Double-wall pipe fixing device and installation method

Abstract

This invention discloses a double-walled pipe fixing device, comprising a clamping ring assembly, several inner clamping ring adjustment groups, and several outer ring adjustment groups. The inner clamping ring of the clamping ring assembly covers the inner tube of the double-walled pipe, and the S-shaped outer clamping ring of the clamping ring assembly is embedded inside the outer tube of the double-walled pipe. An arc-shaped rubber gasket covers and fixes the upper and lower ends of the S-shaped outer clamping ring. One end of each inner clamping ring adjustment group abuts against the outer circular surface of the inner tube of the double-walled pipe, and the middle part is fixed to the inner clamping ring. One end of each outer ring adjustment group passes through the S-shaped outer clamping ring and abuts against the inner circle of the outer tube of the double-walled pipe, and the other end is fixed to the outer circle of the inner clamping ring. The installation method of this invention includes: 1) installing several inner clamping ring adjustment groups, 2) installing the clamping ring assembly, 3) installing the outer ring adjustment groups, and 4) adjusting the inner clamping ring adjustment groups and the outer ring adjustment groups. This invention has low manufacturing cost. It is very convenient to install, disassemble, and adjust. It is applicable to double-walled pipes of various specifications, has good versatility, and facilitates on-site installation and disassembly, improving work efficiency.

Description

Technical Field

[0001] The invention relates to a fixing device for a natural gas transmission pipeline, in particular to a fixing device and an installation method for a natural gas transmission double-wall pipeline of a marine dual-fuel engine, belonging to the technical field of dual-fuel engines. Background Art

[0002] Clean gas fuels represented by natural gas are increasingly widely used in marine dual-fuel engines. Natural gas is a hazardous gas. Classification societies have explicitly required that all natural gas transmission pipelines arranged in the cabin must use double-walled pipes, with the inner tube used for transmitting natural gas and the outer cavity used for ventilation or filled with inert gas with a pressure higher than the gas pressure in the inner tube to avoid the risk of natural gas leakage.

[0003] The existing double-wall pipe fixing device can only be used for double-wall pipes of one specification and is not universal. At the same time, due to manufacturing errors and assembly errors of parts, the fixing device is difficult to install and disassemble. In serious cases, it must be scrapped and reprocessed, which seriously affects the production progress and increases the manufacturing cost. Summary of the invention

[0004] The purpose of the present invention is to provide a double-wall pipe fixing device and an installation method which are convenient to assemble and disassemble, applicable to several double-wall pipes and have good versatility.

[0005] The present invention is achieved through the following technical solutions:

[0006] A double-walled tube fixing device comprises a clamping ring assembly, an array of inner clamping ring adjustment groups and an array of outer ring adjustment groups, the ear plates on both sides of the clamping ring assembly are respectively fixedly connected by bolts and nuts to form a combination structure with an inner clamping ring and an S-shaped outer clamping ring, the array of inner clamping ring adjustment groups are evenly distributed between the inner circular surface of the inner clamping ring and the outer circular surface of the inner tube of the double-walled tube, and the array of outer ring adjustment groups are evenly distributed between the outer circular surface of the inner clamping ring and the inner circular surface of the outer tube of the double-walled tube; the inner clamping ring covers the inner tube of the double-walled tube, the S-shaped outer clamping ring is embedded in the outer tube of the double-walled tube, and the arc-shaped rubber liner is covered and fixed on the upper and lower ends of the S-shaped outer clamping ring; one end of the inner clamping ring adjustment group respectively abuts against the outer circular surface of the inner tube of the double-walled tube, the middle part of the inner clamping ring adjustment group is fixed on the inner clamping ring, one end of the outer ring adjustment group respectively passes through the S-shaped outer clamping ring and abuts against the inner circle of the outer tube of the double-walled tube, and the other end of the outer ring adjustment group is fixed on the outer circle of the inner clamping ring.

[0007] The purpose of the present invention can be further achieved by the following technical measures.

[0008] Furthermore, the inner clamping ring adjustment group includes an inner stud, a flat rubber gasket, a spring and a butterfly nut. One end of the inner stud passes through the inner clamping ring and is fixedly connected to the center of one side of the bottom plate of the flat rubber gasket. The spring is sleeved on one end of the inner stud and is located between one side of the rubber gasket and the inner circular surface of the inner clamping ring. The butterfly nut is screwed on the middle part of the inner stud and rests on the outer circular surface of the inner clamping ring. The rubber plates of the rubber gasket rest on the outer circle of the inner tube of the double-walled tube respectively.

