Boring equipment and boring process for fan main shaft

Abstract

The invention relates to the technical field of deep hole machining, in particular to boring equipment and technology for a fan spindle, the boring equipment for the fan spindle comprises an outer pipe, an inner pipe and a center rod, a fixing seat is arranged at the rear end of the outer pipe, an oil inlet and an oil outlet are formed in the fixing seat, and an annular flow channel is formed between the outer pipe and the inner pipe; a chip removal channel is formed between the inner pipe and the center rod, the oil inlet is communicated with the annular runner, and the oil outlet is communicated with the chip removal channel; the outer pipe is further provided with a liquid passing hole, and the cutting fluid in the annular flow channel flows back into the chip removal channel through the liquid passing hole. A first spiral groove is formed in the peripheral face of the front end of the inner pipe, and cutting fluid can drive the inner pipe to rotate when flowing through the first spiral groove. The front end of the center rod is a conical head, a second spiral groove is formed in the peripheral face of the conical head, and when the cutting fluid flows back to the chip removal channel, the inner pipe drives the cutting fluid to rotate and flow along the second spiral groove, so that backward suction force is generated in the chip removal channel, and waste of the cutting fluid is avoided while chip removal is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of deep hole machining, and particularly to a boring device and a boring process for a fan main shaft. Background Art

[0002] The fan main shaft is one of the important components of a fan. Deep holes are usually machined on the fan main shaft, and chip removal in the deep holes is difficult, so the jet-suction boring machining process is usually adopted.

[0003] For example, the patent application document with the publication number CN112589153A discloses a jet-suction hole machining method. Cutting fluid, usually oil, flows in from the oil inlet. The drill bit is provided with oil through holes distributed along the circumference, and a thin-walled inner tube is arranged in the inner cavity of the drill bit, and its inner wall is a chip removal channel. When the drill bit is threadedly connected to the drill rod, an annular channel for injecting the cutting fluid is formed between the inner and outer tubes, and the cutting fluid is supplied towards the drill bit. Approximately 2 / 3 of the cutting fluid is sprayed towards the cutting edge through the oil through holes and the annular gap at the front end of the drill rod, and then flows reversely, carrying the chips through the entire inner tube and discharging backward. Another about 1 / 3 of the cutting fluid enters the injection groove inclined backward by 30° in the inner tube under high pressure, that is, the crescent-shaped nozzle, and is sprayed at an angle of 30° to promote the discharge of iron chips. The working principle of this machining method is to utilize the Venturi effect generated by the cutting fluid to generate negative pressure at the rear end of the inner tube to suck out the iron chips. However, this method requires the use of a large amount of cutting fluid and is prone to waste of the cutting fluid. Summary of the Invention

[0004] Based on this, in view of the technical problem that the current boring machining process is prone to waste of cutting fluid, it is necessary to provide a boring device and a boring process for a fan main shaft.

[0005] The above object is achieved by the following technical solutions: A boring device for a fan main shaft, including an outer tube, an inner tube, and a center rod coaxially arranged from outside to inside in sequence. The axis of the outer tube extends in the front-rear direction. The front end of the outer tube is detachably connected with a drill bit for cutting a deep hole. A fixed seat is arranged at the rear end of the outer tube, and an oil inlet and an oil outlet are arranged on the fixed seat. An annular flow channel is formed between the outer tube and the inner tube, and a chip removal channel is formed between the inner tube and the center rod. The oil inlet is communicated with the annular flow channel, and the oil outlet is communicated with the chip removal channel. A liquid passing hole is further arranged at the front end of the outer tube, and the cutting fluid in the annular flow channel flows back to the chip removal channel through the liquid passing hole. A first spiral groove is arranged on the outer peripheral surface of the front end of the inner tube, and the cutting fluid can drive the inner tube to rotate when flowing through the first spiral groove. The front end of the center rod is a conical head, and a second spiral groove is arranged on the outer peripheral surface of the conical head. When the cutting fluid flows back to the chip removal channel, the inner tube drives the cutting fluid to rotate and flow along the second spiral groove, so as to generate a backward suction force in the chip removal channel.

