Telescopic argon filling device and method

Abstract

The invention provides a telescopic argon filling device and method. The device comprises a tail taper sleeve, a telescopic taper sleeve, a head taper sleeve, a heavy hammer, an argon inlet and an argon outlet, the tail cone sleeve comprises a tail cone body, a tail cone base is arranged at the large-caliber end, and a shaft sleeve is arranged in the middle of the tail cone base. The argon inlet is formed in the outer side of the tail cone base; the outer conical surface of the large-caliber end of the cone and the inner conical surface of the small-caliber end of the tail cone are sealed through conical surface fit; the large-caliber end of the cone is provided with a circular ring catch; the outer conical surface of the large-caliber end of the head taper sleeve and the inner conical surface of the small-caliber end of the cone are matched through conical surfaces to achieve sealing, and the large-caliber end of the head taper sleeve is limited through a circular ring blocking piece; the heavy hammer comprises a hammer rod, a hammer head is arranged at the front end, and a hammer handle is arranged at the tail end; the argon outlet is a through hole formed in the hammer head and is used for conveying argon into the pipeline; the sealing sleeve is arranged on the shaft sleeve and used for dynamic sealing between the heavy hammer and the tail taper sleeve.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline welding, in particular to a telescopic argon filling device and method. BACKGROUND

[0002] In the process of pipeline welding of stainless steel, titanium alloy and nickel-based alloy materials, in order to prevent the back of the weld from being oxidized at high temperature, it is necessary to fill argon in the pipeline to isolate air and ensure the welding quality.

[0003] At present, the common argon filling sealing methods include the use of soluble paper, rubber air bag, flexible sealing blanket or conical sealing plug. These methods have obvious limitations: the soluble paper has poor sealing performance and can only be used once; the rubber air bag and the flexible sealing blanket are not resistant to high temperature and cannot be used in the area close to the weld, otherwise they will melt and be damaged due to high temperature, resulting in failure of protection; and the conical sealing plug is resistant to high temperature, but a plug of a certain specification can only be used for a pipeline of a specific diameter, so a complete set of plugs of different sizes need to be prepared on site, which occupies a large space, is inconvenient to use and is difficult to manage.

[0004] However, the present inventors found at least the following technical problems in the process of implementing the technical solutions in the embodiments of the present application: 1. Poor high temperature resistance: conventional rubber or plastic sealing elements cannot withstand close-range high temperature baking, especially when welding thin-walled pipes such as ultra-low carbon steel pipes, the entire welding area will turn red, and high temperature will cause the non-metallic sealing element to melt, fail and even contaminate the weld. At present, only solid or hollow metal cone plugs can be used to block the pipe opening, but this method has limited sealing effect and serious argon gas waste.

[0005] 2. Lack of versatility: in order to adapt to pipelines of different diameters, a series of sealing elements or cone plugs of different specifications need to be prepared, which is extremely inconvenient to manage, carry and use, has high cost and low efficiency.

[0006] 3. Difficult to remove: after welding, the pipeline is deformed by heat and is easily stuck with the internal sealing device. If forcibly pulled out, the device or the inner wall of the pipeline is easily damaged. SUMMARY

[0007] In order to solve the problems of poor high temperature sealing, lack of versatility and difficulty in removing of the argon filling device in the prior art, the embodiments of the present application provide a telescopic argon filling device and method. The method solves the technical problem of argon filling protection in pipeline welding by using a telescopic argon filling device made of all metal and having multiple levels of telescopic extension to adapt to different pipe diameters, and using the gravity inertia of a heavy hammer to remove it.

