Boring shaft feeding device of numerical control floor type boring and milling machine

Abstract

A numerical control floor type boring and milling machine boring shaft feeding device, comprising a boring shaft and a milling shaft, the boring shaft is movably arranged in the milling shaft and can extend out of the end of the milling shaft, further comprising a boring shaft protection mechanism detachably mounted on the end of the milling shaft, the boring shaft protection mechanism comprises a sleeve and a gas protection device arranged on the sleeve, the gas protection device is used for conveying compressed air to the gap between the sleeve and the boring shaft, and the blowing direction of the compressed air is towards the outside of the milling shaft. The numerical control floor type boring and milling machine boring shaft feeding device improves the service life by blowing the compressed air outward; the protection mechanism adopts a detachable design, improving the maintainability; through the design of the inner sleeve, the annular air vent and the plurality of evenly distributed inner air holes, the protection effect is improved; the maintainability is improved through the setting of the conical ring.

Description

Technical Field

[0001] This utility model relates to the field of processing equipment technology, specifically to a boring spindle feed device for a CNC floor-type boring and milling machine. Background Technology

[0002] As a large-scale, high-precision key equipment, the CNC floor-type boring and milling machine is widely used in the processing of major and complex parts in the fields of energy, heavy machinery, and aerospace. The performance of its boring spindle feed device directly determines the service life and reliability of the machine tool.

[0003] In existing technologies, when the boring spindle of a CNC floor-type boring and milling machine extends out of the milling spindle for machining, there is an annular gap between the boring spindle and the end of the milling spindle. Metal chips, dust, and a large amount of coolant generated during machining can easily enter the interior of the milling spindle through this gap. These contaminants can cause wear and damage to critical components. Existing technologies attempt to use compressed air to form an air curtain for sealing, but these solutions often blow the gas inward or radially towards the inside of the milling spindle. Their purpose is mostly positive pressure dust prevention, rather than specifically for working conditions with a large amount of chips and coolant. This blowing method sometimes blows some contaminants into the sealed interior, which is not ideal. Moreover, the structure is usually integrated with the end of the spindle, making it inconvenient for maintenance and replacement.

[0004] Therefore, researching new feed devices for the boring spindle of CNC floor-type boring and milling machines and solving the above problems is of great significance for improving the service life and maintainability of CNC floor-type boring and milling machines. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a boring spindle feed device for a CNC floor-type boring and milling machine. This device uses compressed air blown outwards to form a uniform and stable "air curtain" between the boring spindle and the outer sleeve, effectively preventing external chips, dust, and coolant from reversibly intruding into the milling spindle, thus improving the service life of the CNC floor-type boring and milling machine. The protective mechanism features a detachable design, allowing for easy replacement even after prolonged use, if a small amount of contaminants accumulates internally or parts need to be replaced. The entire machine tool can be disassembled for cleaning or repair without extensive disassembly of the main body, greatly saving maintenance time and labor costs and improving the maintainability of the CNC floor-type boring and milling machine. The design of the inner sleeve, annular vent groove and multiple evenly distributed internal air holes ensures that compressed air can be blown out evenly and in a ring shape, forming a complete air curtain without dead angles, thus improving the protection effect. The conical ring can scrape off the attached iron filings and sludge when the boring spindle retracts and guide the coolant to the bottom to flow out, improving maintainability.

[0006] The technical solution of this utility model is as follows: A boring spindle feed device for a CNC floor-type boring and milling machine includes a boring spindle and a milling spindle. The boring spindle is axially movable within the milling spindle and can extend beyond its end. It also includes a boring spindle protection mechanism detachably mounted on the end of the milling spindle. The boring spindle protection mechanism includes an outer sleeve and a gas protection device mounted on the outer sleeve. The gas protection device includes a compressed air connector and an inner sleeve fixed within the outer sleeve. The inner wall of the inner sleeve has a clearance fit with the boring spindle. An annular vent groove is formed on the side wall of the inner sleeve. Multiple internal air holes extending to the inner wall of the inner sleeve are formed circumferentially at the bottom of the vent groove. One end of the compressed air connector is connected to a compressed air source, and the other end is connected to the vent groove. The gas protection device is used to deliver compressed air into the gap between the outer sleeve and the boring spindle, and the compressed air is blown outwards towards the outside of the milling spindle.

