Welding fixing platform

Abstract

The utility model relates to the technical field of workpiece clamping, in particular to a welding fixing platform which comprises a bottom frame, a bottom supporting mechanism, a top pressing mechanism and a plurality of clamping assemblies, and the bottom supporting mechanism, the top pressing mechanism and the clamping assemblies are installed on the bottom frame. The bottom supporting mechanism is used for supporting the lower shell; the top pressing mechanism is used for pressing the upper cover, and the lower shell and the upper cover are clamped and fixed through the top pressing mechanism and the bottom supporting mechanism; the multiple clamping assemblies are distributed on the front side and the rear side of the lower shell and abut against the outer wall of the lower shell. The clamping assembly comprises a supporting frame and a clamping rod. The middle of the clamping rod is rotationally connected with the supporting frame, pressing rods are arranged at the two ends of the clamping rod, and the ends of the pressing rods abut against the outer wall of the lower shell.

Description

TECHNICAL FIELD

[0001] The utility model relates to workpiece clamping technical field especially relates to a welding fixing platform. BACKGROUND

[0002] The longitudinal beam is the main part of the automobile front subframe, as shown in Figs. Figure 1 and Figure 2 The longitudinal beam is mainly composed of a lower shell and an upper cover. In production, the bottom edge of the upper cover is embedded in the lower shell, and finally the connection between the upper cover and the lower shell is welded from the outside. In order to ensure the welding effect of the upper cover and the lower shell, a clamping tool is used to press the lower shell from the outer wall of the lower shell to make the lower shell and the bottom edge of the upper cover tightly fit. The existing clamping tool generally uses multiple strip-shaped clamping blocks to press the outer wall of the lower shell, that is, the surface contact form is used to press the outer wall of the lower shell. However, the outer wall of the lower shell is generally in an arc shape, and the strip-shaped clamping block will only allow a part of the clamping block to contact the outer wall of the lower shell, so that the outer wall of the lower shell cannot be uniformly stressed, thereby causing poor fit between the lower shell and the bottom edge of the upper cover, and cracks in the weld after welding, resulting in a poor yield of the front sub longitudinal beam after welding. SUMMARY

[0003] Therefore, the utility model provides a welding fixing platform for solving one of the problems in the prior art.

[0004] To achieve one or part or all of the above purposes or other purposes, the utility model provides:

[0005] A welding fixing platform for fixing the lower shell and the upper cover of the front sub longitudinal beam, the bottom edge of the upper cover being embedded in the lower shell, the welding fixing platform comprising a base frame, a bottom lifting mechanism mounted on the base frame, a top pressing mechanism, and a plurality of clamping assemblies;

[0006] The bottom lifting mechanism is used to support the lower shell;

[0007] The top pressing mechanism is used to press the upper cover, and the lower shell and the upper cover are clamped and fixed by the top pressing mechanism and the bottom lifting mechanism;

[0008] The plurality of clamping assemblies are distributed on the front and rear sides of the lower shell, and the plurality of clamping assemblies respectively abut against the outer wall of the lower shell; the clamping assembly comprises a support frame and a clamping rod,

[0009] The middle part of the clamping rod is rotatably connected to the support frame, and the two ends of the clamping rod are provided with pressing rods, and the end part of the pressing rod abuts against the outer wall of the lower shell.

[0010] Further, the end part of the pressing rod is provided with a wave bead, and the wave bead contacts the outer wall of the lower shell.

[0011] Further, the axes of the two pressing rods on the clamping rod are parallel to each other.

[0012] Further, the axes of the two pressing rods on the clamping rod intersect.

[0013] Further, the distance from the two pressing rods on the clamping rod to the bottom of the support frame is not equal; the distance from the ends of the two pressing rods to the support frame is not equal.

