CN114715819B - High-altitude parachuting simulation hydraulic lifting system - Google Patents
High-altitude parachuting simulation hydraulic lifting system Download PDFInfo
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- CN114715819B CN114715819B CN202210508055.8A CN202210508055A CN114715819B CN 114715819 B CN114715819 B CN 114715819B CN 202210508055 A CN202210508055 A CN 202210508055A CN 114715819 B CN114715819 B CN 114715819B
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- 238000004088 simulation Methods 0.000 title claims abstract description 24
- 238000010008 shearing Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 3
- 230000003028 elevating effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 38
- 230000005484 gravity Effects 0.000 description 5
- 239000010720 hydraulic oil Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001360 synchronised 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
- B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D23/00—Training of parachutists
-
- 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
- B66F13/00—Common constructional features or accessories
-
- 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
-
- 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
-
- 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
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- 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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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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)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a high-altitude parachuting simulation hydraulic lifting system, which comprises: oil supply unit, control unit and elevating system. The oil supply assembly comprises an oil tank and a motor pump set. The control assembly comprises a proportional reversing valve and an adjustable overflow valve, wherein the proportional reversing valve is provided with a P port, a T port, an A port and a B port. When the left station of the proportional reversing valve works, the port P is communicated with the port A, and the port B is communicated with the port T; when the middle station of the proportional reversing valve works, all oil ports are disconnected with each other; when the right station of the proportional reversing valve works, the port P is communicated with the port B, and the port A is communicated with the port T. An oil inlet of the lifting mechanism and one end of the adjustable overflow valve are connected in parallel with the port A, and an oil return port of the lifting mechanism and the other end of the adjustable overflow valve are connected in parallel with the oil tank. The system can control the lifting mechanism to ascend and descend, so that the state of high-altitude rapid descent can be simulated, and the efficiency and safety of high-altitude parachuting training are improved.
Description
Technical Field
The invention relates to a high-altitude parachuting simulation hydraulic lifting system.
Background
High-altitude parachuting is a very dangerous sport. In order to ensure that parachuting personnel master good operation skills and avoid safety accidents when the personnel jump in practice, skill training is generally required to be completed on the ground. At present, the existing training equipment lacks training equipment which truly simulates the high-altitude parachuting environment and ensures safety, and directly influences the efficiency and safety of high-altitude parachuting training.
Disclosure of Invention
The invention aims to overcome the defect that equipment for truly simulating a high-altitude parachuting environment is lacked in the prior art, and provides a high-altitude parachuting simulation hydraulic lifting system capable of solving the problems.
The invention solves the technical problems by the following technical scheme:
the utility model provides a high altitude parachuting simulation hydraulic lifting system which characterized in that, it includes:
the oil supply assembly comprises an oil tank and a motor pump set;
the control assembly comprises a proportional reversing valve and an adjustable overflow valve, the proportional reversing valve is a three-position four-way valve, the proportional reversing valve is provided with a P port, a T port, an A port and a B port, the P port is connected with an oil outlet of the motor pump set, and the T port is connected with the oil tank; when the left station of the proportional reversing valve works, the port P is communicated with the port A, and the port B is communicated with the port T; when the middle station of the proportional reversing valve works, all oil ports are disconnected with each other; when the right station of the proportional reversing valve works, the port P is communicated with the port B, and the port A is communicated with the port T;
the oil inlet of the lifting mechanism and one end of the adjustable overflow valve are connected in parallel with the port A, the oil return port of the lifting mechanism and the other end of the adjustable overflow valve are connected in parallel with the oil tank, and the lifting mechanism can ascend or descend.
Preferably, the lifting mechanism comprises a base, a shearing fork mechanism, a platform and a hydraulic cylinder, one end of the bottom of the shearing fork mechanism is hinged to the base, the other end of the bottom of the shearing fork mechanism is slidably connected with the base, one end of the top of the shearing fork mechanism is hinged to the platform, the other end of the top of the shearing fork mechanism is slidably connected with the platform, the hydraulic cylinder is connected to the shearing fork mechanism and drives the shearing fork mechanism to ascend or descend, a rodless cavity of the hydraulic cylinder is communicated with the opening A, and a rod cavity of the hydraulic cylinder is communicated with the oil tank.
