CN102701119B - Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast - Google Patents
Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast Download PDFInfo
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- CN102701119B CN102701119B CN201210209042.7A CN201210209042A CN102701119B CN 102701119 B CN102701119 B CN 102701119B CN 201210209042 A CN201210209042 A CN 201210209042A CN 102701119 B CN102701119 B CN 102701119B
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Abstract
The invention relates to a forward-shift impact preventing hydraulic system for a forward-shift type fork truck mast. The forward-shift impact preventing hydraulic system consists of a mast forward-shift oil cylinder and a mast forward-shift valve block of a multi-path valve, wherein an oil inlet P of the mast forward-shift valve block is connected with a system oil supply oil path; an oil return port T is connected with a system oil return path, a first work oil port A is connected with a rodless cavity of a forward-shift oil cylinder 1; a second work oil port B is connected with a rod cavity of the forward-shift oil cylinder 1; and the mast forward-shift valve block comprises a three-position and six-way reversing valve, a first oil-supplementing one-way valve and a second oil-supplementing one-way valve. According to the forward-shift impact preventing hydraulic system disclosed by the invention, the problem that the mast freely shakes in a track due to the fact that emergency brake occurs in the combined operation process of the driving of a forward-shift type fork truck and the forward-backward shift of the mast is effectively solved; and a self-locking valve and the oil-supplemented one-way valves are arranged in the valve rod of the mast forward-shift valve block, and thus the structure is compact and the cost is low. The oil-supplemented one-way valves are arranged in the valve block, and thus short oil channel, quick oil supplementation and favorable effect are realized; and the forward-shift impact preventing hydraulic system disclosed by the invention has the advantages of stability in work and safety in use.
Description
Technical field
The invention belongs to fork truck technical field, be specifically related to the hydraulic efficiency pressure system of forklift door frame.
Background technology
Reach truck is widely used in the narrower operation occasions of passage such as warehouse, supermarket, factory floor because of its maneuverability, crossing ability and good stability.The door frame of reach truck can, along the track reach of an inboard leg, be convenient to pitch picking thing.During walking, door frame returns to along the track of an inboard leg midway location that approaches car body, makes center of gravity of goods in bearing surface, the stability while guaranteeing fork truck operation.Wherein moving forward and backward by hydraulic efficiency pressure system of door frame controlled realization.Common reach truck in the process of moving, handle simultaneously door frame reach or after move.If run into obstacle, need implement emergency braking, door frame move operation also needs to stop simultaneously, door frame can continue a mobile segment distance due to inertia reason, and now the flow of pump fuel feed can not meet the requirement of door frame reach oil cylinder running velocity, in reach oil cylinder, there will be one section of idle travel, if at this moment proceed again vehicle to run, door frame can be in track Free Slosh.Moving velocity is faster, and door frame rocks just more serious, has affected the safety of driving.Fig. 2 is the hydraulic scheme of common front loading type forklift gantry reach, it is comprised of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiple directional control valve, cannot solve reach truck cut and problem of door frame Free Slosh in track of causing in joint operations principle.
Summary of the invention
In order to solve reach truck cut and the problem of door frame Free Slosh in track of causing, by structural development, the invention provides a kind of simple, stable, safe front loading type forklift gantry reach protecting against shock hydraulic efficiency pressure system in joint operations.
