Lifting, the system layout of the hydraulic support lifting speed Wang Yong, Cao Tiesheng. Zhou Qun. Luo Yuenan, Zhang Guangjun, Han Titiandi Technology Co., Ltd., North, Abstract: Through the increase of the bracket lifting speed, mAr, the key adjustment of Wenzoo; system layout transfer time 1 in the classification number 4.4 document identification code is well known. The hydraulic support shifting time not only affects the Ding face advancement speed. At the same time, it seriously affects the effective treatment of the roof of the working face.
It is a vital influence for high-efficiency intensive coal mining face. The bracket realizes one shifting period. Its action consists of three parts to reduce the frame pull frame. Different brackets on different work surfaces. The effects of different factors such as operation. The consumption of these three parts of the action reaches 221. If the shifting time is divided according to the actuator, the action time of the partial pull frame is completed by the shift jack and the action time of the lift frame is completed by the column. It can be found that the time of the lifting frame accounts for 60 of the shifting time. If this part of time is compressed, the space of the whole system design will be greatly expanded. 1 The conventional hydraulic system is designed to flow through the emulsion during the lifting process of the column.
01 conventional hydraulic killing original buried 1 column 2 control valve; 3 hydraulic control valve lift high pressure emulsion hose control valve hose hydraulic control check valve column lower chamber, liquid emulsion column upper chamber plastic diaphragm control valve hose drop height Le emulsion hose control valve hose column upper chamber ten liquid emulsion column lower chamber liquid control one-way valve hose control valve hose in the process of lifting frame system pressure drop should meet the following balance formula to overcome the load force; heart for the system The pressure is the area of ​​the upper cavity of the lower column of the column; the households of 2 households 2, 2 households 3, habitually. 1.2 corpse 3 is referred to as inlet resistance loss.
2 corpse 2.2 is known as the ton night bamboo pressure. Theoretically, the flow of fluid through a link such as the first pressure drop and the speed of the column action are the flow system and the index. Relevant information related to the form and parameters of the link, the statistical data of the trial and the statistics, the mouth, and the form of the bad section. 1 this. At a load of 77 liters. In the case of the household, the parameters of the heart and the heart are related to the design of the bracket. The conventional design method can only improve the parameters of the link to reduce the flow of the system to improve the speed of the column. The measures taken by the main officials increase the pipeline diameter. Shorten the length of the pipeline, reduce the loss of resistance along the system; increase the rated flow of the valve, reduce the local loss coefficient; improve the pipeline auxiliary parts, mainly in the form of various joints, to reduce the resistance loss by reducing the flow coefficient.
Increase system pressure and increase the amount of resistance loss allowed in each link to increase flow and speed.
Yes, a conventional hydraulic system arrangement is used. To achieve the purpose of increasing the speed of lifting. The design work is to change the system receiving date 20006, 4 author brief introduction Wang Yong 1966. Jiangsu Jiangdu people, grade workers, Yang Nianzhong University of Science and Technology, Department of Mechanical Engineering, Master of Arts, is now engaged in hydraulic real, component development research.
The parameters of each link 14. Before the development of the domestic liquid 1 bracket all liquid 1 components is mainly for the liquid of the ordinary stent; the system design, the potential of all its components can not meet the high productivity and efficient work face fast frame Requirements. My technical background of the most advanced rapid-moving system is the national research project. However, it is used for a long working face of 3 (1) m and a large depth of 100, and the above-mentioned overweight support 201 is also insufficient. In order to solve this problem, in addition to accelerating the development of the liquid flow of the fire flow, the speed requirement of the liquid system can be arranged by designing a new liquid system.
2 Two improved hydraulic system design principles The support reduction of the gantry should be small, even less than zero. During the lowering of the column, the upper surface of the towel 1 is small. The required flow is also small. According to the analysis, the loss of the inlet resistance is negligible in Equation 2. That is, the key to increasing the speed of the drop is to reduce the back pressure of the liquid. 24. The flow of the column is the control valve of the lower chamber. Hose 1 manipulates the valve hose 2. The pilot operated check valve is non-portable. It seems that the liquid return can be removed after being manipulated. If the hose 1 can be connected to the liquid returning small pipe, it can be connected. Then the liquid return reduces the resistance loss of the two links. Court 2, Pavilion 3 lists two implementation methods that can achieve this idea.
The operation of the liquid supply to the lower chamber of the column is to control the valve rubber to alternately slam the valve to the lower chamber of the one-way valve column; the lower chamber of the column is in the process of returning the liquid to the lower chamber of the column, and the one-way alternate one-way valve hose is called the liquid pipe.
From the perspective of valve design. Also improve the rogue. Theoretically, the resistance loss of an alternate check valve is equivalent to one pass. The control valve is restricted by various factors. Increasing the flow is a limit to remember. Turning the flow rate of the operating valve into one flow of one-way check valve will have a multiplier effect.
2.2 Design method of double check valve 3 control valve to the lower chamber of the column to supply the liquid process to operate the valve hose check valve lower column lower chamber; column lower chamber liquid return process foot column lower chamber hydraulic control check valve hose back to liquid bamboo.
