CN114538325A - Full-electric fork truck with double-path descending system - Google Patents
Full-electric fork truck with double-path descending system Download PDFInfo
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- CN114538325A CN114538325A CN202210127511.4A CN202210127511A CN114538325A CN 114538325 A CN114538325 A CN 114538325A CN 202210127511 A CN202210127511 A CN 202210127511A CN 114538325 A CN114538325 A CN 114538325A
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- power unit
- oil
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- hydraulic fluid
- way
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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
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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
- 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
- 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
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
The invention discloses a full-electric fork truck with a two-way descending system, which is characterized in that: including crotch, automobile body, tertiary complete free portal, footboard, guardrail, operating handle and drive the actuating mechanism that the tertiary complete free portal goes up and down, double-circuit descent system is including the power unit, interior lift cylinder, two outer lift cylinders, hydraulic pressure pipeline, first hydraulic fluid port and the second hydraulic fluid port that have power unit P1 mouth and power unit P2 mouth, first hydraulic fluid port passes through the hydraulic pressure pipeline intercommunication power unit P2 mouth plays the oil return effect, the second hydraulic fluid port passes through the hydraulic pressure pipeline intercommunication power unit P1 mouth plays the effect of oil feed, oil return, interior lift cylinder passes through hydraulic pressure pipeline and two series connection between the outer lift cylinder. This pile high car is through setting up two hydraulic fluid ports that descend to the hydraulic fluid port that descends that corresponds in power unit department is connected to the rubber tube, can improve work efficiency effectively, user's use experience is strengthened.
Description
Technical Field
The invention relates to the technical field of fork lift trucks, in particular to a full-electric fork lift truck with a double-path descending system.
Background
The stacking vehicle is various wheel type carrying vehicles for loading, unloading, stacking and short-distance transportation of finished pallet goods. The fork truck is also called a fork truck and a pallet fork truck, and the international organization for standardization ISO/TC110 is called an industrial vehicle.
The forklift is widely applied to factory workshops, warehouses, circulation centers, distribution centers, ports, stations, airports, cargo yards and the like, can enter cabins, carriages and containers to load, unload and carry pallet goods, and is indispensable equipment for pallet transportation and container transportation.
The fork truck has simple structure, flexible operation, good jogging property and high explosion-proof safety performance, is suitable for operation in narrow passages and limited spaces, and is ideal equipment for loading and unloading pallets in elevated warehouses and workshops. The composite material can be widely applied to industries such as petroleum, chemical industry, pharmacy, light textile, military industry, paint, pigment, coal and the like, and places containing explosive mixtures such as ports, railways, goods yards, warehouses and the like, and can enter cabins, carriages and containers to carry out loading, unloading, stacking and carrying operations of tray goods. Along with the progress of science and technology, the fork lift truck is gradually evolved into electric control from traditional manual control, and the operation of electronic heap height can greatly improve work efficiency, alleviates workman's intensity of labour, wins market competition's chance for the enterprise.
The electric fork truck is an industrial carrying vehicle taking a motor as power and a storage battery as energy. The electronic fork truck includes: full-electric stacker, semi-electric stacker, forward full-electric stacker, forward stacker, and walking balance weight stacker.
In the prior art, in the descending process of the full-electric fork lift truck, the oil cylinder of the conventional design scheme only has one oil outlet, the descending of the oil cylinder is usually realized by the dead weight, and if the dead weight is not enough under the no-load condition, the descending speed is slow, the working efficiency is difficult to ensure, and the popularization and the application of the full-electric fork lift truck in the market are not facilitated.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the full-electric fork truck with the two-way descending system, and the two descending oil ports are arranged, and the corresponding descending oil port is arranged at the position where the rubber pipe is connected with the power unit, so that the working efficiency can be effectively improved, the use experience of a user is enhanced, and the popularization and the application of the fork truck in the market are facilitated.
