CN102701119A - 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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- CN102701119A CN102701119A CN2012102090427A CN201210209042A CN102701119A CN 102701119 A CN102701119 A CN 102701119A CN 2012102090427 A CN2012102090427 A CN 2012102090427A CN 201210209042 A CN201210209042 A CN 201210209042A CN 102701119 A CN102701119 A CN 102701119A
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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 the 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 be convenient to fork and get goods along the track reach of an inboard leg.Door frame returns to the midway location near car body along the track of an inboard leg during walking, makes the goods center of gravity in bearing surface, the stability when guaranteeing the 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.Need implement emergency braking if run into obstacle; The door frame move operation also need stop simultaneously; Door frame can continue to move a segment distance owing to the inertia reason, and the flow of pump fuel feed can not satisfy the requirement of door frame reach oil cylinder running velocity at this moment, can occur one section idle travel in the reach oil cylinder; If at this moment proceed vehicle to run again, door frame can be in track Free Slosh.Moving velocity is fast more, and door frame rocks just serious more, has influenced the safety of driving.Fig. 2 is the hydraulic scheme of common reach truck door frame reach; It is made up of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiple directional control valve, can't solve on principle that reach truck stops suddenly and the problem of door frame Free Slosh in track of causing joint operations.
Summary of the invention
In order to solve that reach truck stops suddenly in joint operations and the problem of door frame Free Slosh in track of causing, through structural development, the present invention provides a kind of simple, stable, safe reach truck door frame reach protecting against shock hydraulic efficiency pressure system.
Concrete technical solution of the present invention is following:
Reach truck door frame reach protecting against shock hydraulic efficiency pressure system is made up of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiway valve; The oil inlet P connected system fuel feeding road of door frame reach valve block 2, oil return inlet T connected system oil return line, the first actuator port A connect 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;
Said 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 through the back oil road 12 of first three-way pipeline 13 with door frame reach valve block 2; Back oil road 12 1 ends are being communicated with the oil return inlet T of door frame reach valve block 2, and the other end communicates with first interface of four-way pipeline 14; The second return opening G of three six-way transfer valves 3 links to each other with 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 through the oil inlet P of second three-way pipeline 8 with door frame reach valve block 2, 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 through 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 through 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; When three six-way transfer valves 3 were in meta, the first oil inlet D and the second return opening G connected; When three six-way transfer valves 3 commutated to position, a left side, the second oil inlet E and the second actuator port H connected, and the first actuator port F and the first return opening C connect; When three six-way transfer valves 3 commutate to right; The second oil inlet E connects through the 5th three-way pipeline 11 1 ends and the first actuator port F; The other end is introduced into pressure oil through control oil channel 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 solved effectively reach truck go with door frame before and after move the problem of door frame Free Slosh in track of causing because of emergency braking in the joint operations.The present invention is simple in structure, working stability, safe in utilization;
The present invention the 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, and is effective.
Description of drawings
Fig. 1 is for moving hydraulic scheme before and after the reach truck door frame of the present invention.
Fig. 2 is for moving hydraulic scheme before and after the prior art reach truck door frame.
Sequence number among the last 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, control oil channel 7, 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, first three-way pipeline 13, four-way pipeline 14.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is done explanation further through embodiment.
Embodiment
Referring to Fig. 1, reach truck door frame reach protecting against shock hydraulic efficiency pressure system is made up of the door frame reach valve block 2 of door frame reach oil cylinder 1 and multiway valve; The oil inlet P connected system fuel feeding road of door frame reach valve block 2, oil return inlet T connected system oil return line, the first actuator port A connect 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 through the back oil road 12 of first three-way pipeline 13 with door frame reach valve block 2; Back oil road 12 1 ends are being communicated with the oil return inlet T of door frame reach valve block 2, and the other end communicates with first interface of four-way pipeline 14; The second return opening G of three six-way transfer valves 3 links to each other with 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 through the oil inlet P of second three-way pipeline 8 with door frame reach valve block 2, 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 through 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 through 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; When three six-way transfer valves 3 were in meta, the first oil inlet D and the second return opening G connected; When three six-way transfer valves 3 commutated to position, a left side, the second oil inlet E and the second actuator port H connected, and the first actuator port F and the first return opening C connect; When three six-way transfer valves 3 commutate to right; The second oil inlet E connects through the 5th three-way pipeline 11 1 ends and the first actuator port F; The other end is introduced into pressure oil through control oil channel 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 said latching valve 6 only had 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 in meta; Hydraulic oil is through the first oil inlet D, the second return opening G of three six-way transfer valves 3 of oil inlet P warp of door frame reach valve block 2; Connect back hydraulic reservoir through four-way pipeline 14, back oil road 12 with oil return inlet T again, door frame reach oil cylinder 1 is failure to actuate.
