Forced circulation lubrication system for rocker arm of coal mining machine suitable for coal seams with large inclination angle

Abstract

The present invention relates to a forced circulation lubrication system for a rocker arm of a coal mining machine suitable for use under conditions of a high-inclination coal seam, comprising a low-speed end oil needle, a first oil circuit, a gear pump, a second oil circuit, a through oil needle, a third oil circuit and a high-speed end oil needle which are sequentially connected and communicated with each other, the high-speed and low-speed end oil needles are respectively close to the gears between the first and second shafts of the rocker arm and between the two meshing gears at the end of the rocker arm spur gear cavity, the high-speed and low-speed end oil needles as the oil discharge ends are respectively located at the gear meshing side of the first and second shafts of the rocker arm and the gear meshing side of the two meshing gears at the end of the rocker arm spur gear cavity, the rotating shaft of the gear pump is coaxially fixed with the rocker arm three-axis, the high-speed and low-speed end oil needles are both provided with oil injection ports which are communicated with their respective channels, and the oil injection ports of the high-speed and low-speed end oil needles are respectively directed toward the meshing area of ​​the first and second shafts of the rocker arm and the meshing area of ​​the two meshing gears at the end of the rocker arm spur gear cavity. The present invention can solve the problem of insufficient lubrication of high-position gears and bearings in the transmission system of the rocker arm of a coal mining machine under conditions of a high-inclination working face.

Description

Technical Field

[0001] The invention relates to a forced circulation lubrication system for a rocker arm of a coal mining machine, which can make the corresponding coal mining machine suitable for mining coal seams with large dip angles. Background Art

[0002] In recent years, with the large-scale development of coal seams with better conditions, coal seams with relatively poor conditions such as large dip angles have entered a large-scale mining period. Unlike the working face of a horizontal coal seam, the three equipment on the working face of a large dip angle coal seam must be tilted at the same angle as the coal seam, which puts forward new requirements for the lubrication of the transmission system in the gear reducer of each equipment. Especially for electric traction coal mining machines, as the coal mining machine is towing, if the roller of its rocker arm is to mine the upper cut coal, the transmission direction of the gear box of the rocker arm may even reach an angle perpendicular to the ground level. When the gear box has a large dip angle with the ground along the transmission direction, the gears and bearings at the top of the transmission chain cannot meet the normal lubrication requirements by relying on traditional splash oil bath lubrication, which can easily cause poor lubrication of the gears and bearings at the top of the gear box.

[0003] In order to solve this problem, the industry has developed a method of adding a self-made spiral vane pump to the high-speed and low-speed ends of the rocker gear reducer to introduce gear oil from a low position to a high position. Since the self-made spiral vane pumps at the high and low speed ends of the rocker gear reducer work under non-vacuum pressure conditions, the oil is usually pressed from a low position to a high position only by the thrust of the spiral vanes, which is usually not effective. In particular, when the working surface has a large inclination angle and the rocker arm is long, resulting in a large height difference of the oil, it is difficult for this self-made spiral vane pump to have such a large head, which often causes the lubrication of high-position gears and bearings to fail. In addition, adding a self-made spiral vane pump to the low-speed end of the rocker gear reducer will cause the outermost end of the rocker housing to be lengthened. This protruding part of the structure is difficult to protect and is very easy to wear, and it will also affect the amount of the rocker arm lying. Summary of the invention

[0004] The purpose of the present invention is to provide a forced circulation lubrication system for the rocker arm of a coal mining machine suitable for use in coal seams with large inclination angles, which can solve the problem of insufficient lubrication of gears and bearings above the gear oil level in the transmission system of the rocker arm of a coal mining machine under conditions of large inclination working faces, and meet the requirements of forced circulation continuous lubrication.