[0014] Further, it further comprises a plurality of translation mechanisms, the translation mechanism comprising a mounting plate and a first air cylinder;

[0015] The mounting plate is slidably mounted on the chassis; at least two clamping assemblies can be fixed on the mounting plate;

[0016] The first air cylinder is fixed on the chassis, and the output shaft of the first air cylinder is drivingly connected with the mounting plate. The mounting plate can be moved by the first air cylinder, so that the pressing rods of the clamping assemblies fixed on the mounting plate approach or move away from the side wall of the lower shell.

[0017] Further, it further comprises a single rod clamping piece, which is fixed on the mounting plate; the single rod clamping piece comprises a single rod support and a single head rod fixed on the single rod support, and the end of the single head rod is designed in a spherical shape.

[0018] Further, the bottom lifting mechanism comprises a center bracket, and the top pressing mechanism comprises a center pressing piece;

[0019] The center bracket is provided with two first trays for supporting the bottom of the lower shell; the first tray is provided with a support column which can pass through the lower shell and the upper cover;

[0020] The center pressing piece comprises a first base and a connecting fork arm, the first base is fixed on the chassis, one end of the connecting fork arm is rotatably connected with the first base, and the other end of the connecting fork arm is provided with two first pressing discs, the two first pressing discs are respectively used for abutting against the top of the two support columns, and the upward movement of the upper cover is limited by the first tray, the support column and the first pressing disc.

[0021] Further, the bottom lifting mechanism comprises two end brackets, and the top pressing mechanism comprises two end pressing pieces.

[0022] The two end brackets are respectively used for supporting the ends of the lower shell, and the end bracket comprises a second tray for supporting the bottom of the lower shell.

[0023] Two end portion pressing members are arranged in one-to-one correspondence with two end portion brackets; the end portion pressing member comprises a second base, a second pressing disc and a second cylinder; the second base is mounted on the base frame, the second pressing disc is slidably mounted on the second base, the second pressing disc abuts against the top of the upper cover, and a pressing column is arranged on the second pressing disc and can pass through the upper cover and the lower shell to abut against the second tray; the second cylinder is fixed on the second base and drives the second pressing disc to move up and down.

[0024] Further, an inner support mechanism is further included, the inner support mechanism comprises a third base, a third cylinder and an inner support member, the third base is slidably mounted on the base frame, the inner support member comprises a support frame and an inner support block arranged on the support frame, the inner support block can extend into the opening between the lower shell and the upper cover, and the inner support block abuts against the inner walls of the lower shell and the upper cover respectively, and the third cylinder is fixed on the base frame and drives the third base to move so that the inner support block approaches or moves away from the opening.

[0025] By implementing the embodiment of the utility model, the following beneficial effects can be achieved:

[0026] After the above scheme is adopted, the bottom lifting mechanism and the top pressing mechanism are used to preliminarily clamp and fix the lower shell and the upper cover, the outer wall of the lower shell is approached by the plurality of clamping assemblies distributed around, the two pressing rods arranged on the clamping rod abut against the outer wall of the lower shell to realize clamping, the middle part of the clamping rod is rotatably connected to the support frame, when the pressing rods abut against the arc-shaped outer wall of the lower shell, the single end of the clamping rod is tilted under the force, and then the other pressing rod can abut against the outer wall of the lower shell, so that all the pressing rods can abut against the outer wall of the lower shell to realize clamping, the problem of uneven force on the outer wall of the lower shell in the traditional clamping tool is solved, and then the bottom edges of the lower shell and the upper cover are tightly attached to each other before and after welding, so that the welding effect and the connection stability of the lower shell and the upper cover after welding are improved, and the yield rate of the platform during production is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 It is the overall structure schematic diagram of the object workpiece longitudinal beam of the embodiment.

