CN202542791U - Hydraulic system of two full-free door frames of 25-ton forklift - Google Patents

Hydraulic system of two full-free door frames of 25-ton forklift Download PDF

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Publication number
CN202542791U
CN202542791U CN2012201407609U CN201220140760U CN202542791U CN 202542791 U CN202542791 U CN 202542791U CN 2012201407609 U CN2012201407609 U CN 2012201407609U CN 201220140760 U CN201220140760 U CN 201220140760U CN 202542791 U CN202542791 U CN 202542791U
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China
Prior art keywords
valve
governor valve
oil tank
oil
lift
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CN2012201407609U
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Chinese (zh)
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吴猛
孙庆宁
杨雪松
方庆
张昊
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Anhui Heli Co Ltd
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Anhui Heli Co Ltd
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Abstract

The utility model relates to a hydraulic system of two full-free door frames of a 25-ton forklift. The hydraulic system comprises a multitandem valve, a left rear lifting oil cylinder, a right rear lifting oil cylinder, a left front lifting oil cylinder, a right front lifting oil cylinder, a hydraulic oil tank, a governor valve, a right rear governor valve, a left front governor valve and a right front governor valve, wherein the multitandem valve comprises a lifting valve plate and a safety valve; and the hydraulic system is improved in that an oil inlet of the left rear governor valve is communicated with an oil outlet of a right main governor valve after being connected with the oil inlet of the right front governor valve in parallel, and the oil inlet of a left main governor is communicated with the oil outlet A of the lifting valve plate after being connected with the oil inlet of the right main governor valve. Through the additional arrangement of the left main governor valve and the right main governor valve, front and rear lifting oil cylinders are descended in sequence when door frames are descended in full loads. According to the hydraulic system disclosed by the utility model, the descending of the door frames is stable and reliable, high-pressure oil throttling squeaking sounds are free, and the control accuracy of a driver is increased.