[0005] The main technical solutions of the present invention are:

[0006] A forced circulation lubrication system for a coal mining machine rocker arm suitable for coal seams with large inclination angles, comprising a low-speed end oil needle, a through oil needle and a high-speed end oil needle in a slender rod-shaped structure and fixedly installed in a rocker arm cavity in a horizontally extended state forward and backward. The low-speed end oil needle, the through oil needle and the high-speed end oil needle are all provided with a channel connecting their respective front and rear ends. The low-speed end oil needle is connected and communicated with one end of the through oil needle through a first oil circuit, a gear pump and a second oil circuit in sequence, and the other end of the through oil needle is connected and communicated with the high-speed end oil needle through a third oil circuit, forming a whole forced lubrication oil circuit from the low-speed end oil needle to the high-speed end oil needle. In the extension direction of the rocker arm transmission system, the high-speed end oil needle is close to a position between the first and second shaft gears of the rocker arm, and the low-speed end oil needle is close to a position between two meshing gears at the very end of the rocker arm spur gear cavity. The high-speed end oil needle as the oil discharge end is located at the gear meshing side of the first and second shaft gears of the rocker arm, the low-speed end oil needle as the oil discharge end is located at the gear meshing side of the two gears meshing at the very end of the rocker arm spur gear cavity, the through oil needle and the high-speed end oil needle are located on the same side of the center line connecting the first and second shaft gears of the rocker arm, the gear pump is located outside the rocker arm cavity, and its rotating shaft is coaxially fixedly connected with a transmission shaft in the rocker arm transmission system, the low-speed end oil needle and the high-speed end oil needle are both provided with oil injection ports communicated with their respective channels, the oil injection port of the low-speed end oil needle faces the meshing area of ​​the two gears meshing at the very end of the rocker arm spur gear cavity, the oil injection port of the high-speed end oil needle faces the meshing area of ​​the first and second shaft gears of the rocker arm, and the openings on the channels of the high-speed end oil needle and the low-speed end oil needle as the oil discharge end, which are located at the end of the forced lubrication oil circuit, are in a blocked state.

[0007] The first oil circuit includes an oil passage and an oil pipe arranged in the rocker arm housing, the oil pipe is connected between the oil passage and the gear pump, the second oil circuit is only a section of the oil pipe, and the third oil circuit is only a section of the oil passage arranged in the rocker arm housing.

[0008] The inlet pipeline of the gear pump is preferably also provided with a filter.

[0009] Furthermore, the low-speed end oil needle and the high-speed end oil needle are both installed as a cantilever structure, and the cantilevered end of the low-speed end oil needle and the cantilevered end of the high-speed end oil needle in the front-to-back direction are respectively close to the middle of the tooth width direction of the two gears meshing at the very end of the rocker arm spur tooth cavity and the middle of the tooth width direction of the gears of the first and second shafts of the rocker arm.

[0010] In the front-to-back direction, the respective oil injection ports of the low-speed oil needle and the high-speed oil needle are preferably aimed at the middle of the tooth width direction of the two gears meshing at the very end of the rocker arm spur gear cavity and the middle of the tooth width direction of the rocker arm's first and second shaft gears.

[0011] The fixed ends of the low-speed oil needle and the high-speed oil needle are respectively installed on the shell walls on the coal wall side and the old pond side of the rocker arm shell, and the front and rear ends of the through oil needle are respectively installed on the shell walls on the old pond side and the coal wall side of the rocker arm shell.

[0012] The gear pump is connected to one end of the through oil needle close to the Laotang side through the second oil passage.

[0013] The gear pump is preferably located at the corner between the rocker arm cutting motor hole housing and the large surface of the rocker arm old pond side. Horizontally extending reinforcing ribs are provided above and below the corner, and a protective cover is installed on the outside of the reinforcing rib plate. The rocker arm cutting motor hole housing, the large surface of the rocker arm old pond side, the protective cover and the reinforcing rib plate form a closed pump installation cavity, and the gear pump is located in the pump installation cavity.

[0014] Preferably, the channel openings on the respective overhanging ends of the low-speed oil needle and the high-speed oil needle are arranged as threaded holes, and the channel openings on the respective overhanging ends of the high-speed oil needle and the low-speed oil needle serving as the oil discharge end are sealed by plugs or by welding end plates.

[0015] The third oil circuit preferably includes two oil channel branches respectively arranged on the top plate and the bottom plate of the rocker arm housing, and the two oil channel branches are switched for use when the rotation direction of the drum changes.

[0016] The beneficial effects of the present invention are:

[0017] The present invention uses a relatively simple structure to continuously deliver the gear oil in the oil pool from a low position to the gears and bearings at a high position to lubricate them. After lubrication, the gear oil flows back into the oil pool due to gravity, thereby solving the problem of insufficient lubrication of high-position gears and bearings above the gear oil level in the rocker arm transmission system of the coal mining machine under the condition of a large-angle working face, and meeting the requirements of forced circulation continuous lubrication.