[0008] The solution adopted by the embodiments of the present application to solve the technical problems is as follows: A telescopic argon filling device comprises a tail cone sleeve, a telescopic cone sleeve, a head cone sleeve, a weight, an argon inlet, an argon outlet and a sealing sleeve; The tail cone sleeve comprises a tail cone body, one end of which is a small-diameter end and the other end is a large-diameter end, and a tail cone base is arranged at the large-diameter end, and a shaft sleeve is arranged in the middle of the tail cone base; the argon inlet is arranged outside the tail cone base for connecting an argon hose; the telescopic cone sleeve is nested in the tail cone sleeve and comprises a cone body, one end of which is a small-diameter end and the other end is a large-diameter end, and the outer cone surface of the large-diameter end of the cone body is sealed with the inner cone surface of the small-diameter end of the tail cone body through a cone surface fit; a circular ring stopper is arranged at the large-diameter end of the cone body; the head cone sleeve is nested in the telescopic cone sleeve, one end of which is a small-diameter end and the other end is a large-diameter end, and the outer cone surface of the large-diameter end of the head cone sleeve is sealed with the inner cone surface of the small-diameter end of the cone body through a cone surface fit, and the large-diameter end of the head cone sleeve is limited by the circular ring stopper; the weight comprises a hammer rod, which passes through the tail cone sleeve, the telescopic cone sleeve and the head cone sleeve in sequence, a hammer head is arranged at the front end of the hammer rod, and a hammer handle is arranged at the tail end of the hammer rod; the argon outlet is a through hole arranged on the hammer head for delivering argon into the pipeline; the sealing sleeve is arranged on the shaft sleeve for dynamic sealing between the weight and the tail cone sleeve; The tail cone sleeve, the telescopic cone sleeve and the head cone sleeve are nested and assembled in sequence, the outer diameter of the tail cone sleeve corresponds to the inner diameter of the pipeline as the outermost sealing surface, and the pipeline is blocked; when extended, the outer cone surface of the large-diameter end of the head cone sleeve is sealed and combined with the inner cone surface of the small-diameter end of the cone body, and the outer cone surface of the cone body is sealed and combined with the inner cone surface of the tail cone body; argon enters from the argon inlet, flows through the inner cavities of the tail cone sleeve, the telescopic cone sleeve and the head cone sleeve, and enters the inside of the pipeline to be filled with argon through the argon outlet; when retracted, the head cone sleeve and the telescopic cone sleeve are retracted into the tail cone sleeve through the hammering of the weight.

[0009] To further solve the technical problems to be solved by the embodiments of the present application, a telescopic argon filling method provided by the embodiments of the present application applies a telescopic argon filling device, comprising the following steps: Step 1: according to the inner diameter of the pipeline to be welded, the number of cone sleeves to be pulled out is preliminarily estimated, and a tail cone sleeve corresponding to the inner diameter of the pipeline is selected as the outermost sealing surface; the head cone sleeve and the telescopic cone sleeve are stretched and inserted into the inside of the pipeline until the conical outer wall of the tail cone sleeve is tightly combined with the inner wall of the pipeline to form a seal; Step 2: connect the argon hose to the argon inlet on the tail cone sleeve, open the argon, and the argon flows through the argon inlet into the inner cavities of the tail cone sleeve, the telescopic cone sleeve and the head cone sleeve, and then enters the inside of the pipeline to be filled with argon through the argon outlet, so as to discharge the air in the pipeline and protect the back of the weld; Step 3: adjust the argon flow to the required value and perform pipeline welding operation; Step 4, after the welding is completed, the argon is turned off, and the argon hose is disconnected; in general, the device is directly pulled out of the pipeline; if the device is stuck due to thermal deformation, the operator holds the tail cone sleeve with one hand and holds the hammer handle with the other hand, and knocks or pulls the heavy hammer back quickly, the hammer head of the heavy hammer hits the first cone sleeve, the first cone sleeve hits the annular baffle of the telescopic cone sleeve, and the impact force is transmitted in sequence, the first cone sleeve and the telescopic cone sleeve are shaken loose, the first cone sleeve and the telescopic cone sleeve are slightly displaced inward, and the first cone sleeve and the telescopic cone sleeve are separated from the inner wall of the pipeline, and then the device is easily taken out.

[0010] Step 5, after the device is taken out, the head of the first cone sleeve is pushed back to the tail cone sleeve, the telescopic cone sleeve will be retracted in sequence, and finally the first cone sleeve and the telescopic cone sleeve are stored in the tail cone sleeve, which is convenient for putting into the tool box for storage.

[0011] Positive effects: The technical scheme provided in the embodiments of the present application has at least the following technical effects or advantages: 1. Since the first cone sleeve 200, the telescopic cone sleeve 300 and the tail cone sleeve 100 are nested in sequence to form a multi-stage telescopic structure in the embodiments of the present application, a larger range of pipe diameters can be covered, multiple sizes of sealing elements do not need to be carried, work efficiency is improved, the device is small in size after contraction, storage space is saved, the technical problem of insufficient universality of the argon filling device in the prior art is effectively solved, and the technical effect of good universality and portability is achieved.

