A deep hole drilling guide device

Abstract

The application discloses a deep hole drilling guiding device, which comprises a mounting seat, a driving component installed on the mounting seat and comprising a mandrel, a guiding component arranged in the mandrel and provided with a channel for a drill rod assembly to pass through, and a cooling medium flow channel formed in the mounting seat, the driving component and the guiding component and used for supplying a cooling medium to a drilling area of the drill rod assembly. The deep hole drilling guiding device has the functions of driving, guiding and cooling highly integrated in a compact device, and has high integration degree. The guiding component provides the drill rod assembly with close and high-rigidity support, effectively restrains vibration and deflection, and thus ensures high machining precision. The built-in cooling medium flow channel reduces complicated exposed pipelines and improves cooling reliability.

Description

Technical Field

[0001] This application relates to the field of machine tool manufacturing technology, and more specifically, to a deep hole drilling guide device. Background Technology

[0002] Deep hole drilling technology is widely used in the machining of small-diameter deep holes for large tube sheets in nuclear power, energy, and other fields. However, in practical applications, especially in situations requiring high precision, high stability, and high efficiency, existing technologies suffer from insufficient drill rod guidance stability, making it difficult to guarantee machining accuracy. Due to the large depth-to-diameter ratio of the holes to be machined and the slender drill rods, bending vibrations and radial runout are easily generated during rotary feed. Traditional guide support methods lack sufficient rigidity, leading to instability in the drilling process, making it difficult to ensure that the straightness, roundness, and inner wall surface roughness of the holes meet the requirements of high-end processes, and also exacerbating drill bit wear. Moreover, existing cooling systems have complex piping, bulky structures, and low reliability.

[0003] Therefore, how to achieve precise guidance and stable support for the drill pipe and provide a reliable supply of cooling medium has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to disclose a deep hole drilling guide device to achieve precise guidance and stable support of the drill rod and to provide a reliable supply of cooling medium.

[0005] A deep hole drilling guide device, comprising:

[0006] Mounting base;

[0007] A drive component, mounted on the mounting base, includes a spindle;

[0008] A guide component is disposed within the mandrel and has a channel through which the drill rod assembly passes; the drive component is used to drive the mandrel and the guide component to move axially along the drill rod assembly, so that the guide component has a sealing position abutting against the workpiece and a clearance position disengaging from the workpiece.

[0009] A cooling medium channel is formed in the mounting base, the drive component, and the guide component, and the cooling medium channel is used to supply cooling medium to the drilling area of ​​the drill pipe assembly.

[0010] In one possible implementation, the drive component includes a housing and a spindle that are movable relative to each other; the housing is fixed to the mounting base, and the spindle passes through the housing;

[0011] The housing and the mandrel are formed with independent first and second driving cavities. By introducing and discharging pressurized fluid into the first and second driving cavities respectively, the mandrel is driven to generate the axial movement.

[0012] In one possible implementation, the pressure fluid is hydraulic oil, and the housing is provided with a first hydraulic oil port communicating with the first drive chamber and a second hydraulic oil port communicating with the second drive chamber.

[0013] In one possible implementation, the guide member includes a bushing fixed to one end of the mandrel near the workpiece, the bushing having an inner hole through which the drill rod assembly passes, and an end face of the bushing for abutting against the surface of the workpiece when the guide member is in the sealed position.

[0014] In one possible implementation, the guiding component further includes a first guide sleeve and a second guide sleeve sequentially disposed within the mandrel along the axial direction of the drill pipe assembly. The first guide sleeve is closer to the bushing than the second guide sleeve, and the inner holes of the first guide sleeve and the second guide sleeve engage with the outer periphery of the drill pipe assembly to achieve guidance.

[0015] In one possible implementation, a spiral groove is formed on the inner wall of the first guide sleeve and / or the second guide sleeve.

