Boring and chambering tool for ship stern shaft rudder machining

Abstract

The invention relates to the technical field of shaft rudder machining, in particular to a boring and chambering tool for ship tail shaft rudder machining, which comprises a cutter and a cutter holder, the cutter holder comprises a mounting pipe, and a limiting pipe is rotatably arranged at the top end in the mounting pipe; the tool rest is arranged in the limiting pipe in a penetrating mode, one end of the tool rest is connected with a tool, the other end of the tool rest is fixedly connected with a linkage rail, and a linkage pin is arranged in the linkage rail in a sliding mode. A locking assembly; and the driving assembly comprises a connecting rod, the connecting rod is rotationally connected to the linkage pin, and the bottom end of the connecting rod is rotationally connected with a linear driving assembly. The connecting rod is driven by the linear driving mechanism to act on the linkage pin, if the linkage pin is pulled or pushed, the tool rest can move in the limiting pipe, the length of the part, extending out of the mounting pipe, of the tool rest is changed so as to meet the chambering requirements of different depths, and due to the fact that the space occupied by the tool rest is smaller than that of the mounting pipe, the tool rest is convenient to use. Therefore, the chambering requirement of a boring hole with a small hole diameter can be met.

Description

Technical Field

[0001] The invention relates to the field of shaft rudder processing, in particular to a boring and expanding tool for processing a ship tail shaft rudder. Background Art

[0002] At present, when processing the rudder blade of the tail shaft of a ship, a tapered hole must be drilled on the surface. During the process of drilling the tapered hole, it is necessary to drill the hole first. After the drilling is completed, the drilled hole is expanded. However, during the expansion process, different tools need to be replaced according to the different diameters of the tapered hole, and the length of the tool holder needs to be changed according to the depth of the hole. It is not convenient to adjust the expansion angle of a single tool and the length of the tool holder according to actual needs. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art that, during the hole expansion process, different tools need to be replaced according to the different apertures of the tapered holes, and the length of the tool holder needs to be replaced according to the depth of the hole, which makes it inconvenient to adjust the hole expansion angle of a single tool and the length of the tool holder according to actual needs. A boring and expanding tool for processing a ship's tail shaft rudder is proposed.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: In one technical solution, a boring and expanding tool for processing a ship's tail shaft rudder includes a tool and a tool holder, wherein the tool holder includes: a mounting tube, a limiting tube is rotatably provided at the top end of the mounting tube; a tool holder, the tool holder is penetrated and arranged in the limiting tube, and one end of the tool holder is connected to the tool, and the other end of the tool holder is fixedly connected to a linkage rail, and a linkage pin is slidably provided in the linkage rail; a locking assembly, the locking assembly is used to lock the insertion position of the tool holder in the limiting tube; and a driving assembly, the driving assembly includes a connecting rod, the connecting rod is rotatably connected to the linkage pin and the bottom end is rotatably connected to a linear driving assembly.

[0005] Among them, before the locking assembly locks the position of the tool holder in the limited tube, the linear drive mechanism can be used to drive the connecting rod to act on the linkage pin. If the linkage pin is pulled or pushed, as shown in the figure, the tool holder will move in the limited tube, changing the length of the tool holder extending out of the mounting tube to adapt to the needs of hole expansion of different depths. Moreover, since the space occupied by the tool holder is smaller than that of the mounting tube, it is easy to adapt to the needs of hole expansion of boring holes with smaller apertures.

[0006] After the tool holder is positioned in the limiting tube, the locking assembly is used to lock the tool holder in its plug-in position in the limiting tube, and then the linear drive assembly is used to pull or push the linkage pin, and with the cooperation of the linkage rail, the tool holder and the limiting tube can be driven to flip and adjust as a whole, so as to adjust the tool angle to meet the needs of different hole expansion shapes.

