CN219911331U - Electric fork truck driver's cabin upset hydraulic system - Google Patents
Electric fork truck driver's cabin upset hydraulic system Download PDFInfo
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- CN219911331U CN219911331U CN202320687356.1U CN202320687356U CN219911331U CN 219911331 U CN219911331 U CN 219911331U CN 202320687356 U CN202320687356 U CN 202320687356U CN 219911331 U CN219911331 U CN 219911331U
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- 239000003921 oil Substances 0.000 description 134
- 239000010720 hydraulic oil Substances 0.000 description 18
- 238000001914 filtration Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- Forklifts And Lifting Vehicles (AREA)
Abstract
The utility model provides an electric forklift cab overturning hydraulic system which comprises an oil tank, a manual pump, an electric pump, a three-position four-way reversing valve, a throttle valve, a double-hydraulic control one-way valve I, a double-hydraulic control one-way valve II and an oil cylinder manual pump, wherein the oil tank is connected with the electric pump; the oil inlet of the electric pump is respectively communicated with the oil tank, and the oil outlet is respectively communicated with the port B of the three-position four-way reversing valve; the port B of the double-hydraulic control one-way valve I and the control port K of the double-hydraulic control one-way valve II are communicated with the port A of the three-position four-way reversing valve; the port B of the double-hydraulic control one-way valve II and the control port K of the double-hydraulic control one-way valve I are communicated with an oil outlet of the throttle valve, an oil inlet of the throttle valve is communicated with a port P of the three-position four-way reversing valve, and a port T is communicated with the oil tank; the port A of the double-hydraulic control one-way valve I is communicated with a rod cavity of the oil cylinder, and the port A of the double-hydraulic control one-way valve II is communicated with a rodless cavity of the oil cylinder; the manual control mode and the electric control mode of cab overturning are realized, the fixation of cab overturning angles is kept through the self-locking function of the system, and the safety is improved.
Description
Technical Field
The utility model relates to the technical field of electric forklift hydraulic systems, in particular to an electric forklift cab overturning hydraulic system.
Background
Currently, the cab of an electric forklift is usually provided in a reversible form. When the electric forklift needs to be overhauled, the cab needs to be overturned and jacked through the oil cylinder, and the oil pump of the driving oil cylinder supplies power through the battery of the electric forklift. When the circuit system of the electric forklift breaks down, the operation of the oil pump cannot be driven, so that the cab cannot be overturned, and the maintenance work is affected.
Publication number CN106741225a discloses an intelligent cab turning system, which comprises an electric pump, a manual pump, a hydraulic cylinder, an oil tank, a hydraulic lock and a limiting device, wherein an oil inlet of the electric pump is connected with the oil tank, an oil outlet of the electric pump is connected with the manual pump, an oil outlet of the manual pump is respectively connected to a rodless cavity of the hydraulic cylinder and the hydraulic lock, a rod cavity of the hydraulic cylinder is connected with an oil return pipe, and the oil return pipe is connected to the oil tank; the manual pump, the electric pump, the hydraulic lock and the oil tank are arranged on the frame, a rod cavity of the hydraulic oil cylinder is hinged with the cab, a rodless cavity of the hydraulic oil cylinder is hinged with the frame, the manual pump and the electric pump drive hydraulic oil to enable a telescopic rod of the hydraulic oil cylinder to extend, the cab is driven to overturn, and after the limit lug bumps against the stop block, the cab stops overturning. After the electric pump and the manual pump stop working, the system cannot realize self-locking, the piston rod of the hydraulic cylinder cannot be kept constant after extending, and certain pressure relief potential safety hazards exist.