[0018] Even when the working surface has a large inclination angle and the rocker arm is long, resulting in a large height difference between the high and low positions, the present invention can ensure effective lubrication of the high-position gears and bearings without changing the shape structure and size of the rocker arm, and therefore will not affect the amount of the rocker arm lying.

[0019] Since the third oil circuit includes two oil channel branches respectively arranged on the top plate and the bottom plate of the rocker arm housing, the two oil channel branches respectively correspond to the installation positions of the two through oil needles and the high-speed end oil needle. When the rotation direction of the drum changes, in addition to adjusting the position of each oil needle according to the setting principles of each oil needle, it is only necessary to switch another oil channel branch as the third oil circuit, which is convenient for adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the working state of the left rocker arm on the left working surface with a large inclination angle;

[0021] Figure 2 It is a schematic diagram of the working state of the right rocker arm on the left working surface with a large inclination angle;

[0022] Figure 3It is a schematic diagram of the working state of the left rocker arm on the right working surface with a large inclination angle;

[0023] Figure 4 It is a schematic diagram of the working state of the right rocker arm on the right working surface with a large inclination angle;

[0024] Figure 5 It is a structural schematic diagram of the lubrication system installed on the left rocker arm of the left working surface with a large inclination angle;

[0025] Figure 6 It is a structural schematic diagram of an embodiment of a high-speed end oil needle;

[0026] Figure 7 It is a structural schematic diagram of an embodiment of a low-speed end oil needle;

[0027] Figure 8 It is a structural schematic diagram of an embodiment of a through oil needle.

[0028] Figure numerals: 1. Low-speed end oil needle; 2. First oil circuit; 3. Gear pump; 4. Through oil needle; 5. Third oil circuit; 6. High-speed end oil needle; 7. Rocker arm. DETAILED DESCRIPTION

[0029] like Figure 1-5 As shown, the present invention discloses a forced circulation lubrication system (referred to as lubrication system) for rocker arms of coal mining machines suitable for coal seams with large dip angles, comprising a low-speed end oil needle 1, a through oil needle 4 and a high-speed end oil needle 6 which are in a slender rod-shaped structure and are fixedly installed in the cavity of a rocker arm 7 in a horizontally extended state in the front and rear directions. The low-speed end oil needle, the through oil needle and the high-speed end oil needle are all provided with a hole connecting the front and rear ends of each of them as a channel for oil to flow therein. The low-speed end oil needle 1 is connected and communicated with one end of the through oil needle 4 through the first oil circuit 2, the gear pump 3 and the second oil circuit in sequence, and the other end of the through oil needle is connected and communicated with the high-speed end oil needle 6 through the third oil circuit 5, forming a whole forced lubrication oil circuit from the low-speed end oil needle to the high-speed end oil needle. The low-speed end oil needle or the high-speed end oil needle near the oil suction port of the gear pump is the oil suction end of the lubrication system, and the high-speed end oil needle or the low-speed end oil needle near the oil outlet of the gear pump is the oil discharge end of the lubrication system. The oil enters the forced lubrication oil circuit from the oil suction end and then flows out from the oil discharge end. By changing the rotation direction of the gear pump, the oil suction end and the oil discharge end of the lubrication system can be switched, so that the oil can flow from the low-speed end oil needle to the high-speed end oil needle through the forced lubrication oil circuit, and can also flow from the high-speed end oil needle to the low-speed end oil needle.

