Friction plug repair welding spindle head

Abstract

The application discloses a friction plug repair welding main shaft head, which comprises a main shaft head body, a tool shank and a clamping structure, the main shaft head body comprises an output shaft, the split fastening sleeve comprises two fasteners, each fastener comprises an arc-shaped fastening part, and the arc-shaped fastening parts of the two fasteners form a ring column structure when the two fasteners are closed; the end of the tool shank body is formed with a blind hole, the shape of the blind hole is matched with the outer contour of the split fastening sleeve when the two fasteners are closed, and the split fastening sleeve after the two fasteners are closed is located in the blind hole; the lock nut is sleeved on the outer tool shank body in an open mode and is in threaded connection with the outer tool shank body; the clamping structure comprises a clamp and a locking piece, the clamp is installed on the outer shell of the main shaft head body, and the clamp is sleeved on the output shaft. The friction plug repair welding main shaft head can realize quick separation of the plug and the tool shank, the output shaft can be fixed with the assistance of the clamping structure, and therefore the tool and the plug can be quickly replaced.

Description

Technical Field

[0001] This invention belongs to the field of pull-out friction plug repair welding technology, specifically relating to a friction plug repair welding spindle head. Background Technology

[0002] The rocket propellant tank is a critical structural component of the rocket, primarily used to store propellant and support the rocket body structure. It typically consists of a front and rear tank bottom and multiple intermediate sections. Tungsten inert gas welding (TIG) or friction stir welding is commonly used in the manufacturing of the circumferential welds between the tank bottom and the sections, as well as between the sections. However, regardless of the welding method used, there is a risk of welding defects. Pull-out friction plug welding, as a solid-state joining technology, offers advantages such as low heat input, minimal post-weld deformation, and high automation. Furthermore, it eliminates the need for a support structure on the back of the propellant tank, making it particularly suitable for repairing defects in large, thin-walled, hollow structural components like rocket propellant tanks.

[0003] According to the requirements of the pull-out friction plug repair welding process, before repair welding, holes must be drilled in the defective areas on the outer surface of the rocket propellant tank to form plug holes. Then, a plug rod is used to weld the plug holes. To ensure reliable transmission of torque and axial force during welding, the plug rod is typically connected to the tool holder via a threaded connection. However, after the rocket propellant tank repair welding is completed, this connection method leaves the plug rod and tool holder still connected, making effective separation difficult and posing significant challenges to subsequent processes. Specifically, after welding, the plug rod and tool holder usually need to be separated by cutting. However, due to the complex internal structure of the repair welding equipment and the limited working space between the rocket propellant tank and the tool holder, the arrangement and operation of the cutting tools are significantly restricted, making the cutting operation very difficult. Furthermore, forced cutting may damage the weld joint or even cause welding failure, seriously affecting the overall safety and reliability of the rocket propellant tank structure. Furthermore, due to the large size of the welding equipment and rocket propellant tanks, it is impossible to unscrew the plug rod from the tool holder by rotating the welding equipment or rocket propellant tank. This makes the threaded connection-based disassembly method difficult to implement in practical engineering applications, thus restricting the engineering application of pull-out friction plug welding technology in large structures such as rocket propellant tanks. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a friction plug repair welding spindle head.

[0005] The objective of this invention is achieved through the following technical solutions.

[0006] A friction plug repair welding spindle head includes: a spindle head body, a tool holder and a clamping structure. The spindle head body includes: an output shaft, which extends from one end of the spindle head body and can simultaneously perform axial linear reciprocating motion and rotational motion.

[0007] The knife handle includes: the knife handle body, a lock nut, and a separate fastening sleeve, wherein:

[0008] The split fastening sleeve includes two fasteners, each of which includes an arc-shaped fastening part and a protrusion. The arc-shaped fastening part is a semi-circular arc surface. When the two fasteners are engaged, the arc-shaped fastening parts of the two fasteners form a ring column structure. The protrusion of each fastener is arranged along the axial direction of the ring column structure and fixed on the outer ring surface of the ring column structure.

