CN112209305A - Hydraulic system of storage forklift - Google Patents
Hydraulic system of storage forklift Download PDFInfo
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- CN112209305A CN112209305A CN202011191208.8A CN202011191208A CN112209305A CN 112209305 A CN112209305 A CN 112209305A CN 202011191208 A CN202011191208 A CN 202011191208A CN 112209305 A CN112209305 A CN 112209305A
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- 239000003921 oil Substances 0.000 claims abstract description 140
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 8
- 230000033001 locomotion Effects 0.000 description 11
- 230000002457 bidirectional effect Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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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
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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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
-
- 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
- F15B20/004—Fluid pressure supply failure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Transportation (AREA)
- Analytical Chemistry (AREA)
- Civil Engineering (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a hydraulic system of a storage forklift in the field of hydraulic systems of forklifts, which comprises a hydraulic oil tank, an oil pump connected with the hydraulic oil tank and a multi-way valve bank connected with the oil pump; the multi-way valve bank comprises a valve body, and a T port of the valve body is communicated with the hydraulic oil tank; the inside of the valve body is provided with a safety valve and a two-position two-way reversing valve, wherein an oil inlet of the safety valve is connected with the P port of the valve body; the oil outlet of the two-position two-way reversing valve is sequentially connected with a throttle valve, a first one-way valve and a T port of the valve body, the oil outlet of the two-position two-way reversing valve is further connected with an inlet of a second one-way valve, an outlet of the second one-way valve is connected with oil inlets of the electro-hydraulic proportional reversing valve and two lifting oil cylinders of a forklift, and the oil outlet of the electro-hydraulic proportional reversing valve is connected with the T port of the valve body. The invention can solve the problems of system pressure build-up and gantry up leaping when the moving stroke of the storage forklift is in place, and the problem that the gantry freely shakes in the track when the forklift is braked suddenly in the process of moving forwards and backwards.
Description
Technical Field
The invention relates to the field of forklift hydraulic systems, in particular to a storage forklift hydraulic system.
Background
The storage forklift is widely used in operation occasions such as warehouse warehouses, supermarkets, factory workshops and the like due to flexibility, good passing performance and good stability. The loading and unloading work of the storage forklift is realized by converting hydraulic energy into mechanical energy through hydraulic transmission, namely, the motion is transmitted to working oil cylinders (a lifting oil cylinder, a front-back moving oil cylinder, an inclined oil cylinder and a side-shifting oil cylinder) through oil liquid so as to achieve the purpose of loading and unloading goods. The door frame of the storage forklift can move forwards along the track on the inner side of the supporting leg, so that goods can be conveniently forked. When the forklift travels, the portal frame retreats to the middle position close to the forklift body along the track on the inner side of the supporting legs, so that the center of gravity of goods is positioned in the supporting surface, and the stability of the forklift during operation is ensured.
When the existing storage forklift is used, when the gantry moves forwards and backwards or inclines or the lateral movement oil cylinder travels in place in an idle state, a hydraulic system is subjected to pressure building, and the problem that the gantry moves upwards is caused.
Disclosure of Invention
The invention aims to provide a hydraulic system of a storage forklift to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a hydraulic system of a storage forklift comprises a hydraulic oil tank, an oil pump connected with the hydraulic oil tank and a multi-way valve bank connected with the oil pump; the multi-way valve bank comprises a valve body, and a T port of the valve body is communicated with the hydraulic oil tank; the inside of the valve body is provided with a safety valve and a two-position two-way reversing valve, wherein an oil inlet of the safety valve is connected with the P port of the valve body; the oil outlet of the two-position two-way reversing valve is sequentially connected with a throttle valve, a first one-way valve and a T port of the valve body, the oil outlet of the two-position two-way reversing valve is further connected with an inlet of a second one-way valve, an outlet of the second one-way valve is connected with oil inlets of the electro-hydraulic proportional reversing valve and two lifting oil cylinders of a forklift, and the oil outlet of the electro-hydraulic proportional reversing valve is connected with the T port of the valve body.
