Semi-automatic welding equipment for metal door panel processing

Abstract

The present invention relates to the field of welding technology, and specifically to a semi-automatic welding device for metal door panel processing, including a welding fixture, the welding fixture including a supporting main rod, a rocker arm, a swing arm, a pressure arm and an elastic telescopic rod, a magnetic block is arranged on one side of the lower part of the supporting main rod, the magnetic block is used to be sucked on the metal door panel, and the rocker arm is threadedly connected to the supporting main rod. The present invention is provided with a welding fixture, when the welding fixture presses gusset plates of different thicknesses, through the cooperation of the elastic telescopic rod and the piston limit column, the pressing force of the pressing head on the gusset plate can be basically consistent, avoiding the difference in welding quality between gusset plates of different thicknesses and metal door panels due to different pressing forces, and it is also more convenient for the staff to operate, no matter how thick the gusset plate is, as long as the rocker arm is swung inward until it can no longer be swung in, so the rocker arm will not be swung inward at different distances due to different hand strengths of the staff.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a semi-automatic welding device for processing metal door panels. Background Art

[0002] When processing metal door panels, it is necessary to weld the gusset plates to the metal door panels to connect the hinge shafts. Specifically, workers need to use clamps to fix the position of the gusset plates. Only after the position of the gusset plates is completely fixed by the clamps can a welding gun be used to weld the gusset plates to the metal door panels.

[0003] The clamps used for plate welding in the prior art are mainly divided into two categories, one is a manual clamp, which increases the holding force by threaded feeding, and the other is a pneumatic or hydraulic clamp, which sets the feeding distance in advance by a hydraulic press or an air press. Manual clamps are suitable for welding non-batch welds, while pneumatic clamps are suitable for batch welds. For welding gussets on metal door panels, the operating environment of pneumatic clamps is limited, and hydraulic presses or air presses are required. Therefore, manual clamps are generally used. After switching between gussets of different thicknesses, the manual clamp requires the worker to turn the handle to adjust the holding force between the clamp and the current gusset. The adjustment of the holding force is usually based on the worker's experience to determine whether the holding force is appropriate, and there is no guarantee that the clamp's holding force for gussets of different thicknesses is basically the same, so there will be certain differences in the welding quality of the welding parts. Summary of the invention

[0004] Based on this, it is necessary to provide a semi-automatic welding equipment for metal door panel processing to address the problems existing in the current welding fixtures, so as to solve the problem that when the manual fixture is pressing the buckle plate, it cannot ensure that the holding force of the fixture on buckle plates of different thicknesses is basically consistent.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A semi-automatic welding device for metal door panel processing is used to weld a gusset plate to a metal door panel. The semi-automatic welding device for metal door panel processing comprises:

[0007] The welding fixture includes a supporting main rod, a rocker arm, a swing arm, a pressure arm and an elastic telescopic rod. A magnetic block is arranged on one side of the lower part of the supporting main rod, and the magnetic block is used to be sucked on the metal door panel. The rocker arm is threadedly connected to the supporting main rod, and a slider is sleeved on the non-handheld end of the rocker arm. The slider and the rocker arm can move synchronously and rotate relatively.

[0008] The upper part of the slider is hinged to one end of the elastic telescopic rod, the other end of the elastic telescopic rod is hinged to the pressure arm, the non-pressing end of the pressure arm is hinged to the upper side of the swing arm, the swing arm is C-shaped, one end of the swing arm is hinged to the upper part of the supporting main rod and is located directly above the magnetic block, and the other end of the swing arm is hinged to a pressing head, which is used to press the buckle plate;

[0009] A first hydraulic cylinder is provided at one end of the slider away from the rocker arm, a second oil chamber is provided at the telescopic portion of the elastic telescopic rod, a piston limiting column is slidably connected to one end of the second oil chamber, a first oil chamber is provided in the first hydraulic cylinder, and the first oil chamber is communicated with the second oil chamber;

[0010] The first oil chamber is configured so that when the rocker arm is swung outward, the volume of the first oil chamber decreases.

