A frame crossbeam assembly and welding method thereof

Abstract

The present invention provides a vehicle frame crossbeam assembly and a welding method thereof. The vehicle frame crossbeam assembly comprises a beam body assembly, a left support frame and a right support frame. The beam body assembly comprises a bottom plate, a front plate, a rear plate, a left end cover and a right end cover. The front plate and the rear plate are arranged on both sides of the bottom plate in the front-back direction. The rear plate comprises a top wall portion, a first side wall portion and a second side wall portion. The top wall portion is arranged between the first side wall portion and the second side wall portion. The top wall portion is located above the bottom plate. The second side wall portion is connected to the front plate. The two ends of the front plate are respectively provided with a first protrusion portion and a second protrusion portion. The left end cover and the right end cover are arranged at the two ends of the bottom plate in the left-right direction. In the vertical direction, the first protrusion portion and the second protrusion portion are both higher than the top wall portion. The upper parts of the left end cover and the right end cover are both higher than the top wall portion. The left support frame is arranged on the left end of the top wall portion, and the right support frame is arranged on the right end of the top wall portion. The present invention can reduce the height of the automobile frame and improve the structural strength and safety.

Description

Technical Field

[0001] The invention relates to the field of automobile frames, and in particular to a frame crossbeam assembly and a welding method thereof. Background Art

[0002] In recent years, with the development of economy, there are more and more private cars in cities, which has caused increasingly serious road congestion and environmental pollution. At present, the simplest and most economical way to effectively alleviate traffic pressure and facilitate passengers' travel is to vigorously develop public transportation. Compared with other means of transportation, buses have two main advantages: one is large passenger capacity and low cost; the other is that they can use existing road facilities, so buses have received a lot of attention in recent years. Buses are divided into fuel buses and electric buses. Electric buses use electricity as a power source, which is conducive to reducing pollution to the environment.

[0003] The current electric passenger vehicle frame generally includes a front frame, a middle frame and a rear frame, and a crossbeam assembly and a rear wheel arch baffle are arranged at the front end of the rear frame. The existing crossbeam assembly is generally made of tubular parts, and the rear wheel arch baffle is directly welded to the crossbeam assembly. Although the welding process is simple, in order to match the height setting of the rear wheel, the crossbeam assembly and the rear wheel arch baffle are generally relatively high from the ground, which is not conducive to meeting the requirements of the low-floor specifications of urban passenger transportation, and raises the center of gravity of the electric passenger vehicle, greatly reducing the safety of the vehicle. Summary of the invention

[0004] The first object of the present invention is to provide a frame crossbeam assembly which can reduce the height of an automobile frame and improve the structural strength and safety.

[0005] A second object of the present invention is to provide a welding method for a vehicle frame crossbeam assembly that can be quickly installed and positioned, facilitates subsequent welding, and improves welding efficiency.

[0006] In order to achieve the above-mentioned first purpose, the present invention provides a frame crossbeam assembly, including a beam body assembly, a left support frame and a right support frame, the beam body assembly includes a bottom plate, a front plate, a rear plate, a left end cover and a right end cover, the front plate and the rear plate are arranged on both sides of the bottom plate along the front-to-back direction, the rear plate includes a top wall portion, a first side wall portion and a second side wall portion, the top wall portion is arranged between the first side wall portion and the second side wall portion, the top wall portion is located above the bottom plate, the second side wall portion is connected to the front plate, and the two ends of the front plate are respectively provided with a first protrusion portion and a second protrusion portion, in the vertical direction, the first protrusion portion and the second protrusion portion are both higher than the top wall portion, the left end cover and the right end cover are arranged at the two ends of the bottom plate along the left-to-right direction, and in the vertical direction, the upper parts of the left end cover and the right end cover are both higher than the top wall portion; the left support frame is arranged on the left end of the top wall portion, and the left support portion is fixedly connected to the first protrusion portion and the left end cover respectively; the right support frame is arranged on the right end of the top wall portion, and the right support frame is fixedly connected to the second protrusion portion and the right end cover respectively.

[0007] It can be seen from the above scheme that a tubular crossbeam assembly is formed by enclosing the bottom plate, the front plate and the rear plate, and a left support frame and a right support frame are arranged on the crossbeam assembly, and the rear wheel arch baffle is arranged on the left support frame and the right support frame, so as to facilitate lowering the height of the bottom frame while coordinating the height of the rear wheel, which is beneficial to lowering the center of gravity of the car and improving its safety; by arranging the first protrusion and the second protrusion on the front plate to be higher than the top wall of the rear plate, and at the same time arranging the upper parts of the left and right end covers to be higher than the top wall of the rear plate, it is convenient to fix the left and right support frames from multiple sides, and it is convenient to improve the connection strength of the left and right support frames, so as to improve the structural strength of the entire crossbeam assembly.

[0008] A further solution is that the top wall portion is sequentially provided with a first position notch and a second position notch along its extension direction, and the first side wall portion is arranged with a first side notch, a second side notch, a third side notch and a fourth side notch along its extension direction, the first side notch and the second side notch are located on the left and right sides of the first position notch, and the third side notch and the fourth side notch are located on the left and right sides of the second position notch.

[0009] It can be seen from the above scheme that by setting notches on the rear plate, the subsequent rapid positioning of the left and right support frames is facilitated. Compared with the method of positioning by measuring the specific position and size of each part by measuring tools in the existing welding process, it has the advantages of saving time and improving welding efficiency.

