What is the difference between the inner column type single hydraulic pillar and the outer column ty

What is the difference between internal and external injection single hydraulic struts?

1) The working fluid of the externally injected single hydraulic pillar is emulsion, and the emulsion is discharged to the goaf when returning to the column. The working fluid of the internal injection single hydraulic pillar is hydraulic oil, and the hydraulic oil in the cylinder flows back to the inner cavity of the live column to form a closed cycle. sh09

2) The emulsion for the external injection single hydraulic pillar is supplied by the pumping station located in the roadway through the high-pressure hose and liquid injection Q, and the initial support force of the pillar is given, and the initial support force is guaranteed by the pressure of the pumping station. The internal injection type single hydraulic strut relies on the hand pump of the strut itself to obtain the initial support force, so the initial support force is determined according to the size of the operating force.

3) The external injection single hydraulic pillar is to rely on the self-weight of the living column and the return spring to lower the column. The internal injection type single hydraulic pillar only relies on the self-weight drop column.

4) When lifting the column, the internal injection single hydraulic pillar needs to be inlet and exhaust, and it is required to be equipped with a ventilation device. Outside bets are not required.

5) When the live column of the external injection single hydraulic pillar rises to a large height, it relies on the limiting device to limit the position. When the live column of the internal injection single hydraulic pillar rises to a large height, it depends on the amount of oil in the live column to limit the position.

6) All valves on the external injection single hydraulic pillar are installed together, which is convenient for underground replacement and uphole maintenance. The safety valve, check valve and unloading valve of the internal injection single hydraulic prop are installed in different positions and cannot be replaced in the downhole.

One is the internal injection pillar, which is characterized by its own pump and oil, and can quickly lift the column by shaking it with a hand crank when it is supported, and does not discharge the working fluid when lowering the column, which can better protect the working environment, and is easy to use, flexible in management, and simple in equipment. At present, there are mainly 90mm bore cylinders, from a total of 12 specifications of the injection type struts. Mountain 400 East 086 Middle 0537 Coal (ZMJT10).

The second is the outer column type pillar, which provides the working liquid by the pumping station and injects the pillar through the injection gun to raise it and erect it, which has the characteristics of fast support, labor-saving and large scope of application. At present, there are mainly 100mm bore cylinders, from a total of 13 specifications of external injection struts.

The outer column type single liquid beam slapping pillar is provided by the pumping station with working liquid and injected into the pillar through the liquid injection gun to raise it and erect, which has the characteristics of fast support speed, labor-saving, and large application range of mu slag code. At present, China Coal mainly has a 100mm bore and a total of 13 specifications of external injection pillars.

Model: Large height, small height, mm stroke, fast stroke, working resistance, ali04kn, working hydraulics, MPA base area, mm, weight (with or without liquid), kg

dw35 3500 2800 800 180 23 109 88/83

dw06 600 480 150 300 109 26/

1. Oil cylinder, there are two kinds of oil cylinders: hot-rolled pipe (quenched and tempered) and cold-drawn pipe, although the cold-drawn pipe is simple and smooth and beautiful on the surface, the hardness of the cold-drawn pipe will change after stretching, and the ability to bear pressure will also be reduced. This is not the case with hot-rolled pipes, where the length of the pipe is only how much material is required, the thickness of the pipe wall remains the same, and the capacity to bear the pressure is high.

Second, the inner wall of the cylinder, in order to reduce the corrosion of the single hydraulic pillar in the process of use, the production and manufacturing will choose to plating copper on the inner wall, its anti-corrosion ability depends on the thickness of the copper plating, check the thickness of the copper layer on the inner wall of the outer pillar type single hydraulic pillar, and basically understand the corrosion resistance and service life of the single hydraulic pillar.

Third, the live cylinder, in order to wear resistance, the outer wall of the live cylinder needs to be chrome-plated, and the monomer without chrome plating is easy to wear, bringing some incomplete factors Ali 02.

Fourth, it is to look at some small accessories of the outer pillar type single hydraulic pillar, such as the top cover, base, etc., whether the material, size and thickness of these accessories can meet the requirements is also a factor that affects whether the single hydraulic pillar is fully durable, and it should also be paid attention to when purchasing.

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For the working face that intends to use the outer column type single hydraulic pillar, the empty bi should be correctly selected according to the geological conditions and monitoring results of the working face. Only when the selection is appropriate, can we play the role of pillars and manage the roof well.