[0009] One end of the tool holder body serves as the first connecting end, which is fixed to the output shaft end of the spindle head body. The other end of the tool holder body serves as the second connecting end, which has a blind hole. The shape of the blind hole is compatible with the outer contour of the split fastening sleeve when the two fasteners are engaged. The split fastening sleeve after the two fasteners are engaged is located in the blind hole. The axial length of the split fastening sleeve is compatible with the axial length of the blind hole. The protrusion prevents the split fastening sleeve from rotating in the blind hole.

[0010] The lock nut has a cylindrical cavity inside. One end of the lock nut has an opening, and the other end has a mounting hole. The lock nut fits over the second connecting end of the tool holder body through the opening and is threaded to the second connecting end. The shape of the mounting hole is the same as the cross-sectional shape of the outer contour of the split fastening sleeve, and the shape of the mounting hole is slightly larger than the cross-sectional shape of the outer contour of the split fastening sleeve. When the lock nut is rotated until the shape of the mounting hole is opposite to the cross-section of the outer contour of the split fastening sleeve, the split fastening sleeve can pass through the lock nut. When the lock nut is rotated until the shape of the mounting hole is not opposite to the cross-section of the outer contour of the split fastening sleeve, the lock nut limits the split fastening sleeve to the blind hole.

[0011] The annular structure formed by the arc-shaped fastening parts of the two fasteners has internal threads inside. The annular structure is used to accommodate a cutting tool or a stopper bar and is connected to the cutting tool or the stopper bar through its internal threads.

[0012] The clamping structure includes a clamp and a locking element. The clamp is installed on the outer shell of the spindle head body, and the locking element is used to lock the clamp. The clamp is sleeved on the output shaft. When the clamp is not locked, the clamp does not contact the output shaft; when the clamp is locked, the clamp limits the rotation of the output shaft.

[0013] In the above technical solution, the protrusion includes an upper protrusion and a lower protrusion. When the arc-shaped fastening portions of the two fasteners form a ring-shaped structure, the upper protrusions of the two fasteners contact each other, and the lower protrusions of the two fasteners contact each other.

[0014] In the above technical solution, the annular columnar structure is divided into two sections along its axial direction: one section is a threaded section composed of internal threads, and the other section is a smooth section.

[0015] In the above technical solution, the external thread on the second connecting end used for connection with the lock nut thread is a trapezoidal thread.

[0016] In the above technical solution, a groove is formed on the bottom of the blind hole in the second connecting end, the bottom of the groove is connected to one end of a compression spring, and the other end of the compression spring is connected to a spring washer.

[0017] In the above technical solution, a shock-absorbing washer is installed inside the mounting hole of the lock nut.

[0018] In the above technical solution, a flange is fixedly mounted on the first connecting end of the tool holder body for fixing to the output shaft of the spindle head body.

[0019] In the above technical solution, the clamp is a hinged clamp or a split clamp.

[0020] In the above technical solution, the clamp includes: two clamp bodies and a shaft pin. The length direction of the shaft pin is the same as the axial direction of the output shaft. The shaft pin is fixed on the outer shell of the main shaft head body. The two clamp bodies are hinged by the shaft pin to form an openable and closable clamping structure. Each clamp body has an anti-slip protrusion on the side near the output shaft.

[0021] In the above technical solution, each clamp body is semi-circular.