[0007] The outer sleeve has a first hole, a second hole, and a third hole with gradually decreasing diameters arranged in sequence along the direction away from the milling shaft. The first hole is clearance-fitted with the boring shaft, and the inner sleeve is fixed in the second hole. The external air hole on the side wall of the outer sleeve is connected to the ventilation groove, and the other end of the compressed air connector is connected to the external air hole.

[0008] There are 20 internal air vents.

[0009] The internal air vents are evenly distributed along the circumference.

[0010] The inner sleeve is made of tin bronze.

[0011] The gas protection device also includes a conical ring, which is detachably mounted on the third hole, which includes a conical opening with the conical end facing outwards from the milling shaft.

[0012] The conical ring is made of PEEK plastic.

[0013] A seal is provided between the boring bar and the outer sleeve.

[0014] The seal is a labyrinth seal.

[0015] The pressure of the compressed air is 0.1 to 0.3 MPa.

[0016] The beneficial effects of this utility model are as follows: This utility model discloses a boring spindle feed device for a CNC floor-type boring and milling machine. By blowing compressed air outward, a uniform and stable "air curtain" is formed between the boring spindle and the outer sleeve, which can effectively prevent external chips, dust and coolant from reversibly invading into the milling spindle, thereby improving the service life of the CNC floor-type boring and milling machine.

[0017] 2. The present invention discloses a boring spindle feed device for a CNC floor-type boring and milling machine. The protective mechanism adopts a detachable design. After long-term use, even if a small amount of contaminants accumulate inside or parts need to be replaced, it can be easily disassembled for cleaning or maintenance without extensive disassembly of the machine tool body. This greatly saves maintenance time and labor costs and improves the maintainability of the CNC floor-type boring and milling machine.

[0018] 3. The present invention discloses a CNC floor-type boring and milling machine boring spindle feed device, which, through the design of inner sleeve, annular ventilation groove and multiple evenly distributed internal air holes, ensures that compressed air can be blown out evenly and in an annular shape, forming a complete air curtain without dead angles, thereby improving the protection effect.

[0019] 4. The present invention discloses a boring spindle feed device for a CNC floor-type boring and milling machine. Through the setting of a conical ring, the attached iron filings and sludge can be scraped off when the boring spindle retracts and the coolant can be guided to the bottom to flow out, thereby improving maintainability. Attached Figure Description

[0020] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0021] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a boring spindle feed device for a CNC floor-type boring and milling machine according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of point I in the diagram; Figure 3 for Figure 2 Sectional view of AA; Figure 4 This is a schematic diagram of the outer sleeve structure of a boring spindle feed device for a CNC floor-type boring and milling machine according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the conical ring structure of a boring spindle feed device for a CNC floor-type boring and milling machine according to an embodiment of the present invention.

[0022] The components represented by the various reference numerals in the diagram are: This utility model includes: 1. Boring shaft, 2. Milling shaft, 3. Seal, 4. Compressed air connector, 5. Outer sleeve, 5a. External air hole, 5b. Sealing groove, 5c. First hole, 5d. Second hole, 5e. Third hole, 6. Inner sleeve, 6a. Vent groove, 6b. Internal air hole, 7. Conical ring, 7a. Conical opening, 8. Guide rail, 9. Base, 10. Column, 11. Spindle box, 12. Slide block. Detailed Implementation

[0023] like Figure 1 and Figure 2 As shown, in the prior art, a CNC floor-type boring and milling machine includes a guide rail 8, a base 9, a column 10, a spindle box 11, and a ram 12. The guide rail 8 is fixedly installed on the ground. The base 9 is horizontally movable on the guide rail 8. The column 10 is fixedly installed on the base 9. The spindle box 11 is vertically movable on the column 10. The ram 12 is installed inside the spindle box 11 and can move horizontally back and forth. The boring spindle feed device of the CNC floor-type boring and milling machine is installed in the ram 12 and includes a boring spindle 1 and a milling spindle 2. The milling spindle 2 is rotatably installed in the ram 12. The boring spindle 1 is axially movable in the milling spindle 2 and can extend out of the end of the milling spindle 2.

