Lubricating system of numerical control machine tool

Abstract

The utility model discloses a numerically-controlled machine tool lubricating system, which relates to the technical field of numerically-controlled machine tools and comprises a track, a sliding block and a ball. The sliding block comprises a main body and an insertion block; the main body is transversely inserted into the slot of the insertion block; a first cambered surface is arranged on the side wall of an inner cavity of the main body, the sliding block is provided with a second cambered surface matched with the first cambered surface, the first cambered surface and the second cambered surface are matched with each other and form a clamping groove, and the ball is clamped in the clamping groove; an oil supply channel is arranged in the sliding block and comprises an outer flow channel arranged in the main body and an inner flow channel arranged in the insertion block, the inner flow channel comprises a main flow channel and a branch flow channel which are communicated with each other, and the branch flow channel is communicated with the clamping groove. The oil supply channel is arranged in the sliding block, lubricating oil is supplied to the balls through the oil supply channel, the problem of hair falling of the brush is avoided, the failure rate is low, the service life is long, and the reliability is excellent. The inserting blocks and the inserting grooves are connected in an inserted mode, the balls can be conveniently installed, meanwhile, the structure of the oil supply channel is greatly simplified, and the oil supply channel is made to have excellent workability.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control machine tool technical field, concretely relates to a numerical control machine tool lubricating system. BACKGROUND

[0002] The guide rail usually includes a track and a sliding block, usually has a ball guide rail, a roller guide rail and the like, and is a structure for guiding on a numerical control machine tool.

[0003] The ball guide rail further includes balls arranged between the track and the sliding block, and the balls are abraded after long-time use, which reduces the sliding fluency of the sliding block; meanwhile, the balls become smaller due to abrasion, which increases the gap between the sliding block and the track and further increases the shaking amplitude of the sliding block and reduces the guiding accuracy. In order to slow down the abrasion speed of the balls, the balls need to be coated with lubricating oil; in the traditional technology, there is a scheme of coating the lubricating oil on the track by using a brush; after the balls contact the track, the surface of the balls will be attached with the lubricating oil. However, the bristles of the brush are easy to fall off, and the fallen bristles attached on the track will reduce the moving fluency of the sliding block and accelerate the abrasion speed of the balls. SUMMARY

[0004] In order to overcome the problem of "low reliability of coating lubricating oil on the ball guide rail by using a brush" in the above background technology, the utility model provides a numerical control machine tool lubricating system.

[0005] The utility model adopts the technical scheme that:

[0006] A numerical control machine tool lubricating system, comprising a track, a sliding block buckled with the track, and balls arranged between the track and the sliding block; a side recess is arranged on the side wall of the track, and the top and bottom outer edges of the side recess are respectively provided with inclined surfaces; the sliding block comprises a main body and a plug; the main body is transversely inserted into the insertion slot of the plug; a first arc surface is arranged on the inner cavity side wall of the main body, and a second arc surface matched with the first arc surface is arranged on the sliding block; the first arc surface and the second arc surface are matched with each other and form a clamping groove, and the balls are clamped in the clamping groove; the joint between the first arc surface and the second arc surface is located on the inner side of the median plane of the inclined surface; an oil supply channel is arranged in the sliding block, and the oil supply channel comprises an outer flow channel arranged in the main body and an inner flow channel arranged in the plug; the inner flow channel comprises a main flow channel and a branch flow channel which are communicated with each other; the branch flow channel is communicated with the clamping groove, and the end opening of the branch flow channel is arranged on the second arc surface.

[0007] As a further optimization scheme of the utility model, the main flow channel is horizontally arranged, the branch flow channel is vertically arranged, and the end of the main flow channel and the middle of the branch flow channel are arranged in a T shape.

[0008] As a further optimization scheme of the utility model, the inner flow channel still includes the compensation flow channel which is vertically arranged, the compensation flow channel is in vertical communication with the main flow channel, the compensation flow channel is in communication with the clamping groove, and the end opening of the compensation flow channel is arranged on the second arc surface.

[0009] As a further optimization scheme of the utility model, the connecting position of the first arc surface and the second arc surface is provided with an oil storage groove, and the oil storage groove is arranged on the main body and / or the surface of the plug-in block.

[0010] As a further optimization scheme of the utility model, the compensation flow channel is located between the shunt channel and the oil storage groove.

