A backing plate welding device and welding method

Abstract

The invention discloses a pad welding device and a welding method, which relate to the technical field of welding and include a welding platform and a welding gun. A positioning through hole is arranged on the welding platform, a sliding support plate is arranged in the positioning through hole, a loading box is arranged on the top of the welding platform and can be raised and lowered, a plurality of fixed plates are arranged in the loading box, a front door and a rear door are arranged at the bottom of the loading box, a limiting groove is arranged on the front side of the front door; a first loading mechanism is arranged on the right side of the welding platform, and a second loading mechanism is arranged on the front side of the welding platform; by setting a positioning through hole on the welding platform, the bottom plate to be welded can be positioned and limited, the bottom plate can be loaded by the first loading mechanism, the fixed seat can be loaded by the second loading mechanism, the fixed plate can be stored, continuously loaded, and limited and fixed by the loading box, and the positioning, limiting, and limiting clamping of the fixed seat can also be completed simultaneously, the structure is simplified, the operation is simple, and the efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of backing plate welding, and in particular relates to a backing plate welding device and a welding method. Background Art

[0002] Among the related equipment of rail transit, the pad is one of the components of railway rail transit. Figure 1 As shown, the pad includes a bottom plate, and a fixing plate and a fixing seat are welded on the bottom plate. When welding the pad, generally the bottom plate should be placed in the positioning groove of the welding platform first and clamped with a clamping member, then the fixing plate should be placed on the bottom plate, and then the fixing plate should be measured and positioned to the specified position of the bottom plate, and then the fixing plate should be clamped, and then the fixing seat should be placed on the bottom plate again, and the position of the fixing seat should be repeatedly measured and positioned, and after the positioning of the fixing seat is completed, the fixing seat should be fixed, and then the welding gun should be used to weld the fixing seat and the fixing plate.

[0003] However, in the actual implementation process of the above-mentioned pad welding device or method, it was found that there are areas that need to be improved: the loading of the bottom plate, the fixed plate and the fixed seat needs to be done manually, and repeated marking and measurement are required when positioning the bottom plate and the fixed plate. In addition, after the welding is completed, workers are required to knock on the fixed seat and the fixed plate to detect the welding firmness. The overall operation is relatively cumbersome and inconvenient, and the efficiency is low. Summary of the invention

[0004] In view of the shortcomings and defects in the prior art, an object of the present invention is to provide a pad welding device to solve the problems of the pad welding device in the prior art that the overall operation is relatively cumbersome and inconvenient and the efficiency is low.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a pad welding device, including a welding platform and a welding gun, the welding gun is arranged at the welding platform, and is used to weld the fixed plate and the fixed seat to the base plate, the welding platform is provided with a positioning through hole matching the size of the base plate, the positioning through hole is provided with a sliding support plate that can open or close the positioning through hole, after the base plate is positioned and placed on the sliding support plate, the upper plane of the base plate is higher than the upper plane of the welding platform, a loading box is provided above the welding platform, and the outlet of the loading box is directly opposite to the welding position of the fixed plate, and the loading box is provided with a material. A plurality of fixed plates are installed, and a front door that can be slid forward and opened and a rear door that can be opened backward are provided at the bottom of the loading box. When the front door and the rear door are closed, they are used to support the fixed plates in the loading box. When the front door and the rear door are opened, the fixed plates at the bottom layer fall onto the bottom plate, and a limiting groove is provided on the front side of the front door. After the front door is opened in place, the limiting groove is used to position and limit the base; a tightening piece is provided on the front side wall in the loading box, and the tightening piece is connected to the front door. When the front door slides forward and opens, the front door drives the tightening piece to clamp the fixed plates at the second bottom layer in the loading box;

[0006] A first loading mechanism is provided on the right side of the welding platform, and the first loading mechanism is used to load the base plate onto the sliding support plate of the welding platform, and in the process of loading, the upper surface of the base plate is cleaned; a second loading mechanism is provided on the front side of the welding platform, and the second loading mechanism includes a second push plate, and the cross-sectional shape of the second push plate is U-shaped. The second push plate is used to push the fixed seat into the limiting groove, and in the process of pushing the fixed seat, the bottom surface of the fixed seat is cleaned, and after the fixed seat is in place, the second push plate contacts the front door.

[0007] As a further improvement of the present invention, a first brush surface is provided on the upper plane of the front door and the rear door. When the front door and the rear door are opened, the first brush surface is used to clean the bottom surface of the fixed plate.