[0029] Figure 2 Separation schematic view of the object workpiece longitudinal beam of the present embodiment;

[0030] Figure 3 Structure schematic view of the longitudinal beam clamped by the welding fixing platform of the present embodiment Figure 1 ;

[0031] Figure 4 Structure schematic view of the longitudinal beam clamped by the welding fixing platform of the present embodiment Figure 2 ;

[0032] Figure 5 Structure schematic view of the welding fixing platform of the present embodiment;

[0033] Figure 6 Top view of the welding fixing platform of the present embodiment;

[0034] Figure 7 Top view of the longitudinal beam clamped by the clamping assembly of the present embodiment;

[0035] Figure 8 Structure schematic view of the clamping assembly of the present embodiment;

[0036] Figure 9 Structure schematic view of the clamping assembly and the translation mechanism of the present embodiment Figure 1 ;

[0037] Figure 10 Structure schematic view of the clamping assembly and the translation mechanism of the present embodiment Figure 2 ;

[0038] Figure 11 Structure schematic view of the clamping assembly and the translation mechanism of the present embodiment Figure 3 ;

[0039] Figure 12 Structure schematic view of the clamping assembly and the translation mechanism of the present embodiment Figure 4 ;

[0040] Figure 13 Structure schematic view of the clamping assembly and the translation mechanism of the present embodiment Figure 5 ;

[0041] Figure 14 Structure schematic view of the center bracket and the center pressing piece of the present embodiment;

[0042] Figure 15 Structure schematic view of the end bracket and the end pressing piece of the present embodiment.

[0043] Reference signs:

[0044] A, lower shell; B, upper cover;

[0045] 1, base frame;

[0046] 2, bottom lifting mechanism; 20, center bracket; 200, first tray; 201, support column; 21, end bracket; 210, second tray;

[0047] 3, top pressing mechanism; 30, center pressing piece; 300, first base; 301, connecting fork arm; 302, first pressing disc; 31, end pressing piece; 310, second base; 311, second pressing disc; 312, second cylinder; 313, pressing column;

[0048] 4, clamping assembly; 40, support frame; 400, U-shaped groove; 41, clamping rod; 42, pressing rod; 420, wave bead;

[0049] 5, translation mechanism; 50, mounting plate; 51, first cylinder;

[0050] 6, single rod clamping piece; 60, single rod support; 61, single head rod;

[0051] 7, inner support mechanism; 70, third base; 71, third cylinder; 72, inner support piece; 720, inner support block. DETAILED DESCRIPTION

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the present application is well suited to carry out the objects and advantages thereof and will be understood by practitioners of the art. The following detailed description is presented primarily for the purpose of enabling others to make and use the application.

[0053] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily referring to the same embodiment nor are separate or alternative embodiments mutually exclusive of other embodiments. It is expressly understood that the described embodiments are merely example embodiments of the application and should not be understood as a limitation of the application. It is to be understood that the use of "any" herein does not exclude the use of "all", and the use of "all" does not exclude the use of "any".

[0054] In order to make the technical personnel in the technical field better understand the application scheme, the technical solutions in the embodiments of the application will be described clearly and completely below in conjunction with the drawings.

[0055] Reference is made to the accompanying drawings Figure 1 - the accompanying drawings Figure 15The embodiment discloses a welding fixing platform for fixing a lower shell A of a front sub-longitudinal beam and an upper cover B, the bottom edge of the upper cover B is embedded in the lower shell A, and the welding fixing platform comprises a base frame 1, a bottom lifting mechanism 2 mounted on the base frame 1, a top pressing mechanism 3 and a plurality of clamping assemblies 4; the bottom lifting mechanism 2 is used for supporting the lower shell A; the top pressing mechanism 3 is used for pressing the upper cover B, and the lower shell A and the upper cover B are clamped and fixed through the top pressing mechanism 3 and the bottom lifting mechanism 2; the plurality of clamping assemblies 4 are distributed on the front and rear sides of the lower shell A, and the plurality of clamping assemblies 4 abut against the outer wall of the lower shell A respectively; the clamping assembly 4 comprises a support frame 40 and a clamping rod 41, the middle part of the clamping rod 41 is rotationally connected with the support frame 40, and the two ends of the clamping rod 41 are provided with pressing rods 42, and the end parts of the pressing rods 42 abut against the outer wall of the lower shell A.