[0016] In one possible implementation, the cooling medium flow channel includes:

[0017] A media input port is provided on the mounting base;

[0018] A delivery cavity is formed within the housing and communicates with the medium input port;

[0019] The mandrel inner cavity is formed inside the mandrel and communicates with the conveying cavity;

[0020] A flow guide hole is formed in the first guide sleeve. One end of the flow guide hole is connected to the inner cavity of the mandrel, and the other end is connected to the inner hole of the bushing. There is a jet gap between the inner wall of the bushing and the outer periphery of the drill rod assembly.

[0021] In one possible implementation, the inner bore of the bushing has a flared portion located at one end of the inner bore of the bushing near the first guide sleeve.

[0022] The cross-sectional area of ​​the flared portion gradually decreases along the direction from the first guide sleeve toward the workpiece.

[0023] In one possible implementation, the flow guide hole includes:

[0024] Multiple through holes are formed on the end face of the first guide sleeve and are evenly distributed along the circumference of the first guide sleeve;

[0025] A countersunk hole is formed on the end face of the first guide sleeve facing the bushing and communicates with all the through holes; the inner cavity of the mandrel, the through holes, the countersunk hole and the inner hole of the bushing are connected in sequence.

[0026] In one possible implementation, a position detection unit is further included, which is used to detect that the spindle has moved to the avoidance position and output a positioning signal for controlling the drive component.

[0027] During operation, the deep hole drilling guide device disclosed in this application drives its mandrel to move axially along the drill rod assembly. Since the guide component is housed within the mandrel, it moves synchronously. When the guide component moves forward under drive and its front end presses tightly against the surface of the workpiece, a sealed position is reached, establishing a closed working area for drilling. During drilling, cooling medium is continuously delivered to the tip of the drill rod assembly, i.e., the drilling area, through built-in cooling medium channels. After drilling is completed, the drive component drives the mandrel and guide component backward, and the guide component detaches from the workpiece surface, reaching a clearance position for the next operation.

[0028] Compared to related technologies, the deep hole drilling guide device disclosed in this application highly integrates the three major functions of driving, guiding, and cooling into a compact device, exhibiting a high degree of structural integration. The integrated design of the guide component and the mandrel ensures strict consistency between the guiding reference and the driving direction, providing close-range, high-rigidity support for the drill rod assembly, effectively suppressing vibration and runout, thereby ensuring high machining accuracy. The built-in cooling medium flow channel reduces complex exposed piping, improves cooling reliability, and simplifies the machine tool layout. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the deep hole drilling guide device disclosed in the embodiments of this application;

[0031] Figure 2 This is a schematic diagram of the structure of the first guide sleeve disclosed in an embodiment of this application;

[0032] Figure 3 This is a cross-sectional view of the first guide sleeve disclosed in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of the structure of the second guide sleeve disclosed in an embodiment of this application;

[0034] Figure 5 This is a cross-sectional view of the second guide sleeve disclosed in an embodiment of this application.

[0035] The attached figures are labeled as follows:

[0036] 10. Deep hole drilling guide device; 20. Drill rod assembly; 30. Workpiece;

[0037] 100. Mounting bracket;

[0038] 200. Drive component; 210. Housing; 211. First hydraulic port; 212. Second hydraulic port; 220. Spindle;

[0039] 300. Guide component; 310. Bushing; 311. Flared end; 320. First guide sleeve; 330. Second guide sleeve;

[0040] 400 Cooling medium flow channel; 410 Medium inlet; 420 Conveying chamber; 430 Mandrel inner cavity; 440 Guide hole; 441 Through hole; 442 Countersunk hole;

[0041] 500. First driving cavity;

[0042] 600. Second driving cavity;

[0043] 700. Position detection unit. Detailed Implementation

[0044] The purpose of this application is to disclose a deep hole drilling guide device to achieve precise guidance and stable support of the drill rod and to provide a reliable supply of cooling medium.

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] like Figure 1 As shown, the deep hole drilling guide device 10 disclosed in this application includes a mounting base 100, a drive component 200, a guide component 300, and a cooling medium flow channel 400.