[0024] Based on the aforementioned existing technology, this utility model improves the boring spindle feed device (specifically, the protection at the end of the milling spindle 2) of a CNC floor-type boring and milling machine. The boring spindle feed device of the CNC floor-type boring and milling machine includes a boring spindle protection mechanism detachably installed at the end of the milling spindle 2. The boring spindle protection mechanism includes an outer sleeve 5 and a gas protection device disposed on the outer sleeve 5. The outer sleeve 5 is detachably attached to the end face of the milling spindle 2 by means of bolts or other methods. The gas protection device is used to supply compressed air to the gap between the outer sleeve 5 and the boring shaft 1, and the compressed air is blown in the direction of the outer side of the milling shaft 2. Preferably, the pressure of the compressed air is 0.1 to 0.3 MPa.

[0025] like Figures 1 to 5 As shown, the gas protection device includes a compressed air connector 4, an external vent 5a on the side wall of the outer sleeve 5, and an inner sleeve 6. The center of the outer sleeve 5, along the direction away from the milling shaft 2, has a first hole 5c, a second hole 5d, and a third hole 5e with gradually decreasing diameters. The first hole 5c is clearance-fitted with the boring shaft 1. The inner sleeve 6 is fixed in the second hole 5d by an interference fit or other means. The inner wall of the inner sleeve 6 is clearance-fitted with the boring shaft 1. An annular vent groove 6a is provided on the side wall of the inner sleeve 6. Preferably, the material of the inner sleeve 6 is tin bronze. The vent groove 6a communicates with the external vent 5a, and the bottom of the vent groove 6a has multiple openings along the circumferential direction. An inner air hole 6b extends through the inner wall of the inner sleeve 6. Preferably, there are 20 inner air holes 6b. Preferably, the inner air holes 6b are evenly distributed circumferentially. One end of the compressed air connector 4 is used to connect to a compressed air source, and the other end is connected to an outer air hole 5a. The compressed air connector 4 is screwed into or welded to the outer air hole 5a, and its other end is connected to an external compressed air source with a pressure of 0.3MPa through an air pipe. The compressed air enters the annular ventilation groove 6a through the connector 4 and the outer air hole 5a, and finally passes through the 20 evenly distributed inner air holes 6b to form a uniform and stable air curtain, which is blown onto the surface of the boring shaft 1.

[0026] like Figure 1 , Figure 2 and Figure 5As shown, the gas protection device also includes a conical ring 7, which is detachably installed in the third hole 5e by means of bolt connection or other means. The conical ring 7 includes a conical opening 7a, the conical end of which faces outward of the milling shaft 2. Preferably, the material of the conical ring 7 is PEEK plastic. In the third hole 5e section at the front end of the outer sleeve 5, a conical ring 7 made of PEEK plastic is installed by bolts. The inner hole of the conical ring 7 is a conical opening 7a, the conical opening end of which faces forward away from the milling shaft 2. This conical opening 7a forms a non-contact narrow airflow channel with the surface of the boring shaft 1.

[0027] like Figure 1 and Figure 2 As shown, a seal 3 is provided between the boring bar 1 and the outer sleeve 5. The sealing groove 5b is provided in the first hole 5c of the outer sleeve 5. Preferably, the seal 3 is a labyrinth seal to prevent contaminants from entering from the rear.

[0028] The working process of the boring spindle feed device of a CNC floor-type boring and milling machine is as follows: When the boring bar 1 extends from the milling bar 2 for machining, compressed air is continuously supplied. The compressed air enters the outer air hole 5a through the compressed air connector 4, then enters the ventilation groove 6a, and finally is ejected from the inner air hole 6b. After being blown onto the surface of the boring bar 1, it mainly flows in two directions: 1. The majority of the compressed air flow carries energy and is ejected forward (towards the machining area) along the surface of the boring bar 1. This continuously forward positive pressure airflow forms an effective "air curtain barrier" that can powerfully disperse chips and coolant droplets that attempt to approach, and prevent dust from entering.

[0029] 2. A very small portion of the compressed air flow will flow backward, but due to the obstruction of the labyrinth seal 3 at the rear and the fact that the airflow pressure is mainly forward, it can effectively prevent pollutants from penetrating backward.