Disclosure of Invention
Aiming at the technical defects, the utility model aims to provide an electric forklift cab overturning hydraulic system which realizes two control modes of manual and electric cab overturning, and keeps the fixation of cab overturning angles and improves safety through the self-locking function of the system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the overturning hydraulic system of the cab of the electric forklift comprises an oil tank, a manual pump, an electric pump, a three-position four-way reversing valve, a throttle valve, a double-hydraulic control one-way valve I, a double-hydraulic control one-way valve II and an oil cylinder; the three-position four-way reversing valve is provided with an A port, a B port, a P port and a T port; the oil inlets of the manual pump and the electric pump are respectively communicated with the oil tank, and the oil outlets of the manual pump and the electric pump are respectively communicated with the port B of the three-position four-way reversing valve; the double-hydraulic control one-way valve I is provided with an A port, a B port and a control port K; the double-hydraulic control one-way valve II is provided with an A port, a B port and a control port K; the port B of the double-hydraulic control one-way valve I and the control port K of the double-hydraulic control one-way valve II are respectively communicated with the port A of the three-position four-way reversing valve; the port B of the double-hydraulic control one-way valve II and the control port K of the double-hydraulic control one-way valve I are respectively communicated with an oil outlet of the throttle valve, an oil inlet of the throttle valve is communicated with a port P of the three-position four-way reversing valve, and a port T of the three-position four-way reversing valve is communicated with the oil tank; the port A of the double-hydraulic control one-way valve I is communicated with a rod cavity of the oil cylinder, and the port A of the double-hydraulic control one-way valve II is communicated with a rodless cavity of the oil cylinder.
Preferably, the filter further comprises an oil filter I, an oil filter II, an oil filter III, an oil filter IV and an oil filter V; the oil filter I is connected to a pipeline between the manual pump and the oil tank; the oil filter II is connected to a pipeline between the electric pump and the oil tank; the oil filter III is connected to a pipeline between an A port of the three-position four-way reversing valve and a B port of the double-hydraulic control one-way valve I; the oil filter IV is connected to a pipeline between the port B of the double-hydraulic control one-way valve II and the oil outlet of the throttle valve; the oil filter V is connected to a pipeline between an oil inlet of the throttle valve and a P port of the three-position four-way reversing valve.
Preferably, the valve further comprises a check valve I, a check valve II, a check valve III and a check valve IV; the oil inlet of the one-way valve I is communicated with the oil outlet of the oil filter I, and the oil outlet is communicated with the oil inlet of the manual pump; the oil inlet of the one-way valve II is communicated with the oil outlet of the oil filter II, and the oil outlet is communicated with the oil inlet of the electric pump; the oil inlet of the one-way valve III is communicated with the oil outlet of the manual pump, and the oil outlet is communicated with the port B of the three-position four-way reversing valve; the oil inlet of the one-way valve IV is communicated with the oil outlet of the electric pump, and the oil outlet is communicated with the port B of the three-position four-way reversing valve.
Preferably, the device further comprises an overflow valve; the oil outlet of the manual pump and the oil outlet of the electric pump are respectively communicated with the oil inlet of the overflow valve, and the oil outlet of the overflow valve is communicated with the oil tank.
Preferably, the three-position four-way reversing valve further comprises a hydraulic lock, and an oil inlet of the hydraulic lock is communicated with a P port of the three-position four-way reversing valve.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the utility model, the system is supplied with oil by two oil supply modes of the manual pump and the electric pump, so that the electric overturning of the cab and the manual overturning after the whole vehicle is powered off can be realized, and the system is suitable for maintenance operation under various vehicle conditions.
2. According to the utility model, the double-hydraulic control one-way valve I and the double-hydraulic control one-way valve II are matched with the oil cylinder to realize self-locking of the hydraulic system, so that the stability of the extension state of the piston rod of the oil cylinder is ensured, and the safety of the overturning operation of the cab is improved.
Drawings
Fig. 1 is a hydraulic schematic of the present utility model.
