CN118561210A - Full-free portal hydraulic system of forklift - Google Patents
Full-free portal hydraulic system of forklift Download PDFInfo
- Publication number
- CN118561210A CN118561210A CN202410858184.9A CN202410858184A CN118561210A CN 118561210 A CN118561210 A CN 118561210A CN 202410858184 A CN202410858184 A CN 202410858184A CN 118561210 A CN118561210 A CN 118561210A
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- Prior art keywords
- oil
- oil supply
- free
- pipe
- oil return
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- 239000003921 oil Substances 0.000 description 172
- 238000000034 method Methods 0.000 description 10
- 239000010720 hydraulic oil Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B66F9/07504—Accessories, e.g. for towing, charging, locking
-
- 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
- B66F9/08—Masts; Guides; Chains
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The application discloses a full-free portal hydraulic system of a forklift, which comprises a free cylinder, an edge cylinder and an oil supply device, wherein the oil supply device is provided with an oil supply main pipe and an oil return main pipe which are communicated with the inner cavity of the oil supply main pipe, two paths of oil supply pipes are respectively connected with the free cylinder and the edge cylinder, the oil return main pipe is divided into two paths of oil return pipes which are respectively connected with the free cylinder and the edge cylinder, control valve groups are respectively arranged on the two paths of oil return pipes, and the two control valve groups are respectively used for controlling the oil return speeds of the free cylinder and the edge cylinder so as to control the piston rods of the free cylinder and the edge cylinder to retract synchronously. The application can drive the piston rods of the side cylinder and the free cylinder to retract synchronously so as to improve the unloading speed of the forklift gantry and reduce the speed-up cost.
Description
Technical Field
The invention relates to the technical field of forklift mast, in particular to a hydraulic system of a full-free mast of a forklift.
Background
The fork truck full-free portal is a portal with the function of keeping the inner portal stationary and keeping the appearance height of the fork truck unchanged when the fork truck moves along the inner portal for all strokes. For example, three-stage full-free gantries typically have an inner gantry, a middle gantry, and an outer gantry, the fork carriage connects the inner gantry, which can be lifted along the inner gantry, the middle gantry is inserted in the outer gantry, which can be lifted along the outer gantry, and a movable pulley structure is provided between the inner gantry and the middle gantry, which can be lifted along with the middle gantry.
In addition, the function of the fork truck full-free portal is realized mainly through a hydraulic system, a free cylinder in the hydraulic system is used for driving a fork frame to lift, a side cylinder is used for driving a middle portal frame to lift, and the middle portal frame further drives an inner portal frame to lift by utilizing a movable pulley structure.
When the existing hydraulic system is used for oil return operation, the side cylinder and the free cylinder are all converged and connected with the oil supply device through the same pipeline, so that in the descending process of the existing portal frame, the piston rods of the side cylinder and the free cylinder cannot be retracted synchronously due to the fact that the side cylinder and the free cylinder are connected with the same oil return pipeline, and even if the fork frame and the middle portal frame cannot descend simultaneously. Therefore, the existing hydraulic system drives the lowering speed of the forklift mast to be slower, if the lowering speed of the forklift mast needs to be improved, the valve size on the oil return pipeline is mostly increased, namely the drift diameter of the valve is increased, and the valve cost of the valve with the large drift diameter valve core is larger.
In summary, how to solve the problems of slow descending speed and high accelerating cost of the forklift mast caused by the fact that the conventional hydraulic system cannot drive the piston rods of the side cylinders and the free cylinders to retract synchronously is a urgent problem to be solved by those skilled in the art.
Disclosure of Invention
Therefore, the invention aims to provide a full-free gantry hydraulic system of a forklift, which can drive piston rods of an edge cylinder and a free cylinder to retract synchronously so as to improve the unloading speed of the forklift gantry and reduce the speed raising cost.
In order to achieve the above object, the present invention provides the following technical solutions:
The utility model provides a full free portal hydraulic system of fork truck, includes free cylinder, limit jar and oil supply unit, oil supply unit be equipped with rather than the oil supply main pipe and the oil return main pipe of inner chamber intercommunication, the oil supply main pipe divide two way oil supply pipe to be connected respectively free cylinder with the limit jar, the oil return main pipe divide two way oil return pipe to be connected respectively free cylinder with the limit jar, and two way all be equipped with the control valves on the oil return pipe, two control valves are used for control respectively free cylinder with the oil return speed of limit jar, in order to control free cylinder with the synchronous withdrawal of piston rod of limit jar.
Preferably, the control valve group comprises a proportional valve and a pressure compensator, and the proportional valve and the pressure compensator are arranged in sequence from far to near from the oil return main pipe.