As an improved scheme of the invention, the valve body also comprises at least one three-position four-way reversing valve with two oil inlets respectively connected with the port P and the port T, wherein two oil outlets of one three-position four-way reversing valve are respectively connected with two oil inlets of a two-way balancing valve, and two oil outlets of the two-way balancing valve are respectively communicated with two cavities of a front-back moving oil cylinder of a forklift.
As an improved scheme of the invention, the three-position four-way reversing valve connected with the front-back moving oil cylinder is a Y-shaped function three-position four-way reversing valve.
As an improved scheme of the invention, one oil outlet of one three-position four-way reversing valve is connected with a rod cavity of an inclined oil cylinder of a forklift, the other oil outlet of the three-position four-way reversing valve is connected with an oil inlet of a one-way balance valve, and an oil outlet of the one-way balance valve is connected with a rodless cavity and a rod cavity of the inclined oil cylinder of the forklift.
As an improved scheme of the invention, the three-position four-way reversing valve connected with the inclined oil cylinder is an O-shaped function three-position four-way reversing valve.
As an improved scheme of the invention, two oil outlets of one three-position four-way reversing valve are respectively connected with one cavity of two side shifting oil cylinders of a forklift, and the other cavity of the two side shifting oil cylinders is connected.
As an improved scheme of the invention, the three-position four-way reversing valve connected with the side shifting oil cylinder is an O-shaped function three-position four-way reversing valve.
As an improved scheme of the invention, the oil outlet of the two-position two-way reversing valve is also connected with the inlet of a throttle switch valve, and the outlet of the throttle switch valve is connected with the T port of the valve body.
Has the advantages that: the invention provides a simple, stable and safe hydraulic system, which can solve the problems of pressure build-up and leaping up of a portal of a system when a storage forklift moves in place in a moving stroke, and the problem of free shaking of the portal in a track when sudden braking occurs in a forward and backward moving process.
Drawings
FIG. 1 is a hydraulic system diagram of the present invention.
In the figure: 1-a hydraulic oil tank; 2-an oil pump; 3-a multi-way valve bank; 4-lifting oil cylinder; 5-moving the oil cylinder back and forth; 6-one-way balance valve; 7-tilting the oil cylinder; 8-side shift oil cylinder; 9-a first one-way valve; 10-a throttle valve; 11-a two-position two-way reversing valve; 12-a throttle switch valve; 13-a second one-way valve; 14-an electro-hydraulic proportional directional valve; 15-side shift diverter valve; 16-a tilt reversing valve; 17-a two-way balancing valve; 18-a forward shift diverter valve; 19-a safety valve; 20-a three-way pipe; 21-four-way pipe.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1, see fig. 1, a hydraulic system of a storage forklift includes a hydraulic oil tank 1, an oil pump 2 connected to the hydraulic oil tank 1, and a multi-way valve block 3 connected to the oil pump 2; the multi-way valve group 3 comprises a valve body, wherein a P port, a T port, an H port, an A1 port, a B1 port, an A2 port, a B2 port, an A3 port and a B3 port are arranged on the valve body, the T port of the valve body is an oil return port and is communicated with the hydraulic oil tank 1, and the P port of the valve body is connected to the oil pump 2.
A safety valve 19 with an oil inlet connected with the port P, a two-position two-way reversing valve 11 and at least one three-position four-way reversing valve with two oil inlets connected with the port P and the port T are arranged in the valve body; an oil outlet of the two-position two-way reversing valve 11 is connected with a first connector of the three-way pipe 20, a second connector of the three-way pipe 20 is connected with an inlet of the throttle valve 10, an outlet of the throttle valve 10 is communicated with an inlet of the first one-way valve 9, and an outlet of the first one-way valve 9 is communicated with the T port.