[0030] The tapered opening 7a of the tapered ring 7 can scrape off the attached iron filings and sludge when the boring bar retracts and guide the coolant to the bottom to flow out, improving maintainability; at the same time, the PEEK material is soft and wear-resistant, so even if it is slightly rubbed against the boring bar 1 which moves or rotates at high speed, it will not damage the valuable boring bar.

[0031] The boring spindle feed device of this CNC floor-type boring and milling machine uses compressed air blown outwards to form a uniform and stable "air curtain" between the boring spindle and the outer sleeve. This effectively prevents external chips, dust, and coolant from reversibly invading the milling spindle, thus extending the service life of the CNC floor-type boring and milling machine. The protective mechanism adopts a detachable design. Even after long-term use, if a small amount of contaminants accumulates inside or parts need to be replaced, it can be easily disassembled for cleaning or maintenance without extensive disassembly of the machine body. This greatly saves maintenance time and labor costs, improving the maintainability of the CNC floor-type boring and milling machine. The design of the inner sleeve, annular vent groove, and multiple evenly distributed internal air holes ensures that compressed air can be blown out evenly and in a ring shape, forming a complete air curtain without dead angles, thus improving the protective effect. The conical ring can scrape off the attached iron filings and sludge when the boring spindle retracts and guide the coolant to the bottom to flow out, improving maintainability.

Claims

1. A boring spindle feed device for a CNC floor-type boring and milling machine, comprising a boring spindle (1) and a milling spindle (2), wherein the boring spindle (1) is axially movable within the milling spindle (2) and can extend beyond the end of the milling spindle (2), characterized in that, It also includes a boring bar protection mechanism that is detachably installed at the end of the milling spindle (2). The boring bar protection mechanism includes an outer sleeve (5) and a gas protection device installed on the outer sleeve (5). The gas protection device includes a compressed air connector (4) and an inner sleeve (6) fixed inside the outer sleeve (5). The inner wall of the inner sleeve (6) is clearance-fitted with the boring bar (1). An annular ventilation groove (6a) is provided on the side wall of the inner sleeve (6). The bottom of the ventilation groove (6a) has multiple internal air holes (6b) that penetrate to the inner wall of the inner sleeve (6) along the circumferential direction. One end of the compressed air connector (4) is connected to a compressed air source, and the other end is connected to the ventilation groove (6a). The gas protection device is used to deliver compressed air to the gap between the outer sleeve (5) and the boring bar (1), and the direction of the compressed air blowing is towards the outside of the milling spindle (2).

2. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 1, characterized in that, The outer sleeve (5) has a first hole (5c), a second hole (5d) and a third hole (5e) with gradually decreasing diameters arranged in sequence along the direction away from the milling shaft (2). The first hole (5c) is clearance-fitted with the boring shaft (1), the inner sleeve (6) is fixed in the second hole (5d), the external air hole (5a) opened on the side wall of the outer sleeve (5) is connected to the ventilation groove (6a), and the other end of the compressed air connector (4) is connected to the external air hole (5a).

3. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 2, characterized in that, The internal air vents (6b) are provided with 20.

4. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 3, characterized in that, The internal vents (6b) are evenly distributed circumferentially.

5. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 2, characterized in that, The inner sleeve (6) is made of tin bronze.

6. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 2, characterized in that, The gas protection device also includes a conical ring (7), which is detachably installed in the third hole (5e). The conical ring (7) includes a conical opening (7a), the conical end of which is located on the outside of the milling shaft (2).

7. A boring spindle feed device for a CNC floor-type boring and milling machine according to claim 6, characterized in that, The conical ring (7) is made of PEEK plastic.

8. The boring spindle feed device for a CNC floor-type boring and milling machine according to claim 1, characterized in that, A seal (3) is provided between the boring bar (1) and the outer sleeve (5).

9. A boring spindle feed device for a CNC floor-type boring and milling machine according to claim 8, characterized in that, The sealing element (3) is a labyrinth seal.

10. A boring spindle feed device for a CNC floor-type boring and milling machine according to claim 1, characterized in that, The pressure of the compressed air is 0.1 to 0.3 MPa.

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