Assembly welding tool for egr cooler

Abstract

The application belongs to the field of welding equipment and discloses an EGR cooler assembling and welding tool, which comprises two oppositely distributed support components, two clamping end plates corresponding to the two support components are arranged between the two support components, a group of end clamping assemblies are arranged between the clamping end plates and the support components, the end clamping assemblies are used for clamping end shell bodies of the EGR cooler, front clamping pieces and rear clamping pieces which are distributed in front and back and staggered in height are arranged between the two clamping end plates, the front clamping pieces and the rear clamping pieces are used for clamping middle half shells of the EGR cooler, the clamping end plates, the front clamping pieces and the rear clamping pieces form an open welding seam space after clamping and positioning, and the open welding seam space comprises a welding seam area of the end shell bodies and the middle half shells and a butt welding seam area of the two middle half shells. The application has the advantages of reasonable design, reduced welding error, guaranteed welding quality, high speciality and suitability for large-scale promotion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of welding equipment, and relates to a welding tool, in particular to an assembly welding tool for an EGR cooler. BACKGROUND

[0002] The EGR cooler, i.e. the exhaust gas recirculation cooler, is a key component in the exhaust gas recirculation system (EGR system) of an automobile. When the engine is running, the ECM controls the EGR valve to open according to signals such as the engine cooling water temperature sensor, the throttle position sensor and the air flow sensor, so that a part of the high-temperature exhaust gas flows out from the exhaust manifold and enters the EGR cooler through the intake pipe. The EGR cooler has a cooling pipe inside, and a high-efficiency heat exchanger structure is usually used in the cooling pipe, which is composed of multiple small channels. The exhaust gas flows in these channels and exchanges heat with the cooling pipe wall, so that the heat is transferred to the cooling medium, thereby rapidly reducing the temperature of the exhaust gas.

[0003] The integrated design of the EGR cooler shell is the result of a balance between reliability, efficiency and cost, and its advantages are more significant especially in high-performance engines and scenes with strict emission regulations. When the EGR cooler shell is assembled and repaired, it needs to be split under certain standard support, such as two end shells at both ends of the shell, and two half shells in the middle part which are split from the position close to the center line, a total of four disassembled parts. Usually, the welding tool for the EGR cooler is designed for the pipes and ribs on the shell, such as the assembly welding tool for the EGR cooler intake pipe disclosed in CN208977178U and the EGR pipe welding positioning device disclosed in CN219131352U. However, when welding the EGR cooler shell, there are obvious deficiencies in clamping with non-special tools due to the design of the individual surfaces and the end parts due to the design of the pipe openings and nozzles. On the other hand, the parts that need to be disassembled need to be welded one by one, which increases the welding tolerance and is not conducive to ensuring product quality, which directly affects the actual life of the product and increases the cost of replacing the assembly. SUMMARY

[0004] The present application proposes an assembly welding tool for an EGR cooler, which is designed reasonably, helps to reduce welding errors, ensures welding quality and has strong speciality, aiming at the technical problems of the welding tool for the EGR cooler.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is that the assembling and welding tool for the EGR cooler provided by the present application comprises two oppositely distributed support components, two clamping end plates corresponding to the two support components are arranged between the two support components, a set of end clamping assemblies are arranged between the clamping end plates and the support components, the end clamping assemblies are used to clamp the end housings of the EGR cooler, front clamping pieces and rear clamping pieces which are distributed in front and back and staggered in height are arranged between the two clamping end plates, the front clamping pieces and the rear clamping pieces are used to clamp the middle half shells of the EGR cooler, the clamping end plates, the front clamping pieces and the rear clamping pieces form an open welding seam space after clamping and positioning, and the open welding seam space comprises a welding seam area of the end housings and the middle half shells and a butt welding seam area of the two middle half shells.

[0006] As a preference, the front clamping piece comprises two front support plates which are oppositely distributed and correspond to the clamping end plates, two front clamping plates are arranged between the front support plates, a front rib plate is arranged between the front clamping plates, the front support plates, the front clamping plates and the front rib plate are welded into an integral whole, the front clamping plate comprises a front vertical groove part, the groove back surface of the front vertical groove part faces the rear clamping piece, a vertical long strip-shaped front plate hole is arranged on the groove surface of the front vertical groove part, an upper limiting plate is arranged on the top of the groove back surface of the front vertical groove part, and the length of the upper limiting plate is smaller than the width of the middle half shell.