[0009] Furthermore, the outer ring adjustment group includes a base nut, an outer stud, a rotating nut, an inner retaining ring and an outer retaining ring. One end of the base nut is welded and fixed on two opposite sides of the outer circumferential surface of the inner clamping ring; the rotating nut is welded and fixed on the middle of the outer stud, one end of the outer stud is screwed into and fixed in the base nut, and the other end of the outer stud passes through the waist-shaped hole at the corresponding position of the S-shaped outer clamping ring, and is fixed on the S-shaped outer clamping ring through the inner retaining ring and the outer retaining ring clamped on both sides of the waist-shaped hole. The center of the base nut is connected to the air vent that passes through the S-shaped outer clamping ring.

[0010] Furthermore, the outer retaining ring is a shaft retaining ring, and the two opposite sides of the inner retaining ring respectively extend outward with wing plates, one of which is an integral structure, and the other is an elastic structure that is longitudinally split into two halves and crosses through the expansion hole, the expansion hole is connected to the center hole of the inner retaining ring and the diameter of the expansion hole is smaller than the diameter of the center hole of the inner retaining ring; the end face spacing A of the two wing plates is greater than the width B of the waist-shaped hole.

[0011] A method for installing a double-wall pipe fixing device comprises the following steps:

[0012] 1) Install several inner clamp ring adjustment groups. First, select inner clamp rings, array inner studs and springs of corresponding specifications according to the outer diameter of the inner tube of the double-walled tube and the inner diameter of the outer tube of the double-walled tube. Then, vertically fix the center of one side of the bottom plate of the flat rubber gasket with one end of the corresponding inner stud. Then, insert the spring into one end of the inner stud. Then, pass the other end of the inner stud through the corresponding inner clamp ring circular hole. Finally, rotate the butterfly nut from the other end of the inner stud to the middle of the inner stud, so that the butterfly nut abuts against the outer circle of the inner clamp ring, and the spring is located between one side of the rubber gasket and the inner circle of the inner clamp ring. Use the same method to complete the installation of several inner clamp ring adjustment groups in sequence.

[0013] 2) Install the clamping ring assembly, put the inner clamping ring of the installed inner clamping ring adjustment group on the outer circle of the inner tube of the double-walled tube, and make the lower end surface of the inner clamping ring higher than the upper end surface of the outer tube of the double-walled tube, and rotate the butterfly nuts respectively, so that the springs push the outer side surfaces of the corresponding rubber gaskets against the outer circle of the inner tube of the double-walled tube, ensuring that the clamping ring assembly will not move freely or slip off;

[0014] 3) Install the outer ring adjustment group. First, use a conical punch to punch into the expanded hole to open the inner retaining ring, so that the inner retaining ring can be installed in the middle of the corresponding outer stud. Then, the lower ends of the outer studs are respectively passed through the waist-shaped holes of the S-shaped outer clamp ring and screwed into the base nuts. Make the wing plates on both sides of the outer retaining ring parallel to the length direction of the waist-shaped holes, and ensure that the wing plates pass through the waist-shaped holes; then, wrap and fix the arc-shaped rubber gaskets on the arc-shaped edges of the S-shaped outer clamp ring, and ensure that the arc-shaped rubber gasket notches are respectively inserted into the corresponding arc-shaped edges. The end ports are flush with the end faces of the corresponding arc-shaped edges, and the gasket countersunk holes just pass through the corresponding outer stud heads; rotate the rotating nuts respectively, and squeeze the corresponding arc-shaped rubber gaskets manually at the same time, so that the corresponding outer stud heads extend out of the gasket countersunk holes, and then fix the outer retaining ring on the corresponding outer stud heads; continue to rotate the corresponding rotating nuts until the inner retaining ring is higher than the inner side of the corresponding waist-shaped hole, and adjust the positions of the inner retaining rings respectively, so that the wing plates at both ends of the inner retaining rings are perpendicular to the waist-shaped holes, and the installation of the outer ring adjustment group is completed;

[0015] 4) Adjust the inner clamp ring adjustment group and the outer ring adjustment group, rotate the rotating nuts of the outer ring adjustment group respectively, until the outer ring adjustment group can easily pass through the waist-shaped hole at the corresponding position of the S-shaped outer clamp ring, then loosen the nuts on the ear plates respectively and tighten the butterfly nuts of the inner ring adjustment group respectively, so that the clamp ring assembly slowly slides down until the upper end surface of the arc-shaped rubber gasket is lower than the end surface of the outer tube of the double-walled tube, and then tighten the nuts on the ear plates; further cross-adjust several butterfly nuts to make the flat rubber gasket fit tightly on the outer cylindrical surface of the inner tube of the double-walled tube, and finally loosen the rotating nuts to make the arc-shaped rubber gasket fit tightly on the inner cylindrical surface of the outer tube of the double-walled tube, and complete the adjustment of the inner clamp ring adjustment group and the outer ring adjustment group.