In order to realize the aim, the invention adopts the following technical scheme that the full-electric fork truck with a double-path descending system is characterized in that: the fork frame is mounted at the front end of the vehicle body, the portal frame is mounted between the vehicle body and the fork frame, the pedal is mounted at the rear end of the vehicle body, the guardrail is arranged above the pedal, and the operating handle is mounted on the vehicle body; still include double-circuit decline system, double-circuit decline system is including the power unit, interior lift cylinder, two outer lift cylinders, hydraulic line, first hydraulic fluid port and the second hydraulic fluid port that have power unit P1 mouth and power unit P2 mouth, first hydraulic fluid port passes through hydraulic line intercommunication power unit P1 mouth plays the oil return effect, the second hydraulic fluid port passes through hydraulic line intercommunication power unit P2 mouth plays the effect of oil feed, oil return, interior lift cylinder passes through hydraulic line and two series connection between the outer lift cylinder.
As a preferable scheme of the present invention, there is a pressure difference setting between the inner lift cylinder and the outer lift cylinder.
As a preferable scheme of the invention, the two outer lifting oil cylinders are symmetrically arranged at two sides of the inner lifting oil cylinder.
In a preferable scheme of the invention, a P1 oil port descending electromagnetic valve is arranged at the P1 port of the power unit.
In a preferable scheme of the invention, a P2 oil port descending electromagnetic valve is arranged at the P2 port of the power unit.
As a preferable mode of the present invention, the P1 oil port lowering solenoid valve and the P2 oil port lowering solenoid valve are both two-position three-way solenoid valves.
As a preferable scheme of the invention, the power unit is further provided with an overflow valve.
As a preferable scheme of the present invention, an oil suction pump and an oil suction pipe are installed at the bottom of the power unit, and the oil suction pump is connected between the power unit and the oil suction pipe.
As a preferable scheme of the invention, the power unit is further connected with two oil return pipes, and the two oil return pipes are respectively communicated with the hydraulic pipeline.
In a preferred embodiment of the present invention, the oil suction pump is a gear pump.
Compared with the prior art, the invention has the following beneficial effects: according to the all-electric fork truck with the double-path descending system, the descending oil port is additionally formed in the inner lifting oil cylinder, so that the descending efficiency of the fork frame can be effectively improved, the working efficiency of the fork truck is improved, the use experience of a user is enhanced, and the popularization and the application of the fork truck in the market are facilitated.
Furthermore, the two outer lifting oil cylinders are arranged and symmetrically arranged on the two sides of the inner lifting oil cylinder, so that the stability of the fork frame in the ascending or descending process can be effectively ensured, the stability of the fork frame in the using process is further ensured, and the use experience of a user is enhanced.
Furthermore, the overflow valve is arranged at the power unit, so that the stability of a hydraulic system and the safety of the whole vehicle can be effectively ensured.
Drawings
FIG. 1 is a schematic structural diagram of an all-electric fork lift truck with a two-way descent system in an embodiment of the present invention;
FIG. 2 is a schematic view of the interior of an all-electric fork lift truck with a two-way lowering system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an all-electric fork lift truck with a two-way descent system in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an all-electric fork lift truck with a two-way descent system according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of a configuration at a power unit in an all-electric fork lift truck having a two-way descent system in an embodiment of the present invention;
fig. 6 is a schematic diagram of a power unit in an all-electric forklift having a two-way descent system according to an embodiment of the present invention.
Reference numerals: 1. a fork; 2. a vehicle body; 3. a gantry; 4. a pedal; 5. a guardrail; 6. an operating handle; 7. an internal lift cylinder; 8. an outer lift cylinder; 9. a hydraulic line; 10. a power unit; 11. power unit port P1; 12. power unit port P2; 13. a first oil port; 14. a P1 port descending solenoid valve; 15. a P2 oil port descending electromagnetic valve; 16. an overflow valve; 17. an oil suction pump; 18. an oil return pipe; 19. an oil suction pipe; 20. a second oil port.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Example (b): as shown in fig. 1 to 6, an all-electric fork truck with a two-way lowering system mainly comprises a fork carriage 1, a truck body 2, a gantry 3, a pedal 4, a guardrail 5, an operating handle 6 and a driving mechanism for driving the gantry 3 to ascend and descend, wherein the fork carriage 1 is mounted at the front end of the truck body 2 and is used for forking goods; the gantry 3 is installed between the body 2 and the fork carriage 1, the pedal 4 is installed at the rear end of the body 2, the guard rail 5 is installed above the pedal 4, the operating handle 6 is installed on the body 2, and the gantry 3 is a three-stage fully-free gantry.
