CN218695499U - Welding machine tool for large part of vehicle body - Google Patents

Abstract

The utility model discloses a welding machine tool for large parts of a vehicle body, which belongs to the technical field of auxiliary welding tools for vehicle bodies of rail transit vehicles, and is provided with an end pressing support beam and a side pressing support beam for bearing workpieces; and a hold-down beam disposed between the end hold-down support beam and the side hold-down support beam; two ends of each side pressing support beam are movably connected with side pressing arms, and one end of each side pressing arm is connected with a first hydraulic cylinder for driving the side pressing arms to press a workpiece; the end pressing support beam is movably connected with end pressing arms at intervals along the length direction, and the end pressing arms and the side pressing arms tightly press the workpiece through pressing rods; compress tightly roof beam both ends swing joint and have U type pressure arm, two be connected with the walking beam between the U type pressure arm to compress tightly the annex and wait for the welding in the work piece top, the utility model discloses can adapt to the use in different motorcycle types, it is high to have the commonality, simple structure, and it is convenient to use, beneficial effect that degree of automation is high.

Description

Welding machine tool for large part of vehicle body

Technical Field

The utility model relates to a rail transit vehicle automobile body welding auxiliary fixtures technical field especially relates to an automobile body major possession welding machine frock.

Background

With the continuous development of the railway industry, new challenges and requirements are continuously provided for a rapid and convenient production process, and particularly the solution to the conventional bottleneck problem is urgent;

at present, due to the fact that the replacement frequency of products is high, and due to the fact that most of replaced welding tools are special tools in the initial design stage, basically, a plurality of vehicle types can be stacked like a mountain when being used, in actual use, due to the fact that the design structure is mostly in a manual mode, production efficiency is low, and time and labor are wasted when people and sea tactics often occur;

therefore, the problem just above is solved, the utility model provides a can adapt to the use in different motorcycle types, the commonality is high, and is simple, and a big part welder frock of automobile body that convenient, degree of automation is high is necessary.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defect that prior art exists, provide a welding machine frock of automobile body major component.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model discloses a welding machine frock of automobile body major component, it can be assembled on the ground of formula T type groove structure deeply buried with dismantling, and this frock includes:

the end pressing support beam and the side pressing support beam are used for supporting the workpiece; and

a hold-down beam disposed between the end hold-down support beam and the side hold-down support beam;

two ends of each side pressing support beam are movably connected with side pressing arms, and one end of each side pressing arm is connected with a first hydraulic cylinder for driving the side pressing arms to press a workpiece;

the end pressing support beam is movably connected with end pressing arms at intervals along the length direction, and the end pressing arms and the side pressing arms tightly press the workpiece through pressing rods;

the two ends of the pressing beam are movably connected with U-shaped pressing arms, and a movable beam is connected between the two U-shaped pressing arms so as to press the accessory above the workpiece to wait for welding.

Furthermore, the upper surface of the end pressing support beam is fixedly connected with end bases at intervals;

the top end of the end base is fixedly connected with a first support;

the lug plate fixedly connected to one side of the end base is rotatably connected with the end pressing arm in an L-shaped structure through a horizontal shaft, at least two positioning holes are circumferentially distributed on the lug plate by taking the horizontal shaft as a center, and the positioning holes penetrate through the end pressing arm through positioning shafts and fix the posture of the end pressing arm.

Furthermore, the horizontal section of the L-shaped structure of the end pressure arm is in threaded connection with the pressure lever, and the vertical section of the L-shaped structure of the end pressure arm is in threaded connection with the ejector rod.

Furthermore, the side pressing support beam also comprises side bases fixedly connected at the two ends of the side pressing support beam and a second support fixedly connected at the middle part of the side pressing support beam;

the top end of the side base is rotationally connected with the side pressure arm through a horizontal shaft, one end of the first hydraulic cylinder is rotationally connected with the side pressure arm, the other end of the first hydraulic cylinder is rotationally connected with the bottom end of the side base,

furthermore, one side base is movably connected with a shape-following positioning block which is used for contacting with the side wall of the workpiece on the side of the workpiece, and the other side base is in threaded connection with an ejector rod.