[0011] As a further optimization scheme of the utility model, the end surface of the plug-in block away from the second arc surface is sealed and pressed by a sealing ring through the side wall of the plug-in groove.

[0012] As a further optimization scheme of the utility model, the end surface of the plug-in block away from the second arc surface is provided with a threaded hole, the outer side wall of the main body is provided with a countersunk hole matched with the threaded hole, a mounting bolt is inserted and arranged in the countersunk hole, and the end of the mounting bolt is inserted into the threaded hole and connected through threads.

[0013] As a further optimization scheme of the utility model, the countersunk hole is provided with a plurality of countersunk holes and is arranged on the outer periphery of the main flow channel, and a connecting pipe for injecting lubricating oil is sealingly inserted into the outer end of the main flow channel.

[0014] As a further optimization scheme of the utility model, the connecting pipe is in L shape and opens upward.

[0015] As a further optimization scheme of the utility model, the compensation flow channel is located above the main flow channel, the compensation flow channel is in communication with the clamping groove located above the main flow channel, the inner flow channel further includes an inclined flow channel, the bottom end of the flow channel is in communication with the lower part of the shunt channel, the top end of the flow channel is in communication with the main flow channel, and the top end of the flow channel is located directly below the compensation flow channel.

[0016] As a further optimization scheme of the utility model, the compensation flow channel is located above the main flow channel, the compensation flow channel is in communication with the clamping groove located above the main flow channel, the inner flow channel further includes an inclined flow channel, the bottom end of the flow channel is in communication with the lower part of the shunt channel, the top end of the flow channel is in communication with the main flow channel, and the top end of the flow channel is located directly below the compensation flow channel.

[0017] (1) The utility model has simple structure and reliable function, the oil supply channel is arranged in the sliding block, lubricating oil is supplied to the ball through the oil supply channel, the problem of hair loss of the brush is avoided, the failure rate is low, the service life is long, and excellent reliability is achieved.

[0018] (2) The plug-in block and the plug-in groove are inserted with each other, the convenient installation of the ball can be realized, the structure of the oil supply channel is greatly simplified, and the oil supply channel has excellent machinability.

[0019] (3) The inner flow channel comprises a main flow channel, a branch flow channel and a compensation flow channel, the compensation flow channel supplies oil to the upper clamping groove by capillary action, thereby slowing down the problem of insufficient oil supply of the upper ball.

[0020] (4) The joint at the connecting position of the first arc surface and the second arc surface is located inside the median plane of the inclined surface, so that the ball will be as close as possible to the side of the first arc surface close to the plug under the support of the inclined surface, thereby reducing the frequency of contact between the ball and the joint, further slowing down the wear speed of the ball and improving the use fluency and service life of the utility model.

[0021] (5) The top end of the converging channel is located directly below the compensation flow channel, and the bottom end is Y-shapedly communicated with the lower part of the branch flow channel, so that the debris particles or dust particles falling into the bottom end of the compensation flow channel or the main flow channel will further flow downward along the converging channel, thereby avoiding the problem of blockage of the compensation flow channel and / or the main flow channel.

[0022] (6) The upper clamping groove is provided with an oil storage groove, and the oil storage groove is used to slow down the problem of insufficient oil supply of the upper ball. BRIEF DESCRIPTION OF DRAWINGS

[0023] The present application will be further described below in conjunction with the drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0025] Figure 2 It is a schematic diagram of the track structure;

[0026] Figure 3 It is a schematic diagram of the plug structure;

[0027] Figure 4 It is a schematic diagram of the setting position and structure of the clamping groove and the screw hole;

[0028] Figure 5 It is a schematic diagram of the setting position and structure of the inclined surface, the ball and the branch flow channel;

[0029] Figure 6 It is a schematic diagram of the setting position and structure of the compensation flow channel;

[0030] Figure 7 It is a schematic diagram of the setting position and structure of the converging channel.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] In the drawings,

[0033] 1, track; 11, side groove; 111, inclined surface; 1111, median plane;

[0034] 2, slider; 21, main body; 210, slot; 211, outer flow channel; 2111, sealing ring; 212, first arc surface; 22, plug; 220, clamping groove; 2201, oil storage groove; 221, inner flow channel; 2211, main flow channel; 2212, branch flow channel; 2213, compensation flow channel; 2214, confluence channel; 222, second arc surface; 223, screw hole; 2231, mounting bolt;

[0035] 3, ball;

[0036] 4, connecting pipe. DETAILED DESCRIPTION

[0037] According to the above structural features of the application, the embodiments of the application are further described as follows:

[0038] Referring to Figures 1-2 , the embodiment provides a numerical control machine tool lubrication system, which comprises a track 1, a slider 2 buckled with the track 1, and a ball 3 arranged between the track 1 and the slider 2. The slider 2 can reciprocate along the length direction of the track 1, and the ball 3 can roll to reduce the friction between the track 1 and the slider 2.