[0006] Further, the inner tube includes a first inner tube and a second inner tube which are fixedly connected. The first inner tube is located in front of the second inner tube. The first spiral groove is located on the outer peripheral surface of the first inner tube. An adjusting assembly is provided on the second inner tube. The adjusting assembly can drive the central rod to move back and forth, so as to adjust the size of the opening formed between the conical head and the inner wall of the first inner tube.

[0007] Further, the adjusting assembly includes an adjusting rod which extends along the radial direction of the central rod and can slide relative to the second inner tube in the front-back direction. A ring groove is provided on the outer peripheral surface of the central rod, and the axis of the ring groove is consistent with the axis of the central rod. An outer screw sleeve is rotatably provided coaxially on the outer peripheral surface of the outer tube. A third spiral groove is provided inside the outer screw sleeve. One end of the adjusting rod is located in the ring groove, and the other end is located in the third spiral groove. When the outer screw sleeve rotates relative to the outer tube, the adjusting rod slides backward under the guidance of the third spiral groove, thereby driving the central rod to slide backward.

[0008] Further, a fourth spiral groove is provided on the outer peripheral surface of the outer screw sleeve. When the cutting fluid flows through the fourth spiral groove and the rotational force generated on the outer screw sleeve is greater than the frictional force between the outer screw sleeve and the outer tube, the outer screw sleeve can rotate relative to the outer tube.

[0009] Further, a sliding groove extending in the front-back direction is provided on the second inner tube, and the adjusting rod can slide along the sliding groove.

[0010] Further, an installation ring groove is provided on the outer peripheral surface of the outer tube. The installation ring groove is coaxially arranged with the outer tube. The outer screw sleeve is rotatably arranged in the installation ring groove, and the outer screw sleeve and the installation ring groove are in a blocking fit in the front-back direction.

[0011] Further, a receiving groove extending in the front-back direction is provided on the outer tube. A compression spring is provided in the receiving groove, and the compression spring has a tendency to make the adjusting rod move forward.

[0012] Further, a guiding rod extending in the front-back direction is provided on the adjusting rod. One end of the compression spring is connected to the bottom of the receiving groove, and the other end of the compression spring is sleeved on the guiding rod.

[0013] Further, a plurality of adjusting rods are provided around the circumference of the central rod.

[0014] A boring process for a fan main shaft uses the boring equipment for the fan main shaft as described above and includes the following steps: S1, a reserved hole is opened on the fan main shaft; S2, the drill bit is aligned with the reserved hole, then the outer tube is driven to rotate and move forward, and at the same time, cutting fluid is injected into the oil inlet.

[0015] The beneficial effects of the present invention are: The boring equipment and boring process for the fan main shaft provided by the present invention are as follows. First, during the process of cutting deep holes, the cutting fluid enters through the oil inlet and all enters the annular flow channel, and then flows along the first spiral groove on the inner pipe. Due to the high flow rate of the cutting fluid, it can drive the inner pipe to rotate rapidly. Then, the cutting fluid continues to flow from the liquid passing hole to the inner wall of the deep hole. Subsequently, the cutting fluid mixed with debris flows back in the reverse direction through the gap on the drill bit to the chip removal channel. Due to the rapid rotation of the inner pipe, the inner pipe makes the cutting fluid entering the chip removal channel rotate and flow along the second spiral groove, which will generate a backward suction force in the chip removal channel, accelerating the backward flow and discharge of the cutting fluid. Compared with the prior art in which only a part of the cutting fluid enters the annular flow channel and the other part is directly discharged, the present invention can reduce the usage amount of the cutting fluid while ensuring chip removal; at the same time, since the chip removal channel can suck the cutting fluid, it can prevent the cutting fluid from leaking from the gap between the inner wall of the drill hole and the outer pipe.