Preferably, the control valve group comprises a descending switch valve and a speed limiting valve, and the descending switch valve and the speed limiting valve are arranged in sequence from far to near from the oil return main pipe.
Preferably, the main oil supply pipe is sequentially provided with a pump and a lifting switch valve along the sequence from near to far from the oil supply device, and a pump shaft of the pump is connected with a motor for driving the pump to rotate.
Preferably, the two paths of oil supply pipes are provided with one-way valves at positions close to the oil supply main pipe for preventing oil from flowing back.
Preferably, a connecting pipe is arranged between the oil supply main pipe and the oil return main pipe, and an overflow valve is arranged on the connecting pipe.
Preferably, the oil inlet end and the oil return end of the free cylinder are connected with one oil supply pipe, and one oil return pipe is connected between one oil supply pipe and the oil return main pipe;
The oil inlet end and the oil return end of the side cylinder are connected with the other path of oil supply pipe, and the other path of oil return pipe is connected between the other path of oil supply pipe and the oil return main pipe.
Preferably, the end part of one path of the oil supply pipe, which is close to the free cylinder, is provided with an explosion-proof valve, and the end part of the other path of the oil supply pipe, which is close to the side cylinder, is provided with an explosion-proof valve.
Preferably, an oil suction filter is arranged at the end part of the oil supply main pipe, which is close to the oil supply device, and an oil return filter is arranged at the end part of the oil return main pipe, which is close to the oil supply device.
The full-free portal hydraulic system of the forklift truck is used for driving the forklift truck portal to lift, the free cylinder and the side cylinder are respectively connected with an oil supply device through two oil supply pipes separated by an oil supply main pipe, the free cylinder and the side cylinder are respectively connected with the oil supply device through two oil return pipes separated by an oil return main pipe, and control valve groups are arranged on the two oil return pipes. Therefore, oil liquid backflow of the free cylinder and the side cylinder is completed through two independent and disjoint oil return pipes respectively, and in the oil liquid backflow process, the oil liquid flow speed of each oil return pipe is controlled by a control valve group on the oil liquid return pipe to reach the required flow speed, so that piston rods of the free cylinder and the side cylinder retract synchronously, further, a fork frame and a middle door frame descend simultaneously, the descending speed of the fork frame is improved, and compared with the existing hydraulic system, the descending speed of the fork frame is improved by increasing the size of a valve body.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a forklift mast in an initial state;
Fig. 2 is a schematic view of a forklift mast in a first state;
Fig. 3 is a schematic view of a forklift mast in a second state;
Fig. 4 is a schematic view of a forklift mast in a third state;
Fig. 5 is a schematic view of a forklift mast in a fourth state;
Fig. 6 is a schematic diagram of a hydraulic system of a full-free gantry of a forklift.
Reference numerals:
01-fork carriage; 02-an inner portal; 03-a middle portal; 04-an outer portal;
1-side cylinder; 2-a free cylinder; 3-an oil supply device; 4-an oil supply main pipe; 5-an oil supply pipe; 6, an oil return main pipe; 7-an oil return pipe; 8-overflow valve;
41-an oil absorption filter; 42-a pump; 43-motor; 44-lifting switch valve;
51-a one-way valve; 52-an explosion-proof valve;
61-an oil return filter;
71-a control valve group; 711-proportional valve; 712-a pressure compensator; 72-emergency manual drop valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a full-free portal hydraulic system of a forklift, which can drive piston rods of an edge cylinder and a free cylinder to retract synchronously so as to improve the unloading speed of the forklift portal and reduce the speed raising cost.
It should be noted that, in the present embodiment, the orientation or positional relationship indicated by "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Referring to fig. 6, the application provides a full-free portal hydraulic system of a forklift, which comprises a free cylinder 2, an edge cylinder 1 and an oil supply device 3, wherein the oil supply device 3 is provided with an oil supply main pipe 4 and an oil return main pipe 6 which are communicated with the inner cavity of the oil supply main pipe 4, two oil supply pipes 5 are respectively connected with the free cylinder 2 and the edge cylinder 1, two oil return pipes 7 are respectively connected with the free cylinder 2 and the edge cylinder 1, the two oil return pipes 7 are respectively provided with a control valve group 71, and the two control valve groups 71 are respectively used for controlling the oil return speeds of the free cylinder 2 and the edge cylinder 1 so as to control the piston rods of the free cylinder 2 and the edge cylinder 1 to retract synchronously.
