CN112499528B - Hydraulic system for lifting oil cylinder of forklift - Google Patents
Hydraulic system for lifting oil cylinder of forklift Download PDFInfo
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- CN112499528B CN112499528B CN202011220227.9A CN202011220227A CN112499528B CN 112499528 B CN112499528 B CN 112499528B CN 202011220227 A CN202011220227 A CN 202011220227A CN 112499528 B CN112499528 B CN 112499528B
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- 239000003921 oil Substances 0.000 claims description 275
- 230000001105 regulatory effect Effects 0.000 claims description 17
- 239000010720 hydraulic oil Substances 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/008—Valve failure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
Abstract
The invention discloses a hydraulic system for a lifting oil cylinder of a forklift, which can ensure the normal operation of the lifting oil cylinder when one of a first electromagnetic valve 4 or a second electromagnetic valve 5 is damaged. Because when the state of the lift cylinder is switched, no matter in a normal state and when the first electromagnetic valve 4 and the second electromagnetic valve 5 are damaged, the first oil path 101 and the second oil path 102 are components with large oil pressure impact, the stability of the first oil path 101 and the second oil path 102 can also be ensured by the arrangement of the hydraulic system, and the safety of the hydraulic system is further ensured. The above-mentioned setting of this application can improve the pressure of the fluid of storage in the energy storage ware to will realize more can realizing energy recuperation's effect, the energy saving than common energy storage ware energy storage.
Description
Technical Field
The invention belongs to the field of forklifts, and particularly relates to a hydraulic system for a lifting oil cylinder of a forklift.
Background
Fork trucks are industrial handling vehicles, and refer to various wheeled handling vehicles that perform handling, stacking, and short-distance transport operations on piece pallet goods. As shown in fig. 1, which is a prior art forklift 100, in which a lift cylinder 8 is used to lift an object to be lifted, the safety and stability of the operation thereof are crucial to the forklift.
As shown in fig. 2 and 3, in the prior art, an oil path for driving a lift cylinder 8 includes an oil tank 1, a filter 2, a hydraulic pump 3, and four two-position two-way solenoid valves, where the four two-position two-way solenoid valves are a first two-position two-way solenoid valve 4, a second two-position two-way solenoid valve 5, a third two-position two-way solenoid valve 6, and a fourth two-position two-way solenoid valve 7, the oil tank 1, the filter 2, and the hydraulic pump 3 are connected in sequence, the hydraulic pump 3 pumps hydraulic oil in the oil tank 1 to the first two-position two-way solenoid valve 4 and the second two-position two-way solenoid valve 5 through the filter 2, oil outlets of the first two-position two-way solenoid valve 4 and the second two-position two-way solenoid valve 5 are respectively connected to the third two-position two-way solenoid valve 6 and the fourth two-position two-way solenoid valve 7, oil outlets of the third two-position two-way solenoid valve 6 and the fourth two-position two-way solenoid valve 7 discharge the oil into the oil tank 1 through a check valve,
an oil path connected with a rodless cavity of the lifting oil cylinder 8 is arranged on an oil path connecting an oil outlet of the first two-position two-way electromagnetic valve 4 and an oil inlet of the third two-position two-way electromagnetic valve 6, and an oil path connected with a rod cavity of the lifting oil cylinder 8 is arranged on an oil path connecting an oil outlet of the second two-position two-way electromagnetic valve 5 and an oil inlet of the fourth two-position two-way electromagnetic valve 7.
Meanwhile, fig. 2 shows the state that all the solenoid valves in the system are operated when the lift cylinder 8 is lifted, and the flow direction of the hydraulic oil, and the arrows in the figure indicate the flow direction of the oil. Fig. 3 shows the state of all the solenoid valves in the system working when the lift cylinder 8 is lowered, and the flow direction of the hydraulic oil. However, in a real working environment, the first two-position two-way solenoid valve 4 and the second two-position two-way solenoid valve 5 may be damaged and may not work.
