A radial drilling machine for processing expansion joint compensators

Abstract

The present application relates to the technical field of drilling machine, specifically to a radial drilling machine for expansion joint compensator machining, which comprises a column radial unit capable of swinging and lifting, and a spindle box installed on the column radial unit and capable of moving along the length direction of the column radial unit, further comprising a feed shaft tube arranged on the spindle box and controlled by the spindle box to lift, the radial drilling machine is specially applicable to the expansion joint compensator with special double-layer pipe wall, and can control the automatic lowering of the feed stopper to the position during drilling processing, thereby playing the feed limiting role and avoiding the damage of the second layer pipe wall caused by excessive feed due to inertia and visual reasons after the first layer pipe wall is drilled through.

Description

Technical Field

[0001] This invention relates to the field of radial drilling machine technology, specifically to a radial drilling machine suitable for drilling and machining special double-walled expansion joint compensators. Background Technology

[0002] Expansion joint compensators are flexible elastic elements installed on pipelines and pressure vessels to accommodate radial or axial deformation of the pipeline. They are typically connected to the pipeline via flanges at both ends. In urban heating steam pipes and chemical high-pressure pipelines, double-walled expansion joint compensators are used. These have an inner and outer corrugated pipe section with a cavity between them. Their function is twofold: firstly, the double-walled structure improves sealing safety; secondly, pressure monitoring sensors can be installed in the cavity between the two pipe walls. This allows for pressure monitoring in case of leakage in the second pipe wall, as the pressure in the cavity changes accordingly.

[0003] When machining expansion joint compensators with special double-walled pipes, due to the need for sensor installation, holes need to be drilled in the first layer of the pipe wall to insert and seal the sensors. In existing technology, radial drilling machines are commonly used for drilling. However, during drilling, after penetrating the first layer of the pipe wall, due to operational inertia and the inability of workers to clearly observe the process, if the cutting blade continues to overfeed a short distance, it will cause the cutting blade to come into contact with the second layer of the pipe wall, resulting in damage and product defects. Drilling machines typically have a built-in feed distance limiting function, which can limit the downward movement of the cutting blade and control the machining depth through mechanical limits. However, in actual use, it has been found that this function can only limit the downward movement of the cutting blade, not the actual drilling depth. This causes inconvenience, as if the workpiece height changes (e.g., due to part or model changes), the settings need to be recalculated and adjusted. In practice, workers are often reluctant to use this method, affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a radial drilling machine for machining expansion joint compensators. In view of the problem that the second layer of pipe wall is easily damaged during drilling of expansion joint compensators with double pipe walls, a solution is proposed to limit the drilling depth of the cutting blade.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a radial drilling machine for machining expansion joint compensators, comprising: a column radial arm unit capable of swinging and lifting; a spindle box mounted on the column radial arm unit and capable of moving along the length of the column radial arm unit; further comprising: a feed spindle tube disposed on the spindle box, the spindle box controlling the lifting and lowering of the feed spindle tube; and a cutting insert depth machining axis disposed inside the feed spindle tube, the spindle box controlling the rotation of the cutting insert depth machining axis, and the cutting insert depth machining axis synchronously lifting and lowering with the feed spindle tube. The outer chamber structure is fixedly installed outside the feed shaft tube; the annular component is coaxially sleeved outside the feed shaft tube, and a lifting assembly for controlling the lifting and lowering movement of the annular component is installed inside the annular component; the limiting bracket is detachably and fixedly installed with the annular component; the feed stop is fixedly installed on the limiting bracket. When the cutting tool depth machining shaft rotates to perform drilling, the lifting assembly controls the annular component to move downward, which in turn drives the feed stop to move downward, so that the distance from the lower surface of the feed stop to the bottom end of the cutting tool is greater than the drilling depth and less than the spacing between the double-layer pipe walls of the expansion joint compensator.

[0006] The lifting assembly includes a vertical shaft fixedly installed outside the feed shaft tube, the vertical shaft being parallel to the axis of the feed shaft tube; an inner fold is fixedly installed on the upper part of the annular part, the vertical shaft passes through the inner fold, and an elastic element is installed below the inner fold, the elastic element applying an upward thrust to the inner fold.

[0007] The surface of the feed shaft tube is provided with a side clamping groove, and a clamping block is provided in the side clamping groove. The surface of the cutting tool depth machining shaft is provided with an outer wall thread.

