CN215000888U

CN215000888U - Shaft extension end cover lubricating structure and variable-frequency speed regulation all-in-one machine

Info

Publication number: CN215000888U
Application number: CN202120854651.2U
Authority: CN
Inventors: 李云飞; 郇正泽; 王恒
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-12-03
Anticipated expiration: 2031-04-23

Abstract

The utility model relates to an end cover lubricating structure and Variable Frequency Speed Governing (VFSG) all-in-one are stretched to axle, end cover lubricating structure is stretched to axle includes pivot, flange, a bearing, end cover inner cup and bearing cap, bearing cap fixed mounting covers in the end cover, form first oil storage chamber between end cover inner cup and the bearing, form the second oil storage chamber between bearing cap and the bearing, first oilhole has been seted up on the bearing cap, the second oilhole has been seted up in the end cover, the both ends of second oilhole communicate with first oilhole and first oil storage chamber respectively, the draining hole with second oil storage chamber intercommunication is seted up to the lower extreme of bearing cap, install the draining stopper that seals the draining hole on the draining hole, the oil filler point has been seted up on the up end face of flange, install the oil filler point in the oil filler point, the oil filler point is connected with first oilhole. The utility model provides a shaft extension end cover lubricating structure and Variable Frequency Speed Governing (VFSG) all-in-one can reduce the influence to end cover intensity when realizing effective lubrication to it is more convenient when filling the grease.

Description

Shaft extension end cover lubricating structure and variable-frequency speed regulation all-in-one machine

Technical Field

The utility model relates to a mining motor technical field especially relates to an end cover lubricating structure is stretched to axle to and stretch end cover lubricating structure mining flame proof and safe type Variable Frequency Speed Governing (VFSG) all-in-one of essence including this axle.

Background

The mining motor is suitable for operation under the underground environment condition of a coal mine, the mine environment is humid, the relative humidity can reach 98 percent, and water or flammable and explosive gas exists, so that the mining motor is required to have good sealing property. Meanwhile, the bearing of the mining motor needs to have good lubrication, otherwise, the rotation of the rotor of the motor is not smooth enough, the bearing is dry and rough faster even due to the reason of large load during working, the rotor rotates under the condition of larger resistance, and even the rotor shaft is scratched and rubbed with a bearing cover, a machine base and the like, so that serious consequences are caused, and therefore, the bearing is lubricated during use and maintenance of the mining motor. In consideration of the requirement on the sealing property of the mining motor, the conventional bearing lubrication mode of the shaft extension end cover of the mining explosion-proof and intrinsically safe variable-frequency speed-regulating integrated motor is that an oil hole and an oil drain hole are directly drilled at the outer end of a front bearing end cover, and an oil injection chamber is formed outside a front bearing. Through oil filler point, oiling room and oil drain hole, establish the lubricated grease oil circuit for in the lubricated grease can enter into the oiling room from the oil filler point, the lubrication to the bearing is realized, and waste oil can spill in the oil drain hole. When lubricating grease is filled and replaced, the end cover does not need to be detached for oil replacement and oil filling, good sealing of the mining motor can be guaranteed, and good lubrication of the bearing can be achieved.

However, the strength of the end cover is affected by drilling the oil filling hole and the oil drain hole on the bearing end cover of the mining motor, so that the mining motor is damaged when in use, and the oil filling operation is inconvenient when the space outside the end cover is small.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a shaft extension end cover lubricating structure when realizing effective lubrication, can reduce the influence to end cover intensity to it is more convenient when filling the grease.

