Oil injection lubricating device for front end of telescopic main shaft of numerical control boring machine

Abstract

The utility model provides a numerical control boring machine telescopic main shaft front end oil injection lubricating device which comprises a transmission main shaft and a hollow milling shaft arranged outside the transmission main shaft in a sleeved mode, the hollow milling shaft is sleeved with a main shaft outer sleeve in a rotating mode, and the front end of the main shaft outer sleeve is fixedly connected with a front gland arranged outside the hollow milling shaft in a sealed and sleeved mode. A U-shaped oil channel is formed in the hollow milling shaft, and the length direction of the U-shaped oil channel is distributed in the radial direction of the hollow milling shaft. According to the utility model, the U-shaped oil channel is arranged in the hollow milling shaft, the two ends of the U-shaped oil channel face the transmission main shaft, one straight channel on the U-shaped oil channel is communicated with the gap between the hollow milling shaft and the transmission main shaft, and the piston disc and the supporting spring are arranged in the other straight channel on the U-shaped oil channel; the piston disc can push part of lubricating oil in the U-shaped oil channel to enter the outer surface of the transmission main shaft due to the centrifugal effect, and the advantage of reliable centrifugal lubrication is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lubrication of numerically controlled boring machines, in particular to an oil injection lubrication device for the front end of a telescopic main shaft of a numerically controlled boring machine. Background Art

[0002] Horizontal CNC boring machine is a kind of high-precision, high-speed and high-value equipment. Horizontal CNC boring machine is usually equipped with a telescopic spindle, which not only rotates but also telescopes back and forth. If there is no lubricating grease during the telescopic movement, the telescopic spindle will be worn, stretched and rusted.

[0003] The current lubrication method is to have an oil injection device behind the spindle to supply oil, but the telescopic spindle is mostly working when only a small section in front of the spindle moves back and forth, so the lubricating oil behind cannot be brought to the front of the spindle, so the front part of the spindle needs to be lubricated. However, the telescopic spindle and the hollow milling spindle always rotate together, and because there is a gap between the spindle and the hollow spindle, it is difficult to inject lubricating oil into the telescopic spindle due to centrifugal force, making it difficult to lubricate the front end of the outer peripheral wall of the telescopic spindle.

[0004] To this end, the utility model provides an oil injection and lubrication device for the front end of a telescopic main shaft of a numerically controlled boring machine. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide an oil injection lubrication device for the front end of the telescopic spindle of a CNC boring machine to solve the problems raised in the above-mentioned background technology. The utility model has the advantage of reliable centrifugal lubrication of the outer peripheral wall of the transmission spindle close to the front end.

[0006] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: an oil injection lubrication device at the front end of the telescopic spindle of a CNC boring machine comprises a transmission spindle and a hollow milling shaft sleeved on the outside of the transmission spindle, the outer rotating sleeve of the hollow milling shaft is provided with a spindle outer sleeve, the front end of the spindle outer sleeve is fixedly connected with a sealing sleeve and a front pressure cover arranged on the outside of the hollow milling shaft, a U-shaped oil channel is opened in the hollow milling shaft, the length direction of the U-shaped oil channel is distributed along the radial direction of the hollow milling shaft, one end of a straight channel on the U-shaped oil channel extends to the joint surface of the transmission spindle and the hollow milling shaft, a piston disc and a support spring are arranged in the other straight channel on the U-shaped oil channel, and under the action of the support spring, the piston disc and the blind end of the other straight channel on the U-shaped oil channel are abutted against each other.

[0007] Furthermore, the piston disc and the straight track are clearance-matched, and one side of the piston disc is fixedly connected with a positioning shaft sleeved in a support spring.

[0008] Furthermore, the number of the U-shaped oil passages is at least two and they are evenly distributed circumferentially relative to the hollow milling shaft.

[0009] Furthermore, an oil storage channel is opened inside the front pressure cover, an annular groove is opened on the outer peripheral wall of the hollow milling shaft, one end of the oil storage channel is connected with the annular groove, and a transmission channel connecting the annular groove and the straight channel inner cavity where the support spring is located is opened in the hollow milling shaft.

[0010] Furthermore, the number of the transmission channels is at least three and they are evenly distributed circumferentially relative to the hollow milling shaft.

[0011] Furthermore, an oil filling port 1 connected to the other end of the oil storage channel is formed on the outer peripheral wall of the front gland.

