A welding positioning mechanism and method for automobile chassis

Abstract

The present invention discloses a welding positioning mechanism and method for a vehicle chassis, and relates to the technical field of guardrails, including a support mechanism, a clamping mechanism fixedly connected between the telescopic ends of the support mechanism, and a welding mechanism fixedly connected to one side of the outer wall of the support mechanism. In the present invention, by clamping the vehicle chassis inside the clamping mechanism under the action of the support mechanism, the clamping mechanism and the welding mechanism, and under the interaction of various components inside the device, the height, direction and position of the vehicle chassis can be effectively adjusted, and in subsequent welding, the orientation of the vehicle chassis can be adjusted to meet welding requirements, thereby improving welding efficiency, reducing welding blind spots, and improving the quality of the final product.

Description

Technical Field

[0001] The invention relates to the technical field of protective railings, in particular to a welding positioning mechanism and method for an automobile chassis. Background Art

[0002] The welding positioning mechanism of the automobile chassis is a key component to ensure the accuracy and stability of the chassis welding process. These mechanisms usually include multiple components, each of which has a specific function to ensure the smooth progress of the welding operation. In practical applications, the welding positioning mechanism also needs to consider the convenience and safety of operation. For example, some mechanisms use sliding or lifting mechanisms so that the tooling fixtures can be easily switched to different positions or heights to meet different welding requirements. At the same time, these mechanisms also need to be equipped with necessary safety devices, such as limit blocks and hydraulic shock absorbers, to ensure safety and stability during operation. In short, the welding positioning mechanism of the automobile chassis is a complex and sophisticated system. It achieves precise positioning and fixation of the workpiece through the coordinated work of multiple components, thereby ensuring the smooth progress and high-quality completion of the welding process.

[0003] In the prior art, such as Chinese patent number: CN219598505U, a positioning mechanism for a welding fixture of automobile chassis parts is provided, including a workbench, a chassis body is arranged on the top outer wall of the workbench, a parts body is arranged on the top of the chassis body, a slide rail is connected to the top outer wall of the workbench by bolts, a slide seat is slidably connected to the outside of the slide rail, a fixture is fixed on the top of the slide seat, a connecting groove is arranged on the outer wall of one side of the slide rail, a pull rod is movably inserted inside the slide seat, a cam is hinged to one end of the pull rod through an axis, a baffle is welded to the inside of the connecting groove at one end of the pull rod, and a force plate 2 is integrally formed on the top outer wall of the cam. The utility model realizes the position movement of the fixture by sliding the slide seat on the slide rail, and when the cam rotates, the pull rod drives the baffle to squeeze the inner wall of the connecting groove to realize the fixing of the fixture, so that the fixture can meet the effect of pressing the chassis of various models, and after the fixture moves, it can be quickly locked and positioned.

[0004] Although the above-mentioned equipment can quickly lock the components, the above-mentioned equipment and the existing devices in the society only fix the automobile chassis and rely on external welding devices to weld it. In addition, during this welding process, the position and angle of the automobile chassis in the locked state are not adjusted, but only the welding device is adjusted (position, direction and angle). As a result, when welding the equipment, its small parts are not welded in place, welding blind spots are likely to occur, and the automobile chassis is not welded in place, which may easily affect the final quality problems. Summary of the invention

[0005] The purpose of the present invention is to provide a welding positioning mechanism for an automobile chassis. By clamping the components of the automobile chassis, the position, direction and angle of the clamping and welding equipment can be adjusted to improve the welding efficiency and reduce the welding blind spots, thereby effectively solving the problems raised in the above background.

[0006] To achieve the above object, the present invention provides the following technical solution: a welding positioning mechanism for an automobile chassis, comprising a supporting mechanism, a clamping mechanism fixedly connected between telescopic ends of the supporting mechanism, and a welding mechanism fixedly connected to one side of an outer wall of the supporting mechanism;

[0007] The clamping mechanism includes an adsorption plate, a mounting groove is provided at the top center of the adsorption plate, an inner circulation channel is provided inside the adsorption plate, a clamping groove is provided on the top of the adsorption plate, a filter plate is movably embedded in the inner surface wall of the clamping groove, a rotating motor 2 is fixedly inserted into the inner surface wall of the mounting groove, an inner adjustment plate is fixedly connected to the telescopic end of the rotating motor 2, two side fixing frames are movably sleeved on the outer surface wall of the inner adjustment plate, a two-way cylinder 2 is fixedly connected to the top of the inner adjustment plate, both telescopic ends of the two-way cylinder 2 are fixedly connected to a linkage plate and the bottoms of the two linkage plates are fixedly connected to the tops of the side fixing frames.