Description

The hydraulic efficiency pressure system of the complete free door frame of 25 ton forklifts, two joints
Technical field
The utility model belongs to fork truck hydraulic efficiency pressure system technical field, is specifically related to the hydraulic efficiency pressure system of the complete free door frame of 25 ton forklifts, two joints.
Background technology
The complete free door frame of heavy 25 ton forklifts, two joints can satisfy the strict working place of crossing ability; Promptly can not change at the stroke inner upright mounting height that freely hoists; The complete free lifting mechanism of its door frame is that goods shelf need satisfy the principle that hoists earlier and afterwards descend; Could satisfy operation rule and safe in operation standard like this, two joints complete free door frame Design of Hydraulic System also is based on last to be confirmed, the variation of front and back lift oil tank cylinder diameter causes that priority hoists under same operation pressure situation; The oil inlet of four lift oil tanks in front and back is equipped with the Limit Rate valve; Controllability, the stationarity of speed when guaranteeing that fully loaded door frame descends, there is following shortcoming in this kind piping layout mode: oil cylinder descended simultaneously before and after 1, door frame was fully loaded when descending, and influence the accuracy that navigating mate is operated; 2, the sound of obviously uttering long and high-pitched sounds is arranged during the oil cylinder oil return during fully loaded decline, the governor valve restriction effect is bad, and initial sloping portion speed is uneven.
Summary of the invention
For the problem that oil cylinder before and after solving descends simultaneously and descending speed is uneven, the utility model provides the hydraulic efficiency pressure system of the complete free door frame of a kind of 25 ton forklifts, two joints through structural development.
The improved technical scheme of the utility model is following:
The hydraulic efficiency pressure system of the complete free door frame of 25 ton forklifts, two joints comprises multiway valve 1, left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4, right front lift oil tank 5 and hydraulic reservoir 13; Said multiway valve 1 comprises hoist valve block 14 and safety valve 15; The said valve block 14 that hoists is three six-way valves; The oil outlet A of valve block 14 of hoisting is being communicated with the oil inlet of multiway valve safety valve 15, multiway valve safety valve 15 oil outlet direct connection hydraulic reservoirs 13, and the valve block 14 that hoists is provided with oil inlet P; The rod chamber of said left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4 and right front lift oil tank 5 is communicated to hydraulic reservoir 13 through pipeline respectively; The rodless cavity of said left back lift oil tank 2 is being communicated with the oil outlet of left back governor valve 9 through pipeline, and the rodless cavity of said right back lift oil tank 3 is being communicated with the oil outlet of right back governor valve 10 through pipeline; The rodless cavity of said left front lift oil tank 4 is being communicated with the oil outlet of left front governor valve 7 through pipeline, and the rodless cavity of said right front lift oil tank 5 is being communicated with the oil outlet of right front governor valve 8 through pipeline; Improvement is: the oil inlet of the oil inlet of said left back governor valve 9 and left front governor valve 7 is parallelly connected, and is being communicated with the oil outlet of left main governor valve 11; The oil inlet of the oil inlet of said right back governor valve 10 and right front governor valve 8 is parallelly connected, and is being communicated with the oil outlet of right main governor valve 12; The oil outlet A that is being communicated with the valve block 14 that hoists after the oil inlet of the main governor valve 11 in a left side and the oil inlet parallel connection of right main governor valve 12.
Said left front governor valve 7, right front governor valve 8, left back governor valve 9, right back governor valve 10, left main governor valve 11 and right main governor valve 12 are the throttle type governor valve.
The utility model is compared with prior art products and is had the advantage of following aspect:
1, door frame is fully loaded with when descending, and the front and back lift oil tank descends sequentially, and promptly the back lift oil tank descends earlier, descends behind the preceding lift oil tank;
2, commonality is better, and the complete free door frame of all refitting fork truck two joints at present is suitable for making a concerted effort;
3, it is reliable that the utility model makes the door frame smooth decreasing, and the no high-voltage oil liquid throttling sound of uttering long and high-pitched sounds has improved navigating mate and handled accuracy.
Description of drawings
Fig. 1 is the utility model systematic schematic diagram.
Fig. 2 is the partial enlarged drawing of Fig. 1.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is done explanation further through embodiment.
Embodiment:
Referring to Fig. 1 and Fig. 2, the hydraulic efficiency pressure system of the complete free door frame of 25 ton forklifts, two joints comprises multiway valve 1, left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4, right front lift oil tank 5 and hydraulic reservoir 13.Multiway valve 1 comprises hoist valve block 14 and safety valve 15; The valve block 14 that hoists is three six-way valves; The oil outlet A of valve block 14 of hoisting is being communicated with the oil inlet of multiway valve safety valve 15, multiway valve safety valve 15 oil outlet direct connection hydraulic reservoirs 13, and the valve block 14 that hoists is provided with oil inlet P.The rod chamber of left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4 and right front lift oil tank 5 is communicated to hydraulic reservoir 13 through pipeline respectively.The rodless cavity of left back lift oil tank 2 is being communicated with the oil outlet of left back governor valve 9 through pipeline, and the rodless cavity of right back lift oil tank 3 is being communicated with the oil outlet of right back governor valve 10 through pipeline; The rodless cavity of left front lift oil tank 4 is being communicated with the oil outlet of left front governor valve 7 through pipeline, and the rodless cavity of right front lift oil tank 5 is being communicated with the oil outlet of right front governor valve 8 through pipeline.The oil inlet of the oil inlet of left back governor valve 9 and left front governor valve 7 is parallelly connected, and is being communicated with the oil outlet of left main governor valve 11; The oil inlet of the oil inlet of right back governor valve 10 and right front governor valve 8 is parallelly connected, and is being communicated with the oil outlet of right main governor valve 12; The oil outlet A that is being communicated with the valve block 14 that hoists after the oil inlet of the main governor valve 11 in a left side and the oil inlet parallel connection of right main governor valve 12.
Left front governor valve 7, right front governor valve 8, left back governor valve 9, right back governor valve 10, left main governor valve 11 and right main governor valve 12 are the throttle type governor valve.
The principle of work of the utility model is following:
When 25 ton forklift car loads are fully loaded when hoisting; The high pressure oil that hydraulic efficiency pressure system is supplied with multiway valve 1 is supplied with left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4, right front lift oil tank 5 separately through hoist valve block 14 and multiway valve safety valve 15 and left main governor valve 11, the right main governor valve 12 of this system; Accomplish the weight motion that hoists; Because the back lift oil tank is different with preceding lift oil tank oil cylinder cylinder diameter; Left front lift oil tank 4, right front lift oil tank 5 cylinder diameters are bigger than normal than left back lift oil tank 2, right back lift oil tank 3 cylinder diameters; So left front lift oil tank 4, right front lift oil tank 5 action earlier; Accomplish etc. left front lift oil tank 4, right front lift oil tank 5 that and then left back lift oil tank 2, right back lift oil tank 3 begin to hoist behind the whole play motion; Also accomplish the action that hoists of left back lift oil tank 2, right back lift oil tank 3 effective travels, left front governor valve 7, right front governor valve 8, left back governor valve 9, right back governor valve 10, left main governor valve 11 and right main governor valve 12 all are unidirectional opening in weight hoists process, do not play throttling action; Fluid in left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4 and right front lift oil tank 5 rod chambers to hydraulic reservoir 13, is accomplished the whole door frame process that hoists through oil return line 6 oil returns; When the needs weight descends; The valve block 14 that hoists in the multiway valve 1 switches to main in-line the way to cycle oil of multiway valve 1; The oil circuit that hoists of complete free door frame pipeline system just communicates with hydraulic reservoir 13, and under the weight action of gravity, the hydraulic oil liquid in left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4 and right front lift oil tank 5 rodless cavities arrives hydraulic reservoir 13 through the oil return of oil-feed path; Weight begins to descend; Because there is second throttle, and the drainback passage of left back lift oil tank 2, right back lift oil tank 3, left front lift oil tank 4, right front lift oil tank 5 is uneven in length, in the oil circuit of left front lift oil tank 4, right front lift oil tank 5 between two throttle type governor valves connecting line longer; Left back lift oil tank 2, right back lift oil tank 3 action earlier that preferential pipe passage is short; Fluid is got back to hydraulic reservoir 13 earlier in then left back lift oil tank 2, right back lift oil tank 3 rodless cavities, treats left back lift oil tank 2, when right back lift oil tank 3 drops to cylinder bottom, the hydraulic reservoir 13 that begins to reflux of the hydraulic oil in left front lift oil tank 4, right front lift oil tank 5 rodless cavities; Effectively avoided the pressure interference; Realized that preceding lift oil tank and back lift oil tank hoist and the rational sequence of the process action that descends, that is: left front lift oil tank 4, right front lift oil tank 5 are accomplished the action that hoists earlier, back completion down maneuver; Left back lift oil tank 2, right back lift oil tank 3 are accomplished down maneuvers earlier, and the action that hoists is accomplished in the back; There are back pressure in door frame left back lift oil tank 2, right back lift oil tank 3 and left front lift oil tank 4, right front lift oil tank 5 rod chambers in the decline process; Mend in the rod chamber of oil cylinder from hydraulic reservoir 13 oil suctions through pipeline 6; The balance negative pressure can solve the cylinder block in-to-in on the other hand and lubricate on the one hand; This moment, left main governor valve 11 worked with right main governor valve 12, second throttle, and the door frame order steadily descends; The complete free door frame of 25 ton forklifts, two joints this moment is accomplished a complete process that hoists and decline process.