One of the three-position four-way reversing valves is a forward-moving reversing valve 18, the forward-moving reversing valve 18 is a Y-type function three-position four-way reversing valve, two oil outlets of the forward-moving reversing valve 18 are respectively connected with two oil inlets V1 and V2 of a two-way balance valve 17, two oil outlets C1 and C2 of the two-way balance valve 17 are respectively communicated with an A1 port and a B1 port of the valve body, and an A1 port and a B1 port are respectively communicated with two cavities of a forward-and-backward moving oil cylinder 5 of the forklift.
When the gantry needs to move forwards for work, the forward movement reversing valve 18 reverses to the left position, and pressure oil from the oil pump 2 enters a rodless cavity of the forward and backward movement oil cylinder 5 through a P port of the multi-way valve group 3, the forward movement reversing valve 18, a V1 port in the bidirectional balance valve 17, a C1 port in the bidirectional balance valve 17 and an A1 port of the multi-way valve group 3 to push the gantry to move forwards.
When the portal needs to move backwards, the forward-moving reversing valve 18 reverses to the right position, and pressure oil from the oil pump 2 enters a rod cavity of the forward-and-backward moving oil cylinder 5 through a P port of the multi-way valve group 3, the forward-moving reversing valve 18, a V2 port in the bidirectional balance valve 17, a C2 port in the bidirectional balance valve 17 and a B1 port of the multi-way valve group 3 to push the portal to move backwards.
If in the combined operation process of forward and backward movement and running, emergency braking needs to be implemented when a barrier is met, meanwhile, the forward movement operation of the portal frame stops, the motor driving the oil pump stops running, the portal frame tends to have a forward stroke or backward stroke due to inertia, the oil supply flow of the oil pump cannot meet the running speed requirement of the forward and backward movement oil cylinder at the moment, the oil supply pressure of an oil path is reduced, on one hand, the bidirectional balance valve 17 is closed due to the reduction of the oil pressure of the control oil path, the forward and backward movement of the portal frame is limited, on the other hand, due to the fact that the bidirectional balance valve 17 needs to be closed, negative pressure suction is generated by impact of two cavities of the forward and backward movement oil cylinder 5 of the portal frame, the oil supplementing one-way valve built in the bidirectional balance valve 17 is opened, oil is supplemented from an.
The safety valve 19 limits the highest working pressure of the hydraulic system, when the storage forklift moves forwards or inclines or moves in place in a side-shifting stroke, the working pressure of the hydraulic system reaches the pressure set by the safety valve 19, and the pressure oil from the oil pump 2 overflows back to the hydraulic oil tank 1 through the safety valve 19. At the moment, the pressure oil drained from the middle position of the two-position two-way reversing valve 11 flows back to the hydraulic oil tank 1 through the throttle valve 10 and the first one-way valve 9.
Further, an oil outlet of the two-position two-way reversing valve 11 is further connected with an inlet of a second one-way valve 13, an outlet of the second one-way valve 13 is connected with a first connector of a four-way pipe 21, a second connector and a third connector of the four-way pipe 21 are respectively connected with an electro-hydraulic proportional reversing valve 14 and an H port of the valve body, the H port is connected with oil inlets of two lifting oil cylinders 4 of the forklift, and an oil outlet of the electro-hydraulic proportional reversing valve 14 is connected with a T port of the valve body.
When the storage forklift starts lifting work, the two-position two-way reversing valve 11 is reversed to the left position, pressure oil from the oil pump 2 enters the lifting oil cylinder 4 through the P port of the multi-way valve group 3, the second check valve 13 and the H port of the multi-way valve group 3, and lifting action of the gantry is achieved. When the storage forklift forks the goods to descend, the electro-hydraulic proportional directional valve 14 is electrified to be in a reversing position, the second one-way valve 13 is closed reversely, and pressure oil output by the descending of the lifting oil cylinder 11 flows back to the hydraulic oil tank 1 through the H port of the multi-way valve 3 and the proportional directional valve 14.