[0008] As a further improvement of the present invention, the first loading mechanism includes a first loading platform, a placement slot is provided on the first loading platform, a lifting and lowering support plate is provided in the placement slot, a plurality of bottom plates are placed on the lifting and lowering support plate in the placement slot, a first horizontally retractable electric push rod is provided on the right side of the first loading platform, a first push plate is provided on the telescopic rod of the first electric push rod, and the first electric push rod is used to push the bottom plate into the positioning through hole of the welding platform; a cleaning rod is provided on the first loading platform above the placement slot and can be lifted and lowered. A second brush surface is provided on the bottom surface of the cleaning rod, and the second brush surface is used to clean the upper plane of the bottom plate.

[0009] As a further improvement of the present invention, the second loading mechanism also includes a second loading table and a second electric push rod. A raising platform is provided on the welding platform on the front side of the positioning through hole. The upper plane of the second loading table, the upper plane of the bottom plate located above the sliding tray, and the upper plane of the raising platform are all in the same plane. The second push plate is connected to the second loading table through the second electric push rod. A third brush surface is provided on the raising platform, and the third brush surface is used to clean the lower plane of the fixed plate.

[0010] As a further improvement of the present invention, a notch groove is provided at the bottom of the front wall of the loading box and the bottom of the rear wall of the loading box, and the front door and the rear door are connected in the notch groove of the loading box so as to slide back and forth. The bottom of the front door and the rear door are flush with the bottom of the loading box, and a connecting plate is fixed to the front end on the left and right sides of the front door and the rear end on the left and right sides of the rear door, and each connecting plate is connected to the loading box through a fourth electric push rod.

[0011] As a further improvement of the present invention, the clamping member includes a lower rack, an upper rack and a plurality of gears meshingly connected in sequence, a slot is provided in the front side wall of the loading box, the upper rack is slidably arranged above the slot, the lower rack is fixedly arranged on the upper plane of the front door, the gears are an odd number, and a plurality of gears are rotatably arranged in the slot from top to bottom, and the lower rack is meshingly connected to the upper rack through a plurality of gears.

[0012] As a further improvement of the present invention, a strip groove is provided on the inner wall of the rear side of the loading box, the strip groove corresponds to the position of the fixed plate of the second bottom layer in the loading box, and the upper and lower heights of the strip groove are greater than the thickness of the fixed plate, and an anti-slip rubber pad is provided in the strip groove.

[0013] As a further improvement of the present invention, it also includes a sliding rail groove, which is arranged parallel to the outer side of the welding position of the fixed plate and the fixed seat, and a sliding block is slidably provided in the sliding rail groove, and a rotating block is horizontally rotatably connected to the sliding block, and the rotating block is hinged with a first telescopic member on the side away from the sliding rail groove so as to be rotatable up and down through a hinge shaft, and the hinge shaft is connected to a motor driving it to rotate, and the welding gun is fixed on the telescopic rod of the first telescopic member.

[0014] As a further improvement of the present invention, the sliding rail groove is arranged at the bottom of the material receiving box, the front door, the rear door, and the second push plate, including a first sliding rail groove, a second sliding rail groove and a connecting sliding rail groove. After the front door and the rear door open the material feeding box into place, and after the second push plate pushes the fixed seat into place, the first sliding rail groove is on the outside above the line of the welding position of the fixed plate, and the second sliding rail groove is on the outside above the line of the welding position of the fixed seat. The first sliding rail groove is connected to the second sliding rail groove through the connecting sliding rail groove.

[0015] A welding method for welding a backing plate using a backing plate welding device comprises the following steps:

[0016] (1) Preparation: The loading box moves upward, the sliding support plate closes the positioning through hole, the front door and the rear door close the bottom of the loading box, and multiple fixing plates are installed in the loading box. The bottom plate is placed on the first loading platform, and the fixing seat is placed in the second pushing plate on the second loading platform;

[0017] (2) Positioning, loading and limiting: The first loading mechanism loads the bottom plate onto the sliding support plate of the positioning through hole to complete the positioning, loading and limiting of the bottom plate, and in the process of loading the bottom plate, the upper surface of the bottom plate is cleaned; the loading box moves downward and approaches the bottom plate until the distance between the bottom of the loading box and the bottom plate is less than the thickness of the fixed plate and greater than three-quarters of the thickness of the fixed plate, the front door and the rear door are opened to both sides, and the bottom fixed plate in the loading box falls on the bottom plate, completing the positioning, loading and limiting of the fixed plate; the second loading mechanism pushes the fixed seat onto the bottom plate and clamps the fixed seat into the limiting groove of the front door to complete the positioning, loading and limiting of the fixed seat, and in the process of pushing the fixed seat, the lower surface of the fixed seat is cleaned;