[0012] 2. Since the heavy hammer passes through the tail cone sleeve, the telescopic cone sleeve and the first cone sleeve in sequence in the embodiments of the present application, the hammer head hits the first cone sleeve, the first cone sleeve hits the annular baffle of the telescopic cone sleeve, and the impact force is transmitted in sequence, so that the first cone sleeve and the telescopic cone sleeve are separated from the inner wall of the pipeline, the technical problem of sticking caused by thermal deformation of the argon filling device in the prior art is effectively solved, the heavy hammer is knocked in the reverse direction, the mechanical impact force is transmitted internally, and the technical effect of easily taking out the argon filling device is achieved.

[0013] 3. Since the tail cone sleeve, the first cone sleeve, the telescopic cone sleeve, the heavy hammer, the argon inlet, the argon outlet and the sealing sleeve are made of metal material in the embodiments of the present application, the all-metal structure enables the device to be used close to the high-temperature weld, effectively solves the technical problem of poor high-temperature resistance of the argon filling device in the prior art, can directly withstand the high-temperature radiation of the welding area, can be kept at a very close distance from the weld, ensures the protection gas effect, has excellent high-temperature oxidation resistance, corrosion resistance and sufficient mechanical strength, and achieves the technical effects of high-temperature radiation resistance and thermal shock resistance.

[0014] 4. Since the application adopts the technical means that the outer conical surface of the large-diameter end of the cone body and the outer conical surface of the large-diameter end of the bow stem sleeve are provided with arc-shaped annular rings, the arc-shaped annular rings and the inner conical surface form a series of intermittent linear contact rings, which significantly reduces the contact area and forms a more reliable seal; effectively solves the technical problems of the sealing of the argon filling device in the prior art, and the arc-shaped annular ring serves as a buffer zone and a pressure equalization zone for the argon flow, so that the argon protective gas fills the pipeline more stably. Further, the technical effect of enhancing the sealing is achieved.

[0015] It is suitable to be applied as a telescopic argon filling device and method. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a southeast isometric view of the present embodiment; Figure 2 It is a southwest isometric view of the present embodiment; Figure 3 It is a 1 / 4 cut southwest isometric view of the present embodiment; Figure 4 It is a northwest isometric view of the present embodiment; Figure 5 It is a front view of the present embodiment; Figure 6 It is a right view of the present embodiment; Figure 7 It is a left view of the present embodiment; Figure 8 It is a schematic view of the base structure; Figure 9 It is a schematic view of the telescopic sleeve structure; Figure 10 It is a schematic view of the weight structure; Figure 11 It is a schematic view of the retracted state of the present embodiment.

