Device and method for boring inner surface of inner sleeve of polyformaldehyde crystallizer

Abstract

The invention provides a device and a method for boring the inner surface of an inner sleeve of a polyformaldehyde crystallizer. The device and the method are used for solving the problem that the inner wall of a slender inner sleeve (L / Dgt; 25) is easy to deform and flutter during repair processing. The device comprises a boring feeding pulley, a transmission guide rod, a head rack, an inner supporting mechanism, a boring mechanism, a core fixing steel cable, a pipe seat and a tail rack, one end of the inner sleeve is externally clamped by the tube seat, and the other end is internally supported by the inner supporting mechanism; the boring mechanism is driven by the transmission guide rod to penetrate into the inner sleeve to conduct rotary boring, and meanwhile the boring mechanism is radially restrained by a fixed core steel cable penetrating through an inner sleeve cavity so as to restrain vibration. One end is externally clamped by the chuck, and the other end is internally supported by the elastic support, so that external clamping and internal supporting two-point fixation is formed; the steel wire rope penetrates through the inner sleeve to hold the boring head for centering, stable and high-precision boring of the thin and long thin-wall sleeve is achieved, the smoothness and the machining efficiency of the repaired inner wall are effectively improved, and the device is particularly suitable for repairing operation of the inner sleeve of the polyformaldehyde crystallizer.

Description

Technical Field

[0001] This invention relates to crystallizers in the field of polyoxymethylene (POM), and particularly to a device and method for boring the inner surface of the inner sleeve of a POM crystallizer. Background Technology

[0002] Polyoxymethylene (POM), also known as polyacetal or acetal resin, with the chemical formula CH2O and CAS number 9002-81-7, is a thermoplastic crystalline polymer. It appears as a colorless solid with a density of 1.42 g / mL. The melting point of the homopolymer is approximately 180℃, while that of the copolymer is 162–173℃, and its crystallinity exceeds 70%. Refined formaldehyde reacts with sulfuric acid as a catalyst at 60–70℃ to produce trioxymethylene (TOX). The reaction solution enters a tubular crystallizer and is cooled to 20–30℃, causing TOX to crystallize out. The crystals are then obtained by centrifugation.

[0003] The easily damaged accessory of the polyoxymethylene (POM) sleeve crystallizer is the sleeve itself. Referring to the "Scraper Sleeve Crystallizer" published in Chinese Patent Publication No. CN101380524A, the sleeve includes an inner sleeve and an outer sleeve. During production, the inner sleeve experiences long-term wear and tear from the reaction liquid, resulting in scratches, grooves, and defects on its inner wall. This directly affects the transport of the reaction liquid and the crystallization rate. The uneven inner wall of the inner sleeve causes continuous friction from the reaction liquid, creating a wear-prone, rough surface. This unevenness increases the resistance of the reaction liquid, leading to decreased flow rate, increased energy consumption, and reduced transport efficiency. Therefore, it is necessary to weld the damaged and defective parts of the inner sleeve and then machine the welded areas to improve surface finish.

[0004] The inner sleeve of the polyoxymethylene sleeve crystallizer has a specification of φ325X8 and a length of 8283mm. The ratio of length L to diameter D is greater than 25. Since rods with an L / D ratio greater than 25 are slender rods, the inner sleeve is a typical slender rod.

[0005] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: When traditional boring methods are applied to the inner sleeve of a polyoxymethylene (POM) sleeve crystallizer, the following technical challenges remain: 1. The inner sleeve of the polyoxymethylene sleeve crystallizer is difficult to clamp and is very prone to bending and deformation due to clamping force and its own weight; 2. During the cutting process, slender rods are prone to machining deformation and cutting chatter, resulting in poor machining accuracy, high surface roughness, and even the inability to achieve effective cutting; 3. Low processing efficiency and poor stability.

[0006] If the inner wall of the polyoxymethylene (POM) sleeve crystallizer has any remaining unevenness, it will not only increase fluid resistance, reduce flow rate and increase energy consumption, but the "gaps and pits" formed by its rough surface may also leave residual media, which will react slowly with POM, accelerate the aging of the tube wall and may cause flow channel blockage. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies and address the problems of clamping deformation, cutting chatter, and difficulty in ensuring machining accuracy during the boring of the inner wall of the polyoxymethylene (POM) crystallizer inner sleeve, this application provides a boring device and method for the inner surface of the POM crystallizer inner sleeve. This method uses a boring feed trolley connected to a multi-stage transmission rod to insert the boring mechanism into the POM crystallizer inner sleeve, allowing for long-distance axial feeding along a centering cable to bore the welded area, thus solving the technical problems of boring the inner wall of the POM crystallizer inner sleeve.

