CN201254447Y

CN201254447Y - Forklifts multi-way valve with outlay type inclined lock

Info

Publication number: CN201254447Y
Application number: CNU2008200363452U
Authority: CN
Inventors: 温跃清; 刘瑾
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-05-21
Filing date: 2008-05-21
Publication date: 2009-06-10
Anticipated expiration: 2018-05-21

Abstract

The utility model relates to a forklift multi-channel valve which is provided with an external inclined lock, and solves the problems that the self-locking structure in prior inclined valve sheet has the disadvantages that the technique is complex, the production cost is high, and the self locking is easy to lose effectiveness. The forklift multi-channel valve has the improved structure that: a valve bar of the inclined valve sheet is an O-shaped valve bar; an A2 load control valve is arranged at a working hole A2 arranged at the upper part of a working cavity A thereof; and a B2 load control valve is arranged at a working hole B2 arranged at the upper part of a working cavity B when required. The improved structure of the forklift multi-channel valve has the advantages that the technique is simplified, the processing period is shortened, the efficiency is improved, and the over-high back pressure of the inclined cylinder can be eliminated (the maximum pressure is the pressure set by the load control valve) so as to reduce the damage to the hydraulic system components; the phenomenon of self-locking valve shaking, self-locking malfunction or inability of opening, or even the automatic forward tipping when the door bracket is at still state can be eliminated; in addition, the load control valve can be simultaneously set in the A cavity and B cavity of the multi-channel valve, so as to meet the requirements of different forklift working conditions.

Description

Fork truck multiway valve with externally positioned type tilt lock

Technical field

The utility model relates to the multiway valve that fork truck uses.

Background technology

The fabricate block that the multiway valve that fork truck uses is made up of as main body two or more chip change-over valves, the while is in conjunction with the handling characteristics of fork truck, and a kind of dedicated hydraulic valve of exploitation.General fork truck hydraulic part mainly is made up of the dump ram (drive door frame) of two parallel connections and two single-acting lift oil tanks (drive pallet fork), knuckle section (comprise deflector and turn to oil cylinder), Hydraulic Pump, multiway valve, pipeline fuel tank etc.The requirement system can realize that hoisting of pallet fork descends and the anteversion and retroversion of door frame and car body function such as turn to.Because the space of fork truck is limit, a multiple directional control valve must all be finished these actions.And be when the engine off from the important requirement that security standpoint proposes fork truck, reason maloperation handle and the danger that goods is tumbled takes place not, corresponding multiway valve requires to set auto-lock function in the connection part that tilts, promptly when the no pressure of control oil, the pressure of an oil pocket can remain on some values voluntarily, and irrelevant with commutation.At present, the following fork truck multiway valve of domestic 16T all adopts in valve rod structures such as dress self-locking spool (latching valve), spring when door frame leans forward, and satisfies the lean forward safety requirements of self-locking of fork truck.For this built-in version, there is more problem in the existing production work: 1, be installed in the valve rod owing to this self-locking spool, so the requirement on machining accuracy of valve rod hole is very high, complex process, need 33 procedures, 40 days production cycles, process-cycle and cost increase by 3～4 times than common valve rod, product quality 60-70%.2, the problems such as quality of fit of self-locking spool in valve rod latching valve can occur and not open, cause door frame be failure to actuate or self-locking malfunctioning, the door frame phenomenon that leans forward automatically appears, potential safety hazard is serious, fault rate reaches 30-40%.3, when forklift door frame leans forward,, cause the damage of hydraulic efficiency pressure system element easily owing to, therefore can produce very high back pressure (being up to 40MPa) by 5～6 apertures (Φ 0.8～Φ 1.1) oil extraction that is staggered on the valve rod.4, the self-locking spool can only be arranged on the A2 chamber or the B2 chamber of multiway valve, as fork truck the requirement of two chamber self-lockings is arranged, and then can't realize.

Summary of the invention

The processing technology complexity that exists for the self-locking structure that solves existing inclination valve block, easy problem such as self-locking inefficacy, the purpose of this utility model provide a kind of fork truck multiway valve with externally positioned type tilt lock of simple in structure, reliable operation.