Preferably, the lifting mechanism further comprises an explosion-proof valve, and the explosion-proof valve is arranged on a pipeline between the rodless cavity of the hydraulic cylinder and the port A.
Preferably, the high-altitude parachuting simulation hydraulic lifting system further comprises a safety valve, one end of the safety valve is connected to a pipeline between the motor pump group and the port A, and the other end of the safety valve is connected to the oil tank.
Preferably, the high-altitude parachuting simulation hydraulic lifting system further comprises a one-way valve, wherein the one-way valve is connected to a pipeline between the motor pump set and the port A, and the one-way valve and the safety valve are connected in parallel with the motor pump set.
Preferably, the high-altitude parachuting simulation hydraulic lifting system further comprises a flow distribution and collection valve, the flow distribution and collection valve is provided with three oil ports, the number of the hydraulic cylinders is two, one oil port of the flow distribution and collection valve is connected with the port A, the other two oil ports of the flow distribution and collection valve are connected with two rodless cavities of the hydraulic cylinders, and the explosion-proof valve is located on a pipeline between the rodless cavities of the hydraulic cylinders and the flow distribution and collection valve.
Preferably, a pressure gauge is connected to a pipeline between the motor pump set and the one-way valve.
Preferably, a pressure sensor is connected to a pipeline between the motor pump set and the one-way valve.
Preferably, the high-altitude parachuting simulation hydraulic lifting system further comprises a fan with an air outlet facing upwards vertically, the fan is mounted at the bottom of the platform, and the bottom plate of the platform is of a metal net structure.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The invention has the positive progress effects that: the system can control the lifting mechanism to slowly rise and quickly descend, so that the high-altitude quick descending state can be simulated, and the efficiency and safety of high-altitude parachuting training are improved.
Drawings
Fig. 1 is a hydraulic schematic diagram of a high-altitude parachuting simulation hydraulic lifting system in a preferred embodiment of the invention.
Fig. 2 is a schematic structural diagram of a hydraulic lifting system for simulating a high-altitude parachuting in a preferred embodiment of the invention.
Reference numerals illustrate:
Proportional reversing valve 210
T-port 212
A port 213
Explosion-proof valve 400
Flow dividing and collecting valve 600
One-way valve 900
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
Fig. 1 and 2 show a high-altitude parachuting simulation hydraulic lifting system, which comprises: the oil supply unit 100, the control unit 200, and the elevating mechanism 300. The oil supply assembly 100 includes an oil tank 110 and a motor pump unit 120. The control assembly 200 comprises a proportional reversing valve 210 and an adjustable overflow valve 220, the proportional reversing valve 210 is a three-position four-way valve, the proportional reversing valve 210 is provided with a P port 211, a T port 212, an A port 213 and a B port 214, the P port 211 is connected with an oil outlet of the motor pump set 120, and the T port 212 is connected with the oil tank 110. When the left station of the proportional reversing valve 210 works, the P port 211 is communicated with the A port 213, and the B port 214 is communicated with the T port 212; when the middle station of the proportional reversing valve 210 works, all oil ports are disconnected with each other; when the right station of the proportional reversing valve 210 works, the P port 211 is communicated with the B port 214, and the A port 213 is communicated with the T port 212. The oil inlet of the lifting mechanism 300 and one end of the adjustable overflow valve 220 are connected in parallel with the A port 213, the oil return port of the lifting mechanism 300 and the other end of the adjustable overflow valve 220 are connected in parallel with the oil tank 110, and the lifting mechanism 300 can ascend or descend.