[0016] Second, an adjustment assembly is provided. When the chip impurities in the cutting fluid are relatively numerous and block the chip removal channel, a large amount of cutting fluid will flow through the fourth spiral groove, enabling the outer sleeve to rotate relative to the outer pipe. The third spiral groove inside the outer sleeve guides the adjusting rod to move backward, and the adjusting rod drives the central rod to move back and forth, capable of adjusting the size of the opening formed between the conical head and the inner wall of the first inner pipe, timely expanding the opening of the chip removal channel, reducing the degree of blockage, and ensuring the smooth progress of the cutting process.

[0017] Third, the outer peripheral surface of the outer sleeve is provided with a fourth spiral groove. When the outer sleeve rotates synchronously with the outer pipe, the fourth spiral groove can prevent the cutting fluid from flowing backward, which can avoid the leakage of the cutting fluid from the gap between the inner wall of the drill hole and the outer pipe, and further avoid the waste of the cutting fluid. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the working state of the boring equipment for the fan main shaft and the fan main shaft provided by an embodiment of the present invention; Figure 2 It is a three-dimensional structure schematic diagram of the boring equipment for the fan main shaft provided by an embodiment of the present invention; Figure 3 It is a side view of the boring equipment for the fan main shaft provided by an embodiment of the present invention; Figure 4 It is Figure 3 the A - A cross-sectional view in Figure 5 It is Figure 4 the enlarged view of the structure at B in Figure 6 It is Figure 4 the enlarged view of the structure at C in Figure 7 It is Figure 4 the enlarged view of the structure at D in Figure 8Truncation schematic diagram of the boring equipment for the fan main shaft provided by an embodiment of the present invention; Figure 9 is Figure 8 The enlarged view of the structure at position E in; Figure 10 Schematic diagram of the structure of the external screw sleeve in the boring equipment for the fan main shaft provided by an embodiment of the present invention.

[0019] Wherein: 100, outer tube; 101, drill bit; 1011, liquid passing hole; 102, external screw sleeve; 1021, fourth spiral groove; 1022, third spiral groove; 103, central rod; 1031, second spiral groove; 1032, installation ring groove; 104, first inner tube; 1041, first spiral groove; 105, adjusting rod; 1051, guide rod; 106, compression spring; 107, second inner tube; 1071, limiting ring; 1072, connecting ring; 1073, pin; 110, fan main shaft; 120, fixed seat; 121, first retaining ring; 122, oil inlet; 123, oil outlet; 124, second retaining ring. Specific embodiments

[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0022] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the horizontal height of the first feature is less than that of the second feature.

[0023] As Figures 1 to 10 shown, a boring device for a fan main shaft provided by an embodiment of the present invention includes an outer tube 100, an inner tube and a central rod 103 coaxially arranged from outside to inside in sequence. The axis of the outer tube 100 extends in the front-rear direction. A drill bit 101 is detachably connected to the front end of the outer tube 100, and the drill bit 101 is used for cutting deep holes; the outer tube 100 and the drill bit 101 are threadedly connected, which is convenient for replacing the drill bit 101.

[0024] A fixed seat 120 is provided at the rear end of the outer tube 100. An oil inlet 122 and an oil outlet 123 are provided on the fixed seat 120. An annular flow channel is formed between the outer tube 100 and the inner tube, and a chip discharge channel is formed between the inner tube and the central rod 103. The oil inlet 122 is communicated with the annular flow channel, and the oil outlet 123 is communicated with the chip discharge channel; a liquid passing hole 1011 is further provided at the front end of the outer tube 100. The cutting fluid in the annular flow channel can flow through the liquid passing hole 1011 to the inner wall of the deep hole and then flow back to the chip discharge channel; a first spiral groove 1041 is provided on the outer peripheral surface of the front end of the inner tube. When the cutting fluid flows through the first spiral groove 1041, it can drive the inner tube to rotate; the front end of the central rod 103 is a conical head, and a second spiral groove 1031 is provided on the outer peripheral surface of the conical head. When the cutting fluid flows back to the chip discharge channel, the inner tube drives the cutting fluid to rotate and flow along the second spiral groove 1031, generating a backward suction force in the chip discharge channel. The cutting fluid is an oil liquid, which can cool and lubricate the tool and is used to discharge the chips generated by drilling.