[0030] The above-mentioned forced lubrication oil circuit is arranged along the rocker arm transmission system, specifically: in the extension direction of the rocker arm transmission system, the high-speed end oil needle is close to the position between the first shaft gear and the second shaft gear of the rocker arm transmission system (referred to as the first and second shaft gears of the rocker arm transmission system), and the low-speed end oil needle is close to the position between the last spur gear of the spur gear cavity of the rocker arm transmission system and the gear meshing therewith (referred to as the two gears meshing at the last end of the rocker arm spur gear cavity), wherein the high-speed end oil needle as the oil discharge end is located on the gear meshing side of the first and second shaft gears of the rocker arm, and the low-speed end oil needle as the oil discharge end is located on the gear meshing side of the two gears meshing at the last end of the rocker arm spur gear cavity, and the through oil needle and the high-speed end oil needle are located on the same side of the center line of the first and second shaft gears of the rocker arm (the "side" here refers to the gear meshing side or the gear disengagement side). The gear pump is located outside the rocker arm cavity, and its rotating shaft is coaxially fixedly connected with one of the transmission shafts in the rocker arm transmission system (for example, the third shaft, referred to as the rocker arm three shafts), and is driven to rotate by the shaft in the rocker arm transmission system. Furthermore, the high-speed end oil needle as the oil suction end is preferably arranged on the gear disengagement side of the gears of the first and second shafts of the rocker arm, and the low-speed end oil needle as the oil discharge end is preferably arranged on the gear disengagement side of the two gears meshing at the end of the rocker arm spur gear cavity. Which shaft in the rocker arm transmission system the gear pump is connected to depends mainly on which shaft has a space suitable for installing the gear pump at the corresponding position.

[0031] The low-speed end oil needle and the high-speed end oil needle are both provided with oil injection ports connected to their respective channels. The oil injection port of the low-speed end oil needle faces the meshing area of ​​the two gears meshing at the end of the rocker arm spur gear cavity, and the oil injection port of the high-speed end oil needle faces the meshing area of ​​the rocker arm's first and second shaft gears. When the oil injection port sprays gear oil outward, the oil will be sprayed from the meshing side of the corresponding gear pair to the meshing area tooth surface of the corresponding gear pair, so that the corresponding gear pair is directly lubricated. The openings at the end of the forced lubrication oil circuit on the channels of the high-speed end oil needle and the low-speed end oil needle as the oil discharge end are in a blocked state.

[0032] A set of the lubrication system is installed on the left and right rocker arms of the same coal mining machine, and the gear pumps of the lubrication systems on the left and right rocker arms rotate in opposite directions, so that the flow direction of the oil in the lubrication system is opposite. That is, taking the left working face as an example, if the oil in the lubrication system on the left rocker arm flows from the low-speed end oil needle to the high-speed end oil needle, then the oil in the lubrication system on the right rocker arm flows from the high-speed end oil needle to the low-speed end oil needle.

[0033] The lubrication system is mainly suitable for the forced circulation lubrication of the transmission system in the rocker arm of the coal mining machine under the working face condition of large inclination angle (for example, the 40-degree inclination angle shown in the attached figure). When the low-speed end oil needle is in a low position (for example, the left rocker arm of the left working face), the gear pump is adjusted to suck oil from the low-speed end through the low-speed end oil needle and the gear oil is sprayed through the high-speed end oil needle to the meshing area of ​​the first-axis gear and the second-axis gear of the rocker arm, thereby realizing the forced circulation continuous lubrication of the transmission system inside the rocker arm. Similarly, when the high-speed end oil needle is in a low position (for example, the right rocker arm of the left working face), the gear pump is adjusted to suck oil from the high-speed end through the high-speed end oil needle and the gear oil is sprayed through the low-speed end oil needle to the meshing area of ​​the two gears meshing at the very end of the rocker arm straight tooth cavity, thereby realizing the forced circulation continuous lubrication of the transmission system inside the rocker arm.

[0034] The lubrication system can provide a systematic solution for the lubrication of the transmission system such as the high gears and bearings of the rocker arm of the coal mining machine under the condition of a large-angle coal seam, so as to meet the normal working requirements of the coal mining machine on the large-angle working face.

[0035] Usually, the first oil circuit includes an oil passage and an oil pipe arranged in the rocker arm housing. The oil pipe is the oil inlet and outlet pipe of the gear pump, connected between the oil passage and the gear pump. The second oil circuit is only a section of oil pipe, and the third oil circuit is only a section of oil passage arranged in the rocker arm housing. In the embodiment shown in the drawings, the oil passage in the first oil circuit is formed by connecting two sections of oil passages arranged in the side wall and the top plate of the old pond side of the rocker arm.

[0036] The inlet pipeline of the gear pump is preferably provided with a filter to filter the gear oil entering the gear pump.

[0037] Furthermore, the low-speed end oil needle and the high-speed end oil needle are preferably installed as a cantilever structure, and the cantilevered end of the low-speed end oil needle and the cantilevered end of the high-speed end oil needle in the front-to-back direction are respectively close to the middle of the tooth width direction of the two gears meshing at the very end of the rocker arm spur tooth cavity and the middle of the tooth width direction of the rocker arm's first and second shaft gears.