[0018] In the figure, 100. tail cone sleeve, 110. tail cone body, 120. tail cone base, 130. shaft sleeve, 200. bow stem sleeve, 300. telescopic cone sleeve, 301. cone body, 302. annular baffle, 310. first telescopic sleeve, 320. second telescopic sleeve, 400. weight, 410. hammer rod, 420. hammer handle, 430. hammer head, 500. argon inlet, 600. argon outlet, 700. sealing sleeve. 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 some embodiments of the present invention, and not all embodiments. 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] According to the instruction manual Figures 1-11 As shown, a telescopic argon filling device includes a tail cone sleeve 100, a telescopic cone sleeve 300, a head cone sleeve 200, a counterweight 400, an argon inlet 500, an argon outlet 600, and a sealing sleeve 700. The tail cone sleeve 100 is a hollow variable cross section cone sleeve, including a tail cone 110. One end of the tail cone 110 is a small diameter end and the other end is a large diameter end. A tail cone base 120 is provided at the large diameter end to seal the tail cone 110. A bushing 130 is provided in the middle of the tail cone base 120. The argon inlet 500 is a standard threaded interface, located on the outside of the tail cone base 120, used to connect the argon hose and input protective gas; The telescopic cone sleeve 300 is also a hollow variable cross-section cone sleeve, nested in the tail cone sleeve 100. It includes a cone 301, one end of which is a small diameter end and the other end is a large diameter end. The outer cone surface of the large diameter end of the cone 301 and the inner cone surface of the small diameter end of the tail cone 110 are sealed by the cone surface fit. A circular baffle 302 is provided at the large diameter end of the cone 301 as a limiting point for the reverse action of the counterweight 400. The first cone sleeve 200 is also a hollow, variable cross-section multi-stage cone sleeve, nested in the telescopic cone sleeve 300. One end is the small diameter end, and the other end is the large diameter end. The outer cone surface of the large diameter end of the first cone sleeve 200 and the inner cone surface of the small diameter end of the cone 301 are sealed by the cone surface cooperation. The large diameter end of the first cone sleeve 200 is limited by the circular baffle 302. The hammer 400 includes a hammer rod 410, which passes through the tail cone sleeve 100, the telescopic cone sleeve 300, and the head cone sleeve 200 in sequence. A hammer head 430 is provided at the front end of the hammer rod 410, which is used to drive the head cone sleeve 200 to transmit the impact force step by step, so that the telescopic cone sleeve 300 retracts into the tail cone sleeve 100. A hammer handle 420 is provided at the tail end of the hammer rod 410, which is used to pull the hammer 400. Argon outlet 600 is a through hole set on hammer head 430, used to deliver argon gas into the pipeline; The sealing sleeve 700 is arranged on the shaft sleeve 130 to seal the hammer rod 410 of the heavy hammer 400 and the tail cone sleeve 100 to prevent leakage of argon; The first cone sleeve 200, the telescopic cone sleeve 300 and the tail cone sleeve 100 are sequentially nested and assembled, the outer diameter of the tail cone sleeve 100 corresponds to the inner diameter of the pipeline, and the tail cone sleeve 100 is used as the outermost sealing surface and blocks the pipeline; when extended, the large-diameter end outer conical surface of the first cone sleeve 200 is in sealing contact with the small-diameter end inner conical surface of the cone 301, and the outer conical surface of the cone 301 is in sealing contact with the inner conical surface of the tail cone 110, so as to form a continuous sealing channel, and the combination constitutes a rigid sealing body with adjustable length; argon enters from the argon inlet 500, flows through the inner cavities of the tail cone sleeve 100, the telescopic cone sleeve 300 and the first cone sleeve 200, and enters the inside of the pipeline to be filled with argon through the argon outlet 600; when retracted, the first cone sleeve 200 and the telescopic cone sleeve 300 are stored in the tail cone sleeve 100 through the hammering of the heavy hammer 400, so as to facilitate storage and carrying.

[0021] The technical solutions in the embodiments of the present application have at least the following technical effects or advantages: Since the first cone sleeve 200, the telescopic cone sleeve 300 and the tail cone sleeve 100 are sequentially nested to form a multi-stage telescopic structure, the device can cover a larger range of inner diameters of the pipeline, and it is not necessary to carry sealing members of multiple specifications, work efficiency is improved, the device has small volume after retraction, storage space is saved, and good universality and portability are achieved.

[0022] Since the heavy hammer 400 sequentially passes through the tail cone sleeve 100, the telescopic cone sleeve 300 and the first cone sleeve 200, when the device is stuck due to thermal deformation after pipeline welding is completed, the operator only needs to hold the hammer handle 420 and gently knock the heavy hammer 400 backward along the axial direction, the hammer head 430 of the heavy hammer 400 hits the first cone sleeve 200, the first cone sleeve 200 hits the annular baffle 302 of the telescopic cone sleeve 300, and the impact force is sequentially transmitted, so that the entire cone sleeve combination produces a slight inward displacement, so that the cone sleeve combination is separated from the inner wall of the pipeline, and then the device is easily taken out, therefore, the reverse knocking of the heavy hammer 400 transmits mechanical impact force through the inside, and the stuck problem caused by welding thermal deformation can be safely and effectively solved, the device and the pipeline are protected, operation is simple and labor-saving, and the device can be reliably taken out and stuck.