[0011] In one of the embodiments, after the pressing arm is pressed down, the hinge points between the slider and the elastic telescopic rod, the hinge points between the elastic telescopic rod and the pressing arm, and the hinge points between the pressing arm and the swing arm are located on the same straight line.

[0012] In one of the embodiments, after the pressing arm is pressed down, the piston limiting column can abut against the fixed portion of the elastic telescopic rod.

[0013] In one embodiment, the first hydraulic cylinder includes a cylinder body, a piston ring and a connecting rod, the cylinder body is fixedly connected to the slider, one end of the connecting rod is fixedly connected to the supporting main rod, and the other end of the connecting rod passes through the cylinder body and is fixedly connected to the piston ring.

[0014] In one of the embodiments, a rubber pad is provided on the lower end surface of the pressing head.

[0015] In one of the embodiments, a linear slide groove is provided on the upper surface of the supporting main rod, and the sliding block is slidably connected in the linear slide groove.

[0016] In one of the embodiments, a welding assembly is provided at the upper end of the pressing head, and the welding assembly is used to weld the gusset plate to the metal door panel.

[0017] In one embodiment, the welding assembly includes a welding gun, a moving unit and a connecting bracket, the connecting bracket is arranged on the upper surface of the pressing head, the moving unit is arranged on the connecting bracket, and the telescopic part of the moving unit is fixedly connected to the welding gun.

[0018] In one embodiment, the movable unit includes a transverse connecting block and a second hydraulic cylinder. The transverse connecting block is fixedly connected to the connecting bracket. A dovetail groove is provided on the transverse connecting block. The dovetail groove extends along the length direction of the transverse connecting block. The cylinder body of the second hydraulic cylinder is provided with a dovetail guide block. The dovetail guide block is slidably connected in the dovetail groove.

[0019] In one of the embodiments, a third hydraulic cylinder is provided at the connection between the supporting main rod and the swing arm, the third hydraulic cylinder is connected to the second hydraulic cylinder, and the third hydraulic cylinder is configured so that when the swing arm swings to the left, the telescopic part of the second hydraulic cylinder drives the welding gun to move downward.

[0020] The beneficial effects of the present invention are:

[0021] The present invention is provided with a welding clamp. When the welding clamp presses the gusset plates of different thicknesses, the cooperation of the elastic telescopic rod and the piston limit column can make the pressing force of the pressing head on the gusset plates basically consistent, thereby avoiding the difference in welding quality between the gusset plates of different thicknesses and the metal door panels due to different pressing forces. In addition, it is more convenient for the staff to operate. No matter what the thickness of the gusset plate is, it is sufficient to just swing the rocker arm inwards until it can no longer be swinged in. Therefore, the different inward swinging distances of the rocker arm will not be caused by the different hand strengths of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is an overall schematic diagram of a semi-automatic welding device for metal door panel processing of the present invention;

[0023] Figure 2 A cross-sectional view of a semi-automatic welding device for metal door panel processing according to the present invention;

[0024] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle;

[0025] Figure 4 for Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0026] Figure 5 It is a top view of a semi-automatic welding device for metal door panel processing according to the present invention;

[0027] Figure 6 for Figure 5 Middle CC section cutaway view;

[0028] Figure 7 for Figure 6 Schematic diagram of the enlarged structure at D in the middle.

[0029] in:

[0030] 100, welding fixture; 110, supporting main rod; 111, linear slide; 120, rocker arm; 130, swing arm; 140, pressure arm; 150, elastic telescopic rod; 160, magnetic block; 170, slider; 180, pressure holding head; 210, first hydraulic cylinder; 211, first oil chamber; 212, cylinder body; 213, piston ring; 214, connecting rod; 220, second oil chamber; 230, piston limit column; 240, compression spring; 300, welding assembly; 310, welding gun; 320, moving unit; 321, transverse connecting block; 3211, dovetail groove; 3212, dovetail guide block; 322, second hydraulic cylinder; 323, third hydraulic cylinder; 3231, fixed baffle; 3232, rotating baffle; 330, connecting bracket; 1000, metal door panel; 1100, buckle plate. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings. In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] like Figure 1-Figure 7As shown, a semi-automatic welding device for metal door panel processing is used to weld a gusset plate 1100 to a metal door panel 1000. The semi-automatic welding device for metal door panel processing includes a welding fixture 100, and the welding fixture 100 includes a supporting main rod 110, a rocker arm 120, a swing arm 130, a pressure arm 140 and an elastic telescopic rod 150. A magnetic block 160 is arranged on one side of the lower part of the supporting main rod 110, and the magnetic block 160 is used to be sucked on the metal door panel 1000. The rocker arm 120 is threadedly connected to the supporting main rod 110. A slider 170 is sleeved on the non-handheld end of the rocker arm 120. The slider 170 and the rocker arm 120 can move synchronously and rotate relative to each other. The upper part of the slider 170 is hinged to one end of the elastic telescopic rod 150, and the other end of the elastic telescopic rod 150 is hinged. On the pressing arm 140, the non-pressing end of the pressing arm 140 is hinged to the upper side of the swing arm 130. The swing arm 130 is C-shaped. One end of the swing arm 130 is hinged to the upper part of the supporting main rod 110 and is located directly above the magnetic block 160. The other end of the swing arm 130 is hinged with a pressing head 180, and the pressing head 180 is used to press the buckle plate 1100. The end of the slider 170 away from the rocker arm 120 is provided with a first hydraulic cylinder 210, and the telescopic part of the elastic telescopic rod 150 is provided with a second oil chamber 220. One end of the second oil chamber 220 is slidably connected with a piston limit column 230. The first hydraulic cylinder 210 has a first oil chamber 211, and the first oil chamber 211 is connected to the second oil chamber 220. The first oil chamber 211 is configured so that when the rocker arm 120 is swung outward, the volume of the first oil chamber 211 decreases.

[0035] It should also be noted that after the pressing arm 140 is pressed down, the hinge points of the slider 170 and the elastic telescopic rod 150, the hinge points of the elastic telescopic rod 150 and the pressing arm 140, and the hinge points of the pressing arm 140 and the swing arm 130 are located on the same straight line.

[0036] It should be additionally explained that after the pressing arm 140 is pressed down, the piston limiting column 230 abuts against the fixed portion of the elastic telescopic rod 150 .

[0037] It should also be noted that the first hydraulic cylinder 210 includes a cylinder body 212, a piston ring 213 and a connecting rod 214. The cylinder body 212 is fixedly connected to the slider 170, one end of the connecting rod 214 is fixedly connected to the supporting main rod 110, and the other end of the connecting rod passes through the cylinder body 212 and is fixedly connected to the piston ring 213.

[0038] When in use, the staff first sucks the magnetic block 160 to the appropriate position on the metal door panel 1000, and then places the pinch plate 1100 on the metal door panel 1000 to be welded. Next, the staff presses the pressing arm 140 to the lower limit position by hand, so that the hinge point of the slider 170 and the elastic telescopic rod 150, the hinge point of the elastic telescopic rod 150 and the pressing arm 140, and the hinge point of the pressing arm 140 and the swing arm 130 are in the same straight line. At this time, the pressing head 180 is located above the pinch plate 1100. Next, the staff shakes the rocker 120 inward, so that the slider 170 moves to the right with the rocker 120, so that the slider 170 pushes the elastic telescopic rod 150, the elastic telescopic rod 150 pushes the pressing arm 140, the pressing arm 140 pushes the swing arm 130, and the swing arm 130 is forced to swing downward until the pressing head 180 contacts the upper surface of the pinch plate 1100. At this time, as the staff continues to shake the rocker 120 20, the compression amount of the compression spring 240 is further increased, and the elastic telescopic rod 150 is gradually shortened. At the same time, due to the movement of the slider 170 to the right, the volume of the first oil chamber 211 increases. Under the action of negative pressure suction, the hydraulic oil in the second oil chamber 220 is sucked into the first oil chamber 211, and the piston limit column 230 is forced to move in the direction away from the fixed part of the elastic telescopic rod 150, so that the compression spring 240 can be compressed to a longer length, so that the holding head 180 can provide sufficient holding force on the buckle plate 1100 to prevent the buckle plate 1100 from slipping relative to the metal door panel 1000 during welding. As the rocker arm 120 continues to rock, the piston limit column 230 gradually abuts against the fixed part of the elastic telescopic rod 150. The length of the elastic telescopic rod 150 can no longer be shortened at this time, and the rocker arm 120 can no longer be rocked inward. At this time, the welding fixture 100 completes the holding of the buckle plate 1100.