Disclosure of Invention
In view of the above technical problems, the present invention provides a hydraulic system for a lift cylinder of a forklift, which aims to solve the problems in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a hydraulic system for a lift cylinder of a forklift, the forklift 100 comprising a body, a mast, a lift cylinder 8, a fork carriage and a fork, the lift cylinder 8 having a hydraulic system providing hydraulic drive thereto.
A hydraulic system for a lifting oil cylinder of a forklift, wherein the lifting oil cylinder 8 is used for driving a pallet fork to move up and down, the hydraulic system comprises an oil tank 1, a filter 2, a hydraulic pump 3, a first electromagnetic valve 4, a second electromagnetic valve 5, a third electromagnetic valve 6, a fourth electromagnetic valve 7, a lifting oil cylinder 8, a fifth electromagnetic valve 9 and a controller, an oil outlet of the hydraulic pump 3 is respectively connected with oil inlets of the first electromagnetic valve 4 and the second electromagnetic valve 5, the hydraulic pump 3 pumps hydraulic oil in the oil tank 1 to the first electromagnetic valve 4 and the second electromagnetic valve 5 through the filter 2, the first electromagnetic valve 4 is connected with an oil inlet of the third electromagnetic valve 6 through a first oil path 101, the second electromagnetic valve 5 is connected with an oil inlet of the fourth electromagnetic valve 7 through a second oil path 102, and oil outlets of the third electromagnetic valve 6 and the fourth electromagnetic valve 7 are connected with an oil inlet of the fifth electromagnetic valve 9, an oil outlet of the fifth electromagnetic valve 9 is connected with the oil tank 1, a cartridge valve II 14 and a seventh electromagnetic valve 15 are sequentially connected between the first oil path 101 and a rod cavity of the lifting oil cylinder 8, a three-position four-way electromagnetic valve II 13 is connected between the first oil path 101 and a rodless cavity of the lifting oil cylinder 8, a three-position four-way electromagnetic valve I10 is connected between the second oil path 102 and the rod cavity of the lifting oil cylinder 8, a cartridge valve I11 and a sixth electromagnetic valve 12 are sequentially connected between the second oil path 102 and the rodless cavity 1 of the lifting oil cylinder 8, an oil port I A1 of the three-position four-way electromagnetic valve II 13 is connected with the first oil path 101, an oil port II B1 is connected with a rodless cavity 8.2 of the lifting oil cylinder 8, an oil port III C1 is connected with the oil tank 1, a cartridge valve II third cavity 14.3 of the cartridge valve II 14 is connected with the first oil path 101, and a first cavity 14.1 of the cartridge valve II is connected with a port of the seventh electromagnetic valve 15, the other port of the seventh electromagnetic valve 15 is connected with a rod cavity 8.1 of the lifting oil cylinder 8, and a second cartridge valve cavity 14.2 is connected with a rodless cavity 8.2 of the lifting oil cylinder 8; the first oil port A2 of the first three-position four-way electromagnetic valve 10 is connected with the second oil way 102, the second oil port B2 is connected with a rod cavity 8.1 of the lifting oil cylinder 8, the third oil port C2 is connected with the oil tank 1, the first third cavity 11.3 of the cartridge valve 11 is connected with the second oil way 102, the first cavity 11.1 of the cartridge valve is connected with one port of the sixth electromagnetic valve 12, the other port of the sixth electromagnetic valve 12 is connected with a rodless cavity 8.2 of the lifting oil cylinder 8, and the first second cavity 11.2 of the cartridge valve is connected with the rod cavity 8.1 of the lifting oil cylinder 8; the controller is used for controlling the hydraulic pump 3, the first electromagnetic valve 4, the second electromagnetic valve 5, the third electromagnetic valve 6, the fourth electromagnetic valve 7, the fifth electromagnetic valve 9, the sixth electromagnetic valve 12, the seventh electromagnetic valve 15, the three-position four-way electromagnetic valve I10 and the three-position four-way electromagnetic valve II 13, and the first electromagnetic valve 4, the second electromagnetic valve 5, the third electromagnetic valve 6, the fourth electromagnetic valve 7, the fifth electromagnetic valve 9, the sixth electromagnetic valve 12 and the seventh electromagnetic valve 15 are all two-position two-way electromagnetic valves.
