Boring equipment and boring process for fan main shaft

Abstract

The present invention relates to the field of deep hole processing technology, and specifically to a boring device and a boring process for a blower main shaft. The boring device for the blower main shaft comprises an outer tube, an inner tube and a center rod. A fixed seat is provided at the rear end of the outer tube, and an oil inlet and an oil outlet are provided 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 connected with the annular flow channel, and the oil outlet is connected with the chip removal channel. A liquid hole is also provided on the outer tube, and the cutting fluid in the annular flow channel flows back to the chip removal channel through the liquid hole. A first spiral groove is provided on the outer circumferential 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 provided on the outer circumferential 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 that a backward suction force is generated in the chip removal channel, thereby realizing chip removal while avoiding waste of cutting fluid.

Description

Technical Field

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

[0002] The fan main shaft is one of the most important components of the fan. Deep holes are usually required in the fan main shaft, but chip removal is difficult in deep holes, so the ejector-suction boring process is usually used.

[0003] For example, patent application document CN112589153A discloses a jet-suction hole machining method in which cutting fluid, typically oil, flows in through an oil inlet. The drill bit is provided with circumferentially distributed oil holes, and the inner cavity of the drill bit is provided with a thin-walled inner tube, the inner wall of which serves as a chip removal channel. When the drill bit and drill rod are threaded together, an annular channel is formed between the inner and outer tubes for the cutting fluid to flow in. Cutting fluid is supplied toward the drill bit. Approximately two-thirds of the cutting fluid is sprayed toward the cutting edge through the oil holes and the annular gap at the front end of the drill rod. It then flows in the opposite direction, carrying the chips through the entire inner tube and outward. Another approximately one-third of the cutting fluid, under high pressure, enters a 30°-inclined spray slot in the inner tube, i.e., a crescent-shaped nozzle, and is ejected at a 30° angle, thereby promoting the discharge of the chips. This machining method utilizes the Venturi effect of the cutting fluid, generating negative pressure at the rear end of the inner tube to draw out the chips. However, this method requires a large amount of cutting fluid, which can easily lead to waste. Summary of the Invention

[0004] Based on this, it is necessary to provide a boring device and a boring process for a fan main shaft in order to address the technical problem that the current boring processing technology easily causes waste of cutting fluid.

[0005] The above purpose is achieved through the following technical solutions:

[0006] The cam is provided with a plurality of holes, the holes being arranged on the front and rear sides of the cam, and the holes being connected to the inner and outer sides of the cam, so that the cam can be rotated and the cutting fluid can be sucked out of the cam.

[0007] Furthermore, the inner tube includes a first inner tube and a second inner tube fixedly connected, the first inner tube is located in front of the second inner tube, the first spiral groove is located on the outer circumferential surface of the first inner tube, and the second inner tube is provided with an adjustment component, which can drive the center rod to move back and forth, thereby adjusting the size of the opening formed between the conical head and the inner wall of the first inner tube.

[0008] Furthermore, the adjustment assembly includes an adjustment rod, which extends radially along the center rod and can slide in the front-to-rear direction relative to the second inner tube. An annular groove is provided on the outer circumference of the center rod, and the axis of the annular groove is consistent with the axis of the center rod. An outer screw sleeve is coaxially rotated on the outer circumference of the outer tube, and a third spiral groove is provided inside the outer screw sleeve. One end of the adjustment rod is located in the annular groove, and the other end is located in the third spiral groove. When the outer screw sleeve rotates relative to the outer tube, the adjustment rod slides backward under the guidance of the third spiral groove, thereby driving the center rod to slide backward.

[0009] Furthermore, the outer peripheral surface of the outer screw sleeve is provided with a fourth spiral groove. When the cutting fluid flows through the fourth spiral groove and the rotational force generated on the outer screw sleeve is greater than the friction force between the outer screw sleeve and the outer tube, the outer screw sleeve can rotate relative to the outer tube.

[0010] Furthermore, the second inner tube is provided with a sliding groove extending in the front-to-back direction, and the adjusting rod can slide along the sliding groove.

[0011] Furthermore, the outer circumference of the outer tube is provided with a mounting ring groove, which is coaxially arranged with the outer tube. The outer screw sleeve is rotatably arranged in the mounting ring groove, and the outer screw sleeve and the mounting ring groove are stopped and matched in the front-to-back direction.

[0012] Furthermore, the outer tube is provided with a receiving groove extending in the front-to-back direction, and a compression spring is provided in the receiving groove, and the compression spring has a tendency to move the adjusting rod forward.