[0008] The solution adopted by the embodiments of this application to solve the technical problem is: A boring device for the inner surface of the inner sleeve of a polyoxymethylene crystallizer includes a boring feed trolley, a transmission guide rod, a head frame, an inner support mechanism, a boring mechanism, a centering steel cable, a tube seat, and a tail frame; The transmission guide rod includes a connecting rod and a multi-stage guide rod. The multi-stage guide rod is connected to the output end of the connecting rod. The multi-stage guide rod is formed by connecting the guide rods in series. One end of the guide rod is provided with an internal thread and the other end is provided with an external thread. The internal thread and the external thread are screwed together to form a multi-stage guide rod. The number of guide rod sections is increased according to the length of the inner sleeve to transmit torque to the boring operation position of the inner sleeve. The boring feed trolley has a car body, on which a drive motor is installed, which is connected to a connecting rod via a drive shaft; a feed motor is also installed on the car body, which drives a pulley to slide on a guide rail via a trolley shaft, thereby realizing the reciprocating feed motion of the boring feed trolley and the driven drive rod along the axial direction of the inner sleeve. The first frame is set at one end of the inner sleeve. The first seat is set on the first frame. The first seat is equipped with a support sleeve. Multi-stage guide rods pass through the support sleeve and extend into the inner cavity of the inner sleeve. The inner support mechanism is connected to the support sleeve, and elastic supports are arrayed on the inner support mechanism to form the inner support points of the inner sleeve; the inner support mechanism is also arrayed with hanging ears. The boring mechanism includes a cutter head and a connecting sleeve; the cutter head is connected to the extension end of the multi-stage guide rod through the connecting sleeve and rotates with it; a cutter body is mounted on the cutter head, and an alloy cutter head is embedded at the front end of the cutter body for boring the welded part of the inner cavity of the inner sleeve; spokes are evenly distributed on the cutter head, and through holes are provided on the spokes. The centering cable includes a wire rope and a hook; hooks are fitted at both ends of the wire rope, and one end of the wire rope is connected to a lug through the hook. The wire rope passes through a through hole to radially restrain the boring mechanism. The tail frame is located at the other end of the inner sleeve. A tail seat is located at one end of the tail frame. A tail shaft is installed in the tail seat. The tail shaft is supported by bearings and rotates freely. It is concentric and collinear with the drive shaft. The tube seat is located at the other end of the tail frame and includes a chuck, a tube support seat, and a baffle. The output end of the tail shaft extends into the tube support seat and is connected to the baffle. A rope hook is provided on the baffle to connect the wire rope. A chuck is provided on the side of the tube support seat to clamp the outer circle of the end of the inner sleeve, forming an outer clamping point. The inner sleeve is clamped at one end by a chuck and supported at the other end by the elastic support of the inner support mechanism, forming a two-point fixation. The boring mechanism extends into the inner sleeve through a multi-stage guide rod and rotates to perform boring operations. The wire rope passes through the through hole of the spoke plate and is connected to the lug of the inner support mechanism by a rope hook. The other end of the wire rope is connected to the baffle of the tube seat by a rope hook. The tensioned wire rope swings with the rotation of the cutter head during the boring process, forming a dynamic radial constraint to realize the boring operation of the boring mechanism.

[0009] To further address the technical problems to be solved in the embodiments of this application, the embodiments of this application provide a method for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer, which utilizes a boring device for the inner surface of the inner sleeve of a polyoxymethylene crystallizer and includes the following steps: Step 1: According to the inner diameter of the inner sleeve, adjust the elastic support in the inner support mechanism so that its spherical guide mandrel elastically supports the inner sleeve; at the same time, adjust the self-aligning screw in the boring mechanism to adjust the radial extension of the tool body so that the tool head can bore the weld repair area. Step 2: Select the required multi-stage guide rods and adjust the length of the wire rope according to the length of the inner sleeve; Step 3: Install the tail frame at one end of the inner sleeve and clamp and fix the inner sleeve with the chuck of the tube seat; install the head frame at the other end of the inner sleeve and connect the inner support mechanism through the support sleeve. The elastic support automatically springs open to support the inner wall of the inner sleeve, so that the elastic support forms a support point at the other end of the inner sleeve; adjust the foot of the head end and the foot of the tail end to ensure that the transmission guide rod, the inner sleeve and the tail shaft are collinear. Step 4: The drive shaft of the boring feed carriage is connected to the drive guide rod. The multi-stage guide rod passes through the support sleeve and the cover of the inner support mechanism in sequence. The boring mechanism is connected to the end of the drive guide rod by the connecting sleeve. Step 5: Connect one end of the wire rope to the lug of the inner support mechanism through the rope hook, pass it through the through hole of the boring mechanism in sequence, and connect the other end to the baffle of the tube seat through the rope hook. Adjust the rope hook to tension the wire rope. Step 6: Start the drive motor to rotate the boring mechanism on the multi-stage guide rod. At the same time, start the feed motor to drive the boring feed trolley to slide towards the tail frame, driving the boring mechanism on the multi-stage guide rod to feed axially, boring the welded part or the entire inner wall of the inner sleeve. Meanwhile, by adding multi-stage guide rods to extend the axial displacement, the centering steel cable constrains the radial runout of the cutter head throughout the process, thereby realizing the boring of the inner sleeve. Step 7: After boring is completed, the feed motor reverses, the boring feed trolley retracts, and the boring mechanism exits the inner sleeve; the chuck is released, and the next inner sleeve boring operation begins.

[0010] Positive effects: 1. Clamping and support of the inner sleeve: A two-point fixing method is adopted, with one end of the tube seat external clamp and the other end of the internal support mechanism. Combined with the centering steel cable running through the entire length of the inner sleeve, the boring mechanism is radially restrained, which effectively overcomes the problems of poor rigidity and easy deformation of slender rods and provides a foundation for stable cutting.

[0011] 2. Significant vibration suppression and centering effects: The centering cable swings along with the boring mechanism as it rotates, generating a continuous radial constraint force on the cutter head, which can effectively suppress chatter generated during cutting and improve machining stability and surface finish.

[0012] 3. Flexible adjustment and good centering: The first seat adopts a split structure with adjustment components, which can accurately adjust the center of the transmission guide rod; the self-aligning screw on the cutter head can easily fine adjust the size of the cutter body; the chuck of the tube seat is adjustable, which ensures good centering of the inner sleeve, cutter, and transmission shaft system, and guarantees machining accuracy.

[0013] 4. High adaptability and efficiency: The transmission guide rod adopts a multi-stage threaded connection and the length is adjustable to adapt to inner sleeves of different lengths; the device integrates power and feed, has a high degree of automation, and the processing efficiency and quality are greatly improved compared with traditional manual or simple tooling.

[0014] 5. Highly specialized and reliable: Specifically designed for the large length-to-diameter ratio and poor rigidity of the inner sleeve of polyoxymethylene crystallizer, it solves the repair and processing problems in this specific scenario, ensures the smoothness of the inner wall after repair, and helps to extend the equipment life and improve production efficiency.

[0015] It is suitable for use as a boring device and method for the inner surface of the inner sleeve of a polyoxymethylene crystallizer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is the southeast isometric view of this embodiment; Figure 2 This is the isometric drawing of the southwest region in this embodiment; Figure 3 This is the isometric view of the northwest region in this embodiment; Figure 4 This is the northeast isometric view of this embodiment; Figure 5 This is the front view of this embodiment; Figure 6 This is a bottom view of this embodiment; Figure 7 This is an isometric view of section AA in this embodiment; Figure 8 This is an isometric view of section BB in this embodiment; Figure 9 This is an isometric view of the CC section in this embodiment; Figure 10 This is an isometric view of the DD section in this embodiment; Figure 11 This is an isometric view of the EE section in this embodiment; Figure 12 This is an isometric view of the FF section in this embodiment; Figure 13 Isometric drawing of the internal support mechanism; Figure 14 This is a sectional view of the internal support mechanism; Figure 15 Isometric drawing of the boring mechanism; Figure 16 This is a sectional view of the boring mechanism.