Concrete technical solution of the present invention is as follows:
Front loading type forklift gantry reach protecting against shock hydraulic efficiency pressure system is comprised of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiway valve; The oil inlet P connected system of door frame reach valve block 2 supplies oil circuit, oil return inlet T connected system oil return line, and the first actuator port A connects the rodless cavity of door frame reach oil cylinder 1, and the second actuator port B connects the rod chamber of door frame reach oil cylinder 1;
Described door frame reach valve block 2 comprises three six-way transfer valves 3, the first repairing check valve 5 and the second repairing check valve 4; The first return opening C of three six-way transfer valves 3 communicates with the back oil road 12 of door frame reach valve block 2 by the first three-way pipeline 13; Back oil road 12 one end are being communicated with the oil return inlet T of door frame reach valve block 2, and the other end communicates with the first interface of four-way pipeline 14; The second return opening G of three six-way transfer valves 3 is connected with the second interface of four-way pipeline 14; The first oil inlet D of three six-way transfer valves 3, the second oil inlet E communicate with the oil inlet P of door frame reach valve block 2 by the second three-way pipeline 8, and the second oil inlet E place is provided with inlet one-way valve; The first actuator port F of three six-way transfer valves 3 is by the 3rd three-way pipeline 9, one end is communicated to the first actuator port A of door frame reach valve block 2, the other end is communicated with the oil outlet of the first repairing check valve 5, and the oil inlet of the first repairing check valve 5 communicates with the 3rd interface of four-way pipeline 14; The second actuator port H of three six-way transfer valves 3 is by the 4th three-way pipeline 10, one end is communicated to the second actuator port B of door frame reach valve block 2, the other end is communicated with the oil outlet of the second repairing check valve 4, and the oil inlet of the second repairing check valve 4 communicates with the 4th interface of four-way pipeline 14; Three six-way transfer valves 3 are when meta, and the first oil inlet D and the second return opening G connect; When three six-way transfer valves 3 commutate to left position, the second oil inlet E and the second actuator port H connect, and the first actuator port F and the first return opening C connect; When three six-way transfer valves 3 commutate to right position, the second oil inlet E connects by the 5th three-way pipeline 11 one end and the first actuator port F, the other end is introduced into pressure oil by oil circuit control 7 the control port K of latching valve 6, the second actuator port H of three six-way transfer valves 3 is communicated with the oil inlet I of latching valve 6, and the oil outlet J of latching valve 6 and the first return opening C connect.
Useful technique effect of the present invention embodies in the following areas:
The present invention effectively solved reach truck travel and door frame before and after the problem of door frame Free Slosh in track of causing because of emergency braking in moving joint operations.The present invention is simple in structure, working stability, use safety;
The present invention reach valve block valve rod in built-in latching valve and repairing check valve, compact conformation, cost is low; Built-in repairing check valve in valve block wherein, oil duct is short, and repairing is rapid, effective.
Accompanying drawing explanation
Fig. 1 moves hydraulic scheme before and after front loading type forklift gantry of the present invention.
Fig. 2 moves hydraulic scheme before and after prior art front loading type forklift gantry.
Sequence number in upper figure: door frame reach oil cylinder 1, door frame reach valve block 2, three six-way transfer valves 3, the second repairing check valve 4, the first repairing check valve 5, latching valve 6, oil circuit control 7, the second three-way pipeline 8, the 3rd three-way pipeline 9, the 4th three-way pipeline 10, the 5th three-way pipeline 11, back oil road 12, the first three-way pipeline 13, four-way pipeline 14.
The specific embodiment
Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.
Embodiment
Referring to Fig. 1, front loading type forklift gantry reach protecting against shock hydraulic efficiency pressure system is comprised of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiway valve; The oil inlet P connected system of door frame reach valve block 2 supplies oil circuit, oil return inlet T connected system oil return line, and the first actuator port A connects the rodless cavity of door frame reach oil cylinder 1, and the second actuator port B connects the rod chamber of door frame reach oil cylinder 1; Door frame reach valve block 2 comprises three six-way transfer valves 3, the first repairing check valve 5 and the second repairing check valve 4; The first return opening C of three six-way transfer valves 3 communicates with the back oil road 12 of door frame reach valve block 2 by the first three-way pipeline 13; Back oil road 12 one end are being communicated with the oil return inlet T of door frame reach valve block 2, and the other end communicates with the first interface of four-way pipeline 14; The second return opening G of three six-way transfer valves 3 is connected with the second interface of four-way pipeline 14; The first oil inlet D of three six-way transfer valves 3, the second oil inlet E communicate with the oil inlet P of door frame reach valve block 2 by the second three-way pipeline 8, and the second oil inlet E place is provided with inlet one-way valve; The first working hole F of three six-way transfer valves 3 is by the 3rd three-way pipeline 9, one end is communicated to the first actuator port A of door frame reach valve block 2, the other end is communicated with the oil outlet of the first repairing check valve 5, and the oil inlet of the first repairing check valve 5 communicates with the 3rd interface of four-way pipeline 14; The second working hole H of three six-way transfer valves 3 is by the 4th three-way pipeline 10, one end is communicated to the second actuator port B of door frame reach valve block 2, the other end is communicated with the oil outlet of the second repairing check valve 4, and the oil inlet of the second repairing check valve 4 communicates with the 4th interface of four-way pipeline 14; Three six-way transfer valves 3 are when meta, and the first oil inlet D and the second return opening G connect; When three six-way transfer valves 3 commutate to left position, the second oil inlet E and the second actuator port H connect, and the first actuator port F and the first return opening C connect; When three six-way transfer valves 3 commutate to right position, the second oil inlet E connects by the 5th three-way pipeline 11 one end and the first actuator port F, the other end is introduced into pressure oil by oil circuit control 7 the control port K of latching valve 6, the second actuator port H of three six-way transfer valves 3 is communicated with the oil inlet I of latching valve 6, and the oil outlet J of latching valve 6 and the first return opening C connect.When described latching valve 6 only has pressure oil and pressure to reach certain value in control port K, oil inlet I could connect with oil outlet J.