[0008] The clamping block is fixedly provided with a meshing thread, and the annular part is fixedly provided with a driving component. The driving component controls the clamping block to move radially along the cutting tool depth machining axis. When the clamping block moves toward the cutting tool depth machining axis, the meshing thread will mesh with the outer wall thread, so that when the cutting tool depth machining axis rotates, it drives the clamping block to move downward, and the clamping block drives the annular part to move downward.

[0009] Compared with the prior art, the beneficial effects of the present invention are: This invention, a radial drilling machine, is specifically designed for expansion joint compensators in special double-walled pipes. During drilling, it automatically lowers the feed stop to its designated position, acting as a feed limiter to prevent overfeeding and damage to the second layer of pipe wall due to inertia or lack of visual inspection after drilling through the first layer. Furthermore, after drilling, the feed stop automatically moves back up to its original position, facilitating cleaning and replacement of the cutting blades. Regardless of changes in workpiece height, it consistently limits the drilling depth of the cutting blades. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0011] Figure 2 This is a schematic diagram of the double-layer structure of the expansion joint compensator.

[0012] Figure 3 This is a front view of the annular component of the present invention.

[0013] Figure 4 for Figure 3 Cross-sectional view at point AA.

[0014] Figure 5 This is a cross-sectional view of the outer warehouse structure of the present invention.

[0015] Figure 6 This is a cross-sectional view of the air blowing adjustment ring of the present invention.

[0016] Figure 7 This is a schematic diagram showing the orientation of the marking position in this invention.

[0017] Figure 8 This is a three-dimensional half-sectional view of the annular part of the present invention.

[0018] Figure 9 This is a three-dimensional half-sectional view of the outer compartment structure of the present invention.

[0019] Figure 10 This is a three-dimensional half-section view of the air blowing adjustment ring of the present invention.

[0020] Figure 11 This is a three-dimensional half-section view of the rotating ring of the present invention at a horizontal angle.

[0021] Figure 12 This is a schematic diagram of the centrifugal blade structure of the present invention.

[0022] In the diagram: 1. Column rocker arm unit; 2. Spindle box; 3. Feed shaft tube; 4. Cutting tool depth machining shaft; 5. Outer chamber structure; 6. Ring component; 7. Air blowing adjustment ring; 8. Limit bracket; 9. Feed stop component; 501. Rotating ring; 502. Side wall groove; 503. Gear shaft; 504. Transmission gear; 505. External gear ring; 506. Ring assembly; 507. Centrifugal blade; 508. Upper ring cover; 509. Air outlet; 601. Telescopic connecting curtain; 602. Air passage cavity; 701. Air blowing groove; 702. Orientation indicator; 301. Vertical shaft; 302. Inner fold; 303. Elastic component; 304. Side clamping groove; 305. Clamping block; 306. Outer wall thread; 307. Engaging thread; 308. Motor unit; 309. Lead screw; 201. Dial wheel; 310. First bearing; 311. Sealing ring; 312. Second bearing; 401. Empty section; 402. Blade holder; 403. Cutting blade; 510. Air inlet; 801. Mounting insert. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1 to 12 This invention provides a technical solution: a radial drilling machine for machining expansion joint compensators. This drilling machine is specifically designed for expansion joint compensators with special double-layer pipe walls. Its purpose is to avoid contact with the second layer of pipe wall after drilling through the first layer during the drilling process of expansion joint compensators with special double-layer pipe walls, while also being unaffected by changes in workpiece height. Specific embodiments are as follows: Please see Figure 1 It includes: a column rocker arm unit 1 capable of swinging and lifting, and a spindle box 2 mounted on the column rocker arm unit 1 and capable of moving along the length of the column rocker arm unit 1. The column rocker arm unit 1 and the spindle box 2 will not be described in detail in this invention.

[0025] Please see Figure 4 It also includes: feed spindle tube 3, cutting insert depth machining spindle 4, outer chamber structure 5 and ring part 6.

[0026] The feed spindle tube 3 is a tubular structure, mounted on the spindle box 2, which controls its lifting and lowering movement. The cutting insert depth machining axis 4 is located inside the feed spindle tube 3, and the spindle box 2 controls its rotation. The cutting insert depth machining axis 4 also moves synchronously with the feed spindle tube 3. A tool holder 402 is fixedly mounted at the lower end of the cutting insert depth machining axis 4. The tool holder 402 is a component in the prior art, and its detailed structure will not be described in detail here. A cutting insert 403 is mounted on the tool holder 402, in conjunction with reference to... Figure 8 As shown, drilling is performed using cutting blade 403.