[0007] The specific angle adjustment method is as follows: After the relative positions of the tool holder and the limiting tube are locked, the connecting rod is pushed in a first direction by the linear drive assembly, and the connecting rod pushes the linkage pin, which acts on the linkage rail, and the linkage rail drives the tool holder and the limiting tube to be parallel to the mounting tube. When the tilt angle needs to be adjusted, the connecting rod is pulled in a second direction by the linear drive assembly, and the connecting rod pulls the linkage pin, which acts on the linkage rail, and the linkage rail drives the tool holder and the limiting tube to flip relative to the mounting tube until they contact the edge of the top end of the mounting tube, which is at the maximum flipping angle.

[0008] It should be further explained that there is a space between the inner cavities of the limiting tube and the mounting tube for the limiting tube to flip.

[0009] Specifically, the locking assembly includes: two limiting grooves, which are symmetrically arranged on both sides of the limiting tube; two first racks, which are symmetrically fixedly connected to both sides of the tool holder and slidably arranged inside the limiting tube; two second racks, which are respectively slidably arranged in the two limiting grooves and respectively meshed with the two first racks to form a lock; and two pushing assemblies, which are respectively arranged in the two limiting grooves and are respectively used to push the two second racks to mesh and press tightly with the two first racks.

[0010] It should be understood that when locking is required, the second rack is pushed by the pushing assembly, so that the second rack moves from the limiting groove to the inner wall of the limiting tube until it engages and presses against the second rack, thereby locking the tool holder in the limiting tube. When the length of the tool holder extending out of the mounting tube needs to be adjusted, the first rack is adjusted into the limiting groove to cancel the lock.

[0011] Specifically, the pushing assembly includes: a first motor, which is fixedly installed in the limiting groove, and the output end is fixedly connected to a pushing screw; a first threaded sleeve, which is arranged on the surface of the pushing screw, and the end is fixedly connected to the surface of the second rack.

[0012] It should be understood that when the second rack needs to be meshed and tightened with the first rack, the first motor is started, the first motor drives the push screw to rotate, the push screw thread drives the first threaded sleeve to move, and the first threaded sleeve synchronously drives the first rack close to the second rack until it meshes and tightens with the second rack to achieve locking. When the locked state needs to be canceled, the first motor is started to reversely drive the push screw to rotate, the push screw thread drives the first threaded sleeve to move, and the first threaded sleeve synchronously drives the second rack away from the first rack to cancel the locking.

[0013] Preferably, the mounting tube comprises a fixed tube and a telescopic tube, the telescopic tube is slidably inserted in the fixed tube, the inner bottom end of the telescopic tube is rotatably connected to the limiting tube, the linear drive assembly is fixedly mounted on the inner wall of the fixed tube, and a telescopic adjustment assembly is provided between the fixed tube and the telescopic tube, and the telescopic adjustment assembly is used to adjust the retraction length of the telescopic tube in the fixed tube.

[0014] It should be understood that when the tool and the mounting tube need to be extended as a whole to accommodate boring holes of different depths, if the bore diameter of the boring hole is large and the processing space is sufficient, the connecting rod is pushed to move in the first direction through the linear drive assembly, and the connecting rod synchronously pushes the tool holder through the cooperation of the linkage pin and the linkage rail. The tool holder continues to extend from the top of the limiting tube and the mounting tube until the ideal length is reached. The length of the telescopic tube extending out of the fixed tube is adjusted by the telescopic adjustment assembly, and the telescopic tube synchronously drives the limiting tube close to the connection position between the tool and the tool holder, thereby achieving the goal of extending the overall length of the tool and the mounting tube while bringing the support point of the mounting tube for the tool close to the tool, which is beneficial for maintaining stable support for the tool while meeting the boring depth.

[0015] If there is little space for boring, the connecting rod installation is directly pushed to move in the first direction through the linear drive assembly. The connecting rod pushes the tool holder synchronously through the cooperation of the linkage pin and the linkage rail. The tool holder continues to extend from the top of the limiting tube and the mounting tube until it reaches the ideal length, preparing for application scenarios with small boring space and deep depth.