[0018] In the picture: 100. Boring feed pulley, 110. Vehicle body, 120. Drive motor, 121. Drive pulley for transmission. 130. Drive shaft, 131. Driven pulley in transmission, 140. Drive shaft seat, 150. Feed motor, 151. Feed drive pulley, 160. Pulley shaft, 161. Feed driven pulley, 170. Pulley; 200. Transmission guide rod, 210. Connecting rod, 220. Multi-stage guide rod; 300. First rack, 310. First seat, 311. Take your seat, 312. The seat of honor, 313. Support ring, 314. Connecting ring, 315. Connecting shaft, 316. Adjust the screw. 317. Adjusting nut, 320. First end frame, 330. Seat plate, 340. Head and foot; 400. Internal support mechanism, 410. Cover body, 411. Guide shell, 412. Tail outlet, 413. First import, 414. Connecting spokes, 420. Elastic support, 421. Spherical guide mandrel, 422. Shaft seat, 423. Lock cap, 424. Spring, 430. End cap, 440. Stud, 450. Ear loops; 500. Boring mechanism, 510. Cutter head, 511. Connector 512. Spokes, 513. Through hole, 520. Connecting sleeve, 530. Thread nut sleeve, 540. Self-aligning screw, 541. Self-aligning nut, 550. Blade body, 560. Compression cap; 600. Core-stabilizing steel cable 610. Steel wire rope, 620. Rope hook; 700. Tube seat, 710. Chuck 711. Clamp seat plate, 712. Mother silk, 713. Lead screw, 714. Lock nut 715. Clamp, 720. Pipe support base, 721. Seal the plate. 722. Set plate, 723. Cylindrical ring, 730. Baffle; 800. Tail rack, 810. Tail seat, 820. Tail shaft, 830. Tail end frame, 840. Tail end foot. Detailed Implementation

[0019] 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 a part of the embodiments of the present invention, and not all of them. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0020] This application provides a boring device and method for the inner surface of the inner sleeve of a polyoxymethylene (POM) crystallizer. This solves the problem in the prior art where the inner sleeve of a POM crystallizer is prone to damage and defects, making it impossible to improve the surface finish after welding repairs. The boring device utilizes a boring feed trolley 100, through multi-stage transmission guide rods 200, to insert the boring mechanism 500 into the inner sleeve of the POM crystallizer. The mechanism is fed axially a long distance along the centering cable 600 to bore the welded area. This eliminates the need to disassemble the inner sleeve of the POM crystallizer and allows for simultaneous cutting of two sets of inner sleeves after welding repairs, improving the surface finish of the inner wall of the POM crystallizer inner sleeve. This, in turn, improves the efficiency of the reaction liquid transport, eliminates the risk of residual media, and extends the service life of the inner sleeve.

[0021] According to the instruction manual Figure 1-16 As shown, a boring device for the inner surface of the inner sleeve of a polyoxymethylene crystallizer includes a boring feed trolley 100, a transmission guide rod 200, a first frame 300, an inner support mechanism 400, a boring mechanism 500, a centering steel cable 600, a tube seat 700, and a tail frame 800. The transmission guide rod 200 includes a connecting rod 210 and a multi-stage guide rod 220. The connecting rod 210 is the input shaft, and the multi-stage guide rod 220 is connected to the output end of the connecting rod 210. The multi-stage guide rod 220 is formed by connecting the guide rods in series and is used to transmit torque. One end of the guide rod is provided with an internal thread, and the other end is provided with an external thread. The internal thread and the external thread are screwed together to form the multi-stage guide rod 220. The number of guide rod sections is increased according to the length of the inner sleeve to extend the axial length of the transmission guide rod 200 and transmit torque to the inner sleeve boring operation position. The boring feed trolley 100 serves as the power source and feed motion source for boring. It has a carriage 110, on which a drive motor 120 is mounted. The drive motor 120 is connected to the connecting rod 210 via a drive shaft 130, outputting torque to provide power to the drive guide rod 200. A feed motor 150 is also mounted on the carriage 110, which drives a pulley 170 to slide on a guide rail via a trolley shaft 160. The guide rail is not shown in the attached drawings. This enables the boring feed trolley 100 and the driven drive guide rod 200 to reciprocate along the axial direction of the inner sleeve. The first frame 300 is set at one end of the inner sleeve to support the multi-stage guide rods 220. A first seat 310 is set on the first frame 300. A support sleeve is provided inside the first seat 310. The multi-stage guide rods 220 pass through the support sleeve and extend into the inner cavity of the inner sleeve. The inner support mechanism 400 is connected to the support sleeve. Elastic supports 420 are arrayed on the inner support mechanism 400 to contact the inner surface of the inner sleeve and form the inner support point of the inner sleeve. Lugs 450 are also arrayed on the inner support mechanism 400. The boring mechanism 500 includes a cutter head 510 and a connecting sleeve 520; the cutter head 510 is connected to the extension end of the multi-stage guide rod 220 through the connecting sleeve 520 and rotates with it; a cutter body 550 is mounted on the cutter head 510, and an alloy cutter head is embedded at the front end of the cutter body 550 for boring the inner cavity of the inner sleeve for welding repair; spokes 512 are evenly distributed on the cutter head 510, and through holes 513 are provided on the spokes 512; The core-stabilizing steel cable 600 includes a steel wire rope 610 and a rope hook 620; the steel wire rope 610 is equipped with rope hooks 620 at both ends, one end of the steel wire rope 610 is connected to the lug 450 through the rope hook 620, and the steel wire rope 610 passes through the through hole 513 to radially restrain the boring mechanism 500. The tail frame 800 is located at the other end of the inner sleeve. A tail seat 810 is provided at one end of the tail frame 800. A tail shaft 820 is assembled in the tail seat 810. The tail shaft 820 is supported by bearings and rotates freely. It is concentric and collinear with the drive shaft 130. The tube seat 700 is located at the other end of the tail frame 800 and includes a chuck 710, a tube support seat 720, and a baffle 730. The output end of the tail shaft 820 extends into the tube support seat 720 and is connected to the baffle 730. The baffle 730 has a disc structure and a rope hook 620 is provided on the baffle 730 to connect the wire rope 610 for fixing the end of the cored steel cable 600. A chuck 710 is provided on the side of the tube support seat 720 for clamping the outer circle of the end of the inner sleeve to form an outer locking point. One end of the inner sleeve is clamped externally by a chuck 710, and the other end is supported internally by the elastic support 420 of the inner support mechanism 400, forming a two-point fixation. The boring mechanism 500 extends into the inner sleeve through the multi-stage guide rod 220 and rotates to perform boring operations. The wire rope 610 passes through the through hole 513 of the spoke plate 512. The wire rope 610 is connected to the lug 450 of the inner support mechanism 400 through the rope hook 620, and the other end is connected to the baffle 730 of the tube seat 700 through the rope hook 620. The tensioned wire rope 610 swings with the rotation of the cutter head 510 during the boring process, forming a dynamic radial constraint, which effectively suppresses the vibration of the cutter head 510 and plays a role in centering and vibration reduction, thereby realizing the boring operation of the boring mechanism 500.