Further, the oil port three C1 and the oil port three C2 are connected to the first oil port A3 of the flow regulating valve 16, the oil port three C1 and the oil port three C2 are further connected to one port of the three-position two-way solenoid valve 17, the other port of the three-position two-way solenoid valve 17 is connected to the second energy accumulator 26, the oil port two B3 of the flow regulating valve 16 is connected to the oil tank 1, the oil port three C3 is connected to the first overflow valve 18 and the oil port one a4 of the two-position four-way solenoid valve 19, the first overflow valve 18 is connected to the oil tank 1, the oil port two B4 of the two-position four-way solenoid valve 19 is connected to the first cavity 20.1 of the supercharger 20, the oil port three C4 of the two-position two-way solenoid valve 19 is connected to the oil tank 1, the overflow valve four D4 of the two-position two-way solenoid valve 19 is connected to the third cavity 20.3 of the supercharger 20, the second cavity 20.2 of the supercharger 20 is connected to the first check valve 23 and the second check valve 24 respectively, the second overflow valve 22 is connected with the oil tank 1, the second check valve 24 is connected with the oil tank 1, one port of the first accumulator 21 and one port of the eighth electromagnetic valve 25 are connected to an oil path between the first check valve 23 and the second overflow valve 22, and the other port of the eighth electromagnetic valve 25 is connected with the second accumulator 26 through the third check valve 27.
Further, the flow control valve 16 is a two-position three-way electromagnetic valve, the flow control valve 16 has a stop position 16A and an oil discharge position 16B, an oil path one D3 is arranged between an oil port one a3 and an oil port two B3 in the oil discharge position 16B, a throttle valve is arranged on the oil path one D3, an oil path two E3 is separated from the oil path one D3, an adjustable throttle valve is arranged on the oil path two E3, and the oil path two E3 is connected with an oil port three C3.
Further, the three-position two-way electromagnetic valve 17 has a first position 17A, a second position 17B and a third position 17C, and a check valve is arranged on an oil path in the first position 17A and the third position 17C.
Further, the controller controls all of the valves and boosters, etc. described above to function as hydraulic components that can be controlled in this application (those skilled in the art will know which can be controlled).
Compared with the prior art, the invention has the following beneficial effects:
1. because the first solenoid valve 4 and the second solenoid valve 5 are installed near the hydraulic pump 3, compared with other solenoid valves, the first solenoid valve 4 and the second solenoid valve 5 are easily damaged or relatively easily damaged, and the arrangement of the present application can ensure the normal operation of the lift cylinder when one of the first solenoid valve 4 or the second solenoid valve 5 is damaged.
2. Because when the state of the lift cylinder is switched, no matter in a normal state and when the first electromagnetic valve 4 and the second electromagnetic valve 5 are damaged, the first oil path 101 and the second oil path 102 are components with large oil pressure impact, the stability of the first oil path 101 and the second oil path 102 can also be ensured by the arrangement of the hydraulic system, and the safety of the hydraulic system is further ensured.
3. The above-mentioned setting of this application can improve the pressure of the fluid of storage in the energy storage ware to will realize more can realizing energy recuperation's effect, the energy saving than common energy storage ware energy storage.