Principle of work of the present invention: when three six-way transfer valves 3 are during in meta, hydraulic oil moves forward the oil inlet P of valve block 2 through the first oil inlet D, the second return opening G of three six-way transfer valves 3 by door frame, by four-way pipeline 14, back oil road 12, connect back hydraulic reservoir with oil return inlet T again, door frame reach oil cylinder 1 is failure to actuate.
When needs door frame moves forward, operate three six-way transfer valves 3 to right position, pressure oil, by the door frame rodless cavity that the oil inlet P of valve block 2 is transported to door frame reach oil cylinder 1 through the second oil inlet E, the first actuator port F of three six-way transfer valves 3 through the first actuator port A of door frame reach valve block 2 that moves forward, promotes door frame reach; Pressure oil enters the control port K of latching valve 6 by the oil circuit control 7 of drawing between the second oil inlet E and the first actuator port F simultaneously, open latching valve 6, the oil inlet I of latching valve 6 and oil outlet J are connected, the hydraulic oil of the rod chamber output of door frame reach oil cylinder 1 is communicated with oil return inlet T through three six-way transfer valves, 3 second actuator port H, latching valve 6, the first return opening C by the second actuator port B of door frame reach valve block 2.If run into obstacle, need implement emergency braking, the operation of door frame reach simultaneously also will stop, drive the motor of oil pump to shut down, door frame can have due to inertia the trend of preshoot, now the flow of pump fuel feed can not meet the requirement of door frame reach oil cylinder running velocity, oil circuit charge oil pressure reduces, and at this moment latching valve 6 cuts out because control port K pressure oil reduces.Door frame reach action is limited, on the other hand, because latching valve 6 cuts out and needs the time, door frame reach oil cylinder 1 rodless cavity produces negative pressure suction sky owing to impacting, the first repairing check valve 5 is opened, hydraulic oil in the oil return line 12 of door frame reach valve block 2 carries out repairing by 5 pairs of door frame reach oil cylinder 1 rodless cavities of the first repairing check valve, prevents that oil cylinder from causing door frame Free Slosh in track because inhaling sky.
While moving after door frame, operate three six-way transfer valves 3 to left position, pressure oil is transported to the rod chamber of door frame reach oil cylinder 1 by the move forward oil inlet P of valve block 2 of door frame by the second actuator port B of door frame reach valve block 2 through the second oil inlet E, the second actuator port H of three six-way transfer valves 3, promote to move after door frame, the fluid of door frame reach oil cylinder 1 rodless cavity is communicated with oil return inlet T by move forward the first actuator port A of valve block 2, three six-way transfer valve 3 first actuator port F, the first return opening C of door frame.If the mobile cut of doing is handled after door frame, three six-way transfer valves 3 are got back to meta, because producing door frame reach oil cylinder 1 rod chamber, inertia produces negative pressure emptying phenomenon, the second repairing check valve 4 is opened, hydraulic oil in the oil return line 12 of door frame reach valve block 2 carries out repairing by 4 pairs of door frames reach oil cylinder 1 rod chambers of the second repairing check valve, prevent because of reach oil cylinder after because inertia produces, inhale the empty Free Slosh that causes door frame to produce in track in moving past journey.