[0022] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the tube seat 700 is equipped with a chuck 710 on the side and the inner support mechanism 400 is equipped with an elastic support 420, one end of the inner sleeve is externally clamped by the chuck 710 and the other end is internally supported by the elastic support 420 of the inner support mechanism 400, forming a two-point fixation. This enables boring operations to be performed without disassembling the inner sleeve, thus improving work efficiency. Since the boring mechanism 500 is located at the front end of the multi-stage guide rod 220, which is formed by connecting guide rods in series and extending the axial length of the transmission guide rod 200, the boring mechanism 500 extends into the inner sleeve through the multi-stage guide rod 220 and rotates to perform boring operations. Since the wire rope 610 passes through the through hole 513 of the spoke plate 512, the wire rope 610 is connected to the lug 450 of the inner support mechanism 400 through the rope hook 620, and the other end is connected to the baffle 730 of the tube seat 700 through the rope hook 620. Therefore, the tensioned wire rope 610 rotates with the boring mechanism 500 and radially restrains the boring mechanism 500, keeping the boring mechanism 500 stable and realizing the boring operation. Because the device can perform boring operations on two sets of inner sleeves simultaneously, it improves the working efficiency of inner sleeve boring and solves the problem of damage to the inner sleeves of polyoxymethylene crystallizers.

[0023] To ensure the stability of the structure in this embodiment, the boring feed trolley 100 includes a body 110, a drive motor 120, a drive shaft 130, a drive shaft seat 140, a feed motor 150, a trolley shaft 160, and a pulley 170. The vehicle body 110 has a frame structure. A drive motor 120 is installed at the end of the vehicle body 110, and a drive pulley 121 is installed at the output end of the drive motor 120. A drive shaft seat 140 is arranged on the top of the vehicle body 110, and a drive shaft 130 is assembled between the two drive shaft seats 140. The drive shaft 130 is supported and fixed at two points by bearings. A drive pulley 131 is installed at the outer end of the drive shaft 130. The drive pulley 121 of the drive motor 120 drives the drive pulley 131 through the drive belt, thereby driving the drive shaft 130 to rotate. A feed motor 150 is provided on the side of the car body 110, and a feed drive pulley 151 is provided at the output end of the feed motor 150. At the bottom of the car body 110, there are trolley shafts 160 supported by axle seats. Each trolley shaft 160 is provided with a pulley 170, which sits on a guide rail. The outer end of one trolley shaft 160 is provided with a feed driven pulley 161. The feed drive pulley 151 of the feed motor 150 drives the feed driven pulley 161 via the feed belt, driving the pulley 170 to slide along the guide rail, so that the boring feed trolley 100 feeds along the inner sleeve axis.

[0024] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the boring feed trolley 100 is equipped with a drive motor 120 and a feed motor 150 respectively, the drive motor 120 drives the drive shaft 130 to rotate, the feed motor 150 drives the pulley 170 to slide along the guide rail, the drive shaft 130 drives the boring mechanism 500 to rotate, and at the same time the boring mechanism 500 can feed along the inner sleeve axis to carry out boring operations.

[0025] To further ensure the stability of the structure in this embodiment, the first frame 300 includes a first base 310, a first end frame 320, a base plate 330, and a first end foot 340; The first end frame 320 is a frame structure. A base plate 330 is provided on the upper part of the first end frame 320, and the first seat 310 is assembled on the base plate 330. A first end foot 340 is provided at the lower part of the first end frame 320 to adjust the center height of the first seat 310 so that the multi-stage guide rod 220 is collinear with the center of the inner sleeve.

[0026] To optimize the structure of this embodiment, the first seat 310 is a split mechanism, including a lower seat 311, an upper seat 312 and a support ring 313; The lower seat 311 is an arc-shaped plate connected to the seat plate 330; the upper seat 312 is also an arc-shaped plate, screwed to the lower seat 311 to form a clamping structure; a support ring 313 is provided between the upper seat 312 and the lower seat 311. The support ring 313 is a cylindrical structure. A support sleeve is provided inside the support ring 313 and supported and fixed by a rolling bearing. A multi-stage guide rod 220 passes through the support sleeve and is clearance-fitted with it. The multi-stage guide rod 220 slides along the support sleeve; the support ring 313 is assembled between the upper seat 312 and the lower seat 311 through the adjustment component of the circular array and the center is adjusted. By adjusting the spatial position of the support ring 313 and the support sleeve in the upper seat 312 and the lower seat 311, it is ensured that the center line of the multi-stage guide rod 220 passing through it is precisely aligned with the center line of the inner sleeve to be installed later. Preferably, the adjustment assembly includes a connecting ring 314, a connecting shaft 315, and an adjusting screw 316; The connecting ring 314 is a circular hook, and the circular array is on the outer surface of the support ring 313; The adjusting screw 316 has a Y-shaped structure with a threaded upper part. It passes through the upper seat 312 and the lower seat 311 and is connected and fixed by the adjusting nut 317. At the same time, it adjusts the position of the support ring 313 between the upper seat 312 and the lower seat 311. The connecting shaft 315 is a shaft structure that passes through the two wings at the bottom of the adjusting screw 316 and connects to the connecting ring 314, so that the support ring 313 is fixed between the upper seat 312 and the lower seat 311.

