CN202072441U - Multi-way valve for fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions - Google Patents
Multi-way valve for fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions Download PDFInfo
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- CN202072441U CN202072441U CN 201120153227 CN201120153227U CN202072441U CN 202072441 U CN202072441 U CN 202072441U CN 201120153227 CN201120153227 CN 201120153227 CN 201120153227 U CN201120153227 U CN 201120153227U CN 202072441 U CN202072441 U CN 202072441U
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- fork truck
- lifting
- locking
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Abstract
The utility model discloses a multi-way valve for a fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions. The multi-way valve comprises an oil inlet valve plate, an oil return valve plate and a working valve plate. The working valve plate is equipped with a solenoid valve. A check valve, a logic check valve and a manual unloading switch are arranged inside the working valve plate. A governor valve is arranged between a main oil duct and a first oil duct in the working valve plate. The control switch of the solenoid valve is arranged below the seat surface of a fork truck. The manual unloading switch is equipped with a switch rod and the governor valve is equipped with an adjusting rod. The multi-way valve of the utility model is especially suitable for fork trucks. By adopting the multi-way valve, a fork truck is locked when nobody is sitting on the seat of the fork truck. Therefore, the mis-operation of the fork truck is avoided and the operation safety of the fork truck is improved. Meanwhile, safety hazards during the operation of the fork truck are also eliminated.
Description
Technical field
The utility model relates to a kind of multiway valve, especially a kind ofly improves having the lifting self-locking, manually descending and the fork truck multiway valve of decline speed limit function of forklift operator safety.
Background technology
Generally use multiway valve on the domestic existing fork truck, the structure of this multiway valve is: be made of integrated flow divider valve on the oil-feed valve block an oil-feed valve block, oil return valve block and 2～4 work valve blocks.The principle of work of this multiway valve is: when geared oil pump to oil-feed valve block fuel feeding, earlier through flow divider valve, flow divider valve preferentially is transported to the quantitative hydraulic oil of a part diffluence pass on the oil-feed valve block, gives the deflector fuel feeding in the hydraulic efficiency pressure system, satisfies the usefulness of fork-truck steering; When deflector was out-of-run, this part fluid that is used to supply with deflector directly flowed back to fuel tank by deflector.Except this part is used to supply with the fluid of deflector, all the other fluid that geared oil pump is supplied with enter the work valve block, are used for actions such as the hoisting of forklift door frame, inclination, and this kind multiway valve is configured in the basic function demand that can satisfy fork truck in the hydraulic efficiency pressure system of fork truck.Fig. 9 is the hydraulic schematic diagram of the fork truck standard configuration multiway valve of prior art, wherein A1 is the lifting actuator port that is connected with lifting hydraulic cylinder, A2 and the inclination actuator port of B2 for being connected with hydraulic tilt cylinder, T is a return opening, PF is the actuator port to the deflector fuel feeding, and P is the oil inlet of pressure oil.
By as seen shown in Figure 9, control forklift door frame bevelled valve block has hydraulic control one-way valve, the promptly usually said control cock that plays self-locking action, and its effect is when not working, not having fuel feeding to give multiway valve at driving engine, handle the inclination valve rod, original location status is failure to actuate, is remained on to door frame; Even maloperation inclination this moment valve rod can not produce tilting action yet, played the protective effect of door frame inclination safety.But this auto-lock function only limits to door frame to be tilted to control, and can't realize the self-locking of door frame lifting action.If this moment the operate lifting valve rod, lifting hydraulic cylinder drives door frame and goods still can freely descend, and has potential safety hazard.In existing multiway valve, be not provided for locking the electromagnetic self-locking valve of lifting hydraulic cylinder, so can not realize the self-locking that forklift door frame descends.
Even if be provided with special decline electromagnetic self-locking valve, only under the situation of decline electromagnetic self-locking valve energising, the pressure oil in the lifting hydraulic cylinder just can be got back to fuel tank, and door frame could descend.In case during decline electromagnetic self-locking valve fault, the pressure oil in the lifting hydraulic cylinder just can't be got back within the fuel tank, door frame can't descend at this moment, with stuck on control position.Be in when keeping in repair on the control position at door frame, in case the auto-lock function of decline electromagnetic self-locking valve is destroyed in the maintenance process, door frame can plunk down under the effect of deadweight, the staff will probably can damage, make to have potential safety hazard in the maintenance process, be unfavorable for protecting staff's personal safety; If door frame has been uploaded goods, goods also can be damaged in falling process.