[0039] Referring to Figures 1-2 , the vertical section of the track 1 is in the shape of an I-beam. The side wall of the track 1 is provided with a side groove 11, and the outer edge positions of the top and bottom surfaces of the side groove 11 are respectively provided with inclined surfaces 111. The ball 3 is pressed and connected on the inclined surfaces 111 and rolls, thereby avoiding the direct contact between the slider 2 and the track 1 to reduce the friction between the slider 2 and the track 1.

[0040] Referring to Figure 1 and Figure 2 , the slider 2 comprises a main body 21 and a plug 22, and the main body 21 is transversely inserted into the slot 210 of the plug 22. The slot 210 is a blind hole and is arranged at the inner side wall position of the main body 21. The inner cavity side wall of the main body 21 is provided with a first arc surface 212, the slider 2 is provided with a second arc surface 222 matched with the first arc surface 212, the first arc surface 212 and the second arc surface 222 are matched with each other and form a clamping groove 220, and the ball 3 is clamped in the clamping groove 220.

[0041] Referring to Figure 1 and Figure 3The utility model discloses the assembly, first, the plug -in block 22 is transversely placed in the inner chamber of main body 21, then the end of plug -in block 22 is inserted in the slot 210, then the ball 3 is placed in the first camber 212 or second camber 222, then further insert the middle of plug -in block 22 in the slot 210, make the first camber 212 or second camber 222 from both sides buckle the ball 3, to avoid the ball 3 and come out. When the inner chamber width of main body 21 is narrow, then need to adopt the plug -in block 22 of shorter length, to ensure that the plug -in block 22 can be transversely placed in the inner chamber of main body 21, then further need the depth of the slot 210 of more shallow to adapt the length of plug -in block 22, therefore the slot 210 is blind hole shape instead of through -hole shape.

[0042] Referring to Figure 3 With Figure 5 The joint of the first camber 212 and the second camber 222 is located on the inner side of the median plane 1111 of the inclined surface 111, then under the support of the inclined surface 111, the ball 3 can be as far as possible to adhere to the side of the first camber 212 close to the plug -in block 22 (i.e. the part of the first camber 212 located on the opposite side of the inclined surface 111) (when the utility model works), to reduce the frequency of the contact of the ball 3 and the joint (of the first camber 212 and the second camber 222), further slow down the wear speed of the ball 3, improve the use fluency and life of the utility model.

[0043] Referring to Figure 1 With Figure 3 The sliding block 2 is equipped with an oil supply channel, and the oil supply channel includes an outer flow channel 211 arranged in the main body 21 and an inner flow channel 221 arranged in the plug -in block 22, and the inner flow channel 221 and the outer flow channel 211 are in communication with each other, so that the user can inject lubricating oil to the position of the ball 3 regularly, to reduce the wear of the ball 3 and improve the fluency and service life of the sliding block 2.

[0044] Referring to Figures 3-5 The inner flow channel 221 includes a main flow channel 2211 and a branch flow channel 2212 in communication with each other, the branch flow channel 2212 is in communication with the clamping groove 220, and the end opening of the branch flow channel 2212 is arranged on the second camber 222. The main flow channel 2211 is arranged along the length direction of the plug -in block 22, and the branch flow channel 2212 is arranged along the width direction of the plug -in block 22; one end of the main flow channel 2211 is in communication with the outer flow channel 211, and the other end is in communication with the branch flow channel 2212. The lubricating oil is injected into the clamping groove 220 through the outer flow channel 211, the main flow channel 2211 and the branch flow channel 2212 in sequence, and then adheres to the surface of the ball 3, so as to increase the rotation fluency of the ball 3.