[0010] A further solution is that the left end cover is provided with a left front plate notch, a left rear plate notch and a left first fixed plate notch, and the left rear plate notch is located between the left front plate notch and the left first fixed plate notch; the right end cover is provided with a right front plate notch, a right rear plate notch and a right first fixed plate notch, and the right rear plate notch is located between the right front plate notch and the right first fixed plate notch.

[0011] It can be seen from the above scheme that by respectively setting a plurality of notches on the left and right end covers, it is convenient to quickly position the respective ends of the subsequent front plate and the rear plate, which can not only save time and improve welding efficiency, but also simply verify whether the beam assembly is deformed. If deformation occurs, by adjusting the ends of the beam assembly to correspond to the notches, it is helpful to correct the deformation of the beam assembly and ensure the quality of the beam assembly.

[0012] A further solution is that the left supporting frame includes a left fixed seat, a left first fixed plate, a left second fixed plate, a left third fixed plate, a left fourth fixed plate and a left top plate, the left first fixed seat and the left second fixed plate are arranged in sequence along the left-to-right direction, the left fixed seat is arranged on the top wall portion, the left first fixed plate and the left second fixed plate are respectively fixedly connected to the first side wall portion; the left first fixed plate, the left third fixed plate and the left fourth fixed plate are arranged in the front-to-back direction, the left third fixed plate is inclined along the left-to-right direction, the two ends of the left third fixed plate extend toward the first protrusion and the left end cover respectively, the left fourth fixed plate is arranged on the left third fixed plate and extends back to the left first fixed plate; the left top plate is arranged above the left first fixed plate, the left second fixed plate, the left third fixed plate, the left fourth fixed plate and the first protrusion.

[0013] A further solution is that a first positioning hole is provided at the left end of the top wall, a first positioning protrusion is provided on the bottom wall of the left third fixing plate, and the first positioning protrusion is provided in the first positioning hole; a second positioning hole is provided on the left top plate, a second positioning protrusion is provided on the top wall of the left third fixing plate, and the second positioning protrusion is provided in the second positioning hole.

[0014] It can be seen from the above scheme that by setting the first positioning hole and the first positioning protrusion for clamping, there is no need to set up an additional fixing component to fix the left third fixing plate, which is conducive to the rapid positioning of the left third fixing plate and the top wall, and can prevent the left third fixing plate from being shifted during the welding process, thereby improving the welding quality of the two.

[0015] A further solution is that the right supporting frame includes a right fixed seat, a right first fixed plate, a right second fixed plate and a right top plate, and the right first fixed plate, the right fixed seat and the right second fixed plate are arranged in sequence along the left-right direction, the right fixed seat is arranged on the top wall portion, and the right first fixed plate and the right second fixed plate are respectively fixedly connected to the first side wall portion; the right top plate is arranged above the right first fixed plate, the right fixed seat, the right second fixed plate and the second protrusion.

[0016] In order to achieve the above-mentioned second purpose, the present invention provides a welding method for a frame crossbeam assembly, comprising the following steps: fixing a bottom plate, a left end cover and a right end cover on a fixture, and welding and fixing the bottom plate, the left end cover and the right end cover; fixing a rear plate on the bottom plate and between the left end cover and the right end cover, so that the two ends of the rear plate are respectively arranged along the left rear plate notch of the left end cover and the right rear plate notch of the right end cover, and welding and fixing the rear plate, the bottom plate, the left end cover and the right end cover; fixing a front plate on the bottom plate and between the left end cover and the right end cover, so that the two ends of the front plate are respectively arranged along the left front plate notch of the left end cover and the right front plate notch of the right end cover, and welding and fixing the front plate, the bottom plate, the rear plate, the left end cover and the right end cover; fixing a left support frame and a right support frame on the top wall of the rear plate, and welding and fixing them respectively.

[0017] It can be seen from the above scheme that by arranging the ends of the rear plate and the front plate along the corresponding notches respectively, it is beneficial to improve the rapid positioning between the various components. Compared with the method of determining the installation position of each part by measuring tools in the prior art, it has the advantages of saving time and improving welding efficiency.

[0018] A further solution is that the left support frame is fixedly placed on the top wall of the rear plate and welded and fixed, including the following steps: the left fixing seat is fixedly arranged on the top wall along the first position notch, and the left fixing seat, the first protrusion of the front plate and the top wall are welded and fixed; the left first fixing plate is fixedly placed on the first side wall of the rear plate along the first side notch, and arranged along the left first fixing plate notch of the left end cover, the left second fixing plate is fixedly placed on the first side wall along the second side notch, and the left first fixing plate, the left second fixing plate, the left fixing seat, the left end cover and the top wall are welded and fixed; the left third fixing plate is fixedly placed on the first side wall along the first side notch, and the left first fixing plate, the left second fixing plate, the left fixing seat, the left end cover and the top wall are welded and fixed; the left third fixing plate is fixedly placed on the first side wall of the rear plate .... and the left fourth fixing plate is fixedly placed on the top wall portion, so that the first positioning protrusion of the left third fixing plate is embedded in the first positioning hole of the top wall portion, the left fourth fixing plate is arranged along the left fourth fixing plate notch on the left third fixing plate, and the left third fixing plate, the left fourth fixing plate, the left end cover and the top wall portion are welded and fixed; the left top plate is fixedly placed above the left third fixing plate, the left first fixing plate, the left fixing seat, the left second fixing plate and the first protrusion, so that the second positioning protrusion of the left third fixing plate is embedded in the second positioning hole of the left top plate, and the left top plate, the left first fixing plate, the left fixing seat and the left second fixing plate are welded and fixed.

