A spindle center air blowing structure

Abstract

The utility model discloses a main shaft center blow structure, including gas pipe joint and air chamber, air chamber is fixed in the fixed part's tail end of main shaft of numerical control machine tool, air chamber cover is established in the tail end's outside of the rotating part of main shaft, and the rotating part of main shaft is provided with axial through -hole, and the tail of axial through -hole is the gas inlet, and gas pipe joint is installed on the air chamber, and the gas outlet of gas pipe joint is opposite the gas inlet, and the gas inlet of gas pipe joint is communicated with external gas source. The utility model discloses main shaft center blow structure's simple and reliable structure, and the low assembly requirement is convenient, and the material cost is low. Compared with the cost of traditional rotary joint up to 1000~2000 yuan, the total cost of the utility model discloses main shaft center blow structure is only dozens of yuan, can reduce the cost greatly. In addition, the utility model discloses main shaft center blow structure has no bearing structure, can avoid the high temperature burning loss problem of rotary joint due to bearing lubricating grease air dry, ensures the processing operation of machine tool.

Description

Technical Field

[0001] This utility model belongs to the field of CNC machine tools, specifically relating to a spindle center air blowing structure. Background Technology

[0002] Currently, the spindle air intake structure of CNC machine tools typically employs a rotary joint mounted at the tail end of the rotating part of the spindle. The rotary joint connects to an external air source via a pipe connector, enabling the spindle's center air blowing function. Existing rotary joints mainly consist of a spindle and a housing, connected by precision bearings. The housing is fixed to the fixed part of the spindle. During operation, the housing remains stationary, while the spindle rotates with the rotating part of the spindle, reaching a maximum speed of 1500 rpm. Existing rotary joints are expensive. Depending on their function, existing rotary joints are mainly divided into two types: the first type is for center water outlet and short-term center air blowing, priced at approximately 1000 yuan; the second type is for long-term center air blowing (waterless), with a more complex structure and a price almost doubled to around 2000 yuan. Furthermore, during prolonged spindle air blowing and high-speed operation, the bearing grease inside the rotary joint easily dries out, leading to abnormally high temperatures and even burnt-out of the rotary joint, thus affecting the machine tool's processing efficiency and reliability. Utility Model Content

[0003] The technical problem this invention aims to solve is to provide a spindle center air-blowing structure that is simple and reliable in structure, has low assembly requirements, is easy to install, and has low material costs, addressing the shortcomings of existing technologies. Furthermore, this spindle center air-blowing structure has no bearings, avoiding the problem of high-temperature burn-out of the rotary joint caused by the drying of bearing grease, thus ensuring the smooth operation of the machine tool.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a spindle center air blowing structure, including an air pipe connector and an air chamber. The air chamber is fixed to the tail end of the fixed part of the spindle of a CNC machine tool. The air chamber covers the outside of the tail end of the rotating part of the spindle. The rotating part of the spindle has an axial through hole. The tail end of the axial through hole is an air inlet. The air pipe connector is installed on the air chamber. The air outlet end of the air pipe connector faces the air inlet. The air inlet end of the air pipe connector is connected to an external air source.

[0005] This invention relates to a spindle center-blowing structure that utilizes an air chamber to form a relatively sealed cavity at the spindle tail end. High-speed, high-pressure gas is introduced into the axial through-hole of the rotating part of the spindle through an air pipe connector. Based on fluid mechanics principles, when the high-speed, high-pressure gas enters the spindle tail end through the air inlet, a negative pressure is formed around the air inlet. Since the air chamber is a relatively sealed cavity, the pressure loss during gas delivery to the axial through-hole is negligible, thus ensuring the effective center-blowing of the spindle.

[0006] This utility model's spindle center air-blowing structure replaces the expensive traditional rotary joint with a common air pipe connector, and, in conjunction with a relatively sealed air chamber, achieves the spindle's center air-blowing function. This spindle center air-blowing structure is simple and reliable, with low assembly requirements, convenient installation, and low material costs. Compared to the cost of 1000-2000 yuan for a traditional rotary joint, the total cost of this spindle center air-blowing structure is only tens of yuan, significantly reducing costs. Furthermore, this spindle center air-blowing structure has no bearing structure, avoiding the problem of high-temperature burnout of the rotary joint caused by the drying of bearing grease, ensuring the smooth operation of the machine tool.

[0007] Preferably, the air chamber is made of sheet metal and includes an integrally formed cover plate, side plate, and bottom plate. The bottom plate is fixed to the tail end of the fixed part of the main shaft by screws, and the air pipe connector is installed in the middle of the cover plate. Using sheet metal for the air chamber results in a simple structure, ease of manufacturing, and further cost reduction.

[0008] Preferably, a connecting pipe is welded to the middle of the cover plate. The head of the connecting pipe extends into the air inlet, and there is a gap between the outer surface of the head of the connecting pipe and the inner surface of the tail end of the rotating part of the spindle. The tail end of the connecting pipe is located behind the air chamber, and the tail end of the connecting pipe is detachably and sealingly connected to the air outlet end of the air pipe connector. This design of the connecting pipe facilitates the installation and replacement of the air pipe connector and further improves the reliability of the spindle's center air blowing.

[0009] Preferably, the tail end of the connecting pipe is connected to the air outlet end of the air pipe connector with a tapered thread, which provides a better sealing effect.