[0027] In this embodiment, the adjustment components are arranged in three groups in a circular array centered on the support sleeve.

[0028] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the support ring 313 between the upper seat 312 and the lower seat 311 is equipped with an adjustment component, the support ring 313 can be adjusted to center through the adjustment component, which facilitates the smooth rotation of the multi-stage guide rod 220.

[0029] To further optimize the structure of this embodiment, the inner support mechanism 400 includes a cover 410, an elastic support 420, an end cap 430, a stud 440, and a hanging lug 450. The end cap 430 has a disc structure. One end cap is connected to the support sleeve, and the other end cap is connected to the cover 410. The two end caps 430 are connected and fixed by studs 440, so that there is an operating space between the inner sleeve and the first frame 300. The cover 410 has a cylindrical structure, with multi-stage guide rods 220 passing through the inner cavity. There are elastic supports 420 arranged in a ring on the outer surface of the cover 410 to support the inner surface of the inner sleeve. There are lugs 450 arranged in a ring at the end of the cover 410, and the lugs 450 and the elastic supports 420 are distributed alternately. In this embodiment, the elastic supports 420 are in two sets and are arranged alternately.

[0030] Preferably, the cover 410 includes a guide shell 411, which is a horizontally placed cylindrical structure. A first inlet 413 is provided at one end of the guide shell 411, and a connecting spoke 414 is provided adjacent to the first inlet 413. The connecting spoke 414 is used to connect the end cap 430 to form an integral unit. A tail outlet 412 is provided at one end of the guide shell 411. The multi-stage guide rod 220 enters through the first inlet 413 and extends out through the tail outlet 412. Preferably, the elastic support 420 includes a spherical guide mandrel 421, a bearing seat 422, a locking cap 423, and a spring 424. Bearing seats 422 are arranged in a circular array on the outer surface of the guide housing 411. A spherical guide mandrel 421 is fitted within the bearing seat 422. The spherical guide mandrel 421 is a stepped threaded shaft with a threaded tail. The spherical guide mandrel 421 is locked in place by the locking cap 423. A spring 424 is mounted on the spherical guide mandrel 421 at the front of the locking cap 423. A spherical body is provided at the head of the spherical guide mandrel 421 to contact the inner wall of the inner sleeve and form an internal elastic support. Under the action of the spring 424, the spherical head of each elastic support 420 can adaptively and elastically press against the inner wall of the inner sleeve, providing internal support force and compensating for a certain degree of inner wall non-roundness, thus preventing deformation of the inner sleeve due to rigid clamping.

[0031] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the elastic support 420 is equipped with a spring 424, the locking cap 423 is locked and fixed to the spherical guide spindle 421 by the spring 424, and an elastic support is formed when the spherical body of the spherical guide spindle 421 contacts the inner wall of the inner sleeve.

[0032] To further optimize the structure of this embodiment, the connecting sleeve 520 is a circular sleeve, with one end threadedly connected to the multi-stage guide rod 220 and the other end splinedly connected to the cutter head 510 to transmit torque; The cutter head 510 has a disc-shaped structure. A connecting head 511 is provided at one end of the cutter head 510, which is splinedly connected to the connecting sleeve 520. Spokes 512 are arranged in a circular array on the cutter head 510. Through holes 513 are provided on the spokes 512 for the wire rope 610 to pass through, thereby controlling the boring mechanism 500. A screw nut sleeve 530 is provided at the other end of the cutter head 510. A self-aligning screw 540 is mounted on the screw nut sleeve 530 and locked in place by a self-aligning nut 541. The self-aligning screw 540 is a stepped shaft with an inclined surface at its top. The cutter head 510 has a circular array of cutter bodies 550 that are staggered with the spokes 512. The cutter bodies 550 are locked and fixed by the clamping cap 560. The bottom of the cutter body 550 is provided with a slope, which contacts the inclined surface of the self-aligning screw 540. Rotating the self-aligning screw 540 compresses the cutter body 550, and the cutter body 550 is adjusted radially to set the boring depth. Then, the position of the cutter body 550 is adjusted to abut against the inner wall of the inner sleeve, thereby performing the boring operation. In this embodiment, there are three spokes 512 and three blades 550.

[0033] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the self-aligning screw 540 has an inclined surface and the cutter body 550 has a slope, when the self-aligning screw 540 is rotated, the self-aligning screw 540 presses the cutter body 550 to make radial adjustment, so that the cutting head at the front end of the cutter body 550 abuts against the inner wall of the inner sleeve to perform boring operation.

[0034] As a standard technical option, the tail frame 800 includes a tail seat 810, a tail shaft 820, a tail end frame 830, and a tail end foot 840. The tail end frame 830 is a frame structure. Tail seats 810 are arranged at the end of the tail end frame 830. Tail shaft 820 is assembled in the tail seat 810. The tail shaft 820 is fitted with bearings and rotates. Tail end feet 840 are provided at the bottom of the tail end frame 830 for adjusting the center height of the tail shaft 820.

[0035] Preferably, the tube support 720 includes a sealing plate 721, a sleeve plate 722, and a cylindrical ring 723; the sealing plate 721 is a disc structure and is fitted onto the tail shaft 820; the sleeve plate 722 is a ring structure; and the cylindrical ring 723 is a hollow sleeve and is disposed between the sealing plate 721 and the sleeve plate 722 to form a whole; a baffle 730 is housed in the inner cavity of the tube support 720 and is fixed to the extension end of the tail shaft 820.