[0023] In order to ensure the stability of the structure, the mating conical surfaces of the large-diameter end outer conical surface of the cone 301 and the small-diameter end inner conical surface of the tail cone 110, and the large-diameter end outer conical surface of the first cone sleeve 200 and the small-diameter end inner conical surface of the cone 301 need to be paired and ground, and the surface finish is greater than or equal to Ra1.6, so as to ensure good airtightness.

[0024] In order to further ensure the stability of the structure of the embodiment, the number of telescopic cone sleeves 300 is not less than one, and the number of telescopic cone sleeves 300 is expanded to multiple levels according to the need; the telescopic cone sleeve 300 with less number of levels has simple structure and lower cost; the telescopic cone sleeve 300 with more number of levels can cover a larger pipe diameter range and has stronger adaptability.

[0025] In the embodiment, the number of telescopic cone sleeves 300 is two, including a first telescopic sleeve 310 and a second telescopic sleeve 320; the first telescopic sleeve 310 and the second telescopic sleeve 320 are sequentially sleeved, wherein the small-end outer conical surface of the first telescopic sleeve 310 is matched with the large-diameter end inner conical surface of the first cone sleeve 200, the large-end outer conical surface of the first telescopic sleeve 310 is matched with the small-end inner conical surface of the second telescopic sleeve 320, and the large-end outer conical surface of the second telescopic sleeve 320 is matched with the small-end inner conical surface of the tail cone sleeve 100.

[0026] In order to further ensure the stability of the structure of the embodiment, the tail cone sleeve 100, the first cone sleeve 200, the telescopic cone sleeve 300, the weight 400, the argon gas inlet 500 and the argon gas outlet 600 are made of metal materials, and preferably made of OCr25Ni20 or OCr18Ni9. The sealing sleeve 700 adopts copper or austenitic stainless steel as a base body, and is internally inlaid with high-temperature graphite filler or wrapped into a shape by using flexible graphite, to form a dynamic seal.

[0027] The technical solutions in the embodiments of the application have at least the following technical effects or advantages: Since the tail cone sleeve 100, the first cone sleeve 200, the telescopic cone sleeve 300, the weight 400, the argon gas inlet 500, the argon gas outlet 600 and the sealing sleeve 700 are made of metal materials, the all-metal structure enables the device to be directly close to a high-temperature welding bead; the device can directly withstand high-temperature radiation of a welding area, can be kept at an extremely close distance from the welding bead, ensures a shielding gas effect, has excellent high-temperature oxidation resistance, corrosion resistance and sufficient mechanical strength, and further withstands high-temperature radiation and thermal shock during welding.

[0028] In order to optimize the structure of the embodiment, the argon gas outlet 600 is arranged in the hammer head 430 and penetrates through the hammer head 430.

[0029] In order to further optimize the structure of the embodiment, a gap is arranged between the small-diameter end inner wall of the first cone sleeve 200 and the hammer rod 410, for sending argon gas out through the argon gas outlet 600.

[0030] In order to further optimize the structure of the embodiment, the outer taper surface of the large-diameter end of the taper 301 in the telescopic taper sleeve 300 is provided with an arc-shaped ring, which has the following effects: 1. The outer taper surface of the taper 301 and the inner taper surface of the small-diameter end of the tail cone 110 form linear contact sealing, and the outer taper surface of the taper 301 and the inner taper surface of the tail cone 110 form a local turbulent flow area when they are extruded, which has better air tightness than a smooth taper surface; 2. The arc-shaped ring of the outer taper surface of the taper 301 is blocked by the inner side of the small-diameter end of the tail cone 110, preventing the telescopic taper sleeve 300 from completely separating from the tail taper sleeve 100 due to excessive stretching. The outer taper surface of the large-diameter end of the first taper sleeve 200 is provided with an arc-shaped ring, which has the following effects: 1. The outer taper surface of the large-diameter end of the first taper sleeve 200 and the inner taper surface of the small-diameter end of the taper 301 form linear contact sealing, and the outer taper surface of the first taper sleeve 200 and the inner taper surface of the taper 301 form a local turbulent flow area when they are extruded, which has better air tightness than a smooth taper surface; 2. The arc-shaped ring of the outer taper surface of the first taper sleeve 200 is blocked by the inner side of the small-diameter end of the telescopic taper sleeve 300, preventing the first taper sleeve 200 from completely separating from the telescopic taper sleeve 300 due to excessive stretching.

