Luffing mechanism load control device and method
By adopting a load control device including PVG series main valve and a variable width valve group in the dock wall operation vehicle, the shaking and shaking problems caused by excessive deflection of the long boom are solved, the stability and safety of the operation are achieved, and the efficiency of ship docking repair is improved.
Patent Information
- Application Number
- CN202411543281.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-03-14
AI Technical Summary
The prior art is difficult to effectively solve the shaking and shaking problems caused by excessive deflection in dock wall working vehicles, especially when the boom is rapidly descent, which leads to unstable operation and endangers the safety of the worker.
A load control device for a variable amplitude mechanism is adopted, including a boom, a variable amplitude oil cylinder, a variable amplitude valve group, a rotating column and a PVG series main valve. It is connected to the variable amplitude valve group through a PVG series main valve. Using the combination of CB series valves, DV series valves and S series valves, the rod cavity of the variable amplitude oil cylinder is always in an oily state to avoid the valve core imbalance caused by the oscillation of the boom.
It effectively eliminates the phenomenon of boom shaking and shaking, ensures the stability of the dock wall working vehicle during the amplitude change process, ensures the safety of operators, and improves the working efficiency of ship dock repairs.
Smart Images
Figure CN119612388A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of ship building and maintenance, and more particularly to a load control device and method for a luffing mechanism. Background Art
[0002] For a long time, manual work has hindered the improvement of shipbuilding and dock repair efficiency and the shortening of dock repair cycle. In shipbuilding and dock repair projects, rust removal and painting occupy a very important position. The efficiency and quality of rust removal and painting directly affect the quality and cycle of dock repair. In recent years, high-pressure water cleaning rust removal technology and high-pressure painting new process technology have been widely used in ship dock repair projects. Dock repair equipment has higher and higher requirements for operation safety, automation level, reduction of labor intensity of staff, and operation efficiency.
[0003] At present, the commonly used load control method for the boom boom mechanism of the dock wall operation vehicle is to use the CA / CB series valve and the NC series valve in combination to complete the boom boom raising and lowering operation conditions. The CA / CB series valve is used to adjust the pressure, and the NC series valve is used to adjust the flow of the pilot port. In the case of a short boom length (such as less than 20 meters), this method can be applied, but the scope of application is limited; in the case of a long boom length (such as more than 20 meters), it can be found that: under certain working conditions, the boom will shake and sway. At this time, no matter how the CA / CB series valve and the NC series valve are adjusted, as well as the electronic control program and the controller program are adjusted, the boom shaking and shaking problem cannot be solved. Even if the CA / CB series valve is replaced, the use of the MB series valve with a buffer function cannot solve the boom shaking and shaking problem. It can be found that if the boom is too long and has too much deflection, the vibration of the boom itself during the boom descent process will cause the valve core to vibrate, causing the valve core to be in an unbalanced state and vibrate. In extreme cases, the vibration of the boom and the vibration of the valve core will resonate, causing the boom to shake violently. This problem poses a great danger to the operators. Summary of the invention
[0004] In order to overcome the deficiencies of the prior art, the present invention provides a load control device and method for a variable amplitude mechanism, which has the advantage of more precise operation.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a load control device for a luffing mechanism, comprising: a boom, a luffing cylinder, a luffing valve group, a rotating column and a PVG series main valve, wherein the rotating column is fixed on a frame, and the frame and the mounting plane are fixed to each other; one end of the boom is rotatably connected to the side surface of the upper part of the rotating column, a luffing cylinder is rotatably installed on the side surface of the bottom of the rotating column, an output end of the luffing cylinder is rotatably connected to the lower part of the boom, the luffing valve group is installed at the root of the luffing cylinder and is connected to the luffing cylinder; a power station is arranged on the upper part of the frame, the PVG series main valve is installed in the power station, and the PVG series main valve is connected to the luffing valve group.