According to the production mode of the working face, the support plan, technical measures and safety operation procedures are prepared, and the implementation is carried out after approval by the competent department.

Establish a ledger based on the working face. Its content generally includes: the date, quantity, model, amount of damage, maintenance time and root number, pillar technical performance measurement data, etc.

Regardless of the new or old pillars, they must be inspected one by one before going down the well, and only those who pass can go down the well. In addition, the pillar should be protected during transportation to prevent collision, collision, smashing and pressing with other hard objects, resulting in accidental mechanical damage.

Conduct pre-job training for operators, and those who are qualified will take up their posts to avoid unlicensed operation.

1. The reliability of the single hydraulic pillar.

The pillar is no longer equipped with the arc weld that the process is difficult to guarantee on the column, and the strength and reliability of the column are also improved, and the hidden dangers of accidents such as roof rise caused by weld fracture are avoided, and the safety of the staff is ensured.

2. The extensiveness of the single hydraulic pillar.

The working stroke of the hydraulic pillar is large, which expands the scope of use, and can also reduce the specifications and varieties of the pillar, especially the single hydraulic pillar can still meet the large constant increase resistance drop distance, which is not only convenient to return to the column, but also improves the rate of the pillar, reduces the consumption of the pillar, and reduces the production cost.

3. The stability of the single hydraulic pillar of China Coal.

Due to the existence of internal leakage, the pillar is void and even causes the pillar to fall automatically and injure people. And all the sealing points of DWX type pillar are peripherals, which can be visually checked by the naked eye, once a branch L pillar I leaks 0 leakage 4, the pillar can be injected or replaced at any time, which ensures the safety and reliability of the roof support of the coal mining face. The single hydraulic bumper pillar has no piston and no arc weld, which simplifies the process of the pillar structure and improves the safety.

Its live column and cylinder are integral structure, with high strength and good stability, 4. The convenience of a single hydraulic pillar.

The single hydraulic pillar is to weld the column head of the three-purpose valve on the live column, when the live column is raised, the operator must rise with it, especially for the higher working face, the operator is very inconvenient and unsafe; The pillar three-purpose valve is located on the handle body, when the liquid is injected, the three-purpose valve will not rise with the elevation of the live column, which is convenient to operate, safe and reliable.

1.The inner pillar type single hydraulic pillar must meet the factory test requirements or maintenance quality standards before it can be used in the well. The new pillars that arrive at the mine must also pass the inspection and re-test before they can be used in the mine.

2.Check whether the mechanical and electrical parts of the emulsion pump are normal, whether the emulsion of the oil tank is enough, and whether the concentration is appropriate, and then start the emulsion pump, and only when the pump parts are running normally and the liquid supply pressure reaches the rated working pressure of the pumping station can the liquid be supplied to the working face.

3.After moving the pillar to the predetermined support location, the oil injection valve body is first flushed with the liquid injection device, and then the liquid injection device is inserted into the three-purpose valve and connected with a locking sleeve.

4.When the single hydraulic pillar of the inner pillar of China Coal is used, the column should be raised and lowered once (large stroke) to drain the air in the cylinder before it can be used normally. When the pillar in use, the live A column L l l high 0 volume 4 has been lower than the height of the small safe return column, it should be sprinkled back in time to avoid being pressed into a "dead column".

5.It is forbidden to violently smash the pillar with a hammer, pickaxe and other metal objects to avoid damaging the pillar. In case the pillar is pressed into a "Senliang Dead Pillar", it can only be taken out by the method of picking the top or undercover, and the stool posture does not allow cannon collapse, hammer smashing or hinge pulling.

6.In the process of support, it is not allowed to use the pillar handle body as the fulcrum of the jack, so as not to damage the pillar.

First of all, due to the technical principle and structural characteristics of the single hydraulic strut, the arc weld with weak strength is arranged on the column, and the quality of the arc weld is difficult to guarantee in the process, although the tensile strength of the equipment weld B 500MPa, the elongation δs 10% of the specific requirements, but how to detect the problem of dry in the production site has not been solved, thus often causing the failure of the weld, such as: column weld fracture, weld leakage, weld leakage and other phenomena cover rock, resulting in pillar failure or the occurrence of the top silver hole** Accident. Therefore, there are serious safety risks associated with the pillars.