[0031] The technical solutions in the embodiments of the application have at least the following technical effects or advantages: The outer taper surface of the large-diameter end of the taper 301 and the outer taper surface of the large-diameter end of the first taper sleeve 200 are provided with arc-shaped rings, so that the arc-shaped rings and the inner taper surfaces form a series of intermittent linear contact rings, which significantly reduces the contact area compared to a smooth taper surface, can produce greater local contact pressure under the same axial force, and thus effectively breaks through the tiny oxide layer or unevenness on the inner taper surface to form a more reliable seal; at the same time, the arc-shaped rings act as a buffer zone and a pressure equalization zone for the argon flow, making the argon protective gas more smoothly fill the pipeline.

[0032] As a conventional technical choice, the taper of the tail cone 110, the first taper sleeve 200, and the taper 301 is preferably 1:5 to 1:10, which ensures that when it is attached to the wall of a pipe with different inner diameters, it can be quickly positioned and centered, and can form sufficient contact stress to achieve effective sealing, while avoiding excessive locking force caused by excessive taper or poor sealing caused by insufficient taper; the mating taper surfaces of the tail cone 110, the first taper sleeve 200, and the taper 301 need to be precisely ground to ensure good air tightness after elongation; the taper sleeve wall thickness of the tail cone 110, the first taper sleeve 200, and the taper 301 is between 2mm and 5mm, which ensures the structural rigidity while minimizing the overall weight.

[0033] The working process of the embodiment is as follows: First, according to the inner diameter of the pipe to be welded, the number of taper sleeves to be pulled out is preliminarily estimated, the tail taper sleeve 100 corresponding to the inner diameter of the pipe is selected as the outermost sealing surface; the first taper sleeve 200 and the telescopic taper sleeve 300 are stretched and inserted into the inside of the pipe until the tapered outer wall of the tail taper sleeve 100 or the telescopic taper sleeve 300 is tightly fitted with the inner wall of the pipe, forming a seal; or the telescopic taper sleeve 300 is tightly fitted with the inner wall of the pipe, and the tail taper sleeve 100 is usually used to block the pipe; due to the self-centering effect of the taper surface, the device will automatically align, and a slight pushing force can make the outermost sealing surface and the inner wall of the pipe have enough contact stress to form a seal; Secondly, connect the argon hose to the argon inlet 500 on the tail taper sleeve 100, open the argon, and the argon flows through the argon inlet 500 into the tail taper sleeve 100, the telescopic taper sleeve 300 and the first taper sleeve 200, and then enters the inside of the pipe to be filled with argon through the argon outlet 600, and the air in the pipe is discharged and the back of the weld is protected; Thirdly, adjust the argon flow to the required value and perform the pipe welding operation; Fourthly, after welding is completed, the argon is turned off and the argon hose is disconnected; under normal circumstances, the device is directly pulled out of the pipe; if the device is stuck due to thermal deformation, the operator holds the tail taper sleeve 100 with one hand and holds the hammer handle 420 with the other hand, and hits or pulls the heavy hammer 400 backward with force, the hammer head 430 of the heavy hammer 400 hits the first taper sleeve 200, the first taper sleeve 200 hits the annular baffle 302 of the telescopic taper sleeve 300, and the impact force is transmitted in sequence, the first taper sleeve (200) and the telescopic taper sleeve (300) are shaken loose, the first taper sleeve (200) and the telescopic taper sleeve (300) are slightly displaced inward, so that they are separated from the inner wall of the pipe, and then the device is easily taken out.

[0034] Finally, after the device is taken out, the head of the first taper sleeve 200 is pushed back to the tail taper sleeve 100, all telescopic taper sleeves 300 will be retracted in turn, and finally the first taper sleeve 200 and the telescopic taper sleeve 300 are stored in the tail taper sleeve 100, which is convenient for putting into the tool box for storage.

[0035] The description of the present application is given for example and description, and is not exhaustive or limits the present application to the disclosed form. Many modifications and changes are obvious to those skilled in the art. The selection and description of embodiments are to better illustrate the principles and practical application of the present application, and to enable those skilled in the art to understand the present application so as to design various embodiments with various modifications suitable for specific purposes.