The system is used for assisting high-altitude parachuting training, and the specific working process is as follows: when the training personnel need to rise to the highest position, the overflow pressure value of the adjustable overflow valve 220 is adjusted to be larger than the hydraulic pressure value of the gravity of the training personnel and the gravity of the lifting mechanism 300 to the system, the training personnel stand at the top of the lifting mechanism 300, the proportional reversing valve 210 is in a left station working state, the motor pump set 120 is started, hydraulic oil is input into the proportional reversing valve 210 through the motor pump set 120, and enters the lifting mechanism 300 through the P port 211 and the A port 213, so that the lifting mechanism 300 is driven to rise until the highest position is stopped. The lifting speed of the lifting mechanism 300 can be adjusted by adjusting the opening state of the proportional reverse valve 210. When the lifting mechanism 300 needs to be quickly lowered to simulate a parachuting state, the proportional reversing valve 210 is in an intermediate station working state, and the overflow pressure value of the adjustable overflow valve 220 is adjusted so that the pressure value is smaller than the hydraulic value of the gravity of a training person and the gravity of the lifting mechanism 300 on the system, and the training person descends along with the lifting mechanism 300 by means of the gravity at the moment, so that the training person feels the loss of weight of the parachuting. The lowering speed of the training personnel and the lifting mechanism 300 can be changed by adjusting the overflow pressure value of the adjustable overflow valve 220, so that the requirements of different training stages are met. When the system needs to be quickly drained, the proportional reversing valve 210 needs to be in a right station working state, and hydraulic oil in the system is quickly drained into the oil tank 110 through the A port 213 and the T port 212. The system can control the lifting mechanism 300 to slowly ascend and rapidly descend, so that the high-altitude rapid descending state can be simulated, and the efficiency and safety of high-altitude parachuting training are improved.
In this embodiment, the lifting mechanism 300 includes a base 310, a scissor mechanism 320, a platform 330 and a hydraulic cylinder 340, one end of the bottom of the scissor mechanism 320 is hinged to the base 310, the other end of the bottom of the scissor mechanism 320 is slidably connected to the base 310, one end of the top of the scissor mechanism 320 is hinged to the platform 330, the other end of the top of the scissor mechanism 320 is slidably connected to the platform 330, the hydraulic cylinder 340 is connected to the scissor mechanism 320 and drives the scissor mechanism 320 to ascend or descend, a rodless cavity of the hydraulic cylinder 340 is communicated with the port a 213, and a rod cavity of the hydraulic cylinder 340 is communicated with the oil tank 110. The piston rod of the hydraulic cylinder 340 drives the scissor mechanism 320 to perform the scissor motion, so that the platform 330 can be rapidly lifted or lowered, and the high-speed lowering requirement required by training can be met.
In order to avoid the system from losing pressure caused by the rupture of the hydraulic oil pipeline, which directly causes the platform 330 to stall and descend, endangering the life safety of the training personnel, the lifting mechanism 300 further comprises an explosion-proof valve 400, and the explosion-proof valve 400 is arranged on the pipeline between the rodless cavity of the hydraulic cylinder 340 and the A port 213. The explosion-proof valve 400 is generally installed near the hydraulic cylinder 340, and can perform a pressure maintaining function on the hydraulic cylinder 340 when the pipeline system loses pressure.
In order to further improve the safety of the system and prevent the oil pressure of the system from being too high, the high-altitude parachuting simulation hydraulic lifting system further comprises a safety valve 500, one end of the safety valve 500 is connected to a pipeline between the motor pump set 120 and the A port 213, and the other end of the safety valve 500 is connected to the oil tank 110. When the oil pressure value at the outlet of the motor pump unit 120 is higher than the set pressure value of the relief valve 500, the hydraulic oil returns to the oil tank 110 through the relief valve 500.
In addition, the high-altitude parachuting simulation hydraulic lifting system further comprises a one-way valve 900, wherein the one-way valve 900 is connected to a pipeline between the motor pump set 120 and the A port 213, and the one-way valve 900 and the safety valve 500 are connected in parallel with the motor pump set 120. The check valve 900 can prevent the reverse flow of hydraulic oil and damage the hydraulic components such as the motor pump set 120.