In the existing fork truck, be serially connected with a governor valve between lifting hydraulic cylinder and multiway valve, when door frame moved up and down, oil circuit all passed through governor valve, speed limit not when door frame rises, the maximum speed when the control lifting hydraulic cylinder descends.In the uphill process of door frame, because the effect of door frame deadweight and cargo weight need not to adopt the speed limit measure.But in the prior art, pressure oil also passes through governor valve when door frame rises, and when pressure oil process governor valve, has certain loss of pressure.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding, provides a kind of and has the lifting self-locking, manually descends and the fork truck multiway valve of decline speed limit function, and to improve the processing safety of fork truck, the oil pressure loss when reducing forklift door frame and rising.
The utility model be the technical solution problem by the following technical solutions.
Have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, comprise oil-feed valve block, oil return valve block and be used to control the forklift door frame lifting and bevelled work valve block, its constructional feature is that the end face of first end of described work valve block is provided with electromagnetic valve; In first end of described work valve block, between the oil main line of guide oil road and work valve block, be provided with check valve; In described work valve block, with lifting work oil duct and oil main line that lifting actuator port A1 is connected between, be provided with the logic check valve that comes the automatic guidance break-make by described electromagnetic valve, spool one end of logic check valve is provided with the manual off-load switch that is used for manual unlocking logic check valve; In described work valve block, between the oil main line and first oil duct that is connected with back oil road, be provided with and be used to limit the governor valve that flows to the flow of the hydraulic oil between first oil duct from oil main line.
The utlity model has the lifting self-locking, manually descend and the fork truck of decline speed limit function also is with the constructional feature of multiway valve:
Described electromagnetic valve adopts normally closed solenoid valve, and the master cock of described electromagnetic valve is located under the seat of fork truck seat.
Described manual off-load switch includes switch lever.
Described governor valve includes and is used to regulate the adjust bar that flows to the flow of the hydraulic oil between first oil duct from oil main line.
Compared with the prior art, the utility model beneficial effect is embodied in:
(1) by electromagnetic valve and logic check valve are set, realize the control of oil return state of the working oil path of lifting hydraulic cylinder, thereby can make that when no staff was sitting on the seat, the descending operation function all was in the lock state, avoid maloperation, improve the processing safety of fork truck.In the electromagnetic valve et out of order, by manual off-load switch opens logic check valve forklift door frame is descended, the phenomenon that forklift door frame descends suddenly when avoiding appearing at trouble-shooting has been eliminated potential safety hazard.
(2) by governor valve is set, can when forklift door frame descends, limit the oil return speed of hydraulic oil, thereby realize the restriction of forklift door frame descending speed, avoid causing safety misadventure because of the too fast decline of forklift door frame.Because governor valve is arranged between oil main line and the back oil road, hydraulic oil was without governor valve when door frame rose, and hydraulic oil is process governor valve in oil return only, thereby had reduced the hydraulic fluid pressure loss when door frame rises.
Multiway valve of the present utility model is particularly useful for fork truck, have can make fork truck on the seat nobody time locking fork truck, the processing safety of avoiding maloperation occurring, can improve fork truck, eliminate advantage such as forklift operator process safe hidden danger.
Description of drawings
Fig. 1 is the front view of multiway valve of the present utility model.
Fig. 2 is the left view of multiway valve of the present utility model.
Fig. 3 is the hydraulic schematic diagram of multiway valve of the present utility model.
Fig. 4 is the cutaway view of the oil return valve block of multiway valve of the present utility model.
A-A cutaway view among Fig. 1 when Fig. 5 is in propradation for forklift door frame.
A-A cutaway view among Fig. 1 when Fig. 6 remains static for forklift door frame.
A-A cutaway view among Fig. 1 when Fig. 7 is in the decline state for forklift door frame.
A-A cutaway view among Fig. 1 when Fig. 8 descends for make forklift door frame by manual off-load switch.
Fig. 9 is the hydraulic schematic diagram of the multiway valve of prior art.