Wherein:
1. oil filtering III; 2. a double-hydraulic control one-way valve I; 3. an oil cylinder; 4. a double-hydraulic control one-way valve II; 5. oil filtering IV; 6. a throttle valve; 7. oil filtering V; 8. a hydraulic lock; 9. a three-position four-way reversing valve; 10. a one-way valve IV; 11. an electric pump; 12. a one-way valve II; 13. oil filtering II; 14. an oil tank; 15. oil filtering I; 16. a one-way valve I; 17. an overflow valve; 18. a manual pump; 19. a one-way valve III.
Description of the embodiments
The utility model is further described below with reference to the accompanying drawings.
As shown in FIG. 1, the overturning hydraulic system of the cab of the electric forklift comprises an oil tank 14, a manual pump 18, an electric pump 11, a three-position four-way reversing valve 9, a throttle valve 6, a double-hydraulic control one-way valve I2, a double-hydraulic control one-way valve II 4 and an oil cylinder 3; the bottom of the oil cylinder 3 is connected to the frame of the electric forklift, the top of the piston rod is connected to the bottom of the cab, and the cab is driven to turn over by the expansion and contraction of the piston rod of the oil cylinder 3; the three-position four-way reversing valve 9 is provided with an A port, a B port, a P port and a T port; the oil inlets of the manual pump 18 and the electric pump 11 are respectively communicated with the oil tank 14, and the oil outlets of the manual pump 18 and the electric pump 11 are respectively communicated with the port B of the three-position four-way reversing valve 9; the double-hydraulic control one-way valve I2 is provided with an A port, a B port and a control port K; the double-hydraulic control one-way valve II 4 is provided with an A port, a B port and a control port K; the port B of the double-hydraulic control one-way valve I2 and the control port K of the double-hydraulic control one-way valve II 4 are respectively communicated with the port A of the three-position four-way reversing valve 9; the port B of the double-hydraulic control one-way valve II 4 and the control port K of the double-hydraulic control one-way valve I2 are respectively communicated with an oil outlet of the throttle valve 6, an oil inlet of the throttle valve 6 is communicated with a port P of the three-position four-way reversing valve 9, and a port T of the three-position four-way reversing valve 9 is communicated with the oil tank 14; the port A of the double-hydraulic control one-way valve I2 is communicated with a rod cavity of the oil cylinder 3, and the port A of the double-hydraulic control one-way valve II 4 is communicated with a rodless cavity of the oil cylinder 3; the manual pump 18 or the electric pump 11 sucks hydraulic oil from the oil tank 14 and enters the oil cylinder 3 through the three-position four-way reversing valve 9, the double-hydraulic control one-way valve I2 or the double-hydraulic control one-way valve II 4 to drive a piston rod of the oil cylinder 3 to perform telescopic movement; when the manual pump 18 and the electric pump 11 perform the customizing action, the double-hydraulic control one-way valve I2 and the double-hydraulic control one-way valve II 4 can realize self-locking, and the internal pressure of the oil cylinder 3 is kept, so that the position of a piston rod of the oil cylinder is fixed; the throttle valve 6 can adjust the flow of hydraulic oil, and then control the speed of the expansion and contraction of the piston rod of the oil cylinder 3.
Further, the filter further comprises an oil filter I15, an oil filter II 13, an oil filter III 1, an oil filter IV 5 and an oil filter V7; the oil filter I15 is connected to a pipeline between the manual pump 18 and the oil tank 14; the oil filter II 13 is connected to a pipeline between the electric pump 11 and the oil tank 14; the oil filter III 1 is connected to a pipeline between an A port of the three-position four-way reversing valve 9 and a B port of the double-hydraulic control one-way valve I2; the oil filter IV 5 is connected to a pipeline between the port B of the double-hydraulic control one-way valve II 4 and the oil outlet of the throttle valve 6; the oil filter V7 is connected to a pipeline between an oil inlet of the throttle valve 6 and a P port of the three-position four-way reversing valve 9 and is used for filtering hydraulic oil.