In order to meet the training requirement of high-altitude parachuting, the platform 330 is generally set to be high, so that the joints of the scissors mechanism 320 are relatively large, the friction resistance generated by the joints is also large, and the phenomena such as locking and the like are easy to occur. In order to solve the above problem, the hydraulic lifting system for high-altitude parachuting simulation further comprises a flow dividing and collecting valve 600, wherein the flow dividing and collecting valve 600 is provided with three oil ports, the number of the hydraulic cylinders 340 is two, one oil port of the flow dividing and collecting valve 600 is connected with the A port 213, the other two oil ports of the flow dividing and collecting valve 600 are connected with rodless cavities of the two hydraulic cylinders 340, and the explosion-proof valve 400 is positioned on a pipeline between the rodless cavities of the hydraulic cylinders 340 and the flow dividing and collecting valve 600. The two hydraulic cylinders 340 operate simultaneously, so that the possibility of the clamping of the scissor mechanism 320 can be reduced, and the pushing capacity and the pushing speed can be improved. The flow dividing and combining valve 600 can balance the flow of the two lifting cylinders so as to control the synchronous movement thereof.
In order to facilitate real-time observation of the system pressure, a pressure gauge 700 and a pressure sensor 800 are connected to the pipeline between the motor pump unit 120 and the check valve 900. The pressure sensor 800 can realize automatic control of the system, so that the system is more intelligent.
In order to simulate the wind speed and the wind quantity under different heights and environments when the high-altitude parachuting is performed, the high-altitude parachuting simulation hydraulic lifting system further comprises a fan 350 with an air outlet vertically upwards, the fan 350 is arranged at the bottom of the platform 330, and the bottom plate of the platform 330 is of a metal net structure.
In this embodiment, oil supply assembly 100 further includes oil return filter 130, oil supply filter 140, air filter 150, and level gauge 160.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (9)
1. The utility model provides a high altitude parachuting simulation hydraulic lifting system which characterized in that, it includes:
the oil supply assembly comprises an oil tank and a motor pump set;
the control assembly comprises a proportional reversing valve and an adjustable overflow valve, the proportional reversing valve is a three-position four-way valve, the proportional reversing valve is provided with a P port, a T port, an A port and a B port, the P port is connected with an oil outlet of the motor pump set, and the T port is connected with the oil tank; when the left station of the proportional reversing valve works, the port P is communicated with the port A, and the port B is communicated with the port T; when the middle station of the proportional reversing valve works, all oil ports are disconnected with each other; when the right station of the proportional reversing valve works, the port P is communicated with the port B, and the port A is communicated with the port T;
the oil inlet of the lifting mechanism and one end of the adjustable overflow valve are connected in parallel with the port A, the oil return port of the lifting mechanism and the other end of the adjustable overflow valve are connected in parallel with the oil tank, and the lifting mechanism can ascend or descend.
2. The high-altitude parachuting simulation hydraulic lifting system according to claim 1, wherein the lifting mechanism comprises a base, a shearing fork mechanism, a platform and a hydraulic cylinder, one end of the bottom of the shearing fork mechanism is hinged to the base, the other end of the bottom of the shearing fork mechanism is slidably connected with the base, one end of the top of the shearing fork mechanism is hinged to the platform, the other end of the top of the shearing fork mechanism is slidably connected with the platform, the hydraulic cylinder is connected with the shearing fork mechanism and drives the shearing fork mechanism to ascend or descend, a rodless cavity of the hydraulic cylinder is communicated with the port A, and a rod cavity of the hydraulic cylinder is communicated with the oil tank.
3. The high-altitude parachuting simulation hydraulic lifting system according to claim 2, wherein the lifting mechanism further comprises an explosion-proof valve, and the explosion-proof valve is installed on a pipeline between a rodless cavity of the hydraulic cylinder and the port a.
4. A high-altitude parachuting simulation hydraulic lifting system according to claim 3, further comprising a safety valve, wherein one end of the safety valve is connected to a pipeline between the motor pump group and the port a, and the other end of the safety valve is connected to the oil tank.