[0027] Please see Figure 1 As shown, a dial 201 is installed on the spindle box 2. The operator can control the raising and lowering of the feed spindle tube 3 and the cutting tool depth machining axis 4 by manually rotating the dial 201, thereby controlling the feed during the drilling process. This is a common existing technology and will not be described in detail in this invention.

[0028] Please see Figure 10 A second bearing 312 is provided between the feed spindle tube 3 and the cutting insert depth machining shaft 4. The cutting insert depth machining shaft 4 is radially limited by the second bearing 312, making the drilling operation of the cutting insert depth machining shaft 4 more stable.

[0029] The outer chamber structure 5 is fixedly installed on the outside of the feed shaft tube 3 by welding, and the power take-off air blowing assembly is installed inside the outer chamber structure 5. The annular part 6 is a short tubular structure. The inner diameter of the annular part 6 is 0.5-1mm larger than the diameter of the blade clamp 402. The annular part 6 is coaxially sleeved on the outside of the feed shaft tube 3. The annular part 6 is equipped with a lifting component for controlling the lifting and moving of the annular part 6.

[0030] like Figure 4 and Figure 7 As shown, an installation sleeve 801 is welded to the outside of the annular part 6. A limiting bracket 8 is inserted into the installation sleeve 801. The limiting bracket 8 and the installation sleeve 801 are fixed by a pin, thereby keeping the limiting bracket 8 fixed to the annular part 6. When the pin is pulled out, the limiting bracket 8 can be disassembled.

[0031] A feed stop 9 is welded and fixed to the bottom of the limiting bracket 8. In this embodiment of the invention, the feed stop 9 is annular and coaxially sleeved on the outside of the cutting blade 403.

[0032] When the cutting blade depth machining axis 4 rotates to perform drilling, the lifting assembly controls the ring 6 to move downward, which in turn moves the feed stop 9 downward, so that the distance from the lower surface of the feed stop 9 to the bottom of the cutting blade 403 is greater than the drilling depth and less than the spacing between the double-layer pipe walls of the expansion joint compensator.

[0033] An air blowing adjustment ring 7 is installed at the lower part of the annular part 6. The surface of the air blowing adjustment ring 7 is provided with anti-slip vertical ridges, so that the staff can manually rotate the air blowing adjustment ring 7.

[0034] When the cutting insert depth machining axis 4 rotates to perform drilling, the annular part 6 moves down to cover the insert clamp 402, and the power take-off air blowing assembly generates positive pressure gas, which is input into the annular part 6 and ejected through the air blowing regulating ring 7.

[0035] See Figure 11 The power take-off air blowing assembly includes a rotating ring 501 and a side wall groove 502. The rotating ring 501 is formed on the cutting tool depth machining shaft 4, and the side wall groove 502 is formed in the side wall of the feed shaft tube 3. A rotating component is fixedly arranged in the side wall groove 502.

[0036] See Figure 5 and Figure 9 The feed shaft tube 3 is fitted with a ring assembly 506, and a rotating component 2 is provided on the ring assembly 506. The feed shaft tube 3 and the ring assembly 506 can rotate relative to each other through the rotating component 1 and the rotating component 2.

[0037] In this embodiment, the rotating component is preferably a gear shaft 503 fixed on the side wall groove 502, and a transmission gear 504 capable of rotating around the gear shaft 503 is provided on the outside of the gear shaft 503.

[0038] The rotating component is preferably configured as an external gear ring 505 fixedly disposed on the inner surface of the ring assembly 506, and the external gear ring 505 meshes with the transmission gear 504.

[0039] The rotating ring 501 is preferably configured as a toothed ring structure with teeth on its inner surface, and the transmission gear 504 meshes with the rotating ring 501.

[0040] In this embodiment, two sets of the aforementioned transmission gears 504 and gear shafts 503 are provided, which are symmetrically meshed on both sides of the rotating ring 501 and also mesh with the outer gear ring 505.

[0041] Centrifugal blades 507 are fixedly installed on the ring assembly 506. Several sets of centrifugal blades 507 are arranged in a circumferential array and are evenly distributed. The centrifugal blades 507 extend straight outward along the radius of the ring assembly 506. The generatrix of the centrifugal blades 507 is perpendicular to the annular cavity of the outer chamber structure 5 and is a radial straight blade. The radial straight blade has a higher wind pressure than the backward curved blade at the same size and rotation speed, thereby increasing the generated wind pressure.