Drawings
FIG. 1 is a schematic diagram of a prior art forklift;
FIG. 2 illustrates a first prior art operation;
FIG. 3 is a second prior art schematic;
FIG. 4 is a first schematic diagram of a hydraulic circuit of the present invention;
FIG. 5 is a schematic diagram of a second embodiment of the hydraulic circuit of the present invention;
FIG. 6 is a schematic diagram of a third hydraulic circuit of the present invention;
in the figure, an oil tank 1, a filter 2, a hydraulic pump 3, a first electromagnetic valve 4, a first closing position 4A, a first conducting position 4B, a second electromagnetic valve 5, a second closing position 5A, a second conducting position 5B, a third electromagnetic valve 6, a third closing position 6A, a third conducting position 6B, a fourth electromagnetic valve 7, a fourth closing position 7A, a fourth conducting position 7B, a lifting oil cylinder 8, a rod cavity 8.1, a rodless cavity 8.2, a fifth electromagnetic valve 9, a fifth closing position 9A, a fifth conducting position 9B, a three-position four-way electromagnetic valve one 10, a three-position four-way electromagnetic valve one first position 10A, a three-position four-way electromagnetic valve one second position 10B, a three-position four-way electromagnetic valve one third position 10C, a three-position four-way electromagnetic valve one oil port one A2, a three-position four-way electromagnetic valve one B2, a three-position four-way electromagnetic valve one oil port three C2, a cartridge valve one 11, a cartridge valve one first cavity 11.1, a cartridge valve one second cavity 11.2, 11.3 of a first third cavity of the cartridge valve, 12 of a sixth electromagnetic valve, 12A of a sixth closing position, 12B of a sixth conducting position, 13 of a second three-position four-way electromagnetic valve, 13 of a first position 13A of the three-position four-way electromagnetic valve, 13B of a second position 13B of the three-position four-way electromagnetic valve, 13C of a second third position 13C of the three-position four-way electromagnetic valve, 1 of a first oil port of the three-position four-way electromagnetic valve, 1 of a second oil port of the three-position four-way electromagnetic valve, 1 of a second oil port of the three-position four-way electromagnetic valve, 14 of the cartridge valve, 14.1 of the first cavity of the cartridge valve, 14.2 of the second cavity of the cartridge valve, 14.3 of the second cavity of the cartridge valve, 15 of a seventh electromagnetic valve, 15A of a seventh conducting position, 16B of a flow regulating valve (electromagnetic proportional control type pressure compensation flow regulating valve), 16A of a of an oil unloading position 16B, A of the flow regulating valve, A3 of the flow regulating valve, 3 of the flow regulating valve, 3 of a third C of the flow regulating valve, 3 of a first oil port of a first D3 of an oil way, 3 of a second oil way, 3 of an oil way, The hydraulic control system comprises a three-position two-way electromagnetic valve 17, a three-position two-way electromagnetic valve first position 17A, a three-position two-way electromagnetic valve second position 17B, a three-position two-way electromagnetic valve third position 17C, a first overflow valve 18, a two-position four-way electromagnetic valve 19, a two-position four-way electromagnetic valve oil port A4, a two-position four-way electromagnetic valve oil port B4, a two-position four-way electromagnetic valve oil port C4, a two-position four-way electromagnetic valve oil port D4, a supercharger 20, a supercharger first cavity 20.1, a supercharger second cavity 20.2, a supercharger third cavity 20.3, a first energy accumulator 21, a second overflow valve 22, a first check valve 23, a second check valve 24, an eighth electromagnetic valve 25 (an eighth two-position two-way electromagnetic valve 25), an eighth closed position 25A, an eighth conduction position 25B, a second energy accumulator 26, a third check valve 27, a first oil path 101 and a second oil path 102.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1, which is a schematic structural diagram of a forklift 100 in the prior art of the present invention, as can be seen from fig. 1, the forklift 100 has a lifting cylinder 8 for lifting a fork, which is used for loading, moving, and loading and unloading goods, and thus it can be seen that the stability of the fork determines the efficiency and safety of the forklift during operation, and therefore, the stability of the fork is to be improved by improving the stability of the lifting cylinder 8 which determines the stability of the fork, that is, the stability of a hydraulic oil path supplied to the lifting cylinder 8.