[0025] As Figure 4 shown, the end of the outer tube 100 where the drill bit 101 is provided is the front end, and the other end is the rear end. As Figure 5 shown, the extending direction of the first spiral groove 1041 from the rear end to the front end is counterclockwise. Under the impact of the cutting fluid, the inner tube rotates counterclockwise, thereby promoting the cutting fluid to enter the liquid passing hole 1011. The extending direction of the second spiral groove 1031 from the rear end to the front end is also counterclockwise, enabling the cutting fluid in the chip discharge channel to flow smoothly along the second spiral groove 1031.

[0026] In the process of cutting a deep hole, all the cutting fluid enters the annular flow channel after entering from the oil inlet 122, and then flows along the first spiral groove 1041 on the inner tube. Since the flow rate of the cutting fluid is high, it can drive the inner tube to rotate rapidly. Then the cutting fluid continues to flow from the liquid passing hole 1011 to the inner wall of the deep hole. Subsequently, the cutting fluid mixed with debris flows back to the chip removal channel in the opposite direction through the gap on the drill bit 101. Due to the rapid rotation of the inner tube, the inner tube makes the cutting fluid entering the chip removal channel rotate to generate a vortex and flow along the second spiral groove 1031. In this way, a suction force backward will be generated in the chip removal channel, accelerating the backward flow and discharge of the cutting fluid. Compared with the prior art in which only a part of the cutting fluid enters the annular flow channel and the other part is directly discharged, the present invention can reduce the usage amount of the cutting fluid while ensuring chip removal; at the same time, since the chip removal channel can suck the cutting fluid, it can prevent the cutting fluid from leaking from the gap between the inner wall of the drill hole and the outer tube 100.

[0027] Further, the inner tube includes a first inner tube 104 and a second inner tube 107 which are fixedly connected. The first inner tube 104 is located in front of the second inner tube 107. The first spiral groove 1041 is located on the outer peripheral surface of the first inner tube 104. An adjusting assembly is provided on the second inner tube 107. The adjusting assembly can drive the center rod 103 to move in the front-back direction, so as to adjust the size of the opening formed between the conical head and the inner wall of the first inner tube 104. The adjusting assembly can adjust the size of the opening formed between the conical head and the inner wall of the first inner tube 104. When there are more debris impurities in the cutting fluid and the chip removal channel is blocked, the opening of the chip removal channel can be enlarged in time to reduce the degree of blockage and ensure the smooth progress of the cutting process.

[0028] Further, the adjusting assembly includes an adjusting rod 105. The adjusting rod 105 extends radially along the center rod 103 and the adjusting rod 105 can slide relative to the second inner tube 107 in the front-back direction. A ring groove is provided on the outer peripheral surface of the center rod 103. The axis of the ring groove is the same as the axis of the center rod 103. An outer screw sleeve 102 is coaxially rotatably provided on the outer peripheral surface of the outer tube 100. A third spiral groove 1022 is provided inside the outer screw sleeve 102. One end of the adjusting rod 105 is located in the ring groove and the other end is located in the third spiral groove 1022. When the outer screw sleeve 102 rotates relative to the outer tube 100, the adjusting rod 105 slides backward under the guidance of the bottom of the third spiral groove 1022, so as to drive the center rod 103 to slide backward.