5. The high-altitude parachuting simulation hydraulic lifting system according to claim 4, further comprising a one-way valve connected to a pipeline between the motor pump group and the port a, wherein the one-way valve and the safety valve are connected in parallel with the motor pump group.
6. The high-altitude parachuting simulation hydraulic lifting system according to claim 5, further comprising a flow dividing and collecting valve, wherein the flow dividing and collecting valve is provided with three oil ports, the number of the hydraulic cylinders is two, one oil port of the flow dividing and collecting valve is connected with the port A, the other two oil ports of the flow dividing and collecting valve are connected with rodless cavities of the two hydraulic cylinders, and the explosion-proof valve is arranged on a pipeline between the rodless cavities of the hydraulic cylinders and the flow dividing and collecting valve.
7. The high-altitude parachuting simulation hydraulic lifting system according to claim 6, wherein a pressure gauge is connected to a pipeline between the motor pump group and the one-way valve.
8. The high-altitude parachuting simulation hydraulic lifting system according to claim 6, wherein a pressure sensor is connected to a pipeline between the motor pump group and the one-way valve.
9. The hydraulic lift system of claim 6, further comprising a fan with an air outlet facing vertically upwards, wherein the fan is mounted at the bottom of the platform, and wherein the bottom plate of the platform is a metal mesh structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508055.8A CN114715819B (en) | 2022-05-10 | 2022-05-10 | High-altitude parachuting simulation hydraulic lifting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210508055.8A CN114715819B (en) | 2022-05-10 | 2022-05-10 | High-altitude parachuting simulation hydraulic lifting system |
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| Publication Number | Publication Date |
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| CN114715819A CN114715819A (en) | 2022-07-08 |
| CN114715819B true CN114715819B (en) | 2023-06-23 |
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| CN202210508055.8A Active CN114715819B (en) | 2022-05-10 | 2022-05-10 | High-altitude parachuting simulation hydraulic lifting system |
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| RU87091U1 (en) * | 2009-05-21 | 2009-09-27 | Александр Иванович ЕВТУШЕНКО | Inertial Trainer |
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| CN114370437A (en) * | 2021-12-31 | 2022-04-19 | 杭叉集团股份有限公司 | Scissor-fork type aerial work platform lifting hydraulic control system |
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| US20220126972A1 (en) * | 2020-10-28 | 2022-04-28 | Naiad Maritime Group, Inc. | Marine Vessel Brake Assist And Stabilization System |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU87091U1 (en) * | 2009-05-21 | 2009-09-27 | Александр Иванович ЕВТУШЕНКО | Inertial Trainer |
| CN103692445A (en) * | 2013-12-08 | 2014-04-02 | 中国科学院合肥物质科学研究院 | Electro-hydraulic servo heavy load parallel connection platform control system for nuclear fusion device and control method thereof |
| CA3064401A1 (en) * | 2019-09-06 | 2021-03-06 | Zhejiang Dingli Machinery Co., Ltd. | Control valve, derricking cyclinder and working method thereof, aerial work platform |
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| CN213024904U (en) * | 2020-10-20 | 2021-04-20 | 成都纬航科技有限公司 | Multifunctional aerospace simulation experience device |
| CN216311096U (en) * | 2021-09-08 | 2022-04-15 | 合肥云艺化科技有限公司 | VR that takes safety belt simulation experience platform that falls |
| CN114198353A (en) * | 2021-12-31 | 2022-03-18 | 杭叉集团股份有限公司 | Scissor fork type aerial work platform hydraulic control system |
| CN114370437A (en) * | 2021-12-31 | 2022-04-19 | 杭叉集团股份有限公司 | Scissor-fork type aerial work platform lifting hydraulic control system |
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| CN114715819A (en) | 2022-07-08 |
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Denomination of invention: High altitude parachute simulation hydraulic lifting system Granted publication date: 20230623 Pledgee: Agricultural Bank of China Limited Shanghai Songjiang Sub-branch Pledgor: Shanghai shengkesisi Hydraulic Co.,Ltd. Registration number: Y2024980001578 |