[0036] To further optimize the structure of this embodiment, the chuck 710 is arranged in a ring array on the side of the sleeve plate 722 in the tube support 720, including a clamping plate 711, a lead nut 712, a lead screw 713, a lock nut 714, and a chuck 715; The clamping plate 711 is a frame structure and is evenly located on the side of the sleeve plate 722; The nut 712 is located in the middle of the clamping plate 711 and is fixed by screw connection; Lead screw 713 is a stepped shaft that is threadedly connected to lead screw nut 712; The lock nut 714 is located at the tail of the lead screw 713 and is screwed to the lead screw 713 to lock the lead screw 713 and prevent it from loosening. The collet 715 is located at the head of the lead screw 713 and is movably connected to the lead screw 713. It has an arc-shaped surface and is used to clamp the inner sleeve. The rotating screw 713 pulls the chuck 715 to move radially, adjusting the center of the inner sleeve and clamping the outer circle of the end of the inner sleeve together.

[0037] In this embodiment, there are four chucks 710.

[0038] The technical solutions described in the embodiments of this application have at least the following technical effects or advantages: Since the baffle 730 is housed in the tube support 720 and connected to the tail shaft 820, the baffle 730 can rotate. When the chuck 710 clamps the inner sleeve, the wire rope 610 connected to the rope hook 620 on the baffle 730 can also rotate with it. Thus, the wire rope 610 rotates synchronously with the boring mechanism 500 and restrains the boring mechanism 500 to perform boring.

[0039] The working process of this embodiment: Includes the following steps: Step 1: According to the inner diameter of the inner sleeve, adjust the elastic support 420 in the inner support mechanism 400 so that its spherical guide mandrel 421 elastically supports the inner sleeve; at the same time, adjust the self-aligning screw 540 in the boring mechanism 500 and adjust the radial extension of the tool body 550 so that the tool head of the tool body 550 can bore the weld repair area. Step 2: Select the required multi-stage guide rod 220 and adjust the length of the wire rope 610 according to the length of the inner sleeve; Step 3: Erect the tail frame 800 at one end of the inner sleeve and clamp and fix the inner sleeve with the chuck 710 of the tube seat 700; erect the head frame 300 at the other end of the inner sleeve and connect the inner support mechanism 400 through the support sleeve. The elastic support 420 automatically springs open to support the inner wall of the inner sleeve, so that the elastic support 420 forms a support point at the other end of the inner sleeve; adjust the head end foot 340 and the tail end foot 840 to ensure that the transmission guide rod 200, the inner sleeve, and the tail shaft 820 are collinear. Step 4: The drive shaft 130 of the boring feed trolley 100 is connected to the drive guide rod 200. The multi-stage guide rod 220 passes through the support sleeve and the cover 410 of the inner support mechanism 400 in sequence. The boring mechanism 500 is assembled through the connecting sleeve 520 and connected to the end of the drive guide rod 200. Step 5: Connect one end of the wire rope 610 to the lug 450 of the inner support mechanism 400 through the rope hook 620, pass it through the through hole 513 of the boring mechanism 500 in sequence, and connect the other end to the baffle 730 of the tube seat 700 through the rope hook 620. Adjust the rope hook 620 to tension the wire rope 610. Step 6: Start the drive motor 120 to drive the boring mechanism 500 on the multi-stage guide rod 220 to rotate. At the same time, start the feed motor 150 to drive the boring feed trolley 100 to slide towards the tail frame 800, driving the boring mechanism 500 on the multi-stage guide rod 220 to feed axially, boring the welded part or the entire inner wall of the inner sleeve. At the same time, by increasing the multi-stage guide rod 220, the axial displacement is extended, and the centering steel cable 600 constrains the radial runout of the cutter head 510 throughout the process, thereby realizing the boring of the inner sleeve. Step 7: After boring is completed, the feed motor 150 reverses, the boring feed trolley 100 retracts, and the boring mechanism 500 exits the inner sleeve; release the chuck 710 and proceed to the next inner sleeve boring operation.

[0040] It is worth noting that all content not described in detail in the specification belongs to existing technology known to those skilled in the art, and the model parameters of the polyoxymethylene crystallizer and inner sleeve are not specifically limited and can be determined using conventional equipment. Electrical control components not mentioned in this technical solution are not shown in the figures because they belong to existing technology, and will not be described further here. The description of this invention is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0041] Finally, it should be noted that: The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer, characterized in that: It includes a boring feed trolley (100), a transmission guide rod (200), a head frame (300), an internal support mechanism (400), a boring mechanism (500), a centering cable (600), a tube seat (700), and a tail frame (800). The transmission guide rod (200) includes a connecting rod (210) and a multi-stage guide rod (220). The multi-stage guide rod (220) is connected to the output end of the connecting rod (210). The multi-stage guide rod (220) is formed by connecting the guide rods in series. One end of the guide rod is provided with an internal thread and the other end is provided with an external thread. The internal thread and the external thread are screwed together to form the multi-stage guide rod (220). The number of guide rod sections is increased according to the length of the inner sleeve to transmit torque to the boring operation position of the inner sleeve. The boring feed trolley (100) has a body (110), on which a drive motor (120) is installed, which is connected to the connecting rod (210) via a drive shaft (130); a feed motor (150) is also installed on the body (110), which drives the pulley (170) to slide on the guide rail via the trolley shaft (160), thereby realizing the reciprocating feed motion of the boring feed trolley (100) and the driven drive rod (200) along the inner sleeve axis; The first frame (300) is set at one end of the inner sleeve. The first seat (310) is set on the first frame (300). The first seat (310) is provided with a support sleeve. The multi-stage guide rod (220) passes through the support sleeve and extends into the inner cavity of the inner sleeve. The inner support mechanism (400) is connected to the support sleeve, and elastic supports (420) are arrayed on the inner support mechanism (400) to form the inner support point of the inner sleeve; the inner support mechanism (400) is also arrayed with lugs (450). The boring mechanism (500) includes a cutter head (510) and a connecting sleeve (520); the cutter head (510) is connected to the extension end of the multi-stage guide rod (220) through the connecting sleeve (520) and rotates with it; a cutter body (550) is mounted on the cutter head (510), and an alloy cutter head is embedded at the front end of the cutter body (550) for boring the inner cavity of the inner sleeve for welding repair; spokes (512) are evenly distributed on the cutter head (510), and through holes (513) are provided on the spokes (512). The core-stabilizing cable (600) includes a wire rope (610) and a hook (620); hooks (620) are fitted at both ends of the wire rope (610), and one end of the wire rope (610) is connected to a lug (450) through the hook (620). The wire rope (610) passes through a through hole (513) and radially restrains the boring mechanism (500). The tail frame (800) is located at the other end of the inner sleeve. A tail seat (810) is provided at one end of the tail frame (800). A tail shaft (820) is assembled in the tail seat (810). The tail shaft (820) is supported by bearings and rotates freely. It is concentric and collinear with the drive shaft (130). The tube seat (700) is located at the other end of the tail frame (800) and includes a chuck (710), a tube support seat (720) and a baffle (730); the output end of the tail shaft (820) extends into the tube support seat (720) and is connected to the baffle (730), and a rope hook (620) is provided on the baffle (730) to connect the wire rope (610); a chuck (710) is provided on the side of the tube support seat (720) to clamp the outer circle of the end of the inner sleeve and form an outer clamping point; One end of the inner sleeve is clamped by a chuck (710) and the other end is supported by the elastic support (420) of the inner support mechanism (400), forming a two-point fixation. The boring mechanism (500) extends into the inner sleeve through a multi-stage guide rod (220) and rotates to perform boring operations. The wire rope (610) passes through the through hole (513) of the spoke plate (512). The wire rope (610) is connected to the lug (450) of the inner support mechanism (400) through the rope hook (620), and the other end is connected to the baffle (730) of the tube seat (700) through the rope hook (620). The tensioned wire rope (610) swings with the rotation of the cutter head (510) during the boring process, forming a dynamic radial constraint to realize the boring operation of the boring mechanism (500).

2. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The boring feed trolley (100) includes a car body (110), a drive motor (120), a drive shaft (130), a drive shaft seat (140), a feed motor (150), a trolley shaft (160), and a pulley (170). A drive motor (120) is provided at the end of the vehicle body (110), and a drive pulley (121) is provided at the output end of the drive motor (120); a drive shaft seat (140) is arranged on the top of the vehicle body (110), and a drive shaft (130) is assembled between the two drive shaft seats (140). The drive shaft (130) is inlaid with bearings and has two-point support and fixation; a drive driven pulley (131) is provided at the outer end of the drive shaft (130), and the drive drive pulley (121) of the drive motor (120) drives the drive driven pulley (131) through the drive belt, thereby driving the drive shaft (130) to rotate; A feed motor (150) is provided on the side of the car body (110), and a feed drive pulley (151) is provided at the output end of the feed motor (150). At the bottom of the car body (110), there are trolley shafts (160) supported by axle seats. Each trolley shaft (160) is provided with a pulley (170), which sits on a guide rail. One of the trolley shafts (160) has a feed driven pulley (161) at its outer end. The feed drive pulley (151) of the feed motor (150) drives the feed driven pulley (161) via the feed belt, driving the pulley (170) to slide along the guide rail, so that the boring feed trolley (100) feeds along the inner sleeve axis.

3. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The first frame (300) includes a first base (310), a first end frame (320), a base plate (330), and a first end foot (340); A seat plate (330) is provided on the upper part of the first end frame (320), and a first seat (310) is mounted on the seat plate (330); a first end foot (340) is provided on the lower part of the first end frame (320) to adjust the center height of the first seat (310) so that the multi-stage guide rod (220) is collinear with the center of the inner sleeve; The first seat (310) is a split mechanism, including the lower seat (311), the upper seat (312) and the support ring (313). The lower seat (311) is an arc-shaped plate connected to the seat plate (330); the upper seat (312) is also an arc-shaped plate, screwed to the lower seat (311) to form a clamping structure; a support ring (313) is provided between the upper seat (312) and the lower seat (311). The support ring (313) is a cylindrical structure. A support sleeve is provided inside the support ring (313) and is supported and fixed by a rolling bearing. A multi-stage guide rod (220) passes through the support sleeve and is clearance-fitted with it. The multi-stage guide rod (220) slides along the support sleeve. The support ring (313) is assembled between the upper seat (312) and the lower seat (311) through the adjustment component of the circular array and the center is adjusted.

4. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 3, characterized in that: The adjustment assembly includes a connecting ring (314), a connecting shaft (315), and an adjustment screw (316). The connecting ring (314) is a circular hook, and the circular array is on the outer surface of the support ring (313); The adjusting screw (316) has a Y-shaped structure with a thread on the upper part. It passes through the upper seat (312) and the lower seat (311) and is connected and fixed by the adjusting nut 317. At the same time, it adjusts the position of the support ring (313) between the upper seat (312) and the lower seat (311). The connecting shaft (315) is a shaft structure that passes through the two wings at the bottom of the adjusting screw (316) and connects to the connecting ring (314), so that the support ring (313) is fixed between the upper seat (312) and the lower seat (311).

5. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The inner support mechanism (400) includes a cover (410), an elastic support (420), an end cap (430), a stud (440), and a lug (450). The end cap (430) is a disc structure, one of which is connected to the support sleeve, and the other is connected to the cover (410). The two end caps (430) are connected and fixed by studs (440). The outer surface of the cover (410) has an array of elastic supports (420) in a ring to support the inner surface of the inner sleeve; at the end of the cover (410), there is an array of lugs (450) in a ring, and the lugs (450) and the elastic supports (420) are distributed alternately; there are two sets of elastic supports (420) and they are arranged alternately; the cover (410) includes a guide shell (411), which is a horizontal cylindrical structure. A first inlet (413) is provided at one end of the guide shell (411), and a connecting spoke (414) is provided adjacent to the first inlet (413). The connecting spoke (414) is used to connect the end cap (430) to form an integral whole; a tail outlet (412) is provided at one end of the guide shell (411), and the multi-stage guide rod (220) enters through the first inlet (413) and extends out through the tail outlet (412); The elastic support (420) includes a spherical guide spindle (421), a bearing seat (422), a locking cap (423), and a spring (424). The bearing seat (422) is arranged in a circular array on the outer surface of the guide shell (411). The spherical guide spindle (421) is assembled in the bearing seat (422). The spherical guide spindle (421) is a stepped threaded shaft with a thread at the tail. The spherical guide spindle (421) is locked and fixed by the locking cap (423). A spring (424) is provided at the front of the locking cap (423) and is fitted on the spherical guide spindle (421). A spherical body is provided at the head of the spherical guide spindle (421) for contacting the inner wall of the inner sleeve to form an internal elastic support. The elastic supports (420) are in two sets and are arranged alternately.

6. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The connecting sleeve (520) is a ring sleeve, one end of which is threadedly connected to the multi-stage guide rod (220), and the other end is splinedly connected to the cutter head (510) to transmit torque; The cutter head (510) has a disc-shaped structure. A connector (511) is provided at one end of the cutter head (510), and the connector (511) is splinedly connected to the connector sleeve (520). A circular array of spokes (512) is arranged on the cutter head (510), and through holes (513) are provided on the spokes (512). A screw thread sleeve (530) is provided at the other end of the cutter head (510). A self-aligning screw (540) is mounted on the screw thread sleeve (530) and locked in place by a self-aligning nut (541). The self-aligning screw (540) is a stepped shaft with an inclined surface at its top. On the cutter head (510), there are cutter bodies (550) arranged in a circular array, which are staggered with the spokes (512). The cutter bodies (550) are locked and fixed by clamping caps (560). The bottom of the cutter body (550) is provided with a slope, which contacts the inclined surface of the self-aligning screw (540). Rotating the self-aligning screw (540) squeezes the cutter body (550), and the cutter body (550) is adjusted radially and the boring depth is set. The number of spokes (512) and blades (550) is three.

7. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The tail frame (800) includes a tail seat (810), a tail shaft (820), a tail end frame (830), and a tail end foot (840). The tail end frame (830) is a frame structure. Tail seats (810) are arranged at the end of the tail end frame (830). Tail shaft (820) is assembled in the tail seat (810). The tail shaft (820) is fitted with bearings and rotates. Tail end feet (840) are provided at the bottom of the tail end frame (830) to adjust the center height of the tail shaft (820).

8. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 1, characterized in that: The pipe support (720) includes a sealing plate (721), a sleeve plate (722), and a cylindrical ring (723); The sealing plate (721) is a disc structure and is fitted onto the tail shaft (820). The sleeve plate (722) is a ring structure. The cylindrical ring (723) is a hollow sleeve and is set between the sealing plate (721) and the sleeve plate (722) to form a whole. A baffle (730) is housed in the inner cavity of the tube support seat (720) and the baffle (730) is fixed to the extension end of the tail shaft (820).

9. The device for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer according to claim 8, characterized in that: The chuck (710) is arranged in a ring on the side of the sleeve plate (722) in the tube support base (720), including a clamping plate (711), a lead screw nut (712), a lead screw (713), a lock nut (714), and a chuck (715). The clamping plate (711) is a frame structure and is evenly located on the side of the sleeve plate (722); The nut (712) is located in the middle of the clamping plate (711) and is fixed by screws; The lead screw (713) is a stepped shaft that is threadedly connected to the lead nut (712); The lock nut (714) is located at the tail of the lead screw (713) and is screwed to the lead screw (713) to lock the lead screw (713) and prevent it from loosening; The collet (715) is located at the head of the lead screw (713), is movably connected to the lead screw (713), and has an arc-shaped surface for clamping the inner sleeve; Among them, the rotating screw (713) pulls the chuck (715) to move radially, adjusts the center of the inner sleeve and clamps the outer circle of the end of the inner sleeve together; There are four chucks (710).

10. A method for boring the inner surface of the inner sleeve of a polyoxymethylene crystallizer, using the boring device for the inner surface of the inner sleeve of a polyoxymethylene crystallizer as described in any one of claims 1-9, characterized in that: Includes the following steps: Step 1: According to the inner diameter of the inner sleeve, adjust the elastic support (420) in the inner support mechanism (400) so that its spherical guide mandrel (421) elastically supports the inner sleeve; at the same time, adjust the self-aligning screw (540) in the boring mechanism (500) and adjust the radial extension of the tool body (550) so that the tool head of the tool body (550) can bore the weld repair area; Step 2: Select the required multi-stage guide rod (220) and adjust the length of the wire rope (610) according to the length of the inner sleeve; Step 3: Set up a tail frame (800) at one end of the inner sleeve and clamp and fix the inner sleeve with the chuck (710) of the tube seat (700); set up a head frame (300) at the other end of the inner sleeve and connect the inner support mechanism (400) through the support sleeve. The elastic support (420) automatically pops open to support the inner wall of the inner sleeve, so that the elastic support (420) forms a support point at the other end of the inner sleeve; adjust the head end foot (340) and tail end foot (840) to ensure that the transmission guide rod (200), the inner sleeve, and the tail shaft (820) are collinear. Step 4: The drive shaft (130) of the boring feed trolley (100) is connected to the drive guide rod (200). The multi-stage guide rod (220) passes through the cover (410) of the support sleeve and the inner support mechanism (400) in sequence. The boring mechanism (500) is assembled through the connecting sleeve (520) and the boring mechanism (500) is connected to the end of the drive guide rod (200). Step 5: Connect one end of the wire rope (610) to the lug (450) of the inner support mechanism (400) through the rope hook (620), pass it through the through hole (513) of the boring mechanism (500) in sequence, and connect the other end to the baffle (730) of the tube seat (700) through the rope hook (620). Adjust the rope hook (620) to tension the wire rope (610); Step 6: Start the drive motor (120) to drive the boring mechanism (500) on the multi-stage guide rod (220) to rotate. At the same time, start the feed motor (150) to drive the boring feed trolley (100) to slide towards the tail frame (800), driving the boring mechanism (500) on the multi-stage guide rod (220) to feed axially, boring the welded part of the inner sleeve or the entire inner wall; at the same time, by adding the multi-stage guide rod (220), the axial displacement is extended, and the centering steel cable (600) constrains the radial runout of the cutter head (510) throughout the process, thereby realizing the boring of the inner sleeve; Step 7: After boring is completed, the feed motor (150) reverses, the boring feed trolley (100) retracts, and the boring mechanism (500) exits the inner sleeve; the chuck (710) is released, and the next inner sleeve boring operation begins.

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