[0007] As a preference, the rear clamping piece comprises two rear support plates which are oppositely distributed and correspond to the clamping end plates, two rear clamping plates are arranged between the rear support plates, a rear rib plate is arranged between the rear clamping plates, the rear support plates, the rear clamping plates and the rear rib plate are welded into an integral whole, the rear clamping plate comprises a rear vertical groove part, the groove back surface of the rear vertical groove part faces the rear clamping piece, a vertical long strip-shaped rear plate hole is arranged on the groove surface of the rear vertical groove part, a lower limiting plate is arranged on the bottom of the groove back surface of the rear vertical groove part, and the length of the lower limiting plate is smaller than the width of the middle half shell.

[0008] As a preference, the front support plates and the rear support plates are staggered in height, four slide openings which are symmetrically distributed in pairs are arranged on the clamping end plate, the slide openings are horizontally slidably matched with the front support plates and the rear support plates, and the front support plates and the rear support plates are T-shaped rib plates.

[0009] As a preference, positioning plug covers are arranged on the two sides of the clamping end plate, the positioning plug cover is provided with a plug groove matched with the circumferential part of the clamping end plate, the plug groove is provided with a positioning plug opening matched with the front support plates and the rear support plates at a position close to one end of the plug groove, the plug groove is provided with a positioning key at a position close to the other end of the plug groove, the positioning key is plug-insertedly matched with the slide opening, and a holding protrusion for hand holding is arranged on the outer wall edge of the positioning plug cover.

[0010] As preferred, the groove back bottom of the front clamping plate is provided with a front flange part which is bent and extended first upward and then towards the groove direction of the front clamping plate, the groove back bottom of the rear vertical groove part is provided with a rear flange part which is bent and extended first downward and then towards the groove direction of the rear clamping plate, and a positioning pull plate is arranged between the front clamping part and the rear clamping part to control the up-down relative distance and the maximum front-rear distance of the front clamping plate and the rear clamping plate.

[0011] As preferred, the positioning pull plate comprises a Z-shaped part, the top surface of the Z-shaped part is flush with the lower limiting plate, the middle part of the Z-shaped part is parallel to the inclined part of the rear flange and is provided with a waist-shaped hole exposing the welding seam, and the two ends of the Z-shaped part are respectively provided with a front hook plate and a rear hook plate which cooperate with the front flange part and the rear flange part.

[0012] As preferred, the end clamping assembly comprises a cover which is nested with the clamping end plate, the edge of the cover is provided with at least three positioning rods which are slidingly inserted, the two ends of the positioning rods are connected with the supporting part and the clamping end plate, a spring which is nested with the positioning rod is arranged between the clamping end plate and the end part of the cover, the center of the cover is provided with a lead screw which is rotationally connected with the cover, the end part of the lead screw is provided with a rotating cover which is rotationally connected with a lip plate arranged on the supporting part.

[0013] As preferred, the lip plate is in a T-shaped structure, the inner side of the rotating cover is provided with an annular groove which cooperates with the lip plate, and the outer side of the rotating cover is provided with a plurality of uniformly distributed handle rings.

[0014] As preferred, the supporting part is provided with an annular supporting track at one end which is away from the end clamping assembly.

[0015] Compared with the prior art, the advantages and positive effects of the present application are that:

[0016] The EGR cooler assembly welding tool provided by the present application can pull apart and reduce the distance between the front clamping part and the rear clamping part along the horizontal direction of the clamping end plate, the pulling apart of the distance facilitates the placement of the shell of the EGR cooler and the heat exchange device inside the EGR cooler, the reduction of the distance can achieve the clamping purpose, the end clamping assembly can clamp the end shell, the welding seams of the EGR cooler can be completely butted and connected at one time, the welding seams are exposed in an open environment, which is beneficial to the welding operation. The device is reasonable in design, is beneficial to reducing welding errors, guarantees the welding quality, is relatively strong in speciality, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0018] Figure 1 The perspective view of the assembly and welding tool of the EGR cooler provided for the embodiment;