[0008] Preferably, a group of embedding grooves are opened on the top of the two side fixing frames, a group of cylinder three is fixedly connected to the top of the two side fixing frames, and the telescopic ends of the two groups of cylinder three are fixedly connected to the clamping plates.

[0009] Preferably, the inner walls of the two groups of clamping plates are fixedly connected with anti-slip pads, the bottoms of the two groups of clamping plates are fixedly connected with embedded blocks, and the outer walls of the two groups of embedded blocks are slidably embedded in the embedded grooves.

[0010] Preferably, the support mechanism comprises a support plate, the top of the support plate is fixedly connected to two adjustment frames, a fixing groove is provided at the bottom center of the inner wall of the two adjustment frames, and a group of sliding grooves are preset inside the two adjustment frames.

[0011] Preferably, an electric telescopic rod is fixedly inserted into the inner surface walls of the two fixing grooves, and the telescopic ends of the two electric telescopic rods are fixedly connected to a driving box.

[0012] Preferably, an inner notch is opened on one side of the outer wall of the two drive boxes, and a rotating motor is fixedly inserted into the inner surface wall of the two inner notches.

[0013] Preferably, the outer walls of the two rotating motors are fixedly connected with a group of side slides, and the outer walls of the two groups of side slides are slidably embedded in the sliding groove.

[0014] Preferably, the welding mechanism includes a side connecting plate, a telescopic component is fixedly connected to the top center of the side connecting plate, a mechanical arm is fixedly connected to the bottom of the inner wall of the telescopic component, and a welding head is fixedly connected to the operating end of the mechanical arm.

[0015] Preferably, one side of the outer wall of the support plate is fixedly connected to one side of the outer wall of the side connecting plate, and the telescopic ends of the two rotating motors are fixedly connected to the outer wall of the adsorption plate.

[0016] A method for welding a positioning mechanism of an automobile chassis comprises the following steps:

[0017] Step 1: First, fix the automobile chassis before welding it. Driven by an external mobile device, the automobile chassis can be placed on top of the two side fixing frames, and according to the size of the automobile chassis, the distance between the four clamping plates needs to be adjusted. At this time, the two-way cylinder 2 can use the linkage plate as a medium under the bidirectional action, and drive the two side fixing frames to move toward each other, so as to keep the two side fixing frames close and away from each other. When the two side fixing frames move to a position relationship suitable for the width of the automobile chassis, they stop. Then, the four cylinders 3 push the two groups of clamping plates to move toward each other, so as to keep the anti-skid pads fixed on one side of the inner wall of the four clamping plates in contact with the outer wall of the automobile chassis, and complete the clamping and fixing of the automobile chassis;

[0018] Step 2: With the push of the two electric telescopic rods, and the cooperation of the two sets of side slide plates respectively embedded and moved inside the sliding groove, the two drive boxes and the rotating motors fixed inside them can be effectively pushed to perform a height adjustment process, so as to keep the adsorption plate and the components fixed thereto at an optimal height for welding;

[0019] Step 3: Under the drive of the two rotating motors 1, the clamping mechanism can be kept rotating, and the rotating motor 2 can drive the top inner adjustment plate and the components fixed thereto to rotate. Through these two lateral and longitudinal rotations, the position adjustment of the automobile chassis can be maintained;

[0020] Step 4: When the position of the automobile chassis is adjusted, the welding mechanism can maintain the contact between the welding head fixed on the top and the automobile chassis under the rotation of its own mechanical arm, thereby completing the welding process of the automobile chassis.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] In the present invention, by clamping the automobile chassis inside the clamping mechanism under the action of the supporting mechanism, the clamping mechanism and the welding mechanism, and by the interaction of the various components inside the device, the height, direction and position of the automobile chassis can be effectively adjusted. During subsequent welding, the orientation of the automobile chassis can be adjusted to meet welding requirements, thereby improving welding efficiency, reducing welding blind spots and improving the quality of the final product.

[0023] In the present invention, under the action of the supporting mechanism, the clamping mechanism and the welding mechanism, when the device is in use, the clamping width and length can be appropriately adjusted according to the sizes of different automobile chassis, thereby improving the adaptability of the product to automobile chassis of various sizes.