[0042] An upper ring cover 508 is fixedly installed on the inner wall surface of the outer chamber structure 5. The upper ring cover 508 covers the centrifugal blades 507, so that when the centrifugal blades 507 rotate, they drive the airflow through centrifugal force; please refer to Figure 9 Two sets of first bearings 310 are provided between the ring assembly 506 and the feed shaft tube 3. The ring assembly 506 rotates relative to the feed shaft tube 3 through the first bearings 310 to reduce the friction between the two. A sealing ring 311 is also provided between the feed shaft tube 3 and the ring assembly 506. The sealing ring 311 is made of wear-resistant rubber. The sealing ring 311 seals the feed shaft tube 3 and the ring assembly 506 to prevent pressure leakage.

[0043] The lower part of the outer compartment structure 5 is provided with an air vent 509 for air venting.

[0044] Please see Figure 9 The top of the outer compartment structure 5 is provided with an air inlet window 510. A filter membrane is installed in the air inlet window 510 to filter the gas passing through the air inlet window 510. The filter membrane pore size can be set according to actual needs.

[0045] The annular component 6 has an internal air passage 602, and a telescopic connecting curtain 601 is provided between the annular component 6 and the outer compartment structure 5. (See reference) Figure 9As shown, the telescopic connecting curtain 601 is composed of two nested corrugated tubular structures, with gas flowing between the two corrugated tubular structures. To prevent the telescopic connecting curtain 601 from collapsing or bulging due to air pressure, a metal ring is provided in the telescopic connecting curtain 601 for support. The support of the metal ring prevents the telescopic connecting curtain 601 from undergoing radial deformation without affecting its axial expansion and contraction.

[0046] The air outlet 509 is connected to the air passage 602 through the telescopic connecting curtain 601.

[0047] The air blowing adjustment ring 7 can rotate relative to the ring part 6. An air blowing groove 701 is provided in the air blowing adjustment ring 7. The air passage cavity 602 is connected to the air blowing groove 701. The gas output from the air outlet 509 passes through the air passage cavity 602 and is blown out through the air blowing groove 701. The air blowing direction of the air blowing groove 701 can be adjusted by rotating the air blowing adjustment ring 7. The outer surface of the air blowing adjustment ring 7 is provided with an orientation mark 702. The orientation mark 702 can be a label, and its color is distinguished from the color of the air blowing adjustment ring 7. The air blowing direction of the air blowing channel 701 is determined by the orientation mark 702, so that the air blowing channel 701 blows air towards the side where no one is.

[0048] See Figure 5 As shown, the lifting assembly includes a vertical shaft 301 fixedly disposed outside the feed shaft tube 3, the vertical shaft 301 being parallel to the axis of the feed shaft tube 3; an inner fold 302 is fixedly disposed on the upper part of the annular part 6, the vertical shaft 301 passing through the inner fold 302, and an elastic member 303 is disposed below the inner fold 302, the elastic member 303 applying an upward thrust to the inner fold 302. The above structure completes the limiting of the annular part 6 and gives the annular part 6 an elastic tendency to move upward.

[0049] A side clamping groove 304 is provided through the surface of the feed shaft tube 3, and a clamping block 305 is provided in the side clamping groove 304. An outer wall thread 306 is provided on the surface of the cutting tool depth machining shaft 4. The clamping block 305 can be limited by the side clamping groove 304.

[0050] A meshing thread 307 is fixedly provided on the clamping block 305, and a driving component is fixedly provided on the annular component 6. The driving component controls the clamping block 305 to move radially along the cutting tool depth machining axis 4. When the clamping block 305 moves towards the cutting tool depth machining axis 4, the meshing thread 307 will mesh with the outer wall thread 306, so that when the cutting tool depth machining axis 4 rotates, it drives the clamping block 305 to move downward, and the clamping block 305 drives the annular component 6 to move downward. Please refer to [link to relevant documentation]. Figure 6 A gap section 401 is provided on the surface of the cutting insert deep machining shaft 4, and the gap section 401 is located below the outer wall thread 306.

[0051] The driving component in this application can be implemented in the following ways: Example 1: The driving component uses a motor unit 308 and a lead screw 309. The motor unit 308 is fixedly mounted on the annular part 6, and the lead screw 309 is mounted on the motor unit 308. The lead screw 309 is screwed with the clamping block 305. The motor unit 308 controls the forward and reverse rotation of the lead screw 309, so that the clamping block 305 can move back and forth radially along the cutting tool depth machining axis 4.