[0018] (3) Welding: The welding gun welds the fixing plate and the fixing seat along the outer sides of the fixing plate and the fixing seat;

[0019] (4) Preliminary test of welding firmness: Push the front door and the rear door backwards. If the front door can push the fixed plate, it means that the welding of the fixed plate is not firm. Otherwise, it means that the welding firmness of the fixed plate is preliminarily qualified. The second push plate retracts forward first, and then pushes the front door forward. If the front door can push the fixed seat, it means that the welding of the fixed seat is not firm. Otherwise, it means that the welding firmness of the fixed seat is preliminarily qualified.

[0020] (5) Unloading: The sliding support plate opens the positioning hole, the loading box moves downward, and the loading box pushes the bottom plate to fall from the positioning hole of the welding platform to complete the unloading of the bottom plate; then the loading box moves upward, and at the same time the front door and the rear door are closed, and the loading box is reset.

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

[0022] 1. By arranging a positioning through hole on the welding platform and arranging a sliding support plate in the positioning through hole, after the sliding support plate closes the positioning through hole, a positioning groove that can position the bottom plate is formed above the sliding support plate and on the side wall of the positioning through hole, and the first feeding mechanism feeds the bottom plate into the positioning groove, thus completing the loading and positioning of the bottom plate. During welding, the positioning groove clamps the bottom plate to prevent the bottom plate from shifting; after the welding is completed, the sliding support plate can open the positioning through hole, and the bottom plate falls down to the conveyor under the welding platform for transportation or falls into the receiving box under the welding platform, so as to facilitate the unloading and transfer of the bottom plate after welding, thereby greatly improving the overall efficiency, that is, through one structure, the rapid positioning of the bottom plate and the limitation of the bottom plate during welding are realized, and the rapid unloading and transfer of the bottom plate after welding are realized, which is simple and convenient, and multiple steps are carried out simultaneously with high efficiency.

[0023] 2. By setting a loading box, a front door and a rear door are set at the bottom of the loading box. The loading box is set just above the welding position of the fixed plate. Before welding, multiple fixed plates are placed in the loading box, and the loading box is moved downward. Then the front door and the rear door are opened, and the bottom fixed plate in the loading box falls onto the bottom plate. At this time, the fixed plate is just at the welding position, which avoids repeated measurement and positioning of the fixed plate when it is placed on the bottom plate, reduces the positioning steps of the fixed plate and the special positioning mechanism, improves efficiency, and simplifies the structure;

[0024] Second, this method can realize the storage and continuous loading of the fixed plate, that is, after welding a fixed plate and a bottom plate, when the next fixed plate needs to be loaded, it is only necessary to close and open the front door again to complete the loading of the next fixed plate in the loading box, and the loading is simple, which greatly improves the loading efficiency of the fixed plate and reduces manual assistance; in addition, after the front door is opened, the front door drives the top tightening member to clamp the fixed plate of the second bottom layer to prevent the other fixed plates except the bottom layer from falling down;

[0025] Third, after the front door and the rear door are opened and the bottom fixed plate falls onto the bottom plate, the side wall of the loading box, the front door and the inner wall of the rear door cover the top of the fixed plate. First, the fixed plate is limited and fixed to prevent displacement of the fixed plate during welding. There is no need to set up another fixed plate clamping and fixing mechanism, the structure is greatly simplified, and the loading, positioning, and limit fixing of the fixed plate can be completed simultaneously in one step, thereby improving efficiency. Second, the top of the fixed plate is covered to prevent welding slag from hitting the upper plane of the fixed plate during welding, thereby maintaining the smoothness of the plane on the fixed plate, eliminating the step of processing the welding slag on the upper plane of the fixed plate after welding, thereby greatly improving work efficiency.