Specifically, the oil supply device 3 stores hydraulic oil, and an oil supply main pipe 4 and an oil return main pipe 6 are respectively arranged at an oil outlet end and an oil return end of the oil supply device. The oil supply main pipe 4 is separated into two paths of oil supply pipes 5 at one end far away from the oil outlet end, one path of oil supply pipe 5 is connected with the free cylinder 2, the other path of oil supply pipe 5 is connected with the side cylinder 1, even if the free cylinder 2 and the side cylinder 1 are respectively connected with the oil supply device 3 through the two paths of oil supply pipes 5 separated from the oil supply main pipe 4, in the portal lifting process, the hydraulic system builds pressure, the system pressure firstly reaches the pressure value required by the free cylinder 2, the free cylinder 2 stretches out to lift the fork frame 01, the system pressure continues to be boosted to reach the pressure value required by the side cylinder 1, the side cylinder 1 lifts the middle portal 03, and pulls the inner portal 02 to lift, and the portal lifting process is the same as the existing portal lifting process, in the sequence shown in fig. 2 to 4; the oil return main pipe 6 is far away from one end of the oil return end and is divided into two paths of oil return pipes 7, one path of oil return pipe 7 is connected with the free cylinder 2, the other path of oil return pipe 7 is connected with the side cylinder 1, even if the free cylinder 2 and the side cylinder 1 are respectively connected with the oil supply device 3 through the two paths of oil return pipes 7 which are divided by the oil return main pipe 6, oil in the free cylinder 2 and the side cylinder 1 are respectively converged in the oil return main pipe 6 through the two paths of independent and disjoint oil return pipes 7, the oil flow speed of the free cylinder 2 and the side cylinder 1 respectively and correspondingly connected with the oil return pipes 7 in the oil return process reaches the required flow speed through control valves on the oil return pipes, so that the control valve group 71 on the two paths of the oil return pipes 7 is simultaneously opened, the oil flow speeds in the two paths of the oil return pipes 7 reach the required flow speed, the piston rods of the free cylinder 2 and the side cylinder 1 are synchronously retracted, the fork frame 01 and the middle frame 03 are simultaneously lowered, as shown in sequence from figures 4, 5 and 1, and the lowering speed of the fork frame is improved. In addition, compared with the existing hydraulic system, the application improves the descending speed of the forklift mast by increasing the size of the valve body, avoids changing the sizes of the valve body and the connecting pipeline thereof, and further saves the accelerating cost.
The control valve set 71 has two embodiments, in an example, referring to fig. 6, the control valve set 71 includes a proportional valve 711 and a pressure compensator 712, which are sequentially arranged from the oil return main pipe 6.
The proportional valve 711 can adjust the oil flow rate by adjusting the opening size, but since the system pressure is not constant, even if the pressure difference between the front and rear of the proportional valve 711 is always changed, the oil speed is not constant, when the pressure compensator 712 is provided, even if the pressure in the system is changed, the pressure compensator 712 can automatically adjust the flow rate passing through the proportional valve 711, thereby keeping the pressure difference between the front and rear of the proportional valve 711 constant, even if the oil return speed is constant. Accordingly, the control valve group 71 can be used to adjust the flow rate of the oil in the oil return pipe 7 and further adjust the lowering speed of the forklift mast according to the user's need.
In another embodiment, the control valve group 71 includes a descent switching valve and a speed limiting valve, which are arranged in order from the oil return main pipe 6 from far to near.
The valve port size of the speed limiting valve is fixed, the speed limiting valve is suitable for the working condition that the descending form of the forklift mast is constant-speed descending, and the descending switch valve is used for controlling the on-off of the oil return pipe 7, so that the opening and closing of the descending operation of the forklift mast are controlled.
It should be noted that, the control valve groups 71 of the above two embodiments are all connected with the control device through signals, so as to realize the lowering operation of the remote control forklift mast.
Optionally, referring to fig. 6, two oil return pipes 7 are connected with an emergency manual descending valve 72 parallel to the control valve set 71, so as to descend the forklift mast in case of failure of the control valve set 71.
Considering the on-off control of the lifting of the forklift mast, referring to fig. 6, the main oil supply pipe 4 is sequentially provided with a pump 42 and a lifting switch valve 44 in the order from the near to the far from the oil supply device 3, and the pump 42 shaft of the pump 42 is connected with a motor 43 for driving the pump 42 to rotate. Thus, an operator can realize the opening and closing control of the lifting of the forklift gantry by controlling the lifting switch valve 44 and the switch of the motor 43.
The motor 43 and the lifting switch valve 44 are connected with the control device by signals to realize the lifting operation of the remote control forklift gantry.