Claims (2)

1.25 the hydraulic efficiency pressure system of the complete free door frame of ton forklift two joints comprises multiway valve (1), left back lift oil tank (2), right back lift oil tank (3), left front lift oil tank (4), right front lift oil tank (5) and hydraulic reservoir (13); Said multiway valve (1) comprises valve block that hoists (14) and safety valve (15); The said valve block that hoists (14) is three six-way valves; The oil outlet A of valve block (14) of hoisting is being communicated with the oil inlet of multiway valve safety valve (15); Multiway valve safety valve (15) oil outlet direct connection hydraulic reservoir (13), the valve block that hoists (14) is provided with oil inlet P; The rod chamber of said left back lift oil tank (2), right back lift oil tank (3), left front lift oil tank (4) and right front lift oil tank (5) is communicated to hydraulic reservoir (13) through pipeline respectively; The rodless cavity of said left back lift oil tank (2) is being communicated with the oil outlet of left back governor valve (9) through pipeline, and the rodless cavity of said right back lift oil tank (3) is being communicated with the oil outlet of right back governor valve (10) through pipeline; The rodless cavity of said left front lift oil tank (4) is being communicated with the oil outlet of left front governor valve (7) through pipeline, and the rodless cavity of said right front lift oil tank (5) is being communicated with the oil outlet of right front governor valve (8) through pipeline; It is characterized in that: the oil inlet of the oil inlet of said left back governor valve (9) and left front governor valve (7) is parallelly connected, and is being communicated with the oil outlet of left main governor valve (11); The oil inlet of the oil inlet of said right back governor valve (10) and right front governor valve (8) is parallelly connected, and is being communicated with the oil outlet of right main governor valve (12); The oil outlet A that is being communicated with the valve block that hoists (14) after the oil inlet of the main governor valve in a left side (11) and the oil inlet parallel connection of right main governor valve (12).
2. the hydraulic efficiency pressure system of the complete free door frame of 25 ton forklifts, two joints according to claim 1, it is characterized in that: said left front governor valve (7), right front governor valve (8), left back governor valve (9), right back governor valve (10), left main governor valve (11) and right main governor valve (12) are the throttle type governor valve.
CN2012201407609U 2012-04-06 2012-04-06 Hydraulic system of two full-free door frames of 25-ton forklift Active CN202542791U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012201407609U CN202542791U (en) 2012-04-06 2012-04-06 Hydraulic system of two full-free door frames of 25-ton forklift

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012201407609U CN202542791U (en) 2012-04-06 2012-04-06 Hydraulic system of two full-free door frames of 25-ton forklift

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103601138A (en) * 2013-11-29 2014-02-26 三一集团有限公司 Gantry chain fracture protecting system and stacking machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103601138A (en) * 2013-11-29 2014-02-26 三一集团有限公司 Gantry chain fracture protecting system and stacking machine

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