[0012] Furthermore, an oil delivery channel is provided in the main shaft outer casing, a connecting channel connecting the oil delivery channel and the oil storage channel is provided in the front pressure cover, and an oil injection thread connected to the oil delivery channel is provided on the outer peripheral wall of the main shaft outer casing.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. In the utility model, a U-shaped oil passage is arranged in the hollow milling shaft, both ends of the U-shaped oil passage are toward the transmission main shaft, and a straight passage on the U-shaped oil passage is connected with the gap between the hollow milling shaft and the transmission main shaft, and a piston disc and a support spring are arranged in the other straight passage on the U-shaped oil passage. When the transmission main shaft rotates, the piston disc will push part of the lubricating oil in the U-shaped oil passage into the outer surface of the transmission main shaft due to the centrifugal effect, which has the advantage of centrifugal lubrication.

[0015] 2. In the present invention, by setting the piston disc and the straight track accommodating the piston disc into a clearance fit structure, lubricating oil will pass through the outer peripheral wall of the piston disc when subjected to centrifugal force, so that the piston disc can move reliably and the centrifugal lubrication is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional view of the oil injection and lubrication device at the front end of the telescopic spindle of the CNC boring machine of the utility model;

[0017] Figure 2 for Figure 1 A partial view of the coordination of the middle U-shaped oil passage, piston disc, support spring, oil storage passage and oil delivery passage;

[0018] Figure 3 The utility model is a schematic structural diagram of a cross-section of a hollow milling shaft of an oil injection lubrication device at the front end of a telescopic spindle of a CNC boring machine.

[0019] In the figure: 1. Transmission spindle; 2. Hollow milling shaft; 22. Annular groove; 23. Transmission channel; 3. Spindle outer sleeve; 31. Oil delivery channel; 33. Oil filling thread; 4. Front pressure cover; 41. Oil storage channel; 42. Oil filling port 1; 43. Connecting channel; 5. U-shaped oil channel; 51. Straight channel; 6. Piston disc; 61. Positioning shaft; 7. Support spring. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] See also Figures 1 to 3 The utility model provides a technical solution: an oil injection and lubrication device at the front end of a telescopic spindle of a CNC boring machine, comprising a transmission spindle 1 and a hollow milling shaft 2 sleeved on the outside of the transmission spindle 1, the transmission spindle 1 being a telescopic spindle, the outer rotating sleeve of the hollow milling shaft 2 being provided with a spindle outer sleeve 3, the front end of the spindle outer sleeve 3 being fixedly connected with a sealing sleeve and a front pressure cover 4 being provided on the outside of the hollow milling shaft 2, that is to say, a sealing assembly is provided between the front pressure cover 4 and the hollow milling shaft 2, the sealing assembly being a sheep felt pressure ring located on the outside and a sheep felt retaining ring located on the inside, and when the hollow milling shaft 2 rotates relative to the front pressure cover 4, the sealing assembly can prevent the cutting fluid from entering.

[0022] In the present technical solution, a U-shaped oil passage 5 is provided in the hollow milling shaft 2, and the length direction of the U-shaped oil passage 5 is distributed along the radial direction of the hollow milling shaft 2. One end of a straight passage 51 on the U-shaped oil passage 5 extends to the joint surface of the transmission main shaft 1 and the hollow milling shaft 2. In specific implementation, an annular circulating oil groove can be provided at the joint of the transmission main shaft 1 and the hollow milling shaft 2. A piston disc 6 and a support spring 7 are provided in another straight passage 51 on the U-shaped oil passage 5. Under the action of the support spring 7, the piston disc 6 and the blind end of another straight passage 51 on the U-shaped oil passage 5 are abutted against each other. That is to say, the piston disc 6 is arranged close to the transmission main shaft 1. When in use, lubricating oil is injected into the U-shaped oil passage 5. When the transmission main shaft 1 rotates, the lubricating oil in the U-shaped oil passage 5 will flow in the direction away from the transmission main shaft 1 under the action of centrifugal force. Since the piston disc 6 will also move in the direction away from the transmission main shaft 1 under the action of centrifugal force, the centrifugal force of the piston disc 6 is greater than the centrifugal force of the lubricating oil at this time, and then the lubricating oil in the U-shaped oil passage 5 can be pushed into the outer peripheral wall of the transmission main shaft 1, thereby realizing lubrication of the outer peripheral wall of the transmission main shaft 1 near the front end.

[0023] In this embodiment, the piston disc 6 and the straight track 51 are clearance-matched, and one side of the piston disc 6 is fixedly connected to a positioning shaft 61 sleeved in the support spring 7, that is, the piston disc 6 and the straight track 51 are in a non-sealed contact state. The purpose of this arrangement is to prevent the piston disc 6 and the straight track 51 from forming a closed space at the blind end, thereby allowing the piston disc 6 to move reliably when subjected to centrifugal force.

[0024] In this embodiment, the number of U-shaped oil passages 5 is at least two and they are evenly distributed circumferentially relative to the hollow milling shaft 2. The function of this arrangement is to improve the rotation stability of the transmission spindle 1 and eliminate unbalanced rotational inertia.

