Roof support hydraulic system and coal mining machine

Abstract

The utility model relates to the technical field of mine supporting equipment, and provides a roof supporting hydraulic system and a coal mining machine. The top plate supporting hydraulic system comprises an oil source, a balance valve and a plurality of top protection plate oil cylinders. And each top guard plate oil cylinder is connected with a corresponding top guard plate in the coal mining machine. And rod cavities of the top guard plate oil cylinders are communicated with one another. And rodless cavities of the top guard plate oil cylinders are communicated with one another. The oil source is connected with rod cavities and rodless cavities of all the top guard plate oil cylinders through a main oil supply and return path so as to supply oil to all the top guard plate oil cylinders or return oil to all the top guard plate oil cylinders. And the balance valve is mounted on the main oil supply and return path. Through the structural arrangement, the balance valve is arranged on the main oil supply and return path, so that a plurality of top guard plate oil cylinders share the same balance valve, and the cost can be reduced. And meanwhile, the balance valve and the top guard plate oil cylinder are separately and independently arranged, so that the processing requirements of the balance valve and the top guard plate oil cylinder can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mine support equipment, in particular to a roof support hydraulic system and a coal mining machine. Background Art

[0002] The top guard plate is an important component of the coal mining machine, which is used to prevent the impact damage to the coal mining machine caused by falling coal or other heavy objects. At present, a hydraulic system is usually used to drive and adjust the state of the top guard plate. In the existing hydraulic system, the oil cylinder and the balance valve used to drive the action of the top guard plate are usually an integrated structure, which has high requirements for the processing of the joint surface between the oil cylinder and the balance valve, and each oil cylinder in the hydraulic system needs to be independently equipped with a balance valve, which is also relatively costly. Utility Model Content

[0003] The utility model provides a roof support hydraulic system and a coal mining machine, which are used to solve or improve the problem that in the prior art, the oil cylinder and the balance valve are usually an integrated structure, which has high requirements on the processing of the joint surface between the oil cylinder and the balance valve, and each oil cylinder in the hydraulic system needs to be independently equipped with a balance valve, which has a relatively high cost.

[0004] According to a first aspect of the utility model, a roof support hydraulic system is provided, comprising:

[0005] A plurality of top guard plate oil cylinders, each of which is connected to a corresponding top guard plate in the coal mining machine, the rod chambers of each of which are interconnected, and the rodless chambers of each of which are interconnected;

[0006] An oil source, the oil source being connected to the rod chamber and the rodless chamber of each of the top guard plate oil cylinders through a main supply and return oil path to supply oil to each of the top guard plate oil cylinders or to return oil to each of the top guard plate oil cylinders;

[0007] A balancing valve is installed on the main oil supply and return line.

[0008] According to a roof support hydraulic system provided by the utility model, the main supply and return oil circuit includes a first oil circuit and a second oil circuit. The oil source is connected to the rod chamber of each of the roof guard plate oil cylinders through the first oil circuit. The oil source is connected to the rodless chamber of each of the roof guard plate oil cylinders through the second oil circuit.

[0009] According to a roof support hydraulic system provided by the utility model, the oil source includes an oil pump and a supply and return oil tank. The roof support hydraulic system also includes a directional control valve. The oil pump and the supply and return oil tank are connected to the directional control valve. The directional control valve is connected to the first oil circuit and the second oil circuit. The directional control valve is used to control the connection state between the oil pump and the supply and return oil tank and the first oil circuit and the second oil circuit.

[0010] According to a roof support hydraulic system provided by the utility model, the directional control valve is provided with an extended position and a retracted position.

[0011] In the extended position, the oil pump is connected to the second oil circuit through the directional control valve, and the supply and return oil tank is connected to the first oil circuit through the directional control valve; in the retracted position, the oil pump is connected to the first oil circuit through the directional control valve, and the supply and return oil tank is connected to the second oil circuit through the directional control valve.