[0019] Figure 2 The front view of the assembly and welding tool of the EGR cooler provided for the embodiment;

[0020] Figure 3 The front view of the assembly and welding tool of the EGR cooler provided for the embodiment, which is turned over by 180°;

[0021] Figure 4 The perspective view of the assembly and welding tool of the EGR cooler provided for the embodiment, which is turned over by 180°;

[0022] Figure 5 The side view of the assembly and welding tool of the EGR cooler provided for the embodiment;

[0023] Figure 6 The sectional view of the assembly and welding tool of the EGR cooler provided for the embodiment in G-G direction;

[0024] Figure 7 The working drawing of the front clamp, the rear clamp and the positioning pull plate provided for the embodiment;

[0025] Figure 8 The perspective view of the front clamp provided for the embodiment;

[0026] Figure 9 The perspective view of the rear clamp provided for the embodiment;

[0027] Figure 10 The perspective view of the positioning pull plate provided for the embodiment;

[0028] Figure 11 The assembly drawing of the clamped end plate and the supporting part provided for the embodiment;

[0029] Figure 12 The schematic view of the weld distribution on the EGR cooler;

[0030] In the above drawings:

[0031] 1. Support component; 2. Clamping end plate; 21. Sliding port; 3. End clamping assembly; 31. Pressure cap; 32. Positioning rod; 33. Lead screw; 34. Rotating cover; 35. Lip plate; 36. Handle ring; 37. Spring; 4. Front clamping component; 41. Front support plate; 42. Front clamping plate; 421. Front vertical groove; 422. Front plate hole; 423. Upper limit plate; 43. Front rib plate; 44. Front folding plate; 5. Rear clamping component Components; 51. Rear support plate; 52. Rear mounting clamp plate; 521. Rear vertical groove; 522. Rear plate hole; 523. Lower limit plate; 53. Rear rib plate; 54. Rear folding plate; 6. Positioning pull plate; 61. Z-shaped part; 62. Waist-shaped hole; 63. Front hook plate; 64. Rear hook plate; 7. Circular support rail; 8. Positioning plug cover; 81. Slot; 82. Positioning socket; 83. Positioning key; 84. Holding protrusion; 9. Weld. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0034] Examples, such as Figures 1-12 As shown, the assembly and welding fixture for the EGR cooler provided by this invention includes two relatively distributed support components 1. Two clamping end plates 2, corresponding one-to-one with the two support components 1, are arranged between the two support components 1. A set of end clamping assemblies 3 is arranged between the clamping end plates 2 and the support components 1. The end clamping assemblies 3 are used to clamp the end shell of the EGR cooler. A front clamping member 4 and a rear clamping member 5, arranged front-to-back and staggered vertically, are arranged between the two clamping end plates 2. The front clamping member 4 and the rear clamping member 5 are used to clamp the middle half shell of the EGR cooler. After clamping and positioning, the clamping end plates 2, the front clamping member 4, and the rear clamping member 5 form an open weld space. The open weld space includes the weld area between the end shell and the middle half shell, and the butt weld area between the two middle half shells. The weld 9 is as follows... Figure 12 As shown. Support component 1 is used to mount the device onto the welding frame in the workshop. Support component 1 can be rotated and positioned connected to the welding frame. The two support components 1 provide a mounting and support base for the end clamping assembly 3, the clamping end plate 2, and the front clamping component 4 and the rear clamping component 5.

[0035] Specifically, the front clamping piece 4 and the rear clamping piece 5 can be pulled apart and narrowed in the horizontal direction of the clamping end plate 2, and the pulling apart facilitates the placement of the shell of the EGR cooler and the heat exchange device inside the EGR cooler; the narrowing achieves the clamping purpose, and the end clamping assembly 3 clamps the end shell, and the welding of the welds of the EGR cooler can be completed at one time. Further, after the clamping is completed, the open welding space exposes the welding seam area of the end shell and the middle half shell and the butt welding seam area of the two middle half shells in an open environment, and especially the staggered distribution of the front clamping piece 4 and the rear clamping piece 5 allows sufficient operation space for the welding gun to weld the butt welding seam area of the two middle half shells, and the front clamping piece 4 and the rear clamping piece 5 also allow sufficient operation space for the welding gun to weld the welding seam area of the end shell and the middle half shell. Therefore, the device is beneficial to welding operation, reduces welding error, and ensures welding quality by providing a special tool for the EGR cooler.