[0006] As a preferred technical solution of the present invention, the variable amplitude valve group includes a CB series valve, a DV series valve, and an S series valve. The CB series valve is communicated with the rodless chamber of the variable amplitude cylinder, the DV series valve is installed on the pilot port branch of the CB series valve, and the S series valve is installed on the return oil pipeline, and the S series valve is communicated with the rod chamber of the variable amplitude cylinder.
[0007] As a preferred technical solution of the present invention, the present invention also discloses a load control method of a variable amplitude mechanism, comprising the following steps:
[0008] Step 1: During the lowering process of the boom (1), the CB series valve does not participate in the control, and the pressure oil from the PVG series main valve is used to open the pilot pressure of the CB series valve;
[0009] Step 2: The DV series valve is used to supply oil to the luffing cylinder through the pressure-stabilizing S series valve at the pilot port, so that the rod chamber of the luffing cylinder is always filled with oil.
[0010] As a preferred technical solution of the present invention, the PVG series main valve is controlled by a remote electric control program to control the opening of its proportional solenoid.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention eliminates the boom shaking phenomenon caused by the oscillation of the valve core, which causes the valve core to be in an unbalanced state, due to the boom being too long and the deflection being too large, and the boom's own oscillation causing the oscillation of the valve core, resulting in the phenomenon of violent boom shaking caused by resonance between the oscillation of the boom and the oscillation of the valve core in extreme cases; the present invention ensures the stability of the dock wall working vehicle during the boom changing process, and ensures that the external load impact force does not damage the product, ensures the safety of the staff's operation, and greatly improves the work efficiency and operation safety of ship dock repair. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the structure of the present invention;
[0013] Figure 2This is a schematic diagram of the structure of the variable amplitude valve group of the present invention;
[0014] Figure 3 for Figure 1 Enlarged view of point A in the middle;
[0015] In the figure: 1. Boom; 2. Luffing cylinder; 3. Luffing valve group; 4. CB series valve; 5. DV series valve; 6. S series valve; 7. Rotary column; 8. PVG series main valve. DETAILED DESCRIPTION
[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0017] like Figures 1 to 3 As shown, the present invention provides a load control device for a luffing mechanism, comprising: a boom 1, a luffing cylinder 2, a luffing valve group 3, a rotating column 7 and a PVG series main valve 8, wherein the rotating column 7 is fixed on a frame, and the frame and the mounting plane are fixed to each other; one end of the boom 1 is rotatably connected to the side surface of the upper part of the rotating column 7, and the luffing cylinder 2 is rotatably installed on the side surface of the bottom of the rotating column 7, and the output end of the luffing cylinder 2 is rotatably connected to the lower part of the boom 1, and the luffing valve group 3 is installed at the root of the luffing cylinder 2 and connected to the luffing cylinder 2; a power station is arranged on the upper part of the frame, and the PVG series main valve 8 is installed in the power station, and the PVG series main valve 8 is connected to the luffing valve group 3.
[0018] Among them, the variable amplitude valve group 3 includes a CB series valve 4, a DV series valve 5, and an S series valve 6. The CB series valve 4 is communicated with the rodless chamber of the variable amplitude cylinder 2. The DV series valve 5 is installed on the pilot port branch of the CB series valve 4. The S series valve 6 is installed on the return oil pipeline, and the S series valve 6 is communicated with the rod chamber of the variable amplitude cylinder 2.
[0019] The present invention also discloses a load control method for a variable amplitude mechanism, comprising the following steps:
[0020] Step 1: During the lowering process of the boom 1, the CB series valve 4 does not participate in the control, and the pressure oil from the PVG series main valve 8 is used to open the pilot pressure of the CB series valve 4;
[0021] Step 2: The DV series valve 5 is used to control the pressure-stabilizing S series valve 6 at the pilot port to supply oil to the luffing cylinder 2, so that the rod chamber of the luffing cylinder 2 is always in an oil-filled state.
[0022] The PVG series main valve 8 is controlled by a remote electric control program to control the opening of its proportional solenoid.