[0026] Fourth, after the front door is opened, the front door is also used to position and limit the fixed seat, that is, the second push plate of the second feeding mechanism directly pushes the fixed seat into the limiting groove of the front door, so as to complete the positioning and clamping of the fixed seat, and prevent the fixed seat from sliding when welding the fixed seat, that is, when the front door is opened, the positioning and limiting of the fixed seat are completed at the same time, and there is no need to set up a positioning mechanism and a clamping mechanism for the fixed seat. The structure is simple, and the operation steps are reduced, which greatly improves the work efficiency;

[0027] Fifth, after the welding of the fixing plate and the fixing seat is completed, the front door and the rear door can be pushed backwards, and the front door pushes the fixing plate backwards. If the front door can push the fixing plate, it means that the welding of the fixing plate is not firm, otherwise, it means that the welding firmness of the fixing plate is preliminarily qualified; in addition, after the welding is completed, the front door can be pushed forward. If the front door can push the fixing seat, it means that the welding of the fixing seat is not firm, otherwise, it means that the welding firmness of the fixing seat is preliminarily qualified;

[0028] Sixth, after the welding of the fixed plate and the fixed seat is completed, the sliding support plate opens the positioning through hole, the loading box moves downward and presses down the bottom plate, the bottom plate can be pushed downward to unload, and the bottom plate can be smoothly unloaded from the positioning through hole to prevent the bottom plate from being stuck in the positioning through hole.

[0029] In short, the loading box can complete the storage of the fixed plate, continuous automatic loading, and limiting the fixed plate during welding. It can also simultaneously complete the positioning and limiting of the fixed seat. In addition, after welding is completed, it can also complete the welding firmness detection of the fixed seat and fixed plate, as well as push the bottom plate downward to unload. It has high functional integration, simplified structure, simple operation and high efficiency.

[0030] In addition, the first feeding mechanism can clean the upper surface of the bottom plate while completing feeding on the bottom plate, and the second feeding mechanism can clean the lower surface of the fixed seat while completing feeding on the fixed seat, so as to avoid impurities between the bottom plate and the fixed plate, and between the bottom plate and the fixed seat, and maintain the flatness and cleanliness of the connection between the bottom plate and the fixed seat; simplify the structure of the cleaning mechanism, integrate multiple steps into one, and improve the overall efficiency.

[0031] 3. By providing a first brush surface on the front door and the rear door, the bottom surface of the fixed plate can be cleaned when the front door and the rear door are opened, thereby maintaining the cleanliness between the fixed plate and the bottom plate, avoiding dirt from being caught between the fixed plate and the bottom plate, preventing the fixed plate from being lifted up by dirt, and helping to weld the fixed plate more firmly to the bottom plate.

[0032] 4. By setting the first feeding mechanism as the structure of the first feeding table, a placement groove is provided on the first feeding table, a lifting pallet is provided in the placement groove, and the right side of the first feeding table is connected to the first pushing plate through the first electric push rod, multiple bottom plates can be placed on the lifting pallet, the placement groove forms a storage space for the bottom plates, and the lifting pallet pushes the bottom plates upward so that the top bottom plate leaks out of the table top of the first feeding table, and then the first electric push rod drives the first pushing plate to push the top bottom plate onto the sliding pallet in the positioning through hole to complete the loading of the bottom plates. When loading the bottom plates again, the lifting pallet only needs to push the top bottom plate out of the table top of the feeding table again, and then push the bottom plates, thereby realizing continuous and automatic loading of the bottom plates, reducing manual assistance, and improving overall efficiency.

[0033] 5. By setting the second loading mechanism as a structure of a second loading platform, a second electric push rod and a raising platform, the base is placed in the second push plate, and then the second electric push rod drives the second push plate to push the base into the limiting groove of the front door, thereby completing the positioning and loading of the fixed seat, and loading is simple.

[0034] 6. By setting the tensioning member to a structure of a lower rack, an upper rack and multiple gears, when the front door slides forward to open, the lower rack moves forward, and the lower rack drives the upper rack to move backward through multiple gears, and the upper rack moves backward and extends to support the fixed plate to prevent the fixed plate from sliding down.

[0035] 7. By providing a strip groove on the rear side wall of the loading box, and a non-slip rubber pad in the strip groove, the fixing plate can be pushed on the non-slip rubber pad when the tightening member pushes the fixing plate of the second bottom layer backward. The setting of the non-slip rubber pad can, on the one hand, prevent slipping and prevent the fixing plate from slipping, and on the other hand, the non-slip rubber pad can produce a slight deformation under the squeezing of the fixing plate. The rear side of the fixing plate is wrapped on the non-slip rubber pad to a certain extent, which is convenient for pushing the fixing plate backward and improving the tightening firmness of the fixing plate.