[0019] A further solution is that the right support frame is fixedly placed on the top wall of the rear plate and welded to fix it, including the following steps: the right fixed seat is fixedly placed on the top wall along the second position notch, and the right fixed seat, the second protrusion of the front plate and the top wall are welded to fix them; the right first fixed plate is fixedly placed on the first side wall of the rear plate along the fourth side notch and arranged along the right first fixed plate notch of the right end cover, the right second fixed plate is fixedly placed on the first side wall along the third side notch, and the right first fixed plate, the right second fixed plate, the right fixed seat, the right end cover and the top wall are welded to fix them; the right top plate is fixedly placed above the right first fixed plate, the right fixed seat and the right second fixed plate, and the right top plate, the right first fixed plate, the right fixed seat and the right second fixed plate are welded to fix them. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of an embodiment of a vehicle frame crossbeam assembly of the present invention.

[0021] Figure 2 2 is an exploded view of an embodiment of a frame cross member assembly of the present invention.

[0022] Figure 3 It is an exploded view of the beam body assembly in the embodiment of the frame cross beam assembly of the present invention.

[0023] Figure 4It is an exploded view of the left support frame in the embodiment of the frame crossbeam assembly of the present invention.

[0024] Figure 5 It is an exploded view of the right support frame in the embodiment of the frame crossbeam assembly of the present invention.

[0025] Figure 6 It is a structural schematic diagram of step one in the welding method of the present invention.

[0026] Figure 7 It is a structural schematic diagram of step two in the welding method of the present invention.

[0027] Figure 8 It is a structural schematic diagram of step three in the welding method of the present invention.

[0028] Fig. 9 It is a structural schematic diagram of step four in the welding method of the present invention.

[0029] Fig.10 yes Fig. 9 A partial enlarged view of point A in the middle.

[0030] Fig.11 It is a structural schematic diagram of the first viewing angle in step five of the welding method of the present invention.

[0031] Fig.12 It is a structural schematic diagram of the second viewing angle in step five of the welding method of the present invention.

[0032] Fig.13 It is a structural schematic diagram of step six in the welding method of the present invention.

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0034] Frame cross member assembly embodiment

[0035] See also Figure 1 and Figure 2 The frame crossbeam assembly includes a beam body assembly 1, a left support frame 2 and a right support frame 3. The left support frame is arranged at the left end of the beam body assembly 1, and the right support frame 3 is arranged at the right end of the beam body assembly 1.

[0036] See also Figure 3 , and combined with Figure 2 The beam assembly 1 includes a bottom plate 11, a front plate 12, a rear plate 13, a left end cover 14 and a right end cover 15. The front plate 12 and the rear plate 13 are arranged on both sides of the bottom plate 11 along the front-to-back direction, and the left end cover 14 and the right end cover 15 are arranged on both ends of the bottom plate 11 along the left-to-right direction. The front-to-back direction described in this embodiment refers to the front-to-back direction of the frame when the frame crossbeam assembly is installed on the frame, specifically, the end toward the front of the vehicle is the front, and the end toward the rear of the vehicle is the rear.

[0037] The bottom plate 11 includes a flat plate section 111, a left inclined plate section 112 and a right inclined plate section 113. The flat plate section 111 is arranged between the left inclined plate section 112 and the right inclined plate section 113. The left inclined plate section 112 is inclined from top to bottom toward the flat plate section 111, and the right inclined plate section 113 is inclined from top to bottom toward the flat plate section 111. A first small flat plate section 114 is arranged at one end of the left inclined plate section 112 away from the flat plate section 111, and a second small flat plate section 115 is arranged at one end of the right inclined plate section 113 away from the flat plate section 111. The first small flat plate section 114 and the second small flat plate section 115 are parallel to the flat plate section 111, respectively.

[0038] The rear plate 13 includes a top wall portion 131, a first side wall portion 132 and a second side wall portion 133. The top wall portion 131 is vertically arranged between the first side wall portion 132 and the second side wall portion 133. The first side wall portion 132 and the second side wall portion 133 extend downward from the surface of the top wall portion 131 respectively. The downward extension distance of the first side wall portion 132 is greater than the downward extension distance of the second side wall portion 133. The lower edge of the first side wall portion 132 is flush with the flat plate section 111, the left inclined plate section 112 and the right inclined plate section 113 respectively. The top wall portion 131 is located directly above the bottom plate 11, and the second side wall portion 133 is welded and fixed to the front plate 12. The left and right ends of the front plate 12 are respectively provided with a first protrusion 121 and a second protrusion 122, and the first protrusion 121 and the second protrusion 122 are respectively formed integrally with the front plate 12. In the vertical direction, the first protrusion 121 and the second protrusion 122 are both higher than the top wall 131 , and the first protrusion 121 and the second protrusion 122 have the same height.

[0039] The top wall portion 131 is provided with a first position notch 1311 and a second position notch 1312 in sequence along its extension direction, and the first side wall portion 132 is provided with a first side notch 1321, a second side notch 1322, a third side notch 1323 and a fourth side notch 1324 along its extension direction. The first side notch 1321 and the second side notch 1322 are located on the left and right sides of the first position notch 1311, and the third side notch 1323 and the fourth side notch 1324 are located on the left and right sides of the second position notch 1312. All of the above notches are carved on the surface of the rear plate 13 by laser cutting. In the production process of the rear plate 13, processes such as blanking, punching and bending are required. The notches can be processed together with multiple hole positions in the punching process to avoid adding unnecessary processes, save time and improve efficiency.