When the needs door frame moves forward; Operate three six-way transfer valves 3 to right position; The oil inlet P of pressure oil through door frame reach valve block 2 through the rodless cavity that the first actuator port A of door frame reach valve block 2 is transported to door frame reach oil cylinder 1, promotes the door frame reach through the second oil inlet E of three six-way transfer valves 3, the first actuator port F; Pressure oil gets into the control port K of latching valve 6 through the control oil channel 7 of drawing between the second oil inlet E and the first actuator port F simultaneously; Open latching valve 6; Oil inlet I and the oil outlet J of latching valve 6 are connected, make the hydraulic oil of rod chamber output of door frame reach oil cylinder 1 be communicated with oil return inlet T through three six-way transfer valve 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.Need implement emergency braking if run into obstacle; The operation of door frame reach simultaneously also will stop; The motor that drives oil pump shuts down, and door frame can be because inertia has the trend of preshoot, and this moment, the flow of pump fuel feed can not satisfy the requirement of door frame reach oil cylinder running velocity; The oil circuit charge oil pressure reduces, and at this moment latching valve 6 cuts out owing to 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 moves forward oil cylinder 1 rodless cavity because impact generation negative pressure is inhaled sky, and 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 through 5 pairs of door frame reaches of first repairing check valve oil cylinder, 1 rodless cavity, prevents that oil cylinder from causing door frame Free Slosh in track because of inhaling sky.
When moving behind the door frame; Operate three six-way transfer valves 3 to position, a left side; Pressure oil is through the second oil inlet E of three six-way transfer valves 3 of oil inlet P warp of door frame reach valve block 2, the second actuator port H is transported to door frame reach oil cylinder 1 by the second actuator port B of door frame reach valve block 2 rod chamber; Promote to move behind the door frame, the fluid of door frame reach oil cylinder 1 rodless cavity is communicated with oil return inlet T through the first actuator port A, three six-way transfer valve 3 first actuator port F, the first return opening C of door frame reach valve block 2.Stop to handle if move behind the door frame suddenly; Three six-way transfer valves 3 are got back to meta; Because of producing door frame reach oil cylinder 1 rod chamber, inertia produces the negative pressure emptying phenomenon; Then the second repairing check valve 4 is opened, and the hydraulic oil in the oil return line 12 of door frame reach valve block 2 carries out repairing through 4 pairs of door frames reaches of second repairing check valve oil cylinder, 1 rod chamber, prevent because of the reach oil cylinder after move past in the journey and inhale the empty Free Slosh that causes door frame in track, to produce because of inertia produces.
Claims (1)
1. reach truck door frame reach protecting against shock hydraulic efficiency pressure system is made up of the door frame reach valve block (2) of door frame reach oil cylinder (1) and multiway valve; The oil inlet P connected system fuel feeding road of door frame reach valve block (2), oil return inlet T connected system oil return line, 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);
Said 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 through the back oil road (12) of first three-way pipeline (13) with door frame reach valve block (2); Back oil road (12) one ends are being communicated with the oil return inlet T of door frame reach valve block (2), and the other end communicates with first interface of four-way pipeline (14); The second return opening G of three six-way transfer valves (3) links to each other with 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 through the oil inlet P of second three-way pipeline (8) with door frame reach valve block (2), 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 through 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 through 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 being in meta, and the first oil inlet D and the second return opening G connect; When three six-way transfer valves (3) commutated to position, a left side, the second oil inlet E and the second actuator port H connected, and the first actuator port F and the first return opening C connect; When three six-way transfer valves (3) commutate to right; The second oil inlet E connects through the 5th three-way pipeline (11) one ends and the first actuator port F; The other end is introduced into pressure oil through control oil channel (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 |
|---|---|---|---|
| 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 true CN102701119A (en) | 2012-10-03 |
| CN102701119B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030199A (en) * | 2014-05-26 | 2014-09-10 | 安徽合力股份有限公司 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
| CN111547653A (en) * | 2020-05-19 | 2020-08-18 | 三一海洋重工有限公司 | Fork leveling system and method and telescopic arm forklift |
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| JP2005098455A (en) * | 2003-09-26 | 2005-04-14 | Mitsubishi Heavy Ind Ltd | Hydraulic controller of industrial machinery |
| 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 |
| 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 |
| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 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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2012
- 2012-06-25 CN CN201210209042.7A patent/CN102701119B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1846068A (en) * | 2003-09-26 | 2006-10-11 | 三菱重工业株式会社 | Hydraulic control device of industrial machinery |
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| CN102134047A (en) * | 2011-02-15 | 2011-07-27 | 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104030199A (en) * | 2014-05-26 | 2014-09-10 | 安徽合力股份有限公司 | Forklift hydraulic system with bypass oil way throttling speed regulation loop |
| CN111547653A (en) * | 2020-05-19 | 2020-08-18 | 三一海洋重工有限公司 | Fork leveling system and method and telescopic arm forklift |
| 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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| CN102701119B (en) | 2014-04-16 |
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