[0045] Referring to Figure 1 , Figure 3 With Figure 5The main flow channel 2211 is horizontally arranged, the branch flow channel 2212 is vertically arranged, and the end of the main flow channel 2211 is arranged in a T shape with the middle part of the branch flow channel 2212. The left and right side walls of the inner cavity of the same sliding block 2 are respectively inserted with an insertion block 22, the upper and lower sides of the same insertion block 22 are respectively provided with a clamping groove 220, and the same clamping groove 220 is provided with a plurality of rolling balls 3 arranged in a straight line, so that the branch flow channel 2212 is used for distributing the lubricating oil in the main flow channel 2211 to the upper and lower clamping grooves 220 (two rows of rolling balls 3 positions).

[0046] With reference to Figure 3 The end opening of the branch flow channel 2212 is arranged on the second arc surface 222, and the rolling balls 3 mainly contact the first arc surface 212, so that the frequency of the rolling balls 3 contacting the sharp part of the end opening of the branch flow channel 2212 is low, thereby slowing down the wear speed of the rolling balls 3, improving the smoothness of the sliding block 2 sliding, and prolonging the service life of the utility model.

[0047] With reference to Figure 6 The inner flow channel 221 further comprises a vertical compensation flow channel 2213, and the compensation flow channel 2213 is vertically communicated with the main flow channel 2211. The compensation flow channel 2213 is communicated with the clamping groove 220, and the end opening of the compensation flow channel 2213 is arranged on the second arc surface 222; similarly, the rolling balls 3 mainly contact the first arc surface 212, so that the frequency of the rolling balls 3 contacting the sharp part of the end opening of the compensation flow channel 2213 is low, thereby slowing down the wear speed of the rolling balls 3, improving the smoothness of the sliding block 2 sliding, and prolonging the service life of the utility model.

[0048] With reference to Figure 6 The compensation flow channel 2213 is located above the main flow channel 2211 and is vertically arranged. The top end of the compensation flow channel 2213 is communicated with the clamping groove 220 located above the main flow channel 2211. Since the two clamping grooves 220 on the same side are arranged on the upper and lower sides of the main flow channel 2211, under the action of gravity, more lubricating oil is distributed to the lower clamping groove 220 and less lubricating oil is distributed to the upper clamping groove 220, causing the problem of insufficient lubricating oil supply for the rolling balls 3 in the upper clamping groove 220; in order to avoid such problems, the utility model adds the compensation flow channel 2213, and the lubricating oil in the main flow channel 2211 flows into the clamping groove 220 located above under the capillary action of the compensation flow channel 2213, thereby increasing the oil supply of the rolling balls 3 located above.

[0049] With reference to Figure 6 And Figure 7Since the compensation channel 2213 is located between the branch channel 2212 and the second arc surface 222, the top opening of the compensation channel 2213 is located at the opposite bottom of the slot 220. Debris particles generated after wear of the inclined surface 111 / ball 3 / first arc surface 212 / second arc surface 222, or accidentally entering dust particles, will fall and accumulate at the bottom of the (upper) slot 220. These debris or dust particles will further fall downwards along the compensation channel 2213 and accumulate. Debris or dust particles can accumulate at the bottom of the compensation channel 2213 and / or at the connection between the compensation channel 2213 and the main channel 2211, causing blockages in both. To avoid this problem, the inner channel 221 also includes an inclined converging channel 2214. The bottom of the converging channel 2214 connects to the lower part of the branch channel 2212, and the top of the converging channel 2214 connects to the main channel 2211. The top of the converging channel 2214 is located directly below the compensation channel 2213. Therefore, after falling into the bottom of the compensation channel 2213 or the main channel 2211, these particles will flow further downwards along the converging channel 2214, preventing blockages in the compensation channel 2213 and / or the main channel 2211.

[0050] Reference Figure 6 and Figure 7 After the debris or dust particles flow downward along the confluence channel 2214, they flow into the slot 220 located below the main channel 2211 through the branch channel 2212 located below. The slot 220 opens downward. The debris or dust particles adhere to the surface of the ball 3 in the slot 220 and roll several times before falling out through the opening of the slot 220, thereby achieving discharge.