[0052] Example 2: The driving component uses a small hydraulic cylinder, which is fixedly mounted on the ring 6. The telescopic shaft of the small hydraulic cylinder is directly fixed to the clamping block 305. The small hydraulic cylinder controls the clamping block 305 to move radially back and forth along the cutting tool depth machining axis 4.

[0053] Example 3: The driving component uses a small cylinder, which is fixedly mounted on the ring 6. The telescopic shaft of the small cylinder is directly fixed to the clamping block 305. The small cylinder controls the clamping block 305 to move radially back and forth along the cutting tool depth machining axis 4.

[0054] For details regarding the lifting control of the annular component 6 in this invention, please refer to [link / reference needed]. Figure 9 As shown, when the cutting tool depth machining shaft 4 starts rotating to perform drilling, taking the first embodiment as an example, the motor unit 308 is simultaneously controlled, causing the lead screw 309 to rotate and drive the clamping block 305 to move towards the cutting tool depth machining shaft 4. After the meshing thread 307 contacts the outer wall thread 306, they engage. The rotation of the outer wall thread 306 drives the meshing thread 307, the motor unit 308, and the ring part 6 to move downwards. It is worth noting that when the cutting tool depth machining shaft 4 is working, the speed is gradually increased from low speed to the working speed. In order to reduce or avoid the rigid impact when the meshing thread 307 contacts the outer wall thread 306, the meshing thread 307 is controlled to contact the outer wall thread 306 as soon as the cutting tool depth machining shaft 4 starts, so as to avoid the meshing thread 307 engaging with the outer wall thread 306 only after the cutting tool depth machining shaft 4 has accelerated to a higher working speed.

[0055] The specific principle of the engagement between the meshing thread 307 and the outer wall thread 306 is that the threaded sleeve and the lead screw cooperate. At this time, the outer wall thread 306 is equivalent to the lead screw, while the meshing thread 307 and the clamping block 305 are one-sixth to one-tenth of the threaded sleeve structure. Through the rigid limit of the structure, after the two come into contact and mesh, the effect of the threaded sleeve and the lead screw cooperating is produced.

[0056] At this time, the elastic element 303 is in a state of gradual compression and force accumulation; in conjunction with reference Figure 10When the engaging thread 307 moves down to the empty section 401, it stops moving downwards. The outer wall thread 306 blocks the movement, keeping the annular part 6 in its final position. The downward stroke of the annular part 6 is controlled by adjusting the stroke length of the outer wall thread 306, ensuring that the annular part 6 at least covers the blade clamp 402 when it reaches its final position, reducing the potential hazards caused by the blade clamp 402. Furthermore, the distance from the lower surface of the feed stop 9 to the bottom of the cutting blade 403 is greater than the drilling depth but less than the spacing between the two layers of pipe walls in the expansion joint compensator. Thus, during drilling, if the cutting blade 403 continues to move downwards excessively due to inertia after the first layer of pipe wall has been drilled through, the lower surface of the feed stop 9 will collide with the first layer of pipe wall, providing a limit warning.

[0057] After the cutting insert depth machining axis 4 completes the drilling and stops rotating, the control block 305 moves away from the cutting insert depth machining axis 4. When the meshing thread 307 separates from the outer wall thread 306, the ring 6 will quickly move upward into place under the elastic support of the elastic element 303, so that the insert clamp 402 is exposed again. This is to meet the need for frequent replacement of the cutting insert 403 when the diameter of the hole to be machined is different during the machining of the expansion joint compensator. Through the automatic upward movement of the ring 6, the operator can directly rotate the insert clamp 402 to remove the cutting insert 403 and complete the replacement without any sensory input.

[0058] The lifting assembly can drive the ring part 6 by means of the rotation of the cutting blade deep machining axis 4, thereby amplifying the driving stroke and driving force. Only the motor unit 308 needs to move the clamping block 305 by a small stroke to complete the large lifting and lowering adjustment of the ring part 6 in conjunction with the cutting blade deep machining axis 4.

[0059] Please refer to the power take-off air blowing assembly of the present invention. Figure 11 As shown, when the cutting insert deep machining shaft 4 rotates, the cutting insert deep machining shaft 4 drives the transmission gear 504 to rotate through the rotating ring 501. The transmission gear 504 then drives the external gear ring 505, causing the ring assembly 506 and the centrifugal blade 507 to rotate. Furthermore, the higher the rotational speed of the cutting insert deep machining shaft 4, the higher the rotational speed of the centrifugal blade 507 will be due to the structural correlation.

