Coal mining machine follow-up automatic grease injection device and method

Abstract

The present application discloses a follow-up automatic grease injection device and method for a coal mining machine, relating to the technical field of coal mining machines. The follow-up automatic grease injection device for a coal mining machine includes a follower rod and a grease injection mechanism. The grease injection mechanism includes a housing and a push rod slidably connected to the housing. A grease injection chamber is defined within the housing, the grease injection chamber being connected to a grease storage chamber and a grease injection pipeline for injecting grease into the coal mining machine. A one-way valve is provided between the grease injection chamber and the grease storage chamber to allow grease in the grease storage chamber to flow into the grease injection chamber. A one-way valve is provided between the grease injection chamber and the grease injection pipeline to allow grease in the grease injection chamber to flow into the grease injection chamber. The push rod is configured to slide back and forth to change the size of the grease injection chamber. One end of the follower rod is fixedly connected to the coal mining machine rocker arm, and the follower rod is configured to drive the push rod to slide as the coal mining machine rocker arm rotates. The present application facilitates grease injection into the coal mining machine.

Description

Technical Field

[0001] The present application relates to the technical field of coal mining machines, and in particular to a follow-up automatic grease injection device and method for coal mining machines. Background Art

[0002] Coal mining machine is one of the important equipment for realizing the mechanization and modernization of coal mine production; it has the effect of reducing physical labor and improving safety, and can achieve the goals of high output, high efficiency and low consumption.

[0003] Coal mining machines include moving parts such as rotating coal mining machine rocker arms that require a large amount of grease for lubrication. These moving parts require workers to frequently inject grease, which is a large workload and easy to miss. Once missed, it will cause irreversible parts loss to the coal mining machine components, resulting in large economic losses.

[0004] At present, when grease is injected into coal mining machines, motors, hydraulics or compressed air in coal mines are mainly used to provide power for the grease injection device, which makes the grease injection system complicated and difficult to manage, and is very inconvenient when grease is injected into coal mining machines. Summary of the Invention

[0005] In order to facilitate grease injection for a coal mining machine, the present application provides a follow-up automatic grease injection device and method for a coal mining machine.

[0006] On the one hand, the present application provides a follow-up automatic grease injection device for a coal mining machine, which adopts the following technical solutions:

[0007] A follow-up automatic grease injection device for a coal mining machine includes a follower rod and a grease injection mechanism. The grease injection mechanism includes a housing and a push rod slidably connected to the housing. A grease injection chamber is defined in the housing. The grease injection chamber is connected to a grease storage chamber and a grease injection pipeline for injecting grease into the coal mining machine. A one-way valve is provided between the grease injection chamber and the grease storage chamber to allow grease in the grease storage chamber to flow into the grease injection chamber. A one-way valve is provided between the grease injection chamber and the grease injection pipeline to allow grease in the grease injection chamber to flow into the grease injection pipeline. The push rod is used to slide back and forth to change the size of the grease injection chamber.

[0008] One end of the follower rod is fixedly connected to the rocker arm of the coal mining machine, and the follower rod is used to drive the push rod to slide as the rocker arm of the coal mining machine rotates.

[0009] By adopting the above technical solution, the rotation of the coal mining machine rocker arm drives the follower rod to rotate, thereby driving the push rod to slide, and the size of the grease injection chamber is changed by the sliding of the push rod, so that the pressure in the grease injection chamber changes; when the push rod slides to make the grease injection chamber larger, the pressure in the grease injection chamber becomes smaller, and at this time, the grease storage chamber pushes the grease into the grease injection chamber through the one-way valve under the action of pressure; when the push rod slides to make the grease injection chamber smaller, the pressure in the grease injection chamber becomes larger, and at this time, the grease in the grease injection chamber is pushed into the grease injection pipeline through the one-way valve under the action of pressure, and through multiple cycles of size changes of the grease injection chamber, the grease in the grease storage chamber is pushed into the grease injection pipeline and finally greases the coal mining machine, and the coal mining machine rocker arm provides grease injection power for the grease injection device, so that there is no need to carry other power sources when greasing the coal mining machine, making grease injection more convenient, and at the same time, the coal mining machine automatically greases itself when working, reducing the situation where maintenance personnel miss some grease injection points when manually greasing due to too many grease injection points on the coal mining machine.