[0022] In the above technical solution, the locking component includes: an elliptical cam, a support plate, and a wedge-shaped positioning seat. A wedge-shaped block is formed on the locking end of each clamp body near the tool holder. The support plate is fixed to the outer shell of the spindle head body. The wedge-shaped positioning seat is fitted onto the support plate and can slide on it. Two recessed wedge-shaped grooves are formed on the wedge-shaped positioning seat. The shape of the wedge-shaped grooves is adapted to the wedge-shaped blocks. After the two clamp bodies are engaged and the clamps are locked, each wedge-shaped groove is opposite to a wedge-shaped block. The elliptical cam is rotatably connected to the support plate by bolts. By rotating the elliptical cam, when the length direction of the maximum working radius of the elliptical cam is the same as the axial direction of the output shaft, the wedge-shaped positioning seat can move towards the clamp, and each wedge-shaped block enters the corresponding wedge-shaped groove, thereby realizing the locking of the clamp.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The tool holder of the friction plug welding spindle head of this invention can reliably transmit torque and axial force during the friction plug welding process, ensuring stable movement of the plug rod. Simultaneously, after the friction plug welding is completed, the plug rod can be quickly separated from the tool holder, allowing the welding equipment with the spindle head body installed to promptly leave the welding area. This significantly improves post-weld working space conditions, freeing the processing of the plug rod on the plug hole from limitations imposed by the welding equipment and internal space. Users have sufficient space to cut the plug rod on the plug hole, reducing the risk of weld joint damage and welding failure. This invention simplifies the post-weld disassembly process, improves operational efficiency, and reduces adverse effects on the weld joint while ensuring the quality of the friction plug welding. It provides reliable technical support for the engineering application of friction plug welding technology in large structures such as rocket propellant tanks.

[0025] With the assistance of the clamping structure, the output shaft can be fixed, thereby enabling quick replacement of the cutting tool and stopper.

[0026] 2. The tool holder of this invention has a compact structure and is easy to operate. Through the reasonable structural cooperation between the tool holder body, the split fastening sleeve and the lock nut, high-precision positioning, reliable clamping and quick disassembly of the tool and the stopper are achieved, which can meet the needs of quick interchange of tool and stopper during CNC cutting defect removal and friction plug repair welding.

[0027] 3. The present invention incorporates a compression spring in the tool holder body, which, combined with a split fastening sleeve and a locking nut, ensures that the loading and unloading process of the tool holder, stopper bar, and cutting tool is both reliable and efficient, significantly improving work efficiency. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the knife handle of the present invention;

[0029] Figure 2 This is a schematic diagram of the split-type fastening sleeve of the present invention;

[0030] Figure 3 This is a schematic diagram of the assembly of the tool holder body and the split fastening sleeve of the present invention;

[0031] Figure 4 This is a cross-sectional view of the tool holder of the present invention;

[0032] Figure 5 This is a side view of the fastener of the present invention;

[0033] Figure 6 This is a three-dimensional structural diagram of the lock nut of the present invention;

[0034] Figure 7 This is a cross-sectional view of the lock nut of the present invention;

[0035] Figure 8 This is a schematic diagram of the structure of the knife handle body of the present invention;

[0036] Figure 9 Schematic diagram of welding the end of the spindle head to repair the friction plug;

[0037] Figure 10 This is a sectional view of the spindle head body.

[0038] Wherein, 1: tool holder, 1-1: tool holder body, 1-1-1: external thread, 1-2: lock nut, 1-2-1: mounting hole, 1-3: split fastening sleeve, 1-3-1: fastener, 1-3-1-1: internal thread, 1-3-1-2: smooth section, 1-4: spring washer, 1-5: shock-absorbing washer, 1-6: flange;

[0039] 2-1: Mandrel, 2-2: Piston rod, 2-3: Housing, 2-4: Annular part, 2-5: First space, 2-6: Second space, 2-7: First oil port, 2-8: Second oil port, 2-9: Bearing, 2-10: Mounting groove, 2-11: Air passage;

[0040] 3: Clamping structure; 3-1-1: Clamp body; 3-1-2: Anti-slip protrusion; 3-1-3: Wedge block; 3-2-1: Elliptical cam; 3-2-2: Support plate; 3-2-3: Wedge positioning seat. Detailed Implementation

[0041] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0042] Example 1

[0043] like Figure 9 As shown, a friction plug repair welding spindle head includes: a spindle head body, a tool holder 1 and a clamping structure 3. The spindle head body includes: an output shaft, which extends from one end of the spindle head body, and the other end of the spindle head body is fixed to an attitude control component (the attitude control component can be a robotic arm, not shown in the figure).

