summary of the invention

The purpose of this utility model is to provide a kind of hydraulic system of crane, optimize oil channel structures, on the oil circuit control loop of oil pump and drg, increase impact and the jitter problem of throttling and buffer element resolution system, control the Leakage that brakeage pressure solves drg simultaneously.

For achieving the above object, the utility model adopts following technical scheme to realize:

A kind of hydraulic system of crane, comprise drg, motor, check valve one and check valve two, by pass valve one and by pass valve two, in line check valve one and in line check valve two, shuttle valve and electromagnetic valve, at the two ends of in line check valve one and connect flow regulating valve one, at the two ends of in line check valve two and connect flow regulating valve two, at by pass valve one loop, place serial connection flow regulating valve three, at by pass valve two loop, place serial connection flow regulating valve four, on the loop between shuttle valve and electromagnetic valve, be connected in series reducing valve, on the loop between electromagnetic valve and drg, be connected in series flow regulating valve five and energy storage are set, the two ends of flow regulating valve five also connect check valve three.

Described reducing valve is 3MPa specification.

Compared with prior art, the beneficial effects of the utility model are: by optimizing oil channel structures, on the oil circuit control loop of oil pump and drg, increase throttling and buffer element, impact and the jitter problem of system have thoroughly been solved, control brakeage pressure simultaneously and be not more than 3MPa, thereby solved the Leakage of drg.

Accompanying drawing explanation

Fig. 1 is the hydraulic control circuit structural representation of prior art;

Fig. 2 is the utility model example structure schematic diagram.

In figure: 1-drg 2-motor 3-check valve one 4-by pass valve one 5-in line check valve one 6-flow regulating valve one 7-flow regulating valve three 8-shuttle valve 9-energy storage 10-flow regulating valve five 11-check valve three 12-check valve two 13-by pass valve two 14-in line check valve two 15-flow regulating valve two 16-electromagnetic valve 17-flow regulating valve four 18-reducing valves

The specific embodiment

Below in conjunction with accompanying drawing, the specific embodiment one step of the present utility model is illustrated:

See Fig. 2, it is a kind of hydraulic system of crane example structure of the utility model schematic diagram, comprise drg 1, motor 2, check valve 1 and check valve 2 12, by pass valve 1 and by pass valve 2 13, in line check valve 1 and in line check valve 2 14, shuttle valve 8 and electromagnetic valve 16, at the two ends of in line check valve 1 and connect flow regulating valve 1, at the two ends of in line check valve 2 14 and connect flow regulating valve 2 15, at by pass valve one 4 loop, place serial connection flow regulating valve 37, at by pass valve 2 13 loop, place serial connection flow regulating valve 4 17, on the loop between shuttle valve 8 and electromagnetic valve 16, be connected in series reducing valve 18, on the loop between electromagnetic valve 16 and drg 2, be connected in series flow regulating valve 5 10 and energy storage 9 are set, the two ends of flow regulating valve 5 10 also connect check valve 3 11, the A mouth of check valve 11 is in electromagnetic valve 16 1 sides, its P mouth is in drg 1 one sides.Reducing valve 18 is 3MPa specification.The whole rotary system of the utility model is comprised of three parts, be respectively rotary control valve, brake control valve and rotary motor, wherein rotary control valve is comprised of check valve 1, by pass valve 1, in line check valve 1, flow regulating valve 1, flow regulating valve 37, shuttle valve 8, check valve 2 12, by pass valve 2 13, in line check valve 2 14, flow regulating valve 2 15, flow regulating valve 4 17 and reducing valve 18.Brake control valve is comprised of energy storage 9, flow regulating valve 5 10, check valve 3 11 and electromagnetic valve 16.

From starting and stop two aspects explanation the utility model system of starting with, how to realize and eliminate shake and impact respectively below.

Start: take and turn round left as example, when hoisting crane need to turn round left, first by oil inlet V1 place, enter pressure oil, fluid has both direction, one is by flow regulating valve 1 and in line check valve 1, to flow into the C1 mouth of motor 2, and another is to flow to electromagnetic valve 16 by shuttle valve 8 and reducing valve 18.Now electromagnetic valve 16 electric, spool left position work, flows into drgs by fluid by check valve 3 11 and flow regulating valve 5 10, and drg 1 is opened.And in the process of opening because some fluid has stored by energy storage 9, so drg opening speed is moderate, and motor starts to rotate under the effect of C1 mouth pressure oil.C2 is the return opening of motor, and fluid starts slowly to flow out through flow regulating valve 2 15, and keeps the certain back pressure of C2 mouth, has eliminated the impact phenomenon starting under these two kinds of factors.And accelerate gradually when motor rotary speed, the back pressure of C2 mouth raises gradually, and when pressure that pressure is set higher than by pass valve 2 13, by pass valve 2 13 is opened completely, and through 4 17 oil returns of larger flow regulating valve, it is the fastest that speed of revolutions reaches.Otherwise, as the same to right-hand rotation.

Stop: still take to turn round left and stop as example, when crane rotation stops, oil inlet V1 and V2 be stop control lever, but motor 2 will be rotated further under the effect of turntable force of inertia.If now drg 1 is directly closed, will inevitably cause strong impact and shake.Therefore the present invention is provided with energy storage 9, check valve 3 11 and flow regulating valve 5 10, when electromagnetic valve 16 dead electricity, spool right position work, the oil circuit of drg 1 is communicated with by flow regulating valve 5 10 and fuel tank, under the combined action of flow regulating valve 5 10 and energy storage 9, drg can postpone and slowly closing, by regulating the adjustable drg of the openings of sizes shut of charging pressure of accumulator and flow regulating valve 5 10, thereby weakens impact and the shake that stops bringing.

Here, the effect of shuttle valve 8 is the pressure of comparison oil inlet V1 and V2, and automatically chooses the side that pressure is larger, by reducing valve 18 to brake control valve fuel feeding.And the effect of reducing valve 18 is to guarantee that drg oil circuit control pressure is not more than 3MPa, the oil cylinder operation pressure of drg will significantly reduce like this, and can guarantee to open completely drg, so guaranteed the safety of drg, prevents leakage of oil.The effect of flow regulating valve 1 and flow regulating valve 2 15 is the impacts while weakening revolution startup.The effect of check valve 1 and check valve 2 12 is C1 mouth, the C2 interruption-forming closed loops with motor 1, and when V1 and V2 mouth stop control lever, and motor when still rotate under the force of inertia effect of turntable, plays repairing effect, prevents that motor from inhaling empty.

Claims

1. a hydraulic system of crane, comprise drg, motor, check valve one and check valve two, by pass valve one and by pass valve two, in line check valve one and in line check valve two, shuttle valve and electromagnetic valve, it is characterized in that, at the two ends of in line check valve one and connect flow regulating valve one, at the two ends of in line check valve two and connect flow regulating valve two, at by pass valve one loop, place serial connection flow regulating valve three, at by pass valve two loop, place serial connection flow regulating valve four, on the loop between shuttle valve and electromagnetic valve, be connected in series reducing valve, on the loop between electromagnetic valve and drg, be connected in series flow regulating valve five and energy storage are set, the two ends of flow regulating valve five also connect check valve three.

2. a kind of hydraulic system of crane according to claim 1, is characterized in that, described reducing valve is 3MPa specification.