[0040] The bottom wall of the left end cover 14 is welded and fixed to the bottom surface of the first small flat plate section 114, and the bottom wall of the right end cover 15 is welded and fixed to the bottom surface of the second small flat plate section 115. In the vertical direction, the upper part of the left end cover 14 and the upper part of the right end cover 15 are both higher than the top wall 131, and the upper part of the right end cover 15 is slightly higher than the height of the second protrusion 122. The inner side of the side wall of the left end cover 14 is provided with a left front plate notch 141, a left rear plate notch 142 and a left first fixed plate notch 143, and the left rear plate notch 142 is located between the left front plate notch 141 and the left first fixed plate notch 143. The shape of the left front plate notch 141 matches the end face profile of the left end of the front plate 12, and the shape of the left rear plate notch 142 matches the end face profile of the left end of the rear plate 13. All of the above notches are engraved on the surface of the left end cover 14 by laser cutting.

[0041] The inner side of the side wall of the right end cover 15 is provided with a right front plate notch 151, a right rear plate notch 152 and a right first fixed plate notch 153, and the right rear plate notch 152 is located between the right front plate notch 151 and the right first fixed plate notch 153. The shape of the right front plate notch 151 matches the end face profile of the right end of the front plate 12, and the shape of the right rear plate notch 152 matches the end face profile of the right end of the rear plate 13. All the above notches are carved on the surface of the right end cover 15 by laser cutting. All the above notches are carved on the surface of the right end cover 15 by laser cutting.

[0042] See also Figure 4 , and combined with Figure 3The left support frame 2 includes a left fixed seat 21, a left first fixed plate 22, a left second fixed plate 23, a left third fixed plate 24, a left fourth fixed plate 25 and a left top plate 26. The left first fixed plate 22, the left fixed seat 21 and the left second fixed plate 23 are arranged in sequence along the left-right direction, and the left fixed seat 21 is arranged on the top wall portion 131 along the first position notch 1311. The left fixed seat 21 is arranged to be approximately "n"-shaped, and the left fixed seat 21 includes a top arm 211 and two support arms 212, and the two support arms 212 are vertically arranged on the left and right sides of the top arm 211. The bottom wall and the vertical wall of the support wall 212 are both provided with welding connection parts, and the welding connection parts are perpendicular to the surface of the support wall 212, so as to facilitate welding with the top wall portion 131 and the first protrusion 121 respectively. The support arm 212 is provided with a first mounting hole 213, and the first mounting hole 213 is located above the welding connection part, and the first mounting hole 213 extends along the left-right direction. The first left fixing plate 22 is arranged on the first side wall portion 132 along the first side notch 1321 and vertically protrudes upwards. A first bending portion 221 is arranged at the protruding portion of the first left fixing plate 22, and the first bending portion 221 is fixedly connected to one of the support arms 212 of the left fixing seat 21. A first through hole 222 is arranged on the first bending portion 221, and the first through hole 222 is coaxially arranged with the first mounting hole 213 and communicates with each other. The left end profile of the first left fixing plate 22 matches and is correspondingly arranged with the first left fixing plate notch 143. The second left fixing plate 23 is arranged on the first side wall along the second side notch 1322 and vertically protrudes upwards. A second bending portion 231 is arranged at the protruding portion of the second left fixing plate 23, and the second bending portion 231 is fixedly connected to the other support arm 212 of the left fixing seat 21. The second bending portion 231 is provided with a second through hole 232 , and the second through hole 232 and the first mounting hole 213 are coaxially disposed and communicated with each other.

[0043] The first left fixing plate 22, the third left fixing plate 24 and the fourth left fixing plate 25 are arranged in a row in the front-to-back direction. The third left fixing plate 24 is arranged obliquely in the left-to-right direction, and the two ends of the third left fixing plate 24 are respectively fixedly connected to the first protrusion 121 and the left end cover 14. The third left fixing plate 24 is provided with a fourth left fixing plate notch 243, one end of the fourth left fixing plate 25 is provided on the third left fixing plate 24 along the fourth left fixing plate notch 243, and the other end of the fourth left fixing plate 25 extends away from the first left fixing plate 22.

[0044] The left top plate 26 is arranged above the first left fixing plate 22, the second left fixing plate 23, the third left fixing plate 24, the fourth left fixing plate 25 and the first protrusion 121. The bottom wall of the third left fixing plate 24 is provided with two first positioning protrusions 241, and the two first positioning protrusions 241 are arranged along the inclined direction of the third left fixing plate 24. The top wall 131 of the rear plate 13 is provided with a first positioning hole 1313 that matches the first positioning protrusion 241. The first positioning protrusion 241 is inserted into the first positioning hole 1313, and the third left fixing plate 24 can be pre-positioned, so that when the third left fixing plate 24 is welded, no additional auxiliary positioning tool is required, which is conducive to improving the position accuracy of the third left fixing plate 24 and facilitating subsequent welding. The top wall of the third left fixing plate 24 is provided with two second positioning protrusions 242, and the two second positioning protrusions 242 are arranged along the inclined direction of the third left fixing plate 24. The left top plate 26 is provided with a second positioning hole 161 which cooperates with the second positioning protrusion 242. The second positioning protrusion 242 is arranged in the second positioning hole 161, which can quickly pre-position the left top plate 26, thereby improving the installation efficiency of the left top plate 26 and improving the positioning accuracy of the left top plate 26, thereby avoiding accidental position displacement of the left top plate during subsequent welding.