[0029] Further, a fourth spiral groove 1021 is provided on the outer peripheral surface of the outer screw sleeve 102. When a large amount of cutting fluid flows through the fourth spiral groove 1021 and the rotational force generated on the outer screw sleeve 102 is greater than the frictional force between the outer screw sleeve 102 and the outer tube 100, it can drive the outer screw sleeve 102 to rotate relative to the outer tube 100. When a small amount of cutting fluid flows through the fourth spiral groove 1021, the outer screw sleeve 102 cannot rotate relative to the outer tube 100.

[0030] Specifically, a friction gasket is provided between the outer sleeve 102 and the outer peripheral surface of the outer tube 100, so that the outer tube 100 can drive the outer sleeve 102 to rotate synchronously when rotating. Specifically, Figure 2 When viewed from right to left in the figure, assuming that the rotation directions of the drill bit 101 and the outer tube 100 are both counterclockwise, the outer sleeve 102 rotates counterclockwise synchronously with the outer tube 100. Since the extension direction of the fourth helical groove 1021 from the rear end to the front end is counterclockwise, the fourth helical groove 1021 can drive the cutting fluid to flow forward, thereby preventing the cutting fluid from flowing backward, which can avoid the leakage of the cutting fluid from the gap between the inner wall of the drill hole and the outer tube 100 and further avoid the waste of the cutting fluid.

[0031] When the front end of the chip removal channel is blocked, the flow rate of the cutting fluid flowing to the outer sleeve 102 increases, so that the backward thrust force on the outer sleeve 102 increases, so that the outer sleeve 102 can rotate clockwise relative to the outer tube 100, causing the third helical groove 1022 to rotate clockwise, and then driving the adjusting rod 105 to move backward. The extension direction of the third helical groove 1022 from the rear end to the front end is counterclockwise.

[0032] Further, a chute (not shown in the figure) extending in the front-rear direction is provided on the second inner tube 107, and the adjusting rod 105 can slide back and forth along the chute. The chute can limit the distance of the forward and backward movement of the adjusting rod 105. A connecting ring 1072 is provided on the second inner tube 107, and a pin 1073 passes through the connecting ring 1072, the first inner tube 104 and the second inner tube 107 in sequence to realize the fixed connection between the first inner tube 104 and the second inner tube 107.

[0033] Further, a plurality of adjusting rods 105 are provided around the circumferential direction of the central rod 103. A limiting ring 1071 is fixedly connected to the plurality of adjusting rods 105. The front of the limiting ring 1071 is in blocking cooperation with the connecting ring 1072, and a limiting step is also provided on the second inner tube 107. The rear of the limiting ring 1071 is in blocking cooperation with the limiting step, so as to further limit the forward and backward movement distance of the adjusting rod 105.

[0034] Further, an installation ring groove 1032 is provided on the outer peripheral surface of the outer tube 100. The installation ring groove 1032 is coaxially arranged with the outer tube 100. The outer sleeve 102 is rotatably arranged in the installation ring groove 1032, and the outer sleeve 102 is in blocking cooperation with the installation ring groove 1032 in the front-rear direction. In this way, the outer sleeve 102 can only rotate on the outer tube 100 and cannot move back and forth, avoiding the cutting fluid from driving the outer sleeve 102 to move back and forth.

[0035] Further, the outer tube 100 is provided with a receiving groove extending in the front-rear direction. A compression spring 106 is arranged in the receiving groove. The compression spring 106 has a tendency to move the adjusting rod 105 forward. After the adjusting rod 105 moves backward, the compression spring 106 can drive the adjusting rod 105 to reset forward, so that the opening size between the conical head and the inner wall of the first inner tube 104 returns to the initial state.

[0036] Further, a guide rod 1051 extending in the front-rear direction is arranged on the adjusting rod 105. One end of the compression spring 106 is connected to the bottom of the receiving groove, and the other end of the compression spring 106 is sleeved on the guide rod 1051. The guide rod 1051 can prevent the compression spring 106 from being distorted, thus ensuring that the forward and backward movement of the adjusting rod 105 is smoother.