Furthermore, the side base comprises two vertical plates arranged at intervals and a side plate fixedly connected between the two vertical plates, wherein a first protruding part used for being in rotary connection with the side pressure arm is arranged on one side of each vertical plate, and a second protruding part is arranged on the other side of each vertical plate.

Furthermore, the two ends of the compression beam are fixedly connected with the side bases, and the open ends of the U-shaped compression arms are rotatably connected with the top ends of the side bases through horizontal shafts.

Further, the U type pressure arm is in including the base plate that is U type structure and distribution the connecting plate of base plate both sides, the diapire of base plate links firmly be used for the walking beam provides the second pneumatic cylinder that compresses tightly drive power, wherein, the base plate with reinforcement structure has been linked firmly between the connecting plate.

Furthermore, the side pressure arm is provided with a long hole along the length direction, the long hole is used for being movably connected with the pressure rod, and the pressure rod is positioned at two sides of the side pressure arm and is in threaded connection with positioning pieces.

Furthermore, the device also comprises a supporting beam which is arranged between the compression beam and the side compression supporting beam adjacent to the compression beam, and the supporting beam is fixedly connected with a plurality of third supports along the length direction.

In the technical scheme, the utility model provides a big part welding machine frock of automobile body, beneficial effect:

car body large part welding machine tool can meet the welding requirements of large parts of various car types, is good in universality, greatly saves pre-assembly time, the traditional large part welding pre-assembly time is 4-6 hours, 1.5 hours can be saved through the car body large part welding machine tool, 3 operators are saved, the consistency of products is effectively guaranteed, and the car body large part welding machine tool has the beneficial effects of simplicity, convenience and high automation degree

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

FIG. 1 is a partial isometric view of a vehicle body large part welder fixture disclosed by the present invention;

fig. 2 is an overall front view of the welding tool for the large components of the vehicle body disclosed by the utility model;

FIG. 3 isbase:Sub>A cross-sectional view A-A of the welding tool for the large parts of the vehicle body disclosed by the utility model;

FIG. 4 is an isometric view of a welding machine tool end clamping support beam for a large part of a vehicle body disclosed by the present invention;

fig. 5 is a perspective view of a welding machine tool end pressing support beam for a large vehicle body part disclosed by the present invention;

FIG. 6 is an axonometric view of a welding machine tool side pressing support beam for a large part of a vehicle body disclosed by the utility model;

FIG. 7 is an isometric view of the side base of the welding machine tool for the large parts of the vehicle body disclosed by the utility model;

FIG. 8 is an isometric view of another embodiment of a side base of a welding machine tool for large parts of a vehicle body disclosed by the present invention;

FIG. 9 is an isometric view of a welding machine tool hold-down beam for a large part of a vehicle body disclosed by the present invention;

fig. 10 is an axonometric view of a U-shaped press arm of a welding machine tool for large parts of a vehicle body disclosed by the utility model;

figure 11 is the utility model discloses an axonometric view of big part welder frock supporting beam of automobile body.

Description of the reference numerals:

end-pressing support beams 10; an end base 11; an ear plate 111; a first positioning hole 112; a second positioning hole 113; an end pressing arm 12; a first support 13;

side-pressing the support beam 20; a side base 21; a bottom plate 211; a riser 212; side plates 213; a first boss 214; the third positioning hole 2141; the second boss 215; fourth positioning hole 2151; a fifth positioning hole 216; a sixth positioning hole 217; a side pressing arm 22; elongated holes 221; a first hydraulic cylinder 23; a conformal positioning block 24; a second support 25;

a hold-down beam 30; a U-shaped pressing arm 31; a substrate 311; a connecting plate 312; a dovetail groove 313; a first reinforcing plate 314; a second reinforcing plate 315; a movable beam 32; a second hydraulic cylinder 33;

a support beam 40; a third support 41;

a pressure lever 50;

a top rod 60;

a foundation 70;

a workpiece 100.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.

