Hydraulic system for sectional movement of electrical train on fully mechanized coal mining face

Abstract

The utility model belongs to the technical field of coal mine transportation, and aims to solve the problems that an electrical train on a fully mechanized coal mining face is greatly influenced by the environment and is difficult to pull in the pulling process. According to the hydraulic system for sectional movement of the fully mechanized coal mining face electrical train, main stop valves are arranged on liquid inlet paths and liquid return paths in the middle of a pushing system and the middle of a bottom lifting system, and a main liquid inlet pipe and a main liquid return pipe of a main liquid supply valve set system are connected with a pump box; liquid inlet pipelines and liquid return pipelines of the pushing system and the bottom lifting system are connected with the main liquid supply valve group system; a pushing branch stop valve is arranged on a hydraulic branch where a pushing unit corresponding to a train section located between the main stop valve and the main liquid supply valve set system is located. And a bottom lifting branch stop valve is arranged on a hydraulic branch on which the bottom lifting unit corresponding to the train section between the main stop valve and the main liquid supply valve group system is positioned. The system can solve the problems that an electric train is difficult to pull and move and a runway moves reversely due to the fact that a roadway bottom plate is soft and the gradient is too large.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine transportation, and in particular relates to a hydraulic system for segmented movement of an electric train on a fully mechanized mining working face. Background Art

[0002] In most of the working faces currently being mined, the electric train includes a mobile substation, an emulsion pumping station, an intelligent control console and various switchgear. It is not only the power source and control center of the comprehensive mining working face, but also can provide power supply and necessary signal control for various equipment on the working face. It also transmits high-pressure emulsion to the hydraulic supports, single hydraulic supports and other equipment in the comprehensive mining working face that are operated by hydraulic transmission, thereby realizing the transmission of various components, and then realizing a series of actions such as roof support, top sliding, frame shifting, frame adjustment, and side protection, thereby playing an important role in maintaining the roof and coal side of the working face in dynamic mining. However, as the mining working face advances, the electric train also needs to move in the advancing direction. Due to the wide variety of equipment connected to the electric train,

[0003] Due to its heavy weight, daily pulling and moving are somewhat difficult, so the electric trains are connected through connecting rods and a special transport runway is set up for pulling and moving.

[0004] Under traditional methods, the movement of electric trains mainly relies on hydraulic transmission. By retracting the piston of the push cylinder installed on the train, the piston of the bottom lifting cylinder installed on the train is extended to raise the train body; then the piston of the push cylinder is extended through hydraulic transmission, and the train is pulled to move on the runway through the stretching of the cylinder.

[0005] This method is widely used in the current pulling and moving operations of electric trains in coal mines, but it has certain limitations due to the complex and changeable geological conditions of different fully mechanized mining working faces. For example, when the drift tunnel where the working face train is located is in an uphill section with a large slope, during the pulling process of the electric train, due to the heavy weight and long body of the train, the interaction force generated by the push cylinder when pulling the train and the train runway can easily cause the runway to be loosely fixed, and under the action of the force, the runway moves in the opposite direction of the goaf. At this time, the runway is often fixed by pulling with a winch wire rope at the front end of the train, but because the operating location of the winch is close to the moving train section, there is a great safety risk and extremely high requirements for the position of personnel. At the same time, it also increases the workload in terms of personnel allocation and equipment operation. Utility Model Content

[0006] In order to solve at least one of the above technical problems existing in the prior art, the utility model provides a hydraulic system for the segmented movement of an electric train in a fully mechanized mining working face.

[0007] The utility model adopts the following technical solution: a hydraulic system for the segmented movement of an electric train in a fully mechanized mining working face, comprising a pushing system, a bottom lifting system, a pump box and a total liquid supply valve group system; main line stop valves are provided on the liquid inlet and return paths in the middle of the pushing system and the middle of the bottom lifting system, and the train sections where the main line stop valves are provided in the two systems are consistent; the main liquid inlet pipe and the main liquid return pipe of the total liquid supply valve group system are connected to the pump box, and the liquid inlet pipelines and liquid return pipelines of the pushing system and the bottom lifting system are both connected to the total liquid supply valve group system;

[0008] The main hydraulic supply valve group system is arranged at the front of the train. Each train section corresponds to a push unit. A push branch stop valve is provided on the hydraulic branch where the push unit corresponding to the train section between the main stop valve and the main hydraulic supply valve group system is located. Multiple push units arranged in parallel constitute the push system.