[0010] Optionally, a slide groove communicating with the grease injection cavity is provided on the shell, and the push rod slides back and forth in the slide groove to adjust the space occupied by the push rod in the grease injection cavity.

[0011] By adopting the above technical solution, the push rod changes the size of the grease injection chamber by sliding in the slide groove, making the grease injection device simple in structure. When the push rod is driven to slide by the rotation of the coal mining machine rocker arm to change the size of the grease injection chamber, the grease injection device is not easily damaged, thereby extending the service life of the grease injection device.

[0012] Optionally, the follower rod abuts against the push rod, and a first spring is provided in the grease injection cavity, one end of the first spring abuts against the push rod, and the other end abuts against the inner wall of the grease injection cavity.

[0013] By adopting the above technical solution, when the follower rod swings with the coal mining machine rocker arm and pushes the push rod to slide, the push rod pushes the first spring to compress. When the coal mining machine rocker arm drives the follower rod away from the push rod, the elastic force of the first spring can push the push rod to slide toward the follower rod and always abut against the follower rod, so that the push rod can slide back and forth, thereby realizing automatic grease injection of the grease injection device.

[0014] Optionally, a connecting groove is provided on the inner wall of the slide groove, a first channel connecting the connecting groove and the grease storage chamber is provided on the shell, and a second channel connecting the connecting groove and the grease injection cavity is provided on the push rod. When the push rod slides, the second channel remains connected to the connecting groove.

[0015] By adopting the above technical solution, the grease storage chamber is connected with the grease injection chamber through the first channel, the connecting groove and the second channel, so that the grease in the grease storage chamber can smoothly reach the grease injection chamber. The connecting groove allows the push rod to always be connected with the second channel during the sliding process, and at the same time allows a small amount of grease to enter between the push rod and the grease injection chamber, thereby lubricating the sliding of the push rod, reducing the obstruction of the push rod during the sliding process, and allowing the grease injection device to operate normally.

[0016] Optionally, a valve cavity is provided at one end of the push rod close to the first spring and inside the shell. The valve cavity on the push rod connects the second channel and the grease injection cavity. A third channel connected to another valve cavity is provided on the inner wall of the grease injection cavity. The third channel is connected to the grease injection pipeline through the valve cavity. The one-way valve includes a second spring and a valve ball located in the valve cavity. One end of the second spring abuts the valve ball, and the other end abuts the inner wall of the valve cavity. The valve ball can close the second channel or the third channel under the thrust of the second spring.

[0017] By adopting the above technical solution, the valve ball can block the second channel, so that the grease and air in the grease injection chamber cannot enter the second channel, so that when the push rod slides, the pressure in the grease injection chamber can be smoothly reduced, so that the grease in the grease storage chamber can be sucked into the first channel, the connecting groove and the second channel under the action of pressure, and the grease pushes the valve ball, the second spring is compressed, and the grease reaches the valve chamber and the grease injection chamber on the push rod. When the grease injection chamber stops expanding, the elastic force of the second spring pushes the valve ball to press against and close the second channel; the valve ball can The third channel is blocked so that the grease and air in the grease injection pipeline cannot enter the grease injection chamber, thereby making the grease injection chamber have good air tightness and allowing the pressure in the grease injection chamber to be reduced smoothly. At the same time, when the pressure in the grease injection chamber increases, the pressure in the grease injection chamber can push the valve ball away from the third channel, and the second spring is compressed, so that the grease can enter the grease injection pipeline through the third channel and the valve chamber, thereby smoothly grease the coal mining machine. When the pressure in the grease injection chamber no longer increases, the valve ball can press against and close the third channel under the elastic force of the second spring.

[0018] Optionally, a coaxial valve cover is threadedly connected to the inner surface of the valve cavity, a coaxial through hole is provided on the valve cover, and one end of the second spring abuts against the valve cover.