As shown in figures 1 and 2, the oil supply system or hydraulic system of the lift cylinder 8 in the prior art of the application is disclosed, the hydraulic system comprises an oil tank 1, a filter 2, a hydraulic pump 3, a first electromagnetic valve 4, a second electromagnetic valve 5, a third electromagnetic valve 6, a fourth electromagnetic valve 7, a lifting oil cylinder 8, a fifth electromagnetic valve 9 and a controller, the oil outlet of the hydraulic pump 3 is respectively connected with the oil inlets of a first electromagnetic valve 4 and a second electromagnetic valve 5, the hydraulic pump 3 pumps the hydraulic oil in the oil tank 1 to a first electromagnetic valve 4 and a second electromagnetic valve 5 through a filter 2 respectively, the first electromagnetic valve 4 is connected with an oil inlet of the third electromagnetic valve 6 through a first oil path 101, the second electromagnetic valve 5 is connected with an oil inlet of the fourth electromagnetic valve 7 through a second oil path 102, oil outlets of the third electromagnetic valve 6 and the fourth electromagnetic valve 7 are connected with the oil tank 1 through one-way valves.
In order to solve the problem that one of the first solenoid valve 4 and the second solenoid valve 5 may be damaged in the operation process in the prior art, the application is improved on the basis of the prior art,
modified embodiment 1
Oil outlets of the third electromagnetic valve 6 and the fourth electromagnetic valve 7 and an oil inlet of a fifth electromagnetic valve 9, the oil outlet of the fifth electromagnetic valve 9 is connected with an oil tank 1, a cartridge valve II 14 and a seventh electromagnetic valve 15 are sequentially connected between the first oil path 101 and a rod cavity of the lifting oil cylinder 8, a three-position four-way electromagnetic valve II 13 is connected between the first oil path 101 and a rodless cavity of the lifting oil cylinder 8, a three-position four-way electromagnetic valve I10 is connected between the second oil path 102 and the rod cavity of the lifting oil cylinder 8, a cartridge valve I11 and a sixth electromagnetic valve 12 are sequentially connected between the second oil path 102 and the rodless cavity 1 of the lifting oil cylinder 8, an oil port A1 of the three-position four-way electromagnetic valve II 13 is connected with the first oil path 101, an oil port B1 is connected with a rodless cavity 8.2 of the lifting oil cylinder 8, a third C1 is connected with the oil tank 1, a second oil port 14.3 of the cartridge valve II 14 is connected with the first oil path 101, a first cavity 14.1 of the cartridge valve II is connected with one port of a seventh electromagnetic valve 15, the other port of the seventh electromagnetic valve 15 is connected with a rod cavity 8.1 of the lifting oil cylinder 8, and a second cavity 14.2 of the cartridge valve II is connected with a rodless cavity 8.2 of the lifting oil cylinder 8; the first oil port A2 of the first three-position four-way electromagnetic valve 10 is connected with the second oil way 102, the second oil port B2 is connected with a rod cavity 8.1 of the lifting oil cylinder 8, the third oil port C2 is connected with the oil tank 1, the first third cavity 11.3 of the cartridge valve 11 is connected with the second oil way 102, the first cavity 11.1 of the cartridge valve is connected with one port of the sixth electromagnetic valve 12, the other port of the sixth electromagnetic valve 12 is connected with a rodless cavity 8.2 of the lifting oil cylinder 8, and the first second cavity 11.2 of the cartridge valve is connected with the rod cavity 8.1 of the lifting oil cylinder 8; the controller is used for controlling the hydraulic pump 3, the first electromagnetic valve 4, the second electromagnetic valve 5, the third electromagnetic valve 6, the fourth electromagnetic valve 7, the fifth electromagnetic valve 9, the sixth electromagnetic valve 12, the seventh electromagnetic valve 15, the three-position four-way electromagnetic valve I10 and the three-position four-way electromagnetic valve II 13, and the first electromagnetic valve 4, the second electromagnetic valve 5, the third electromagnetic valve 6, the fourth electromagnetic valve 7, the fifth electromagnetic valve 9, the sixth electromagnetic valve 12 and the seventh electromagnetic valve 15 are all two-position two-way electromagnetic valves.