In the prior art, in the descending process of the full-electric stacker, the oil cylinder of the conventional design scheme only has one oil outlet, the descending of the oil cylinder is usually realized by the dead weight, and if the dead weight is not enough under the no-load condition, the descending speed is slow, the working efficiency is difficult to ensure, and the popularization and the application of the full-electric stacker on the market are not facilitated. In order to solve the technical problem, a two-way descending system is provided in this embodiment, the two-way descending system includes a power unit 10 having a power unit P1 port 11 and a power unit P2 port 12, an inner lifting cylinder 7, two outer lifting cylinders 8, a hydraulic pipeline 9, a first oil port 13 and a second oil port 20, the first oil port 13 communicates with the power unit P2 port 12 through the hydraulic pipeline 9 to perform an oil return function, the second oil port 20 communicates with the power unit P1 port 11 through the hydraulic pipeline 9 to perform oil inlet and oil return functions, and the inner lifting cylinder 7 is connected in series with the two outer lifting cylinders 8 through the hydraulic pipeline 9. Above-mentioned first hydraulic fluid port 13 all has the effect of decline oil return with second hydraulic fluid port 20, compares in prior art only to set up a decline hydraulic fluid port, and this kind of mode can effectively improve the decline efficiency of crotch 1, and then improves the work efficiency of piling high car, and reinforcing user's use is experienced, is favorable to above-mentioned popularization and application of piling high car on market.
In order to ensure the stability of the fork carriage 2 during lowering or raising, the two outer lift cylinders 8 are symmetrically arranged on both sides of the inner lift cylinder 7.
The power unit P1 provides hydraulic power through the hydraulic line 9 to the inner lift cylinder 7 and the outer lift cylinder 8. at this time, the inner lift cylinder 7 is lifted first because of the pressure difference between the inner lift cylinder 7 and the outer lift cylinder 8, and after the inner lift cylinder 7 has completed its stroke, the outer lift cylinder 8 is lifted continuously until it reaches the working height. The oil cylinder descends by means of dead weight, at the moment, the dead weight borne by the outer lifting oil cylinder 8 is larger than that of the inner lifting oil cylinder 7, so that the outer lifting oil cylinder 7 descends preferentially, and then the inner lifting oil cylinder 7 continues to descend to return to the original position.
In order to cooperate with different circuits to realize expected control and thus play a driving role, a P1 oil port descending solenoid valve 14 is arranged at a P1 port 11 of the power unit, a P2 oil port descending solenoid valve 15 is arranged at a P2 port 12 of the power unit, and the P1 oil port descending solenoid valve 14 and the P2 oil port descending solenoid valve 15 are both two-position three-way solenoid valves, so that air can be prevented from entering the power unit 10, and the quality of oil products can be ensured.
The power unit P1 port 11 is communicated with a P1 port descending oil passage, the power unit P2 port 12 is communicated with a P2 port descending oil passage, a P1 port descending oil passage and a P2 port descending oil passage are arranged in a mutually vertical mode in space, pressure compensation throttle valves are installed in the P1 port descending oil passage and the P2 port descending oil passage, the pressure difference between the inlet and the outlet of each throttle valve is basically constant through the pressure valves, the flow rate is only related to the opening area under the condition that the pressure difference is not changed according to an orifice flow rate calculation formula, the flow rate can be guaranteed to be stable as long as the area is determined, fluctuation cannot occur, and the stability of the power unit 10 in the operation process can be effectively guaranteed.