[0045] See also Figure 5 , and combined with Figure 3 The right support frame 3 includes a right fixed seat 31, a right first fixed plate 32, a right second fixed plate 33 and a right top plate 34. The right second fixed plate 33, the right fixed seat 31 and the right first fixed plate 32 are arranged in sequence along the left-right direction. The right fixed seat 31 is arranged on the top wall portion 131 along the second position notch 1312. The structure of the right fixed seat 31 is the same as that of the left fixed seat 21, which will not be repeated here. The right first fixed plate 32 is arranged on the first side wall portion 132 along the fourth side notch 1324 and protrudes vertically upward. A third bending portion 321 is arranged at the protruding position of the right first fixed plate 32. The third bending portion 321 is fixedly connected to the right side wall of the right fixed seat 31. The right end contour of the right first fixed plate 32 matches and is correspondingly arranged with the right first fixed plate notch 153. The right second fixing plate 33 is arranged on the first side wall portion 132 along the fourth side notch 1324 and vertically protrudes upwards. A fourth bending portion 331 is arranged at the protruding position of the right second fixing plate 33, and the fourth bending portion 331 is fixedly connected to the left side wall of the right fixing seat 31. A third through hole 322 is arranged on the third bending portion 321, and a fourth through hole 332 is arranged on the fourth bending portion 331. The third through hole 322 and the fourth through hole 332 are both arranged coaxially with the first mounting hole 311 on the right fixing seat 31. The right top plate 34 is arranged above the right first fixing plate 32, the right fixing seat 31, the right second fixing plate 33 and the second protruding portion 122 and fixed by welding.

[0046] The shapes of all the notches in this embodiment can be specifically set according to the contour of the corresponding sheet metal part, and can be specifically set to be a straight line, "L" shape, "n" shape, rectangular or polygonal, etc.

[0047] Embodiment of welding method of frame cross member assembly

[0048] The welding method of this embodiment requires the aid of a clamp 4, and the frame crossbeam assembly is welded on the clamp 4. The welding method includes the following steps 1 to 7.

[0049] Step 1:

[0050] Combination Figure 6 and Figure 3 , the bottom plate 11, the left end cover 14 and the right end cover 15 are fixedly placed on the positioning support surface corresponding to the fixture 4, and the bottom plate 11, the left end cover 14 and the right end cover 15 are welded and fixed.

[0051] Specifically, the flat plate segment 111 is first placed on the four horizontal positioning support blocks 41 in the middle of the clamp 4, and the displacement of the flat plate segment 111 in the front-to-back direction is limited by the inclined surfaces arranged on both sides of the horizontal positioning support blocks 41; then the left end cover 14 is arranged on the left end cover fixing seat 42 at the left end of the clamp 4, so as to limit the displacement of the left end cover 14 in the up-down and left-to-right directions, and the displacement of the left end cover 14 in the front-to-back direction is limited by the first stop block 421 arranged on one side of the left end cover fixing seat 42, and the height position of the left end cover 14 in the vertical direction is higher than the height position of the flat plate segment 111; then the left inclined plate segment 112 is tilted and placed between the left end cover 14 and the flat plate segment 111 and fixed by welding, so that the first end of the left inclined plate segment 112 is flush with the flat plate segment 111, and the second end of the left inclined plate segment 112 is flush with the flat plate segment 111. The first small flat plate segment 114 is overlapped on the bottom wall of the left end cover 14; then the right end cover 15 is set on the right end cover fixing seat 43 at the right end of the clamp 4, so as to limit the displacement of the right end cover 15 in the up and down and left and right directions, and limit the displacement of the right end cover 15 in the front and back directions by the second stop block set on one side of the right end cover fixing seat 43. In the vertical direction, the height position of the right end cover 15 is higher than the height position of the flat plate segment 111, and the first stop block 421 and the second stop block are both located on the same side of the bottom plate 11; then the right inclined plate segment 113 is tiltedly placed between the right end cover 15 and the flat plate segment 111 and fixed by welding, so that the first end of the right inclined plate segment 113 is flush with the flat plate segment 111, and the second end of the right inclined plate segment 113, i.e. the second small flat plate segment 115, is overlapped on the bottom wall of the right end cover 15.

[0052] Step 2:

[0053] Combination Figure 7 and Figure 3The rear plate 13 is fixedly placed on the bottom plate 11 and located between the left end cover 14 and the right end cover 15, so that the two ends of the rear plate 13 are arranged along the left rear plate notch 142 and the right rear plate notch 152 respectively, and the rear plate 13, the bottom plate 11, the left end cover 14 and the right end cover 15 are welded and fixed.

[0054] Specifically, the clamp 4 is provided with two rear plate fixing blocks 44 and two first lifting fixing seats 45 arranged in the left-right direction. The first side wall portion 132 of the rear plate 13 is adjacent to the rear plate fixing block 44, which plays a role in straightening the rear plate 13 to prevent the rear plate 13 from tilting in the vertical direction; the first lifting pressure head 451 of the first lifting fixing seat 45 is pressed on the top wall portion 131 of the rear plate 13 to fix the rear plate 13.