[0051] Reference Figure 5 An oil reservoir 2201 is provided at the connection point between the first arc surface 212 and the second arc surface 222. The oil reservoir 2201 is located on the surface of the main body 21 and / or the insert block 22. The oil reservoir 2201 is concave. Because the lubricating oil supply to the ball bearings 3 in the upper slot 220 is insufficient, the oil reservoir 2201 is provided. Users periodically inject excess lubricating oil into (all) slots 220. Excess lubricating oil in the lower slot 220 will drip naturally, while some excess lubricating oil in the upper slot 220 is stored in the oil reservoir 2201, and another portion overflows through the opening. The lubricating oil in the oil reservoir 2201 is used to compensate for the insufficient lubricating oil supply to the ball bearings 3 in the upper slot 220.

[0052] Reference Figure 5 and Figure 6 The compensation channel 2213 is located between the branch channel 2212 and the oil storage tank 2201, thereby avoiding structural conflict (i.e., the oil storage tank 2201 and the compensation channel 2213 are in a non-connected state).

[0053] ReferenceFigure 3 With Figure 4 The end face of the insertion block 22 away from the second arc surface 222 is sealed and pressed by the sealing ring 2111 with the side wall of the insertion slot 210, so as to avoid the problem of lubricating oil leakage through the gap between the insertion block 22 and the insertion slot 210.

[0054] Referring to Figure 3 With Figure 4 The end face of the insertion block 22 away from the second arc surface 222 is provided with a threaded hole 223, the outer side wall of the main body 21 is provided with a counterbore hole matched with the threaded hole 223, and a mounting bolt 2231 is inserted and connected in the counterbore hole. The end of the mounting bolt 2231 is inserted into the threaded hole 223 and connected through threads. The mounting bolt 2231 is used for pulling the insertion block 22, so as to fix the insertion block 22 in the insertion slot 210; and provides a pressing force for the sealing ring 2111, so as to realize the sealing of the connection position of the outer flow channel 211 and the main flow channel 2211.

[0055] Referring to the same 4, the counterbore hole is provided with a plurality of counterbore holes and is arranged on the outer periphery of the main flow channel 2211, so as to realize the displacement, so as to avoid the problem that the counterbore hole and the main flow channel 2211 are communicated to cause lubricating oil leakage, and improve the installation convenience of the mounting bolt 2231.

[0056] Referring to Figure 1 The outer end of the main flow channel 2211 is sealingly inserted with a connecting pipe 4 for injecting lubricating oil. The inner wall of the outer end of the main flow channel 2211 is provided with an internal thread, the lower end of the connecting pipe 4 is provided with an external thread, the internal thread and the external thread are screwed with each other and are sealingly connected through a sealing washer or a sealing rubber. The connecting pipe 4 is L-shaped and the opening is upward; the connecting pipe 4 is connected and communicated with an oil pump and an oil tank in the numerical control machine tool through a hose, the oil tank stores lubricating oil, and the oil pump can press the lubricating oil in the oil tank into the connecting pipe 4, and then into the outer flow channel 211, the inner flow channel 221 and the clamping groove 220.

[0057] The utility model discloses simple structure, reliable function, set up the oil supply channel in the sliding block 2, utilize the oil supply channel to supply lubricating oil to the ball 3, avoid the problem of hair loss of the brush, low failure rate, long service life, have excellent reliability.

[0058] The insertion block 22 and the insertion slot 210 are inserted with each other, which can realize the convenient installation of the ball 3, and greatly simplify the structure of the oil supply channel, so that the oil supply channel has excellent workability.

[0059] The inner flow channel 221 includes a main flow channel 2211, a branch flow channel 2212 and a compensation flow channel 2213. The compensation flow channel 2213 supplies oil to the clamping groove 220 located above by capillary action, thereby alleviating the problem of insufficient oil supply of the ball 3 located above.

[0060] The top end of the converging channel 2214 is arranged below the compensation flow channel 2213 and the bottom end is communicated with the lower part of the diverging channel 2212 in a Y shape, so that the debris particles or dust particles falling in the bottom end of the compensation flow channel 2213 or the main flow channel 2211 can further flow downward along the converging channel 2214, thereby avoiding the problem of blockage of the compensation flow channel 2213 and / or the main flow channel 2211.

[0061] The upper card slot 220 is provided with an oil storage groove 2201, which is used to alleviate the problem of insufficient oil supply of the upper ball 3.