The power unit 10 is provided with an overflow valve 16, and the power unit 10 further comprises a lifting motor, wherein a lifting oil duct and an overflow channel are arranged in the lifting motor, a one-way valve is arranged at one end of the lifting oil duct, and the overflow channel is communicated with the overflow valve 16. An oil suction pump 17 and an oil suction pipe 19 are installed at the bottom of the power unit 10, and the oil suction pump 17 is connected between the power unit 10 and the oil suction pipe 19. The power unit 10 is further connected with two oil return pipes 18, and the two oil return pipes 18 are respectively communicated with the hydraulic pipeline 9.
When the lifting motor works, the oil suction pump 17 which is a gear pump is driven to work, hydraulic oil is sucked out of the oil tank, passes through the lifting oil channel, descends the two-position three-way electromagnetic valve and the descending oil channel through the one-way valve and the P1 oil port, enters the hydraulic pipeline 9, and finally reaches the oil cylinder to start working. In the working process, if the pressure of the hydraulic system is too large or the load of the vehicle is too large, hydraulic oil in the lifting oil passage overflows through the overflow valve 16 on the descending oil passage, and the hydraulic oil returns to the oil tank again, so that the stability of the hydraulic system and the safety of the whole vehicle are ensured.
In order to avoid the damage to the oil suction pump 17 or the lifting motor caused by the impurities entering the lifting motor or the oil suction pump 17 from the oil tank, a filter screen is arranged at the suction port of the oil suction pipe 19.
In the fully electric fork truck with the two-way descending system, the descending oil port is additionally arranged on the inner lifting oil cylinder, so that the descending efficiency of the fork frame can be effectively improved, the working efficiency of the fork truck is further improved, the use experience of a user is enhanced, and the popularization and the application of the fork truck in the market are facilitated; by arranging the two outer lifting oil cylinders and symmetrically arranging the two outer lifting oil cylinders on two sides of the inner lifting oil cylinder, the stability of the fork frame in the ascending or descending process can be effectively ensured, the stability of the fork frame in the using process is further ensured, and the use experience of a user is enhanced; the overflow valve is arranged at the power unit, so that the stability of a hydraulic system and the safety of the whole vehicle can be effectively guaranteed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: 1. a fork; 2. a vehicle body; 3. a gantry; 4. a pedal; 5. a guardrail; 6. an operating handle; 7. an internal lift cylinder; 8. an outer lift cylinder; 9. a hydraulic line; 10. a power unit; 11. power unit port P1; 12. power unit port P2; 13. a first oil port; 14. a P1 port descending solenoid valve; 15. a P2 port descending solenoid valve; 16. an overflow valve; 17. an oil suction pump; 18. an oil return pipe; 19. an oil suction pipe; 20. second port, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. The utility model provides a full-electric fork truck with two-way decline system which characterized in that: the fork frame comprises a fork frame (1), a vehicle body (2), a portal frame (3), pedals (4), a guardrail (5), an operating handle (6) and a driving mechanism for driving the portal frame (3) to ascend and descend, wherein the fork frame (1) is installed at the front end of the vehicle body (2), the portal frame (3) is installed between the vehicle body (2) and the fork frame (1), the pedals (4) are installed at the rear end of the vehicle body (2), the guardrail (5) is arranged above the pedals (4), and the operating handle (6) is installed on the vehicle body (2); still include double-circuit decline system, double-circuit decline system is including power unit (10), interior lift cylinder (7), two outer lift cylinders (8), hydraulic line (9), first hydraulic fluid port (13) and second hydraulic fluid port (20) that have power unit P1 mouth (11) and power unit P2 mouth (12), first hydraulic fluid port (13) are passed through hydraulic line (9) intercommunication power unit P2 mouth (12) play the oil return effect, second hydraulic fluid port (20) are passed through hydraulic line (9) intercommunication power unit P1 mouth (11) play the effect of oil feed, oil return, interior lift cylinder (7) pass through hydraulic line (9) and two series connection between outer lift cylinder (8).