[0009] Each train section corresponds to a bottom lifting unit. A bottom lifting branch stop valve is provided on the hydraulic branch line where the bottom lifting unit corresponding to the train section between the main line stop valve and the main liquid supply valve group system is located. Multiple bottom lifting units arranged in parallel constitute a bottom lifting system.

[0010] Preferably, the main stop valve, the push branch stop valve and the bottom lifting branch stop valve are all spherical stop valves with model KJ10.

[0011] Preferably, the number of main stop valves provided on the liquid inlet paths of the pushing system and the bottom lifting system is 1 each, and the number of main stop valves provided on the liquid return paths is 1 each.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This system can be adjusted to the actual layout of electric trains in different fully mechanized mining faces. By segmenting the fluid supply system, the trains form a segmented closed loop, facilitating pulling and moving operations. This can address the difficulties of electric train pulling and moving, as well as track reverse movement, caused by soft roadway floors and steep slopes during actual production. This reduces manpower and material resources, lowers worker labor intensity, and mitigates safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 Schematic diagram of the system structure of this embodiment;

[0016] Figure 2 Schematic diagram of the staged liquid supply state of this embodiment (the dotted box is the portion that receives liquid during the front-stage movement);

[0017] Figure 3 This is a schematic diagram of the state of the segmented liquid supply in this embodiment (the dotted box is the part that receives liquid during the latter stage of the movement).

[0018] In the figure: 1- pushing unit; 2- bottom lifting unit; 3- pump box; main liquid supply valve group system; 5- main line stop valve; 6- pushing branch stop valve; 7- bottom lifting branch stop valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the drawings 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 implementation methods obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0020] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by the present invention, should fall within the scope of the technical content disclosed by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0021] The utility model provides an embodiment:

[0022] like Figure 1 As shown, a hydraulic system for the segmented movement of an electric train in a fully mechanized mining working face includes a pushing system, a bottom lifting system, a pump box 3, and a total liquid supply valve group system 4; a total line stop valve 5 is provided on the liquid inlet and return paths in the middle of the pushing system and the middle of the bottom lifting system, and the train sections where the total line stop valve 5 is provided in the two systems are the same; the total liquid inlet pipe and the total liquid return pipe of the total liquid supply valve group system 4 are connected to the pump box 3, and the liquid inlet and return pipes of the pushing system and the bottom lifting system are both connected to the total liquid supply valve group system 4;

[0023] The main liquid supply valve group system 4 is arranged at the front of the train, and each train section corresponds to a pushing unit 1. A pushing branch stop valve 6 is provided on the hydraulic branch where the pushing unit 1 corresponding to the train section between the main stop valve 5 and the main liquid supply valve group system 4 is located, and a plurality of pushing units 1 arranged in parallel constitute a pushing system; each train section corresponds to a bottom lifting unit 2, and a bottom lifting branch stop valve 7 is provided on the hydraulic branch where the bottom lifting unit 2 corresponding to the train section between the main stop valve 5 and the main liquid supply valve group system 4 is located, and a plurality of bottom lifting units 2 arranged in parallel constitute a bottom lifting system.

[0024] In this embodiment, the main shutoff valve 5, the push branch shutoff valve 6, and the bottom lift branch shutoff valve 7 are all KJ10 spherical shutoff valves. There is one main shutoff valve 5 installed on the liquid inlet path of both the push system and the bottom lift system, and one main shutoff valve 5 installed on the liquid return path.