[0056] Specifically, the platform mainly realizes welding by clamping the lower shell A and the upper cover B of the longitudinal beam, as shown in Figure 1 and Figure 2 the bottom edge of the upper cover B is embedded in the lower shell A, and the outer side wall of the lower shell A is designed in an overall arc shape, and the embodiment supports and clamps based on the structure of the existing longitudinal beam; the lower shell A is placed on the bottom lifting mechanism 2, then the upper cover B is embedded on the lower shell A, and then the top pressing mechanism 3 is used for pressing to prevent the upper cover B from being raised upward or misaligned; in order to ensure the fitting effect of the lower shell A and the bottom edge of the upper cover B, a plurality of clamping assemblies 4 are distributed on the front and rear sides of the lower shell A, specifically, eight clamping assemblies 4 can be arranged, four clamping assemblies 4 are distributed on one side of the lower shell A, and four clamping assemblies 4 are also distributed on the other side, each clamping assembly 4 comprises a support frame 40 and a clamping rod 41, a U-shaped groove 400 is arranged on the support frame 40, the middle part of the clamping rod 41 is rotationally connected in the U-shaped groove 400 through a connecting rod, the clamping rod 41 is spaced apart from the bottom wall of the U-shaped groove 400, the two end pressing rods 42 can be fitted according to the arc shape of the outer wall of the lower shell A through the movable clamping rod 41, and the plurality of clamping assemblies 4 form multi-point clamping of the outer wall of one side of the lower shell A, so that the outer wall of the lower shell A is uniformly stressed, the condition that a large area of the outer wall of the lower shell A is not clamped by an external force is avoided, the inner wall of the lower shell A is closely fitted with the bottom edge of the upper cover B, and the connection stability after welding is improved; in addition, a cylinder or a motor can be arranged at the bottom of the support frame 40 to control the distance between the support frame 40 and the lower shell A, and the acting force of the pressing rod 42 on the outer wall of the lower shell A is controlled.

[0057] In summary, after the bottom lifting mechanism 2 and the top pressing mechanism 3 preliminarily clamp and fix the lower shell A and the upper cover B, the platform can control the multiple clamping assemblies 4 distributed around to be close to the outer wall of the lower shell A, and the two pressing rods 42 arranged on the clamping rod 41 abut against the outer wall of the lower shell A to realize clamping. Since the middle part of the clamping rod 41 is rotationally connected with the support frame 40, when the pressing rod 42 abuts against the arc-shaped outer wall of the lower shell A, the single end of the clamping rod 41 is tilted under the force, so that the other pressing rod 42 can abut against the outer wall of the lower shell A, to ensure that all the pressing rods 42 can abut against the outer wall of the lower shell A to realize clamping, solve the problem of uneven force of the traditional clamping tool on the outer wall of the lower shell A, and then make the bottom edges of the lower shell A and the upper cover B closely adhere to each other before and after welding, so as to improve the welding effect and the connection stability of the lower shell A and the upper cover B after welding, and improve the yield rate of the platform in production.

[0058] As shown in Figure 8 , in order to avoid damage to the outer wall of the lower shell A by the pressing rod 42, and to improve the point clamping effect of the pressing rod 42 on the outer shell, the end of the pressing rod 42 is provided with a wave bead 420, which contacts the outer wall of the lower shell A.

[0059] In this embodiment, for the part of the outer wall of the lower shell A with a relatively gentle arc-shaped transition, the clamping assembly 4 as shown in Figure 8 or the left clamping assembly 4 as shown in Figure 12 can be used, in which the axes of the two pressing rods 42 on the clamping rod 41 are parallel to each other, and specifically the clamping rod 41 can be arranged as a straight rod, and the pressing rods 42 are installed in a manner perpendicular to the clamping rod 41.

[0060] In this embodiment, for the part of the outer wall of the lower shell A with a relatively steep arc-shaped transition, the right clamping assembly 4 as shown in Figure 10 can be used, in which the axes of the two pressing rods 42 on the clamping rod 41 intersect, and specifically the clamping rod 41 can be arranged as a special-shaped rod bent in the horizontal direction, and the two pressing rods 42 are distributed and installed on different segments of the clamping rod 41.