2. An all-electric fork lift truck with a two-way descent system according to claim 1, wherein: and pressure difference is set between the inner lifting oil cylinder (7) and the outer lifting oil cylinder (8).
3. An all-electric fork lift truck with a two-way descent system according to claim 2, wherein: the two outer lifting oil cylinders (8) are symmetrically arranged on two sides of the inner lifting oil cylinder (7).
4. An all-electric fork lift truck with a two-way lowering system according to claim 3, characterized in that: and a P1 oil port descending electromagnetic valve (14) is arranged at the position of the P1 port (11) of the power unit.
5. An all-electric fork lift truck with a two-way lowering system according to claim 4, characterized in that: and a P2 oil port descending electromagnetic valve (15) is arranged at the position of the P2 port (12) of the power unit.
6. An all-electric fork lift truck with a two-way lowering system according to claim 5, characterized in that: the P1 oil port descending solenoid valve (14) and the P2 oil port descending solenoid valve (15) are both two-position three-way solenoid valves.
7. An all-electric fork lift truck with a two-way lowering system according to claim 6, characterized in that: the power unit (10) is also provided with an overflow valve (16).
8. An all-electric fork lift truck with a two-way lowering system according to claim 7, characterized in that: an oil suction pump (17) and an oil suction pipe (19) are installed at the bottom of the power unit (10), and the oil suction pump (17) is connected between the power unit (10) and the oil suction pipe (19).
9. An all-electric fork lift truck with a two-way lowering system according to claim 8, characterized in that: the power unit (10) is further connected with two oil return pipes (18), and the two oil return pipes (18) are respectively communicated with the hydraulic pipeline (9).
10. An all-electric fork lift truck with a two-way lowering system according to claim 9, characterized in that: the oil suction pump (17) is a gear pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127511.4A CN114538325A (en) | 2022-02-11 | 2022-02-11 | Full-electric fork truck with double-path descending system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210127511.4A CN114538325A (en) | 2022-02-11 | 2022-02-11 | Full-electric fork truck with double-path descending system |
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| Publication Number | Publication Date |
|---|---|
| CN114538325A true CN114538325A (en) | 2022-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210127511.4A Pending CN114538325A (en) | 2022-02-11 | 2022-02-11 | Full-electric fork truck with double-path descending system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114538325A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012250817A (en) * | 2011-06-03 | 2012-12-20 | Nippon Yusoki Co Ltd | Hydraulic system and forklift including the same |
| CN203239658U (en) * | 2013-05-24 | 2013-10-16 | 淮安威博液压有限公司 | Power unit for double-speed full-electric stacking vehicle |
| CN204508711U (en) * | 2015-04-16 | 2015-07-29 | 威海建设集团股份有限公司安装分公司 | Sectional type half electric stacker |
| CN205061482U (en) * | 2015-09-30 | 2016-03-02 | 浙江上加机械有限公司 | All -electric carrier |
| CN213834429U (en) * | 2020-11-17 | 2021-07-30 | 安徽合力股份有限公司 | Forklift two-stage full-free portal hydraulic pipeline system with double oil ways |
-
2022
- 2022-02-11 CN CN202210127511.4A patent/CN114538325A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012250817A (en) * | 2011-06-03 | 2012-12-20 | Nippon Yusoki Co Ltd | Hydraulic system and forklift including the same |
| CN203239658U (en) * | 2013-05-24 | 2013-10-16 | 淮安威博液压有限公司 | Power unit for double-speed full-electric stacking vehicle |
| CN204508711U (en) * | 2015-04-16 | 2015-07-29 | 威海建设集团股份有限公司安装分公司 | Sectional type half electric stacker |
| CN205061482U (en) * | 2015-09-30 | 2016-03-02 | 浙江上加机械有限公司 | All -electric carrier |
| CN213834429U (en) * | 2020-11-17 | 2021-07-30 | 安徽合力股份有限公司 | Forklift two-stage full-free portal hydraulic pipeline system with double oil ways |
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