[0024] In the present invention, under the action of the supporting mechanism, the clamping mechanism and the welding mechanism, when welding is carried out, the harmful gases generated can be adsorbed into the interior of the adsorption plate, and through the internal purification plate and pipeline, the gases can be discharged or facilitated for later treatment, thereby reducing pollution to the working environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a main structural stereogram of a welding positioning mechanism of an automobile chassis of the present invention;

[0026] Figure 2 This is a three-dimensional exploded view of a support mechanism in a welding positioning mechanism for an automobile chassis of the present invention;

[0027] Figure 3 A three-dimensional diagram of a clamping mechanism in a welding positioning mechanism for an automobile chassis of the present invention;

[0028] Figure 4 This is a three-dimensional exploded view of a clamping mechanism in a welding positioning mechanism for an automobile chassis of the present invention;

[0029] Figure 5 It is a partial plan view of a clamping mechanism in a welding positioning mechanism of an automobile chassis of the present invention;

[0030] Figure 6 It is a three-dimensional exploded view of a clamping mechanism in a welding positioning mechanism of an automobile chassis of the present invention;

[0031] Figure 7 It is a side plan view of a clamping plate in a welding positioning mechanism of an automobile chassis of the present invention;

[0032] Figure 8 The present invention is a bottom-up stereoscopic view of a welding mechanism in a welding positioning mechanism for an automobile chassis.

[0033] In the figure: 1. Support mechanism; 101. Support plate; 102. Adjustment frame; 103. Fixed groove; 104. Sliding groove; 105. Electric telescopic rod; 106. Drive box; 107. Inner notch; 108. Rotating motor one; 109. Side slide plate; 2. Clamping mechanism; 201. Adsorption plate; 202. Mounting groove; 203. Inner circulation channel; 204. Engaging groove; 205. Filter plate; 206. Rotating motor two; 207. Inner adjustment plate; 208. Side fixing frame; 209. Two-way cylinder two; 210. Linkage plate; 211. Embedded groove; 212. Cylinder three; 213. Clamping plate; 214. Anti-skid pad; 215. Embedded block; 3. Welding mechanism; 301. Side connecting plate; 302. Telescopic assembly; 303. Robot arm; 304. Welding head. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 8 As shown, the present invention provides a welding positioning mechanism for an automobile chassis, comprising a supporting mechanism 1, a clamping mechanism 2 is fixedly connected between the telescopic ends of the supporting mechanism 1, and a welding mechanism 3 is fixedly connected to one side of the outer wall of the supporting mechanism 1;

[0036] The clamping mechanism 2 includes an adsorption plate 201, a mounting groove 202 is opened at the top center of the adsorption plate 201, an inner circulation channel 203 is opened inside the adsorption plate 201, a clamping groove 204 is opened at the top of the adsorption plate 201, a filter plate 205 is movably embedded in the inner surface wall of the clamping groove 204, a rotating motor 206 is fixedly inserted into the inner surface wall of the mounting groove 202, the telescopic end of the rotating motor 206 is fixedly connected with an inner adjustment plate 207, the outer surface wall of the inner adjustment plate 207 is movably sleeved with two side fixing frames 208, the top of the inner adjustment plate 207 is fixedly connected with a two-way cylinder 209, the two telescopic ends of the two-way cylinder 209 are fixedly connected with a linkage plate 210 and the bottoms of the two linkage plates 210 are fixedly connected to the top of the side fixing frame 208.

[0037] according to Figure 4 as well as Figure 6As shown: a group of embedding grooves 211 are opened on the top of the two side fixing frames 208, and a group of cylinder three 212 is fixedly connected to the top of the two side fixing frames 208. The telescopic ends of the two groups of cylinder three 212 are fixedly connected with clamping plates 213. First, the two groups of clamping plates 213 are respectively in a fixed connection state with the telescopic ends of the cylinder three 212. When the cylinder three 212 is powered on, its telescopic end begins to expand and contract, which can push the two groups of clamping plates 213 to move toward each other, thereby completing the clamping process of the automobile chassis.

[0038] according to Figure 3-Figure 4 as well as Figure 6-Figure 7 As shown: the inner surfaces of the two groups of clamping plates 213 are fixedly connected with anti-slip pads 214, the bottoms of the two groups of clamping plates 213 are fixedly connected with embedded blocks 215, and the outer surfaces of the two groups of embedded blocks 215 are slidably embedded in the embedded grooves 211, and when the two groups of cylinders 212 respectively push the two groups of clamping plates 213 to move toward each other, the embedded blocks 215 fixedly connected to the bottoms of the two groups of clamping plates 213 can move inside the embedded grooves 211, and can limit the movement of the two groups of clamping plates 213, so as to better and more stably complete the clamping of the automobile chassis.