[0016] Furthermore, in the step 4), the upper end surface of the flat rubber liner is 18 mm to 23 mm lower than the end surface of the outer tube of the double-walled tube.

[0017] The present invention adopts an array of inner clamp ring adjustment groups evenly distributed between the inner circular surface of the inner clamp ring of the clamp ring assembly and the outer circular surface of the inner tube of the double-walled tube, and an array of outer ring adjustment groups evenly distributed between the outer circular surface of the inner clamp ring and the inner circular surface of the outer tube of the double-walled tube to fix the inner tube and the outer tube of the double-walled tube. The structure is compact and the manufacturing cost is low. The assembly, disassembly and adjustment are very convenient. It is suitable for double-walled tubes of various specifications, has good versatility, and can be easily assembled and disassembled on site, thereby improving work efficiency.

[0018] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention installed in a double-walled pipe;

[0020] Figure 2It is a three-dimensional structural diagram of the present invention;

[0021] Figure 3 yes Figure 2 AA section enlarged view;

[0022] Figure 4 yes Figure 2 BB cross-section enlarged view;

[0023] Figure 5 This is an enlarged structural diagram of the inner retaining ring. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] In the description of the present invention, terms indicating orientation or position such as "upper", "lower", "inner" and "outer" are based on the orientation shown in the drawings and are only for simplifying the description, and do not indicate or imply that the present invention must have a specific orientation or position.

[0026] like Figure 1 to Figure 4 As shown, this embodiment is used to fix a double-walled tube with an outer diameter of D=114mm and an inner diameter of d=56mm. The present invention can be used to fix double-walled tubes with outer diameters of D≤220mm and inner diameters of d≤100mm of various specifications. This embodiment includes a clamping ring assembly 1, and the ear plates 111 on both sides of the clamping ring assembly 1 are respectively fixedly connected by bolts 2 and nuts 3 to form a combination structure having an inner clamping ring 11 and an S-shaped outer clamping ring 12. It also includes 4 groups of inner clamping ring adjustment groups 4 evenly distributed between the inner circular surface of the inner clamping ring 11 and the outer circular surface of the double-walled tube inner tube 10, and 2 groups of outer ring adjustment groups 5 evenly distributed between the outer circular surface of the inner clamping ring 10 and the inner circular surface of the double-walled tube outer tube 20. The inner clamping ring 11 covers the double-walled tube inner tube 10, and the S-shaped outer clamping ring 12 is embedded in the double-walled tube outer tube 20. The arc-shaped rubber gasket 121 covers and is fixed on the upper and lower ends of the S-shaped outer clamping ring 12. One end of the inner clamp ring adjustment group 4 rests on the outer circumference of the double-walled tube inner tube 10, the middle part of the inner clamp ring adjustment group 4 is fixed on the inner clamp ring 11, one end of the outer ring adjustment group 5 passes through the S-shaped outer clamp ring 12 and rests on the inner circle of the double-walled tube outer tube 20, and the other end of the outer ring adjustment group 5 is fixed on the outer circle of the inner clamp ring 11.

[0027] The inner clamp ring adjustment group 4 includes an inner stud 41, a flat rubber gasket 42, a spring 43 and a butterfly nut 44. One end of the inner stud 41 passes through the inner clamp ring 11 and is fixedly connected to the center of one side of the bottom plate 421 of the flat rubber gasket 42. The spring 43 is sleeved on one end of the inner stud 41 and is located between one side of the rubber gasket 42 and the inner circumference of the inner clamp ring 11. The butterfly nut 44 is screwed on the middle part of the inner stud 41 and abuts against the outer circumference of the inner clamp ring 11. The rubber plate 422 of the rubber gasket 42 abuts against the outer circumference of the inner tube 10 of the double-walled tube.