Label in accompanying drawing 1～accompanying drawing 9: 1 oil-feed valve block, 2 oil return valve blocks, 21 oil return valve block high-pressure oil ducts, 22 oil return valve block back oil roads, 3 work valve blocks, 31 electromagnetic valves, 32 logic check valves, 321 spools, 33 check valves, 34 oil mains line, 35 guide's oil ducts, 36 lifting work oil ducts, 37 back oil roads, 38 first oil ducts, 39 high-pressure oil ducts, 4 unloader valves, 5 manual off-load switches, 51 switch levers, 6 governor valves, 61 adjusts bar, 7 lifting valve rods.
Below pass through the specific embodiment, and the utility model is described in further detail in conjunction with the accompanying drawings.
The specific embodiment
Referring to accompanying drawing 1～accompanying drawing 8, have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, comprise oil-feed valve block 1, oil return valve block 2 and be used to control the forklift door frame lifting and bevelled work valve block 3.The end face of first end of described work valve block 3 is provided with electromagnetic valve 31; In first end of described work valve block 3, between the oil main line 34 of guide oil road 35 and work valve block 3, be provided with check valve 33; In described work valve block 3, between the lifting work oil duct 36 and oil main line 34 that are connected with lifting actuator port A1, be provided with the logic check valve 32 that comes the automatic guidance break-make by described electromagnetic valve 31, spool 321 1 ends of logic check valve 32 are provided with the manual off-load switch 5 that is used for manual unlocking logic check valve 32; By electromagnetic valve 31 and logic check valve 32 are set, realize the control of oil return state of the working oil path of lifting hydraulic cylinder, thereby can make that when no staff was sitting on the seat, the descending operation function all was in the lock state, avoid maloperation, improve the processing safety of fork truck.In electromagnetic valve 31 et out of orders, to open logic check valve 32 by manual off-load switch 5 forklift door frame is descended, the phenomenon that forklift door frame descends suddenly when avoiding appearing at trouble-shooting has been eliminated potential safety hazard.In described work valve block 3, between the oil main line 34 and first oil duct 38 that is connected with back oil road 37, be provided with and be used to limit the governor valve 6 that flows to the flow of the hydraulic oil between first oil duct 38 from oil main line 34.By governor valve 6 is set, can limit the oil return speed of hydraulic oil, thereby realize the restriction of forklift door frame descending speed, avoid causing safety misadventure because of the too fast decline of forklift door frame.
Described electromagnetic valve 31 adopts normally closed solenoid valve, and the master cock of described electromagnetic valve 31 is located under the seat of fork truck seat.When forklift door frame is in the decline state, if do not have the staff on the seat, electromagnetic valve 31 can be in off-position so, correspondingly, logic check valve 32 is in closed condition, disconnects mutually between the lifting work oil duct 36 of lifting actuator port A1 and the oil main line 34, and the hydraulic oil in the lifting work oil duct 36 can oil return, this moment, forklift door frame can not descend when operating the lifting valve rod.If on the seat staff is arranged, then the switch of electromagnetic valve 31 is opened, electromagnetic valve 31 energisings, guide oil 35 flows to back oil road 37 by oil main line 34 from the guide oil road, this moment is owing to exist oil pressure in the lifting work oil duct 36 of lifting actuator port A1, logic check valve 32 is opened, hydraulic oil in the lifting hydraulic cylinder flows to back oil road 37 by lifting work oil duct 36, oil main line 34, governor valve 6 and first oil duct 38 of lifting actuator port A1 successively, realize the oil return of the hydraulic oil in the lifting hydraulic cylinder, realize the decline of forklift door frame.Owing to added electromagnetic valve 31 and logic check valve 32, increased the safety guard-safeguard means one to fork truck, improved the processing safety of fork truck.
Described manual off-load switch 5 includes switch lever 51.By rotor switch bar 51, make the spool 321 direction precessions of switch lever 51 to logic check valve 32, thereby back down the spool 321 of logic check valve 32, make conducting between the lifting work oil duct 36 of lifting actuator port A1 and the oil main line 34, thereby the hydraulic oil in the lifting hydraulic cylinder can be flowed to back oil road 37 by oil main line 34, realize the decline of forklift door frame.