FIG. 1 is a partial isometric view of a vehicle body large part welder fixture;

the utility model relates to a workpiece 100 and an accessory, wherein the workpiece 100 is a large part of a vehicle body underframe of different vehicle types in the prior art, the accessory is a traction beam of the underframe, and after the welding of the large part of the underframe is finished, the traction beam needs to be assembled and welded at the end part of the large part of the vehicle body;

the utility model relates to a foundation 70 which is a foundation with a deep buried T-shaped groove structure arranged in a factory building in the prior art, wherein the foundation 70 is put into production and use after being connected with tooling equipment through the T-shaped groove;

FIG. 2 is an overall front view of a welding machine tool for a large part of a vehicle body;

this automobile body major-part welding machine frock, it can be assembled on the ground 70 of formula T type groove structure deeply with dismantling, and this frock includes: the end pressing support beam 10, the side pressing support beam 20, and the pressing beam 30;

the end pressing backbars 10 and the side pressing backbars 20 are used for supporting the workpiece 100;

the compaction beam 30 is disposed between the end compaction support beam 10 and the side compaction support beam 20;

the two ends of the side pressing support beam 20 are movably connected with side pressing arms 22, one end of each side pressing arm 22 is connected with a first hydraulic cylinder 23 which drives the side pressing support beam to press the workpiece 100, the end pressing support beam 10 is movably connected with end pressing arms 12 at intervals along the length direction, and the end pressing arms 12 and the side pressing arms 22 press the workpiece 100 through pressing rods 50;

u-shaped pressing arms 31 are movably connected to two ends of the pressing beam 30, and a movable beam 32 is connected between the two U-shaped pressing arms 31 so as to press the accessory above the workpiece 100 to wait for welding.

Specifically, as shown in fig. 2 and 3, the number of the end pressing support beams 10 is two, the side pressing support beams 20 is multiple according to actual use requirements, and the end pressing support beams 10 and the side pressing support beams 20 are arranged between the two end pressing support beams 10 at intervals, the end pressing support beams 10 and the side pressing support beams 20 support the workpiece 100 in a symmetrical manner along the length direction of the workpiece 100, the pressing beams 30 are arranged at positions corresponding to accessories at the end parts of the workpiece 100 and are positioned between the end pressing support beams 10 and the side pressing support beams 20, mounting holes are formed in the lower parts of the end pressing support beams 10, the side pressing support beams 20 and the pressing beams 30, the mounting holes are fixedly connected with T-shaped grooves of the foundation 70 through bolt assemblies, and the tool is adapted to large vehicle body components of different vehicle types in the length direction by adjusting the distance between the end pressing support beams 10 and the side pressing support beams 20;

two ends of the side pressing support beam 20 are rotatably connected with side pressing arms 22 through horizontal shafts, one end of each side pressing arm 22 is connected with a first hydraulic cylinder 23 for driving the side pressing arm to press the workpiece 100, the first hydraulic cylinders 23 are connected with an external control system, and the control system drives the first hydraulic cylinders 23 to start, so that the plurality of side pressing arms 22 are automatically driven to synchronously and automatically press the workpiece 100, the automation degree of the tool is improved, and the investment of operators is reduced;

the end pressing support beam 10 is rotationally connected with end pressure arms 12 at intervals along the length direction through a horizontal shaft, the end pressure arms 12 and the side pressure arms 22 surround to form a ring shape, the position of the workpiece 100 is fixed from the upper part of the workpiece 100 in a pressure point mode, wherein the end pressure arms 12 and the side pressure arms 22 are in contact with the workpiece 100 through pressure rods 50, the pressure rods 50 can be in threaded connection with the end pressure arms 12 and the side pressure arms 22, and when the end pressing support beam is used, the height between the end parts of the pressure rods 50 and the surface of a foundation 70 is adjusted, so that the workpiece 100 is pressed;

the two ends of the pressing beam 30 are rotatably connected with U-shaped pressing arms 31 through horizontal shafts, a movable beam 32 is connected between the two U-shaped pressing arms 31, the U-shaped pressing arms 31 provide pressing force for the movable beam 32, the movable beam 32 presses the accessory above the workpiece 100 in the Z-axis direction to wait for welding, and a hanging plate is fixedly connected to the surface of the movable beam 32 and used for being connected with external hoisting equipment, so that the movable beam 32 is convenient to transfer, and the use is convenient.