[0036] As shown in Figure 7 and Figure 8 , in order to improve the clamping cooperation effect of the front clamping piece 4 and the EGR cooler shell, the front clamping piece 4 provided by the application includes two front support plates 41 distributed opposite to each other and corresponding to the clamping end plate 2, two front clamping plates 42 are arranged between the front support plates 41, a front rib plate 43 is arranged between the front clamping plates 42, the front support plate 41, the front clamping plate 42 and the front rib plate 43 are welded into one body, a handle hole for manually pulling the front clamping piece 4 is arranged on the front rib plate 43, the front clamping plate 42 includes a front vertical groove part 421, the groove back of the front vertical groove part 421 faces the rear clamping piece 5, a vertical long strip-shaped front plate hole 422 is arranged on the groove surface of the front vertical groove part 421, an upper limiting plate 423 is arranged on the top of the groove back of the front vertical groove part 421, and the length of the upper limiting plate 423 is less than the width of the middle half shell. Among them, the front vertical groove part 421 is used to directly contact the middle half shell of the EGR cooler shell, and the front plate hole 422 thereof leaves a clamping site for the pipe opening on the EGR cooler shell, so that the front clamping piece 4 can better clamp the middle half shell; on the one hand, the upper limiting plate 423 can establish a certain area of support relationship with the middle half shell, and on the other hand, the length design can make the welding seam of the middle half shell completely exposed, which is beneficial to improve the welding continuity of the welding gun to the welding seam of the middle half shell; the front support plate 41 pulls apart the front vertical groove part 421 and the clamping end plate 2, and leaves sufficient operation space for the welding gun to weld the welding seam area of the end shell and the middle half shell, and through the rotation of the rotating support part 1, the welding gun can be relatively continuously welded to the welding seam, thereby ensuring the quality and welding efficiency of the welding seam area of the end shell and the middle half shell.

[0037] As shown in Figure 7 and Figure 9As shown in the drawings, in order to improve the clamping effect of the rear clamping piece 5 and the EGR cooler shell, the rear clamping piece 5 provided by the present application comprises two rear support plates 51 distributed oppositely and matched with the clamping end plate 2 one by one, two rear clamping plates 52 are arranged between the rear support plates 51, a rear rib plate 53 is arranged between the rear clamping plates 52, the rear support plate 51, the rear clamping plate 52 and the rear rib plate 53 are welded into one body, a handle hole for manually moving the rear clamping piece 5 is arranged on the rear rib plate 53, the rear clamping plate 52 comprises a rear vertical groove part 521, the groove back of the rear vertical groove part 521 faces the rear clamping piece 5, a vertical long strip-shaped rear plate hole 522 is arranged on the groove surface of the rear vertical groove part 521, a lower limiting plate 523 is arranged at the bottom of the groove back of the rear vertical groove part 521, and the length of the lower limiting plate 523 is less than the width of the middle half shell. Among them, the rear vertical groove part 521 is used for directly contacting the middle half shell of the EGR cooler shell, and the rear plate hole 522 thereof leaves a clamping site for the pipe opening on the EGR cooler shell, so that the rear clamping piece 5 can better clamp the middle half shell; the lower limiting plate 523 can establish a certain area of support relationship with the middle half shell, and cooperates with the upper limiting plate 423 to complete the clamping of the EGR middle half shell, and on the other hand, the length design can make the weld of the middle half shell be completely exposed, which is beneficial to improve the welding continuity of the welding gun to the weld of the middle half shell; the rear support plate 51 pulls apart the rear vertical groove part 521 and the clamping end plate 2, and leaves sufficient operation space for the welding gun to weld the weld area of the end shell and the middle half shell, and through the rotary support part 1, the welding gun can be relatively continuously welded to the weld, thereby ensuring the quality and welding efficiency of the weld area of the end shell and the middle half shell.