[0025] Taking the fluid supply system of the electric train with 26 cars on the working surface as an example, when the train is pulling and moving, the high-pressure emulsion flows into the main fluid supply valve group system through the main fluid inlet pipe of the pump station (model KJ32), and then flows in through their respective fluid inlet pipes (model KJ32) and flows out through the return fluid pipe (KJ32), forming a closed loop, and finally flows into the pump box through the main return fluid pipe.

[0026] Because there are three mobile substations and switchgear placed in front of the 11# train section of the train, which is heavy and can easily cause the runway to move in the opposite direction, two KJ10 ball stop valves are installed on the liquid inlet and return paths of the pushing cylinder and the bottom lifting cylinder of the 11# train section as the main stop valve 5, and KJ10 ball stop valves are installed in the pushing and bottom lifting systems of all train sections forward of the 11# train section as the pushing branch stop valve 6 and the bottom lifting branch stop valve 7.

[0027] When the train is being pulled, first close the valve core of the main stop valve 5 at A, B, C, and D in the figure, and extend the plunger of the bottom lifting cylinder and retract the plunger of the push cylinder. At this time, the pushing and lifting of the train sections (1#-10#) of the 11# train section toward the lane entrance form two closed fluid supply circuits (such as Figure 2 area within the red frame).

[0028] Remove the connecting rod between the 11# train section and the train in the adjacent goaf direction, then operate the pull rod to stretch the cylinder to move the electric train forward 0.6 meters and then stop stretching.

[0029] At this time, open the valve core of the main stop valve 5 at A, B, C, and D, and close E1E2E 3…… E 10 Push branch stop valve 6, F1F2F 3…… F 10The valve core of the bottom lifting branch stop valve 7 at the bottom lifting branch (the KJ10 ball stop valve set in the push and bottom lifting circuit in the train section has been pulled) makes the fluid supply system of the first half of the train section pulled through form an open circuit, and the remaining second half of the train section forms a fluid supply closed circuit (such as Figure 3 area within the red frame).

[0030] Then operate the pull rod to stretch the push cylinder to continue pulling the subsequent electric train. At this time, the train section on the right side of the 11# train section has a heavy weight, accounting for 70% of the total weight of the train, and plays the role of fixing the runway, so the runway will not move in the opposite direction when pulling the subsequent electric train.

[0031] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A hydraulic system for segmented movement of electric trains in fully mechanized mining working faces, characterized by: It includes a pushing system, a bottom lifting system, a pump box (3) and a total liquid supply valve group system (4); A main stop valve (5) is provided on the liquid inlet and liquid return paths in the middle of the pushing system and the middle of the bottom lifting system, and the train sections where the main stop valve (5) is provided in the two systems are consistent. The main liquid inlet pipe and the main liquid return pipe of the main liquid supply valve group system (4) are connected to the pump box (3), and the liquid inlet pipelines and liquid return pipelines of the pushing system and the bottom lifting system are both connected to the main liquid supply valve group system (4); A main liquid supply valve group system (4) is arranged at the front of the train, and each train section corresponds to a push unit (1). A push branch stop valve (6) is arranged on the hydraulic branch where the push unit (1) corresponding to the train section between the main stop valve (5) and the main liquid supply valve group system (4) is located. A plurality of push units (1) arranged in parallel form a push system. Each train section corresponds to a floor lifting unit (2); a floor lifting branch line stop valve (7) is provided on the hydraulic branch line where the floor lifting unit (2) corresponding to the train section is located between the main line stop valve (5) and the main liquid supply valve group system (4); and a plurality of floor lifting units (2) arranged in parallel form a floor lifting system.

2. A hydraulic system for segmented movement of electric trains in fully mechanized mining working faces according to claim 1, characterized in that: The main stop valve (5), the push branch stop valve (6) and the bottom lifting branch stop valve (7) are all spherical stop valves with a model of KJ10.

3. The hydraulic system for segmented movement of electric trains in fully mechanized mining working faces according to claim 1, characterized in that: The number of main stop valves (5) provided on the liquid inlet paths of the pushing system and the bottom lifting system is both one, and the number of main stop valves (5) provided on the liquid return paths is both one.

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