[0061] In this embodiment, for the part of the outer wall of the lower shell A with a height difference, the right clamping assembly 4 as shown in Figure 12 can be used, in which the distances from the two pressing rods 42 on the clamping rod 41 to the bottom of the support frame 40 are not equal, and specifically the clamping rod 41 can be arranged as a special-shaped rod bent in the vertical direction, and the two pressing rods 42 are respectively installed on different segments of the clamping rod 41.

[0062] In addition to the above several cases, the left clamping assembly 4 as shown in Figure 10The middle clamping assembly 4 shown, the pressing rod 42 is installed in front and back of the clamping rod 41, so that the end of the two pressing rods 42 is not equal to the distance of the support frame 40, in order to cope with the lower shell A of the outer wall of the concave or convex part; According to the special situation, you can also install a pressing rod 42 on the clamping rod 41 near the center position, such as Figure 13 , to adapt to the arc-shaped outer wall of the lower shell A.

[0063] In actual operation, the above-mentioned various conditions can be combined, so that multiple clamping assemblies 4 can realize perfect and uniform clamping of the outer wall of the lower shell A.

[0064] In order to control the distance between the support frame 40 and the lower shell A, the welding fixing platform also includes a plurality of translation mechanisms 5, the translation mechanism 5 includes a mounting plate 50 and a first cylinder 51; The mounting plate 50 is slidably installed on the chassis 1; The mounting plate 50 can be fixed with at least two clamping assemblies 4; The first cylinder 51 is fixed on the chassis 1, the output shaft of the first cylinder 51 is drivingly connected with the mounting plate 50, the mounting plate 50 is driven to move by the first cylinder 51, so that the pressing rod 42 of the clamping assembly 4 fixed on the mounting plate 50 approaches or moves away from the side wall of the lower shell A. Specifically, a plurality of mounting holes can be provided on the mounting plate 50, and corresponding assembly holes can be provided on the bottom of the support frame 40 of the clamping assembly 4, and the support frame 40 can be fixed to the mounting plate 50 by bolts or the like. In actual operation, according to the needs, a plurality of mounting holes can be provided on the mounting plate 50 of a single translation mechanism 5, such as Figure 9 The single clamping assembly 4 shown, such as Figure 11 Two clamping assemblies 4 shown, such as Figure 10 Three clamping assemblies 4 shown, have high free assembly.

[0065] For the part that cannot be satisfied by the above-mentioned double-rod clamping, the welding fixing platform also includes a single-rod clamping piece 6, such as Figure 10 The leftmost structure shown, the single-rod clamping piece 6 is fixed on the mounting plate 50; The single-rod clamping piece 6 includes a single-rod bracket 60 and a single-head rod 61 fixed on the single-rod bracket 60, and the end of the single-head rod 61 is designed as a spherical shape. According to the actual clamping condition, the single-rod clamping piece 6 can be installed on any translation mechanism 5 to realize the close fit of the lower shell A and the bottom edge of the upper cover B.

[0066] As shown in Figure 1 And Figure 2 The middle part of the longitudinal beam has two center holes, the end part of the longitudinal beam has end holes, and the longitudinal beam needs to be connected with other parts of the front subframe, openings are provided at both ends of the longitudinal beam, and the side wall of the longitudinal beam also has openings. The bottom lifting mechanism 2 and the top pressing mechanism 3 will be based on the existing opening and opening of the longitudinal beam to realize support and pressing, as follows:

[0067] AsFigure 14 The bottom lifting mechanism 2 comprises a center bracket 20, and the top pressing mechanism 3 comprises a center pressing piece 30; the center bracket 20 is provided with two first trays 200 for supporting the bottom of the lower shell A; the first tray 200 is provided with a support column 201 which can pass through the lower shell A and the upper cover B; the center pressing piece 30 comprises a first base 300 fixed on the bottom frame 1 and a connecting fork arm 301 rotatably connected to the first base 300 at one end and provided with two first pressing discs 302 at the other end, the two first pressing discs 302 are respectively used for abutting against the top of the two support columns 201, and the upward movement of the upper cover B is limited by the first tray 200, the support column 201 and the first pressing disc 302. Since the inner diameter of the center hole of the lower shell A is larger, the inner diameter of the coaxial center hole of the upper cover B is smaller, and the upper cover B has a lower recess on the top wall of the center hole, the first tray 200 is used to support the bottom of the lower shell A, the support column 201 on the first tray 200 passes through the lower shell A and the upper cover B in turn and abuts against the first pressing disc 302, the upward movement of the upper cover B is prevented from being dislocated by the first tray 200 and the first pressing disc 302, and the first base 300 can be provided with a cylinder for driving the overturning of the connecting fork arm 301, so that the first pressing disc 302 can be stably pressed downward and kept.

[0068] As Figure 15The bottom lifting mechanism 2 comprises two end supports 21, and the top pressing mechanism 3 comprises two end pressing members 31; the two end supports 21 are respectively used for supporting the ends of the lower shell A, and each end support 21 comprises a second tray 210 used for supporting the bottom of the lower shell A; the two end pressing members 31 are arranged in one-to-one correspondence with the two end supports 21; the end pressing member 31 comprises a second base 310, a second pressing disc 311 and a second cylinder 312; the second base 310 is installed on the chassis 1, the second pressing disc 311 is slidably installed on the second base 310, the second pressing disc 311 abuts against the top of the upper cover B, and a pressing column 313 is arranged on the second pressing disc 311 and can pass through the upper cover B and the lower shell A and abut against the second tray 210; the second cylinder 312 is fixed on the second base 310 and drives the second pressing disc 311 to move up and down. Different from the limiting structure of the center hole, the hole diameters of the upper and lower holes of the longitudinal beam end are close, so that the second tray 210 with a large outer diameter is arranged to support the lower shell A, the second pressing disc 311 is controlled by the second cylinder 312 to limit the upper cover B, and the pressing column 313 is arranged on the second pressing disc 311 and abuts against the second tray 210 through the upper cover B and the lower shell A. Specifically, a limiting block that can be extended and retracted is arranged on the side wall of the pressing column 313 and used for abutting against the inner top wall of the upper cover B. The limiting block is arranged to prevent the upper cover B from being deformed due to the action force of the second pressing disc 311. In order to facilitate the assembly of the longitudinal beam, a sliding rail can be further arranged on the second base 310 and slidably connected with the chassis 1. The movement of the second base 310 is driven by the cylinder, so that the second base 310 can be close to or away from the longitudinal beam.

[0069] As Figure 4 and Figure 6 The welding fixing platform further comprises an inner supporting mechanism 7, the inner supporting mechanism 7 comprises a third base 70, a third cylinder 71 and an inner supporting member 72, the third base 70 is slidably installed on the chassis 1, the inner supporting member 72 comprises a support and an inner supporting block 720 arranged on the support, the inner supporting block 720 can be extended into the opening between the lower shell A and the upper cover B, and abuts against the inner walls of the lower shell A and the upper cover B respectively, and the third cylinder 71 is fixed on the chassis 1 and drives the third base 70 to move, so that the inner supporting block 720 is close to or away from the opening. In the embodiment, a plurality of inner supporting mechanisms 7 can be arranged according to the number of lateral openings of the longitudinal beam. Before the top pressing mechanism 3 is pressed, the inner supporting block 720 of each inner supporting mechanism 7 can be extended into the corresponding opening, so as to prevent the longitudinal beam from being deformed after the top pressing mechanism 3 is pressed. The inner supporting block 720 can be set to have a corresponding thickness according to the height of different openings.