[0044] The output shaft can simultaneously perform axial linear reciprocating motion and rotary motion;

[0045] like Figure 1 As shown, the tool holder 1 includes: a tool holder body 1-1, a lock nut 1-2, and a split-type fastening sleeve 1-3 (the hardness of the tool holder body 1-1, lock nut 1-2, and split-type fastening sleeve 1-3 is HRC58~60), wherein:

[0046] like Figure 2 As shown, the split fastening sleeve 1-3 includes: two fasteners 1-3-1, each fastener 1-3-1 including an arc-shaped fastening part, an upper protrusion and a lower protrusion. The arc-shaped fastening part is a semi-circular arc surface. When the two fasteners 1-3-1 are engaged, the arc-shaped fastening parts of the two fasteners 1-3-1 form a ring column structure.

[0047] The upper and lower protrusions of each fastener 1-3-1 are arranged along the axial direction of the annular structure and fixed to the outer ring surface of the annular structure. Preferably, when the arc-shaped fastening portions of two fasteners 1-3-1 form an annular structure, the upper protrusions of the two fasteners 1-3-1 are in contact, and the lower protrusions of the two fasteners 1-3-1 are in contact (in this embodiment, both the upper and lower protrusions are cuboid in shape, with a width of 10-12 mm and a height of 5-6 mm, and a surface roughness Ra ≤ 10-12 mm). );

[0048] like Figure 3 , Figure 4 As shown, one end of the tool holder body 1-1 serves as the first connecting end, which is fixed to the output shaft end of the spindle head body (the first connecting end is a cylindrical structure). The other end of the tool holder body 1-1 serves as the second connecting end, which has a blind hole. The shape of the blind hole matches the outer contour of the split fastening sleeve 1-3 when the two fasteners 1-3-1 are engaged. The split fastening sleeve 1-3 after the two fasteners 1-3-1 are engaged is located within the blind hole (when the split fastening sleeve 1-3 is located in the blind hole, the two fasteners 1-3-1 are limited by the blind hole and always remain engaged). The axial length of the split fastening sleeve 1-3 matches the axial length of the blind hole. The upper and lower protrusions are used to prevent the split fastening sleeve 1-3 from rotating in the blind hole (i.e., the split fastening sleeve 1-3 cannot rotate in the blind hole). Figure 5 As shown, the annular structure formed by the arc-shaped fastening parts of the two fasteners 1-3-1 has an internal thread 1-3-1-1 inside, and the length of the internal thread 1-3-1-1 is 30-35mm; the annular structure is used to accommodate a cutting tool or a stopper rod, and is connected to the cutting tool or the stopper rod through its internal thread 1-3-1-1.

[0049] like Figure 4 As shown, a groove is formed on the bottom of the blind hole. The bottom of the groove is connected to one end of a compression spring, and the other end of the compression spring is connected to a spring washer 1-4. When the annular structure contains a cutting tool or a stopper, the compression spring and the spring washer 1-4 are pressed into the groove, and the compression spring applies a thrust toward the outside of the blind hole to the corresponding cutting tool or stopper through the spring washer 1-4.

[0050] like Figure 4 , Figure 6 as well as Figure 7 As shown, the lock nut 1-2 has a cylindrical cavity inside, one end of the lock nut 1-2 has an opening, and the other end has a mounting hole 1-2-1 (as shown). Figure 1As shown, a damping washer 1-5 is installed inside the wall of the mounting hole 1-2-1. The damping washer 1-5 is made of a material with a low coefficient of friction and damping performance, such as rubber. The damping washer 1-5 can effectively absorb the vibration generated during the removal of defects in CNC cutting of the tool or the welding process of the stopper rod friction plug. It can also prevent welding defects or equipment damage caused by vibration. The lock nut 1-2 is fitted over the second connecting end of the tool holder body 1-1 through an open opening and is threaded to the second connecting end; the shape of the mounting hole 1-2-1 is the same as the cross-sectional shape of the outer contour of the split fastening sleeve 1-3 (when the two fasteners 1-3-1 are engaged), and the shape of the mounting hole 1-2-1 is slightly larger than the cross-sectional shape of the outer contour of the split fastening sleeve 1-3. When the lock nut 1-2 is rotated until the shape of the mounting hole 1-2-1 is opposite to the cross-section of the outer contour of the split fastening sleeve 1-3, the split fastening sleeve 1-3 can pass through the mounting hole 1-2-1 of the lock nut 1-2. When the lock nut 1-2 is rotated until the shape of the mounting hole 1-2-1 is not opposite to the cross-section of the outer contour of the split fastening sleeve 1-3, the lock nut 1-2 limits the split fastening sleeve 1-3 in the blind hole.