[0013] Furthermore, the adjusting rod is provided with a guide rod extending in the front-rear direction, one end of the compression spring is connected to the bottom of the accommodating groove, and the other end of the compression spring is sleeved on the guide rod.

[0014] Furthermore, a plurality of adjusting rods are provided around the circumference of the central rod.

[0015] A fan main shaft boring process, using the above-mentioned fan main shaft boring equipment, comprises the following steps:

[0016] S1, open a reserved hole on the fan main shaft;

[0017] S2, makes the drill bit correspond to the reserved hole, then drives the outer tube to rotate and move forward, and at the same time injects cutting fluid into the oil inlet.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a boring device and a boring process for a fan main shaft. First, during the deep hole cutting process, the cutting fluid enters the annular flow channel after entering from the oil inlet, and then flows along the first spiral groove on the inner tube. Due to the high flow rate of the cutting fluid, the inner tube can be driven to rotate rapidly, and then the cutting fluid continues to flow from the liquid hole to the inner wall of the deep hole. Subsequently, the cutting fluid mixed with the debris flows back to the chip removal channel through the gap on the drill bit. Due to the rapid rotation of the inner tube, the inner tube causes the cutting fluid entering the chip removal channel to rotate and flow along the second spiral groove. This 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 amount of cutting fluid used 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.

[0020] Second, an adjustment component is set. When there are too many debris and impurities in the cutting fluid and the chip removal channel is blocked, a large amount of cutting fluid will flow through the fourth spiral groove, so that the outer sleeve can rotate relative to the outer tube. The third spiral groove inside the outer sleeve guides the adjustment rod to move backward, and the adjustment rod drives the center rod to move forward and backward. It can adjust the size of the opening formed between the conical head and the inner wall of the first inner tube, timely expand the opening of the chip removal channel, reduce the degree of blockage, and ensure the smooth progress of the cutting process.

[0021] Third, a fourth spiral groove is provided on the outer peripheral surface of the outer screw sleeve. When the outer screw sleeve rotates synchronously with the outer tube, the fourth spiral groove can prevent the cutting fluid from flowing backward, thereby preventing the cutting fluid from leaking from the gap between the inner wall of the borehole and the outer tube, further avoiding waste of cutting fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the working state of a fan main shaft boring device and the fan main shaft provided in one embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the three-dimensional structure of a fan main shaft boring device provided in one embodiment of the present invention;

[0024] Figure 3 A side view of a fan main shaft boring device provided in one embodiment of the present invention;

[0025] Figure 4 for Figure 3 Middle AA section view;

[0026] Figure 5 for Figure 4 A magnified view of the structure at point B in the middle;

[0027] Figure 6for Figure 4 A magnified view of the structure at point C in the middle;

[0028] Figure 7 for Figure 4 A magnified view of the structure at point D in the middle;

[0029] Figure 8 A truncated schematic diagram of a fan main shaft boring device provided in one embodiment of the present invention;

[0030] Figure 9 for Figure 8 Enlarged view of the structure at E in the middle;

[0031] Figure 10 A schematic structural diagram of an external threaded sleeve in a boring device for a fan main shaft provided in one embodiment of the present invention.

[0032] in:

[0033] 100. Outer tube; 101. Drill bit; 1011. Liquid hole; 102. Outer sleeve; 1021. Fourth spiral groove; 1022. Third spiral groove; 103. Center rod; 1031. Second spiral groove; 1032. Mounting 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. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, 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 intended to limit the present invention.

[0035] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0036] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] like Figures 1 to 10 As shown, an embodiment of the present invention provides a boring device for a fan main shaft, comprising an outer tube 100, an inner tube and a center rod 103 coaxially arranged from the outside to the inside, the axis of the outer tube 100 extending in the front-to-back direction, and a drill bit 101 detachably connected to the front end of the outer tube 100, the drill bit 101 being used for cutting deep holes; the outer tube 100 and the drill bit 101 are threadedly connected to each other, which facilitates the replacement of the drill bit 101.