[0016] Specifically, the telescopic adjustment component includes: a clearance groove, which is opened on the surface of the fixed tube and has a second threaded sleeve slidably arranged inside, the second threaded sleeve is slidably arranged in the clearance groove and fixedly connected to the surface of the telescopic tube; a first threaded adjustment component, which is used to threadably drive the second threaded sleeve to move in the clearance groove.

[0017] It should be understood that by adjusting the position of the second threaded sleeve in the clearance groove through the first threaded adjustment component, the second threaded sleeve synchronously drives the telescopic tube to move in the fixed tube, thereby adjusting the retraction length of the telescopic tube in the fixed tube.

[0018] Specifically, the first thread adjustment assembly includes: a threaded rod, which is rotatably arranged on the surface of the fixed tube and is threadedly connected to the second threaded sleeve; a second motor, which is fixedly installed on the surface of the fixed tube, and the output end is fixedly connected to the end of the threaded rod. It should be understood that the threaded rod is driven to rotate by the second motor, and the thread of the threaded rod drives the threaded sleeve to move, thereby driving the telescopic tube to move in the fixed tube.

[0019] Specifically, the linear drive assembly includes: a first slider, which is slidably disposed inside the telescopic tube and is rotatably connected to the end of the connecting rod away from the linkage pin; and an electric push rod, which is fixedly mounted on the inner wall of the fixed tube and has a pushing end fixedly connected to the first slider. It should be understood that by providing the first slider, the electric push rod is provided with sliding support in the process of pushing the connecting rod, which is conducive to improving the stability of the process of the pushing end of the electric push rod pushing the connecting rod.

[0020] In one embodiment, positions near the ends of both sides of the limiting tube are rotatably connected to support shafts, and the support shafts are rotatably connected to the inner wall of the telescopic tube.

[0021] In one embodiment, a plug-in groove is provided on the surface of the limiting tube, and the plug-in groove includes a limit groove and a clearance opening. It should be understood that by setting the limit groove, the limit groove limits the plug-in state of the tool holder, and the clearance opening makes way for the first rack. Under the limit of the limit groove, the first limit groove connected on both sides of the tool holder and the clearance opening maintain a plug-in connection without interaction force, which is conducive to avoiding the wear of the clearance opening on the first rack, which affects the locking effect in the later stage.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The present invention drives the connecting rod to act on the linkage pin through a linear drive mechanism. If the linkage pin is pulled or pushed, the tool holder will move in the limited tube, changing the length of the tool holder extending out of the mounting tube to adapt to the needs of hole expansion of different depths. In addition, since the space occupied by the tool holder is smaller than that of the mounting tube, it is easy to adapt to the needs of hole expansion of boring holes with smaller apertures.

[0023] The tool holder is locked in the insertion position in the limiting tube by the locking assembly, and then the linkage pin is pulled or pushed by the linear drive assembly. With the cooperation of the linkage rail, the tool holder and the limiting tube can be driven to flip and adjust as a whole to adjust the tool angle to meet the needs of different hole expansion shapes.

[0024] When the tool and the mounting tube need to be extended as a whole to accommodate boring holes of different depths, if the bore of the boring hole is large and the processing space is sufficient, the linear drive assembly is used to push the connecting rod to move in the first direction, and the connecting rod synchronously pushes the tool holder through the cooperation of the linkage pin and the linkage rail. The tool holder continues to extend from the top of the limiting tube and the mounting tube until the ideal length is reached. The telescopic adjustment assembly is used to adjust the length of the telescopic tube extending out of the fixed tube, and the telescopic tube synchronously drives the limiting tube close to the connection position between the tool and the tool holder, thereby extending the overall length of the tool and the mounting tube while bringing the support point of the mounting tube for the tool close to the tool, which is beneficial for maintaining stable support for the tool while meeting the boring depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a first overall structural schematic diagram of the present invention.

[0026] Figure 2 for Figure 1 Enlarged view of part A.

[0027] Figure 3 It is a schematic diagram of the structure of the limiting tube of the present invention.

[0028] Figure 4 It is a second overall structural schematic diagram of the present invention.