[0010] Compared with existing technologies, this invention has the following advantages: The spindle center air-blowing structure of this invention replaces the expensive traditional rotary joint with a common air pipe connector, and, in conjunction with a relatively sealed air chamber, achieves the spindle center air-blowing function. The spindle center air-blowing structure of this invention is simple and reliable, has low assembly requirements, is easy to install, and has low material costs. Compared to the cost of 1000-2000 yuan for a traditional rotary joint, the total cost of the spindle center air-blowing structure of this invention is only tens of yuan, significantly reducing costs. Furthermore, the spindle center air-blowing structure of this invention has no bearing structure, avoiding the problem of high-temperature burnout of the rotary joint caused by the drying of bearing grease, ensuring the machining operation of the machine tool. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the effect of the central air blowing structure of the spindle after it is installed at the tail end of the CNC machine tool spindle in the embodiment.

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 1 and Figure 2 The specific reference numerals in the attached figures are as follows:

[0014] 1-Air pipe connector, 11-Air outlet, 12-Air inlet, 2-Air chamber, 21-Cover plate, 22-Side plate, 23-Base plate, 24-Screw, 25-Connecting pipe, 26-Gap, 31-Fixed part of spindle, 32-Rotating part of spindle, 33-Axial through hole, 34-Air inlet. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] The spindle center blowing structure of the embodiment, such as Figure 1 and Figure 2 As shown, the machine tool includes an air pipe connector 1 and an air chamber 2. The air chamber 2 is fixed to the tail end of the fixed part 31 of the spindle of the CNC machine tool. The air chamber 2 covers the outside of the tail end of the rotating part 32 of the spindle. The rotating part 32 of the spindle has an axial through hole 33. The tail end of the axial through hole 33 is an air inlet 34. The air pipe connector 1 is installed on the air chamber 2. The air outlet 11 of the air pipe connector 1 is directly opposite the air inlet 34. The air inlet 12 of the air pipe connector 1 is connected to an external air source (not shown in the figure).

[0017] In this embodiment, the air pipe connector 1 is a commercially available quick-connect connector; the air chamber 2 is a self-made product, which is made of sheet metal and includes a cover plate 21, a side plate 22 and a bottom plate 23 that are integrated together. The bottom plate 23 is fixed to the tail end of the fixed part 31 of the main shaft by screws 24. The air pipe connector 1 is installed in the middle of the cover plate 21. Specifically, a connecting pipe 25 is welded to the middle of the cover plate 21. The head of the connecting pipe 25 extends into the air inlet 34. There is a gap 26 between the outer surface of the head of the connecting pipe 25 and the inner surface of the tail end of the rotating part 32 of the main shaft. The tail end of the connecting pipe 25 is located on the rear side of the air chamber 2. The tail end of the connecting pipe 25 is connected to the air outlet 11 of the air pipe connector 1 by a tapered thread.

[0018] After the aforementioned spindle center air blowing structure is installed, the air chamber 2 remains stationary while the rotating part 32 of the spindle rotates. During the spindle center air blowing process, high-speed, high-pressure gas enters the connecting pipe 25 from the air pipe connector 1 and then enters the air inlet 34 via the connecting pipe 25. Because there is a gap 26 between the outer surface of the head of the connecting pipe 25 and the inner surface of the tail end of the rotating part 32 of the spindle, the connecting pipe 25 and the rotating part 32 of the spindle do not contact each other, thus the connecting pipe 25 and the rotating part 32 of the spindle do not affect each other. Based on fluid mechanics principles, when the high-speed, high-pressure gas enters the tail end of the spindle through the air inlet 34, a negative pressure is formed around the air inlet 34 (i.e., around the gap 26). Since the air chamber 2 is a relatively sealed cavity structure, the pressure loss during the gas delivery to the axial through hole 33 is negligible, thereby ensuring the effective center air blowing of the spindle.

[0019] The aforementioned spindle center air-blowing structure is simple and reliable, with low assembly requirements, convenient installation, and low material costs. Compared to the cost of traditional rotary joints, which can reach 1000-2000 yuan, the total cost of the aforementioned spindle center air-blowing structure is only tens of yuan, significantly reducing costs. Furthermore, the aforementioned spindle center air-blowing structure has no bearings, avoiding the problem of high-temperature burnout of the rotary joint caused by the drying of bearing grease, thus ensuring the smooth operation of the machine tool.

Claims

1. A spindle center blowoff structure characterized by comprising: The device includes an air pipe connector and an air chamber. The air chamber is fixed to the tail end of the fixed part of the spindle of the CNC machine tool. The air chamber covers the outside of the tail end of the rotating part of the spindle. The rotating part of the spindle has an axial through hole, and the tail end of the axial through hole is an air inlet. The air pipe connector is installed on the air chamber, and the air outlet of the air pipe connector is directly opposite the air inlet. The air inlet of the air pipe connector is connected to an external air source.

2. The spindle center air blowing structure according to claim 1, wherein The air chamber is made of sheet metal and includes a cover plate, a side plate and a bottom plate that are integrated together. The bottom plate is fixed to the tail end of the fixed part of the main shaft by screws, and the air pipe connector is installed in the middle of the cover plate.

3. The spindle center air blowing structure according to claim 2, wherein A connecting pipe is welded to the middle of the cover plate. The head of the connecting pipe extends into the air inlet. There is a gap between the outer surface of the head of the connecting pipe and the inner surface of the tail end of the rotating part of the main shaft. The tail end of the connecting pipe is located on the rear side of the air chamber. The tail end of the connecting pipe is detachably and sealed to the air outlet end of the air pipe connector.

4. The spindle center air blowing structure according to claim 3, wherein The tail end of the connecting pipe is connected to the outlet end of the air pipe connector via a tapered thread.

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