When the working pressure of the hydraulic system reaches the pressure set by the safety valve 19, the pressure oil drained from the neutral position of the two-position two-way reversing valve 11 flows back to the hydraulic oil tank 1 through the throttle valve 10 and the first one-way valve 9, so that the phenomenon that the pressure oil enters the lifting oil cylinder 4 and the gantry moves upwards due to the fact that the second one-way valve 13 is opened by being suppressed in an unloaded state can be prevented.
When the oil pump 2 is started in a transient state, because the reversing valves are not reversed in place, the pressure oil output by the oil pump 2 rises rapidly at the inlets of the reversing valves, at this time, the hydraulic oil leaked from the middle position of the two-position two-way reversing valve 11 flows back to the oil tank 1 through the throttle valve 10 and the first one-way valve 9, and the phenomenon that the pressure oil enters the lifting oil cylinder 4 to cause the upward movement of the gantry due to the fact that the pressure oil is suppressed and opened is prevented from opening the second one-way valve 13.
Further, a fourth interface of the four-way pipe 21 is also connected with an oil inlet of the throttle switch valve 12, and an oil outlet of the throttle switch valve 12 is connected with the T port of the valve body.
The throttle switch valve 12 is in a closed state when in normal use, and if the whole machine is in a lifting process and breaks down or the gantry is in a lifting stop state in a liftoff state, the throttle switch valve 12 is opened, so that the gantry can be slowly lowered, and the effect of safety guarantee is achieved.
Furthermore, one oil outlet of one three-position four-way reversing valve is communicated with the port A2 of the valve body, the port A2 of the valve body is communicated with a rod cavity of the inclined oil cylinder 7 of the forklift, the other oil outlet of the three-position four-way reversing valve is communicated with the port B2 of the valve body, the port B2 of the valve body is communicated with an oil inlet of the one-way balance valve 6, and the oil outlet of the one-way balance valve 6 is connected with a rodless cavity and a rod cavity of the inclined oil cylinder 7. The three-position four-way reversing valve is an inclined reversing valve 16, and the inclined reversing valve 16 is an O-shaped function three-position four-way reversing valve.
When the portal frame needs to tilt forwards and backwards, the tilting reversing valve 16 reverses to the left position or the right position, and pressure oil from the oil pump 2 enters a rodless cavity or a rod cavity of the tilting oil cylinder 7 through a P port of the multi-way valve group 3, the tilting reversing valve 16 and the one-way balance valve 6, so that the forward and backward tilting action of the portal frame is realized.
Furthermore, two oil outlets of one of the three-position four-way reversing valves are respectively communicated with an A3 port and a B3 port of the valve body, an A3 port and a B3 port are respectively communicated with one cavity of the two side shifting oil cylinders 8, and the other cavity of the two side shifting oil cylinders 8 is connected. The three-position four-way reversing valve is a side shifting reversing valve 15, and the side shifting reversing valve 15 is an O-shaped function three-position four-way reversing valve.
When the fork of the portal needs to move left and right laterally, the lateral shifting reversing valve 15 reverses to the left or right, and pressure oil from the oil pump 2 enters the left cavity and the right cavity of the lateral shifting oil cylinder 8 through the P port of the multi-way valve 3 and the lateral shifting reversing valve 15, so that the lateral shifting action of the fork is realized.
When the storage forklift meets the combined operation requirements of lifting, forward moving, inclining or side moving, pressure oil output by the oil pump 2 is simultaneously supplied to the lifting oil cylinder 4, the back-and-forth moving oil cylinder 5, the inclining oil cylinder 7 and the side moving oil cylinder 8, and the mutual actions are not interfered.