[0037] A second retaining ring 124 is arranged at the oil inlet 122, and a first retaining ring 121 is arranged at the oil outlet 123. Since a plurality of oil inlets 122 and oil outlets 123 are arranged around the circumferential direction of the outer tube 100, the arrangement of the first retaining ring 121 and the second retaining ring 124 facilitates the inflow and outflow of the cutting fluid.

[0038] Combined with the above embodiments, the working principle and process of the embodiments of the present invention are as follows: First, a reserved hole is drilled on the fan main shaft 110 using a drilling tool. Then, the drill bit 101 is aligned with the reserved hole, and the outer tube 100 is driven to move axially and rotate along its own axis, so that the outer tube 100 drives the drill bit 101 to process the reserved hole.

[0039] While processing, the cutting fluid enters the annular channel from the oil inlet 122. The high-speed flowing cutting fluid will impact the first spiral groove 1041, causing the inner tube to rotate counterclockwise. The counterclockwise rotation of the inner tube promotes the cutting fluid to flow forward at an accelerated speed and flows out through the liquid passing holes 1011 to the space between the outer tube 100 and the inner wall of the deep hole. Subsequently, a part of the cutting fluid mixed with debris flows back to the chip removal channel reversely through the gap on the drill bit 101. Due to the rapid counterclockwise rotation of the inner tube, the inner tube makes the cutting fluid entering the chip removal channel rotate counterclockwise to generate a vortex and flow along the second spiral groove 1031, which will generate a backward suction force in the chip removal channel, accelerating the backward flow and discharge of the cutting fluid.

[0040] Another part of the cutting fluid flows backward along the inner wall of the deep hole after flowing out of the liquid passing holes 1011. Since the outer sleeve 102 rotates counterclockwise synchronously with the outer tube 100, the fourth spiral groove 1021 on the outer sleeve 102 can drive the cutting fluid to flow forward, thus preventing the cutting fluid from flowing backward. This can avoid the leakage of the cutting fluid from the gap between the inner wall of the drill hole and the outer tube 100, and further avoid the waste of the cutting fluid.

[0041] When the front end of the chip removal channel is blocked due to a large amount of chips carried by the cutting fluid, the cutting fluid in the chip removal channel cannot flow smoothly. Then, a large amount of cutting fluid will flow into the fourth spiral groove 1021 of the outer sleeve 102, increasing the backward thrust on the outer sleeve 102. As a result, the outer sleeve 102 can rotate clockwise relative to the outer tube 100, causing the third spiral groove 1022 to rotate clockwise, and then driving the adjusting rod 105 to move backward. Thus, the opening formed between the conical head of the central rod 103 and the inner wall of the first inner tube 104 increases, promoting the discharge of the cutting fluid from the chip removal channel, avoiding excessive leakage of the cutting fluid near the outer sleeve 102, and finally the cutting fluid flows out from the oil outlet 123.

[0042] When the front end of the chip removal channel is no longer blocked, the compression spring 106 pushes the adjusting rod 105 to move forward and reset, and then drives the central rod 103 to reset, so that the opening formed between the conical head of the central rod 103 and the inner wall of the first inner tube 104 returns to the initial state.

[0043] Finally, after the deep hole machining is completed, stop driving the outer tube 100 to move and rotate along its own axis.

[0044] A boring process for a fan main shaft, using the above-mentioned boring equipment for the fan main shaft, includes the following steps: S1, drill a reserved hole in the fan main shaft 110; S2, align the drill bit 101 with the reserved hole, then drive the outer tube 100 to rotate and move forward, and at the same time inject cutting fluid into the oil inlet 122.