[0019] By adopting the above technical solution, the inside and outside of the valve cavity can be connected through the through hole on the valve cover, and the threaded valve cover can facilitate the installation of the valve ball and the second spring in the valve cavity, making the manufacture and installation of the grease injection device more convenient.

[0020] Optionally, a fat storage cylinder is threadedly connected to the shell, and the fat storage chamber is arranged in the fat storage cylinder.

[0021] By adopting the above technical solution, a grease storage cylinder is used to store grease, so that after the grease in the grease storage chamber is consumed, the grease storage cylinder can be replaced or refilled into the grease storage cylinder, thereby facilitating the addition of grease to the grease injection device, making the grease injection device more convenient to use.

[0022] Optionally, a sealing cover is slidably provided in the grease storage chamber, and an air vent is provided at one end of the grease storage cylinder away from the shell.

[0023] By adopting the above technical solution, the sealing cover can slide toward the shell under the action of pressure, thereby pushing the grease to move toward the shell, so that the grease in the grease storage cylinder can be utilized to the greatest extent and the deposition of grease in the grease storage cylinder can be reduced.

[0024] Optionally, a breathable layer covering the breathable holes is provided on the fat storage cylinder.

[0025] By adopting the above technical solution, the breathable layer can balance the pressure on both sides of the air hole, so that the sealing cover can move under the action of pressure. At the same time, the breathable layer can reduce the foreign matter that enters the grease storage cylinder through the air hole, reduce the situation where the sealing cover is stuck due to the sliding of foreign matter, and facilitate the sealing cover to slide away from the shell, so as to fill the grease storage cylinder with grease and realize the reuse of the grease storage cylinder.

[0026] On the other hand, the present application provides a grease injection method using the above-mentioned coal mining machine follow-up automatic grease injection device, which adopts the following technical solutions:

[0027] The method for automatic grease injection for a coal mining machine comprises the following steps:

[0028] S1. Fix one end of the follower rod to the rocker arm of the coal mining machine;

[0029] S2, fixedly connecting the housing of the grease injection mechanism to the fixed arm of the coal mining machine, and making the follower rod of the coal mining machine abut against the push rod;

[0030] S3. Make the coal mining machine work normally. The rocker arm of the coal mining machine starts to swing, driving the follower rod to rotate. The follower rod pushes the push rod to slide and injects grease into the coal mining machine.

[0031] By adopting the above technical solution, the coal mining machine's rocker arm provides grease injection power to the grease injection device, so that there is no need to carry other power sources when greasing the coal mining machine, making grease injection more convenient. At the same time, the coal mining machine automatically greases itself while working, reducing the situation where maintenance personnel miss some grease injection points during manual grease injection due to too many grease injection points on the coal mining machine.

[0032] In summary, this application has at least one of the following beneficial effects:

[0033] 1. The rotation of the shearer rocker arm provides power to the grease injection device, so that the grease injection device does not need to use other power sources, making it easier to inject grease into the shearer;

[0034] 2. The shearer automatically injects grease during operation, reducing the risk of maintenance personnel missing some injection points during manual grease injection.

[0035] 3. By replacing the grease reservoir or filling the grease reservoir with grease, the grease can be quickly refilled after the grease is consumed, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of the embodiment of the present application connected to the coal mining machine;

[0037] Figure 2 It is a schematic diagram of a partial cross-sectional structure of an embodiment of the present application;

[0038] Figure 3 yes Figure 2 A local enlarged schematic diagram of point A in the middle.

[0039] Explanation of the accompanying drawings: 1. Shell; 11. First channel; 12. Connecting groove; 13. Grease injection chamber; 14. Third channel; 15. Sealing groove; 151. Sealing ring; 16. Shell cover; 17. Slide groove; 2. Push rod; 21. Second channel; 3. Follower rod; 4. One-way valve; 41. Valve chamber; 42. Valve ball; 43. Second spring; 44. Valve cover; 441. Through hole; 5. First spring; 6. Grease storage cylinder; 61. Grease storage chamber; 62. Sealing cover; 63. Air vent; 64. Air permeable layer; 7. Grease injection pipeline; 8. Rocker arm; 9. Fixed arm. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-3 This application is described in further detail.