In principle, the system is arranged in the lower chamber of the column, and the liquid flow is better than that of the Xiao system. The liquid does not need to be manipulated or exchanged in one direction, completely removing one ring riser, and the liquid does not pass through the liquid control list. Instead, it passes through a towel and enters the lower chamber of the column. The flow rate of the check valve can be much larger than the hydraulic control and the valve, so the lifting resistance can be reduced. Lift the rack speed.
At the same time, the liquid in the lower chamber of the column passes through two completely different tubes, and the structure is asymmetrical. Therefore, the resistance loss of the incoming liquid is also different. 3 schemes require only one direction of flow, and there is no requirement for reverse flow. The difficulty of designing such a valve is much lower than that of the two-way flow. The disadvantage of the winter 3 scheme is that there are 7 more than one one-way. The valve is placed in the high pressure seal of the lower chamber of the column. Flash and seal reliability is lower than the first two. The specific degree of influence is related to the structure of the swaying valve. The front sealing valve of the front check valve is often used in China. Reliability is more versatile, can meet the needs, and has no impact on the overall reliability of the system.
3 effect analysis The improved scheme theoretically will short-circuit the liquid without passing through the valve. The valves that affect the system flow test are only hydraulically controlled. in. To the valve. If the flow rate of the control valve and the flow anvil of the hydraulic control check valve reach the ideal 2, then the resistance loss of the liquid flowing through the control valve and the hydraulic control check valve is the same. The resistance loss of the hydraulic control check valve is allowed to be = the corpse control 笮 underfire 2, which is the flashing of the hydraulic control check valve under the premise of allowing the resistance loss. The theoretically improved system is compared with the original system. The flow rate equivalent to the pilot operated check valve and the control valve is increased by 4 for this purpose. Correct. 32,1 2 type brackets made 3 kinds of schemes. The technical parameters of the brackets are as follows: column cylinder diameter piston rod diameter 25, 12301 control flow rate 125 core 1 hydraulic control check valve flow rate 80; Know (1); alternating check valve flow like! One-way flow 80 mountain 1 test results as 1.
Test system test times, average total time, regular lifting time, system down time, improved lifting time, system 1, down time, improved lifting time, system 2, down time, improved system, lifting time, and alternate check valves used in the new system. In relation to the flow rate of the check valve, the system 1 needs to pass through an alternate one-way valve during the lifting process, so the lifting time 3.440 is longer than the conventional system 3.9; the improved system 2 uses the one-way valve flow and liquid. The control check valve flow is the same 8.7, large and lift, the similar are 3.1 and 3.063 respectively; the improved system 12 is down, the liquid return + after the manipulation 1 spider has obvious improvement compared with the conventional system, down frame, between From 6.338 to 5.158 and 5.218; since the alternating check valve flow is very high to 40017, the improved system 2 is not significantly different from the improved system 1 in terms of downshift operation, but should be improved in terms of lifting, and by design For one-way valves with large flow rates, the lifting time should be improved and shortened.
4 Conclusions Before the huge 1 China's flow from the big operation, look at the é”, 350, use it instead of the special operating valve. The other links of the system remain unchanged. The test measures the stand lift time to about 88, which is close to improving the lift time of the system 12, and the effect is basically the same.
The test results and theoretical analysis show that, without changing the technical parameters of the system components, the system layout is adjusted, and the system performance will be significantly improved. At present, the main hydraulic component control valve and the hydraulic control check valve of the bracket are increased to 1.4 times of the maximum flow rate of the existing related products, and there must be a major breakthrough in the technical aspect, and the valve is improved according to the requirements of the coal mining process for the hydraulic system of the support. The flow rate is not allowed in the product trial cycle, but it is a good strategy to improve the system layout.
Responsible editor Mao Debing was connected to the 67-page factor. 1 The relationship between the parties was adjusted, and the rapid development of the local economy was promoted. Technical workers such as electromechanical installations also transformed the farmers in the subsidence area from traditional extensive agricultural production to intensive production. The fresh water was collected from the workers in the mining area and the surrounding people. The seedlings produced were used to beautify the mines and rural areas. , = 2.3 is insufficient. At present, the area of ​​the subsidized area that has been treated by Xinji Mine is not large, accounting for only about 24 of the entire area. The governance needs to be improved and the land reclamation work has not yet been carried out. At present, the only work that has been done is to make full use of land and water surface development work, and comprehensive management is still waiting for deep development. That is to say, the new eco-agricultural economy is rolled up.
Insufficient comprehensive management techniques in the subsidence area have restricted the depth of governance in the subsidence area.
Insufficient investment is limited to the whole and he intends to fall into the district governance fund, and according to the current financial system, there is no such expenditure. There is no source of funding. It is recommended that the new mines be deducted and funded.
Multi-party accumulation of funds. And strive to help the government's funds to help the subsidy area governance organization to guide + improve the new collection mine has not yet established a complete collapse area governance organization. The current governance work is the responsibility of the land department and the testing department. The cadres have a wide range of responsibilities and large transactional work, so the management is not strong enough. Coupled with no assessment indicators, the management staff has no pressure, and the actual management is not in place.
6 The greening and beautification work of the new mining subsidence area has not yet been carried out, and it is still necessary to do a good job in this aspect.
Responsible Editor, Literature Wide Coal Mining, Chen Peipei, Translated by Hu Bingnan
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