In order to achieve the above object, the utility model provides a shaft extension end cover lubricating structure, which comprises a rotating shaft, a flange arranged on a motor shell, a bearing, an end cover inner cover and a bearing cover arranged on the rotating shaft, wherein the end cover inner cover is provided with an end cover outer cover, the bearing cover is fixedly arranged on the end cover inner cover, the bearing cover and the end cover inner cover are both in rotary sealing connection with the rotating shaft and enclose into a bearing chamber, the bearing is positioned in the bearing chamber, a first oil chamber is formed between the end cover inner cover and the bearing, a second oil chamber is formed between the bearing cover and the bearing, the bearing cover is provided with a first oil hole, the end cover inner cover is provided with a second oil hole, two ends of the second oil hole are respectively communicated with the first oil hole and the first oil chamber, and the lower end of the bearing cover is provided with an oil drainage hole communicated with the second oil chamber, install the closure on the draining hole the draining stopper in draining hole, the bearing cap is located the through-hole of flange, the oil filler point has been seted up on the up end of flange, install the oiling pole in the oiling hole, the upper end of oiling pole is located the upper end opening part of oiling hole, the lower extreme of oiling pole with first oilhole is connected.

In one embodiment, an oil cup is mounted to the upper end of the oil filler rod.

In one embodiment, the oil filling hole is provided with an oil filling plug for closing an opening at the upper end of the oil filling hole.

In one embodiment, the oil plug is a nylon plug.

In one embodiment, the bearing cap is coupled to the shaft through a bearing isolator.

In one embodiment, two O-ring seals are disposed between the bearing cap and the end cap inner cap, and a junction of the first oil hole and the second oil hole is located between the two O-ring seals.

In one embodiment, the diameter of the through hole of the flange is larger than the outer diameter of the end cover outer cover, an installation groove is formed in the outer end face of the end cover outer cover, and the lower end of the oil filling rod penetrates through the installation groove and then is in sealing connection with the first oil hole.

In one embodiment, the oil filling hole formed in the flange is inclined such that an upper end opening of the oil filling hole is located at a corner of an upper end of the flange.

In one embodiment, the number of the oil holes formed in the flange is two, two oil holes are symmetrically arranged, an oil rod is mounted in each oil hole, the number of the first oil holes formed in the bearing cover and the number of the second oil holes formed in the end cover are two, each oil rod is communicated with one first oil hole, each first oil hole is communicated with one second oil hole, and each second oil hole is communicated with the first oil chamber.

The utility model is different from the prior art in that, the utility model provides a shaft extension end cover lubrication structure can realize the oil circuit connection of flange to bearing cap by setting up the oil filler point on the flange up end, installs the oil filler rod in the oil filler point, and through setting up the first oilhole on the bearing cap, cover in the end cover and set up the second oilhole that communicates the first oilhole and first oil storage chamber, can make when carrying out the oiling operation, directly from the upper end oiling of flange, the oiling operation is simple and convenient; lubricating grease enters the first oil storage chamber through the oil filling rod, the first oil hole and the second oil hole and then automatically enters the bearing along with the rotation of the bearing, so that the bearing is effectively lubricated; and the oiling oil circuit passes through the formation of oiling pole, first oilhole and second oilhole, can reduce the influence to the intensity of end cover enclosing cover and end cover inner cup for the motor is more suitable for the industrial and mining environment. Therefore, the utility model provides a shaft extension end cover lubricating structure can reduce the influence to end cover intensity when realizing effective lubrication to it is more convenient when the filling grease.

Another object of the utility model is to provide a mining flame proof and safe type Variable Frequency Speed Governing (VFSG) all-in-one of essence can reduce the influence to end cover intensity when realizing effective lubrication to it is more convenient when the filling grease.

In order to achieve the above purpose, the technical solution of the present invention is realized as follows:

a mining explosion-proof and intrinsically safe variable-frequency speed regulation all-in-one machine comprises the shaft extension end cover lubricating structure in the embodiment.