[0055] Step 3:

[0056] Combination Figure 8 and Figure 3 , place the front plate 12 on the bottom plate 11 and between the left end cover 14 and the right end cover 15, so that the two ends of the front plate 12 are arranged along the left front plate notch 141 and the right front plate notch 151 respectively, and weld the front plate 12, the rear plate 13, the left end cover 14 and the right end cover 15 to fix them.

[0057] Specifically, the fixture 4 is provided with two front plate fixing blocks 46 and three second lifting fixing seats 47 along the left-right direction, and the front plate 12 is adjacent to the front plate fixing blocks 46, so that the front plate 12 is closely fitted with the second side wall portion 133 of the rear plate 13. In the vertical direction, the second lifting and lowering heads 471 of the second lifting and lowering fixing seats 47 are respectively pressed on the first protrusion 121 and the second protrusion 122 of the front plate 12, so as to fix the front plate 12.

[0058] Step 4:

[0059] In this step, the left support frame 2 and the right support frame 3 can be welded to the top wall portion 131 at the same time, or the left support frame 2 and the right support frame 3 can be welded to the top wall portion 131 in sequence. The sequence of the left support frame 2 and the right support frame 3 is not limited. In this embodiment, the former is preferred.

[0060] Combination Fig. 9 , Fig.10 , Figure 4 and Figure 5 , place the left fixing seat 21 on the top wall portion 131 along the first position notch 1311 so that the left fixing seat 21 is adjacent to the first protrusion 121, and then fix the left fixing seat 21 through the first pin shaft positioning assembly 48 of the clamp 4 and weld it.

[0061] Specifically, the first pin shaft positioning assembly 48 includes a first positioning column 481 and two first positioning pins 482. The first positioning column 481 is provided with an annular flange 483 on both sides. The center of the annular flange 483 is provided with a second mounting hole. The annular flange 483 protrudes from the surface of the first positioning column 481. The first positioning pin 482 is detachably connected to the second mounting hole. The two annular flanges 483 are both located between the two support arms 212 of the left fixed seat 21, and the second mounting hole is coaxially arranged with the first mounting hole 213. The first positioning pin 482 passes through the first mounting hole 213 and is inserted into the second mounting hole of the annular flange 483 to realize the positioning of the left fixed seat 21 on the top wall 131. The first pin shaft positioning assembly 48 is provided to correct and maintain the distance between the two support arms 212 of the left fixed seat 21, and to avoid deformation of the left fixed seat 21, which affects the accuracy of the installation position of subsequent parts.

[0062] The right fixing seat 31 is placed on the top wall portion 131 along the second position notch 1312, so that the right fixing seat 31 is adjacent to the second protrusion 122, and then the right fixing seat 31 is fixed by the second pin shaft positioning assembly 49 of the clamp 4 and welded. The structure of the second pin shaft positioning assembly 49 is the same as that of the first pin shaft positioning assembly 48, and will not be repeated here.

[0063] Step 5:

[0064] Combination Fig.11 , Figure 3 and Figure 4 , overlap the first bent portion 221 of the left first fixing plate 22 on the bottom wall of the left fixing seat 21, and the first bent portion 221 is adjacent to the left side wall of the left fixing seat 21, and then adjust the position of the left first fixing plate 22 so that the left first fixing plate 22 is arranged along the first side notch 1321 and the left first fixing plate notch 143 at the same time. At this time, the first through hole 222 of the first bent portion 221 and the first mounting hole 213 of the left fixing seat 21 are coaxially arranged and connected to each other, and the first positioning pin 482 passes through the first through hole 222 and the first mounting hole 213 in sequence and is inserted into the second mounting hole to realize the positioning of the left first fixing plate 22. Then, the left first fixing plate 22, the left fixing seat 21, the first side wall portion 132 and the left end cover 14 are welded and fixed.

[0065] The second bent portion 231 of the second left fixing plate 23 is overlapped on the bottom wall of the left fixing seat 21, and the second bent portion 231 is adjacent to the right side plate of the left fixing seat 21, and then the position of the second left fixing plate 23 is adjusted so that the second left fixing plate 23 is arranged along the second side notch 1322. At this time, the second through hole 232 of the second bent portion 231 is coaxially arranged with the first mounting hole 213 of the left fixing seat 21 and is connected to each other, and the first positioning pin 482 passes through the second through hole 232 and the first mounting hole 213 in sequence and is inserted into the second mounting hole to realize the positioning of the second left fixing plate 23. Then the second left fixing plate 23, the left fixing seat 21 and the first side wall portion 132 are welded and fixed.

[0066] Combination Fig.12 , Figure 3 and Figure 4 , insert the first positioning protrusion 241 of the left third fixing plate 24 into the first positioning hole 1313 of the top wall 131, then set the left fourth fixing plate 25 on the top wall 131 and adjust the position of the left fourth fixing plate 25 so that the left fourth fixing plate 25 is arranged along the left fourth fixing plate notch 243. Then, the left third fixing plate 24, the left fourth fixing plate 25, the left end portion and the top wall 131 are welded and fixed.

[0067] Combination Fig.11 , Figure 3 and Figure 5 , overlap the third bent portion 321 of the right first fixing plate 32 on the bottom wall of the right fixing seat 31, and the third bent portion 321 is adjacent to the right side plate of the right fixing seat 31, and then adjust the position of the right first fixing plate 32 so that the right first fixing plate 32 is arranged along the fourth side notch 1324 and the right first fixing plate notch 153 at the same time. At this time, the third through hole 322 of the third bent portion 321 is coaxially arranged with the first mounting hole 213 of the right fixing seat 31, and the second positioning pin 491 of the second pin shaft positioning assembly 49 passes through the third through hole 322 and the first mounting hole 213 in sequence and is inserted into the second mounting hole of the second pin shaft positioning assembly 49 to realize the positioning of the right first fixing plate 32. Then, the right first fixing plate 32, the right fixing seat 31, the first side wall portion 132 and the right end cover 15 are welded and fixed.