The working principle of the embodiment is as follows: if the first electromagnetic valve 4 is damaged, hydraulic oil cannot pass through the first electromagnetic valve 4, the lifting oil cylinder 8 cannot rise, at the moment, the controller controls the second electromagnetic valve 5, the third electromagnetic valve 6, the fourth electromagnetic valve 7 and the sixth electromagnetic valve 12 to be in a conducting state, and controls the first oil port A1 and the second oil port B1 of the second three-position four-way electromagnetic valve 13 to be in a conducting state, the seventh electromagnetic valve 15 and the first three-position four-way electromagnetic valve 10 to be in a disconnecting state, oil pumped by the hydraulic pump 3 sequentially passes through the second electromagnetic valve 5, the fourth electromagnetic valve 7, the third electromagnetic valve 6 and the second three-position four-way electromagnetic valve 13 to enter the rodless cavity 8.2 of the lifting oil cylinder 8, the piston rod is pushed to move upwards, because the first three-position four-way electromagnetic valve 10 is in the disconnecting state, in the upward movement process of the piston rod, the pressure in the first cavity 11.2 of the cartridge valve rises, when the pressure increases to a certain degree, the first cavity 11.1 of the cartridge valve and the second cavity 11.2 of the cartridge valve are conducted, after the controller receives the conducting signal, the controller controls the oil port two B2 and the oil port three C2 of the three-position four-way solenoid valve I10 to be conducted, and oil in the rod cavity 8.1 is discharged into the oil tank 1. When the second solenoid valve 5 is damaged, the control is similar to that described above. The embodiment can ensure that the system can normally operate when the electromagnetic valve 4 or 5 is damaged, and simultaneously can protect the safety and stability of the first oil path 101 and the second oil path 102 when the oil flow direction is switched by arranging the cartridge valve and the control method designed by the invention, and can be used for emergency of a hydraulic system.
Modified embodiment 2
On the basis of the first modified embodiment, in this embodiment, the third port C1 and the third port C2 are connected to the first port A3 of the flow regulating valve 16, the third port C1 and the third port C2 are further connected to one port of the three-position two-way solenoid valve 17, the other port of the three-position two-way solenoid valve 17 is connected to the second accumulator 26, the second port B3 of the flow regulating valve 16 is connected to the oil tank 1, the third port C3 is connected to the first relief valve 18 and the first port a4 of the two-position four-way solenoid valve 19, the first relief valve 18 is connected to the oil tank 1, the second port B4 of the two-position four-way solenoid valve 19 is connected to the first chamber 20.1 of the supercharger 20, the third port C4 of the two-position two-way solenoid valve 19 is connected to the oil tank 1, the fourth port D4 of the two-position two-way solenoid valve 19 is connected to the third chamber 20.3 of the supercharger 20, and the second chamber 20.2 of the supercharger 20 is respectively connected to the first check valve 23 and the second check valve 24, the first check valve 23 is connected with the second overflow valve 22, the second overflow valve 22 is connected with the oil tank 1, the second check valve 24 is connected with the oil tank 1, an oil path between the first check valve 23 and the second overflow valve 22 is connected with one port of a first energy accumulator 21 and one port of an eighth electromagnetic valve 25, and the other port of the eighth electromagnetic valve 25 is connected with a second energy accumulator 26 through a third check valve 27. The flow control valve 16 is a two-position three-way electromagnetic valve, the flow control valve 16 is provided with a stop position 16A and an oil discharge position 16B, an oil path I D3 is arranged between an oil port I A3 and an oil port II B3 in the oil discharge position 16B, a throttle valve is arranged on the oil path I D3, an oil path II E3 is separated from the oil path I D3, an adjustable throttle valve is arranged on the oil path II E3, and the oil path II E3 is connected with the oil port III C3. The three-position two-way electromagnetic valve 17 is provided with a first position 17A, a second position 17B and a third position 17C, and the oil paths in the first position 17A and the third position 17C are provided with one-way valves.
