A tail pipe thread follow-up fastening tool for split nozzle maintenance process

Abstract

A tail pipe thread follow-up fastening tool for split nozzle maintenance process, comprising a front cylinder, a rear cylinder, a limiting sliding cylinder, a support ring seat, a screw and a fixing bolt. A threaded hole is arranged on the inner cylindrical surface of one end of the front cylinder; the support ring seat is fixed on the other end of the front cylinder by the screw, and the outer cylindrical surface is closely combined with the inner cylindrical surface of the front cylinder, and the other part is exposed; the limiting sliding cylinder is located at the middle position inside the front cylinder; the other end of the rear cylinder is sleeved on the exposed part of the support ring seat from the front cylinder; a plurality of through holes are arranged on the other end of the rear cylinder; the fixing bolt is screwed into the pre-set threaded hole of the support ring seat from the end of the support ring seat combined with the rear cylinder, and the bolt rod part is penetrated out from the other end of the support ring seat. By adjusting the length of the part of the fixing bolt penetrated out from the support ring seat, the axial pressure of the limiting sliding cylinder on the tail pipe is changed, so as to fasten the tail pipe and prevent the tail pipe from following up during the disassembly of the tool.

Description

Technical Field

[0001] This invention relates to a fastening fixture for preventing tailpipe thread rotation during the maintenance of split-type nozzles. It is used to prevent tailpipe rotation during disassembly of the fixture after the tailpipe has been fastened during maintenance, and belongs to the field of solid rocket motor technology. Background Technology

[0002] Solid rocket motors must operate normally according to design requirements throughout the entire rocket's lifespan and meet long-term service life requirements. Therefore, when a solid rocket malfunctions, life analysis is often performed followed by the use of tooling to implement necessary repairs to ensure continued long-term operation. Small to medium-diameter solid rocket motors typically include a tailpipe for exhaust gas emission and energy conversion. The tailpipe's front and rear interfaces are generally threaded; the front interface connects to the combustion chamber, and the rear interface connects to the diffuser. When the tailpipe is damaged, it usually requires replacement using fastening tooling. However, after replacing the tailpipe with existing tooling, when removing the tooling from the new tailpipe, the new tailpipe often rotates synchronously with the tooling. If a wrench is used to further tighten the tooling to remove it from the tailpipe, the threaded fastening between the tailpipe and the combustion chamber will fail, rendering the repair ineffective. Summary of the Invention

[0003] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a fastening fixture for preventing the tailpipe thread from rotating during the maintenance of split nozzles. This fastening fixture, by adjusting the fixing bolts, can change the axial pressure applied to the tailpipe, thereby solving the problem of tailpipe rotation when the existing fastening fixture is removed from the tailpipe.

[0004] The technical solution of this invention is:

[0005] A fastening fixture for preventing tailpipe thread rotation during the maintenance of split nozzles includes: a front cylinder, a rear cylinder, a limiting slide, a support ring seat, screws, and fixing bolts;

[0006] The front cylinder, rear cylinder, limiting slide cylinder, and support ring seat are all cylindrical structures with open ends. One end of the front cylinder has a threaded inner cylindrical surface for fastening the tailpipe. The support ring seat is coaxially fixed to the other end of the front cylinder with screws; part of it is located inside the front cylinder, with its outer cylindrical surface tightly fitted to the inner cylindrical surface of the front cylinder, while the other part is exposed. The limiting slide cylinder is located inside the front cylinder, with its outer cylindrical surface tightly fitted to the inner cylindrical surface of the front cylinder. The limiting slide cylinder is located between the threaded section on the front cylinder and the support ring seat.

[0007] One end of the rear cylinder is coaxially sleeved onto the cylindrical section of the support ring seat exposed from the front cylinder. The rear cylinder and the support ring seat are welded together by electron beam welding. The other end of the rear cylinder has multiple through holes circumferentially for installing wrenches. The support ring seat has multiple threaded through holes evenly distributed circumferentially on its end face. Each threaded through hole is opened along the length of the support ring seat. The fixing bolt is screwed into the threaded through hole from the end of the support ring seat that is in contact with the rear cylinder, and the end of the bolt protrudes from the other end of the support ring seat.