[0028] The outer ring adjustment group 5 includes a base nut 51, an outer stud 52, a rotating nut 53, an inner retaining ring 54 and an outer retaining ring 55. One end of the base nut 51 is welded and fixed on two opposite sides of the outer circumference of the inner clamping ring 11. The rotating nut 53 is welded and fixed on the middle part of the outer stud 52. One end of the outer stud 52 is screwed into and fixed in the base nut 51, and the other end passes through the waist-shaped hole 122 at the corresponding position of the S-shaped outer clamping ring 12, and is fixed to the S-shaped outer clamping ring 12 by the inner retaining ring 54 and the outer retaining ring 55 clamped on both sides of the waist-shaped hole 122. In order to avoid the formation of a closed space that makes it difficult to screw in or out the outer stud 52, the center of the base nut 51 is connected to the air vent 123 that passes through the S-shaped outer clamping ring 12. The S-shaped outer clamp ring 12 and the arc-shaped rubber gasket 121 can move together with the outer stud 52 to achieve fine adjustment of the diameter of the S-shaped outer clamp ring 12 and make the arc-shaped rubber gasket 121 tight on the inner circular surface of the double-walled tube outer tube 20. The arc-shaped rubber gasket 121 is used to protect the double-walled tube outer tube 20 and also plays a certain vibration reduction role.

[0029] The outer retaining ring 55 is a shaft retaining ring, such as Figure 5 As shown, two opposite sides of the inner retaining ring 54 extend wing plates 541 outward respectively, one of which is an integral structure, and the other is an elastic structure that is longitudinally split into two halves and crosses the expansion hole 542, and the expansion hole 542 is connected to the center hole 543 of the inner retaining ring, and the diameter of the expansion hole 542 is smaller than the diameter of the center hole 543 of the inner retaining ring. The end surface spacing A of the two wing plates 541 is greater than the width B of the waist-shaped hole 122, so that the outer stud 52 can be axially positioned on the arc-shaped rubber gasket 121, and can move slightly when the arc-shaped rubber gasket 121 is elastically deformed, so as to achieve a better fixing effect on the double-walled outer tube 20.

[0030] A method for installing a double-wall pipe fixing device comprises the following steps:

[0031] 1) Install 4 inner clamp ring adjustment groups 4. First, select inner clamp rings 11, 4 groups of inner studs 41 and springs 43 of corresponding specifications according to the outer diameter of the double-walled tube inner tube 10 and the inner diameter of the double-walled tube outer tube 20. Then, vertically fix the center of one side of the bottom plate 421 of the flat rubber gasket 42 with one end of the corresponding inner stud 41. Then, insert the spring 43 into one end of the inner stud 41. Then, pass the other end of the inner stud 41 through the corresponding inner clamp ring circular hole 112. Finally, rotate the butterfly nut 44 from the other end of the inner stud 41 to the middle of the inner stud 41, so that the butterfly nut 44 rests on the outer circle of the inner clamp ring 11, and the spring 43 is located between one side of the rubber gasket 42 and the inner circle of the inner clamp ring 11. Use the same method to complete the installation of the remaining 3 inner clamp ring adjustment groups 4 in sequence.

[0032] 2) Install the clamping ring assembly 1, and put the inner clamping ring 11 with 4 inner clamping ring adjustment groups 4 installed on the outer circle of the double-walled tube inner tube 10, and make the lower end surface of the inner clamping ring 11 higher than the upper end surface of the double-walled tube outer tube 20, and rotate the butterfly nuts 44 respectively, so that the springs 43 push the corresponding outer side surfaces of the rubber gaskets 42 against the outer circle of the double-walled tube inner tube 10, and the rubber gaskets 42 ensure that the clamping ring assembly will not move freely or slip.

[0033] 3) Install the outer ring adjustment group 5. First, use a conical punch to punch into the expanded hole to open the inner retaining ring 54, so that the inner retaining ring 54 can be installed in the middle of the corresponding outer stud 52. Then, the lower ends of the outer studs 52 are respectively passed through the waist-shaped holes 122 of the S-shaped outer clamping ring 12 and screwed into the base nut 51, so that the wing plates 541 on both sides of the inner retaining ring 54 are parallel to the length direction of the waist-shaped holes 122, and ensure that the wing plates 541 pass through the waist-shaped holes 122. Then, the arc-shaped rubber gaskets 121 are respectively covered and fixed on the arc-shaped edges of the S-shaped outer clamping ring 12, and ensure that the grooves of the arc-shaped rubber gaskets 121 are respectively inserted into the corresponding arc-shaped edges, and the ports at one end of the arc-shaped rubber gaskets 121 are respectively flush with the end faces of the corresponding arc-shaped edges, and the gasket countersunk holes 1211 just pass through the heads of the corresponding outer studs 52. Rotate the rotating nut 53 respectively, and squeeze the corresponding arc-shaped rubber gasket 121 manually at the same time, so that the head of the corresponding outer stud 52 extends out of the gasket countersunk hole 1211, and then fix the outer retaining ring 55 on the head of the corresponding outer stud 52. Continue to rotate the corresponding rotating nut 53 until the inner retaining ring 54 is higher than the inner side of the corresponding waist-shaped hole 122, and adjust the position of the inner retaining ring 54 respectively, so that the wing plates 541 at both ends of the inner retaining ring 54 are respectively perpendicular to the waist-shaped hole 122, and complete the installation of the outer ring adjustment group 5.