[0039] When welding the next gusset plate 1100, the worker first lifts the pressure arm 140 to the upper limit position, so that the hinge points of the slider 170 and the elastic telescopic rod 150, the hinge points of the elastic telescopic rod 150 and the pressure arm 140, and the hinge points of the pressure arm 140 and the swing arm 130 are no longer on the same straight line. At this time, the elastic force of the compression spring 240 is released, and under the action of the compression spring 240, the elastic telescopic rod 150 returns to its original length. Next, the magnetic block 160 is attracted to the next suitable position of the metal door panel 1000, and then the next The gusset plate 1100 to be welded is placed at the corresponding welding position. If the thickness of the next gusset plate 1100 to be welded is less than the thickness of the current gusset plate 1100, after the staff presses the pressure arm 140 to the lower limit position, the swing arm 130 swings to the right by a distance greater than the swing distance of the swing arm 130 when the gusset plate 1100 before welding is welded. At this time, the compression amount of the compression spring 240 is less than the compression amount of the compression spring 240 when the gusset plate 1100 before welding is welded. Therefore, the piston limit column 230 at this time does not engage with the elastic telescopic rod 15 0, but there is a small distance between them, so the staff can continue to shake the rocker arm 120 inwards. Until the rocker arm 120 can no longer shake, it means that the piston limit column 230 is in contact with the fixed part of the elastic telescopic rod 150. At this time, the compression spring 240 is further compressed for a small distance, ensuring that the compression amount of the compression spring 240 is basically the same when the thickness of the pinch plate 1100 is different, thereby ensuring that the pressing force of the holding head 180 on the pinch plates 1100 of different thicknesses is basically the same, avoiding the problem of The different holding forces result in different welding qualities between the gusset plates 1100 and the metal door panels 1000 of different thicknesses, and the operation is more convenient for the staff. No matter how thick the gusset plates 1100 are, they only need to swing the rocker arm 120 inward until it cannot be further swing in. Since the rocker arm 120 cannot be further swing in because the piston limit column 230 is abutting against the fixed part of the elastic telescopic rod 150, the inward swing distance of the rocker arm 120 will not be different due to the different hand strength of the staff.

[0040] It should be supplemented that, in the present embodiment, the feed speed of the slider 170 should be slightly greater than the feed speed of the piston limit column 230. This is because when the pressure arm 140 is pressed down to the lower limit position, the elastic telescopic rod 150 is perpendicular to the slider 170. At this time, when the rocker arm 120 is shaken, the slider 170 and the elastic telescopic rod 150 have the same feed amount per unit time, so that the feed speed of the slider 170 is slightly greater than the feed speed of the piston limit column 230. Then, when the elastic telescopic rod 150 contracts and the piston limit column 230 moves away from the fixed part of the elastic telescopic rod 150, the piston limit column 230 can be made to abut against the bottom of the fixed end of the elastic telescopic rod 150.

[0041] It should also be noted that the maximum thickness of the pinch plate 1100 that can be pressed by the present invention has an upper limit, and when the pinch plate 1100 of the maximum thickness is pressed, the swing arm 130 is in a horizontal state.

[0042] In a further embodiment, a rubber pad is provided on the lower end surface of the pressing head 180 .

[0043] A rubber pad is provided on the lower end surface of the pressing head 180. The rubber pad is provided to prevent slipping on the one hand, and to prevent the pressing head 180 from leaving an indentation on the surface of the buckle plate 1100 on the other hand, thereby affecting product quality.