[0008] When fastening the tailpipe, tighten the fixing bolts to apply axial pressure to the tailpipe using the limiting slide, thus completing the tailpipe fastening. When removing the fastening fixture from the tailpipe, loosen the fixing bolts to release the axial pressure applied to the tailpipe by the limiting slide, thereby preventing the tailpipe from rotating during the removal of the fixture.

[0009] After screwing the tail tube into the front cylinder along the thread, tighten the fixing bolt. The part of the fixing bolt that passes through the support ring seat abuts against the end face of one end of the limiting slide cylinder, and the other end of the limiting slide cylinder abuts against the tail tube. The limiting slide cylinder cannot slide inside the front cylinder. At this time, the limiting slide cylinder applies axial pressure to the tail tube, thereby increasing the friction between the tail tube and the front cylinder. This makes it easier to install the tail tube, as the tail tube will not move axially inside the front cylinder when the tail tube is rotated by tightening the fastening fixture.

[0010] When the tailpipe is installed and the fastening fixture is removed from the tailpipe, the fixing bolts are loosened. The part of the fixing bolts that protrudes from the support ring seat no longer applies axial pressure to the limiting slide. At this time, the limiting slide slides in the front cylinder, relieving the axial pressure applied to the tailpipe, thereby reducing the friction between the tailpipe and the front cylinder. This ensures that when the fastening fixture is tightened to remove the tailpipe from the tailpipe, the tailpipe will not rotate with the fastening fixture.

[0011] Furthermore, the thread on the front cylinder is a sawtooth thread with a nominal diameter of 127 mm and a pitch of 2 mm.

[0012] Furthermore, the rear cylinder has four through holes in its circumferential direction, each with a diameter of 27mm.

[0013] Furthermore, the inner diameter of the limiting slide is designed in a stepped manner, with the inner diameter of the end of the limiting slide near the thread on the front cylinder being 60mm and the inner diameter of the end near the support ring being 115mm.

[0014] Furthermore, the inner diameter of the support ring seat is 66mm, and the support ring seat has 8 threaded through holes of type M12.

[0015] Furthermore, the specific process for replacing the damaged tailpipe on the combustion chamber housing using fastening tools is as follows:

[0016] Step 1: Connect the front cylinder to the damaged tailpipe that needs to be replaced through the thread on the front cylinder, and at the same time install a wrench on the through hole of the rear cylinder;

[0017] The second step is to tighten the fixing bolts so that the fixing screws abut against the end face of one end of the limiting slide cylinder, while the end face of the other end of the limiting slide cylinder abuts against the tail tube. At this time, the limiting slide cylinder applies axial pressure to the tail tube, increasing the friction between the tail tube and the front cylinder.

[0018] Step 3: Tighten the fastening fixture with a wrench to rotate the damaged tailpipe, thereby removing the tailpipe from the combustion chamber housing;

[0019] Step 4: Loosen the fixing bolts to release the pressure exerted by the limiting slide on the damaged tailpipe; tighten the fastening fixture with a wrench while keeping the tailpipe stationary and rotating the fastening fixture to remove the damaged tailpipe from the fastening fixture.

[0020] Step 5: Connect the front cylinder to one end of the new tailpipe using the threads on the front cylinder, and tighten the fixing bolts again;

[0021] Step 6: Tighten the fastening fixture by using the installation wrench on the rear cylinder through hole, causing the new tailpipe to rotate, so that the other end of the new tailpipe is screwed into the thread on the combustion chamber shell, and the new tailpipe is fastened to the combustion chamber shell.

[0022] Step 7: Loosen the fixing bolts to release the pressure exerted by the limiting slide on the new tailpipe, thereby reducing the friction between the new tailpipe and the front cylinder; tighten the fastening fixture with a wrench while keeping the tailpipe stationary and rotating the fastening fixture, thereby removing the fastening fixture from the new tailpipe and completing the tailpipe replacement.