[0068] The fourth bent portion 331 of the right second fixing plate 33 is overlapped on the bottom wall of the right fixing seat 31, and the fourth bent portion 331 is adjacent to the left side plate of the right fixing seat 31, and then the position of the right second fixing plate 33 is adjusted so that the right second fixing plate 33 is arranged along the third side notch 1323. At this time, the fourth through hole 332 of the fourth bent portion 331 is coaxially arranged with the first mounting hole 213 of the right fixing seat 31 and is connected to each other, and one side of the second positioning pin 491 of the second pin shaft positioning assembly 49 passes through the fourth through hole 332 and the first mounting hole 213 and is inserted into the second mounting hole to realize the positioning of the right second fixing plate 33. Then the right second fixing plate 33, the right fixing seat 31 and the second side wall portion 133 are welded and fixed.

[0069] Step 6:

[0070] Combination Fig.13 , Figure 4 and Figure 5 , the left top plate 26 is fixedly placed above the left third fixing plate 24, the left first fixing plate 22, the left fixing seat 21, the left second fixing plate 23 and the first protrusion 121, so that the second positioning protrusion 242 of the left third fixing plate 24 is embedded in the second positioning hole 161 of the left top plate 26, so as to realize the positioning of the left top plate 26. Then, the left top plate 26 is pressed by the third lifting and lowering head 40 of the clamp 4, and the left top plate 26, the left first fixing plate 22, the left fixing seat 21 and the left second fixing plate 23 are welded and fixed.

[0071] The right top plate 34 is fixedly placed above the right first fixing plate 32, the right fixing seat 31 and the right second fixing plate 33, and then the right top plate 34 is pressed simultaneously by the two fourth lifting and lowering heads 400 of the clamp 4, and the right top plate 34, the right first fixing plate 32, the right fixing seat 31 and the right second fixing plate 33 are welded and fixed.

[0072] Finally, the welded frame crossbeam assembly is removed from the fixture 4 .

[0073] In summary, the present invention forms a tubular member by enclosing a bottom plate, a front plate and a rear plate, and arranges a left support frame and a right support frame on the tubular member, so that the rear wheel arch baffle can be arranged on the left support frame and the right support frame, which is conducive to lowering the height of the bottom frame while matching the height of the rear wheel, and is conducive to lowering the center of gravity of the car and improving its safety. The present invention also arranges the first protrusion and the second protrusion on the front plate to be higher than the top wall of the rear plate, and arranges the upper parts of the left and right end covers to be higher than the top wall of the rear plate, so as to facilitate fixing the left and right support frames from the side, and to facilitate improving the connection strength of the left and right support frames, so as to improve the structural strength of the entire crossbeam assembly. The present invention also arranges the ends of the rear plate and the ends of the front plate along the corresponding notches, which is conducive to improving the rapid positioning between the various components. Compared with the method of determining the position of each component by various measuring tools in the prior art, the present invention has the advantages of saving time and improving efficiency.