[0038] As shown in the drawings, Figure 7 and Figure 11 As shown in the drawings, in order to improve the welding efficiency, the present application not only adopts the high-low staggered distribution mode for the front clamping piece 4 and the rear clamping piece 5, but also adopts the up-down staggered distribution design for the front support plate 41 and the rear support plate 51 provided by the present application, so that when the weld of the middle half shell is directly above, the exposed length of the weld of the end shell and the middle half shell is also the largest, which provides a relatively convenient space condition for the operation of the welding gun, the staff and the mechanical arm, thereby improving the welding efficiency and reducing the number and frequency of adjusting the specific angle of the device. Matchingly, the clamping end plate 2 provided by the present application is provided with four symmetrically distributed sliding holes 21, the sliding holes 21 are horizontally slidably matched with the front support plate 41 and the rear support plate 51, and the front support plate 41 and the rear support plate 51 are both T-shaped rib plates. The sliding holes 21 matched with the front support plate 41 and the rear support plate 51 are diagonally distributed, and the end plate parts of the two are tightly attached to the surface of the clamping end plate 2, which on the one hand can match the structural features of the front vertical groove part 421 and the rear vertical groove part 521, and on the other hand is beneficial to improve the uniformity of the stress of the EGR cooler clamped and fixed on the clamping end plate 2, especially when the center of gravity changes in the overturning process of the EGR cooler.

[0039] As Figure 4 and Figure 11 shown, in order to fix the front clamp 4 and the rear clamp 5, the present application provides that both sides of the clamping end plate 2 are provided with a positioning plug cover 8, the positioning plug cover 8 is provided with a plug slot 81 matched with the circumferential part of the clamping end plate 2, the plug slot 81 is provided with a positioning plug opening 82 matched with the front support plate 41 and the rear support plate 51 at the position close to one end thereof, and the plug slot 81 is provided with a positioning key 83 at the position close to the other end thereof, the positioning key 83 is inserted and matched with the sliding opening 21, the outer wall edge of the positioning plug cover 8 is provided with a holding protrusion 84 for hand holding, and forcibly pulling the holding protrusion 84 can be used to separate the positioning plug cover 8 from the clamping end plate 2. Among them, the sliding opening 21 of the clamping end plate 2 provides a horizontal adjustment margin for the front clamp 4 and the rear clamp 5, by tightly inserting the positioning plug cover 8 on the clamping end plate 2, the slot wall of the plug slot 81 is tightly matched with the plate surface of the clamping end plate 2, the positioning plug opening 82 is tightly pressed against the front support plate 41 and the rear support plate 51, and the positioning key 83 increases the force receiving node and the force receiving area of the positioning plug cover 8 and the clamping end plate 2, so as to ensure the positioning effect of the positioning plug cover 8 on the clamping end plate 2, the front clamp 4 and the rear clamp 5. It should be noted that in the application of the device to large specification EGR coolers, at least one screw can be provided on the edge of the positioning plug cover 8 for quick connection and fixation.

[0040] As Figure 7 shown, in order to improve the clamping quality of the front clamp 4 and the rear clamp 5 on the EGR cooler, the present application provides that the groove back bottom of the front clamping plate 42 is provided with a front folding plate part 44, which is first bent and extended upward and then in the direction of the groove opening of the front clamping plate 42, the groove back bottom of the rear vertical groove part 521 is provided with a rear folding plate part 54, which is first bent and extended obliquely downward and then in the direction of the groove opening of the rear clamping plate 52, and the positioning pull plate 6 is arranged between the front clamp 4 and the rear clamp 5, which is used to control the up-down relative distance and the front-rear maximum distance of the front clamping plate 42 and the rear clamping plate 52. In this way, the positioning pull plate 6 is used to extend the support plane of the lower limiting plate 523 on one hand, which is convenient for preventing the intermediate half shell and the heat exchange device inside the intermediate half shell before complete clamping and fixation, and on the other hand, it further stabilizes the high-low staggered position of the front clamp 4 and the rear clamp 5, which is beneficial to ensure the welding quality.