[0029] Figure 5 It is a structural cross-sectional view of the telescopic tube of the present invention.

[0030] Figure 6 It is a schematic structural diagram of the tool and tool holder of the present invention.

[0031] Figure 7 This is a first installation application scenario diagram of the present invention.

[0032] Figure 8 This is a second installation application scenario diagram of the present invention.

[0033] In the figure: tool 1, limiting tube 2, tool holder 3, linkage rail 4, linkage pin 5, connecting rod 6, limiting groove 7, first rack 8, second rack 9, first motor 10, pushing screw 11, first threaded sleeve 12, fixed tube 13, telescopic tube 14, make way groove 15, second threaded sleeve 16, threaded rod 17, second motor 18, first slider 19, electric push rod 20, support shaft 21, plug-in slot 23, limiting slot 2301, make way opening 2302, space 24, slide seat 25, threaded hole 26, adjusting rail 27, second threaded adjustment assembly 28, tail shaft rudder body 29, chuck 30, third threaded adjustment assembly 31, first direction a, second direction b. DETAILED DESCRIPTION

[0034] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0035] like Figures 1 to 6As shown, in one embodiment, a boring and expanding tool for processing a ship tail shaft rudder includes a tool 1 and a tool holder, the tool holder includes: a mounting tube, a limiting tube 2 is rotatably provided at the top end of the inner part of the mounting tube; a tool holder 3, the tool holder 3 is penetrated and arranged in the limiting tube 2, and one end of the tool holder 3 is connected to the tool 1, and the other end of the tool holder 3 is fixedly connected to a linkage rail 4, and a linkage pin 5 is slidably provided in the linkage rail 4; a locking assembly, the locking assembly is used to lock the insertion position of the tool holder 3 in the limiting tube 2; a driving assembly, the driving assembly includes a connecting rod 6, the connecting rod 6 is rotatably connected to the linkage pin 5 and the bottom end is rotatably connected to a linear driving assembly.

[0036] Before the locking assembly locks the tool holder 3 in the position within the limiting tube 2, the linear drive mechanism can be used to drive the connecting rod 6 to act on the linkage pin 5. If the linkage pin 5 is pulled or pushed, as shown in FIG. Figure 5 As shown, the tool holder 3 moves within the limiting tube 2, changing the length of the tool holder 3 extending out of the mounting tube to meet the needs of expanding holes of different depths. Moreover, since the space occupied by the tool holder 3 is smaller than that of the mounting tube, it is easy to meet the needs of expanding holes with smaller apertures.

[0037] After the tool holder 3 is located in the limiting tube 2, the tool holder 3 is locked in the plug-in position in the limiting tube 2 by the locking assembly, and then the linkage pin 5 is pulled or pushed by the linear drive assembly. With the cooperation of the linkage rail 4, the tool holder 3 and the limiting tube 2 can be driven to flip and adjust as a whole, so as to adjust the angle of the tool 1 to meet the needs of different hole expansion shapes.

[0038] The specific angle adjustment method is as follows: After the relative position of the tool holder 3 and the limiting tube 2 is locked, the connecting rod 6 is pushed in the first direction a by the linear drive assembly, and the connecting rod 6 pushes the linkage pin 5, which acts on the linkage rail 4, and the linkage rail 4 drives the tool holder 3 and the limiting tube 2 to be parallel to the mounting tube. When the inclination angle needs to be adjusted, the connecting rod 6 is pulled in the second direction b by the linear drive assembly, and the connecting rod 6 pulls the linkage pin 5, which acts on the linkage rail 4, and the linkage rail 4 drives the tool holder 3 and the limiting tube 2 to flip relative to the mounting tube until they contact the edge of the top end of the mounting tube and are at the maximum flipping angle.

[0039] It should be further explained that there is a space 24 between the limiting tube 2 and the inner cavity of the mounting tube, which is required for the turning of the limiting tube 2 .