[0038] In the front-to-back direction, the respective oil injection ports of the low-speed end oil needle and the high-speed end oil needle are preferably aimed at the middle of the two gears meshing at the end of the rocker arm spur gear cavity and the middle of the gears of the first and second shafts of the rocker arm in the direction of tooth width. In this case, the length of the low-speed end oil needle is slightly longer than half the width of the spur gear at the end of the rocker arm spur gear cavity, and the length of the high-speed end oil needle is slightly longer than half the width of the gears of the first and second shafts of the rocker arm.

[0039] The fixed ends of the low-speed end oil needle and the high-speed end oil needle are respectively mounted on the housing wall of the rocker housing on the old pond side and the coal wall side with a flange structure. In this embodiment, the channel opening close to the flange on the high-speed end oil needle is radially arranged at the end of the oil needle body (the part of the oil needle other than the flange) close to the flange, and communicates with one end of the third oil circuit; the channel opening close to the flange on the low-speed end oil needle is radially arranged on the flange, and includes a plurality of circumferentially spaced ones, and communicates with the oil channel in the first oil circuit.

[0040] The front and rear ends of the through oil needle are respectively installed on the shell wall on the coal wall side and the old pond side of the rocker arm shell, and one end is installed on the shell wall with a flange structure. In this embodiment, the front end of the through oil needle is installed on the shell wall on the coal wall side of the rocker arm shell with a flange structure, and the channel opening on the through oil needle close to the flange is radially arranged at the end of the oil needle body close to the flange, and is connected to the other end of the third oil circuit.

[0041] The gear pump is connected to one end of the through oil needle close to the Laotang side through the second oil passage.

[0042] The gear pump is preferably located at the corner between the rocker arm cutting motor hole housing and the large surface of the rocker arm old pond side. Horizontally extending reinforcing ribs are provided above and below the corner, and a protective cover is installed on the outside of the reinforcing ribs. The rocker arm cutting motor hole housing, the large surface of the rocker arm old pond side, the protective cover and the reinforcing ribs form a closed pump installation cavity. The gear pump is located in the pump installation cavity and is protected in all directions by the pump installation cavity.

[0043] The openings of the channels on the respective overhanging ends of the low-speed end oil needle and the high-speed end oil needle are both set as threaded holes. When the coal mining machine using the lubrication system mines coal at a high-angle working face, the low-speed end oil needle or the high-speed end oil needle in a low position, as the oil suction end of the lubrication system in which it is located, is completely immersed below the oil level, and the corresponding threaded hole becomes the main oil suction port of the lubrication system, and the oil injection port serves as the auxiliary oil suction port, sucking oil into the lubrication system together, while the high-speed end oil needle or the low-speed end oil needle in a high position becomes the oil discharge end, and the threaded hole on it is blocked with a plug, and the oil injection port on it discharges oil outward. The diameter of the oil injection port is small, and the aperture of the threaded hole is much larger than the diameter of the oil injection hole.

[0044] Another optional structure of the high-speed end oil needle and the low-speed end oil needle as the oil discharge end is: the channel openings on the respective overhanging ends of the low-speed end oil needle and the high-speed end oil needle are closed by welding end plates, or the respective overhanging ends of the low-speed end oil needle and the high-speed end oil needle are directly made into closed structures.

[0045] The third oil circuit preferably includes two oil channel branches respectively arranged on the top plate and the bottom plate of the rocker housing, and the two oil channel branches correspond to the two installation positions of the through oil needle respectively, and only one oil channel branch needs to be connected when in use. When the rotation direction of the drum needs to be changed, the position of each oil needle needs to be adjusted according to the setting principle of each oil needle. At that time, when the installation position of the through oil needle and the high-speed end oil needle is adjusted, another oil channel branch needs to be switched to serve as the third oil circuit.