[0012] According to the roof support hydraulic system provided by the utility model, the directional control valve is further provided with a cut-off position. In the state of the cut-off position, the oil pump and the oil supply and return tank are cut off from the first oil circuit and the second oil circuit through the directional control valve.

[0013] According to a roof support hydraulic system provided by the utility model, the roof support hydraulic system further comprises a jet pump and an oil replenishment tank. The oil replenishment tank is connected to the supply and return oil tank through the jet pump. A stop valve is also provided between the jet pump and the second oil circuit.

[0014] According to a roof support hydraulic system provided by the utility model, a filter is arranged between the jet pump and the oil replenishment tank.

[0015] According to a roof support hydraulic system provided by the utility model, both the first oil circuit and the second oil circuit are provided with a one-way throttle valve.

[0016] According to a roof support hydraulic system provided by the utility model, an atmospheric safety valve is arranged on the second oil circuit.

[0017] According to a second aspect of the utility model, there is provided a working machine, comprising a plurality of top guard plates and the top guard plate supporting hydraulic system as described above, wherein the top guard plates are connected to the top guard plate cylinders in a one-to-one correspondence.

[0018] The roof support hydraulic system provided by the utility model includes an oil source, a balance valve and a plurality of roof guard plate cylinders. Each roof guard plate cylinder is connected to a corresponding roof guard plate in the coal mining machine. The rod chambers of each roof guard plate cylinder are interconnected, and the rodless chambers of each roof guard plate cylinder are interconnected. The oil source is connected to the rod chamber and the rodless chamber of each roof guard plate cylinder through the main supply and return oil line to supply oil to each roof guard plate cylinder or to return oil to each roof guard plate cylinder. The balance valve is installed on the main supply and return oil line. During operation, when the oil source supplies oil to the rodless chamber of each roof guard plate cylinder through the main supply and return oil line, and the rod chamber of each roof guard plate cylinder returns oil to the oil source through the main supply and return oil line, the piston rod of each roof guard plate cylinder moves along the extension direction to adjust the state of the top guard plate. When the oil source supplies oil to the rod chamber of each top guard plate cylinder through the main supply and return oil circuit and the rodless chamber of each top guard plate cylinder returns oil to the oil source through the main supply and return oil circuit, the piston rod of each top guard plate cylinder moves along the contraction direction to adjust the state of the top guard plate.

[0019] By means of this structural setting, the balancing valve is arranged on the main oil supply and return line, so that multiple top guard plate oil cylinders share the same balancing valve, which can reduce costs. At the same time, the balancing valve and the top guard plate oil cylinder are arranged separately and independently, which can reduce the processing requirements of the balancing valve and the top guard plate oil cylinder.

[0020] Furthermore, in the operating machine provided by the present invention, since it includes the roof support hydraulic system as described above, it also has the advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a system principle diagram of the roof support hydraulic system provided by the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the jet pump in the roof support hydraulic system provided by the utility model;

[0024] Reference numerals:

[0025] 100, top guard plate cylinder; 200, top guard plate; 310, oil pump; 320, supply and return oil tank; 410, first oil circuit; 420, second oil circuit; 500, balance valve; 600, directional control valve; 710, jet pump; 720, oil replenishment tank; 730, stop valve; 740, filter; 800, one-way throttle valve; 900, atmospheric safety valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] In the description of the embodiments of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] Combine the following Figure 1 and Figure 2 A roof support hydraulic system and a coal mining machine provided by the utility model are described. It should be understood that the following description is only an illustrative embodiment of the utility model and does not constitute any particular limitation to the utility model.

[0032] The embodiment of the first aspect of the utility model provides a roof support hydraulic system, such as Figure 1 As shown, the roof support hydraulic system includes:

[0033] A plurality of top guard plate oil cylinders 100, each of which is connected to a corresponding top guard plate 200 in the coal mining machine, the rod chambers of each top guard plate oil cylinder 100 are interconnected, and the rodless chambers of each top guard plate oil cylinder 100 are interconnected;

[0034] An oil source, the oil source is connected to the rod chamber and the rodless chamber of each top guard plate oil cylinder 100 through a main oil supply and return line to supply oil to each top guard plate oil cylinder 100 or to return oil to each top guard plate oil cylinder 100;

[0035] The balancing valve 500 is installed on the main oil supply and return line.