[0040] like Figure 3 and Figure 5As shown, in one embodiment, the locking assembly includes: two limiting grooves 7, the two limiting grooves 7 are symmetrically opened on both sides of the limiting tube 2; two first racks 8, the two first racks 8 are symmetrically fixedly connected to the two sides of the tool holder 3, and are slidably arranged inside the limiting tube 2; two second racks 9, the two second racks 9 are respectively slidably arranged in the two limiting grooves 7 and are respectively engaged with the two first racks 8 to form a lock; two pushing assemblies, the two pushing assemblies are respectively arranged in the two limiting grooves 7, and are respectively used to push the two second racks 9 to engage with the two first racks 8 respectively.

[0041] It should be understood that when locking is required, the second rack 9 is pushed by the pushing assembly, so that the second rack 9 moves from the limiting groove 7 to the inner wall of the limiting tube 2 until it engages and presses against the second rack 9, thereby locking the tool holder 3 in the limiting tube 2. When it is necessary to adjust the length of the tool holder 3 extending out of the mounting tube, the first rack 8 is adjusted to enter the limiting groove 7 to cancel the lock.

[0042] like Figure 3 As shown, in one embodiment, the pushing assembly includes: a first motor 10, the first motor 10 is fixedly installed in the limiting groove 7, and the output end is fixedly connected to the pushing screw 11; a first threaded sleeve 12, the first threaded sleeve 12 is arranged on the surface of the pushing screw 11, and the end is fixedly connected to the surface of the second rack 9.

[0043] It should be understood that when the second rack 9 needs to be meshed and tightly pressed against the first rack 8, the first motor 10 is started, the first motor 10 drives the pushing screw 11 to rotate, the pushing screw 11 thread drives the first threaded sleeve 12 to move, and the first threaded sleeve 12 synchronously drives the first rack 8 to approach the second rack 9 until it is meshed and tightly pressed against the second rack 9 to achieve locking. When the locked state needs to be canceled, the first motor 10 is started to reversely drive the pushing screw 11 to rotate, the pushing screw 11 thread drives the first threaded sleeve 12 to move, and the first threaded sleeve 12 synchronously drives the second rack 9 away from the first rack 8 to cancel the locking.

[0044] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, in one embodiment, the mounting tube includes a fixed tube 13 and a telescopic tube 14, the telescopic tube 14 is slidably inserted in the fixed tube 13, the inner bottom end of the telescopic tube 14 is rotatably connected to the limiting tube 2, the linear drive assembly is fixedly mounted on the inner wall of the fixed tube 13, and a telescopic adjustment assembly is arranged between the fixed tube 13 and the telescopic tube 14, and the telescopic adjustment assembly is used to adjust the retraction length of the telescopic tube 14 in the fixed tube 13.

[0045] It should be understood that when the tool 1 and the mounting tube need to be extended as a whole to adapt to boring holes of different depths, if the bore diameter of the boring hole is large and the processing space is sufficient, the connecting rod 6 is pushed to move in the first direction a through the linear drive assembly, and the connecting rod 6 synchronously pushes the tool holder 3 through the cooperation of the linkage pin 5 and the linkage rail 4. The tool holder 3 continues to extend from the limiting tube 2 and the top of the mounting tube until the ideal length is reached. The telescopic adjustment assembly is used to adjust the length of the telescopic tube 14 extending out of the fixed tube 13. The telescopic tube 14 synchronously drives the limiting tube 2 to approach the connection position between the tool 1 and the tool holder 3, thereby extending the overall length of the tool 1 and the mounting tube while bringing the support point of the mounting tube to the tool 1 close to the tool 1, which is beneficial for maintaining stable support for the tool 1 while meeting the boring depth.

[0046] If there is little space for boring, the connecting rod 6 is directly pushed to move in the first direction a through the linear drive assembly. The connecting rod 6 pushes the tool holder 3 synchronously through the cooperation of the linkage pin 5 and the linkage rail 4. The tool holder 3 continues to extend from the limiting tube 2 and the top of the installation tube until it reaches the ideal length, preparing for the application scenario with small boring space and deep depth.