The mining explosion-proof and intrinsically safe frequency conversion speed regulation all-in-one machine and the shaft extension end cover lubricating structure have the same technical advantages to the prior art, and are not repeated herein.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a cross-sectional view of a shaft-extension end cap lubrication structure according to an embodiment of the present invention;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B of FIG. 1;

FIG. 4 is an enlarged view at C of FIG. 1;

FIG. 5 is a front view of the mining flameproof and intrinsically safe variable frequency speed control all-in-one machine provided by the utility model;

description of reference numerals:

1-a rotating shaft; 2-a flange; 3-a bearing; 4-inner cover of end cover; 5-a bearing cap; 6-end cover outer cover; 7-a first oil reservoir; 8-a second oil reservoir; 9-a first oil hole; 10-a second oil hole; 11-oil drainage holes; 12-an oil drain plug; 13-a filler rod; 14-oil cup; 15-oil plug; 16-a bearing isolator; 17-O-ring seals; 18-a mounting groove; 19-motor housing.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides a shaft extension end cap lubrication structure according to a basic embodiment, which includes a rotating shaft 1, a flange 2 installed on a motor housing 19, and a bearing 3, an end cap inner cap 4, and a bearing cap 5 installed on the rotating shaft 1. The end cover inner cover 4 is rotatably installed on the rotating shaft 1 through structures such as a bearing bush, the bearing cover 5 is fixedly installed on the end cover inner cover 4 and rotatably sleeved on the rotating shaft 1, and sealing structures are arranged among the end cover inner cover 4, the bearing cover 5 and the rotating shaft 1. An end cover outer cover 6 is installed on the end cover inner cover 4, and the end cover inner cover 4 and the end cover outer cover 6 close the opening of the end part of the motor.

The bearing cover 5, the end cover inner cover 4 and the rotating shaft 1 enclose a bearing chamber, the bearing 3 is installed in the bearing chamber, the inner ring of the bearing 3 is fixedly sleeved on the rotating shaft 1, and the outer ring of the bearing 3 is fixed on the end cover inner cover 4. As shown in fig. 1, a first oil reservoir chamber 7 is formed between the end cover inner cover 4 and the bearing 3, and a second oil reservoir chamber 8 is formed between the bearing cover 5 and the bearing 3, that is, the bearing 3 divides the bearing chamber into the first oil reservoir chamber 7 and the second oil reservoir chamber 8.

As shown in fig. 3, a first oil hole 9 is opened in the bearing cap 5, a second oil hole 10 is opened in the cap inner cap 4, and both ends of the second oil hole 10 communicate with the first oil hole 9 and the first oil storage chamber 7, respectively. As shown in fig. 4, a drain hole 11 communicating with the second oil storage chamber 8 is formed in the lower end of the bearing cover 5, and a drain plug 12 for closing the drain hole 11 is mounted on the drain hole 11.

As shown in fig. 1 and 5, the flange 2 is integrally of an annular structure, the bearing cap 5 is located in the through hole of the flange 2, an oil filler point is provided on the upper end face of the flange 2, an upper end opening of the oil filler point is located on the upper end face of the flange 2, a lower end opening of the oil filler point faces the end face of the bearing cap 5, an oil filler rod 13 is installed in the oil filler point, the oil filler rod 13 is of a tubular structure, one end of the oil filler rod 13 is located at the upper end opening of the oil filler point, and as shown in fig. 1 and 3, the other end of the oil filler rod 13 is connected with the first oil hole 9 on the bearing cap 5 after passing through the oil filler point.

When the shaft extension end cover lubricating structure provided by the basic embodiment works normally, the rotating shaft 1 drives the inner ring and the rolling body of the bearing 3 mounted on the rotating shaft to rotate, lubricating grease stored in the first oil storage chamber 7 and the second oil storage chamber 8 is sucked into the bearing 3, and effective lubrication of the bearing 3 is realized along with splashing of the lubricating grease; when lubricating grease needs to be filled, the lubricating grease is filled into a lubricating rod 13 arranged in a lubricating hole through a device such as an oil gun, the lubricating grease enters a first oil storage chamber 7 through the bearing cover lubricating rod 13, a first oil hole 9 on a bearing cover 5 and a second oil hole 10 on an end cover inner cover 4, so that the oil filling operation can be realized, and the filled lubricating grease generally occupies three quarters of the volume of the oil storage chamber in order to achieve a better lubricating effect; waste oil is deposited near the oil drain hole 11 from the second oil storage chamber 8 outside the bearing 3, and the oil drain plug 12 is opened to discharge the waste oil from the oil drain hole 11. The oiling oil path of the shaft extension end cover lubricating structure provided by the embodiment is formed by the oiling rod 13, the first oil hole 9 and the second oil hole 10, so that the influence on the strength of the end cover outer cover 6 and the end cover inner cover 4 can be reduced, and the motor is more suitable for industrial and mining environments.