Further, the valve further comprises a check valve I16, a check valve II 12, a check valve III 19 and a check valve IV 10; the oil inlet of the one-way valve I16 is communicated with the oil outlet of the oil filter I15, and the oil outlet is communicated with the oil inlet of the manual pump 18; the oil inlet of the one-way valve II 12 is communicated with the oil outlet of the oil filter II 13, and the oil outlet is communicated with the oil inlet of the electric pump 11; the oil inlet of the one-way valve III 19 is communicated with the oil outlet of the manual pump 18, and the oil outlet is communicated with the port B of the three-position four-way reversing valve 9; the oil inlet of the one-way valve IV 10 is communicated with the oil outlet of the electric pump 11, and the oil outlet is communicated with the port B of the three-position four-way reversing valve 9, so that hydraulic oil is prevented from flowing back.
Further, the device also comprises an overflow valve 17; the oil outlet of the manual pump 18 and the oil outlet of the electric pump 11 are respectively communicated with the oil inlet of the overflow valve 17, and the oil outlet of the overflow valve 17 is communicated with the oil tank 14, so that the oil pressure is ensured to be in a safe range.
Further, the hydraulic lock 8 is further included, and an oil inlet of the hydraulic lock 8 is communicated with a P port of the three-position four-way reversing valve 9 and is used for being matched with a lock catch at the bottom of the cab to fix the cab.
Working principle:
when the operator cab needs to be turned over during maintenance of the electric forklift, the electric pump 11 is started to convey hydraulic oil according to the use requirement or the manual pump 18 is adopted to convey hydraulic oil after the whole forklift is powered off; when the port B and the port P of the three-position four-way reversing valve 9 are communicated, hydraulic oil is output from the port B of the three-position four-way reversing valve 9, the hydraulic oil enters the hydraulic lock 8, the hydraulic lock 8 is opened, a lock catch at the bottom of a cab breaks away from the control of the hydraulic lock 8, the hydraulic oil enters the port B of the double-hydraulic control one-way valve II 4 to jack the valve core so that oil enters the rodless cavity of the oil cylinder 3, meanwhile, the hydraulic oil enters the control port K of the double-hydraulic control one-way valve I2 to jack the valve core of the double-hydraulic control one-way valve I2 so that the port A and the port B of the double-hydraulic control one-way valve I2 are communicated, the hydraulic oil in a rod cavity in the oil cylinder 3 flows back to the port A of the three-position four-way reversing valve 9 through the double-hydraulic control one-way valve I2 and then flows back to the oil tank 14 through the port T, and the extending action of a piston rod of the oil cylinder 3 is realized. When the port A and the port B of the three-position four-way reversing valve 9 are communicated, hydraulic oil flows from the port A of the three-position four-way reversing valve 9 to the port B of the double-hydraulic control one-way valve I2 to jack up the valve core, hydraulic oil enters the rod cavity of the oil cylinder 3 from the port A of the double-hydraulic control one-way valve I2, meanwhile, the valve core of the double-hydraulic control one-way valve II 4 is jack up from the control port K of the double-hydraulic control one-way valve II 4, and hydraulic oil in the rodless cavity of the oil cylinder 3 flows to the port P of the three-position four-way reversing valve 9 through the port B of the double-hydraulic control one-way valve II 4 and then flows back to the oil tank 14 through the port T. When the electric pump 11 and the manual pump 18 stop working, the valve cores of the double-hydraulic control one-way valve I2 and the double-hydraulic control one-way valve II 4 are reset, self-locking is realized, and the extension length of the piston rod of the oil cylinder 3 is kept unchanged.