[0023] This invention also proposes a method for replacing a tailpipe to prevent thread rotation. This method is based on the aforementioned anti-thread rotation fastening fixture for the tailpipe, and the specific steps are as follows:

[0024] Step 1: Connect the fastening fixture to the damaged tail tube that needs to be replaced by using the threads on the front cylinder of the anti-tail tube thread and the fastening fixture. At the same time, install a wrench on the through hole of the rear cylinder.

[0025] The second step is to tighten the fixing bolts so that the fixing screws abut against the end face of one end of the limiting slide cylinder, while the end face of the other end of the limiting slide cylinder abuts against the tail tube. At this time, the limiting slide cylinder applies axial pressure to the tail tube, increasing the friction between the tail tube and the front cylinder.

[0026] Step 3: Tighten the fastening fixture with a wrench to rotate the damaged tailpipe, thereby removing the tailpipe from other equipment;

[0027] Step 4: Loosen the fixing bolts to release the pressure exerted by the limiting slide on the damaged tailpipe; tighten the fastening fixture with a wrench while keeping the tailpipe stationary and rotating the fastening fixture to remove the fastening fixture from the damaged tailpipe.

[0028] Step 5: Connect the front cylinder to one end of the new tailpipe using the threads on the front cylinder, and tighten the fixing bolts again;

[0029] Step 6: Tighten the fastening fixture by using the wrench on the through hole of the rear cylinder to rotate the new tail tube, so that the other end of the new tail tube is screwed into the thread of other equipment, and the new tail tube is fastened to other equipment.

[0030] Step 7: Loosen the fixing bolts to release the pressure exerted by the limiting slide on the new tailpipe, thereby reducing the friction between the new tailpipe and the front cylinder; tighten the fastening fixture with a wrench while keeping the tailpipe stationary and rotating the fastening fixture, thereby removing the fastening fixture from the new tailpipe and completing the tailpipe replacement.

[0031] The advantages of this invention compared to the prior art are:

[0032] (1) By adjusting the fixing bolts, the axial pressure applied to the tail tube by the limiting slide can be released, thereby reducing the friction between the front cylinder and the tail tube and preventing the tail tube from rotating when the fastening fixture is removed from the tail tube.

[0033] (2) By adjusting the fixing bolt, the limiting slide can apply axial pressure to the tail tube, thereby increasing the friction between the front cylinder and the tail tube. When the tail tube is rotated by tightening the fastening fixture, the tail tube will not move axially in the front cylinder, which facilitates the installation of the tail tube. Attached Figure Description

[0034] Figure 1 This is a three-dimensional sectional view of a fastening fixture for preventing the thread and rotation of the tailpipe during the maintenance process of a split nozzle according to the present invention.

[0035] Figure 2 This is a cross-sectional view of a fastening fixture for preventing the tailpipe thread from turning during the maintenance process of a split nozzle according to the present invention. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0037] like Figure 1 and 2 As shown, the present invention provides a fastening fixture for preventing the tailpipe thread from rotating during the maintenance process of a split nozzle, comprising: a front cylinder 1, a rear cylinder 2, a limiting slide cylinder 3, a support ring seat 4, screws 5, and fixing bolts 6.

[0038] The front cylinder 1, rear cylinder 2, limiting slide cylinder 3, and support ring seat 4 are all cylindrical structures with openings at both ends. One end of the front cylinder 1 has a thread on its inner cylindrical surface for fastening the tail tube. The support ring seat 4 is coaxially fixed to the other end of the front cylinder 1 by screws 5. A part of the support ring seat 4 is located inside the front cylinder 1, and its outer cylindrical surface is in close contact with the inner cylindrical surface of the front cylinder 1, while the other part is exposed. The limiting slide cylinder 3 is located inside the front cylinder 1, and its outer cylindrical surface is in close contact with the inner cylindrical surface of the front cylinder 1. The limiting slide cylinder 3 is located between the thread on the front cylinder 1 and the support ring seat 4.