[0047] Mounting base 100 serves as the mounting foundation. The drive component 200 is mounted entirely on mounting base 100, and its internal spindle 220 is the motion output component.

[0048] The guide component 300 is assembled inside the mandrel 220, forming a moving unit with the mandrel 220. The drive component 200 drives the mandrel 220 and the guide component 300 to move together along the axial direction of the drill pipe assembly 20, that is, along the drilling direction. The guide component 300 has a through channel at its center for the drill pipe assembly 20 to pass through.

[0049] The cooling medium flow channel 400 is integrated inside the main structure of the mounting base 100, the drive component 200 and the guide component 300, forming a built-in fluid delivery network for supplying cooling medium to the drilling area of ​​the drill pipe assembly 20.

[0050] During operation, the deep hole drilling guide device 10 disclosed in this application drives the mandrel 220 to move axially along the drill rod assembly 20. Since the guide component 300 is located within the mandrel 220, it moves synchronously. When the guide component 300 moves forward under drive and its front end presses tightly against the surface of the workpiece 30, it reaches a sealed position, establishing a closed working area for drilling. During drilling, cooling medium is continuously delivered to the tip of the drill rod assembly 20, i.e., the drilling area, through the built-in cooling medium channel 400. After drilling is completed, the drive component 200 drives the mandrel 220 and guide component 300 backward, and the guide component 300 detaches from the surface of the workpiece 30, reaching a clearance position for the next operation.

[0051] Compared to related technologies, the deep hole drilling guide device 10 disclosed in this application highly integrates the three major functions of driving, guiding, and cooling into a compact device, exhibiting a high degree of structural integration. The integrated design of the guide component 300 and the spindle 220 ensures strict consistency between the guiding reference and the driving direction, providing close-range, high-rigidity support for the drill rod assembly 20, effectively suppressing vibration and runout, thereby ensuring high machining accuracy. The built-in cooling medium flow channel 400 reduces complex exposed piping, improves cooling reliability, and simplifies the machine tool layout.

[0052] Furthermore, due to its high integration and compact size, this deep hole drilling guide device can be flexibly installed in two, three or other forms in parallel on a dedicated deep hole machining equipment, thereby enabling the synchronous parallel machining of multiple deep holes on workpieces such as nuclear power tube sheets, significantly improving drilling efficiency.

[0053] The drive component 200 can be a pressure-driven linear actuator. Specifically, the drive component 200 includes a fixed housing 210 and an axially movable spindle 220. The housing 210 is fixed to the mounting base 100, and the spindle 220 is precisely inserted into the housing 210. Two non-communicating, sealed chambers, namely a first drive chamber 500 and a second drive chamber 600, are separated between the inner wall of the housing 210 and the outer wall of the spindle 220 by structures such as shoulders or sealing rings on the spindle 220. The first drive chamber 500 is closer to the workpiece 30 than the second drive chamber 600.

[0054] Controlled by an external hydraulic system, pressurized fluid is injected into the first drive chamber 500 while pressurized fluid is discharged from the second drive chamber 600. This pressure propels the mandrel 220 away from the workpiece 30. Conversely, injecting pressurized fluid into the second drive chamber 600 and discharging it from the first drive chamber 500 drives the mandrel 220 towards the workpiece 30. By controlling the intake and exhaust of pressurized fluid in the first drive chamber 500 and the second drive chamber 600 respectively, stable bidirectional linear motion of the mandrel 220 can be achieved. The pressurized fluid can be hydraulic oil or compressed air, and its function is to provide controllable pressure to the drive chambers to generate thrust. This design employs a dual-chamber fluid pressure drive, providing precise motion control and facilitating high-pressure locking in the sealing position and rapid retraction in the avoidance position.

