Internal expansion tool for pipe fitting welding
By designing the inner-swelling tooling for pipe fitting welding, using annular fixtures and convex fixing the pipe body, combining the limiting assembly and mounting seat, the problem of large position error of EGR pipeline welding is solved, high-precision welding is achieved and production costs are reduced.
Patent Information
- Application Number
- CN202420685398.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-03
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-03
AI Technical Summary
During the welding process of existing EGR pipelines, the position dimensional error between the pipe body and the flange is large, resulting in motion interference problems easily after welding, making it difficult to ensure accuracy.
A kind of internal expansion tool for welding pipe fittings is designed, including a base, internal expansion fixing and telescopic parts. The fixing and position limiting the pipe body through annular clamping flap and protrusions is designed, and the limiting assembly and mounting seat are combined to accurately determine. The relative position of the pipe body and the flange.
It improves the accuracy of welding position dimensionality, reduces the motion interference between the pipe body and the vehicle body parts after welding, reduces production costs, and simplifies the manufacturing process.
Smart Images
Figure CN222344625U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of pipe fitting welding equipment, and more specifically to an internal expansion tool for pipe fitting welding. Background Art
[0002] In order to meet the increasingly stringent emission regulations, existing manufacturers mostly use exhaust gas recirculation (EGR) systems to reduce nitrogen oxide emissions. The EGR system includes an EGR cooler, an EGR valve, and an EGR pipeline, which is used to transport exhaust gas. There is an existing EGR pipeline, such as Figure 1 As shown, it includes a tube body 90 and a flange 91 . The flange 91 is located at one end of the tube body 90 and is welded to the tube body 90 .
[0003] It should be noted that one end of the flange 91 has a connecting hole 911. When the tube body 90 is welded to the flange 91, a clamp is used to clamp the end of the flange 91 facing away from the tube body 90. Then the welder inserts the tube body 90 into the flange 91, holds the tube body 90 with one hand, and holds the welding gun with the other hand to weld the tube body 90 to the flange 91. However, when the tube body 90 is inserted into the flange 91, the circumferential position dimension of the tube body 90 relative to the connecting hole 911 has a large error if only manually measured. When the circumferential position dimension error of the tube body 90 relative to the connecting hole 911 is large, when the flange 91 is connected to the vehicle body, the tube body 90 is prone to interfere with the movement of components on the vehicle body.
[0004] Therefore, there is a need to provide an internal expansion tool for pipe welding that helps to improve the positional dimensional accuracy. Utility Model Content
[0005] The main purpose of the present application is to provide an internal expansion tool for pipe welding, which is used to weld the end of the pipe body to the flange as an integral whole, wherein the internal expansion tool for pipe welding comprises a base, an internal expansion clamp and a telescopic member, the internal expansion clamp comprises a plurality of clamping petals arranged in a ring, the clamping petals move toward or away from each other, when the flange and the pipe body are mounted on the base, the clamping petals pass through the flange and extend into the pipe body for a predetermined distance, the telescopic member is slidably arranged on the base and extends into or out of the end of the pipe body away from the flange, one end of the pipe body is fixed by the internal expansion clamp, and the angle of the other end of the pipe body is limited by the telescopic member, which has the advantage of helping to improve the positional dimensional accuracy compared to the prior art.
[0006] Another object of the present application is to provide an internal expansion tool for pipe welding, wherein each side of the clamp has a convex head, and the convex head is in point contact with the inside of the pipe body. By setting the convex head, the clamp is in point contact with the inner wall of the pipe to increase the pressure.
[0007] In order to achieve at least one of the above-mentioned invention purposes, the present application provides an internal expansion tool for pipe welding, which is used to weld the end of a pipe body and a flange into one piece, wherein the internal expansion tool for pipe welding comprises:
[0008] a base; and
[0009] an internal expansion clamp, the internal expansion clamp comprising a plurality of clamping petals arranged in an annular shape, the clamping petals moving toward or away from each other, and when the flange and the tube body are mounted on the base, the clamping petals pass through the flange and extend into the tube body by a predetermined distance; and
[0010] A telescopic member is slidably arranged on the base and extends into or out of an end of the tube body away from the flange.
[0011] In one or more embodiments of the present application, each of the clip petals has a convex head on its side, and the convex head is in point contact with the inner part of the tube body.