[0039] One end of the rear cylinder 2 is coaxially sleeved on the cylindrical section of the support ring seat 4 exposed from the front cylinder 1. The rear cylinder 2 and the support ring seat 4 are welded together by electron beam welding. The other end of the rear cylinder 2 is provided with multiple through holes in the circumferential direction for installing wrenches. The support ring seat 4 is provided with multiple threaded through holes evenly in the circumferential direction on the end face. Each threaded through hole is opened along the length direction of the support ring seat 4. The fixing bolt 6 is screwed into the threaded through hole from the end of the support ring seat 4 that is in contact with the rear cylinder 2, and the end of the bolt protrudes from the other end of the support ring seat 4.

[0040] When fastening the tailpipe, tighten the fixing bolt 6 to apply axial pressure to the tailpipe using the limiting slide 3, thereby completing the tailpipe fastening. When removing the fastening fixture from the tailpipe, loosen the fixing bolt 6 to release the axial pressure applied to the tailpipe by the limiting slide 3, thereby preventing the tailpipe from rotating during the removal of the fixture.

[0041] After screwing the tail tube into the front cylinder 1 along the thread, tighten the fixing bolt 6. The part of the fixing bolt 6 that protrudes from the support ring seat 4 abuts against the end face of one end of the limiting slide cylinder 3, and the other end of the limiting slide cylinder 3 abuts against the tail tube. The limiting slide cylinder 3 cannot slide inside the front cylinder 1. At this time, the limiting slide cylinder 3 applies axial pressure to the tail tube, thereby increasing the friction between the tail tube and the front cylinder 1. This makes it easier to install the tail tube by rotating it through the tightening fixture without moving it axially inside the front cylinder 1.

[0042] When the tailpipe is installed and the fastening fixture is removed from the tailpipe, the fixing bolt 6 is loosened. The part of the fixing bolt 6 that passes through the support ring seat 4 no longer applies axial pressure to the limiting slide cylinder 3. At this time, the limiting slide cylinder 3 slides in the front cylinder 1, which releases the axial pressure applied to the tailpipe, thereby reducing the friction between the tailpipe and the front cylinder 1. This ensures that when the fastening fixture is tightened to remove the tailpipe from the tailpipe, the tailpipe will not rotate with the fastening fixture.

[0043] In summary, when installing the tailpipe, the present invention can adjust the fixing bolt 6 to allow the limiting slide 3 to apply axial pressure to the tailpipe, thereby increasing the friction between the front cylinder 1 and the tailpipe and facilitating the installation of the tailpipe. When removing the fastening fixture from the tailpipe, the present invention can loosen the fixing bolt 6 to release the axial pressure applied to the tailpipe by the limiting slide 3, thereby reducing the friction between the front cylinder 1 and the tailpipe and preventing the tailpipe from rotating when the fastening fixture is removed from the tailpipe.

[0044] Furthermore, the thread provided on the front cylinder 1 is a sawtooth thread with a nominal diameter of 127 mm and a pitch of 2 mm.

[0045] Furthermore, the rear cylinder 2 has four through holes in its circumference, each with a diameter of 27mm.

[0046] Furthermore, the inner diameter of the limiting slide cylinder 3 is designed in a stepped manner. The inner diameter of the end of the limiting slide cylinder 3 near the thread on the front cylinder 1 is 60mm, and the inner diameter of the end near the support ring seat 4 is 115mm.

[0047] The inner diameter of the support ring seat 4 is 66mm, and the support ring seat 4 has 8 threaded through holes of type M12.

[0048] Furthermore, the specific process for replacing the damaged tailpipe on the combustion chamber housing using fastening tools is as follows:

[0049] (1) Connect the front cylinder 1 to the damaged tail pipe that needs to be replaced through the thread on the front cylinder 1, and install a wrench on the through hole of the rear cylinder 2 at the same time.