[0055] In one specific embodiment, the pressure fluid is hydraulic oil. Using hydraulic oil as the driving medium leverages the incompressible nature of liquids to provide extremely smooth, shock-free, and enormous linear thrust, with a maximum feed force of up to 15000N. This helps ensure that the guide component 300 can stably apply a large clamping force to achieve a reliable seal. To achieve independent control of the first drive chamber 500 and the second drive chamber 600, a first hydraulic port 211 and a second hydraulic port 212 are specially machined on the outer wall of the housing 210. The first hydraulic port 211 is directly connected to the first drive chamber 500 through an oil passage inside the housing 210, while the second hydraulic port 212 is directly connected to the second drive chamber 600 through another independent oil passage. The dedicated first hydraulic port 211 and second hydraulic port 212 result in a simple and reliable structure, facilitate interface standardization, and enable rapid connection to industrial standard hydraulic systems.

[0056] To achieve a high-pressure sealing effect, the guide component 300 includes a bushing 310. The bushing 310 is fixed to the front end of the mandrel 220, i.e., the end closest to the workpiece 30. The bushing 310 has an inner hole machined at its center, the diameter of which is slightly larger than the outer diameter of the drill rod assembly 20. The front end face of the bushing 310 is precision ground to ensure flatness. When the mandrel 220 advances under drive, the bushing 310 fixed to its front end moves forward accordingly. In the sealing position, the precision-ground end face of the bushing 310 presses tightly against the surface to be machined on the workpiece 30. This provides an accurate starting position for drilling and creates a relatively sealed space between the inner hole of the bushing 310 and the drill rod assembly 20, and between the end face of the bushing 310 and the workpiece 30, preventing excessive leakage of the high-pressure cooling medium and forcing the cooling medium to flow to the drilling area, thereby ensuring sufficient cooling and lubrication.

[0057] To provide support for the drill pipe assembly 20, a first guide sleeve 320 and a second guide sleeve 330 are sequentially pressed into or fixedly installed inside the mandrel 220 along the axial direction of the drill pipe assembly 20. The structures of the first guide sleeve 320 and the second guide sleeve 330 are as follows: Figure 2 and Figure 4 As shown, the first guide sleeve 320 is closer to the front bushing 310 than the second guide sleeve 330. The inner diameters of the first guide sleeve 320 and the second guide sleeve 330 are precisely clearance-fitted with the outer diameter of the drill rod assembly 20. This clearance is small enough to provide precise radial support and guidance during drilling, while ensuring smooth operation of the high-speed rotating drill rod assembly 20 under the lubrication of cutting oil. The first guide sleeve 320 and the second guide sleeve 330 provide radial support to the drill rod assembly 20 from two different axial positions, effectively suppressing radial runout and vibration caused by the large length-to-diameter ratio of the drill rod assembly 20, significantly improving the rigidity of the drilling system, greatly reducing drill rod vibration and runout, and thus extending the service life of the drill bit and related components. This also helps to ensure the straightness, roundness, and inner wall finish of the drilled hole, improving machining quality.

[0058] To further optimize lubrication performance, continuous spiral grooves can be machined on the inner walls of the first guide sleeve 320 and the second guide sleeve 330, such as... Figure 3 and Figure 5 As shown, when a small amount of cooling medium passes through the tiny gap between the borehole wall and the drill pipe, the spiral groove guides the medium to distribute more evenly and forms a stable lubricating oil film on the rotating drill pipe surface. This improves the lubrication conditions between the first guide sleeve 320 and the second guide sleeve 330 and the high-speed rotating drill pipe, reduces friction and wear, and further extends the service life of the first guide sleeve 320 and the second guide sleeve 330.

[0059] In one specific embodiment, the cooling medium flow channel 400 includes a medium inlet 410, a delivery chamber 420, a mandrel inner cavity 430, and a guide hole 440. The medium inlet 410 is located in the mounting base 100. High-pressure cooling medium enters the delivery chamber 420 inside the housing 210 through the medium inlet 410. The delivery chamber 420 communicates with the mandrel inner cavity 430 inside the mandrel 220. At the end of the mandrel inner cavity 430, the cooling medium passes through the guide hole 440 on the first guide sleeve 320 and finally enters the inner hole of the bushing 310, and exits through the annular jet gap formed between the inner wall of the bushing 310 and the outer surface of the drill rod assembly 20. At the jet gap, due to the sharp reduction in the flow cross-section, the oil flow velocity increases dramatically, forming a high-pressure jet that directly impacts the drilling area of ​​the drill bit, providing powerful cooling and lubrication, and washing away the chips.