[0074] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A frame crossbeam assembly, characterized in that: include: A beam body assembly, the beam body assembly comprising a bottom plate, a front plate, a rear plate, a left end cover and a right end cover, the front plate and the rear plate are arranged on both sides of the bottom plate along the front-rear direction, the bottom plate comprises a flat plate section, a left inclined plate section and a right inclined plate section, the left inclined plate section is provided with a first small flat plate section at one end away from the flat plate section, the right inclined plate section is provided with a second small flat plate section at one end away from the flat plate section, the rear plate comprises a top wall portion, a first side wall portion and a second side wall portion, the top wall portion is arranged between the first side wall portion and the second side wall portion, the first side wall portion extends downwardly for a distance greater than the The second side wall portion extends downwardly by a distance, the lower edges of the first side wall portion are respectively flush with the flat plate section, the left inclined plate section and the right inclined plate section, the top wall portion is located above the bottom plate, the second side wall portion is connected to the front plate, the two ends of the front plate are respectively provided with a first protrusion and a second protrusion, in the vertical direction, the first protrusion and the second protrusion are both higher than the top wall portion, the left end cover and the right end cover are arranged at the two ends of the bottom plate in the left-right direction, in the vertical direction, the upper parts of the left end cover and the right end cover are both higher than the top wall portion; A left support frame, the left support frame is arranged on the left end of the top wall portion, and the left support frame is fixedly connected to the first protrusion and the left end cover respectively; A right support frame, the right support frame is arranged on the right end of the top wall portion, and the right support frame is fixedly connected to the second protrusion and the right end cover respectively; The left supporting frame comprises a left fixing seat, a left first fixing plate, a left second fixing plate, a left third fixing plate, a left fourth fixing plate and a left top plate, the left first fixing plate, the left fixing seat and the left second fixing plate are sequentially arranged in the left-right direction, the left fixing seat is arranged on the top wall portion, the left first fixing plate and the left second fixing plate are respectively fixedly connected to the first side wall portion; the left first fixing plate, the left third fixing plate and the left fourth fixing plate are arranged in the front-to-back direction, the left third fixing plate is inclinedly arranged in the left-to-right direction, the two ends of the left third fixing plate extend toward the first protrusion and the left end cover respectively, and the left fourth fixing plate is arranged on the left third fixing plate and extends away from the left first fixing plate; The left top plate is arranged above the left first fixing plate, the left second fixing plate, the left third fixing plate, the left fourth fixing plate and the first protrusion; the left end of the top wall portion is provided with a first positioning hole, the bottom wall of the left third fixing plate is provided with a first positioning protrusion, the first positioning protrusion is arranged in the first positioning hole; the left top plate is provided with a second positioning hole, the top wall of the left third fixing plate is provided with a second positioning protrusion, and the second positioning protrusion is arranged in the second positioning hole; the right supporting frame comprises a right fixing seat, a right first fixing plate, a right second fixing plate and a right top plate, the right first fixing plate, the right fixing seat and the right second fixing plate are arranged in sequence along the left and right directions, the right fixing seat is arranged on the top wall portion, the right first fixing plate and the right second fixing plate are fixedly connected to the first side wall portion respectively; the right top plate is arranged above the right first fixing plate, the right fixing seat, the right second fixing plate and the second protrusion; The top wall portion is sequentially provided with a first position notch and a second position notch along its extension direction, the first side wall portion is arranged along its extension direction with a first side notch, a second side notch, a third side notch and a fourth side notch, the first side notch and the second side notch are located on the left and right sides of the first position notch, and the third side notch and the fourth side notch are located on the left and right sides of the second position notch; the left fixing seat is arranged on the top wall portion along the first position notch, and the right fixing seat is arranged on the top wall portion along the second position notch, the left end cover is provided with a left front plate notch, a left rear plate notch and a left first fixing plate notch, the left rear plate notch is located on the left between the left front plate notch and the left first fixed plate notch; the shape of the left front plate notch matches the end face contour of the left end of the front plate, and the shape of the left rear plate notch matches the end face contour of the left end of the rear plate; the right end cover is provided with a right front plate notch, a right rear plate notch and a right first fixed plate notch, and the right rear plate notch is located between the right front plate notch and the right first fixed plate notch; by respectively providing a plurality of notches on the left end cover and the right end cover, it is convenient to quickly position the respective ends of the subsequent front plate and the rear plate, the shape of the right front plate notch matches the end face contour of the right end of the front plate, and the shape of the right rear plate notch matches the end face contour of the right end of the rear plate.

2. A welding method for a frame crossbeam assembly, used for processing the frame crossbeam assembly as claimed in claim 1, characterized in that: The steps include: The bottom plate, the left end cover and the right end cover are fixedly placed on the fixture, and the bottom plate, the left end cover and the right end cover are fixed by welding; The rear plate is fixedly placed on the bottom plate and located between the left end cover and the right end cover, so that the two ends of the rear plate are arranged along the left rear plate notch of the left end cover and the right rear plate notch of the right end cover, respectively, and the rear plate, the bottom plate, the left end cover and the right end cover are fixed by welding; The front plate is fixedly placed on the bottom plate and located between the left end cover and the right end cover, so that the two ends of the front plate are arranged along the left front plate notch of the left end cover and the right front plate notch of the right end cover, and the front plate, the bottom plate, the rear plate, the left end cover and the right end cover are fixed by welding; The left support frame and the right support frame are respectively fixedly placed on the top wall of the rear plate and are respectively fixed by welding.

3. The welding method according to claim 2, characterized in that: The steps of fixing the left support frame on the top wall of the rear plate and welding the left support frame include the following steps: The left fixing seat is fixedly arranged on the top wall along the first position notch, and the left fixing seat, the first protruding portion of the front plate and the top wall are fixedly welded; The first left fixing plate is fixedly placed on the first side wall portion of the rear plate along the first side notch, and arranged along the first left fixing plate notch of the left end cover, the second left fixing plate is fixedly placed on the first side wall portion along the second side notch, and the first left fixing plate, the second left fixing plate, the left fixing seat, the left end cover and the top wall portion are welded and fixed; The left third fixing plate and the left fourth fixing plate are fixedly placed on the top wall portion, so that the first positioning protrusion of the left third fixing plate is embedded in the first positioning hole of the top wall portion, the left fourth fixing plate is arranged along the left fourth fixing plate notch on the left third fixing plate, and the left third fixing plate, the left fourth fixing plate, the left end cover and the top wall portion are welded and fixed; The left top plate is fixedly placed above the left third fixing plate, the left first fixing plate, the left fixing seat, the left second fixing plate and the first protrusion, so that the second positioning protrusion of the left third fixing plate is embedded in the second positioning hole of the left top plate, and the left top plate, the left first fixing plate, the left fixing seat and the left second fixing plate are welded and fixed.

4. The welding method according to claim 3, characterized in that: The steps of fixing the right support frame on the top wall of the rear plate and welding the frame include: The right fixing seat is fixedly placed on the top wall along the second position notch, and the right fixing seat, the second raised portion of the front plate and the top wall are fixedly welded; The first right fixing plate is fixedly placed on the first side wall portion of the rear plate along the fourth side notch and arranged along the first right fixing plate notch of the right end cover, the second right fixing plate is fixedly placed on the first side wall portion along the third side notch, and the first right fixing plate, the second right fixing plate, the right fixing seat, the right end cover and the top wall portion are welded and fixed; The right top plate is fixedly placed above the right first fixing plate, the right fixing seat and the right second fixing plate, and the right top plate, the right first fixing plate, the right fixing seat and the right second fixing plate are fixed by welding.

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