[0036] 8. By setting a sliding rail groove, and the sliding rail groove is parallel to the outside of the welding position of the fixed plate and the fixed seat, a sliding block is set on the sliding rail groove, and a rotating block is rotatably set on the sliding block, and the rotating block is hinged with a first telescopic member, and the welding gun is fixed on the telescopic member. When welding, the welding gun moves along the sliding rail groove, and when the welding gun moves, the welding of the fixed plate and the fixed seat is completed, and the automation is strong. The rotating block can drive the welding gun to rotate, thereby adjusting the angle of the welding position of the welding gun, and the setting of the first telescopic member can adjust the extension length of the welding gun, so that the welding gun is better aligned with the welding line of the fixed plate and the fixed seat.

[0037] 9. By setting the sliding rail groove at the bottom of the material receiving box, the front door, the rear door and the second push plate, the welding gun moves along the sliding rail groove, and the route setting is simple.

[0038] 10. By using a pad welding device to weld the pad, the welding method can simultaneously complete the loading, cleaning and limiting of the base plate in one step, and can also simultaneously complete the positioning, loading and limiting of the fixed plate in one step. In addition, the loading and limiting of the fixed seat can be completed in one step. After the welding is completed, the welding firmness of the fixed plate and the fixed seat can be tested by moving the front door and the rear door. After the test is completed, the sliding pallet is opened and the loading box is pressed down to complete the unloading of the base plate. The connection between each step is highly automated, which reduces manual operation and improves overall efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention will be further described below in conjunction with the accompanying drawings:

[0040] Figure 1 is a schematic diagram of the structure of the pad;

[0041] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0042] Figure 3 for Figure 2 A magnified view at point A;

[0043] Figure 4 It is a structural schematic diagram of the sliding support plate in the welding platform;

[0044] Figure 5 Schematic diagram of the cross-sectional structure of the present invention at the loading box;

[0045] Figure 6 for Figure 5 Enlarged view at B;

[0046] Figure 7 for Figure 5 Enlarged view at C;

[0047] Figure 8 It is a structural schematic diagram of the feeding box and the bottom of the second push plate;

[0048] Fig. 9 for Figure 8 Enlarged view at D;

[0049] Fig.10 It is a schematic diagram of the structure in the sliding block;

[0050] Fig.11 It is a structural schematic diagram of the sliding rail groove;

[0051] Fig.12 It is a cross-sectional view of the present invention at the second loading platform;

[0052] In the figure: 1, welding platform; 2, welding gun; 3, first feeding mechanism; 301, first feeding platform; 302, placement slot; 303, lifting support plate; 304, first hydraulic push rod; 305, first electric push rod; 306, first push plate; 307, cleaning rod; 308, second hydraulic push rod; 4, second feeding mechanism; 401, second push plate; 402, second electric push rod; 403, padding platform; 405, second feeding platform; 5, sliding slot; 6, sliding rail slot; 601, first slide rail slot; 602, second slide rail slot; 603, connecting slide rail slot; 7, top tightening member; 701, lower rack; 702, upper rack; 703, gear; 704, slot; 8, front door; 9, rear door; 10, fixed plate; 11, limit slot; 12, fixed seat; 13, loading box; 14, positioning through hole; 15, sliding support plate; 16, slide bar; 17, bottom plate; 18, driving member; 19, non-slip rubber pad; 20, hanger; 21, third electric push rod; 22, fourth electric push rod; 23, connecting plate; 24, sliding block; 25, rotating block; 26, first telescopic member; 27, first motor; 28, strip groove; 29, notch groove; 30, conveyor. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1-12 The present invention is further described in detail. For a clearer illustration, only the structures related to the inventive point of the present invention are shown in the figure.

[0054] For the convenience of description, the coordinate system is defined as Figure 1 As shown, the left-right direction is the horizontal direction, the front-back direction is the longitudinal direction, and the up-down direction is the vertical direction.

[0055] The embodiment of the present invention discloses a pad welding device. For welding a pad, for example Figure 1 As shown, it mainly includes a bottom plate 17, on which a fixing plate 10 and a fixing seat 12 are welded at a specified position. A backing plate welding device is used for welding a backing plate, referring to Figure 2 and Figure 5 , including a welding platform 1 and a welding gun 2. The welding gun 2 is arranged at the welding platform 1 and is used to weld the fixing plate 10 and the fixing seat 12 to the bottom plate 17. The arrangement of the welding gun 2 will be described in detail below.