Described governor valve 6 includes and is used to regulate the adjust bar 61 that flows to the flow of the hydraulic oil between first oil duct 38 from oil main line 34.By this adjust bar 61, but the flow of hand adjustment hydraulic oil, thus can limit the oil return speed of hydraulic oil, thus realize the restriction of forklift door frame descending speed.
Fig. 3 is the hydraulic schematic diagram of multiway valve of the present utility model, wherein A1 is the lifting actuator port that is connected with lifting hydraulic cylinder, A2 and B2 inclination actuator port for being connected with hydraulic tilt cylinder, and T1 and T2 are return opening, PF is the actuator port to the deflector fuel feeding, and P is the oil inlet of pressure oil.
As shown in Figure 4, be provided with unloader valve 4 in the described oil return valve block 2, unloader valve 4 is used to control the on off mode between oil return valve block high-pressure oil duct 21 and the oil return valve block back oil road 22, realize the control of the oil return state of whole oil circuit, thereby can make when no staff is positioned at the operation seat, fork truck all is in the lock state, and avoids maloperation, improves the processing safety of fork truck.
As shown in Figure 5, pull back lifting valve rod 7, high pressure oil flows to oil main line 36 through high-pressure oil duct 39, hydraulic oil in the oil main line 36 will be closed check valve 33, push logic check valve 32 open, arrive the lifting work oil duct 36 that is connected with lifting actuator port A1, give lifting hydraulic cylinder, door frame is risen by lifting actuator port A1 fuel feeding.When door frame rose, hydraulic oil was without governor valve 6, thereby the hydraulic fluid pressure that has reduced when door frame rises loses.
As shown in Figure 6, lifting valve rod 7 is in free state, and it is static that lifting hydraulic cylinder rests on a certain position, promptly usually said multiway valve meta state.It is except the sealing that possesses common lifting valve rod 7, also increased together by the meta sealing of electromagnetic valve 31 as the logic check valve 32 of pilot-actuated valve control, under the cold situation of the electromagnet of electromagnetic valve 31, also lifting hydraulic cylinder is sealed, it is the double seal function, greatly reduce the meta spillage of multiway valve, making the downslide amount of lifting hydraulic cylinder littler, is 1/3rd of normal valve by the actual internal leakage that records multiway valve this moment, shows the preceence of its performance.
As shown in Figure 7,7 commutations of lifting valve rod are at the lowering position of lifting hydraulic cylinder, when the electromagnet of electromagnetic valve 31 is switched on, guide oil flows to oil main line 34 from guide oil road 35 by check valve 33, flow to back oil road 37 then, the logic check valve 32 of electromagnetic valve 31 controls is opened, and the hydraulic oil of lifting hydraulic cylinder passes through lifting work oil duct 36, oil main line 34, governor valve 6, first oil duct 38 successively to back oil road 37, realizes that the door frame of lifting hydraulic cylinder control descends.This shows, during electromagnetic valve 31 no powers, operate lifting valve rod in any case, forklift door frame can not descend, and has remedied this lock function that fork truck multiway valve of the prior art is lacked.During actual the use, the electro-magnet control switch of electromagnetic valve 31 also can be arranged under the forklift operator seat, come the switch of control electromagnetic valve 31 by the seat lifting of seat; Also can respond to chaufeur and whether be sitting on the driver seat by being installed in seat inductor in the driver seat with correct posture, if chaufeur is not sitting on the driver seat with correct posture, just do not give electromagnetic valve 31 energisings, all charge and discharge operations all can be stopped; Have only chaufeur to be sitting on the driver seat with correct posture, the electromagnet of electromagnetic valve 31 just can be switched on, and handles multiway valve again, and fork truck just has cooresponding lifting action.