[0051] like Figure 8 As shown, the external thread 1-1-1 of the second connecting end, which is used for threaded connection with the lock nut 1-2, is a trapezoidal thread with a length of 30-35mm, and the root of the trapezoidal thread is provided with a rounded transition structure to reduce stress concentration.

[0052] like Figure 5 As shown, the annular structure is divided into two sections along its axial direction: one section is a threaded section consisting of internal threads 1-3-1-1, and the other section is a smooth section 1-3-1-2. The diameter of the smooth section 1-3-1-2 is 32-34 mm, and the surface roughness Ra ≤ 1.6. .

[0053] The clamping structure 3 includes a clamp and a locking element. The clamp is installed on the outer shell of the spindle head body, and the locking element is used to lock the clamp. The clamp is sleeved on the outside of the output shaft. When the clamp is not locked, the clamp does not contact the output shaft and does not limit the rotation of the output shaft. When the clamp is locked, the clamp limits the rotation of the output shaft.

[0054] Example 2

[0055] A friction plug repair welding spindle head, based on Embodiment 1, such as... Figure 4 As shown, a flange 1-6 is fixedly mounted on the first connecting end of the tool holder body 1-1 for fixing to the output shaft of the spindle head body (the output shaft of the spindle head body drives the tool holder 1 to rotate and move linearly along the axis).

[0056] like Figure 9As shown, the clamp includes two clamp bodies 3-1-1 and a pin (not shown in the figure). The length direction of the pin is the same as the axial direction of the output shaft. The pin is fixed to the end face of the outer shell of the main shaft head body. The two clamp bodies 3-1-1 are hinged by the pin to form an openable and closable clamping structure. Each clamp body 3-1-1 has an anti-slip protrusion 3-1-2 on the side near the output shaft. After the clamp is locked, the anti-slip protrusion 3-1-2 presses against the output shaft and limits its rotation. Each clamp body 3-1-1 is semi-circular.

[0057] The locking components include: an elliptical cam 3-2-1, a support plate 3-2-2, and a wedge-shaped positioning seat 3-2-3. A wedge-shaped block 3-1-3 (narrowing from away from the tool holder 1 to near the tool holder 1) is formed on the locking end of each clamp body 3-1-1. The support plate 3-2-2 is fixed to the end face of the outer shell of the spindle head body. The wedge-shaped positioning seat 3-2-3 is fitted on the support plate 3-2-2 and can slide along the axial direction of the output shaft. Two recessed wedge-shaped grooves (not shown in the figure) are formed on the wedge-shaped positioning seat 3-2-3. The shape of the wedge-shaped grooves is adapted to the wedge-shaped block 3-1-3. After the two clamp bodies 3-1-1 are engaged and the clamps are locked, each wedge-shaped groove is opposite to a wedge-shaped block 3-1-3.

[0058] Elliptical cam 3-2-1 is rotatably connected to support plate 3-2-2 by bolts. Elliptical cam 3-2-1 is located on the side of wedge positioning seat 3-2-3 near the tool holder (the wedge groove is formed on the side of wedge positioning seat 3-2-3 away from the tool holder). The circumferential edge of elliptical cam 3-2-1 contacts wedge positioning seat 3-2-3. By rotating elliptical cam 3-2-1, when the length direction of the maximum working radius of elliptical cam 3-2-1 is the same as the axial direction of the output shaft, wedge positioning seat 3-2-3 can move towards the clamp, and each wedge block 3-1-3 enters the corresponding wedge groove. As the wedge block 3-1-3 enters the corresponding wedge groove, wedge positioning seat 3-2-3 tightens the locking ends of the two clamp bodies 3-1-1, thereby achieving clamp locking.