[0044] In a further embodiment, Figure 1 As shown, a linear slide groove 111 is provided on the upper surface of the supporting main rod 110 , and the slider 170 is slidably connected in the linear slide groove 111 .

[0045] The linear slide groove 111 is provided to guide and limit the movement of the slider 170 .

[0046] In a further embodiment, Figure 1 , Figure 2 and Figure 7 As shown, a welding assembly 300 is provided at the upper end of the pressing head 180, and the welding assembly 300 is used to weld the gusset plate 1100 to the metal door panel 1000. The welding assembly 300 includes a welding gun 310, a moving unit 320 and a connecting bracket 330. The connecting bracket 330 is arranged on the upper surface of the pressing head 180, and the moving unit 320 is arranged on the connecting bracket 330. The telescopic part of the moving unit 320 is fixedly connected to the welding gun 310. The moving unit 320 includes a transverse connecting block 321 and a second hydraulic cylinder 322. The transverse connecting block 321 is fixedly connected to the connecting bracket 330. A dovetail groove 3211 is provided on the transverse connecting block 321, and the dovetail groove 3211 extends along the length direction of the transverse connecting block 321. A dovetail guide block 3212 is provided on the cylinder body 212 of the second hydraulic cylinder 322, and the dovetail guide block 3212 is slidably connected in the dovetail groove 3211. A third hydraulic cylinder 323 is provided at the connection between the supporting main rod 110 and the swing arm 130, and the third hydraulic cylinder 323 is connected to the second hydraulic cylinder 322. The third hydraulic cylinder 323 is configured so that when the swing arm 130 swings to the left, the telescopic part of the second hydraulic cylinder 322 drives the welding gun 310 to move downward.

[0047] When the pressure head 180 is in contact with the pinch plate 1100 and the pressure arm 140 is pressed down, the swing arm 130 swings to the right at a large angle, and the angle between the rotating baffle 3232 and the fixed baffle 3231 becomes much larger, so the volume of the third hydraulic cylinder 323 increases a lot. Since the third hydraulic cylinder 323 is connected to the second hydraulic cylinder 322, under the action of negative pressure suction, a large amount of hydraulic oil in the second hydraulic cylinder 322 is sucked into the third hydraulic cylinder 323, and the welding gun 310 moves a large distance upward following the piston of the second hydraulic cylinder 322 to adapt to the pinch plate 1100 with a small thickness, so that the muzzle of the welding gun 310 is located at the contact position between the metal door panel 1000 and the pinch plate 1100. Next, the welding gun 310 is started so that the welding gun 310 and the dovetail guide block 3212 slide along the dovetail groove 3211, thereby welding the pinch plate 1100 to the metal door panel 1000.

[0048] For the thick gusset plate 1100, when the holding head 180 is in contact with the gusset plate 1100 and the pressing arm 140 has been pressed down, the swing angle of the swing arm 130 to the right is small, and the angle between the rotating baffle 3232 and the fixed baffle 3231 increases less, so the volume of the third hydraulic cylinder 323 increases less. Therefore, under the action of negative pressure suction, the amount of hydraulic oil in the second hydraulic cylinder 322 sucked into the third hydraulic cylinder 323 is small, and the welding gun 310 follows the piston of the second hydraulic cylinder 322 to move upward a small distance to adapt to the thick gusset plate 1100, so that the muzzle of the welding gun 310 is located at the contact position between the metal door panel 1000 and the gusset plate 1100, and then the welding gun 310 is started so that the welding gun 310 and the dovetail guide block 3212 slide along the dovetail groove 3211, thereby welding the gusset plate 1100 to the metal door panel 1000.