[0036] The roof support hydraulic system provided by the utility model includes an oil source, a balance valve 500 and a plurality of roof guard plate cylinders 100. Each roof guard plate cylinder 100 is connected to the corresponding roof guard plate 200 in the coal mining machine. The rod chambers of each roof guard plate cylinder 100 are interconnected, and the rodless chambers of each roof guard plate cylinder 100 are interconnected. The oil source is connected to the rod chamber and the rodless chamber of each roof guard plate cylinder 100 through the main supply and return oil line to supply oil to each roof guard plate cylinder 100 or return oil to each roof guard plate cylinder 100. The balance valve 500 is installed on the main supply and return oil line. During operation, when the oil source supplies oil to the rodless chamber of each roof guard plate cylinder 100 through the main supply and return oil line, and the rod chamber of each roof guard plate cylinder 100 returns oil to the oil source through the main supply and return oil line, the piston rod of each roof guard plate cylinder 100 moves along the extension direction to adjust the state of the roof guard plate 200. When the oil source supplies oil to the rod chamber of each top guard plate cylinder 100 through the main supply and return oil circuit and the rodless chamber of each top guard plate cylinder 100 returns oil to the oil source through the main supply and return oil circuit, the piston rod of each top guard plate cylinder 100 moves along the contraction direction to adjust the state of the top guard plate 200.

[0037] By setting the balance valve 500 on the main oil supply and return line, multiple top guard plate oil cylinders 100 can share the same balance valve 500, which can reduce costs. At the same time, the balance valve 500 and the top guard plate oil cylinder 100 are set separately and independently, which can reduce the processing requirements of the balance valve 500 and the top guard plate oil cylinder 100.

[0038] In one embodiment of the utility model, the main supply and return oil circuit includes a first oil circuit 410 and a second oil circuit 420. The oil source is connected to the rod chamber of each top guard plate oil cylinder 100 through the first oil circuit 410. The oil source is connected to the rodless chamber of each top guard plate oil cylinder 100 through the second oil circuit 420.

[0039] In one embodiment of the utility model, the oil source includes an oil pump 310 and a supply and return oil tank 320. The roof support hydraulic system also includes a directional control valve 600. The oil pump 310 and the supply and return oil tank 320 are connected to the directional control valve 600. The directional control valve 600 is connected to the first oil circuit 410 and the second oil circuit 420. The directional control valve 600 is used to control the communication state between the oil pump 310 and the supply and return oil tank 320 and the first oil circuit 410 and the second oil circuit 420.

[0040] In one embodiment of the present invention, the directional control valve 600 is provided with an extended position and a retracted position.

[0041] When in the extended position, the oil pump 310 is connected to the second oil circuit 420 through the directional control valve 600, and the return oil tank 320 is connected to the first oil circuit 410 through the directional control valve 600; when in the retracted position, the oil pump 310 is connected to the first oil circuit 410 through the directional control valve 600, and the return oil tank 320 is connected to the second oil circuit 420 through the directional control valve 600.

[0042] Furthermore, in one embodiment of the present invention, the directional control valve 600 is further provided with a cut-off position. In the cut-off position, the oil pump 310 and the oil supply and return tank 320 are cut off from the first oil circuit 410 and the second oil circuit 420 through the directional control valve 600.

[0043] Specifically, if Figure 1 As shown, in this embodiment, the roof support hydraulic system includes two roof guard plate cylinders 100. The rod chambers of the two roof guard plate cylinders 100 are interconnected and connected to the direction control valve 600 through the first oil circuit 410. The rodless chambers of the two roof guard plate cylinders 100 are interconnected and connected to the direction control valve 600 through the second oil circuit 420. The direction control valve 600 is connected to the supply and return oil tank 320 and the oil pump 310.