[0059] Example 3

[0060] The spindle head for friction plug repair welding includes the following steps:

[0061] Step 1: Align the two fasteners 1-3-1 so that their arc-shaped fastening parts form a ring-shaped structure. Place the split-type fastening sleeve 1-3 into the blind hole of the tool holder body 1-1. Then, tighten the locking nut 1-2 on the tool holder body 1-1. At this time, the shape of the mounting hole 1-2-1 is not opposite to the cross-section of the outer contour of the split-type fastening sleeve 1-3. The split-type fastening sleeve 1-3 is limited in the blind hole by the locking nut 1-2. Screw the tool into the ring-shaped structure and thread it with the internal thread 1-3-1-1. That is, the spindle head body installs the tool through the tool holder 1. The spindle head body enlarges the hole of the workpiece to be welded to form a plug hole through the tool.

[0062] Step 2: After forming the plug hole, use the locking device to lock the clamp to clamp the output shaft (preventing the output shaft from rotating), rotate the tool and remove the tool from the annular structure;

[0063] Step 3: Screw the stopper rod into the annular structure and connect it to the internal thread 1-3-1-1. Loosen the locking device so that it no longer locks the clamp and the clamp no longer contacts the output shaft. Use the spindle head body with the stopper rod installed to perform friction plug repair welding on the plug hole. After completing the friction plug repair welding, the end of the stopper rod away from the tool holder 1 is now plugged into the plug hole. Rotate the locking nut 1-2 until the shape of the mounting hole 1-2-1 is aligned with the cross-section of the outer contour of the split fastening sleeve 1-3. The attitude control component drives the spindle head body. Moving axially away from the plug hole, under the pushing force of the spring washer 1-4 on the plug rod, the split fastening sleeve 1-3 moves out of the blind hole along with the plug rod through the mounting hole 1-2-1. At this time, the plug rod is removed from the tool holder body 1-1, and the two fasteners 1-3-1 on the plug rod are directly separated (no force is required, they can be separated directly) and removed from the plug rod. At this time, the welding equipment with the spindle head body is moved away from the plug hole where the plug rod is welded, and the user has enough space to cut the plug rod on the plug hole.

[0064] Example 4

[0065] The main spindle head body is a rotary reciprocating hydraulic cylinder. The rotary reciprocating hydraulic cylinder can be a commercially available product in the existing technology, as long as the output shaft can perform axial linear reciprocating motion and rotary motion at the same time.

[0066] In this embodiment, the structure of the rotary reciprocating hydraulic cylinder is as follows: Figure 10As shown, the rotary reciprocating cylinder includes: a spindle 2-1, a piston rod 2-2, and a housing 2-3. A cylindrical cavity is formed inside the housing 2-3. The piston rod 2-2 is located within the cylindrical cavity and is coaxially arranged with the cavity. A closed annular cylindrical space is formed between the piston rod 2-2 and the inner wall of the cylindrical cavity. An annular component 2-4 (integrated with the piston rod 2-2) is coaxially connected to the piston rod 2-2. The annular component 2-4 is located within the annular cylindrical space and divides the space into two non-communicating spaces: a first space 2-5 and a second space 2-6. 6 (both the first space 2-5 and the second space 2-6 are annular), a first oil port 2-7 is formed on the shell 2-3 corresponding to the first space 2-5, and a second oil port 2-8 is formed on the shell 2-3 corresponding to the second space 2-6; when a medium is introduced into the first oil port 2-7, the annular member 2-4 moves axially and reduces the volume of the second space 2-6, and the medium in the second space 2-6 is discharged from the second oil port 2-8; conversely, when a medium is introduced into the second oil port 2-8, the annular member 2-4 moves axially and reduces the volume of the first space 2-5, and the medium in the first space 2-5 is discharged from the first oil port 2-7. A channel with open end faces is formed inside the piston rod 2-2 (the channel axis is the same as the piston rod 2-2 axis). A cylindrical cavity is formed inside the channel. The spindle 2-1 is located inside the cylindrical cavity and is coaxially arranged with it. Two bearings 2-9 are installed between the spindle 2-1 and the inner wall of the cylindrical cavity. One end of the spindle 2-1 serves as the output shaft of the rotary reciprocating cylinder (the output shaft of the rotary reciprocating cylinder has a mounting groove 2-10 for fixing the tool holder 1) and extends out from inside the piston rod 2-2. The motor is fixed to the piston rod 2-2, and the motor output shaft is fixed to the other end of the spindle 2-1. The working principle of the rotary reciprocating cylinder is as follows: the motor output shaft drives the spindle 2-1 to rotate (the piston rod 2-2 does not rotate), thereby realizing the rotational motion of the output shaft of the rotary reciprocating cylinder. At the same time, if it is necessary for the output shaft of the rotary reciprocating cylinder to perform axial linear reciprocating motion, the medium can be alternately introduced into the first oil port 2-7 and the second oil port 2-8.