[0060] To facilitate chip removal and coolant recovery, the drill rod assembly 20 itself can be a hollow structure, forming a chip removal chamber inside. After cooling and lubrication, the coolant mixes with the drill chips and, under high pressure, enters the chip removal chamber inside the drill rod assembly 20 in the opposite direction. It is then forcibly discharged from the machining area along this chamber, achieving internal chip removal and waste cutting oil recovery.

[0061] This embodiment achieves a high level of reliability by placing the entire cooling medium flow channel 400 inside the deep hole drilling guide device 10, with no exposed pipes. The high-pressure jet cooling is highly efficient, rapidly removing cutting heat and preventing thermal damage to the workpiece and tool. Combined with the hollow drill rod assembly 20, it forms a complete internal chip removal system, ensuring smooth chip removal during deep hole machining and fundamentally preventing tool damage, hole wall scratches, and machining interruptions caused by chip blockage.

[0062] To optimize the flow path of the cooling medium, the inner bore of the bushing 310 is designed with a tapered or flared section 311 at its inlet end near the first guide sleeve 320. The diameter of this flared section 311 gradually decreases from the end near the first guide sleeve 320 towards the end near the workpiece 30, eventually transitioning to a straight section that mates with the drill rod. After the cooling medium flows out of the guide hole 440, it first enters the larger space of the flared section 311, which serves to collect and pre-pressurize the outflowing medium. As the medium flows towards the workpiece 30, the flow cross-section gradually decreases, which helps to stabilize and accelerate the fluid, allowing the medium to fill the entire annular jet gap more smoothly and uniformly, forming a stable and uniform jet flow, thereby improving the uniformity and reliability of cooling.

[0063] like Figure 2 and Figure 3As shown, the guide hole 440 may include a countersunk hole 442 and multiple through holes 441. The through holes 441 are small-diameter holes evenly distributed circumferentially on the end face of the first guide sleeve 320. The countersunk hole 442 is a larger-diameter annular groove or shallow cavity connecting the outlet ends of all the through holes 441. The countersunk hole 442 is machined on the end face of the first guide sleeve 320 facing the bushing 310. After the cooling medium flows out from the inner cavity 430 of the mandrel, it is first distributed into the multiple circumferentially distributed through holes 441, and then converges in the countersunk hole 442. The multiple through holes 441 ensure the flow of the cooling medium, while the countersunk hole 442 acts as a collection cavity, smoothly guiding the converged oil flow to the position where it connects to the inner hole of the bushing 310. This ensures that the cooling medium flows smoothly and uniformly circumferentially, avoiding uneven cooling caused by poor oil flow and possible stress and temperature difference deformation of the drill pipe.

[0064] To achieve full automation and precise control of the machining process, the deep hole drilling guide device also includes a position detection unit 700, which can be a limit switch or an inductive switch. The position detection unit 700 is mounted at an appropriate position on the housing 210 or mounting base 100, with its detection point located on the mandrel 220, such as the rear flange of the mandrel 220. When drilling is completed and the mandrel 220 retracts to the avoidance position under drive, the detection point on the mandrel 220 moves to the sensing position of the position detection unit 700. The position detection unit 700 immediately generates a positioning signal and sends this signal to the machine tool's control system. Upon receiving this positioning signal, the control system automatically stops the movement of the drive component 200, ensuring the mandrel 220 stops accurately in the avoidance position. This achieves full automation and precise control of the machining process, improving the automation level and operational reliability of the equipment.

[0065] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed.