[0041] Example 1:

[0042] The embodiment of the present application discloses a follow-up automatic grease injection device for a coal mining machine, referring to Figure 1 and Figure 2 , including a follower rod 3 and a grease injection mechanism, the grease injection mechanism includes a shell 1 and a push rod 2 slidingly connected to the shell 1, a grease injection chamber 13 is opened in the shell 1, the grease injection chamber 13 is connected to a grease storage chamber 61 and a grease injection pipeline 7 for injecting grease into the coal mining machine, a one-way valve 4 is provided between the grease injection chamber 13 and the grease storage chamber 61, which allows the grease storage chamber 61 to pass into the grease injection chamber 13, and a one-way valve 4 is provided between the grease injection chamber 13 and the grease injection pipeline 7, which allows the grease injection chamber 13 to pass into the grease injection pipeline 7, and the push rod 2 is used to slide and change the size of the grease injection chamber 13; one end of the follower rod 3 is fixedly connected to the coal mining machine rocker arm 8, and the other end abuts against the push rod 2, and the follower rod 3 is used to drive the push rod 2 to slide as the coal mining machine rocker arm 8 rotates.

[0043] The rotation of the coal mining machine rocker arm 8 drives the follower rod 3 to rotate, thereby driving the push rod 2 to slide, and the sliding of the push rod 2 changes the size of the grease injection chamber 13, so that the pressure in the grease injection chamber 13 changes; when the push rod 2 slides to make the grease injection chamber 13 larger, the pressure in the grease injection chamber 13 becomes smaller. At this time, the grease storage chamber 61 pushes the grease into the grease injection chamber 13 through the one-way valve 4 under the action of pressure. When the push rod 2 slides to make the grease injection chamber 13 smaller, the pressure in the grease injection chamber 13 becomes larger. At this time, the grease in the grease injection chamber 13 is under pressure. Under strong action, the grease is pushed into the grease injection pipeline 7 through the one-way valve 4, and through multiple size changes of the grease injection chamber 13, the grease in the grease storage chamber 61 is pushed into the grease injection pipeline 7 and finally greases the coal mining machine. The rocker arm 8 of the coal mining machine provides grease injection power for the grease injection device, so that there is no need to carry other power sources when greasing the coal mining machine, making grease injection more convenient. At the same time, the coal mining machine automatically greases itself when working, reducing the situation where maintenance personnel miss some grease injection points when manually greasing due to too many grease injection points on the coal mining machine.

[0044] Reference Figure 1 and Figure 2 , a through cavity is opened on the shell 1, and the through cavity includes a grease injection cavity 13 and a slide groove 17. A shell cover 16 is threadedly connected to the shell 1 for closing the grease injection cavity 13 away from one end of the slide groove 17, and the push rod 2 slides in the slide groove 17; the follower rod 3 abuts against the push rod 2, and a first spring 5 is provided in the grease injection cavity 13, one end of the first spring 5 abuts against the push rod 2, and the other end abuts against the shell cover 16; the push rod 2 slides in the slide groove 17, thereby changing the space occupied by the push rod 2 in the grease injection cavity 13, thereby changing the size of the grease injection cavity 13, making the grease injection device simple in structure, and when the rocker arm 8 of the coal mining machine is rotated, the grease injection device 13 is rotated. When the push rod 2 is driven to slide and the size of the grease injection chamber 13 is changed, the grease injection device is not easily damaged, and the service life of the grease injection device is extended; when the follower rod 3 swings with the coal mining machine rocker arm 8 and pushes the push rod 2 to slide, the push rod 2 pushes the first spring 5 to compress. When the coal mining machine rocker arm 8 drives the follower rod 3 away from the push rod 2, the elastic force of the first spring 5 can push the push rod 2 to slide toward the follower rod 3, and always abuts against the follower rod 3, so that the push rod 2 can slide back and forth, thereby realizing automatic grease injection of the grease injection device; the shell cover 16 can facilitate the installation of the internal structure of the grease injection device and facilitate the production and manufacturing of the grease injection device.