Concrete structural development scheme is as follows:

Fork truck multiway valve with externally positioned type tilt lock, comprise oil-feed valve block 1, the valve block 2 that hoists, inclination valve block 3 and oil return valve block 4, the valve block 3 that wherein tilts comprises valve body, valve rod, epitrochoidal chamber A and epitrochoidal chamber B, and epitrochoidal chamber A top is being communicated with working hole A2, and epitrochoidal chamber B top is being communicated with working hole B2;

Described valve rod is an O type valve rod, and the working hole A2 place on described epitrochoidal chamber A top is provided with A2 Load Control Valve 8.

The working hole mouth B2 place on described epitrochoidal chamber B top is provided with B2 Load Control Valve 17.

The utlity model has the useful technique effect of several respects:

1, simplified processing technology, production technology is reduced to 24 procedures, has shortened the process-cycle, and the production cycle was reduced to 7 days, and product quality is brought up to 95-98%, and productive costs has reduced nearly 1/3rd; Fault rate is reduced to 5-6%, effectively reduces potential safety hazard; And assembling is simple, and easy to maintenance, commonality is good.

2, can eliminate inclined cylinder back pressure too high (top pressure is exactly the pressure that Load Control Valve is set), reduce damage the hydraulic efficiency pressure system element.

3, can eliminate that latching valve is trembled, self-locking is malfunctioning or do not open even door frame has phenomenon such as lean forward automatically when static.

4, can Load Control Valve be set simultaneously in multiway valve A chamber and B chamber, satisfy the requirement of the different operating modes of fork truck.

5, of the present utility model applying, raising is significant to fork truck industry hydraulic efficiency pressure system performance.

Description of drawings

Fig. 1 is the utility model structural representation,

Fig. 2 is the C-C cutaway view of Fig. 1,

Fig. 3 is the K-K cutaway view of Fig. 2,

Fig. 4 is provided with the Load Control Valve structural representation for the twoport of Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Embodiment 1:

Referring to Fig. 1, Fig. 2 and Fig. 3, fork truck multiway valve with externally positioned type tilt lock comprises oil-feed valve block 1, the valve block 2 that hoists, inclination valve block 3 and oil return valve block 4, the valve block that wherein tilts comprises valve rod 6, epitrochoidal chamber A16, epitrochoidal chamber B12, back oil road 11, triangle oil duct 13, meta oil duct 14, go in ring oil duct 15 and check valve 10, and retainer spring 9 is equipped with in valve rod 6 ends; Epitrochoidal chamber A16 top is being communicated with working hole A2, and epitrochoidal chamber B top is being communicated with working hole B2; Wherein valve rod 6 is an O type valve rod, and the working hole A2 place on epitrochoidal chamber A top is provided with A2 Load Control Valve 7, and epitrochoidal chamber B top is being communicated with working hole B2 and is being stopped up by plug screw 5.

When O type valve rod 6 is moved to right (realization is leaned forward), compression spring 9, valve body 7 meta oil ducts 14 are shut by O type valve rod 6, the pressure oil that main pump comes out arrives valve body 7 through the triangle oil duct 13 of oil-feed valve block 1, the valve block 2 that hoists, triangle oil duct 13 is opened check valve 10 on the valve body, enters valve body 7 belt oil ducts 15, and one side is through the opening of O type valve rod 6, to epitrochoidal chamber B12 (plug screw 5 stops up), again through the rodless cavity 18 of accent B2 to dump ram.Because the effect of load (pressure oil), dump ram rodless cavity 18 pressure oils promote piston.This moment, the pressure oil of cylinder rod chamber 19 is opened A2 chamber Load Control Valve 8 (needing certain pressure) through working hole A2, enters O type valve rod 6 opening gears, to back oil road 11 oil sump tanks of valve body 7.Make the forklift door frame forward swing.