[0050] (2) Tighten the fixing bolt 6 so that the fixing screw 6 abuts against the end face of one end of the limiting slide cylinder 3, and at the same time the end face of the other end of the limiting slide cylinder 3 abuts against the tail pipe. At this time, the limiting slide cylinder 3 applies axial pressure to the tail pipe, increasing the friction between the tail pipe and the front cylinder 1.

[0051] (3) Tighten the fastening fixture with a wrench to rotate the damaged tailpipe, thereby removing the tailpipe from the combustion chamber housing;

[0052] (4) Loosen the fixing bolt 6 to release the pressure applied by the limiting slide 3 to the damaged tail tube; tighten the fastening fixture with a wrench, keeping the tail tube stationary while the fastening fixture rotates, thereby removing the damaged tail tube from the fastening fixture.

[0053] (5) Connect the front cylinder 1 to one end of the new tail pipe through the thread on the front cylinder 1, and tighten the fixing bolt 6 again;

[0054] (6) Tighten the fastening fixture by using the installation wrench on the through hole 2 of the rear cylinder to drive the new tailpipe to rotate, so that the other end of the new tailpipe is screwed into the thread on the combustion chamber shell, and the new tailpipe is fastened to the combustion chamber shell.

[0055] (7) Loosen the fixing bolt 6 to release the pressure applied to the new tail tube by the limiting slide 3, thereby reducing the friction between the new tail tube and the front cylinder; tighten the fastening fixture with a wrench, keep the tail tube stationary while the fastening fixture rotates, thereby removing the fastening fixture from the new tail tube and completing the replacement of the tail tube.

[0056] This invention also proposes a method for replacing a tailpipe to prevent thread rotation. This method is based on the aforementioned anti-thread rotation fastening fixture for the tailpipe, and the specific steps are as follows:

[0057] (1) Connect the fastening fixture to the damaged tail tube that needs to be replaced by threading the thread on the front cylinder 1 of the anti-tail tube thread and the fastening fixture, and install a wrench on the through hole of the rear cylinder 2.

[0058] (2) Tighten the fixing bolt 6 so that the fixing screw 6 abuts against the end face of one end of the limiting slide cylinder 3, and at the same time the end face of the other end of the limiting slide cylinder 3 abuts against the tail pipe. At this time, the limiting slide cylinder 3 applies axial pressure to the tail pipe, increasing the friction between the tail pipe and the front cylinder 1.

[0059] (3) Tighten the fixture with a wrench to rotate the damaged tail tube, thereby removing the tail tube from other equipment;

[0060] (4) Loosen the fixing bolt 6 to release the pressure exerted by the limiting slide 3 on the damaged tail pipe; tighten the fastening fixture with a wrench while keeping the tail pipe stationary and rotating the fastening fixture to remove the fastening fixture from the damaged tail pipe.

[0061] (5) Connect the front cylinder 1 to one end of the new tail pipe through the thread on the front cylinder 1, and tighten the fixing bolt 6 again;

[0062] (6) Tighten the fastening fixture by screwing the wrench on the through hole 2 of the rear cylinder, drive the new tail tube to rotate, so that the other end of the new tail tube is screwed into the thread of other equipment, and fasten the new tail tube to other equipment.

[0063] (7) Loosen the fixing bolt 6 to release the pressure applied to the new tail tube by the limiting slide 3, thereby reducing the friction between the new tail tube and the front cylinder; tighten the fastening fixture with a wrench, keep the tail tube stationary while the fastening fixture rotates, thereby removing the fastening fixture from the new tail tube and completing the replacement of the tail tube.