[0045] Reference Figure 2 and Figure 3A connecting groove 12 is provided on the inner wall of the slide groove 17, a first channel 11 connecting the connecting groove 12 and the grease storage chamber 61 is provided on the shell 1, and a second channel 21 connecting the connecting groove 12 is provided on the push rod 2; a valve cavity 41 is provided on the end of the push rod 2 close to the first spring 5 and the interior of the shell 1, the valve cavity 41 on the push rod 2 connects the second channel 21 and the grease injection cavity 13, and a third channel 14 connected to another valve cavity 41 is provided on the inner wall of the grease injection cavity 13, and the third channel 14 is connected to the grease injection pipeline 7 through the valve cavity 41; a coaxial valve cover 44 is threadedly connected to the valve cavity 41, and a coaxial through hole 441 is provided on the valve cover 44; the one-way valve 4 includes a second spring 43 and a valve ball 42 located in the valve cavity 41, one end of the second spring 43 abuts the valve ball 42, and the other end abuts the valve cover 44. The valve ball 42 can close the second channel 21 or the third channel 14 under the thrust of the second spring 43.

[0046] The grease storage chamber 61 is connected to the grease injection chamber 13 through the first channel 11, the connecting groove 12 and the second channel 21, so that the grease in the grease storage chamber 61 can smoothly reach the grease injection chamber 13. The connecting groove 12 allows the push rod 2 to always be connected to the second channel 21 during the sliding process, and at the same time allows a small amount of grease to enter between the push rod 2 and the grease injection chamber 13, thereby lubricating the sliding of the push rod 2, reducing the obstruction of the push rod 2 during the sliding process, and allowing the grease injection device to operate normally.

[0047] The valve ball 42 can block the second channel 21, so that the grease and air in the grease injection chamber 13 cannot enter the second channel 21, so that when the push rod 2 slides, the pressure in the grease injection chamber 13 can be smoothly reduced, so that the grease in the grease storage chamber 61 can be sucked into the first channel 11, the connecting groove 12 and the second channel 21 under the action of pressure, and the grease pushes the valve ball 42, the second spring 43 is compressed, and the grease reaches the valve chamber 41 and the grease injection chamber 13 on the push rod 2. When the grease injection chamber 13 stops expanding, the elastic force of the second spring 43 pushes the valve ball 42 to press against and close the second channel 21.

[0048] The valve ball 42 can block the third channel 14, so that the grease and air in the grease injection pipeline 7 cannot enter the grease injection chamber 13, so that the grease injection chamber 13 has good air tightness, so that the pressure in the grease injection chamber 13 can be smoothly reduced. At the same time, when the pressure in the grease injection chamber 13 increases, the pressure in the grease injection chamber 13 can push the valve ball 42 away from the third channel 14, and the second spring 43 is compressed, so that the grease can enter the grease injection pipeline 7 through the third channel 14 and the valve chamber 41, thereby smoothly grease the coal mining machine. When the pressure in the grease injection chamber 13 no longer increases, the valve ball 42 can press against and close the third channel 14 under the elastic force of the second spring 43.

[0049] The through hole 441 on the valve cover 44 can communicate with the inside and outside of the valve cavity 41. The threaded valve cover 44 can facilitate the installation of the valve ball 42 and the second spring 43 in the valve cavity 41, making the manufacture and installation of the grease injection device more convenient.

[0050] Reference Figure 2 Two annular sealing grooves 15 are provided on the inner wall of the grease injection cavity 13, the connecting groove 12 is located between the two sealing grooves 15, and a sealing ring 151 is provided in the sealing groove 15. The sealing ring 151 can improve the airtightness of the grease injection cavity 13, so that the pressure in the grease injection cavity 13 can change with the sliding of the push rod 2, and at the same time can reduce the overflow of grease and reduce the waste of grease.

[0051] Reference Figure 2 A fat storage cylinder 6 is threadedly connected to the shell 1, and a fat storage chamber 61 is arranged in the fat storage cylinder 6; a sealing cover 62 is slidably arranged in the fat storage chamber 61, and a sealing groove 15 is provided on the side wall of the sealing cover 62, and a sealing ring 151 is provided in the sealing groove 15. An air hole 63 is provided at the end of the fat storage cylinder 6 away from the shell 1; a breathable layer 64 covering the air hole 63 is provided on the fat storage cylinder 6.