During door frame hypsokinesis action, pull out O type valve rod 6 (valve rod moves to left), enter valve body 7 triangle oil ducts 13 as above-mentioned fluid and open check valve 10 on the valve body, enter valve body 7 belt oil ducts 15, one side is through the opening of O type valve rod 6, enter epitrochoidal chamber A16 and open check valve (need not pressure oil) in the A2 chamber Load Control Valve 8, rod chamber 19 to working hole A2 to dump ram.Promote the dump ram hypsokinesis.This moment, the oil of oil cylinder rodless cavity 18 enters 0 type valve rod, 6 opening gears through working hole B2 to epitrochoidal chamber B12, to back oil road 11 oil sump tanks of valve body 7.

When forklift engine was flame-out, main pump is fuel feeding not.Even chaufeur error operations handle (being O type valve rod 6), owing to there is not pressure oil to enter multiway valve and oil cylinder (being that dump ram rodless cavity 18 no pressure oils enter), just can't transfer energy to dump ram rod chamber 19, therefore, can't open A2 chamber Load Control Valve 8, just fluid is locked in the dump ram rod chamber 19 and (promptly plays tilt lock), pallet fork has not just leaned forward.

Embodiment 2:

On the basis of the foregoing description 1, be provided with B2 Load Control Valve 17 at the working hole B2 place on epitrochoidal chamber B12 top, see Fig. 4, other is with embodiment 1.

When the forklift door frame anteversion and retroversion all will have auto-lock function (as high mast forklift truck), original design fork truck multiway valve can't be realized (only at one-sided A2 mouth this function being arranged).At this moment multiway valve can solve by at two working holes (A2, B2) Load Control Valve being set respectively.

When O type valve rod 6 is moved to right (realization is leaned forward), compression spring 9, valve body 7 meta oil ducts 14 are shut by O type valve rod 6, the pressure oil that main pump comes out is opened check valve 10 on the valve body through the triangle oil duct 13 of oil-feed valve block 1, the valve block 2 that hoists to valve body 7 triangle oil ducts 13, enter valve body 7 belt oil ducts 15, one side is through the opening of O type valve rod 6, to epitrochoidal chamber B12, open the check valve in the B2 chamber Load Control Valve 17, again through the rodless cavity 18 of working hole B2 to dump ram.Because the effect of load (pressure oil), dump ram rodless cavity 18 pressure oils promote piston, and this moment, the pressure oil of cylinder rod chamber 19 is opened A2 chamber Load Control Valve 8 (needing certain pressure) through working hole A2, enter O type valve rod 6 opening gears, to back oil road 11 oil sump tanks of valve body 7.Make the forklift door frame forward swing.

During door frame hypsokinesis action, pull out O type valve rod 6 (moving to left), operating mode is to above-mentioned similar substantially.

When forklift engine was flame-out, main pump is fuel feeding not.Even chaufeur error operations handle (being O type valve rod 6), owing to there is not pressure oil to enter multiway valve and oil cylinder (be dump ram two chambeies all do not have pressure oil enter), just can't transfer energy to another chamber of dump ram, therefore, can't open A2 Load Control Valve 8 and B2 Load Control Valve 17, just fluid is locked in dump ram (promptly playing tilt lock) in the oil pocket separately, pallet fork just has been failure to actuate.

Claims

1, the fork truck multiway valve that has the externally positioned type tilt lock, comprise oil-feed valve block (1), the valve block that hoists (2), inclination valve block (3) and oil return valve block (4), the valve block (3) that wherein tilts comprises valve body, valve rod, epitrochoidal chamber A and epitrochoidal chamber B, epitrochoidal chamber A top is being communicated with working hole A2, epitrochoidal chamber B top is being communicated with working hole B2, it is characterized in that:

Described valve rod is an O type valve rod, and the working hole A2 place on described epitrochoidal chamber A top is provided with A2 Load Control Valve (8).

2, the fork truck multiway valve with externally positioned type tilt lock according to claim 1 is characterized in that: the working hole B2 place on described epitrochoidal chamber B top is provided with B2 Load Control Valve (17).