[0012] In one or more embodiments of the present application, the internal expansion tool for pipe welding also includes a first mounting seat, which is arranged on the base, and the first mounting seat has a first through hole and a positioning protrusion, and the flange has a connecting hole, a connecting portion and a first through flow hole, and when the flange is installed on the first mounting seat, the positioning protrusion extends into the connecting hole, and the connecting portion extends into the first through hole.
[0013] In one or more embodiments of the present application, the internal expansion tool for pipe welding also includes a limit assembly, the limit assembly includes a first limit piece, the first limit piece has a first groove, when the end of the tube body close to the flange extends into the first flow hole, the end of the tube body close to the flange is placed in the first groove.
[0014] In one or more embodiments of the present application, the first limit member is located above the flange, and when one end of the tube body close to the flange is placed in the first groove, the outer wall of the tube body abuts against the side wall of the first groove, and the bottom of the tube body fits against the top surface of the flange.
[0015] In one or more embodiments of the present application, the first limiting member is slidably disposed on the base and is close to or away from an end of the tube body close to the flange.
[0016] In one or more embodiments of the present application, the limiting assembly further includes a plurality of second limiting members, each of the second limiting members has a second groove, and one end of the tube body facing away from the flange is placed in each of the second grooves.
[0017] In an embodiment of the present application, an internal expansion tool for pipe welding is used to weld a pipe body and a flange into one piece, and includes a base, an internal expansion clamp and a telescopic member. The internal expansion clamp includes a plurality of clamping petals arranged in a ring, and the clamping petals move toward or away from each other. When the flange and the pipe body are installed on the base, the clamping petals pass through the flange and extend into the pipe body a predetermined distance. The telescopic member is slidably arranged on the base and extends into or out of the end of the pipe body away from the flange. One end of the pipe body is fixed by the internal expansion clamp, and the angle of the other end of the pipe body is limited by the telescopic member. Compared with the prior art, it has the advantage of helping to improve the accuracy of positional dimensions. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] These and / or other aspects and advantages of the present application will become clearer and easier to understand from the following detailed description of the embodiments of the present application in conjunction with the accompanying drawings, in which:
[0019] Figure 1 The figure shows a structural schematic diagram of an existing EGR pipeline;
[0020] Figure 2 The figure shows a structural schematic diagram of an internal expansion tool for pipe welding of the utility model from a certain viewing angle;
[0021] Figure 3 Picture shows Figure 2 A local enlarged view of point C;
[0022] Figure 4 The figure shows a structural schematic diagram of an internal expansion tool for pipe welding from another perspective;
[0023] Figure 5 The figure shows a schematic structural diagram of the breaking piece. DETAILED DESCRIPTION
[0024] The terms and words used in the following specification and claims are not limited to the literal meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustrative purposes only and not for the purpose of limiting the present application as defined by the appended claims and their equivalents.
[0025] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.
[0026] Although ordinals such as "first," "second," and the like will be used to describe various components, those components are not limited herein. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and likewise, a second component may be referred to as a first component without departing from the teachings of the utility model concept. The term "and / or" as used herein includes any and all combinations of one or more associated listed items.
[0027] The terms used herein are only used for the purpose of describing various embodiments and are not intended to be limiting. As used herein, singular forms are intended to also include plural forms, unless the context clearly indicates an exception. In addition, it will be understood that the terms "including" and / or "having" when used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.
[0028] Application Overview
[0029] There is an existing EGR pipeline. When the pipe body is extended into the flange, the circumferential position size of the pipe body relative to the connecting hole has a large error if it is only judged manually. When the circumferential position size error of the pipe body relative to the connecting hole is large, when the flange is connected to the vehicle body, the pipe body is easy to interfere with the movement of components on the vehicle body.
[0030] Based on the above technical problems, the present application proposes an internal expansion tool for pipe welding, wherein the internal expansion tool for pipe welding has a simple structure, does not involve complicated manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the internal expansion tool for pipe welding provided by the present application is easy to produce and low in cost, which is more conducive to controlling production costs and further conducive to product promotion and use.
[0031] Schematic internal expansion tooling for pipe welding,
[0032] refer to Figures 1 to 5 According to a preferred embodiment of the utility model, a pipe welding internal expansion tool is used for welding EGR pipelines, such as Figure 1 As shown, the EGR pipeline includes a pipe body 90 and a flange 91. One end of the pipe body 90 is welded to the flange 91 through the internal expansion tooling for pipe welding and forms an integral body.