[0039] according to Figure 2 As shown: the support mechanism 1 includes a support plate 101, and two adjustment frames 102 are fixedly connected to the top of the support plate 101. A fixing groove 103 is opened at the center of the bottom of the inner wall of the two adjustment frames 102, and a group of sliding grooves 104 are preset inside the two adjustment frames 102. First, when the fixing grooves 103 are opened at the bottom of the inner wall of the two adjustment frames 102, the electric telescopic rod 105 is fixedly inserted therein and the electric telescopic rod 105 and the adjustment frame 102 are kept in a stable state.

[0040] according to Figure 2 As shown: the inner surface walls of the two fixed grooves 103 are fixedly inserted with electric telescopic rods 105, and the telescopic ends of the two electric telescopic rods 105 are fixedly connected to the drive box 106. The telescopic ends of the two electric telescopic rods 105 are fixedly connected to the drive box 106, which can effectively push the two drive boxes 106 and the components fixed thereto to move up and down.

[0041] according to Figure 2 As shown: an inner slot 107 is provided on one side of the outer wall of the two driving boxes 106, and a rotating motor 108 is fixedly inserted into the inner surface wall of the two inner slots 107. The inner slots 107 are provided to effectively fix and insert the rotating motor 108 therein, and to maintain a fixed state between the two rotating motors 108 and the driving boxes 106.

[0042] according to Figure 2-Figure 5As shown: the outer walls of the two rotating motors 108 are fixedly connected with a set of side slides 109, and the outer walls of the two sets of side slides 109 are slidably embedded in the sliding groove 104. When the two drive boxes 106 are moving up and down, the two sets of side slides 109 can be slidably embedded in the sliding groove 104, and can limit the up and down moving paths of the two drive boxes 106.

[0043] according to Figure 8 As shown: the welding mechanism 3 includes a side connecting plate 301, a telescopic component 302 is fixedly connected to the top center of the side connecting plate 301, a mechanical arm 303 is fixedly connected to the bottom of the inner wall of the telescopic component 302, and a welding head 304 is fixedly connected to the operating end of the mechanical arm 303. The welding mechanical arm 303 automatically moves to the position to be welded according to a preset program and path, and then melts the material to be welded (such as welding wire or welding rod) and fills it into the welding head 304. When the welding head 304 contacts the automobile chassis, the welding process of the automobile chassis can be completed.

[0044] according to Figure 2-Figure 8 As shown: one side of the outer wall of the support plate 101 is fixedly connected to one side of the outer wall of the side connecting plate 301, and the telescopic ends of the two rotating motors 108 are fixedly connected to the outer wall of the adsorption plate 201. With the mutual connection of the above components, the connection among the supporting mechanism 1, the clamping mechanism 2 and the welding mechanism 3 can be effectively realized, and the position rotation of the automobile chassis can be completed, so as to better complete the welding process of the automobile chassis.