[0034] 4) Adjust the inner clamp ring adjustment group 4 and the outer ring adjustment group 5, respectively rotate the rotating nut 53 of the outer ring adjustment group 5 until the outer ring adjustment group 5 can easily pass through the inner hole of the double-walled tube outer tube 20, then loosen the nut 3 on the ear plate 111 and tighten the butterfly nut 44 of the inner ring adjustment group 4 until the outer ring adjustment group 5 can easily pass through the inner hole of the double-walled tube outer tube 20, so that the clamp ring assembly 1 slowly slides down until the upper end surface of the arc-shaped rubber gasket 121 is 18mm to 23mm lower than the end surface of the double-walled tube outer tube 20, and then tighten the nut 3 on the ear plate 111. Further cross-adjust the four butterfly nuts 44 to make the flat rubber gasket 121 fit tightly on the outer circumferential surface of the double-walled tube inner tube 10, and finally loosen the rotating nut 53 to make the arc-shaped rubber gasket 422 fit tightly on the inner circumferential surface of the double-walled tube outer tube 20, and complete the adjustment of the inner clamp ring adjustment group 4 and the outer ring adjustment group 5.

[0035] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A double-walled pipe fixing device, comprising a clamping ring assembly, wherein the ear plates on both sides of the clamping ring assembly are respectively fixedly connected by bolts and nuts to form a combination structure having an inner clamping ring and an S-shaped outer clamping ring, wherein the inner clamping ring covers the inner tube of the double-walled pipe, the S-shaped outer clamping ring is embedded in the outer tube of the double-walled pipe, and an arc-shaped rubber liner is covered and fixed on the upper and lower ends of the S-shaped outer clamping ring; characterized in that: It also includes an array of inner clamp ring adjustment groups and an array of outer ring adjustment groups, wherein the array of inner clamp ring adjustment groups are evenly distributed between the inner circular surface of the inner clamp ring and the outer circular surface of the inner tube of the double-walled tube, and the array of outer ring adjustment groups are evenly distributed between the outer circular surface of the inner clamp ring and the inner circular surface of the outer tube of the double-walled tube; one end of the inner clamp ring adjustment group respectively abuts against the outer circular surface of the inner tube of the double-walled tube, the middle part of the inner clamp ring adjustment group is fixed on the inner clamp ring, one end of the array of inner clamp ring adjustment groups respectively passes through the S-shaped outer clamp ring and abuts against the inner circle of the outer tube of the double-walled tube, and the other end of the outer ring adjustment group is fixed on the outer circle of the inner clamp ring; The inner clamp ring adjustment group includes an inner stud, a flat rubber gasket, a spring and a butterfly nut. One end of the inner stud passes through the inner clamp ring and is fixedly connected to the center of one side of the bottom plate of the flat rubber gasket. The spring is sleeved on one end of the inner stud and is located between one side of the rubber gasket and the inner circular surface of the inner clamp ring. The butterfly nut is screwed on the middle part of the inner stud and abuts against the outer circular surface of the inner clamp ring. The rubber plates of the rubber gasket abut against the outer circle of the inner tube of the double-walled tube respectively. The outer ring adjustment group includes a base nut, an outer stud, a rotating nut, an inner retaining ring and an outer retaining ring. One end of the base nut is respectively welded and fixed on two opposite sides of the outer circumferential surface of the inner clamping ring; the rotating nut is welded and fixed on the middle part of the outer stud, one end of the outer stud is screwed into and fixed in the base nut, and the other end of the outer stud passes through the waist-shaped hole at the corresponding position of the S-shaped outer clamping ring, and is respectively fixed on the S-shaped outer clamping ring through the inner retaining ring and the outer retaining ring clamped on both sides of the waist-shaped hole; The center of the base nut is connected to the air vent that passes through the S-shaped outer clamp ring; The outer retaining ring is a shaft retaining ring, and wing plates are extended outward from two opposite sides of the inner retaining ring, one of which is an integral structure, and the other is an elastic structure that is longitudinally split into two halves and crosses through the expansion hole. The expansion hole is connected to the center hole of the inner retaining ring and the diameter of the expansion hole is smaller than the diameter of the center hole of the inner retaining ring; the end face spacing A of the two wing plates is greater than the width B of the waist-shaped hole.