[0033] It should be noted that if Figure 1As shown, the flange 91 has a connection hole 911, a connection portion 912 and a through first flow hole 913, the first flow hole 913 is a stepped hole, and the tube body 90 has a through second flow hole (not shown in the figure). When one end of the tube body 90 extends into the first flow hole 913, the tube body 90 is welded to the flange 91, and the first flow hole 913 is connected to the second flow hole. The connection hole 911 is used to connect the flange 91 with the external vehicle body, and the connection portion 912 extends a predetermined distance from the end of the flange 91 with the connection hole 911 in the direction away from the tube body 90, and the connection portion 912 is used to connect with an external pipe. In order to avoid the movement interference between the tube body 90 and the components on the vehicle body after the connection hole 911 is connected to the external vehicle body, the circumferential position dimension of the tube body 90 relative to the connection hole 911 is an important processing dimension. In view of this, in an embodiment of the present application, the circumferential position of the tube body 90 relative to the connecting hole 911 is determined by the internal expansion tool for pipe welding, so that after the welding personnel weld the tube body 90 and the flange 91, the relative position of the tube body 90 and the flange 91 is within the rated range.
[0034] Specifically, Figure 2 and Figure 4 As shown, the internal expansion tool for pipe welding includes a base 10, an internal expansion fixture 20, a telescopic member 30 and a first mounting seat 40.
[0035] More specifically, if Figure 2 and Figure 3 As shown, the internal expansion clamp 20 includes a plurality of clamping flaps 201 arranged in a ring shape, and the clamping flaps 201 move toward or away from each other. When the flange 91 and the tube body 90 are installed on the base 10, the clamping flaps 201 pass through the flange 91 and extend into the tube body 90 by a predetermined distance.
[0036] In addition, if Figure 4 As shown, the telescopic member 30 is slidably disposed on the base 10 and extends into or out of the end of the tube body 90 away from the flange 91 .
[0037] In addition, if Figure 2 and Figure 3 As shown, the first mounting seat 40 is arranged on the base 10, and the first mounting seat 40 has a first through hole 401 and a positioning protrusion 402. When the flange 91 is installed on the first mounting seat 40, the positioning protrusion 402 extends into the connecting hole 911, and the connecting part 912 extends into the first through hole 401.
[0038] It should be noted that the clamping flap 201 and the telescopic member 30 are respectively located at the two ends of the EGR pipeline, and the telescopic member 30 extends into the end of the tube body 90 away from the flange 91 to limit the circumferential position of the tube body 90 relative to the flange 91; in addition, when the tube body 90 extends into the first flow hole 913, under the action of the self-weight of the tube body 90, the end of the tube body 90 abuts against the inner hole shoulder of the first flow hole 913; in addition, since the tube body 90 and the first flow hole 913 are gap-matched In order to prevent the end of the tube body 90 close to the flange 91 from moving during the welding process, the clamping flap 201 passes through the flange 91 and extends into the tube body 90, and a tightening force is applied to the inner wall of the end of the tube body 90 where the flange 91 is provided, so as to fix the position of the end of the tube body 90 close to the flange 91; in addition, by allowing the connecting portion 912 of the flange 91 to extend into the first through hole 401 and the positioning protrusion 402 to extend into the connecting hole 911, the circumferential position size of the flange 91 is fixed. It should be noted that, compared with the prior art in which only the position of the flange 91 is fixed, and the position of the tube body 90 relative to the flange 91 is only determined by manual measurement, the embodiment of the present application sets the telescopic member 30 at the end of the tube body 90 away from the flange 91, limits the circumferential position of the tube body 90 by the telescopic member 30, limits the circumferential position of the flange 91 by the positioning protrusion 402, and tightens the end of the tube body 90 close to the flange 91 by the clamping flap 201. This has the advantage of helping to improve the positional dimensional accuracy, so that subsequent welding personnel can perform preliminary pre-fixation welding on the connection between the tube body 90 and the flange 91.
[0039] Furthermore, in the prior art, the side surface of the clamping petal 201 of the internal expansion clamp 20 is in surface contact with the inner hole wall of the workpiece to be clamped. Since the contact area is large, that is, S in "P=F / S" is large (P is pressure, F represents the total force borne by the force-bearing surface, and S represents the force-bearing area), then at this time, in order to increase the pressure of the internal expansion clamp 20 on the hole wall of the second flow hole of the tube body 90, it is only possible to increase the force per unit area. This places high requirements on the specifications of the drive motor in the internal expansion clamp 20, thereby increasing the overall cost of the internal expansion clamp 20.