[0056] For welding platforms, such as Figure 2 , Figure 4 and Figure 5 As shown, the welding platform 1 is provided with a positioning through hole 14 that matches the size of the bottom plate 17. In order to prevent the bottom plate 17 from shaking in the positioning through hole 14, the size of each side of the positioning through hole 14 is 2-5 mm larger than the size of the corresponding sides of the bottom plate 17. A sliding support plate 15 that can open or close the positioning through hole 14 is provided in the positioning through hole 14. Specifically, a sliding groove 5 is provided on one side of the positioning through hole 14 on the welding platform 1. The sliding support plate 15 can be horizontally slidably arranged in the sliding groove 5, and one side of the sliding support plate 15 is connected to a driving member 18 that drives it to slide. The driving member 18 can be a cylinder or other common mechanism that can drive the sliding support plate 15 to slide.

[0057] By sliding the sliding support plate 15, the positioning through hole 14 can be opened or closed. After the sliding support plate 15 closes the positioning through hole 14, the upper side of the sliding support plate 15 and the side plate of the positioning through hole 14 form a positioning hole groove for the bottom plate 17. Before welding, the bottom plate 17 can be positioned and placed on the sliding support plate 15. After the bottom plate 17 is positioned and placed on the sliding support plate 15, the upper plane of the bottom plate 17 is higher than the upper plane of the welding platform 1, that is, the distance between the upper plane of the sliding support plate 15 and the table surface of the welding platform 1 is less than the thickness of the bottom plate 17, so that the upper plane of the bottom plate 17 can leak out of the upper plane of the welding platform 1. After the welding of the pad is completed, when the pad needs to be unloaded, the sliding support plate 15 can be slid into the sliding groove 5, the sliding support plate 15 opens the positioning through hole 14, and the pad falls from the positioning through hole 14 to the bottom of the welding platform 1, completing the unloading of the pad. A conveyor 30 or a material receiving box may be provided below the positioning through hole 14 of the welding platform 1 to transport or carry the backing plate after welding.

[0058] like Figure 2 , Figure 3 and Figure 5 As shown, a loading box 13 is provided above the welding platform 1, and an inverted L-shaped hanger 20 is provided on the rear side of the welding platform 1. The hanger 20 is connected to the loading box 13 through a plurality of third electric push rods 21 that can be extended and retracted up and down. The extension and retraction of the third electric push rods 21 drive the loading box 13 to move up and down. When set, the outlet of the loading box 13 is directly opposite to the welding position of the fixed plate 10. The loading box 13 is rectangular, and the net dimensions of the inner width and inner length of the loading box 13 correspond to the width and length of the fixed plate 10 one by one, or are slightly larger than the corresponding dimensions of each side of the fixed plate 10. The loading box 13 contains a plurality of fixed plates 10, and the bottom of the loading box 13 is provided with a front door 8 that can slide forward and open, and a rear door 9 that opens backward. Specifically, a notch groove 29 is provided at the bottom of the front wall of the loading box 13 and the bottom of the rear wall of the loading box 13, and the front door 8 and the rear door 9 are connected and arranged in the notch groove 29 of the loading box 13 so as to slide forward and backward. For example, a slide bar 16 can be provided on the left and right sides of the front door 8 and the rear door 9, and a slide bar 16 groove slidably connected to the slide bar 16 is provided on the left and right side walls in the notch groove 29. The bottoms of the front door 8 and the rear door 9 are flush with the bottom of the loading box 13, and there is a gap between the top of the notch groove 29 and the upper planes of the front door 8 and the rear door 9. A connecting plate 23 is fixed to the left and right front ends of the front door 8 and the left and right rear ends of the rear door 9, and each connecting plate 23 is connected to the loading box 13 through a fourth electric push rod 22, and the body of the fourth electric push rod 22 is fixed to the side wall of the loading box 13. When the front door 8 and the rear door 9 are closed, they are used to support the fixed plate 10 in the loading box 13. When the front door 8 and the rear door 9 are opened, the bottom fixed plate 10 falls onto the bottom plate 17 to complete the loading of the bottom plate 17.