The working principle of the embodiment is as follows: in the embodiment, high-pressure oil in the rod cavity and the rodless cavity is recovered, when the high-pressure oil needs to be recovered, the controller controls the three-position two-way electromagnetic valve 17 to be at the third position 17C, at the moment, the high-pressure oil fills the second energy accumulator 26 through the three-position two-way electromagnetic valve 17, and when the oil pressure in the second energy accumulator 26 is equal to the oil pressure at the third oil port C1 or the third oil port C2, the second energy accumulator cannot automatically fill the hydraulic oil. The controller controls the flow control valve 16 to be at the oil discharge level 16B, and when the control signal of the controller is received again, the flow preferentially flows out from the port one A3 through the port three C3, and when no signal is input, the flow preferentially flows into the oil tank 1 from the port one A3 through the port two B3. When the hydraulic oil flows out through the oil port III C3, the controller controls the two-position four-way electromagnetic valve 19 to switch positions, so that the supercharger 20 is controlled to pump the oil in the oil tank 1 into the second cavity 20.2 through the second check valve 24, the high-pressure oil can be pressed into the first energy accumulator 21 and the second energy accumulator 26 (the oil is charged into the second energy accumulator 26 when the eighth electromagnetic valve 25 is controlled to be opened by the controller), when the oil in the energy accumulator needs to be used, the controller controls the eighth electromagnetic valve 25 to be in a conducting state, and simultaneously controls the three-position two-way electromagnetic valve 17 to be in the first position 17A and the three-position four-way electromagnetic valve I10 to be in the third position 10C or the three-position four-way electromagnetic valve II 13 to be in the third position 13C, and the high-pressure oil in the energy accumulator enters the lifting oil cylinder 8 through the three-position two-way electromagnetic valve 17, the three-position four-way electromagnetic valve I10 or the three-position four-way electromagnetic valve II 13. The embodiment can improve the pressure of the oil stored in the energy accumulator, thereby realizing the effect of energy recovery and saving energy compared with the common energy accumulator.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "disposed," mounted, "" connected, "and" fixed "are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be a mechanical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (3)
1. A hydraulic system for a lifting oil cylinder of a forklift comprises a forklift body, a gantry, the lifting oil cylinder, a fork frame and a fork, wherein the lifting oil cylinder is used for driving the fork to move up and down, the lifting oil cylinder is provided with a hydraulic system for providing hydraulic drive for the lifting oil cylinder, the hydraulic system comprises an oil tank, a filter, a hydraulic pump, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve, the lifting oil cylinder, a fifth electromagnetic valve and a controller, an oil outlet of the hydraulic pump is respectively connected with oil inlets of the first electromagnetic valve and the second electromagnetic valve, the hydraulic pump pumps hydraulic oil in the oil tank to the first electromagnetic valve and the second electromagnetic valve through the filter, the first electromagnetic valve is connected with an oil inlet of the third electromagnetic valve through a first oil path, the second electromagnetic valve is connected with an oil inlet of the fourth electromagnetic valve through a second oil path, oil outlets of the third electromagnetic valve and the fourth electromagnetic valve are connected with an oil inlet of the fifth electromagnetic valve, the oil outlet of the fifth electromagnetic valve is connected with an oil tank, and the oil tank is characterized in that:
a second cartridge valve and a seventh solenoid valve are sequentially connected between the first oil way and the rod cavity of the lifting oil cylinder, a second three-position four-way solenoid valve is connected between the first oil way and the rodless cavity of the lifting oil cylinder, a first three-position four-way solenoid valve is connected between the second oil way and the rod cavity of the lifting oil cylinder, a first cartridge valve is sequentially connected between the second oil way and the rodless cavity of the lifting oil cylinder, a third oil port of the three-position four-way solenoid valve is connected with a first oil circuit, a second oil port of the three-position four-way solenoid valve is connected with a rodless cavity of the lifting oil cylinder, a third oil port of the three-position four-way solenoid valve is connected with an oil tank, a second third cavity