[0040] In view of this, in the embodiments of the present application, Figure 3As shown, each of the side surfaces of the clamping flap 201 has a convex head 2011, and the convex head 2011 is in point contact with the interior of the tube body 90. The convex head 2011 is further implemented as a hemisphere, and each hemisphere is welded to the corresponding clamping flap 201. When expanded, each of the convex head 2011 is in point contact with the hole wall of the second flow hole of the tube body 90. Compared with the previous surface contact, the actual force-bearing area is smaller, thereby achieving the technical effect of greater pressure on the tube body 90 when the specifications of the driving motor in the internal expansion clamp 20 are equal.
[0041] Furthermore, if Figure 4 As shown, the internal expansion clamp 20 also includes a support seat 202, and the support seat 202 is located between the base 10 and the first mounting seat 40, and the bottom surface and the top surface of the support seat 202 are respectively fixedly connected to the base 10 and the first mounting seat 40, and its fixed connection method includes but is not limited to welding or bolt connection. The support seat 202 has a mounting hole (not marked in the figure), and the end of each clamping petal 201 away from the protrusion 2011 is placed in the mounting hole.
[0042] In addition, if Figure 2 As shown, the internal expansion clamp 20 also includes a lifting member 203, the lifting member 203 is cylindrical as a whole, one end of the lifting member 203 has a first conical surface (not marked in the figure), and each of the clamping petals 201 has a second conical surface (not marked in the figure) on the opposite side, and one end of the lifting member 203 having the first conical surface passes through the mounting hole and is located at the center of the clamping petals 201 arranged in an annular manner, and the first conical surface is in contact with the second conical surface, and the outer side of each clamping petal 201 is The side sleeve is provided with a plurality of elastic tightening rings (not marked in the figure). When the lifting member 203 moves downward, the first conical surface portion applies a horizontal force to the second conical surface portion, and causes each of the clamping petals 201 to move away from each other relative to the central axis of the lifting member 203, and tightens the pipe fitting through the convex head 2011; when the lifting member 203 moves upward, the elastic force of the elastic tightening ring causes each of the clamping petals 201 to move toward each other, and causes the convex head 2011 to separate from the tube body 90.
[0043] Furthermore, in order to realize the up and down movement of the lifting member 203, as Figure 2As shown, the internal expansion clamp 20 also includes a second mounting seat 204, a crankshaft 205 and a first connecting rod 206. The second mounting seat 204 is located below the base 10 and is fixedly connected to the base 10. Its fixed connection method includes but is not limited to welding or threaded connection. The crankshaft 205 is rotatably mounted on the second mounting seat 204 through a bearing. One end of the first connecting rod 206 is rotatably connected to the eccentric part of the crankshaft 205 in a hinged manner. The other end of the first connecting rod 206 is rotatably connected to the lifting member 203. When the crankshaft 205 rotates, the first connecting rod 206 moves up and down, and drives the lifting member 203 to move up and down.
[0044] Furthermore, in order to provide positioning and support for the tube body 90, as Figure 2 and Figure 4 As shown, the internal expansion tool for pipe welding also includes a limit assembly 50, and the limit assembly 50 includes a first limit member 501. The first limit member 501 has a first groove 5011. When the end of the tube body 90 close to the flange 91 extends into the first flow hole 913, the end of the tube body 90 close to the flange 91 is placed in the first groove 5011.
[0045] It should be noted that, in the embodiment of the present application, the first limit member 501 is slidably disposed on the base 10 via a slide rail, and when the first limit member 501 slides, the first groove 5011 approaches or moves away from the end of the tube body 90 close to the flange 91.
[0046] In addition, the first limit member 501 is located above the flange 91. When one end of the tube body 90 close to the flange 91 is placed in the first groove 5011, the outer wall of the tube body 90 abuts against the side wall of the first groove 5011, and the bottom of the tube body 90 fits against the top surface of the flange 91.
[0047] To fix the position of the first limiting member 501, Figure 2 and Figure 4 As shown, the first limiting member 501 has a fastener 5012, one end of the fastener 5012 is threadedly connected to the first limiting member 501 and passes through the fastener 5012 to abut or separate from the base 10. When the fastener 5012 is tightened, the first limiting member 501 is not easy to slide, and when the fastener 5012 is loosened, the first limiting member 501 can slide.