[0059] In addition, a first brush surface (not shown in the accompanying drawings) is provided on the upper plane of the front door 8 and the rear door 9. When the front door 8 and the rear door 9 are opened, the first brush surface is used to clean the bottom surface of the fixed plate 10. Then, when the front door 8 and the rear door 9 are opened, the bottom surface of the fixed plate 10 can be cleaned to maintain the cleanliness between the fixed plate 10 and the bottom plate 17, avoid dirt being caught between the fixed plate 10 and the bottom plate 17, prevent the fixed plate 10 from being lifted up by dirt, and help the fixed plate 10 to be more firmly welded to the bottom plate 17.

[0060] In addition, a tensioning member 7 is provided on the front side wall of the loading box 13, and the tensioning member 7 is connected to the front door 8. When the front door 8 slides forward and opens, the front door 8 drives the tensioning member 7 to extend backward to clamp the fixing plate 10 of the second bottom layer in the loading box 13, so as to prevent the fixing plate 10 of the second bottom layer and the fixing plates 10 above the second bottom layer from falling downward after the front door 8 is opened. Figure 5 and Figure 6 As shown, the clamping member 7 includes a lower rack 701, an upper rack 702 and a plurality of gears 703 meshed together in sequence, a slot 704 is provided in the front side wall of the loading box 13, the upper rack 702 is set in the upper part of the slot 704 for sliding back and forth, the teeth of the lower rack 701 face upward, and the lower rack 701 is fixedly set on the upper plane of the front door 8, the gears 703 are an odd number, and a plurality of gears 703 are rotatably set in the slot 704 from top to bottom, the lower rack 701 is meshed with the upper rack 702 through a plurality of gears 703, that is, the lowest gear 703 is meshed with the lower rack 701, and the highest gear 703 is meshed with the upper rack 702. When the front door 8 slides forward and opens, the lower rack 701 moves forward, and the lower rack 701 drives the upper rack 702 to move backward through the plurality of gears 703, and the upper rack 702 moves backward and extends to support the fixing plate 10 to prevent the fixing plate 10 from sliding down. Figure 5 and Figure 7 As shown, a strip groove 28 may be provided on the inner wall of the rear side of the loading box 13, the strip groove 28 corresponds to the position of the fixing plate 10 of the second bottom layer in the loading box 13, and the upper and lower heights of the strip groove 28 are greater than the thickness of the fixing plate 10, and a non-slip rubber pad 19 is provided in the strip groove 28. When the pressing member 7 presses the fixing plate 10 of the second bottom layer backward, the fixing plate 10 may be pressed against the non-slip rubber pad 19. The provision of the non-slip rubber pad 19 can, firstly, prevent slipping and prevent the fixing plate 10 from sliding off, and secondly, the non-slip rubber pad 19 can produce a slight deformation under the extrusion of the fixing plate 10, so that the pressing member 7 presses the fixing plate 10 against the non-slip rubber pad 19 more firmly.

[0061] In addition, if Figure 2 , Figure 3 and Figure 6 As shown, the front side of the front door 8 is provided with a limiting groove 11. After the front door 8 is fully opened, the limiting groove 11 is used to position and limit the base. Therefore, in the specific setting, the length of the front door 8 in the front and rear directions is determined according to the distance between the fixing seat 12 and the fixing plate 10, so that after the front door 8 is fully opened, the limiting groove 11 of the front door 8 is exactly located at the welding position of the fixing seat 12, thereby increasing the functionality of the front door 8. Figure 2 and Fig.12 As shown, a first loading mechanism 3 is provided on the right side of the welding platform 1, and the first loading mechanism 3 is used to load the bottom plate 17 onto the sliding support plate 15 of the welding platform 1, and in the process of loading, the upper surface of the bottom plate 17 is cleaned. Specifically, for the first loading mechanism 3, the first loading mechanism 3 includes a first loading platform 301, a placement groove 302 is provided on the first loading platform 301, a lifting support plate 303 that can be lifted and lowered is provided in the placement groove 302, the bottom of the lifting support plate 303 is connected to the first hydraulic push rod 304, the first hydraulic push rod 304 drives the lifting support plate 303 to rise and fall, and a plurality of bottom plates 17 are placed on the lifting support plate 303 in the placement groove 302. A horizontally retractable first electric push rod 305 is provided on the right side of the first loading platform 301, and a first push plate 306 is fixed on the telescopic rod of the first electric push rod 305. The first electric push rod 305 is extended to push the uppermost bottom plate 17 into the positioning through hole 14 of the welding platform 1; in addition, a cleaning rod 307 is provided on the first loading platform 301 above the placement groove 302 and can be raised and lowered. The cleaning rod 307 is arranged on the first loading platform 301 through two second hydraulic push rods 308. A second brush surface is provided on the bottom surface of the cleaning rod 307, and the second brush surface is used to clean the upper plane of the bottom plate 17. During operation, the placement groove 302 forms a storage space for the bottom plate 17. When loading is required, the lifting support plate 303 lifts the bottom plate 17 upward, so that the top bottom plate 17 leaks out of the table surface of the first loading platform 301, and then the first electric push rod 305 drives the first push plate 306 to push the top bottom plate 17 onto the sliding support plate 15 in the positioning through hole 14, completing the loading of the bottom plate 17. If the bottom plate 17 is to be loaded again, the lifting support plate 303 only needs to push the top bottom plate 17 out of the table surface of the loading platform again, and then use the first electric push rod 305 to push the bottom plate 17, so as to realize continuous and automatic loading of the bottom plate 17, reduce manual assistance, and improve overall efficiency.