[0044] For example, the directional control valve 600 may be a three-position four-way reversing valve, which is provided with an extending position, a retracting position, and a cut-off position. When each top guard plate oil cylinder 100 is required to extend, the directional control valve 600 is switched to the extending position. At this time, the oil pump 310 is connected to the second oil circuit 420 through the directional control valve 600 to supply pressure oil to the rodless chamber of each top guard plate oil cylinder 100. At the same time, the first oil circuit 410 is connected to the supply and return oil tank 320 through the directional control valve 600 to allow the oil in the rod chamber of each top guard plate oil cylinder 100 to flow back to the supply and return oil tank 320.

[0045] When each top guard plate cylinder 100 is required to perform a contraction action, the directional control valve 600 is switched to the contraction position. At this time, the oil pump 310 is connected to the first oil circuit 410 through the directional control valve 600 to supply pressurized oil to the rod chamber of each top guard plate cylinder 100. At the same time, the second oil circuit 420 is connected to the supply and return oil tank 320 through the directional control valve 600 to allow the oil in the rodless chamber of each top guard plate cylinder 100 to flow back to the supply and return oil tank 320.

[0046] When the entire hydraulic system is in a stopped state, or after the piston rod of each top guard plate 200 hydraulic cylinder moves to the target position, the directional control valve 600 is switched to the cut-off position. At this time, the rod chamber and the rodless chamber of each top guard plate cylinder 100 are cut off from the oil pump 310 and the return oil tank 320, so that the piston rod of each top guard plate cylinder 100 remains in the current state.

[0047] It should be noted here that the above-mentioned balancing valve 500 is substantially a balancing valve group, which includes two balancing valves arranged on the first oil circuit 410 and the second oil circuit 420 .

[0048] In another embodiment of the present invention, Figure 1 and Figure 2 As shown, the roof support hydraulic system further includes a jet pump 710 and an oil replenishment tank 720. The oil replenishment tank 720 is connected to the supply and return oil tank 320 through the jet pump 710. A stop valve 730 is also provided between the jet pump 710 and the second oil circuit 420.

[0049] like Figure 2 As shown, the jet pump 710 includes an oil port A, an oil port B and an oil port C. Among them, the oil port C of the jet pump 710 is connected to the replenishing oil tank 720, and the oil port B of the jet pump 710 is connected to the supply and return oil tank 320. The oil port C of the jet pump 710 is connected to the second oil circuit 420, and a stop valve 730 is arranged between the oil port C of the jet pump 710 and the second oil circuit 420. When the oil tank in the supply and return oil tank 320 is less or the oil is exhausted, the stop valve 730 is opened to allow the oil in the replenishing oil tank 720 to be supplemented to the supply and return oil tank 320. In addition, a liquid level sensor can be arranged in the supply and return oil tank 320, and a remote control device can be arranged in the hydraulic system. The remote control device is connected to the liquid level sensor and the stop valve 730, and the remote control device can control the working state of the stop valve 730 based on the detection result of the liquid level sensor. For example, when the liquid level detected by the liquid level sensor is lower than a preset liquid level value, the remote control device controls the stop valve 730 to open to implement the oil replenishment operation.

[0050] In one embodiment of the present invention, Figure 1 As shown, a filter 740 is provided between the jet pump 710 and the oil replenishment tank 720. Thus, the cleanliness of the oil in the oil supply return tank 320 can be ensured.

[0051] In one embodiment of the present invention, Figure 1 As shown, one-way throttle valves 800 are disposed on the first oil circuit 410 and the second oil circuit 420 .

[0052] Further, in one embodiment of the utility model, an atmospheric safety valve 900 is provided on the second oil circuit 420. When the top guard plate oil cylinder 100 encounters a sudden drop of coal stone, the atmospheric safety valve 900 can directly open and release the pressure instantly to ensure the safety of the top guard plate oil cylinder 100, the oil circuit pipeline and the balance valve 500.