[0064] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A fastening fixture for preventing the tailpipe thread from rotating during the maintenance of a split nozzle, characterized in that... include: Front cylinder (1), rear cylinder (2), limiting slide (3), support ring seat (4), screw (5) and fixing bolt (6); The front cylinder (1), rear cylinder (2), limiting slide (3), and support ring seat (4) are all cylindrical structures with open ends; the inner cylindrical surface of one end of the front cylinder (1) is threaded for fastening the tail tube; the support ring seat (4) is coaxially fixed to the other end of the front cylinder (1) by screws (5), part of which is located inside the front cylinder (1), and its outer cylindrical surface is tightly fitted with the inner cylindrical surface of the front cylinder (1), while the other part is exposed; the limiting slide (3) is located inside the front cylinder (1), and its outer cylindrical surface is tightly fitted with the inner cylindrical surface of the front cylinder (1); the limiting slide (3) is located between the thread on the front cylinder (1) and the support ring seat (4); One end of the rear cylinder (2) is coaxially sleeved on the cylindrical section of the support ring seat (4) exposed from the front cylinder (1). The rear cylinder (2) and the support ring seat (4) are welded together by electron beam welding. The other end of the rear cylinder (2) is provided with multiple through holes in the circumferential direction for installing wrenches. The support ring seat (4) is provided with multiple threaded through holes in the circumferential direction on the end face. Each threaded through hole is opened along the length direction of the support ring seat (4). The fixing bolt (6) is screwed into the threaded through hole from one end of the support ring seat (4) that is in contact with the rear cylinder (2), and the end of the bolt passes out from the other end of the support ring seat (4). When fastening the tail tube, tighten the fixing bolt (6) to apply axial pressure to the tail tube by the limiting slide (3) to complete the tail tube fastening; when removing the fastening fixture from the tail tube, loosen the fixing bolt (6) to release the axial pressure applied to the tail tube by the limiting slide (3) to prevent the tail tube from rotating when removing the fixture.

2. The fastening fixture for preventing tailpipe thread rotation during the maintenance of a split nozzle as described in claim 1, characterized in that: After screwing the tail tube into the thread of the front cylinder (1), tighten the fixing bolt (6). The part of the fixing bolt (6) that passes through the support ring seat (4) abuts against the end face of one end of the limiting slide cylinder (3), and the other end of the limiting slide cylinder (3) abuts against the tail tube. The limiting slide cylinder (3) cannot slide inside the front cylinder (1). At this time, the limiting slide cylinder (3) applies axial pressure to the tail tube, thereby increasing the friction between the tail tube and the front cylinder (1). When the tail tube is rotated by tightening the fastening fixture, the tail tube will not move axially inside the front cylinder (1), which facilitates the installation of the tail tube.

3. The fastening fixture for preventing tailpipe thread rotation during the maintenance of a split nozzle as described in claim 1, characterized in that: When the tailpipe is installed and the fastening fixture is removed from the tailpipe, the fixing bolt (6) is loosened. The part of the fixing bolt (6) that passes through the support ring seat (4) no longer applies axial pressure to the limiting slide (3). At this time, the limiting slide (3) slides in the front cylinder (1), which releases the axial pressure applied to the tailpipe, thereby reducing the friction between the tailpipe and the front cylinder (1). This ensures that when the fastening fixture is tightened to remove the tailpipe from the tailpipe, the tailpipe will not rotate with the fastening fixture.

4. The fastening fixture for preventing tailpipe thread rotation during the maintenance of a split nozzle as described in claim 1, characterized in that: The front cylinder (1) is provided with a sawtooth thread with a nominal diameter of 127 mm and a pitch of 2 mm.

5. A fastening fixture for preventing the tailpipe thread from rotating during the maintenance of a split nozzle, as described in claim 1, is characterized in that: The rear cylinder (2) has four through holes in its circumference, and the diameter of each through hole is 27 mm.

6. The fastening fixture for preventing tailpipe thread rotation during the maintenance of a split nozzle as described in claim 1, characterized in that: The inner diameter of the limiting slide (3) is designed in a stepped manner. The inner diameter of the end of the limiting slide (3) near the thread on the front cylinder (1) is 60mm, and the inner diameter of the end near the support ring seat (4) is 115mm.

7. The fastening fixture for preventing tailpipe thread rotation during the maintenance of a split nozzle as described in claim 1, characterized in that: The inner diameter of the support ring seat (4) is 66mm, and the support ring seat (4) has 8 threaded through holes of type M12.