[0038] The rear end of the outer tube 100 is provided with a fixed seat 120, and the fixed seat 120 is provided with an oil inlet 122 and an oil outlet 123. An annular flow channel is formed between the outer tube 100 and the inner tube, and a chip removal channel is formed between the inner tube and the center rod 103. The oil inlet 122 is connected to the annular flow channel, and the oil outlet 123 is connected to the chip removal channel; the front end of the outer tube 100 is also provided with a liquid hole 1011, and the cutting fluid in the annular flow channel can flow to the inner wall of the deep hole through the liquid hole 1011 and return to the chip removal channel; the outer circumferential surface of the front end of the inner tube is provided with a first spiral groove 1041, and the cutting fluid can drive the inner tube to rotate when flowing through the first spiral groove 1041; the front end of the center rod 103 is a conical head, and the outer circumferential surface of the conical head is provided with a second spiral groove 1031. When the cutting fluid returns to the chip removal channel, the inner tube drives the cutting fluid to rotate and flow along the second spiral groove 1031, so that a backward suction force is generated in the chip removal channel. The cutting fluid is oil, which can cool and lubricate the tool and is used to discharge chips generated by drilling.

[0039] like Figure 4 As shown, one end of the outer tube 100 provided with a drill bit 101 is the front end, and the other end is the rear end. Figure 5 As shown, the first spiral groove 1041 extends counterclockwise from the rear end to the front end. Under the impact of the cutting fluid, the inner tube rotates counterclockwise, thereby promoting the cutting fluid to enter the liquid hole 1011. The second spiral groove 1031 also extends counterclockwise from the rear end to the front end, allowing the cutting fluid in the chip removal channel to flow smoothly around the second spiral groove 1031.

[0040] In this way, during the deep hole cutting process, 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. Due to the high flow rate of the cutting fluid, the inner tube can be driven to rotate rapidly, and then the cutting fluid continues to flow from the liquid hole 1011 to the inner wall of the deep hole. Subsequently, the cutting fluid mixed with the debris flows back to the chip removal channel through the gap on the drill bit 101. Due to the rapid rotation of the inner tube, the inner tube causes the cutting fluid entering the chip removal channel to rotate to generate a vortex and flow along the second spiral groove 1031. This will generate a backward suction force in the chip removal channel, accelerating the backward flow of the cutting fluid and discharge. Compared with the prior art, 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 amount of cutting fluid used 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 borehole and the outer tube 100.

[0041] Furthermore, the inner tube includes a first inner tube 104 and a second inner tube 107 that 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 circumferential surface of the first inner tube 104. The second inner tube 107 is provided with an adjustment assembly that can drive the center rod 103 to move in the front-to-back direction, thereby adjusting the size of the opening formed between the conical head and the inner wall of the first inner tube 104. The adjustment assembly can adjust the size of the opening formed between the conical head and the inner wall of the first inner tube 104. When a large amount of debris and impurities in the cutting fluid blocks the chip removal channel, the opening of the chip removal channel is promptly expanded to reduce the degree of blockage and ensure the smooth progress of the cutting process.

[0042] Furthermore, the adjustment component includes an adjustment rod 105, which extends radially along the center rod 103 and can slide in the front-to-rear direction relative to the second inner tube 107. An annular groove is provided on the outer circumference of the center rod 103, and the axis of the annular groove is consistent with the axis of the center rod 103. An outer screw sleeve 102 is coaxially rotated on the outer circumference of the outer tube 100, and a third spiral groove 1022 is provided inside the outer screw sleeve 102. One end of the adjustment rod 105 is located in the annular 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 adjustment rod 105 slides backward under the guidance of the bottom of the third spiral groove 1022, thereby driving the center rod 103 to slide backward.

[0043] Furthermore, the outer circumferential surface of the outer screw sleeve 102 is provided with a fourth spiral groove 1021. 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 friction force between the outer screw sleeve 102 and the outer tube 100, the outer screw sleeve 102 can be driven 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.

[0044] Specifically, a friction pad is provided between the outer circumference of the outer screw sleeve 102 and the outer circumference of the outer tube 100, so that the outer tube 100 can drive the outer screw sleeve 102 to rotate synchronously when rotating. Figure 2 Assuming that the rotation direction of the drill bit 101 and the outer tube 100 is counterclockwise when viewed from right to left, the outer screw sleeve 102 rotates counterclockwise synchronously with the outer tube 100. Since the fourth spiral groove 1021 extends counterclockwise from the rear end to the front end, the fourth spiral groove 1021 can drive the cutting fluid to flow forward, thereby preventing the cutting fluid from flowing backward, thereby preventing the cutting fluid from leaking from the gap between the inner wall of the drill hole and the outer tube 100, further avoiding waste of the cutting fluid.