[0060] When the centrifugal blades 507 rotate, the centrifugal force causes the airflow at the center of the centrifugal blades 507 to flow in all directions. The airflow path is as follows: it is drawn in through the air inlet window 510, flows outward from the center of the centrifugal blades 507 arranged in a circular array, and is discharged into the telescopic connecting curtain 601 through the air outlet 509.

[0061] See Figure 10As shown, the air is blown out obliquely downward through the air blowing channel 701 after passing through the air passage 602. When the annular part 6 moves down into place, the air blowing direction of the air blowing channel 701 is 1-3cm above the lower end of the cutting blade 403, so that the dust and debris in the drilling process can be blown away in time.

[0062] Please also refer to Figure 7 and Figure 10 As shown, Figure 7 In this design, an orientation mark 702 is provided on the surface of the air blowing adjustment ring 7. The orientation mark 702 indicates the position of the air blowing groove 701. When drilling, the operator only needs to rotate the air blowing adjustment ring 7 so that the orientation mark 702 faces them. At this time, the air blowing groove 701 will blow air towards the unattended side. The air blowing adjustment ring 7 has rotational damping, and the damping is greater than the vibration effect during drilling, thus ensuring that the working vibration will not affect the position change of the air blowing adjustment ring 7.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A radial drilling machine for machining expansion joint compensators, comprising: A column rocker arm unit capable of swinging and lifting, and a spindle box mounted on the column rocker arm unit and movable along the length of the column rocker arm unit, characterized in that it further includes: The feed spindle tube is mounted on the spindle box, and the spindle box controls the raising and lowering of the feed spindle tube. The cutting insert depth machining axis is located inside the feed spindle tube. The spindle box controls the rotation of the cutting insert depth machining axis, and the cutting insert depth machining axis moves up and down synchronously with the feed spindle tube. The outer chamber structure is fixedly installed outside the feed shaft tube; The annular component is coaxially sleeved on the outside of the feed shaft tube, and a lifting assembly for controlling the lifting and moving of the annular component is provided inside the annular component. The limiting bracket is detachably and fixedly installed with the ring-shaped component; The feed stop is fixedly installed on the limit bracket. When the cutting tool depth machining axis rotates to perform drilling, the lifting component controls the ring to move down, which in turn drives the feed stop to move down.

2. The radial drilling machine for machining expansion joint compensators according to claim 1, characterized in that: The lifting assembly includes a vertical shaft fixedly installed outside the feed shaft tube, and the vertical shaft is parallel to the axis of the feed shaft tube.

3. A radial drilling machine for machining expansion joint compensators according to claim 2, characterized in that: An inner folded eave is fixedly provided on the upper part of the annular component. The vertical shaft passes through the inner folded eave. An elastic component is provided below the inner folded eave, and the elastic component applies an upward thrust to the inner folded eave.

4. A radial drilling machine for machining expansion joint compensators according to claim 3, characterized in that: The surface of the feed shaft tube is provided with a side clamping groove, and a clamping block is provided in the side clamping groove. The surface of the cutting tool depth machining shaft is provided with an outer wall thread.

5. A radial drilling machine for machining expansion joint compensators according to claim 4, characterized in that: The clamping block is fixedly provided with a meshing thread, and the annular part is fixedly provided with a driving component. The driving component controls the clamping block to move radially along the depth machining axis of the cutting blade.

6. A radial drilling machine for machining expansion joint compensators according to claim 5, characterized in that: When the clamping block moves toward the cutting tool's depth machining axis, the meshing thread will engage with the outer wall thread, causing the cutting tool's depth machining axis to rotate and drive the clamping block to move downwards, which in turn drives the ring component to move downwards.

7. A radial drilling machine for machining expansion joint compensators according to claim 1, characterized in that: The annular component is provided with an installation sleeve on its exterior, and the limiting bracket is detachably fixed to the annular component through the installation sleeve.

8. A radial drilling machine for machining expansion joint compensators according to claim 1, characterized in that: The feed stop is annular and coaxially sleeved on the outside of the cutting insert.

9. A radial drilling machine for machining expansion joint compensators according to claim 1, characterized in that: After the feed stop moves down to its position, the distance from the lower surface of the feed stop to the bottom of the cutting blade is greater than the drilling depth and less than the spacing between the double-layer pipe walls of the expansion joint compensator.

10. A radial drilling machine for machining expansion joint compensators according to claim 1, characterized in that: After drilling is completed, the lifting assembly controls the feed stop to move upward.

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