[0052] The grease storage cylinder 6 is used to store grease, so that after the grease in the grease storage chamber 61 is consumed, the grease storage cylinder 6 can be replaced or refilled into the grease storage cylinder 6, thereby facilitating the addition of grease to the grease injection device, making the grease injection device more convenient to use; the sealing groove 15 and the sealing ring 151 form a grease storage chamber 61 with good airtightness in the grease storage cylinder 6; the sealing cover 62 can slide in the direction close to the shell 1 under the action of pressure, thereby pushing the grease to move toward the shell 1, so that the grease in the grease storage cylinder 6 can be utilized to the greatest extent and the deposition of grease in the grease storage cylinder 6 is reduced; the air permeable layer 64 can balance the pressure on both sides of the air hole 63, so that the sealing cover 62 can move under the action of pressure. In addition, the air permeable layer 64 can reduce foreign matter entering the grease storage cylinder 6 through the air hole 63, reduce the situation where foreign matter causes the sealing cover 62 to slide and get stuck, and at the same time facilitate the sealing cover 62 to slide in the direction away from the shell 1, so as to facilitate the filling of grease into the grease storage cylinder 6 and realize the reuse of the grease storage cylinder 6.

[0053] The implementation principle of the automatic grease injection device for the coal mining machine of the embodiment of the present application is as follows: to make the coal mining machine work normally, the coal mining machine rocker arm 8 rotates and drives the follower rod 3 to rotate, thereby pushing the push rod 2 to slide, so that the pressure in the grease injection chamber 13 increases, and the grease in the grease injection chamber 13 enters the grease injection pipeline 7 through the third channel 14 and the valve chamber 41. When the coal mining machine rocker arm 8 rotates away from the push rod 2, the push rod 2 slides toward the coal mining machine rocker arm 8 under the action of the elastic force of the first spring 5, so that the pressure in the grease injection chamber 13 decreases, so that the grease in the grease storage chamber 61 passes through the first valve chamber 41 in sequence under the action of pressure. The channel 11, the connecting groove 12, the second channel 21 and the valve chamber 41 enter the grease injection chamber 13; in the process of the rotation of the coal mining machine rocker arm 8, after multiple cycles, the grease in the grease injection chamber 13 finally reaches the grease injection pipeline 7 and is injected into the coal mining machine to be greased. The rocker arm 8 of the coal mining machine provides grease injection power for the grease injection device, so that there is no need to carry other power sources when greasing the coal mining machine, making grease injection more convenient. At the same time, the coal mining machine automatically greases itself when working, reducing the situation where maintenance personnel miss some grease injection points when manually greasing due to too many grease injection points on the coal mining machine.

[0054] Example 2:

[0055] The embodiment of the present application discloses a grease injection method using the coal mining machine follow-up automatic grease injection device in Example 1, comprising the following steps:

[0056] S1. Fix one end of the follower rod 3 to the shearer rocker arm 8;

[0057] S2. The housing 1 of the grease injection mechanism is fixedly connected to the fixed arm 9 of the coal mining machine, and the follower rod 3 of the coal mining machine is brought into contact with the push rod 2;

[0058] S3. To make the coal mining machine work normally, the rocker arm 8 of the coal mining machine starts to swing, driving the follower rod 3 to rotate, and the follower rod 3 pushes the push rod 2 to slide, injecting grease into the coal mining machine.

[0059] The coal mining machine's rocker arm 8 provides grease injection power to the grease injection device, so that there is no need to carry other power sources when greasing the coal mining machine, making grease injection more convenient. At the same time, the coal mining machine automatically greases itself when working, reducing the situation where maintenance personnel miss some grease injection points during manual grease injection due to too many grease injection points on the coal mining machine.