FIG. 4 is an isometric view of the end clamp support beam 10, and FIG. 5 is a front view of the end clamp support beam 10;

preferably, the upper surface of the end pressing support beam 10 is fixedly connected with end bases 11 at intervals;

the top end of the end base 11 is fixedly connected with a first support 13;

the otic placode 111 that 11 one sides of end base linked firmly has the end pressure arm 12 that is L type structure through horizontal axis swivelling joint, and otic placode 111 uses the horizontal axis to have laid two at least locating holes as center circumference, and the locating hole runs through end pressure arm 12 through the locating shaft to the 12 gestures of fixed end pressure arm.

Specifically, as shown in fig. 5, the end pressing support beam 10 includes an end base 11, a first support 13 is fixedly connected to a top end of the end base 11, an end portion of the workpiece 100 is supported by the first support 13, an ear plate 111 is fixedly connected to a side of the end base 11 away from the workpiece 100, a bottom end of the ear plate 111 is rotatably connected to an end pressing arm 12 through a horizontal shaft, the ear plate 111 is further provided with two positioning holes, a first positioning hole 112 and a second positioning hole 113, the first positioning hole 112 is located above the horizontal shaft, and the second positioning hole 113 is located on one side of the first positioning hole 112;

when the horizontal shaft and the positioning shaft are matched with the first positioning hole 112, the end pressing arm 12 can be locked on the end base 11 in an inverted L-shaped structure and is in a posture of pressing the workpiece 100, when the horizontal shaft and the positioning shaft are matched with the second positioning hole 113, the end pressing arm 12 can be locked on the end base 11 in an inclined manner, the end pressing arm 12 is far away from the workpiece 100 at the moment, the workpiece 100 is conveniently placed above the first support 13, and the interference between the workpiece 100 and the end pressing arm 12 when the workpiece 100 is in place is avoided;

as shown in fig. 5;

preferably, the horizontal section of the L-shaped structure of the end pressing arm 12 is in threaded connection with the pressing rod 50, and the vertical section of the L-shaped structure of the end pressing arm 12 is in threaded connection with the ejector rod 60. In the structure, the workpiece 100 is pressed along the Z-axis direction through the pressure lever 50, and the workpiece 100 is tightly pressed along the Y-axis direction through the ejector rod 60, so that the workpiece 100 is prevented from moving along the Y-axis on the horizontal plane;

FIG. 6 is an isometric view of a side compression support beam;

preferably, the side compression support beam 20 further includes side bases 21 attached to both ends thereof, and a second base 25 attached to a middle portion thereof;

the top end of the side base 21 is rotatably connected with a side pressure arm 22 through a horizontal shaft, one end of a first hydraulic cylinder 23 is rotatably connected with the side pressure arm 22, and the other end of the first hydraulic cylinder is rotatably connected with the bottom end of the side base 21;

preferably, a follower positioning block 24 is movably connected to the two side bases 21, one side base 21 is located on the side of the workpiece 100 and is used for contacting with the side wall of the workpiece 100, and a top rod 60 is threadedly connected to the other side base 21 located on the side of the workpiece 100.

Specifically, two ends of a side pressing support beam 20 are fixedly connected with side bases 21, the middle of the side pressing support beam 20 is fixedly connected with two second supports 25, a workpiece 100 is supported by the second supports 25, the top end of the side base 21 is rotatably connected with a side pressing arm 22 through a horizontal shaft, a first hydraulic cylinder 23 is installed on the side, away from the workpiece 100, of the side base 21, a piston rod of the first hydraulic cylinder 23 is rotatably connected with the side pressing arm 22, and the bottom end of the first hydraulic cylinder 23 is rotatably connected with the side bases 21, wherein the two side bases 21 are located on the workpiece 100 side, one side base 21 is movably connected with a conformal positioning block 24, the other side base 21 is in threaded connection with a mandril 60, the two side bases 21 are matched with the width of the workpiece 100 through the conformal positioning block 24 and the mandril 60, and follow the inclination angle of the side wall of the workpiece 100 through the conformal positioning block 24 to support the workpiece 100;

FIG. 7 is an isometric view of the side base;

preferably, the side base 21 includes two spaced vertical plates 212 and a side plate 213 fixedly connected between the two vertical plates 212, a first protrusion 214 is disposed on one side of the vertical plate 212 for rotatably connecting with the side press arm 22, and a second protrusion 215 is disposed on the other side of the vertical plate 212.