Generally, mining motor docks with equipment through flange 2, and current mining motor need dismantle the motor when the oiling get off the utility model discloses in, through the oil circuit on oil filler rod 13 connection flange 2 and the bearing cap 5, can realize the function that need not dismantle the motor just can the oiling, the oiling is more convenient.

On the basis of the above embodiment, it is preferable that an oil cup 14 is mounted on the upper end of the oil filler rod 13, as shown in fig. 2.

The axle that this embodiment provided stretches end cover lubrication structure oil circuit is clear, as shown by thicker black solid line in fig. 1, lubricating grease gets into from oil cup 14 of the upper end of oiling pole 13, through oiling pole 13, first oilhole 9, during second oilhole 10 gets into first oil storage room 7, waste oil is through second oil storage room 8, draining hole 11 discharges, upper end oiling promptly, the lower extreme oil extraction, the oil circuit is unobstructed, waste oil can automatic discharge during the oiling, waste oil discharges and can realize the better lubrication of bearing 3, and service life is prolonged, prevent that bearing 3 temperature is too high.

In the present invention, it is further preferable that, as shown in fig. 2, an oil filler plug 15 for closing an upper end opening of the oil filler hole is installed on the oil filler hole. The filler plug 15 is preferably a nylon plug. By installing the filler plug 15 at the upper end of the filler hole, it is possible to prevent the oil cup 14 or the filler rod 13 located in the filler hole from being clogged with foreign matters falling into the filler hole or contaminating the grease.

Bearing cap 5 among the prior art generally is the skeleton oil blanket with the sealed of pivot 1, realizes the sealed of oil storage chamber through the skeleton oil blanket, nevertheless because pivot 1 can produce more heat when rotatory, leads to the overtemperature fault, consequently the utility model discloses a preferred embodiment, as shown in fig. 3, fig. 4, bearing cap 5 through bearing isolator 16 with pivot 1 is connected. In the present embodiment, by connecting the rotating shaft 1 and the bearing cap 5 by using the bearing isolator 16, oil leakage can be prevented while ensuring normal rotation of the rotating shaft 1, and heat generated when the rotating shaft 1 rotates can be effectively reduced, ensuring the lubricating effect of the bearing 3.

Further preferably, the bearing isolator 16 is preferably an IP67 waterproof grade bearing isolator to achieve effective water resistance.

In the present invention, in order to achieve good sealing at the joint of the first oil hole 9 and the second oil hole 10, it is preferable that, as shown in fig. 3, two O-rings 17 are provided between the bearing cap 5 and the end cap inner cover 4, and the joint of the first oil hole 9 and the second oil hole 10 is located between the two O-rings 17. Specifically, two annular grooves are formed in the joint surface of the end cover inner cover 4 and the bearing cover 5, the upper end opening of the second oil hole 10 is located between the two annular grooves, and an O-ring 17 is disposed in each annular groove. More preferably, both annular grooves are provided around the axis of the end cover inner cover 4, so that the sealed connection between the bearing cap 5 and the end cover inner cover 4 can be achieved while sealing the junction of the first oil hole 9 and the second oil hole 10.