[0041] As Figure 4 and Figure 10As shown, the positioning pull plate 6 provided by the present application comprises a Z-shaped part 61, the top surface of the Z-shaped part 61 is flush with the lower limiting plate 523, the middle of the Z-shaped part 61 is parallel to the inclined part of the rear folding plate and is provided with a waist-shaped hole 62 exposing the weld, and the two ends of the Z-shaped part 61 are respectively provided with a front hook plate 63 and a rear hook plate 64 matched with the front folding plate part 44 and the rear folding plate part 54. Among them, the upper and lower surfaces of the front hook plate 63 can be attached to the inner side of the front folding plate part 44, or a suspended design can be adopted, and the rear hook plate 64 is attached to the inner side of the rear folding plate part 54, thereby achieving the purpose of extending the supporting surface / clamping surface of the lower limiting plate 523. The horizontal matching direction of the front hook plate 63 and the front folding plate part 44, and the rear hook plate 64 and the rear folding plate part 54 has a certain allowance, so when the EGR cooler is installed, the front mounting clamp 4 and the rear mounting clamp 5 are appropriately pulled apart, not only the connection relationship is not completely separated, but also sufficient space for taking and placing can be left above the two. Furthermore, by translating the Z-shaped part 61, the axial position of the waist-shaped hole 62 can be adjusted, and when welded to the corresponding area, the weld can be left out by quickly moving the positioning pull plate 6, thereby ensuring the continuity of the weld, ensuring the welding quality and improving the welding efficiency.

[0042] As shown in Figure 1 , Figure 5 and Figure 6 , in order to improve the clamping efficiency of the end shell of the disassembled EGR cooler, the end clamping assembly 3 provided by the present application comprises a gland 31 nested with the clamping end plate 2, the edge of the gland 31 is provided with at least three positioning rods 32 slidingly connected therewith, the two ends of the positioning rod 32 are connected with the supporting part 1 and the clamping end plate 2, the spring 37 nested with the positioning rod 32 is arranged between the clamping end plate 2 and the end of the gland 31, the center of the gland 31 is provided with a lead screw 33 rotationally matched therewith, the end of the lead screw 33 is provided with a rotating cover 34, and the rotating cover 34 is rotationally matched with the lip plate 35 arranged on the supporting part 1. Among them, the spring 37 can improve the stability of the relative rotation action of the lead screw 33 and the gland 31. By controlling the rotating cover 34 to rotate, the lead screw 33 and the gland 31 produce a relative rotating action, and the rotating pair processed by the gland 31 and the lead screw 33 can be converted into the axial movement of the gland 31, thereby achieving the purpose of pressing and loosening the end shell and the middle half shell.

[0043] Further, the lip plate 35 is in a T-shaped structure, the inner side of the rotating cover 34 is provided with an annular groove matched with the lip plate 35, and the outer side of the rotating cover 34 is provided with a plurality of uniformly distributed handle rings 36. Among them, the handle ring 36 provides a holding node for manually driving the rotating cover 34, and when the rotating cover 34 is matched with the lip plate 35 through the annular groove, it is beneficial to improve the stability of manually controlling and operating the end clamping assembly 3, and is beneficial to improve the clamping efficiency.

[0044] In order to improve the cooperation performance of the support component 1 and the welding frame of the workshop, the support component 1 is provided with a ring-shaped support track 7 at one end of the clamping assembly 3 at the back end, the welding frame is provided with a support ring and a bearing matched with the ring-shaped support track 7, the support ring is provided with a positioning pin capable of being positioned to match the ring-shaped support track 7, and the stability of the whole device in the welding process is ensured. The specific angle of the support component 1 can be adjusted by a power component, or the adjustment can be realized in a manual driving mode.

[0045] The above is only the preferred embodiment of the present application, and is not intended to limit the present application in other forms. Any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above embodiments still belongs to the protection scope of the technical scheme of the present application.