[0062] In the description of the utility model, it should be pointed out that the directions or position relations indicated by the terms "upper", "lower", "left", "right" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model.

[0063] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "arrangement", "installation", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integral connection, can be mechanical connection, can also be electrical connection, can be direct connection, can also be connected through an intermediate medium, can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0064] In summary, for those skilled in the art, according to the guidance of the utility model, the changes, modifications, replacements, deformations made to the utility model without departing from the principles and spirits of the utility model still fall within the protection scope of the utility model.

Claims

1. A CNC machine tool lubrication system characterized by: The utility model provides a track (1), slider (2) and ball (3) are provided between track (1) and slider (2) are connected with track (1) of the utility model discloses a track and slider are connected through ball, and the track and slider are connected through ball, and the track and slider are connected through ball, The side wall of the track (1) is provided with a side groove (11), and the top and bottom surfaces of the side groove (11) are respectively provided with inclined surfaces (111). The slider (2) includes a main body (21) and an insertion block (22), the main body (21) is transversely inserted into the insertion slot (210) of the insertion block (22), the inner cavity side wall of the main body (21) is provided with a first arc surface (212), the slider (2) is provided with a second arc surface (222) matched with the first arc surface (212), the first arc surface (212) and the second arc surface (222) are matched with each other and form a clamping groove (220), and the ball (3) is clamped in the clamping groove (220). The joint between the first arc surface (212) and the second arc surface (222) is located on the inner side of the median vertical plane (1111) of the inclined surface (111). The slider (2) is provided with an oil supply channel, the oil supply channel includes an outer flow channel (211) arranged in the main body (21) and an inner flow channel (221) arranged in the insertion block (22), the inner flow channel (221) includes a main flow channel (2211) and a branch flow channel (2212) which are communicated with each other, the branch flow channel (2212) is communicated with the clamping groove (220), and the end opening of the branch flow channel (2212) is arranged on the second arc surface (222).

2. The CNC machine tool lubrication system of claim 1, wherein: The main flow channel (2211) is horizontally arranged, the branch flow channel (2212) is vertically arranged, and the end of the main flow channel (2211) is arranged in a T shape with the middle part of the branch flow channel (2212).

3. The CNC machine tool lubrication system of claim 2, wherein: The inner flow channel (221) further includes a vertical compensation flow channel (2213), the compensation flow channel (2213) is vertically communicated with the main flow channel (2211), the compensation flow channel (2213) is communicated with the clamping groove (220), and the end opening of the compensation flow channel (2213) is arranged on the second arc surface (222).

4. The CNC machine tool lubrication system of claim 3, wherein: The joint between the first arc surface (212) and the second arc surface (222) is located on the inner side of the median vertical plane (1111) of the inclined surface (111).

5. The CNC machine tool lubrication system of claim 4, wherein: The end surface of the insertion block (22) away from the second arc surface (222) is sealed and pressed by a sealing ring (2111) with the side wall of the insertion slot (210).

6. The CNC machine tool lubrication system of claim 5, wherein: The end surface of the insertion block (22) away from the second arc surface (222) is provided with a threaded hole (223), the outer side wall of the main body (21) is provided with a countersunk hole matched with the threaded hole (223), a mounting bolt (2231) is inserted and arranged in the countersunk hole in a threaded connection mode, and the end of the mounting bolt (2231) is inserted into the threaded hole (223).

7. The CNC machine tool lubrication system of claim 6, wherein: ​ 8. The CNC machine tool lubrication system of claim 7, wherein: The countersunk holes are arranged on the outer periphery of the main flow channel (2211), and a connecting pipe (4) for injecting lubricating oil is sealingly inserted into the outer end of the main flow channel (2211).

9. The CNC machine tool lubrication system of claim 8, wherein: The connecting pipe (4) is L-shaped and opens upward.

10. The CNC machine tool lubrication system of claim 9, wherein: The compensation flow channel (2213) is located above the main flow channel (2211), and the compensation flow channel (2213) is in communication with the clamping groove (220) located above the main flow channel (2211). The inner flow channel (221) further comprises an inclined converging channel (2214), the bottom end of the converging channel (2214) is in communication with the lower part of the branch flow channel (2212), the top end of the converging channel (2214) is in communication with the main flow channel (2211), and the top end of the converging channel (2214) is located directly below the compensation flow channel (2213).

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