The invention provides a simple, stable and safe hydraulic system, which can solve the problems of pressure build-up and leaping up of a portal of a storage forklift when the moving stroke is in place, and the problem of free shaking of a sudden braking portal in a track in the process of moving forwards and backwards.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
In the description of the present invention, it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
1. A hydraulic system of a storage forklift comprises a hydraulic oil tank (1), an oil pump (2) connected with the hydraulic oil tank (1) and a multi-way valve group (3) connected with the oil pump (2); the multi-way valve bank (3) comprises a valve body, and a T port of the valve body is communicated with the hydraulic oil tank (1); the two-position two-way reversing valve is characterized in that a safety valve (19) and a two-position two-way reversing valve (11) are arranged in the valve body, wherein an oil inlet of the safety valve is connected with a P port of the valve body; the oil outlet of the two-position two-way reversing valve (11) is sequentially connected with a T port of the throttle valve (10), the first one-way valve (9) and the valve body, the oil outlet of the two-position two-way reversing valve (11) is further connected with an inlet of the second one-way valve (13), an outlet of the second one-way valve (13) is connected with oil inlets of the electro-hydraulic proportional reversing valve (14) and two lifting oil cylinders (4) of a forklift, and the oil outlet of the electro-hydraulic proportional reversing valve (14) is connected with the T port of the valve body.
2. The hydraulic system of the storage forklift as claimed in claim 1, wherein the valve body further comprises at least one three-position four-way reversing valve with two oil inlets respectively connected with the port P and the port T, two oil outlets of one three-position four-way reversing valve are respectively connected with two oil inlets of the two-way balancing valve (17), and two oil outlets of the two-way balancing valve (17) are respectively communicated with two cavities of the front-back moving oil cylinder (5) of the forklift.
3. A hydraulic system for a storage forklift as claimed in claim 2, wherein the three-position four-way reversing valve connected to the forward and backward moving cylinder (5) is a Y-type functional three-position four-way reversing valve.
4. The hydraulic system of the storage forklift as recited in claim 2, wherein one oil outlet of one of the three-position four-way reversing valves is connected with a rod cavity of the tilting cylinder (7) of the forklift, the other oil outlet is connected with an oil inlet of the one-way balancing valve (6), and an oil outlet of the one-way balancing valve (6) is connected with a rodless cavity and a rod cavity of the tilting cylinder (7) of the forklift.
5. A hydraulic system for a storage forklift according to claim 4, wherein the three-position four-way reversing valve connected to the tilt cylinder (7) is an O-type functional three-position four-way reversing valve.
6. A hydraulic system for a storage forklift according to claim 4, wherein two oil outlets of one of the three-position four-way reversing valves are respectively connected with one of the chambers of the two side shift cylinders (8) of the forklift, and the other chambers of the two side shift cylinders (8) are connected.
7. A hydraulic system for a storage forklift as claimed in claim 6, wherein the three-position four-way reversing valve connected to the side shift cylinder (8) is an O-type function three-position four-way reversing valve.
8. The hydraulic system of the storage forklift as claimed in claim 1, 2, 4 or 6, wherein the oil outlet of the two-position two-way reversing valve (11) is further connected with the oil inlet of a throttle switch valve (12), and the oil outlet of the throttle switch valve (12) is connected with the T port of the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011191208.8A CN112209305A (en) | 2020-10-30 | 2020-10-30 | Hydraulic system of storage forklift |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011191208.8A CN112209305A (en) | 2020-10-30 | 2020-10-30 | Hydraulic system of storage forklift |
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| CN112209305A true CN112209305A (en) | 2021-01-12 |
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| CN202011191208.8A Pending CN112209305A (en) | 2020-10-30 | 2020-10-30 | Hydraulic system of storage forklift |
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| CN108622826A (en) * | 2018-07-23 | 2018-10-09 | 杭叉集团股份有限公司 | Prevent the reach truck hydraulic system that door frame slides back and forth |
| CN113942963A (en) * | 2021-09-26 | 2022-01-18 | 浙江大学 | Load-sensitive forklift load port independent control system and method |
| CN114436173A (en) * | 2022-01-07 | 2022-05-06 | 合肥工业大学 | Forklift hydraulic transmission system and forklift transmission control system |
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