Claims (5)
1. The overturning hydraulic system for the cab of the electric forklift is characterized by comprising an oil tank (14), a manual pump (18), an electric pump (11), a three-position four-way reversing valve (9), a throttle valve (6), a double-hydraulic control one-way valve I (2), a double-hydraulic control one-way valve II (4) and an oil cylinder (3); the three-position four-way reversing valve (9) is provided with an A port, a B port, a P port and a T port; the oil inlets of the manual pump (18) and the electric pump (11) are respectively communicated with the oil tank (14), and the oil outlets are respectively communicated with the port B of the three-position four-way reversing valve (9); the double-hydraulic control one-way valve I (2) is provided with an A port, a B port and a control port K; the double-hydraulic control one-way valve II (4) is provided with an A port, a B port and a control port K; the control port K of the double-hydraulic control one-way valve I (2) and the control port K of the double-hydraulic control one-way valve II (4) are respectively communicated with the port A of the three-position four-way reversing valve (9); the port B of the double-hydraulic control one-way valve II (4) and the control port K of the double-hydraulic control one-way valve I (2) are respectively communicated with an oil outlet of the throttle valve (6), an oil inlet of the throttle valve (6) is communicated with a port P of the three-position four-way reversing valve (9), and a port T of the three-position four-way reversing valve (9) is communicated with the oil tank (14); the port A of the double-hydraulic control one-way valve I (2) is communicated with a rod cavity of the oil cylinder (3), and the port A of the double-hydraulic control one-way valve II (4) is communicated with a rodless cavity of the oil cylinder (3).
2. The electric forklift cab tilting hydraulic system according to claim 1, further comprising an oil filter i (15), an oil filter ii (13), an oil filter iii (1), an oil filter iv (5), an oil filter v (7); the oil filter I (15) is connected to a pipeline between the manual pump (18) and the oil tank (14); the oil filter II (13) is connected to a pipeline between the electric pump (11) and the oil tank (14); the oil filter III (1) is connected to a pipeline between an A port of the three-position four-way reversing valve (9) and a B port of the double-hydraulic control one-way valve I (2); the oil filter IV (5) is connected to a pipeline between the port B of the double-hydraulic control one-way valve II (4) and the oil outlet of the throttle valve (6); the oil filter V (7) is connected to a pipeline between an oil inlet of the throttle valve (6) and a P port of the three-position four-way reversing valve (9).
3. The electric forklift cab tilting hydraulic system according to claim 2, further comprising a check valve i (16), a check valve ii (12), a check valve iii (19), and a check valve iv (10); an oil inlet of the one-way valve I (16) is communicated with an oil outlet of the oil filter I (15), and the oil outlet is communicated with an oil inlet of the manual pump (18); an oil inlet of the one-way valve II (12) is communicated with an oil outlet of the oil filter II (13), and the oil outlet is communicated with an oil inlet of the electric pump (11); an oil inlet of the one-way valve III (19) is communicated with an oil outlet of the manual pump (18), and the oil outlet is communicated with a port B of the three-position four-way reversing valve (9); an oil inlet of the one-way valve IV (10) is communicated with an oil outlet of the electric pump (11), and the oil outlet is communicated with a port B of the three-position four-way reversing valve (9).
4. An electric fork lift cab tilting hydraulic system according to claim 3, further comprising an overflow valve (17); the oil outlet of the manual pump (18) and the oil outlet of the electric pump (11) are respectively communicated with the oil inlet of the overflow valve (17), and the oil outlet of the overflow valve (17) is communicated with the oil tank (14).
5. The electric fork truck cab tilting hydraulic system according to any one of claims 2 to 4, further comprising a hydraulic lock (8), wherein an oil inlet of the hydraulic lock (8) communicates with a P port of the three-position four-way reversing valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320687356.1U CN219911331U (en) | 2023-03-31 | 2023-03-31 | Electric fork truck driver's cabin upset hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320687356.1U CN219911331U (en) | 2023-03-31 | 2023-03-31 | Electric fork truck driver's cabin upset hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219911331U true CN219911331U (en) | 2023-10-27 |
Family
ID=88466388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320687356.1U Active CN219911331U (en) | 2023-03-31 | 2023-03-31 | Electric fork truck driver's cabin upset hydraulic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219911331U (en) |
-
2023
- 2023-03-31 CN CN202320687356.1U patent/CN219911331U/en active Active
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