[0060] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. The automatic grease injection device for coal mining machine is characterized by: The invention comprises a follower rod (3) and a grease injection mechanism, wherein the grease injection mechanism comprises a housing (1) and a push rod (2) slidably connected to the housing (1); a grease injection chamber (13) is provided in the housing (1); the grease injection chamber (13) is connected to a grease storage chamber (61) and a grease injection pipeline (7) for injecting grease into the coal mining machine; a one-way valve (4) is provided between the grease injection chamber (13) and the grease storage chamber (61) to allow the grease in the grease storage chamber (61) to flow into the grease injection chamber (13); a one-way valve (4) is provided between the grease injection chamber (13) and the grease injection pipeline (7) to allow the grease in the grease injection chamber (13) to flow into the grease injection pipeline (7); and the push rod (2) is used to slide back and forth to change the size of the grease injection chamber (13); One end of the follower rod (3) is fixedly connected to the coal mining machine rocker arm (8), and the follower rod (3) is used to drive the push rod (2) to slide as the coal mining machine rocker arm (8) rotates; The housing (1) is provided with a slide groove (17) communicating with the grease injection cavity (13), and the push rod (2) slides back and forth in the slide groove (17) to adjust the space occupied by the push rod (2) in the grease injection cavity (13); A connecting groove (12) is provided on the inner wall of the slide groove (17), a first channel (11) communicating with the connecting groove (12) and the grease storage chamber (61) is provided on the housing (1), and a second channel (21) communicating with the connecting groove (12) and the grease injection cavity (13) is provided on the push rod (2), and when the push rod (2) slides, the second channel (21) remains in communication with the connecting groove (12).

2. The automatic grease injection device for coal mining machine according to claim 1, characterized in that: The follower rod (3) abuts against the push rod (2), and a first spring (5) is provided in the grease injection cavity (13). One end of the first spring (5) abuts against the push rod (2), and the other end abuts against the inner wall of the grease injection cavity (13).

3. The automatic grease injection device for coal mining machine according to claim 1, characterized in that: A valve cavity (41) is provided at one end of the push rod (2) near the first spring (5) and inside the housing (1). The valve cavity (41) on the push rod (2) communicates with the second channel (21) and the grease injection cavity (13). A third channel (14) communicating with another valve cavity (41) is provided on the inner wall of the grease injection cavity (13). The third channel (14) is communicated with the grease injection pipeline (7) through the valve cavity (41). The one-way valve (4) includes a second spring (43) and a valve ball (42) located in the valve cavity (41). One end of the second spring (43) abuts against the valve ball (42), and the other end abuts against the inner wall of the valve cavity (41). The valve ball (42) can close the second channel (21) or the third channel (14) under the thrust of the second spring (43).

4. The automatic grease injection device for coal mining machine according to claim 3, characterized in that: The valve cavity (41) is internally threadedly connected to a coaxial valve cover (44), a coaxial through hole (441) is provided on the valve cover (44), and one end of the second spring (43) is in contact with the valve cover (44).

5. The automatic grease injection device for coal mining machine according to claim 4, characterized in that: A fat storage cylinder (6) is threadedly connected to the housing (1), and the fat storage chamber (61) is arranged in the fat storage cylinder (6).

6. The automatic grease injection device for coal mining machine according to claim 5, characterized in that: A sealing cover (62) is slidably provided in the grease storage chamber (61), and an air vent (63) is provided at one end of the grease storage cylinder (6) away from the housing (1).

7. The automatic grease injection device for coal mining machine according to claim 6, characterized in that: The fat storage cylinder (6) is provided with a breathable layer (64) covering the breathable hole (63).

8. A grease injection method using the automatic grease injection device for coal mining machines according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Fixedly connect one end of the follower rod (3) to the rocker arm (8) of the coal mining machine; S2, the housing (1) of the grease injection mechanism is fixedly connected to the fixed arm (9) of the coal mining machine, and the follower rod (3) of the coal mining machine is brought into contact with the push rod (2); S3. The coal mining machine is operated normally. The rocker arm (8) of the coal mining machine starts to swing, driving the follower rod (3) to rotate. The follower rod (3) pushes the push rod (2) to slide, and the grease is injected into the coal mining machine.

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