Claims (1)
1. front loading type forklift gantry reach protecting against shock hydraulic efficiency pressure system, is comprised of the door frame of door frame reach oil cylinder (1) and the multiway valve valve block (2) that moves forward; The oil inlet P connected system of door frame reach valve block (2) supplies oil circuit, oil return inlet T connected system oil return line, and the first actuator port A connects the rodless cavity of door frame reach oil cylinder (1), and the second actuator port B connects the rod chamber of door frame reach oil cylinder (1); It is characterized in that:
Described door frame reach valve block (2) comprises three six-way transfer valves (3), the first repairing check valve (5) and the second repairing check valve (4); The first return opening C of three six-way transfer valves (3) communicates with the back oil road (12) of door frame reach valve block (2) by the first three-way pipeline (13); Back oil road (12) one end is being communicated with the oil return inlet T of door frame reach valve block (2), and the other end communicates with the first interface of four-way pipeline (14); The second return opening G of three six-way transfer valves (3) is connected with the second interface of four-way pipeline (14); The first oil inlet D of three six-way transfer valves (3), the second oil inlet E communicate with the oil inlet P of door frame reach valve block (2) by the second three-way pipeline (8), and the second oil inlet E place is provided with inlet one-way valve; The first actuator port F of three six-way transfer valves (3) is by the 3rd three-way pipeline (9), one end is communicated to the first actuator port A of door frame reach valve block (2), the other end is communicated with the oil outlet of the first repairing check valve (5), and the oil inlet of the first repairing check valve (5) communicates with the 3rd interface of four-way pipeline (14); The second actuator port H of three six-way transfer valves (3) is by the 4th three-way pipeline (10), one end is communicated to the second actuator port B of door frame reach valve block (2), the other end is communicated with the oil outlet of the second repairing check valve (4), and the oil inlet of the second repairing check valve (4) communicates with the 4th interface of four-way pipeline (14); Three six-way transfer valves (3) are when meta, and the first oil inlet D and the second return opening G connect; When three six-way transfer valves (3) commutate to left position, the second oil inlet E and the second actuator port H connect, and the first actuator port F and the first return opening C connect; When three six-way transfer valves (3) commutate to right position, the second oil inlet E connects by the 5th three-way pipeline (11) one end and the first actuator port F, the other end is introduced into pressure oil by oil circuit control (7) the control port K of latching valve (6), the second actuator port H of three six-way transfer valves (3) is communicated with the oil inlet I of latching valve (6), and the oil outlet J of latching valve (6) and the first return opening C connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210209042.7A CN102701119B (en) | 2012-06-25 | 2012-06-25 | Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210209042.7A CN102701119B (en) | 2012-06-25 | 2012-06-25 | Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast |
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| CN102701119A CN102701119A (en) | 2012-10-03 |
| CN102701119B true CN102701119B (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210209042.7A Active CN102701119B (en) | 2012-06-25 | 2012-06-25 | Forward-shift impact preventing hydraulic system for forward-shift type fork truck mast |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104030199B (en) * | 2014-05-26 | 2017-02-15 | 安徽合力股份有限公司 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
| CN111547653B (en) * | 2020-05-19 | 2021-10-29 | 三一海洋重工有限公司 | Fork leveling system and method and telescopic arm forklift |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE527273C2 (en) * | 2003-07-03 | 2006-01-31 | Bt Ind Ab | Balancing system for lifting truck, comprises cylinder and pressure accumulators connected to hydraulic pump via inlet valve |
| JP2005098455A (en) * | 2003-09-26 | 2005-04-14 | Mitsubishi Heavy Ind Ltd | Hydraulic controller of industrial machinery |
| CN201545673U (en) * | 2009-11-19 | 2010-08-11 | 浙江杭叉工程机械集团股份有限公司 | Hydraulic system for forklift |
| CN102134047B (en) * | 2011-02-15 | 2013-05-15 | 安徽合力股份有限公司 | Energy-saving hydraulic system of electric forklift |
| CN202643255U (en) * | 2012-06-25 | 2013-01-02 | 安徽合力股份有限公司 | Forward shift anti-impact hydraulic system of mast of reach fork lift truck |
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