[0067] like Figure 10 As shown, an air passage 2-11 is formed on the side wall of the cylindrical cavity. This air passage is connected to an external air pump, which can deliver high-pressure gas into the air passage 2-11 to achieve internal protection and prevent metal debris from entering the piston rod 2-2 during the removal of CNC cutting defects and the welding of friction plugs.

[0068] In Example 2, the end face of the outer shell of the spindle head body corresponds to the end face of the piston rod in Example 4.

[0069] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A friction plug repair welding spindle head, characterized in that, include: The spindle head body, the tool holder (1) and the clamping structure (3) include: an output shaft, which extends from one end of the spindle head body and can simultaneously perform axial linear reciprocating motion and rotational motion; The knife handle (1) includes: a knife handle body (1-1), a lock nut (1-2), and a split-type fastening sleeve (1-3), wherein: The split-type fastening sleeve (1-3) includes two fasteners (1-3-1), each fastener (1-3-1) including an arc-shaped fastening part and a protrusion. The arc-shaped fastening part is a semi-circular arc surface. When the two fasteners (1-3-1) are engaged, the arc-shaped fastening parts of the two fasteners (1-3-1) form a ring column structure. The protrusion of each fastener (1-3-1) is arranged along the axial direction of the ring column structure and fixed on the outer ring surface of the ring column structure. One end of the tool holder body (1-1) serves as the first connecting end, which is fixed to the output shaft end of the spindle head body. The other end of the tool holder body (1-1) serves as the second connecting end, which has a blind hole. The shape of the blind hole is compatible with the outer contour of the split fastening sleeve (1-3) when the two fasteners (1-3-1) are engaged. The split fastening sleeve (1-3) after the two fasteners (1-3-1) are engaged is located in the blind hole. The axial length of the split fastening sleeve (1-3) is compatible with the axial length of the blind hole. The protrusion prevents the split fastening sleeve (1-3) from rotating in the blind hole. The lock nut (1-2) has a cylindrical cavity inside. One end of the lock nut (1-2) has an opening, and the other end has a mounting hole (1-2-1). The lock nut (1-2) fits over the second connecting end of the tool holder body (1-1) through the opening and is threadedly connected to the second connecting end. The shape of the mounting hole (1-2-1) is the same as the cross-sectional shape of the outer contour of the split fastening sleeve (1-3), and the shape of the mounting hole (1-2-1) is different from that of the split fastening sleeve (1-2-1). 3) The cross-sectional shape of the outer contour is slightly larger. When the shape of the rotating lock nut (1-2) to the mounting hole (1-2-1) is opposite to the cross-section of the outer contour of the split fastening sleeve (1-3), the split fastening sleeve (1-3) can pass through the lock nut (1-2); when the shape of the rotating lock nut (1-2) to the mounting hole (1-2-1) is not opposite to the cross-section of the outer contour of the split fastening sleeve (1-3), the lock nut (1-2) limits the split fastening sleeve (1-3) in the blind hole. The annular structure formed by the arc-shaped fastening parts of the two fasteners (1-3-1) has an internal thread (1-3-1-1) inside. The annular structure is used to accommodate a cutting tool or a stopper rod, and is connected to the cutting tool or the stopper rod through its internal thread (1-3-1-1). The clamping structure (3) includes: a clamp and a locking element. The clamp is installed on the outer shell of the spindle head body, and the locking element is used to lock the clamp. The clamp is sleeved on the output shaft. When the clamp is not locked, the clamp does not contact the output shaft. When the clamp is locked, the clamp limits the rotation of the output shaft.