[0025] Furthermore, an oil storage channel 41 is provided inside the front gland 4, an annular groove 22 is provided on the outer peripheral wall of the hollow milling shaft 2, one end of the oil storage channel 41 is connected to the annular groove 22, and a transmission channel 23 is provided inside the hollow milling shaft 2 to connect the annular groove 22 and the inner cavity of the straight track 51 where the support spring 7 is located. At this time, when the hollow milling shaft 2 rotates, an oil scraping action will be generated, and the lubricating oil in the oil storage channel 41 can be introduced into the straight track 51 where the support spring 7 is located through the transmission channel 23, which has the function of replenishing the lubricating oil. The number of the transmission channels 23 is at least three and they are evenly distributed circumferentially relative to the hollow milling shaft 2.

[0026] In this embodiment, the outer peripheral wall of the front gland 4 is provided with an oil filling port 42 connected to the other end of the oil storage channel 41. The oil filling port 42 is a fine-pitch cone thread structure and is a filling port for lubricating oil.

[0027] In this embodiment, an oil delivery channel 31 is provided in the main shaft outer casing 3, a connecting channel 43 connecting the oil delivery channel 31 and the oil storage channel 41 is provided in the front pressure cover 4, and an oil filling thread 33 connected to the oil delivery channel 31 is provided on the outer peripheral wall of the main shaft outer casing 3. The purpose of this arrangement is to increase the oil filling position, improve the convenience of lubricating grease filling, and at the same time increase the oil storage space.

[0028] Working principle: When the transmission spindle 1 and the hollow milling shaft 2 rotate synchronously, an oil scraping action will occur, and the lubricating oil in the oil storage channel 41 can be introduced into the straight channel 51 where the support spring 7 is located through the transmission channel 23. At the same time, the piston disc 6 will move away from the transmission spindle 1 under the action of centrifugal force, the support spring 7 is compressed, and part of the lubricating oil in the U-shaped oil channel 5 will be squeezed into the outer peripheral wall of the transmission spindle 1, thereby improving the wear and rust resistance of the outer peripheral wall of the transmission spindle 1.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An oil injection lubrication device for the front end of a telescopic spindle of a CNC boring machine comprises a transmission spindle (1) and a hollow milling spindle (2) sleeved on the outside of the transmission spindle (1), the outer rotating sleeve of the hollow milling spindle (2) is provided with a spindle outer sleeve (3), the front end of the spindle outer sleeve (3) is fixedly connected with a front gland (4) having a sealing sleeve arranged on the outside of the hollow milling spindle (2), and is characterized in that: A U-shaped oil passage (5) is provided in the hollow milling shaft (2), the length direction of the U-shaped oil passage (5) being distributed along the radial direction of the hollow milling shaft (2), one end of a straight passage (51) on the U-shaped oil passage (5) extending to the joint surface between the transmission main shaft (1) and the hollow milling shaft (2), a piston disc (6) and a support spring (7) are provided in another straight passage (51) on the U-shaped oil passage (5), and under the action of the support spring (7), the piston disc (6) and the blind end of another straight passage (51) on the U-shaped oil passage (5) abut against each other.

2. The oil injection lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 1 is characterized in that: The piston disc (6) and the straight track (51) are clearance-matched, and a positioning shaft (61) sleeved in a support spring (7) is fixedly connected to one side of the piston disc (6).

3. The oil injection and lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 1 is characterized in that: The number of the U-shaped oil passages (5) is at least two and they are evenly distributed in the circumferential direction relative to the hollow milling shaft (2).

4. The oil injection and lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 3 is characterized in that: An oil storage channel (41) is provided inside the front pressure cover (4), an annular groove (22) is provided on the outer peripheral wall of the hollow milling shaft (2), one end of the oil storage channel (41) is connected to the annular groove (22), and a transmission channel (23) is provided inside the hollow milling shaft (2) to connect the annular groove (22) and the inner cavity of the straight channel (51) where the support spring (7) is located.

5. The oil injection and lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 4 is characterized in that: The number of the transmission channels (23) is at least three and they are evenly distributed in the circumferential direction relative to the hollow milling shaft (2).

6. The oil injection and lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 4 is characterized in that: The outer peripheral wall of the front gland (4) is provided with an oil filling port (42) which is connected to the other end of the oil storage channel (41).

7. The oil injection and lubrication device for the front end of the telescopic spindle of a CNC boring machine according to claim 6 is characterized in that: An oil delivery channel (31) is provided in the main shaft outer sleeve (3), a connecting channel (43) connecting the oil delivery channel (31) and the oil storage channel (41) is provided in the front pressure cover (4), and an oil injection thread (33) connected to the oil delivery channel (31) is provided on the outer peripheral wall of the main shaft outer sleeve (3).

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