Specifically, the side base 21 includes a bottom plate 211, two vertical plates 212 fixedly connected to the bottom plate 211, and a side plate 213 connected between the two vertical plates 212, the bottom plate 211 is fixedly connected to the side pressing support beam 20, a first protrusion 214 is formed on the side of the two vertical plates 212 far away from the workpiece 100, a third positioning hole 2141 formed in the first protrusion 214 is rotatably connected to the side pressing arm 22 through a horizontal shaft, a second protrusion 215 is formed on the side of the two vertical plates 212 located on the workpiece 100, and a fourth positioning hole 2151 formed in the second protrusion 215 is rotatably connected to the conformal positioning block 24 through a horizontal shaft; referring to fig. 8, in another preferred embodiment of the side base 21, the second protrusion 215 is threadedly connected with the stem rod 60;

fig. 9 is an isometric view of hold-down beam 30;

preferably, the two ends of the pressing beam 30 are fixedly connected with the side base 21, and the open end of the u-shaped pressing arm 31 is rotatably connected with the top end of the side base 21 through a horizontal shaft.

Specifically, the side bases 21 are arranged at two ends of the compression beam 30 and the side compression support beam 20, so that the compression beam 30 and the side compression support beam 20 share the side bases 21 with the same structure, the number of special parts of the tool is reduced, and the universality of parts of the tool is effectively ensured;

the opening end of the U-shaped pressure arm 31 is rotatably connected with a fifth positioning hole 216 formed in the top end of the side base 21 through a horizontal shaft, so that the U-shaped pressure arm 31 rotates to a position above the movable beam 32, the bottom wall of the inner part of the U-shaped pressure arm 31 is fixedly connected with a second hydraulic cylinder 33, the movable beam 32 is provided with a pressing driving force through the second hydraulic cylinder 33, in order to ensure that the U-shaped pressure arm 31 can stably press the movable beam 32, a sixth positioning hole 217 is formed in the position, above the fifth positioning hole 216, of the side base 21, and the positioning pin penetrates through the U-shaped pressure arm 31 and the sixth positioning hole 217 and can vertically and fixedly connect the U-shaped pressure arm 31 to the top end of the side base 21;

when the U-shaped pressing arm 31 is in a vertical state, the U-shaped pressing arm is in a working state, the second hydraulic cylinder 33 is in a vertical state, a piston rod of the second hydraulic cylinder 33 extends out and is in contact with the movable beam 32 to provide a pressing driving force for the movable beam 32, when the U-shaped pressing arm 31 is offset from one side of the side base 21, the U-shaped pressing arm 31 is in a non-working state, the U-shaped pressing arm 31 is matched with the third positioning hole 2141, and the U-shaped pressing arm 31 can be locked in posture by penetrating through the U-shaped pressing arm 31 and the third positioning hole 2141 through the positioning pin, so that the U-shaped pressing arm 31 is kept offset from one side of the side base 21;

fig. 10 is an isometric view of the U-shaped press arm 31;

preferably, the U-shaped pressing arm 31 includes a base plate 311 in a U-shaped structure and connecting plates 312 distributed on two sides of the base plate 311, the bottom wall of the base plate 311 is fixedly connected with a second hydraulic cylinder 33 for providing a pressing driving force for the movable beam 32, wherein a reinforcing structure is fixedly connected between the base plate 311 and the connecting plates 312.

Specifically, the U-shaped pressure arm 31 includes a base plate 311 and two connecting plates 312, the base plate 311 is bent into a U-shaped structure through a bending process, the U-shaped pressure arm 31 bears the second hydraulic cylinder 33 through the base plate 311, the top end of the base plate 311 is fixedly connected with the connecting plates 312 through a welding process, and in order to improve the overall structural strength of the U-shaped pressure arm 31, the base plate 311 is provided with a reinforcing structure;