[0070] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments, and the preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or equivalently replace some of the technical features. Any equivalent structure made by using the content of the present application specification and drawings, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A welding and fixing platform for fixing the lower shell and upper cover of a front auxiliary longitudinal beam, wherein the bottom edge of the upper cover is embedded in the lower shell, characterized in that, The welding fixing platform comprises a chassis, a bottom lifting mechanism mounted on the chassis, a top pressing mechanism and a plurality of clamping assemblies; The bottom lifting mechanism is used for supporting the lower shell; The top pressing mechanism is used for pressing the upper cover, and the lower shell and the upper cover are clamped and fixed through the top pressing mechanism and the bottom lifting mechanism; A plurality of clamping assemblies are distributed on the front and rear sides of the lower shell, and the plurality of clamping assemblies respectively abut against the outer wall of the lower shell; the clamping assembly comprises a support frame and a clamping rod, The middle part of the clamping rod is rotationally connected with the support frame, and the two ends of the clamping rod are provided with pressing rods, and the end part of the pressing rod abuts against the outer wall of the lower shell.

2. The welding fixture of claim 1, wherein, The end part of the pressing rod is provided with a wave bead, and the wave bead is in contact with the outer wall of the lower shell.

3. The welding fixture of claim 2, wherein, The axes of the two pressing rods on the clamping rod are parallel to each other.

4. The welding fixture of claim 2, wherein, The axes of the two pressing rods on the clamping rod intersect.

5. The welding fixture of claim 2, wherein, The distance between the two pressing rods on the clamping rod and the bottom of the support frame is not equal, and the distance between the end part of the two pressing rods and the support frame is not equal.

6. A welding fixture platform according to any one of claims 1-5, characterized in that, Further comprising a plurality of translation mechanisms, the translation mechanism comprises a mounting plate and a first air cylinder; The mounting plate is slidably mounted on the chassis; at least two clamping assemblies can be fixed on the mounting plate; The first air cylinder is fixed on the chassis, the output shaft of the first air cylinder is drivingly connected with the mounting plate, and the first air cylinder can drive the mounting plate to move, so that the pressing rods of the clamping assemblies fixed on the mounting plate approach or move away from the side wall of the lower shell.

7. The welding fixture of claim 6, wherein, Further comprising a single-rod clamping piece, the single-rod clamping piece is fixed on the mounting plate; the single-rod clamping piece comprises a single-rod support and a single-head rod fixed on the single-rod support, and the end part of the single-head rod is designed in a spherical shape.

8. The welding fixture of claim 6, wherein, The bottom lifting mechanism comprises a center bracket, and the top pressing mechanism comprises a center pressing piece; The center bracket is provided with two first trays, and the first trays are used for supporting the bottom of the lower shell; the first trays are provided with support columns which can pass through the lower shell and the upper cover; The center pressing piece comprises a first base and a connecting fork arm, the first base is fixed on the chassis, one end of the connecting fork arm is rotationally connected with the first base, and the other end of the connecting fork arm is provided with two first pressing discs, the two first pressing discs are respectively used for abutting against the top of the two support columns, and the first tray, the support column and the first pressing disc limit the upward movement of the upper cover.

9. The welding fixture of claim 6, wherein, The bottom lifting mechanism comprises two end brackets, and the top pressing mechanism comprises two end pressing pieces; The two end brackets are respectively used for supporting the ends of the lower shell, and the end bracket comprises a second tray, and the second tray is used for supporting the bottom of the lower shell; The two end pressing pieces are correspondingly arranged with the two end brackets; the end pressing piece comprises a second base, a second pressing disc and a second air cylinder; the second base is mounted on the chassis, the second pressing disc is slidably mounted on the second base, the second pressing disc abuts against the top of the upper cover, and the second pressing disc is provided with a pressing column which can pass through the upper cover and the lower shell and abut against the second tray; the second air cylinder is fixed on the second base and drives the second pressing disc to move up and down.

10. The welding fixture of claim 6, wherein, The inner support mechanism comprises a third base, a third cylinder and an inner support piece, the third base is slidably installed on the chassis, the inner support piece comprises a support and an inner support block arranged on the support, the inner support block can extend into the opening between the lower shell and the upper cover, and the inner support block abuts against the inner walls of the lower shell and the upper cover respectively, and the third cylinder is fixed on the chassis and drives the third base to move, so that the inner support block is close to or away from the opening.

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