[0048] In addition, if Figure 4As shown, the limiting assembly 50 further includes a plurality of second limiting members 502, each of which has a second groove 5021, and one end of the tube body 90 away from the flange 91 is placed in each of the second grooves 5021. In the embodiment of the present application, the number of the second limiting members 502 is two, and each of the second limiting members 502 is fixedly connected to the base 10, and the fixed connection method includes but is not limited to welding or threaded connection.
[0049] Furthermore, in order to realize that the telescopic member 30 is slidably arranged on the base 10, as shown in FIG. Figure 4 and Figure 5 As shown, the internal expansion tool for pipe welding also includes a third mounting seat 601, a prying handle 602, a second connecting rod 603 and a third connecting rod 604, the third mounting seat 601 is fixedly connected to the base 10 by bolt connection, one end of the prying handle 602 is rotatably connected to the third mounting seat 601 by hinged connection, one end of the second connecting rod 603 is rotatably connected to the base 10 by hinged connection, the other end of the second connecting rod 603 has an annular groove (not shown in the figure), and the telescopic member 30 is away from the tube body 90. One end passes through the annular groove and abuts against the second connecting rod 603, and the telescopic member 30 is slidably arranged in the annular groove, and the two ends of the third connecting rod 604 are respectively connected to the second connecting rod 603 and the bend handle 602 in a hinged manner to realize rotation, and the distance from the hinge of the bend handle 602 and the third connecting rod 604 to the hinge of the bend handle 602 and the third mounting seat 601 is greater than the distance from the hinge of the bend handle 602 and the third connecting rod 604 to the hinge of the second connecting rod 603 and the third connecting rod 604. When the bend handle 602 rotates, the third connecting rod 604 moves and drives the second connecting rod 603 to move, and the second connecting rod 603 drives the telescopic member 30 to slide.
[0050] In summary, the internal expansion tool for pipe welding based on the embodiment of the present application is explained, which provides the internal expansion tool for pipe welding with advantages such as helping to improve positional dimensional accuracy.
[0051] It is worth mentioning that in the embodiment of the present application, the internal expansion tooling for pipe welding has a simple structure, does not involve complex manufacturing processes and expensive materials, and has high economic efficiency. At the same time, for manufacturers, the internal expansion tooling for pipe welding provided by the present application is easy to produce and has low cost, which is more conducive to controlling production costs and further conducive to product promotion and use.
[0052] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.
Claims
1. An internal expansion tool for pipe welding, used to weld the end of a pipe body and a flange into one piece, characterized in that: The internal expansion tool for pipe welding comprises a base; and an internal expansion clamp, the internal expansion clamp comprising a plurality of clamping petals arranged in an annular shape, the clamping petals moving toward or away from each other, and when the flange and the tube body are mounted on the base, the clamping petals pass through the flange and extend into the tube body by a predetermined distance; and A telescopic member is slidably arranged on the base and extends into or out of an end of the tube body away from the flange.
2. The internal expansion tool for pipe welding according to claim 1, characterized in that: The side surface of each clip is provided with a convex head, and the convex head is in point contact with the inner part of the tube body.
3. The internal expansion tool for pipe welding according to claim 1 or 2, characterized in that: The internal expansion tool for pipe welding also includes a first mounting seat, which is arranged on the base. The first mounting seat has a first through hole and a positioning protrusion. The flange has a connecting hole, a connecting portion and a first through flow hole. When the flange is installed on the first mounting seat, the positioning protrusion extends into the connecting hole, and the connecting portion extends into the first through hole.
4. The internal expansion tool for pipe welding according to claim 3, characterized in that: The internal expansion tool for pipe welding also includes a limit assembly, which includes a first limit piece. The first limit piece has a first groove. When the end of the tube body close to the flange extends into the first flow hole, the end of the tube body close to the flange is placed in the first groove.
5. The internal expansion tool for pipe welding according to claim 4, characterized in that: The first stopper is located above the flange. When the end of the tube body close to the flange is placed in the first groove, the outer wall of the tube body abuts against the side wall of the first groove, and the bottom of the tube body fits against the top surface of the flange.
6. The internal expansion tool for pipe welding according to claim 4, characterized in that: The first stopper is slidably disposed on the base and is close to or away from an end of the tube body close to the flange.
7. The internal expansion tool for pipe welding according to claim 4, characterized in that: The limiting assembly further comprises a plurality of second limiting members, each of which has a second groove, and one end of the tube body away from the flange is placed in each of the second grooves.