[0036] Finally, it should be noted that: The above merely describes the preferred embodiments of the present application and is not used to limit the present application. Although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or equivalently replace some technical features thereof, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A telescopic argon filling device, characterized in that: It includes a tail cone sleeve (100), a telescopic cone sleeve (300), a head cone sleeve (200), a counterweight (400), an argon inlet (500), an argon outlet (600), and a sealing sleeve (700). The tail cone sleeve (100) includes a tail cone (110), one end of which is a small diameter end and the other end is a large diameter end. A tail cone base (120) is provided at the large diameter end, and a bushing (130) is provided in the middle of the tail cone base (120). The argon gas inlet (500) is located on the outside of the tail cone base (120) and is used to connect the argon gas hose; The telescopic cone sleeve (300) is nested in the tail cone sleeve (100) and includes a cone (301). One end of the cone (301) is a small-diameter end and the other end is a large-diameter end. The outer cone surface of the large-diameter end of the cone (301) and the inner cone surface of the small-diameter end of the tail cone (110) are sealed by the cone surface cooperation. A circular baffle (302) is provided at the large-diameter end of the cone (301). The first conical sleeve (200) is nested in the telescopic conical sleeve (300), with one end being a small diameter end and the other end being a large diameter end. The outer conical surface of the large diameter end of the first conical sleeve (200) and the inner conical surface of the small diameter end of the cone (301) are sealed by the conical surface cooperation. The large diameter end of the first conical sleeve (200) is limited by the circular baffle (302). The hammer (400) includes a hammer rod (410), which passes through the tail cone sleeve (100), the telescopic cone sleeve (300) and the head cone sleeve (200) in sequence. A hammer head (430) is provided at the front end of the hammer rod (410), and a hammer handle (420) is provided at the tail end of the hammer rod (410). The argon gas outlet (600) is a through hole provided on the hammer head (430) for delivering argon gas into the pipeline; The sealing sleeve (700) is disposed on the bushing (130) for dynamic sealing between the counterweight (400) and the tail cone sleeve (100); The first cone sleeve (200), the telescopic cone sleeve (300), and the tail cone sleeve (100) are nested and assembled in sequence. The outer diameter of the tail cone sleeve (100) and the inner diameter of the pipe are respectively used as the outermost sealing surface and the pipe is sealed. When extended, the outer cone surface of the large diameter end of the first cone sleeve (200) is sealed and fitted with the inner cone surface of the small diameter end of the cone (301), and the outer cone surface of the cone (301) is sealed and fitted with the inner cone surface of the tail cone (110). Argon gas enters from the argon gas inlet (500), flows through the inner cavity of the tail cone sleeve (100), the telescopic cone sleeve (300), and the first cone sleeve (200), and enters the pipe to be filled with argon through the argon gas outlet (600). When contracted, the first cone sleeve (200) and the telescopic cone sleeve (300) are stored in the tail cone sleeve (100) by the hammering of the heavy hammer (400).

2. The telescopic argon filling device according to claim 1, characterized in that: The mating conical surfaces of the outer conical surface at the large diameter end of the cone (301) and the inner conical surface at the small diameter end of the tail cone (110), and the outer conical surface at the large diameter end of the first conical sleeve (200) and the inner conical surface at the small diameter end of the cone (301) need to be paired and ground to achieve a surface finish of Ra1.6 or higher.

3. The telescopic argon filling device according to claim 1, characterized in that: The telescopic cone sleeve (300) has at least one stage and can be extended to multiple stages as needed.

4. The telescopic argon filling device according to claim 1, characterized in that: The tail cone sleeve (100), the head cone sleeve (200), the telescopic cone sleeve (300), the counterweight (400), the argon inlet (500), and the argon outlet (600) are made of metal materials, preferably OCr25Ni20 or OCr18Ni9. The sealing sleeve (700) is made of copper or austenitic stainless steel as the base material, and is inlaid with high-temperature graphite filler or formed by flexible graphite winding.

5. A telescopic argon filling device according to claim 1, characterized in that: The argon gas outlet (600) is arrayed on the hammer head (430) and extends through the hammer head (430).