As shown in Figure 8, when electromagnetic valve 31 breaks down, make the logic control valve to open, lifting hydraulic cylinder can't oil return, and the special case that door frame can not descend can appear in fork truck.Owing to be provided with manual off-load switch 5, Fig. 8 is the constitution diagram of its work.At this moment, electromagnetic valve 31 is in normally off, guide's oil duct 35 impassabitity check valves 33 flow to oil main line 34, guide oil can't be realized oil return, the logic check valve 32 of electromagnetic valve 31 controls can not be opened, the hydraulic oil of lifting hydraulic cylinder can't flow to oil main line 34 from lifting work oil duct 36, and the hydraulic oil of lifting hydraulic cylinder also can't oil return.At this moment, can only open logic check valve 32, make the fork truck lifting hydraulic cylinder oil return of breaking down, forklift door frame is descended by manual off-load switch 5.Manually the mode of operation of off-load switch 5 is: switch lever 51 is revolved inwards, back down the spool 321 of logic check valve 32, make conducting between lifting work oil duct 36 and the oil main line 34, like this hydraulic oil in the lifting hydraulic cylinder just can be successively by lifting work oil duct 36, oil main line 34, governor valve 6, first oil duct 38 to back oil road 37, realize the oil return of lifting hydraulic cylinder, thereby realize that forklift door frame descends, avoid when forklift door frame is in control position, carrying out troubleshooting effort, eliminated potential safety hazard.
In described work valve block 3, be provided with decline governor valve 6, its be arranged at oil main line 34 and first oil duct 38 that is connected with back oil road 37 between.During the lifting hydraulic cylinder oil return, hydraulic oil enters first oil duct 38 through governor valve, enters back oil road 37 again, changes the speed limit flow size of governor valves by the adjust bar 61 of regulating governor valve 6, and the scalable descending speed makes that comformability of the present utility model is stronger.Simultaneously, when door frame rose, hydraulic oil was without governor valve 6, thereby the hydraulic fluid pressure that has reduced when door frame rises loses.Evidence, multiway valve of the present utility model, the loss of pressure when system is risen reduces 0.8MPa than common valve.
Claims (4)
1. have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, comprise oil-feed valve block (1), oil return valve block (2) and be used to control the forklift door frame lifting and bevelled work valve block (3), it is characterized in that,
The end face of first end of described work valve block (3) is provided with electromagnetic valve (31); In first end of described work valve block (3), between the oil main line (34) of guide oil road (35) and work valve block (3), be provided with check valve (33); In described work valve block (3), between the lifting work oil duct (36) and oil main line (34) that are connected with lifting actuator port A1, be provided with the logic check valve (32) that comes the automatic guidance break-make by described electromagnetic valve (31), spool (321) one ends of logic check valve (32) are provided with the manual off-load switch (5) that is used for manual unlocking logic check valve (32);
In described work valve block (3), oil main line (34) and with first oil duct (38) that back oil road (37) is connected between be provided with and be used for restriction flows to the flow of the hydraulic oil between first oil duct (38) from oil main line (34) governor valve (6).
2. according to claim 1ly have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, it is characterized in that, described electromagnetic valve (31) adopts normally closed solenoid valve, and the master cock of described electromagnetic valve (31) is located under the seat of fork truck seat.
3. according to claim 1ly have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, it is characterized in that described manual off-load switch (5) includes switch lever (51).
4. according to claim 1ly have the lifting self-locking, manually descend and the fork truck multiway valve of decline speed limit function, it is characterized in that described governor valve (6) includes and is used for regulating the adjust bar (61) that flows to the flow of the hydraulic oil between first oil duct (38) from oil main line (34).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120153227 CN202072441U (en) | 2011-05-13 | 2011-05-13 | Multi-way valve for fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120153227 CN202072441U (en) | 2011-05-13 | 2011-05-13 | Multi-way valve for fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202072441U true CN202072441U (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120153227 Expired - Fee Related CN202072441U (en) | 2011-05-13 | 2011-05-13 | Multi-way valve for fork truck equipped with elevating self-locking, manual decreasing and descending speed-limiting functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202072441U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943903A (en) * | 2012-12-07 | 2013-02-27 | 合肥长源液压股份有限公司 | Multi-path reversing valve for controlling fork truck portal |
| CN108516505A (en) * | 2018-03-23 | 2018-09-11 | 杭叉集团股份有限公司 | Fork truck work safety control and control method |
-
2011
- 2011-05-13 CN CN 201120153227 patent/CN202072441U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102943903A (en) * | 2012-12-07 | 2013-02-27 | 合肥长源液压股份有限公司 | Multi-path reversing valve for controlling fork truck portal |
| CN108516505A (en) * | 2018-03-23 | 2018-09-11 | 杭叉集团股份有限公司 | Fork truck work safety control and control method |
| CN108516505B (en) * | 2018-03-23 | 2020-06-05 | 杭叉集团股份有限公司 | Forklift work safety control device and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20180513 |