[0045] The working principle of the whole mechanism is as follows: first, before welding the automobile chassis, the automobile chassis is delivered to the top of the two side fixing frames 208 by an external conveying assembly, and according to the size of the automobile chassis, the clamping size of the clamping assembly needs to be adjusted (the distance between the four clamping plates 213 needs to be adjusted). At this time, the two-way cylinder 209 can use the linkage plate 210 as a medium under the bidirectional action, and drive the two side fixing frames 208 to move toward each other, so as to keep the two side fixing frames 208 close to and away from each other. The fixing frame 208 stops when it moves to a position suitable for the width of the automobile chassis, and then the four cylinders 212 push the two groups of clamping plates 213 to move toward each other, which can keep the anti-skid pads 214 fixed on one side of the inner wall of the four clamping plates 213 in contact with the outer wall of the automobile chassis, and complete the clamping and fixing of the automobile chassis. The four anti-skid pads 214 are in direct contact with the automobile chassis, which can effectively increase the friction between the four anti-skid pads 214 and the automobile chassis, so as to keep the device in a state of clamping the automobile chassis. Stability. Before welding, it is necessary to keep the chassis of the automobile in an optimal position. Under the push of the two electric telescopic rods 105 (the two sets of side slides 109 are respectively embedded and moved in the sliding groove 104), the two drive boxes 106 and the rotating motor 108 fixed therein can be effectively pushed to perform a height adjustment process, so as to keep the adsorption plate 201 and the components fixed thereto at an optimal height. Driven by the two rotating motors 108, the clamping mechanism 2 can be rotated, and the rotating motor 206 can drive the top inner adjustment plate 207 and the components fixed thereto to rotate. Through these two horizontal and longitudinal rotations, the position adjustment of the automobile chassis can be maintained, and in the process of rotating the automobile chassis, the welding mechanism 3 can weld the automobile chassis at any time, and the welding mechanism 3 adopts a combination of advanced welding technology and automation equipment. The welding robot automatically moves to the position to be welded according to the preset program and path. Then, welding material (such as welding wire or welding rod) is melted and filled into the welding head 304 through a welding gun or other welding tools.During the welding process, the robot can accurately control parameters such as welding speed, welding temperature and welding depth to ensure welding quality and stability. A number of sensors and monitoring systems are usually arranged inside the device to monitor various parameters and states of the welding process in real time. By collecting and analyzing these data, the system can automatically adjust the welding parameters, optimize the welding process, and improve welding efficiency and quality. This ventilation duct is connected to an external fan and is inserted at the bottom of the adsorption plate 201 to communicate with the inner circulation channel 203. During welding, the exhaust gas can continue to pass through the filter plate 205 and enter the inner circulation channel 203 inside the adsorption plate 201. A layer of activated carbon plate is arranged on the inner wall of the inner circulation channel 203 to purify harmful substances in the exhaust gas, and then discharge excess gas through the pipe to reduce pollution to the working environment.

[0046] The present invention also provides a method for welding a positioning mechanism of an automobile chassis, comprising the following steps:

[0047] Step 1: First, fix the automobile chassis before welding it. Driven by an external mobile device, the automobile chassis can be placed on top of the two side fixing frames 208. According to the size of the automobile chassis, the distance between the four clamping plates 213 needs to be adjusted. At this time, the two-way cylinder 209 can use the linkage plate 210 as a medium under the bidirectional action, and drive the two side fixing frames 208 to move toward each other, so as to keep the two side fixing frames 208 close and away from each other. When the two side fixing frames 208 move to a position relationship suitable for the width of the automobile chassis, they stop. Then, the four cylinders 3 212 push the two groups of clamping plates 213 to move toward each other, so as to keep the anti-skid pads 214 fixed on one side of the inner wall of the four clamping plates 213 in contact with the outer wall of the automobile chassis, and complete the clamping and fixing of the automobile chassis;

[0048] Step 2: With the push of the two electric telescopic rods 105, and the cooperation of the two sets of side slide plates 109 respectively embedded and moved inside the sliding groove 104, the two drive boxes 106 and the rotating motor 108 fixed therein can be effectively pushed to perform a height adjustment process, so as to keep the adsorption plate 201 and the components fixed thereto at an optimal height for welding;

[0049] Step 3: Under the drive of the two rotating motors 108, the clamping mechanism 2 can be kept rotating, and the rotating motor 206 can drive the top inner adjustment plate 207 and the components fixed thereto to rotate. Through these two lateral and longitudinal rotations, the position adjustment of the chassis of the automobile can be maintained;