[0046] The working principle of the lubrication system is as follows: for the left rocker arm with a large inclination angle on the left working surface, the low-speed end oil needle is located in the oil pool, and there is no gear oil at the high-speed end oil needle because the position is too high. Taking the gear pump installed on the rocker arm three-axis as an example, when the rotation direction of the three-axis gear is determined, by selecting the rotation direction of the gear pump installed at the rocker arm three-axis, the gear pump generates suction from the low-speed end to the high-speed end of the rocker arm transmission system, and the gear oil in the low-speed end oil pool is sent to the high-speed end oil needle through the low-speed end oil needle, the first oil circuit, the filter, the gear pump, the second oil circuit, the through oil needle and the third oil circuit in sequence, and finally sprayed out from the oil injection port of the high-speed end oil needle, realizing the transfer of gear oil from the low-speed end to the high-speed end of the rocker arm transmission system, lubricating the high-speed end gears and bearings, and after lubrication, the gear oil will flow back from the high-speed end to the low-speed end due to gravity and other effects, thereby realizing circulation. In this working state, no plug is installed in the threaded hole of the overhanging end of the oil needle at the low-speed end, which remains open to reduce oil suction resistance; a plug is installed in the threaded hole of the overhanging end of the oil needle at the high-speed end, leaving only a smaller diameter oil injection port to spray oil outward, which can enhance the oil injection effect; the filter is installed on the pipeline close to the low-speed end of the gear pump.

[0047] For the right rocker arm with a large inclination angle on the left working surface, the high-speed end oil needle is located in the oil pool, and there is no gear oil at the low-speed end oil needle because it is too high. Taking the gear pump installed on the rocker arm three-axis as an example, when the rotation direction of the three-axis gear is determined, the rotation direction of the gear pump installed at the rocker arm three-axis is selected to make the gear pump generate suction from the high-speed end to the low-speed end of the rocker arm transmission system, and the gear oil in the high-speed end oil pool is sent to the low-speed end oil needle through the high-speed end oil needle, the third oil circuit, the through oil needle, the second oil circuit, the filter, the gear pump and the first oil circuit in turn, and finally sprayed out from the oil injection port of the low-speed end oil needle, realizing the transfer of gear oil from the high-speed end to the low-speed end of the rocker arm transmission system, lubricating the low-speed end gears and bearings. After lubrication, the gear oil will flow back to the high-speed end from the low-speed end due to gravity and other effects, thereby realizing circulation. In this working state, no plug is installed in the threaded hole of the overhanging end of the oil needle at the high-speed end, which remains open to reduce oil suction resistance; a plug is installed in the threaded hole of the overhanging end of the oil needle at the low-speed end, leaving only a smaller diameter oil injection port to spray oil outward, which can enhance the oil injection effect; the filter is installed on the pipeline close to the high-speed end of the gear pump.

[0048] For the right rocker arm of the large-angle right working surface, its working process is the same as the left rocker arm of the large-angle left working surface mentioned above; and the working process of the left rocker arm of the large-angle right working surface is the same as the right rocker arm of the large-angle left working surface mentioned above.

[0049] The lubrication system is used in the spur tooth cavity of the rocker arm, and the corresponding rocker arm can be either a rocker arm with chamber lubrication or a rocker arm without chamber lubrication.

[0050] The front referred to in this article is the direction pointing horizontally to the coal wall.

Claims

1. A forced circulation lubrication system for rocker arms of coal mining machines suitable for use in coal seams with large inclination angles, characterized in that: The low-speed oil needle, the through oil needle and the high-speed oil needle are slender rod-shaped structures and fixedly installed in the rocker arm cavity in a horizontally extended state. The low-speed oil needle, the through oil needle and the high-speed oil needle are all provided with channels connecting their respective front and rear ends. The low-speed oil needle is connected and communicated with one end of the through oil needle through the first oil circuit, the gear pump and the second oil circuit in sequence, and the other end of the through oil needle is connected and communicated with the high-speed oil needle through the third oil circuit, forming a whole forced lubrication oil circuit from the low-speed oil needle to the high-speed oil needle. In the extension direction of the rocker arm transmission system, the high-speed oil needle is close to the position between the first and second shaft gears of the rocker arm, and the low-speed oil needle is close to the position between the two gears meshing at the very end of the rocker arm spur gear cavity. The high-speed oil needle serves as the oil discharge end. Located on the gear meshing side of the first and second shaft gears of the rocker arm, the low-speed end oil needle as the oil discharge end is located on the gear meshing side of the two gears meshing at the very end of the rocker arm spur gear cavity, the through oil needle and the high-speed end oil needle are located on the same side of the center line of the first and second shaft gears of the rocker arm, the gear pump is located outside the rocker arm cavity, and its rotating shaft is coaxially fixedly connected with a transmission shaft in the rocker arm transmission system, the low-speed end oil needle and the high-speed end oil needle are both provided with oil injection ports communicated with their respective channels, the oil injection port of the low-speed end oil needle faces the meshing area of ​​the two gears meshing at the very end of the rocker arm spur gear cavity, the oil injection port of the high-speed end oil needle faces the meshing area of ​​the first and second shaft gears of the rocker arm, and the openings on the channels of the high-speed end oil needle and the low-speed end oil needle as the oil discharge end, which are located at the end of the forced lubrication oil circuit, are in a blocked state.