6. A telescopic argon filling device according to claim 1, characterized in that: A gap is provided between the inner wall of the small diameter end of the first cone sleeve (200) and the hammer rod (410) for argon gas to pass through the gap and be sent out through the argon gas outlet (600).

7. A telescopic argon filling device according to claim 1, characterized in that: The telescopic cone sleeve (300) has an arc-shaped ring on the outer conical surface of the large-diameter end of the cone (301). The first function is to make the outer conical surface of the cone (301) and the inner conical surface of the small-diameter end of the tail cone (110) form a line contact seal. When the outer conical surface of the cone (301) and the inner conical surface of the tail cone (110) are squeezed, a local turbulent zone is formed, which has better air tightness than a smooth conical surface. The second function is that the arc-shaped ring on the outer conical surface of the cone (301) is blocked by the inner side of the small-diameter end of the tail cone (110), preventing the telescopic cone sleeve (300) from completely detaching from the tail cone sleeve (100) due to excessive stretching. The outer conical surface of the large-diameter end of the first conical sleeve (200) is provided with an arc-shaped ring. Its functions are as follows: First, it enables the outer conical surface of the large-diameter end of the first conical sleeve (200) to form a line contact seal with the inner conical surface of the small-diameter end of the cone (301). When the outer conical surface of the first conical sleeve (200) is squeezed with the inner conical surface of the cone (301), a local turbulent zone is formed, which has better air tightness than a smooth conical surface. Second, the arc-shaped ring on the outer conical surface of the first conical sleeve (200) is blocked by the inner side of the small-diameter end of the telescopic conical sleeve (300), preventing the first conical sleeve (200) from completely detaching from the telescopic conical sleeve (300) due to excessive stretching.

8. A telescopic argon filling device according to claim 1, characterized in that: The taper of the tail cone (110), the head cone sleeve (200), and the cone (301) is 1:5 to 1:10, and the wall thickness is between 2 mm and 5 mm.

9. A telescopic argon filling method, characterized in that: The telescopic argon filling device according to any one of claims 1 to 8 includes the following steps: Step 1: Based on the inner diameter of the pipe to be welded, make a preliminary estimate of the number of tapered sleeve stages that need to be pulled out, and select the tail tapered sleeve (100) corresponding to the inner diameter of the pipe as the outermost sealing surface; stretch the first tapered sleeve (200) and the telescopic tapered sleeve (300) and insert them into the pipe until the tapered outer wall of the tail tapered sleeve (100) is tightly fitted with the inner wall of the pipe to form a seal; Step 2: Connect the argon hose to the argon inlet (500) on the tail cone sleeve (100), turn on the argon gas, and let the argon gas flow through the argon inlet (500) into the inner cavity of the tail cone sleeve (100), telescopic cone sleeve (300) and head cone sleeve (200), and then through the argon outlet (600) into the inside of the pipe to be filled with argon, so as to expel the air from the pipe and protect the back of the weld. Step 3: Adjust the argon gas flow rate to the required value and then proceed with the pipe welding operation; Step 4: After welding is completed, turn off the argon gas and disconnect the argon gas hose; normally, simply pull the device out of the pipeline. Step 5: After the device is taken out, hold the head of the first cone sleeve (200) and push it back towards the tail cone sleeve (100). All the telescopic cone sleeves (300) will retract in sequence, and finally the first cone sleeve (200) and the telescopic cone sleeve (300) will be stored in the tail cone sleeve (100) for easy storage in the toolbox.

10. A telescopic argon filling method according to claim 9, characterized in that: In step 1, the conical outer wall of the telescopic conical sleeve (300) is tightly fitted with the inner wall of the pipe to form a seal; In step 4, if the device gets stuck due to thermal deformation, the operator holds the tail cone sleeve (100) with one hand and the hammer handle (420) with the other hand, and strikes or pulls the heavy hammer (400) backward with force. The hammer head (430) of the heavy hammer (400) hits the first cone sleeve (200), and the first cone sleeve (200) then hits the circular baffle (302) of the telescopic cone sleeve (300). The resulting impact force is transmitted in sequence, which loosens the first cone sleeve (200) and the telescopic cone sleeve (300), causing the first cone sleeve (200) and the telescopic cone sleeve (300) to make a slight inward displacement, separating them from the inner wall of the pipe. Then the device can be easily removed.

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