[0050] Step 4: When the position of the automobile chassis is adjusted, the welding mechanism 3 can maintain the contact between the welding head 304 fixed on the top and the automobile chassis under the rotation of its own mechanical arm 303, thereby completing the welding process of the automobile chassis.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding positioning mechanism for an automobile chassis, characterized in that: It comprises a support mechanism (1), a clamping mechanism (2) is fixedly connected between the telescopic ends of the support mechanism (1), and a welding mechanism (3) is fixedly connected to one side of the outer wall of the support mechanism (1); The clamping mechanism (2) comprises an adsorption plate (201), a mounting groove (202) is provided at the center of the top of the adsorption plate (201), an inner circulation channel (203) is provided inside the adsorption plate (201), a clamping groove (204) is provided at the top of the adsorption plate (201), a filter plate (205) is movably embedded in the inner surface wall of the clamping groove (204), a second rotating motor (206) is fixedly inserted into the inner surface wall of the mounting groove (202), an inner adjustment plate (207) is fixedly connected to the telescopic end of the second rotating motor (206), two side fixing frames (208) are movably sleeved on the outer surface wall of the inner adjustment plate (207), and a second bidirectional cylinder (209) is fixedly connected to the top of the inner adjustment plate (207). The two telescopic ends of the two-way cylinder (209) are fixedly connected to a linkage plate (210), and the bottoms of the two linkage plates (210) are fixedly connected to the top of the side fixing frame (208); a group of embedding grooves (211) are opened on the tops of the two side fixing frames (208), and a group of cylinders (212) are fixedly connected to the tops of the two side fixing frames (208), and the telescopic ends of the two groups of cylinders (212) are fixedly connected to clamping plates (213); the inner surfaces of the two groups of clamping plates (213) are fixedly connected to anti-slip pads (214), and the bottoms of the two groups of clamping plates (213) are fixedly connected to embedding blocks (215), and the outer surfaces of the two groups of embedding blocks (215) are slidably embedded in the embedding grooves (211); The support mechanism (1) comprises a support plate (101), the top of the support plate (101) is fixedly connected to two adjustment frames (102), a fixing groove (103) is provided at the center of the bottom of the inner wall of the two adjustment frames (102), and a group of sliding grooves (104) are preset inside the two adjustment frames (102); the inner surface walls of the two fixing grooves (103) are fixedly inserted with electric telescopic rods (105), and the telescopic ends of the two electric telescopic rods (105) are fixedly connected to a driving box (106); one side of the outer wall of the two driving boxes (106) is provided with an inner notch (107), and the inner surface walls of the two inner notches (107) are fixedly inserted with a rotating motor (108).

2. The welding positioning mechanism for an automobile chassis according to claim 1, characterized in that: The outer walls of the two rotating motors (108) are both fixedly connected to a set of side slide plates (109), and the outer walls of the two sets of side slide plates (109) are both slidably embedded in the interior of the sliding groove (104).

3. The welding positioning mechanism for an automobile chassis according to claim 2, characterized in that: The welding mechanism (3) comprises a side connecting plate (301), a telescopic assembly (302) being fixedly connected to the top center of the side connecting plate (301), a mechanical arm (303) being fixedly connected to the bottom of the inner wall of the telescopic assembly (302), and a welding head (304) being fixedly connected to the operating end of the mechanical arm (303).

4. The welding positioning mechanism for an automobile chassis according to claim 3, characterized in that: One side of the outer wall of the support plate (101) is fixedly connected to one side of the outer wall of the side connection plate (301), and the telescopic ends of the two rotating motors (108) are fixedly connected to the outer wall of the adsorption plate (201).

5. A method for welding a positioning mechanism for an automobile chassis, using the welding positioning mechanism for an automobile chassis according to claim 4, comprising the following steps: S1: First, the automobile chassis is fixed before welding. The automobile chassis can be placed on top of the two side fixing frames (208) by the external mobile device. According to the size of the automobile chassis, the distance between the four clamping plates (213) needs to be adjusted. At this time, the two-way cylinder (209) can use the linkage plate (210) as a medium under the bidirectional action and drive the two side fixing frames (208) to move toward each other, thereby maintaining the two side fixing frames (208) close to and away from each other. When the two side fixing frames (208) move to a position relationship suitable for the width of the automobile chassis, they stop. Then, the four cylinders (212) respectively push the two groups of clamping plates (213) to move toward each other, so that the anti-skid pads (214) fixed on one side of the inner wall of the four clamping plates (213) can be kept in contact with the outer wall of the automobile chassis, and the clamping and fixing of the automobile chassis is completed; S2: With the push of the two electric telescopic rods (105), and the cooperation of the two sets of side slide plates (109) being embedded and moved in the sliding grooves (104), the two drive boxes (106) and the rotating motor 1 (108) fixed therein can be effectively pushed to perform a height adjustment process, thereby keeping the adsorption plate (201) and the components fixed thereto at an optimal height for welding; S3: Under the drive of the two rotating motors 1 (108), the clamping mechanism (2) can be kept rotating, and the rotating motor 2 (206) can drive the top inner adjustment plate (207) and the components fixed thereto to rotate, and through these two lateral rotations and longitudinal rotations, the position adjustment of the automobile chassis can be maintained; S4: When the position of the automobile chassis is adjusted, the welding mechanism (3) can maintain the contact between the welding head (304) fixed at the top and the automobile chassis under the rotation of the components of its own mechanical arm (303), thereby completing the welding process of the automobile chassis.

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