2. The friction plug repair welding spindle head according to claim 1, characterized in that, The protrusions include: When the arc-shaped fastening parts of the two fasteners (1-3-1) form a ring-shaped structure, the upper protrusions of the two fasteners (1-3-1) contact each other, and the lower protrusions of the two fasteners (1-3-1) contact each other.

3. The friction plug repair welding spindle head according to claim 1, characterized in that, The annular structure is divided into two sections along its axial direction: one section is a threaded section consisting of internal threads (1-3-1-1), and the other section is a smooth section (1-3-1-2).

4. The friction plug repair welding spindle head according to claim 1, characterized in that, The external thread (1-1-1) of the second connecting end, which is used for threaded connection with the lock nut (1-2), is a trapezoidal thread.

5. The friction plug repair welding spindle head according to claim 1, characterized in that, A groove is formed on the bottom of the blind hole inside the second connecting end. The bottom of the groove is connected to one end of a compression spring, and the other end of the compression spring is connected to a spring washer (1-4).

6. The friction plug repair welding spindle head according to claim 1, characterized in that, A shock-absorbing washer (1-5) is installed inside the mounting hole (1-2-1) of the lock nut (1-2).

7. The friction plug repair welding spindle head according to claim 1, characterized in that, A flange (1-6) is fixedly mounted on the first connecting end of the tool holder body (1-1) for fixing to the output shaft of the spindle head body.

8. The friction plug repair welding spindle head according to claim 1, characterized in that, The clamps include: Two clamp bodies (3-1-1) and a shaft pin. The length direction of the shaft pin is the same as the axial direction of the output shaft. The shaft pin is fixed on the outer shell of the main shaft head body. The two clamp bodies (3-1-1) are hinged by the shaft pin to form an openable and closable clamping structure. Each clamp body (3-1-1) has an anti-slip protrusion (3-1-2) on the side near the output shaft.

9. The friction plug repair welding spindle head according to claim 8, characterized in that, Each clamp body (3-1-1) is semi-circular.

10. The friction plug repair welding spindle head according to claim 8, characterized in that, The locking components include: an elliptical cam (3-2-1), a support plate (3-2-2), and a wedge-shaped positioning seat (3-2-3). A wedge-shaped block (3-1-3) is formed on the locking end of each clamp body (3-1-1) near the tool holder (1). The support plate (3-2-2) is fixedly mounted to the outer shell of the spindle head body. The wedge-shaped positioning seat (3-2-3) is fitted onto the support plate (3-2-2) and can slide on it. Two recessed wedge-shaped grooves are formed on the wedge-shaped positioning seat (3-2-3), the shape of which corresponds to the wedge-shaped block (3-1-3). When the two clamp bodies (3-1-1) are engaged and the clamps are locked, each wedge groove is opposite to a wedge block (3-1-3). The elliptical cam (3-2-1) is rotatably connected to the support plate (3-2-2). By rotating the elliptical cam (3-2-1), when the length direction of the maximum working radius of the elliptical cam (3-2-1) is the same as the axial direction of the output shaft, the wedge positioning seat (3-2-3) can move toward the clamp, and each wedge block (3-1-3) enters the corresponding wedge groove, thereby achieving the locking of the clamp.

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