Claims

1. An assembly welding fixture for an EGR cooler comprising two oppositely distributed support members, characterized in that, Two clamping end plates, each corresponding to one of the two supporting components, are disposed between the two supporting components. A set of end clamping assemblies is disposed between the clamping end plates and the supporting components. These end clamping assemblies are used to clamp the end shell of the EGR cooler. Front and rear clamping members, distributed front-to-back and staggered vertically, are disposed between the two clamping end plates. These front and rear clamping members are used to clamp the middle half shell of the EGR cooler. After clamping and positioning, the clamping end plates, front clamping members, and rear clamping members form an open weld space, which includes the end shell and the middle half shell. The weld area of ​​the semi-shell and the butt weld area of ​​the two intermediate semi-shells; the front clamping component includes two oppositely distributed front support plates that correspond one-to-one with the clamping end plates, two front clamping plates are arranged between the front support plates, and a front rib plate is arranged between the front clamping plates. The front support plates, front clamping plates, and front rib plates are welded together. The front clamping plate includes a front vertical groove, the back of the groove of the front vertical groove faces the rear clamping component, and a vertically elongated front plate hole is provided on the groove surface of the front vertical groove. An upper limit plate is provided at the top of the back of the groove of the front vertical groove, and the length of the upper limit plate is less than that of the intermediate semi-shells. The width of the rear clamping member includes two relatively distributed rear support plates that correspond one-to-one with the clamping end plates. Two rear clamping plates are arranged between the rear support plates, and a rear rib plate is arranged between the rear clamping plates. The rear support plates, rear clamping plates, and rear rib plate are welded together. The rear clamping plate includes a rear vertical groove, with the back side of the groove facing the front clamping member. A vertically elongated rear plate hole is provided on the groove surface of the rear vertical groove. A lower limiting plate is provided at the bottom of the back side of the groove, and the length of the lower limiting plate is less than the width of the middle half-shell. The front support plate and the rear support plate are staggered vertically. The clamping end plate has four symmetrically distributed sliding openings in pairs. These sliding openings slide horizontally with the front support plate and the rear support plate, both of which are T-shaped ribs. Positioning covers are provided on both sides of the clamping end plate. Each positioning cover has a slot that mates with the circumference of the clamping end plate. Near one end of each slot is a positioning insertion port that mates with the front and rear support plates. Near the other end of each slot is a positioning key that engages with the sliding port. The outer edge of the positioning cover has a handle protrusion for gripping.

2. The EGR cooler assembly welding fixture of claim 1, wherein, The bottom of the back side of the front mounting plate is provided with a front folding plate, which bends upward and then extends towards the groove of the front mounting plate. The bottom of the back side of the rear mounting plate is provided with a rear folding plate, which bends downward and then extends towards the groove of the rear mounting plate. A positioning pull plate is provided between the front mounting plate and the rear mounting plate. The positioning pull plate is used to control the vertical relative distance and the maximum front-to-back distance between the front mounting plate and the rear mounting plate.

3. The assembly and welding fixture for the EGR cooler according to claim 2, characterized in that, The positioning pull plate includes a Z-shaped part, the top surface of which is flush with the lower limit plate. The middle part of the Z-shaped part is parallel to the inclined part of the rear folding plate and is provided with a waist-shaped hole that exposes the weld. The two ends of the Z-shaped part are respectively provided with a front hook plate and a rear hook plate that cooperate with the front folding plate and the rear folding plate.

4. The assembly and welding fixture for the EGR cooler according to claim 1, characterized in that, The end clamping assembly includes a pressure cap that nests with the clamping end plate. The edge of the pressure cap is provided with at least three positioning rods that slide and insert therewith. The two ends of the positioning rods are connected to the support component and the clamping end plate. A spring that nests with the positioning rods is provided between the clamping end plate and the end of the pressure cap. A lead screw that rotates with the pressure cap is provided at the center of the pressure cap. A rotating cover is provided at the end of the lead screw. The rotating cover rotates with a lip plate provided on the support component.

5. The assembly and welding fixture for the EGR cooler according to claim 4, characterized in that, The lip plate has a T-shaped structure, and the inner side of the rotating cover is provided with an annular groove that mates with the lip plate. The outer side of the rotating cover is provided with multiple evenly distributed handle rings.

6. The assembly and welding fixture for the EGR cooler according to claim 1, characterized in that, The support component has an annular support track at one end of its rear end clamping assembly.

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