At present, the single hydraulic pillar is welded on the live column with the column head of the three-purpose valve, and when the live column is raised, the operator must rise with it, especially for the higher working face, the operator is very inconvenient and unsafe; The three-purpose valve of the single hydraulic pillar for mining is located on the handle body, and when the liquid is injected, the three-purpose valve will not rise with the elevation of the live column, which is convenient to operate, safe and reliable. Each sealing point adopts seal compensation and sealing tensioning technology, which can effectively compensate when the seal is worn, and can still maintain tension when the top plate is pressed, which reduces the replacement rate of the seal and reduces the maintenance cost.

Here, I hope the above content can be helpful to everyone!

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Summary. Hello, glad to answer for you.

The advantages are as follows: (1) Simple structure. In addition to the three-purpose valve, the inner chamber of the strut has few parts (unlike the internal injection single hydraulic strut equipped with a hand pump and ventilation device, etc.), so it is easy to process and low cost.

2) Easy to maintain. Most of the general failures of the pillar occur on the three-purpose valve, after replacing a good three-purpose valve in the downhole, the pillar can be put into use, without the overall lifting of the well, so the possibility of failure of the parts is less (and the damage of any internal parts of the internal injection single hydraulic pillar requires the dismantling of the pillar lifting well, and the maintenance workload is large).

3) The column lifting speed is fast. Generally, the lifting speed of the external injection single hydraulic pillar is 70 80mm s. The higher the pressure of the pumping station, the higher the speed of the column (the internal injection type single hydraulic pillar is completed manually, and the lifting column stroke is generally only 20 30mm for each shake of the handle).

In the case of the same lifting stroke, the lifting speed of the external injection type is 4 to 5 times faster than that of the internal injection pillar.

Single hydraulic strut has advantages over wooden struts.

Hello, I am glad to answer for you, the advantages are as follows: (1) The structure is simple. In addition to the three-purpose valve, the inner chamber of the strut has few parts (unlike the internal injection single hydraulic strut equipped with a hand pump and ventilation device, etc.), so it is easy to process and low cost. 2) Easy to maintain.

After replacing a good three-purpose valve in the downhole, the pillar can be put into use without the overall lifting, so the possibility of failure of the parts is less (and the damage of any internal parts of the internal injection single hydraulic pillar requires the pillar to be lifted and dismantled, and the maintenance workload is large). 3) The column lifting speed is fast. Generally, the lifting speed of the external injection single hydraulic pillar is 70 80mm s.

The higher the pressure of the pumping station, the higher the speed of the column (the internal injection type single hydraulic pillar is completed manually, and the lifting column stroke is generally only 20 30mm for each shake of the handle). In the case of the same lifting column stroke, the lifting speed of the outer injection beam is 4 5 times faster than that of the inner injection pillar.

4) The working stroke is large, and the range of coal seam changes is large. The stroke of the external injection single column is not limited by the lead mill column of You Huisheng, and it can be designed to be larger, so as to adapt to the range of coal seam changes (the internal injection single column is small due to the manual operation of the lifting column, and each stroke is small, so the pillar stroke cannot be designed to be too large, otherwise it will affect the operation of workers).

5) Light weight. The external injection type single column has few parts, so it is light in weight. The difference in the mass of the internal and external injection single column of the same height is 3-5kg.

Hope it helps.

Dear, I am glad to answer for you: Advantages of single hydraulic pillar over wood pillar Answer: small size, high support height, reliable support and convenient maintenance, low comprehensive cost, single hydraulic pillar is suitable for coal seam inclination angle less than 25 degrees - 35 degrees of inclined coal seam mining face, the coal seam roof and bottom plate conditions are suitable for:

The bottom plate should not be too soft, and the depth of the pillar into the bottom plate does not deteriorate the integrity of the bottom plate, otherwise the base should be increased. When used in the soft coal mining face, protective measures should be taken on the surface of the live column coating to prevent collapse. When the pillar is used with the wooden top beam or as a point column, the top cover should be replaced with a column cap to avoid damage to the wooden beam.

It is combined with the hinged roof beam column of the matching metal group, and can be applied to any coal mining face with a coal seam inclination angle below 35°. According to the different oil supply methods and working media, the pillars are divided into external oil supply type (abbreviation"Outside betting") and internal oil supply type (abbreviated"Inside bet") two categories; According to the different working strokes of the pillars, the pillars can be divided into single telescopic and double telescopic pillars; According to the different materials used in the pillars, the pillars can be divided into steel pillars and light alloy pillars. Combined with the actual use, it is divided into external injection single hydraulic pillar, internal injection single hydraulic support column, and other types of pillars.