of a cartridge valve of the cartridge valve is connected with the first oil circuit, a first cavity of the cartridge valve is connected with one port of a third solenoid valve, the other port of the third solenoid valve is connected with a rod cavity of the lifting oil cylinder, and a second cavity of the cartridge valve is connected with the rodless cavity of the lifting oil cylinder; an oil port I of the three-position four-way solenoid valve I is connected with a second oil way, an oil port II of the three-position four-way solenoid valve I is connected with a rod cavity of the lifting oil cylinder, an oil port III of the three-position four-way solenoid valve I is connected with an oil tank, a third cavity of a cartridge valve I of the cartridge valve I is connected with the second oil way, a first cavity of the cartridge valve I is connected with one port of a sixth solenoid valve, the other port of the sixth solenoid valve is connected with a rodless cavity of the lifting oil cylinder, and a second cavity of the cartridge valve I is connected with the rod cavity of the lifting oil cylinder;
the controller is used for controlling the hydraulic pump, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve, the seventh electromagnetic valve, the first three-position four-way electromagnetic valve and the second three-position four-way electromagnetic valve, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve, the sixth electromagnetic valve and the seventh electromagnetic valve are all two-position two-way electromagnetic valves;
a third oil port of the three-position four-way solenoid valve and a third oil port of the three-position four-way solenoid valve are connected with a first oil port of a flow regulating valve, a third oil port of the three-position four-way solenoid valve and a third oil port of the three-position four-way solenoid valve are also connected with one port of the three-position two-way solenoid valve, the other port of the three-position two-way solenoid valve is connected with a second energy accumulator, the second oil port of the flow regulating valve is connected with an oil tank, the third oil port of the flow regulating valve is connected with a first overflow valve and a first oil port of the two-position four-way solenoid valve, a first overflow valve is connected with the oil tank, the second oil port of the two-position two-way solenoid valve is connected with the oil tank, the fourth oil port of the two-position two-way solenoid valve is connected with a third cavity of a supercharger, a second cavity of the supercharger is respectively connected with a first check valve and a second check valve, the first check valve is connected with the oil tank, and an oil path between the first check valve and the second overflow valve is connected with one port of the first energy accumulator and an eighth solenoid valve, and the other port of the eighth electromagnetic valve is connected with the second accumulator through a third one-way valve.
2. The hydraulic system for a forklift lift cylinder of claim 1, wherein: the flow regulating valve is a two-position three-way electromagnetic valve and is provided with a stop position and an oil discharge position, an oil path I is arranged between the first flow regulating valve oil port and the second flow regulating valve oil port in the oil discharge position, a throttle valve is arranged on the first oil path, an oil path II is branched from the first oil path, an adjustable throttle valve is arranged on the second oil path, and the second oil path is connected with the second flow regulating valve oil port.
3. The hydraulic system for a forklift lift cylinder of claim 2, wherein: the three-position two-way electromagnetic valve is provided with a first position of the three-position two-way electromagnetic valve, a second position of the three-position two-way electromagnetic valve and a third position of the three-position two-way electromagnetic valve, and the oil way in the first position of the third position two-way electromagnetic valve and the third position of the three-position two-way electromagnetic valve is provided with a one-way valve.
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| CN202011220227.9A CN112499528B (en) | 2020-11-05 | 2020-11-05 | Hydraulic system for lifting oil cylinder of forklift |
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| CN202011220227.9A CN112499528B (en) | 2020-11-05 | 2020-11-05 | Hydraulic system for lifting oil cylinder of forklift |
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Effective date of registration: 20231225 Address after: No. 666, Xiangfu Road, Qingshanhu street, Lin'an District, Hangzhou, Zhejiang 311300 Patentee after: HANGZHOU HANGCHA MACHINING Co.,Ltd. Address before: Room 416, No.42, Guangzhou road, Nantong Economic and Technological Development Zone, Jiangsu 226000 Patentee before: Hongcheng electronic industry (Nantong) Co.,Ltd. |