As shown in fig. 5, in a preferred embodiment of the present invention, the diameter of the through hole of the flange 2 is larger than the outer diameter of the end cover outer cover 6, a mounting groove 18 is formed on the outer end surface of the end cover outer cover 6, and the lower end of the oil injection rod 13 passes through the mounting groove 18 and then is connected to the first oil hole 9 in a sealing manner. Through set up mounting groove 18 on end cover enclosing cover 6, can realize the fixed and protection of oiling pole 13 through mounting groove 18 to make axle stretch end cover lubricating structure more reliable and stable.

In order to facilitate oil injection, it is preferable that the oil injection hole formed in the flange 2 is inclined such that an upper end opening of the oil injection hole is located at a corner of an upper end of the flange 2, as described with reference to fig. 5.

On the basis of the above embodiment, it is further preferable that, as shown in fig. 5, the number of the oil holes opened in the flange 2 is two, and the two oil holes are symmetrically arranged, that is, the upper openings of the two oil holes are respectively located at the left corner and the right corner of the flange 2. All install the oiling pole 13 in every oiling hole, the quantity of the first oilhole 9 of seting up on the bearing cap 5 with the quantity of the second oilhole 10 of seting up on the end cover inner cup 4 is two, every oiling pole 13 all with one first oilhole 9 intercommunication, every first oilhole 9 all communicates with a second oilhole 10, every second oilhole 10 all communicates with first oil storage chamber 7. In this embodiment, through setting up two oiling systems for all can carry out the oiling about the axle extension end cover lubricating structure, convenient operation does not receive the restriction of equipment use installation environment.

The axle that provides in the above-mentioned embodiment stretches end cover lubricating structure technical concept the same, the utility model also provides a mining flame proof and safe type Variable Frequency Speed Governing (VFSG) all-in-one of essence, this VFSG all-in-one include the axle that above-mentioned embodiment stretches end cover lubricating structure.

In the technical scheme provided by the utility model, the oil injection port is arranged on the upper side of the edge of the flange 2, the oil drainage port is arranged on the lower side of the bearing cap 5, so that the oil filling and oil drainage are convenient, no pollution is generated, the oil gun is used for oil injection, the oil quantity can be filled according to the requirement, and the waste and the excessive addition are avoided; the oil injection rod 13 is used as an oil path to realize the oil path connection from the flange 2 to the bearing cap 5, the oil path connection between the bearing cap 5 and the end cap inner cap 4 is established, an O-shaped sealing ring 17 is used for sealing, the oil path is clear, and the leakage of lubricating grease is avoided; an oil inlet chamber and an oil storage chamber are formed in a bearing chamber of the end cover inner cover 4, so that lubricating grease directly enters the inner side of the bearing 3 and automatically enters the bearing for lubrication along with the rotation of the bearing 3; the bearing isolator 16 with the IP67 waterproof grade is used between the rotating shaft 1 and the bearing cover 5, so that the normal rotation of the rotating shaft 1 can be ensured, oil leakage can be prevented, the heat generated by rotation is effectively reduced compared with a mode of directly installing a framework oil seal, and water can be effectively prevented.

In summary, the shaft extension end cover lubricating structure and the frequency conversion speed regulation integrated machine provided by the utility model can simplify the operation of oil injection; the oil way is clearer and is not easy to leak, the oil injection amount is controllable, and pollution and waste are prevented; the strength of the end cover part is ensured; lubricating grease enters the inner side wall of the bearing 3 and can quickly enter the bearing 3 for lubrication; an oil storage chamber is formed at the inner side of the bearing chamber of the end cover inner cover 4, so that lubricating grease automatically enters the bearing for lubrication, the oil change times are reduced, the workload is reduced, and dirt is prevented from entering the bearing chamber to damage the bearing structure; through setting up oiling mouth and draining port, can realize not dismantling the oil change, also can realize the recovery of waste oil.