the reinforcing structure comprises a dovetail groove 313 (the opening width of which is smaller than that of the bottom wall) formed at the top end of a base plate 311 and a dovetail boss formed at the end part of a connecting plate 312, the shape of the dovetail boss is matched with the shape of the dovetail groove 313, the length of a welding line is increased by matching the dovetail groove 313 and the dovetail boss, so that the connection reliability between the base plate 311 and the connecting plate 312 is improved, the reinforcing structure also comprises a first reinforcing plate 314 and a second reinforcing plate 315, the bottom wall of the base plate 311 is fixedly connected with the first reinforcing plate 314, the second reinforcing plate 315 is connected between the side wall of the base plate 311 and the side wall of the connecting plate 312, the local wall thickness of the U-shaped pressure arm 31 is increased by the first reinforcing plate 314 and the second reinforcing plate 315, the integral strength of the U-shaped pressure arm 31 is further improved, and the service life of the U-shaped pressure arm 31 is prolonged;

referring to fig. 7, preferably, the lateral pressure arm 22 is provided with a long hole 221 along the length direction for movably connecting with the pressure lever 50, and the two sides of the pressure lever 50 on the lateral pressure arm 22 are both screwed with positioning members.

Specifically, in this structure, after the position of the side pressure arm 22 is fixed on the side pressure support beam 20, the position of the pressure lever 50 is adjusted by the side pressure arm 22 along the width direction of the workpiece 100 through the elongated hole 221, so as to change the pressure point position where the side pressure arm 22 presses the workpiece 100, the two sides of the pressure lever 50 located on the side pressure arm 22 are both connected with a positioning member by screw threads, the positioning member is a nut in the prior art, and the pressure lever 50 is fixedly connected to the side pressure arm 22 at any position through the nut;

FIG. 11 is an isometric view of the support beam 40;

preferably, the tool further comprises a support beam 40 disposed between the pressing beam 30 and the side pressing support beam 20 adjacent to the pressing beam 30, and the support beam 40 is fixedly connected with a plurality of third supports 41 along the length direction.

Specifically, referring to fig. 1 and 2, by disposing the support beam 40 between the pressing beam 30 and the side pressing support beam 20 adjacent to the pressing beam 30 and cooperating with the pressing beam 30 to provide an opposite force to the pressing beam 30, the deformation of the workpiece 100 can be effectively prevented, and the welding quality can be improved, wherein the support beam 40 is provided with the third support 41 at intervals along the length direction, and contacts with the workpiece 100 through the third support 41 and supports the workpiece 100 during use;

in the technical scheme, the utility model provides a welding machine tool for large parts of a vehicle body;

the using method comprises the following steps: when the workpieces 100 are assembled, the end pressure arm 12 is offset from one side of the end pressure support beam 10, the piston rod of the first hydraulic cylinder 23 contracts, the side pressure arm 22 is in a vertical state, parts of the workpieces 100 are transferred to the upper part of the tool through external hoisting equipment and fall on the first support 13, the second support 25 and the third support 41, after the workpieces 100 are assembled, the external control system drives the piston rod of the first hydraulic cylinder 23 to extend out, so that the side pressure arm 22 presses the workpieces 100 from the side part, the end pressure arm 12 is turned over, and the end pressure arm 12 sequentially presses the end part of the workpieces 100;

when the accessory (draw beam) of the workpiece 100 is assembled, the accessory is placed at a corresponding position of the workpiece 100, the movable beam 32 is transferred to the position above the accessory through a hoisting device, the U-shaped pressure arm 31 of the compaction beam 30 is turned over, the U-shaped pressure arm 31 is in a vertical state, and the external control system drives the piston rod of the second hydraulic cylinder 33 to extend out and tightly push the movable beam 30, so that the movable beam 30 compacts the accessory;

while certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims (10)

1. Automobile body major-part welding machine frock, it can be assembled on ground (70) of formula T type groove structure deeply buried with dismantling, its characterized in that, this frock includes: an end pressing backbar (10) and a side pressing backbar (20) for supporting the workpiece (100); and

a hold-down beam (30) disposed between the end hold-down support beam (10) and the side hold-down support beam (20);

two ends of the side pressing support beam (20) are movably connected with side pressing arms (22), and one end of each side pressing arm (22) is connected with a first hydraulic cylinder (23) for driving the side pressing arm to press a workpiece (100);

the end pressing support beam (10) is movably connected with end pressing arms (12) at intervals along the length direction, and the end pressing arms (12) and the side pressing arms (22) tightly press a workpiece (100) through pressing rods (50);

the two ends of the pressing beam (30) are movably connected with U-shaped pressing arms (31), and a movable beam (32) is connected between the two U-shaped pressing arms (31) so as to press the accessory above the workpiece (100) to wait for welding.