[0045] When the front end of the chip removal channel is clogged, the flow rate of the cutting fluid flowing to the outer screw sleeve 102 increases, causing the outer screw sleeve 102 to be subjected to an increased backward thrust force, thereby allowing the outer screw sleeve 102 to rotate clockwise relative to the outer tube 100, causing the third spiral groove 1022 to rotate clockwise, thereby driving the adjustment rod 105 to move backward. The third spiral groove 1022 extends counterclockwise from the rear end to the front end.

[0046] Furthermore, the second inner tube 107 is provided with a slide groove (not shown) extending in the front-to-back direction, along which the adjustment rod 105 can slide back and forth. The slide groove limits the distance that the adjustment rod 105 can move back and forth. The second inner tube 107 is provided with a connecting ring 1072, and a pin 1073 passes through the connecting ring 1072, the first inner tube 104, and the second inner tube 107 in sequence, thereby securely connecting the first inner tube 104 and the second inner tube 107.

[0047] Furthermore, a plurality of adjustment rods 105 are provided around the circumference of the central rod 103. A limiting ring 1071 is fixedly connected to the plurality of adjustment rods 105. The front of the limiting ring 1071 is engaged with the connecting ring 1072 for a stop. A limiting step is also provided on the second inner tube 107. The rear of the limiting ring 1071 is engaged with the limiting step for a stop, thereby further limiting the forward and backward movement distance of the adjustment rod 105.

[0048] Furthermore, the outer circumferential surface of the outer tube 100 is provided with a mounting annular groove 1032, which is coaxially arranged with the outer tube 100. The outer screw sleeve 102 is rotatably arranged in the mounting annular groove 1032, and the outer screw sleeve 102 and the mounting annular groove 1032 are engaged in a front-to-back direction. In this way, the outer screw sleeve 102 can only rotate on the outer tube 100 and cannot move forward and backward, thereby preventing the cutting fluid from driving the outer screw sleeve 102 to move forward and backward.

[0049] Furthermore, the outer tube 100 is provided with a receiving groove extending in the front-to-back direction, in which a compression spring 106 is disposed. The compression spring 106 has a tendency to move the adjustment rod 105 forward. After the adjustment rod 105 moves backward, the compression spring 106 can drive the adjustment rod 105 to return forward, thereby restoring the opening between the conical head and the inner wall of the first inner tube 104 to its initial size.

[0050] Furthermore, the adjusting rod 105 is provided with a guide rod 1051 extending in the front-to-back direction, 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 twisting and deforming, thereby ensuring smoother front-to-back movement of the adjusting rod 105.

[0051] The oil inlet 122 is provided with a second baffle ring 124, and the oil outlet 123 is provided with a first baffle ring 121. Since multiple oil inlets 122 and oil outlets 123 are provided around the circumference of the outer tube 100, the first baffle ring 121 and the second baffle ring 124 facilitate the inflow and outflow of cutting fluid.

[0052] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0053] First, a drilling tool is used to drill a reserved hole on the fan main shaft 110, and then the drill bit 101 is aligned with the reserved hole to drive the outer tube 100 to move and rotate along its own axis, so that the outer tube 100 drives the drill bit 101 to process the reserved hole.

[0054] During machining, the cutting fluid enters the annular channel from the oil inlet 122, and 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 accelerate forward flow, and flows through the liquid hole 1011 to the space between the outer tube 100 and the inner wall of the deep hole. Then, a part of the cutting fluid mixed with the debris flows back into the chip removal channel through the gap on the drill bit 101. Due to the rapid counterclockwise rotation of the inner tube, the inner tube causes the cutting fluid entering the chip removal channel to 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 of the cutting fluid and discharge.

[0055] Another part of the cutting fluid flows out from the liquid hole 1011 and flows backward along the inner wall of the deep hole. 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, thereby preventing the cutting fluid from flowing backward. This can prevent the cutting fluid from leaking from the gap between the inner wall of the drill hole and the outer tube 100, further avoiding waste of cutting fluid.

[0056] When the front end of the chip removal channel is blocked due to the cutting fluid carrying a lot of debris, the cutting fluid in the chip removal channel cannot flow smoothly, then a large amount of cutting fluid will flow to the fourth spiral groove 1021 of the outer screw sleeve 102, causing the outer screw sleeve 102 to be subjected to an increased backward thrust, so that the outer screw sleeve 102 can rotate clockwise relative to the outer tube 100, causing the third spiral groove 1022 to rotate clockwise, thereby driving the adjusting rod 105 to move backward, thereby increasing the opening formed between the conical head of the center rod 103 and the inner wall of the first inner tube 104, promoting the discharge of cutting fluid from the chip removal channel, avoiding excessive leakage of cutting fluid from near the outer screw sleeve 102, and finally the cutting fluid flows out from the oil outlet 123.