In order to ensure the normal operation of the hydraulic system, referring to fig. 6, the two oil supply pipes 5 are provided with check valves 51 at positions close to the main oil supply pipe 4, so as to prevent the oil from flowing back and ensure that the oil flows into the free cylinder 2 and the side cylinder 1 in a predetermined direction.
In order to protect the safety of the hydraulic system, please refer to fig. 6 based on the above embodiment, a connecting pipe is provided between the oil supply main pipe 4 and the oil return main pipe 6, and an overflow valve 8 is provided on the connecting pipe.
It can be understood that in the lifting process of the forklift mast, the oil supply device 3 continuously supplies oil to the side cylinder 1 and the free cylinder 2, the system pressure continuously increases until the pressure value set by the overflow valve 8 is reached, at this time, the piston rods of the side cylinder 1 and the free cylinder 2 extend to the maximum stroke, and the residual oil in the oil supply main pipe 4 flows back to the oil supply device 3 through the connecting pipe and the oil return main pipe 6 in sequence, so that the pressure stability of the hydraulic system is ensured.
In order to save installation space and cost, referring to fig. 6, on the basis of the above embodiment, the oil inlet end and the oil return end of the free cylinder 2 are connected with one oil supply pipe 5, and one oil return pipe 7 is connected between the one oil supply pipe 5 and the oil return main pipe 6; the oil inlet end and the oil return end of the side cylinder 1 are connected with another oil supply pipe 5, and another oil return pipe 7 is connected between the other oil supply pipe 5 and the oil return main pipe 6.
As can be seen from the above, one oil return pipe 7 is disposed between one oil supply pipe 5 connected to the free cylinder 2 and the oil return main pipe 6, and the other oil return pipe 7 is disposed between the other oil supply pipe 5 connected to the side cylinder 1 and the oil return main pipe 6, even if the two oil return pipes 7 are connected to the two oil supply pipes 5 in a one-to-one correspondence manner, during the lowering process of the forklift mast, the motor 43 and the lifting switch valve 44 are closed, and the oil supply device 3 does not supply oil to the two oil supply pipes 5, at this time, the oil supply pipe 5 plays a role of communicating the oil return pipe 7 with the cylinder, namely, is equivalent to an oil inlet pipe section where the oil return pipe 7 is connected with the cylinder, so as to save the overall length of the oil return pipe 7, and save installation space and cost.
The side cylinders 1 for driving the middle mast 03 to move up and down are usually provided in two, and thus, the present application is used for dividing the oil supply pipe 5 for connecting the side cylinders 1 into two branch pipes, one branch pipe is connected with one side cylinder 1, and the other branch pipe is connected with the other side cylinder 1.
To further ensure the safety of the hydraulic system, referring to fig. 6, an explosion-proof valve 52 is disposed at the end of one oil supply pipe 5 near the free cylinder 2, and an explosion-proof valve 52 is disposed at the end of the other oil supply pipe 5 near the side cylinder 1. Thus, if the oil supply pipe 5 suddenly breaks, the explosion-proof valve 52 can instantaneously block the oil path, i.e. prevent the system pressure from being reduced in a uncontrolled manner, so as to achieve the purpose of safety.
In order to improve the normal operation time of the hydraulic system, referring to fig. 6, the end of the main oil supply pipe 4, which is close to the oil supply device 3, is provided with an oil suction filter 41, which can remove the impurities of hydraulic oil, reduce the abrasion of each element of the pipeline, and facilitate the increase of the service life of the hydraulic system and the reduction of maintenance cost. In addition, the end of the oil return main pipe 6, which is close to the oil supply device 3, is provided with an oil return filter 61, so that impurities doped in the returned hydraulic oil can be removed, the cleanliness of the hydraulic oil returned to the oil supply device 3 is ensured, and the subsequent repeated clean utilization is facilitated.
In summary, the specific process of the full-free gantry hydraulic system for the forklift truck of the application for driving the forklift truck to lift is that when the forklift truck needs to lift, an operator opens the lifting switch valve 44 through the control device, and simultaneously controls the motor 43 to rotate at a certain rotation speed to drive the pump 42 to feed the hydraulic oil pump 42 in the oil supply device 3 into the oil supply main pipe 4, the hydraulic oil flows into the free cylinder 2and the side cylinder 1 through the two paths of oil supply pipes 5, and the free cylinder 2 firstly stretches out to lift the fork frame 01 due to the pressure difference between the side cylinder 1 and the free cylinder 2, as shown in the sequence from fig. 1to fig. 2, then the side cylinder 1 lifts the middle gantry 03, and pulls the inner gantry 02 to lift, as shown in the sequence from fig. 2 to fig. 4; when the forklift mast is required to descend, an operator simultaneously opens the proportional valve 711 or the descending switch valve of the two oil return pipes 7 through the control device, wherein the proportional valve 711 limits the maximum flow rate of oil under the action of the pressure compensator 712, correspondingly limits the maximum descending speed of the mast, the piston rods of the free cylinder 2and the side cylinder 1 retract synchronously, and the fork frame 01 and the middle frame 03 descend simultaneously, as shown in the sequence of fig. 4, 5 and 1.