2. The forced circulation lubrication system for rocker arms of coal mining machines suitable for use in coal seams with large inclination angles as claimed in claim 1, characterized in that: The first oil circuit includes an oil passage and an oil pipe arranged in the rocker arm housing, the oil pipe is connected between the oil passage and the gear pump, the second oil circuit is only a section of the oil pipe, and the third oil circuit is only a section of the oil passage arranged in the rocker arm housing.

3. The forced circulation lubrication system for rocker arm of coal mining machine suitable for coal seam with large dip angle as claimed in claim 2, characterized in that: A filter is also provided on the inlet pipeline of the gear pump.

4. The forced circulation lubrication system for rocker arm of a coal mining machine suitable for use in coal seams with a large inclination angle as claimed in claim 1, 2 or 3, characterized in that: The low-speed end oil needle and the high-speed end oil needle are both installed as a cantilever structure, and the cantilevered end of the low-speed end oil needle and the cantilevered end of the high-speed end oil needle in the front-to-back direction are respectively close to the middle of the tooth width direction of the two gears meshing at the very end of the rocker arm spur tooth cavity and the middle of the tooth width direction of the rocker arm first and second shaft gears.

5. The forced circulation lubrication system for rocker arm of coal mining machine suitable for coal seam with large dip angle as claimed in claim 4, characterized in that: In the front-to-back direction, the respective oil injection ports of the low-speed end oil needle and the high-speed end oil needle are respectively aimed at the middle of the tooth width direction of the two gears meshing at the very end of the rocker arm spur gear cavity and the middle of the tooth width direction of the rocker arm first and second shaft gears.

6. The forced circulation lubrication system for rocker arms of coal mining machines suitable for use in coal seams with large inclination angles as claimed in claim 5, characterized in that: The fixed ends of the low-speed oil needle and the high-speed oil needle are respectively installed on the shell walls on the old pond side and the coal wall side of the rocker arm shell, and the front and rear ends of the through oil needle are respectively installed on the shell walls on the coal wall side and the old pond side of the rocker arm shell.

7. The forced circulation lubrication system for rocker arm of a coal mining machine suitable for use in coal seams with a large dip angle as claimed in claim 6, characterized in that: The gear pump is connected to one end of the through oil needle close to the Laotang side through the second oil passage.

8. The forced circulation lubrication system for rocker arm of coal mining machine suitable for use in coal seams with a large dip angle as claimed in claim 7, characterized in that: The gear pump is located at the corner between the rocker arm cutting motor hole housing and the large surface of the rocker arm old pond side. Horizontally extending reinforcing ribs are provided above and below the corner. A protective cover is installed on the outside of the reinforcing ribs. The rocker arm cutting motor hole housing, the large surface of the rocker arm old pond side, the protective cover and the reinforcing ribs form a closed pump installation cavity, and the gear pump is located in the pump installation cavity.

9. The forced circulation lubrication system for rocker arm of a coal mining machine suitable for use in coal seams with a large dip angle as claimed in claim 4, 5, 6, 7 or 8, characterized in that: The channel openings on the overhanging ends of the low-speed oil needle and the high-speed oil needle are both arranged as threaded holes, and the channel openings on the overhanging ends of the high-speed oil needle and the low-speed oil needle serving as the oil discharge end are blocked by plugs or closed by welding end plates.

10. The forced circulation lubrication system for rocker arms of coal mining machines suitable for use in coal seams with a large dip angle as claimed in claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that: The third oil circuit includes two oil channel branches which are respectively arranged on the top plate and the bottom plate of the rocker arm housing. The two oil channel branches are switched for use when the rotation direction of the drum changes.

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