[0066] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0067] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A deep hole drilling guide device, characterized in that, include: Mounting base (100); A drive component (200) is mounted on the mounting base (100) and includes a spindle (220). A guide component (300) is disposed inside the mandrel and has a channel through which the drill rod assembly (20) passes; the drive component (200) is used to drive the mandrel (220) and the guide component (300) to move axially along the drill rod assembly (20), so that the guide component (300) has a sealing position abutting against the workpiece (30) and a clearance position disengaging from the workpiece (30); A cooling medium channel (400) is formed in the mounting base (100), the drive component (200) and the guide component (300), the cooling medium channel (400) being used to supply cooling medium to the drilling area of ​​the drill pipe assembly (20).

2. The deep hole drilling guide device as described in claim 1, characterized in that, The drive component (200) includes a housing (210) and a spindle (220) that are movable relative to each other; the housing (210) is fixed to the mounting base (100), and the spindle (220) passes through the housing (210); The housing (210) and the spindle (220) have an independent first drive cavity (500) and a second drive cavity (600). By introducing and discharging pressurized fluid into the first drive cavity (500) and the second drive cavity (600) respectively, the spindle (220) is driven to generate the axial movement.

3. The deep hole drilling guide device as described in claim 2, characterized in that, The pressure fluid is hydraulic oil, and the housing (210) is provided with a first hydraulic oil port (211) communicating with the first drive chamber (500) and a second hydraulic oil port (212) communicating with the second drive chamber (600).

4. The deep hole drilling guide device as described in claim 2, characterized in that, The guide component (300) includes a bushing (310) fixed to one end of the mandrel (220) near the workpiece (30), the bushing (310) having an inner hole through which the drill rod assembly (20) passes, and the end face of the bushing (310) for abutting against the surface of the workpiece (30) when the guide component (300) is in the sealed position.

5. The deep hole drilling guide device as described in claim 4, characterized in that, The guide component (300) further includes a first guide sleeve (320) and a second guide sleeve (330) sequentially disposed in the mandrel along the axial direction of the drill pipe assembly (20). The first guide sleeve (320) is closer to the bushing (310) than the second guide sleeve (330). The inner holes of the first guide sleeve (320) and the second guide sleeve (330) cooperate with the outer periphery of the drill pipe assembly (20) to achieve guidance.

6. The deep hole drilling guide device as described in claim 5, characterized in that, Spiral grooves are formed on the inner wall of the first guide sleeve (320) and / or the second guide sleeve (330).

7. The deep hole drilling guide device as described in claim 5, characterized in that, The cooling medium flow channel (400) includes: A media input port (410) is provided on the mounting base (100). A delivery cavity (420) is formed within the housing (210) and communicates with the medium input port (410); The mandrel inner cavity (430) is formed inside the mandrel (220) and communicates with the conveying cavity (420); A guide hole (440) is provided in the first guide sleeve (320). One end of the guide hole (440) is connected to the inner cavity (430) of the mandrel, and the other end is connected to the inner hole of the bushing (310). There is a jet gap between the inner wall of the bushing (310) and the outer periphery of the drill rod assembly (20).

8. The deep hole drilling guide device as described in claim 7, characterized in that, The bushing (310) has an inner hole with a flared portion (311), which is located at one end of the inner hole of the bushing (310) near the first guide sleeve (320). The cross-sectional area of ​​the flared portion (311) gradually decreases along the direction from the first guide sleeve (320) toward the workpiece (30).

9. The deep hole drilling guide device as described in claim 7, characterized in that, The flow guide hole (440) includes: Multiple through holes (441) are formed on the end face of the first guide sleeve (320) and are evenly distributed along the circumference of the first guide sleeve (320); A countersunk hole (442) is formed on the end face of the first guide sleeve (320) facing the bushing (310) and communicates with all the through holes (441); the inner cavity of the mandrel (430), the through holes (441), the countersunk hole (442) and the inner hole of the bushing (310) are connected in sequence.

10. The deep hole drilling guide device according to any one of claims 1-9, characterized in that, It also includes a position detection unit (700), which is used to detect that the spindle (220) has moved to the avoidance position and outputs a positioning signal for controlling the drive component (200).

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