In the above description of the present specification, the terms "fixed," "mounted," "connected," or "connected," and the like, are to be construed broadly unless otherwise expressly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless the specification explicitly defines otherwise, those skilled in the art can understand the specific meaning of the above terms in the present invention according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "central", "longitudinal", "transverse", "clockwise" or "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings of the present specification, it is for the purpose of facilitating the explanation of the invention and simplifying the description, and it is not intended to state or imply that the devices or elements involved must be in the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be interpreted or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, therefore, to cover module compositions, equivalents, or alternatives falling within the scope of these claims.

Claims

1. The utility model provides a shaft extension end cover lubricating structure, includes pivot (1), installs flange (2) on motor housing (19) and installs bearing (3), end cover inner cup (4) and bearing cap (5) on pivot (1), install end cover enclosing cover (6) on end cover inner cup (4), its characterized in that, bearing cap (5) fixed mounting be in on end cover inner cup (4), bearing cap (5) with end cover inner cup (4) all rotate sealing connection with pivot (1) and enclose into the bearing room, bearing (3) are located in the bearing room, form first oil storage chamber (7) between end cover inner cup (4) and bearing (3), form second oil storage chamber (8) between bearing cap (5) and bearing (3), first oilhole (9) have been seted up on bearing cap (5), the end cover is characterized in that a second oil hole (10) is formed in the end cover inner cover (4), two ends of the second oil hole (10) are communicated with the first oil hole (9) and the first oil storage chamber (7) respectively, an oil drainage hole (11) communicated with the second oil storage chamber (8) is formed in the lower end of the bearing cover (5), a seal is installed in the oil drainage hole (11), an oil drainage plug (12) of the oil drainage hole (11) is located in a through hole of the flange (2), an oil filling hole is formed in the upper end face of the flange (2), an oil filling rod (13) is installed in the oil filling hole, the upper end of the oil filling rod (13) is located at an upper end opening of the oil filling hole, and the lower end of the oil filling rod (13) is connected with the first oil hole (9).

2. The shaft-extension-end-cap lubrication structure according to claim 1, wherein an oil cup (14) is mounted on an upper end of the oil filler rod (13).

3. The shaft-extension-end-cap lubricating structure according to claim 1, wherein an oil filler plug (15) for closing an upper-end opening of the oil filler hole is mounted on the oil filler hole.

4. The shaft-extension-end-cap lubrication structure according to claim 3, wherein the oil filler plug (15) is a nylon plug.

5. The shaft-extension-end-cap lubrication structure according to claim 1, wherein the bearing cap (5) is connected to the rotating shaft (1) through a bearing isolator (16).

6. The shaft-extension-end-cover lubrication structure according to claim 1, wherein two O-ring seals (17) are provided between the bearing cover (5) and the end-cover inner cover (4), and a junction of the first oil hole (9) and the second oil hole (10) is located between the two O-ring seals (17).

7. The shaft extension end cover lubricating structure according to any one of claims 1-6, wherein the aperture of the through hole of the flange (2) is larger than the outer diameter of the end cover outer cover (6), an installation groove (18) is formed on the outer end face of the end cover outer cover (6), and the lower end of the oil injection rod (13) penetrates through the installation groove (18) and then is connected with the first oil hole (9) in a sealing manner.

8. The shaft-extension-end-cap lubrication structure according to claim 7, wherein the oil filler hole provided in the flange (2) is disposed obliquely such that an upper end opening of the oil filler hole is located at a corner of an upper end of the flange (2).

9. The shaft-extension end cover lubricating structure according to claim 8, wherein the number of oil holes formed in the flange (2) is two, two oil holes are symmetrically arranged, an oil filling rod (13) is installed in each oil hole, the number of first oil holes (9) formed in the bearing cover (5) and the number of second oil holes (10) formed in the end cover inner cover (4) are two, each oil filling rod (13) is communicated with one first oil hole (9), each first oil hole (9) is communicated with one second oil hole (10), and each second oil hole (10) is communicated with the first oil storage chamber (7).

10. A mining flame-proof and intrinsically safe variable-frequency speed regulation all-in-one machine is characterized by comprising the shaft extension end cover lubricating structure as claimed in any one of claims 1 to 9.