[0053] The second embodiment of the utility model provides a coal mining machine, comprising a plurality of top guard plates 200 and the top plate supporting hydraulic system as described above. The top guard plates 200 are connected to the top guard plate cylinders 100 in a one-to-one correspondence.

[0054] In the coal mining machine provided by the utility model, since it includes the roof support hydraulic system as described above, it also has the advantages as described above.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A roof support hydraulic system, characterized in that: include: A plurality of top guard plate oil cylinders (100), each of the top guard plate oil cylinders (100) being connected to a corresponding top guard plate (200) in the coal mining machine, the rod chambers of each of the top guard plate oil cylinders (100) being interconnected, and the rodless chambers of each of the top guard plate oil cylinders (100) being interconnected; An oil source, the oil source being connected to the rod chamber and the rodless chamber of each of the top guard plate oil cylinders (100) through a main oil supply and return path, so as to supply oil to each of the top guard plate oil cylinders (100) or to return oil to each of the top guard plate oil cylinders (100); A balancing valve (500) is installed on the main oil supply and return line.

2. The roof support hydraulic system according to claim 1, characterized in that: The main supply and return oil circuit includes a first oil circuit (410) and a second oil circuit (420); the oil source is connected to the rod chamber of each top guard plate cylinder (100) through the first oil circuit (410); and the oil source is connected to the rodless chamber of each top guard plate cylinder (100) through the second oil circuit (420).

3. The roof support hydraulic system according to claim 2, characterized in that: The oil source comprises an oil pump (310) and an oil supply and return tank (320), and the roof support hydraulic system further comprises a directional control valve (600). The oil pump (310) and the oil supply and return tank (320) are connected to the directional control valve (600), and the directional control valve (600) is connected to the first oil circuit (410) and the second oil circuit (420). The directional control valve (600) is used to control the connection state between the oil pump (310) and the oil supply and return tank (320) and the first oil circuit (410) and the second oil circuit (420).

4. The roof support hydraulic system according to claim 3, characterized in that: The directional control valve (600) is provided with an extended position and a retracted position. In the extended position, the oil pump (310) is connected to the second oil circuit (420) through the directional control valve (600), and the oil supply and return tank (320) is connected to the first oil circuit (410) through the directional control valve (600); in the retracted position, the oil pump (310) is connected to the first oil circuit (410) through the directional control valve (600), and the oil supply and return tank (320) is connected to the second oil circuit (420) through the directional control valve (600).

5. The roof support hydraulic system according to claim 4, characterized in that: The directional control valve (600) is also provided with a cut-off position. In the state of the cut-off position, the oil pump (310) and the oil supply and return tank (320) are cut off from the first oil circuit (410) and the second oil circuit (420) through the directional control valve (600).

6. The roof support hydraulic system according to claim 3, characterized in that: The roof support hydraulic system further comprises a jet pump (710) and an oil replenishment tank (720); the oil replenishment tank (720) is connected to the oil supply and return tank (320) via the jet pump (710); and a stop valve (730) is further provided between the jet pump (710) and the second oil circuit (420).

7. The roof support hydraulic system according to claim 6, characterized in that: A filter (740) is provided between the jet pump (710) and the oil replenishment tank (720).

8. The roof support hydraulic system according to any one of claims 2 to 7, characterized in that: One-way throttle valves (800) are provided on both the first oil circuit (410) and the second oil circuit (420).

9. The roof support hydraulic system according to any one of claims 2 to 7, characterized in that: The second oil circuit (420) is provided with an atmospheric safety valve (900).

10. A coal mining machine, characterized in that: It comprises a plurality of top guard plates (200) and a top plate supporting hydraulic system according to any one of claims 1 to 9, wherein the top guard plates (200) are connected to the top guard plate cylinders (100) in a one-to-one correspondence.

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