8. A fastening fixture for preventing the tailpipe thread from rotating during the maintenance of a split nozzle according to any one of claims 1-7, characterized in that: The specific process for replacing the damaged tailpipe on the combustion chamber housing using fastening tools is as follows: Step 1: Connect the front cylinder (1) to the damaged tail pipe that needs to be replaced through the thread on the front cylinder (1), and at the same time install a wrench on the through hole of the rear cylinder (2); The second step is to tighten the fixing bolt (6) so that the fixing bolt (6) abuts against the end face of one end of the limiting slide cylinder (3), and at the same time, the end face of the other end of the limiting slide cylinder (3) abuts against the tail pipe. At this time, the limiting slide cylinder (3) applies axial pressure to the tail pipe, increasing the friction between the tail pipe and the front cylinder (1). Step 3: Tighten the fastening fixture with a wrench to rotate the damaged tailpipe, thereby removing the tailpipe from the combustion chamber housing; Step 4: Loosen the fixing bolt (6) to release the pressure exerted by the limiting slide (3) on the damaged tail pipe; By tightening the fastening fixture with a wrench, while keeping the tail tube stationary, the fastening fixture rotates, thereby removing the fastening fixture from the damaged tail tube. Step 5: Connect the front cylinder (1) to one end of the new tailpipe through the thread on the front cylinder (1), and tighten the fixing bolt (6) again. Step 6: Tighten the fastening fixture by using the installation wrench on the through hole of the rear cylinder (2) to drive the new tailpipe to rotate, so that the other end of the new tailpipe is screwed into the thread on the combustion chamber shell, and the new tailpipe is fastened to the combustion chamber shell. Step 7: Loosen the fixing bolt (6) to release the pressure exerted by the limiting slide (3) on the new tail pipe, thereby reducing the friction between the new tail pipe and the front cylinder. By tightening the fastening fixture with a wrench, while keeping the tail tube stationary, the fastening fixture rotates, thereby removing the fastening fixture from the new tail tube and completing the tail tube replacement.

9. A method for replacing a tailpipe to prevent thread rotation, characterized in that: This method is implemented using the anti-tail pipe thread and rotation fastening fixture described in any one of claims 1-7, and the specific steps are as follows: Step 1: Connect the fastening fixture to the damaged tail tube that needs to be replaced by threading the thread on the front cylinder (1) of the anti-tail tube thread and the fastening fixture, and install a wrench on the through hole of the rear cylinder (2). The second step is to tighten the fixing bolt (6) so that the fixing bolt (6) abuts against the end face of one end of the limiting slide cylinder (3), and at the same time, the end face of the other end of the limiting slide cylinder (3) abuts against the tail pipe. At this time, the limiting slide cylinder (3) applies axial pressure to the tail pipe, increasing the friction between the tail pipe and the front cylinder (1). Step 3: Tighten the fastening fixture with a wrench to rotate the damaged tailpipe, thereby removing the tailpipe from other equipment; Step 4: Loosen the fixing bolt (6) to release the pressure exerted by the limiting slide (3) on the damaged tail pipe; By tightening the fastening fixture with a wrench, while keeping the tail tube stationary, the fastening fixture rotates, thereby removing the fastening fixture from the damaged tail tube. Step 5: Connect the front cylinder (1) to one end of the new tailpipe through the thread on the front cylinder (1), and tighten the fixing bolt (6) again. Step 6: Tighten the fastening fixture by using the wrench on the through hole of the rear cylinder (2) to drive the new tail tube to rotate, so that the other end of the new tail tube is screwed into the thread on other equipment, and the new tail tube is fastened to other equipment. Step 7: Loosen the fixing bolt (6) to release the pressure exerted by the limiting slide (3) on the new tail pipe, thereby reducing the friction between the new tail pipe and the front cylinder. By tightening the fastening fixture with a wrench, while keeping the tail tube stationary, the fastening fixture rotates, thereby removing the fastening fixture from the new tail tube and completing the tail tube replacement.

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