[0057] When the front end of the chip removal channel is no longer blocked, the compression spring 106 pushes the adjustment rod 105 forward and resets, thereby driving the center rod 103 to reset, so that the opening formed between the conical head of the center rod 103 and the inner wall of the first inner tube 104 returns to its original state.

[0058] Finally, after the deep hole processing is completed, the outer tube 100 is stopped from moving and rotating along its own axial direction.

[0059] A fan main shaft boring process, using the above-mentioned fan main shaft boring equipment, comprises the following steps:

[0060] S1, opening a reserved hole on the fan main shaft 110;

[0061] S2, make the drill bit 101 correspond to 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.

[0062] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A boring device for a fan main shaft, characterized in that: It comprises an outer tube, an inner tube and a center rod coaxially arranged in sequence from the outside to the inside, wherein the axis of the outer tube extends in the front-to-back direction; The front end of the outer tube is detachably connected to a drill bit, which is used for cutting deep holes; the rear end of the outer tube is provided with a fixing seat, and the fixing seat is provided with an oil inlet and an oil outlet. 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 connected to the annular flow channel, and the oil outlet is connected to the chip removal channel. The front end of the outer tube is also provided with a liquid hole, and the cutting fluid in the annular flow channel flows back to the chip removal channel through the liquid hole. The outer circumference of the front end of the inner tube is provided with a first spiral groove, and when the cutting fluid flows through the first spiral groove, it can drive the inner tube to rotate; the front end of the center rod is a conical head, and the outer circumference of the conical head is provided with a second spiral groove. 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 that a backward suction force is generated in the chip removal channel. The inner tube includes a first inner tube and a second inner tube that are fixedly connected. The first inner tube is located in front of the second inner tube, and the first spiral groove is located on the outer circumference of the first inner tube. The second inner tube is provided with an adjustment component, and the adjustment component can drive the center rod to move back and forth, thereby adjusting the size of the opening formed between the conical head and the inner wall of the first inner tube. The adjustment component includes an adjustment rod The adjusting rod extends radially along the center rod, and the adjusting rod can slide in the front and rear directions relative to the second inner tube, and the outer circumferential surface of the center rod is provided with an annular groove, the axis of the annular groove is consistent with the axis of the center rod, and the outer circumferential surface of the outer tube is provided with an outer screw sleeve that rotates coaxially, and the interior of the outer screw sleeve is provided with a third spiral groove, one end of the adjusting rod is located in the annular 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 center rod to slide backward, and the outer circumferential surface of the outer screw sleeve is provided with a fourth spiral groove. When the cutting fluid flows through the fourth spiral groove and the rotational force generated on the outer screw sleeve is greater than the friction force between the outer screw sleeve and the outer tube, the outer screw sleeve can rotate relative to the outer tube.

2. The boring device for the fan main shaft according to claim 1, characterized in that: The second inner tube is provided with a sliding groove extending in the front-to-back direction, and the adjusting rod can slide along the sliding groove.

3. The boring device for the fan main shaft according to claim 2, characterized in that: The outer circumference of the outer tube is provided with a mounting ring groove, which is coaxially arranged with the outer tube. The outer screw sleeve is rotatably arranged in the mounting ring groove, and the outer screw sleeve and the mounting ring groove are blocked and matched in the front-back direction.

4. The boring device for the fan main shaft according to claim 3, characterized in that: The outer tube is provided with a receiving groove extending in the front-to-back direction. A compression spring is provided in the receiving groove. The compression spring has a tendency to cause the adjusting rod to move forward.

5. The boring device for the fan main shaft according to claim 4, characterized in that: The adjusting rod is provided with a guide rod extending in the front-rear direction, one end of the compression spring is connected to the bottom of the accommodating groove, and the other end of the compression spring is sleeved on the guide rod.

6. The boring device for the fan main shaft according to claim 1, characterized in that: The adjusting rods are provided in a plurality around the circumference of the central rod.

7. A fan main shaft boring process, using the fan main shaft boring equipment according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, open a reserved hole on the fan main shaft; S2, makes the drill bit correspond to the reserved hole, then drives the outer tube to rotate and move forward, and at the same time injects cutting fluid into the oil inlet.

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