[0047] like Figure 1 and Figure 5 As shown, in one embodiment, the telescopic adjustment component includes: a clearance groove 15, which is opened on the surface of the fixed tube 13 and has a second threaded sleeve 16 slidably arranged inside. The second threaded sleeve 16 is slidably arranged in the clearance groove 15 and is fixedly connected to the surface of the telescopic tube 14; and a first threaded adjustment component, which is used to threadably drive the second threaded sleeve 16 to move in the clearance groove 15.

[0048] It should be understood that by adjusting the position of the second threaded sleeve 16 in the clearance groove 15 through the first threaded adjustment component, the second threaded sleeve 16 synchronously drives the telescopic tube 14 to move in the fixed tube 13, thereby adjusting the retraction length of the telescopic tube 14 in the fixed tube 13.

[0049] like Figure 1 and Figure 5 As shown, in one embodiment, the first thread adjustment assembly includes: a threaded rod 17, which is rotatably arranged on the surface of the fixed tube 13 and is threadedly connected to the second threaded sleeve 16; and a second motor 18, which is fixedly installed on the surface of the fixed tube 13, and the output end is fixedly connected to the end of the threaded rod 17. It should be understood that the threaded rod 17 is driven to rotate by the second motor 18, and the threaded sleeve is driven to move by the thread of the threaded rod 17, thereby driving the telescopic tube 14 to move in the fixed tube 13.

[0050] like Figure 4 and Figure 5As shown, in one embodiment, the linear drive assembly includes: a first slider 19, which is slidably disposed inside the telescopic tube 14 and is rotatably connected to the end of the connecting rod 6 away from the linkage pin 5; and an electric push rod 20, which is fixedly mounted on the inner wall of the fixed tube 13, and the pushing end is fixedly connected to the first slider 19. It should be understood that by providing the first slider 19, the electric push rod 20 is supported by sliding in the process of pushing the connecting rod 6, which is conducive to improving the stability of the process of the pushing end of the electric push rod 20 pushing the connecting rod 6.

[0051] like Figure 1 , Figure 2 and Figure 3 As shown, in one embodiment, positions near the ends of both sides of the limiting tube 2 are rotatably connected with support shafts 21 , and the support shafts 21 are rotatably connected to the inner wall of the telescopic tube 14 .

[0052] like Figure 3 As shown, in one embodiment, a plug-in groove 23 is provided on the surface of the limiting tube 2, and the plug-in groove 23 includes a limit groove 2301 and a clearance opening 2302. It should be understood that by setting the limit groove 2301, the limit groove 2301 limits the plug-in state of the tool holder 3, and the clearance opening 2302 makes way for the first rack 8. Under the limit of the limit groove 2301, the first limit groove 2301 connected on both sides of the tool holder 3 and the clearance opening 2302 maintain a plug-in mode without interaction force, which is conducive to avoiding the wear of the clearance opening 2302 on the first rack 8, which affects the locking effect in the later stage.

[0053] like Figure 7 and Figure 8 As shown, in one embodiment, the end of the fixed tube 13 is fixedly connected to a sliding seat 25 , and a threaded hole 26 is opened on the surface of the sliding seat 25 . Specifically, the reaming tool is installed on the adjusting rail 27 of the reaming equipment, and the tail shaft rudder body 29 is fixed to the end of the driving spindle through the chuck 30. The driving spindle drives the tail shaft rudder body 29 on the chuck 30 to rotate and cooperates with the tool 1 to reame the hole. The slide seat 25 is slidably set on the adjusting rail 27, and a second threaded adjustment component 28 is set between the slide seat 25 and the adjusting rail 27. The second threaded adjustment component 28 is threadedly connected to the threaded hole 26 and is used to adjust the position of the boring edge of the tool 1 and the tail shaft rudder body 29. It also includes a third threaded drive component 31, which is used to drive the adjusting rail 27 to move, thereby driving the tool 1 to enter the depth of the boring hole.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A boring and expanding tool for machining a ship's tail shaft rudder, comprising a tool (1) and a tool holder, characterized in that: The knife seat comprises: A mounting tube, wherein a limiting tube (2) is rotatably disposed on the top end of the mounting tube; A tool holder (3), the tool holder (3) being arranged through the limiting tube (2), one end of the tool holder (3) being connected to the tool (1), the other end of the tool holder (3) being fixedly connected to a linkage rail (4), a linkage pin (5) being slidably arranged in the linkage rail (4); A locking assembly, the locking assembly being used to lock the insertion position of the tool holder (3) in the limiting tube (2); A drive assembly, the drive assembly comprising a connecting rod (6), the connecting rod (6) being rotatably connected to a linkage pin (5) and having a bottom end rotatably connected to a linear drive assembly.

2. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 1, characterized in that: The locking assembly comprises: Two limiting grooves (7), the two limiting grooves (7) being symmetrically arranged on two sides of the limiting tube (2); Two first racks (8), the two first racks (8) are symmetrically fixedly connected to two sides of the tool holder (3) and are slidably arranged inside the limiting tube (2); Two second racks (9), the two second racks (9) are respectively slidably disposed in the two limiting grooves (7) and are respectively meshed with the two first racks (8) to form a locking state; Two pushing assemblies are respectively arranged in two limiting grooves (7) and are respectively used to push the two second racks (9) to engage with the two first racks (8) to tighten.

3. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 2, characterized in that: The pushing component comprises: A first motor (10), the first motor (10) being fixedly mounted in the limiting groove (7), and having an output end fixedly connected to a pushing screw (11); A first threaded sleeve (12), wherein the first threaded sleeve (12) is arranged on the surface of the pushing screw (11), and an end portion is fixedly connected to the surface of the second rack (9).

4. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 3, characterized in that: The mounting tube comprises a fixed tube (13) and a telescopic tube (14); the telescopic tube (14) is slidably inserted in the fixed tube (13); the inner bottom end of the telescopic tube (14) is rotatably connected to the limiting tube (2); the linear drive assembly is fixedly mounted on the inner wall of the fixed tube (13); a telescopic adjustment assembly is provided between the fixed tube (13) and the telescopic tube (14); the telescopic adjustment assembly is used to adjust the retraction length of the telescopic tube (14) in the fixed tube (13).

5. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 4, characterized in that: The telescopic adjustment component comprises: a clearance groove (15), the clearance groove (15) being formed on the surface of the fixed tube (13), and having a second threaded sleeve (16) slidably arranged inside, the second threaded sleeve (16) being fixedly connected to the surface of the telescopic tube (14); A first thread adjustment component, wherein the first thread adjustment component is used to threadably drive the second thread sleeve (16) to move in the clearance groove (15).

6. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 5, characterized in that: The first thread adjustment assembly comprises: a threaded rod (17), the threaded rod (17) being rotatably disposed on the surface of the fixed tube (13) and being threadably connected to the second threaded sleeve (16); A second motor (18), the second motor (18) is fixedly mounted on the surface of the fixed tube (13), and an output end is fixedly connected to the end of the threaded rod (17).

7. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 6, characterized in that: The linear drive assembly comprises: A first sliding block (19), the first sliding block (19) being slidably disposed inside the telescopic tube (14) and being rotatably connected to an end of the connecting rod (6) away from the linkage pin (5); An electric push rod (20), the electric push rod (20) is fixedly mounted on the inner wall of the fixed tube (13), and a pushing end is fixedly connected to the first sliding block (19).

8. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 7, characterized in that: Both sides of the limiting tube (2) are rotatably connected to support shafts (21) near the ends, and the support shafts (21) are rotatably connected to the inner wall of the telescopic tube (14).

9. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 8, characterized in that: A plug-in groove (23) is provided on the surface of the limiting tube (2), and the plug-in groove (23) comprises a limiting groove (2301) and a clearance opening (2302).

10. The boring and expanding tool for machining a ship's tail shaft rudder according to claim 9, characterized in that: The end of the fixed tube (13) is fixedly connected to a sliding seat (25), and a threaded hole (26) is provided on the surface of the sliding seat (25).

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