[0049] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A semi-automatic welding device for metal door panel processing, used for welding a gusset plate to a metal door panel, characterized in that: include: The welding fixture includes a supporting main rod, a rocker arm, a swing arm, a pressure arm and an elastic telescopic rod. A magnetic block is arranged on one side of the lower part of the supporting main rod, and the magnetic block is used to be sucked on the metal door panel. The rocker arm is threadedly connected to the supporting main rod, and a slider is sleeved on the non-handheld end of the rocker arm. The slider and the rocker arm can move synchronously and rotate relatively. The upper part of the slider is hinged to one end of the elastic telescopic rod, the other end of the elastic telescopic rod is hinged to the pressure arm, the non-pressing end of the pressure arm is hinged to the upper side of the swing arm, the rocker arm and the swing arm are respectively located at the two ends of the supporting main rod, the swing arm is C-shaped, one end of the swing arm is hinged to the upper part of the supporting main rod and is located directly above the magnetic block, and the other end of the swing arm is hinged with a pressing head, which is used to press the buckle plate; A first hydraulic cylinder is provided at one end of the slider away from the rocker arm, a second oil chamber is provided at the telescopic portion of the elastic telescopic rod, a compression spring is provided between the elastic telescopic rod and the second oil chamber, a piston limiting column is slidably connected to one end of the second oil chamber, a first oil chamber is provided in the first hydraulic cylinder, and the first oil chamber is communicated with the second oil chamber; When the cam is in the state of being moved out of the way, the cam will be in a state of being moved out of the way and the movement of the cam will cause the cam to move in a direction opposite to the direction of the cam, and the cam will move in a direction opposite to the direction of the cam. The holding head is located above the buckle plate. Next, the staff drives the rocker arm to swing inward, so that the slider moves to the right with the rocker arm, the slider pushes the elastic telescopic rod, the elastic telescopic rod pushes the pressure arm, and the pressure arm pushes the swing arm. The swing arm is forced to swing downward until the holding head contacts the upper surface of the buckle plate. As the staff continues to shake the rocker arm, the compression of the compression spring further increases, and the elastic telescopic rod gradually shortens. At the same time, due to the movement of the slider to the right, the volume of the first oil chamber increases. Under the action of negative pressure suction, the hydraulic oil in the second oil chamber is sucked into the first oil chamber, and the piston limit column is forced to move in the direction away from the fixed part of the elastic telescopic rod so that the compression spring can be compressed to a longer length, thereby allowing the holding head to provide sufficient holding force on the buckle plate; as the rocker arm continues to swing, the piston limit column gradually abuts against the fixed part of the elastic telescopic rod. The length of the elastic telescopic rod can no longer be shortened at this time, and the rocker arm can no longer be swung inward. At this time, the welding fixture completes the pressing of the buckle plate.

2. The semi-automatic welding equipment for metal door panel processing according to claim 1 is characterized in that: The lower end surface of the pressing head is provided with a rubber pad.

3. The semi-automatic welding equipment for metal door panel processing according to claim 1 is characterized in that: The upper end of the pressing head is provided with a welding assembly, and the welding assembly is used for welding the gusset plate to the metal door panel.

4. The semi-automatic welding equipment for metal door panel processing according to claim 3 is characterized in that: The welding assembly comprises a welding gun, a moving unit and a connecting bracket, wherein the connecting bracket is arranged on the upper surface of the pressing head, the moving unit is arranged on the connecting bracket, and the telescopic part of the moving unit is fixedly connected to the welding gun.

5. The semi-automatic welding equipment for metal door panel processing according to claim 4 is characterized in that: The moving unit includes a transverse connecting block and a second hydraulic cylinder. The transverse connecting block is fixedly connected to the connecting bracket. A dovetail groove is provided on the transverse connecting block. The dovetail groove extends along the length direction of the transverse connecting block. The cylinder body of the second hydraulic cylinder is provided with a dovetail guide block. The dovetail guide block is slidably connected in the dovetail groove.

6. The semi-automatic welding equipment for metal door panel processing according to claim 5, characterized in that: A third hydraulic cylinder is provided at the connection between the supporting main rod and the swing arm. The third hydraulic cylinder is connected to the second hydraulic cylinder. The third hydraulic cylinder is configured so that when the swing arm swings to the left, the telescopic part of the second hydraulic cylinder drives the welding gun to move downward.

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