2. A method for installing the double-walled pipe fixing device according to claim 1, characterized in that: The following steps are involved: 1) Install several inner clamp ring adjustment groups. First, select inner clamp rings, array inner studs and springs of corresponding specifications according to the outer diameter of the inner tube of the double-walled tube and the inner diameter of the outer tube of the double-walled tube. Then, vertically fix the center of one side of the bottom plate of the flat rubber gasket with one end of the corresponding inner stud. Then, insert the spring into one end of the inner stud. Then, pass the other end of the inner stud through the corresponding inner clamp ring circular hole. Finally, rotate the butterfly nut from the other end of the inner stud to the middle of the inner stud, so that the butterfly nut abuts against the outer circle of the inner clamp ring, and the spring is located between one side of the rubber gasket and the inner circle of the inner clamp ring. Use the same method to complete the installation of several inner clamp ring adjustment groups in sequence. 2) Install the clamping ring assembly, put the inner clamping ring of the installed inner clamping ring adjustment group on the outer circle of the inner tube of the double-walled tube, and make the lower end surface of the inner clamping ring higher than the upper end surface of the outer tube of the double-walled tube, and rotate the butterfly nuts respectively, so that the springs push the outer side surfaces of the corresponding rubber gaskets against the outer circle of the inner tube of the double-walled tube, ensuring that the clamping ring assembly will not move freely or slip off; 3) Install the outer ring adjustment group. First, use a conical punch to punch into the expanded hole to open the inner retaining ring, so that the inner retaining ring can be installed in the middle of the corresponding outer stud. Then, the lower end of the outer stud is screwed into the base nut through the waist-shaped hole of the S-shaped outer clamp ring, so that the wing plates on both sides of the outer retaining ring are parallel to the length direction of the waist-shaped hole, and ensure that the wing plates pass through the waist-shaped hole; then, the arc-shaped rubber gaskets are respectively covered and fixed on the arc-shaped edges of the S-shaped outer clamp ring, ensuring that the arc-shaped rubber gasket notches are respectively inserted into the corresponding arc-shaped edges, and the ports at one end of the arc-shaped rubber gaskets are respectively flush with the end faces of one end of the corresponding arc-shaped edges, and the gasket countersunk holes just pass through the corresponding outer stud heads; Turn the rotating nuts respectively and squeeze the corresponding arc-shaped rubber gaskets manually at the same time to make the corresponding outer stud heads extend out of the gasket countersunk holes, and then fix the outer retaining ring on the corresponding outer stud heads; continue to rotate the corresponding rotating nuts until the inner retaining ring is higher than the inner side of the corresponding waist-shaped hole, and adjust the positions of the inner retaining rings respectively so that the wing plates at both ends of the inner retaining rings are perpendicular to the waist-shaped holes, and complete the installation of the outer ring adjustment group; 4) Adjust the inner clamp ring adjustment group and the outer ring adjustment group, rotate the rotating nuts of the outer ring adjustment group respectively, until the outer ring adjustment group can easily pass through the waist-shaped hole at the corresponding position of the S-shaped outer clamp ring, then loosen the nuts on the ear plates and tighten the butterfly nuts of the inner ring adjustment group respectively, so that the clamp ring assembly slowly slides down until the upper end surface of the arc-shaped rubber gasket is lower than the end surface of the outer tube of the double-walled tube, and then tighten the nuts on the ear plates; further cross-adjust several butterfly nuts to make the flat rubber gasket fit tightly on the outer cylindrical surface of the inner tube of the double-walled tube, and finally loosen the rotating nuts to make the arc-shaped rubber gasket fit tightly on the inner cylindrical surface of the outer tube of the double-walled tube, completing the adjustment of the inner clamp ring adjustment group and the outer ring adjustment group.

3. The installation method of the double-wall pipe fixing device according to claim 2, characterized in that: In the step 4), the upper end surface of the plane rubber liner is 18 mm to 23 mm lower than the end surface of the outer tube of the double-wall tube.

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