It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The hydraulic system of the full-free portal of the forklift and the forklift provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. The utility model provides a full free portal hydraulic system of fork truck, its characterized in that, including free jar (2), limit jar (1) and oil supply unit (3), oil supply unit (3) be equipped with rather than the oil supply main pipe (4) and the oil return is responsible for (6) of inner chamber intercommunication, oil supply main pipe (4) divide two-way oil supply pipe (5) and connect respectively free jar (2) with limit jar (1), oil return main pipe (6) divide two-way oil return pipe (7) to connect respectively free jar (2) with limit jar (1), and two-way all be equipped with control valves (71) on oil return pipe (7), two control valves (71) are used for controlling respectively free jar (2) with the oil return speed of limit jar (1), in order to control free jar (2) with the piston rod of limit jar (1) is retracted in step.
2. The full free mast hydraulic system of claim 1, wherein the control valve block (71) comprises a proportional valve (711) and a pressure compensator (712) arranged in a sequence from far to near the return main pipe (6).
3. The full free mast hydraulic system of claim 1, wherein the control valve block (71) comprises a lowering switch valve and a speed limiting valve, both arranged in a sequence from far to near from the return main pipe (6).
4. The full-free portal hydraulic system of the forklift truck according to claim 1, wherein the oil supply main pipe (4) is sequentially provided with a pump (42) and a lifting switch valve (44) along the sequence from the near to the far from the oil supply device (3), and a motor (43) is connected to a pump (42) shaft of the pump (42) for driving the pump (42) to rotate.
5. The full-free portal hydraulic system of the forklift truck according to claim 1, wherein the positions of the two oil supply pipes (5) close to the oil supply main pipe (4) are respectively provided with a one-way valve (51) for preventing oil from flowing back.
6. The full-free portal hydraulic system of the forklift truck according to claim 1, characterized in that a connecting pipe is arranged between the oil supply main pipe (4) and the oil return main pipe (6), and an overflow valve (8) is arranged on the connecting pipe.
7. The full-free portal hydraulic system of the forklift truck according to claim 1, wherein an oil inlet end and an oil return end of the free cylinder (2) are connected with one oil supply pipe (5), and one oil return pipe (7) is connected between one oil supply pipe (5) and the oil return main pipe (6);
The oil inlet end and the oil return end of the side cylinder (1) are connected with the other path of oil supply pipe (5), and the other path of oil return pipe (7) is connected between the other path of oil supply pipe (5) and the oil return main pipe (6).
8. The full-free portal hydraulic system of the forklift truck according to claim 7, characterized in that the end of one of the oil supply pipes (5) close to the free cylinder (2) is provided with an explosion-proof valve (52), and the end of the other oil supply pipe (5) close to the side cylinder (1) is provided with an explosion-proof valve (52).
9. The full-free portal hydraulic system of a forklift truck according to any one of claims 1 to 8, characterized in that the end of the main oil supply pipe (4) close to the oil supply device (3) is provided with an oil suction filter (41), and the end of the main oil return pipe (6) close to the oil supply device (3) is provided with an oil return filter (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410858184.9A CN118561210A (en) | 2024-06-28 | 2024-06-28 | Full-free portal hydraulic system of forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410858184.9A CN118561210A (en) | 2024-06-28 | 2024-06-28 | Full-free portal hydraulic system of forklift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118561210A true CN118561210A (en) | 2024-08-30 |
Family
ID=92479319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410858184.9A Pending CN118561210A (en) | 2024-06-28 | 2024-06-28 | Full-free portal hydraulic system of forklift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118561210A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118811751A (en) * | 2024-09-19 | 2024-10-22 | 杭叉集团股份有限公司 | A dual oil circuit control system and control method for lifting of a forward-reaching forklift |
-
2024
- 2024-06-28 CN CN202410858184.9A patent/CN118561210A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118811751A (en) * | 2024-09-19 | 2024-10-22 | 杭叉集团股份有限公司 | A dual oil circuit control system and control method for lifting of a forward-reaching forklift |
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