[0045] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0046] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A boring equipment for a fan main shaft, characterized in that, It includes an outer tube, an inner tube and a central rod which are coaxially arranged from outside to inside in sequence, and the axis of the outer tube extends along the front-rear direction; The front end of the outer tube is detachably connected with a drill bit for cutting deep holes; a fixed seat is arranged at the rear end of the outer tube, and an oil inlet and an oil outlet are arranged on the fixed seat. An annular flow channel is formed between the outer tube and the inner tube, and a chip discharge channel is formed between the inner tube and the central rod. The oil inlet is communicated with the annular flow channel, and the oil outlet is communicated with the chip discharge channel; a liquid passing hole is further arranged at the front end of the outer tube, and the cutting fluid in the annular flow channel flows back to the chip discharge channel through the liquid passing hole; A first spiral groove is arranged on the outer peripheral surface of the front end of the inner tube, and the cutting fluid can drive the inner tube to rotate when flowing through the first spiral groove; the front end of the central rod is a conical head, and a second spiral groove is arranged on the outer peripheral surface of the conical head. When the cutting fluid flows back to the chip discharge channel, the inner tube drives the cutting fluid to rotate and flow along the second spiral groove, so as to generate a backward suction force in the chip discharge channel.

2. The boring equipment for the fan main shaft according to claim 1, characterized in that, The inner tube includes a first inner tube and a second inner tube which are fixedly connected. The first inner tube is located in front of the second inner tube. The first spiral groove is arranged on the outer peripheral surface of the first inner tube. An adjusting assembly is arranged on the second inner tube, and the adjusting assembly can drive the central rod to move back and forth, so as to adjust the size of the opening formed between the conical head and the inner wall of the first inner tube.

3. The boring equipment for the fan main shaft according to claim 2, characterized in that, The adjusting assembly includes an adjusting rod which extends along the radial direction of the central rod and can slide relative to the second inner tube along the front-rear direction. A ring groove is arranged on the outer peripheral surface of the central rod, and the axis of the ring groove is consistent with the axis of the central rod. An outer screw sleeve is coaxially rotatably arranged on the outer peripheral surface of the outer tube, and a third spiral groove is arranged inside the outer screw sleeve. One end of the adjusting rod is located in the ring groove, and the other end is located in the third spiral groove. When the outer screw sleeve rotates relative to the outer tube, the adjusting rod slides backward under the guidance of the third spiral groove, so as to drive the central rod to slide backward.

4. The boring equipment for the fan main shaft according to claim 3, characterized in that A fourth spiral groove is arranged on the outer peripheral surface of the outer screw sleeve. When the cutting fluid flows through the fourth spiral groove and the rotational force generated on the outer screw sleeve is greater than the frictional force between the outer screw sleeve and the outer tube, the outer screw sleeve can rotate relative to the outer tube.

5. The boring equipment for the fan main shaft according to claim 4, characterized in that, A sliding groove extending along the front-rear direction is arranged on the second inner tube, and the adjusting rod can slide along the sliding groove.

6. The boring equipment for the fan main shaft according to claim 5, characterized in that, An installation ring groove is arranged on the outer peripheral surface of the outer tube and is coaxially arranged with the outer tube. The outer screw sleeve is rotatably arranged in the installation ring groove, and the outer screw sleeve and the installation ring groove are in a blocking fit in the front-rear direction.

7. The boring equipment for the fan main shaft according to claim 6, characterized in that, A receiving groove extending along the front-rear direction is arranged on the outer tube, and a compression spring is arranged in the receiving groove. The compression spring has a tendency to make the adjusting rod move forward.

8. The boring equipment for the fan main shaft according to claim 7, characterized in that, A guiding rod extending along the front-rear direction is arranged on the adjusting rod. One end of the compression spring is connected with the bottom of the receiving groove, and the other end of the compression spring is sleeved on the guiding rod.

9. The boring equipment for the fan main shaft according to claim 3, characterized in that, A plurality of adjusting rods are arranged around the circumference of the central rod.

10. A boring process for a fan main shaft, using the boring equipment for a fan main shaft according to any one of claims 1-9, characterized in that, It includes the following steps: S1, a reserved hole is opened on the main shaft of the fan; S2, the drill bit is aligned with the reserved hole, then the outer tube is driven to rotate and move forward, and cutting fluid is injected into the oil inlet at the same time.

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