2. The welding machine tool for the large parts of the vehicle body according to claim 1, wherein the welding machine tool comprises a welding machine tool body;

the upper surface of the end pressing support beam (10) is fixedly connected with end bases (11) at intervals;

the top end of the end base (11) is fixedly connected with a first support (13);

ear plate (111) that end base (11) one side linked firmly has through horizontal axis swivelling joint to be L type structure end pressure arm (12), just ear plate (111) use the horizontal axis has laid two at least locating holes as central circumference, the locating hole runs through the location axle end pressure arm (12) and fixed end pressure arm (12) gesture.

3. The welding machine tool for the large parts of the vehicle body according to claim 2, wherein the welding machine tool comprises a welding head and a welding head;

the horizontal section of the L-shaped structure of the end pressure arm (12) is in threaded connection with the pressure lever (50), and the vertical section of the L-shaped structure of the end pressure arm (12) is in threaded connection with the ejector rod (60).

4. The welding machine tool for the large parts of the vehicle body according to claim 1, wherein the welding machine tool comprises a welding machine tool body;

the side pressing support beam (20) also comprises side bases (21) fixedly connected at two ends of the side pressing support beam and a second support (25) fixedly connected at the middle part of the side pressing support beam;

the top end of the side base (21) is connected with the side pressure arm (22) through a horizontal shaft in a rotating mode, one end of the first hydraulic cylinder (23) is connected with the side pressure arm (22) in a rotating mode, and the other end of the first hydraulic cylinder is connected with the bottom end of the side base (21) in a rotating mode.

5. The welding machine tool for the large parts of the vehicle body according to claim 4, wherein the welding machine tool comprises a welding machine tool body;

the side base (21) is movably connected with a shape following positioning block (24) which is used for being in contact with the side wall of the workpiece (100) and is positioned on the workpiece (100), and the other side base (21) is in threaded connection with a push rod (60).

6. The welding machine tool for the large components of the vehicle body according to claim 5, characterized in that;

the side base (21) comprises two vertical plates (212) arranged at intervals and a side plate (213) fixedly connected between the two vertical plates (212), wherein a first protruding part (214) used for being rotationally connected with the side pressure arm (22) is distributed on one side of each vertical plate (212), and a second protruding part (215) is distributed on the other side of each vertical plate (212).

7. The welding machine tool for the large parts of the vehicle body according to claim 4, wherein the welding machine tool comprises a welding machine tool body;

compress tightly roof beam (30) both ends and all have linked firmly side base (21), the open end of U type pressure arm (31) through the horizontal axis with side base (21) top swivelling joint.

8. The welding machine tool for the large parts of the vehicle body according to claim 1, wherein the welding machine tool comprises a welding machine tool body;

u type pressure arm (31) are in including base plate (311) that are U type structure and distribution base plate (311) both sides connecting plate (312), the diapire of base plate (311) has linked firmly be used for walking beam (32) provide second hydraulic cylinder (33) that compress tightly drive power, wherein, base plate (311) with reinforcement structure has been linked firmly between connecting plate (312).

9. The welding machine tool for the large parts of the vehicle body according to claim 1, wherein the welding machine tool comprises a welding machine tool body;

the side pressure arm (22) is provided with a strip hole (221) which is movably connected with the pressure lever (50) along the length direction, and the pressure lever (50) is positioned on two sides of the side pressure arm (22) and is in threaded connection with a positioning piece.

10. The welding machine tool for the large parts of the vehicle body according to any one of claims 1 to 9, wherein the welding machine tool comprises a welding machine tool body;

the pressing device is characterized by further comprising a supporting beam (40) which is arranged between the pressing beam (30) and the side pressing supporting beam (20) adjacent to the pressing beam (30), and the supporting beam (40) is fixedly connected with a plurality of third supports (41) along the length direction.

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