[0023] The working principle and use process of the present invention:
[0024] In the traditional structure, when the length of the boom 1 is 50 meters, the length of the boom 1 is too long, and the boom 1 is in a cantilever state, with too much deflection. The force is the greatest in the range of 50° to 20°. At this time, the boom 1 is in the process of rapid descent. Since the acceleration is constantly changing, the vibration of the boom 1 itself will cause the vibration of the valve core, causing the valve core to be in an unbalanced state. If the CA / CB series valve is involved in the control, the pressure fluctuation caused by the vibration of the boom 1 itself will cause the pressure change of the CA / CB series valve. When the frequency cannot be matched, the valve core will vibrate, causing the boom 1 to shake. In extreme cases, the vibration of the boom 1 and the vibration of the valve core will resonate, causing the boom 1 to shake violently.
[0025] When the present invention is in use, during the process of the boom 1 descending, the CB series valve 4 is not involved in the control, the pressure oil from the PVG series main valve 8 is only used to open the pilot pressure of the CB series valve 4, the DV series valve 5 is used for stabilizing the pressure of the pilot port of the CB series valve 4, and the S series valve 6 is connected to the rod chamber of the variable-length oil cylinder 2, and is used to replenish the oil of the rod chamber of the variable-length oil cylinder 2, so that the rod chamber of the variable-length oil cylinder 2 is always in an oil-filled state. At this time, the single control will not be affected by the acceleration change and deflection change of the boom 1 at different angles. The opening of the proportional solenoid of the PVG series main valve 8 is accurately controlled by the electronic control program. According to the preset opening curve, the variable-length descending speed of the boom 1 can be accurately controlled. Even under the condition of rapid descent of the boom 1, the boom 1 can be steadily descended without shaking or swaying. After actual verification, this load control method is suitable for booms 1 of any length and can ensure the safety of the staff's operation.
[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A load control device for a variable amplitude mechanism, characterized in that: The invention comprises: a boom (1), a luffing oil cylinder (2), a luffing valve group (3), a rotating column (7) and a PVG series main valve (8); the rotating column (7) is fixed on a frame, and the frame and the mounting plane are fixed to each other; one end of the boom (1) is rotatably connected to the side surface of the upper part of the rotating column (7); the luffing oil cylinder (2) is rotatably mounted on the side surface of the bottom of the rotating column (7); the output end of the luffing oil cylinder (2) is rotatably connected to the lower part of the boom (1); the luffing valve group (3) is mounted at the root of the luffing oil cylinder (2) and is connected to the luffing oil cylinder (2); a power station is arranged on the upper part of the frame, the PVG series main valve (8) is mounted in the power station, and the PVG series main valve (8) is connected to the luffing valve group (3).
2. A load control device for a variable amplitude mechanism according to claim 1, characterized in that: The variable-length valve group (3) comprises a CB series valve (4), a DV series valve (5), and an S series valve (6); the CB series valve (4) is in communication with the rodless chamber of the variable-length oil cylinder (2); the DV series valve (5) is installed on the pilot port branch of the CB series valve (4); the S series valve (6) is installed on the oil return pipeline, and the S series valve (6) is in communication with the rod chamber of the variable-length oil cylinder (2).
3. A method for controlling load of a variable amplitude mechanism, characterized in that: The steps include: Step 1: During the boom lowering process, the CB series valve (4) does not participate in the control, and the pressure oil from the PVG series main valve (8) is used to open the pilot pressure of the CB series valve (4); Step 2: The DV series valve (5) is used to supply oil to the variable-luff cylinder (2) through the pressure-stabilizing S series valve (6) at the pilot port, so that the rod chamber of the variable-luff cylinder (2) is always in an oil-filled state.
4. A method for controlling load of a variable amplitude mechanism according to claim 3, characterized in that: The PVG series main valve (8) is controlled by a remote electric control program to control the opening of its proportional solenoid.