[0062] like Figure 2 , Figure 3 and Fig.12As shown, the front side of the welding platform 1 is provided with a second feeding mechanism 4, which includes a second feeding platform 405, a second electric push rod 402 and a second push plate 401. A padding platform 403 is provided on the welding platform 1 at the front side of the positioning through hole 14. The upper plane of the second feeding platform 405, the upper plane of the bottom plate 17 located above the sliding support plate 15, and the upper plane of the padding platform 403 are all in the same plane. The second push plate 401 is connected to the second feeding platform 405 through the second electric push rod 402. A certain distance is set between the bottom of the second push plate 401 and the plane of the feeding platform. It is best that when the feeding box 13 moves down to feed the fixed plate 10, the bottom of the second push plate 401 is flush with the bottom of the feeding box 13. In addition, the cross-sectional shape of the second push plate 401 is U-shaped, which corresponds to the limiting groove 11 of the front door 8. The width of the U-shaped opening of the second push plate 401 is 2-5mm larger than the width of the base. The fixed seat 12 is first placed in the U-shaped opening of the second push plate 401. The second push plate 401 pushes the fixed seat 12 to push the fixed seat 12 into the limiting groove 11 to complete the loading of the fixed seat 12. In addition, after the second push plate 401 pushes the fixed seat 12 into the limiting groove 11, that is, after the fixed seat 12 reaches the welding position, the second push plate 401 contacts the front door 8, and the second push plate 401 and the front door 8 enclose the fixed seat 12 to complete the limiting fixation of the fixed seat 12, facilitate welding, and prevent the fixed seat 12 from sliding. After welding is completed, the second electric push rod 402 drives the second push plate 401 to retract forward. In addition, a third brush surface is provided on the raising platform 403, and the third brush surface is used to clean the lower plane of the fixing plate 10, that is, when the second pushing plate 401 pushes the fixing seat 12, the bottom surface of the fixing seat 12 is cleaned simultaneously.

[0063] In addition, for the welding gun 2, manual welding can be selected, that is, the welding gun 2 can be held to weld the fixing seat 12 and the fixing plate 10, or a welding robot can be set to improve welding efficiency and automation. Figure 8 , Fig. 9 , Fig.10 and Fig.11As shown, in the present invention, for the welding robot, it includes a sliding rail groove 6, which is arranged parallel to the outside of the welding position along the line of the fixed plate 10 and the fixed seat 12, and a sliding block 24 is slidably arranged in the sliding rail groove 6, and the sliding block 24 is provided with a walking motor that can drive it to walk. The walking route of the sliding block 24 can be controlled by the plc code that controls the walking motor, and the plc code of the walking motor adopts the process control program commonly used in the prior art. The sliding block 24 is horizontally rotatably connected with a rotating block 25, and an empty slot is arranged in the sliding block 24. The upper end of the rotating block 25 is connected to the first motor 27 that drives it to rotate, and the first motor 27 is embedded in the empty slot in the sliding block 24. The side of the rotating block 25 away from the sliding rail groove 6 is hinged with a first telescopic member 26 that can rotate up and down through a hinge shaft, and the hinge shaft is connected to a second motor (not shown in the accompanying drawings) that drives it to rotate, and the welding gun 2 is fixed on the telescopic rod of the first telescopic member 26. During welding, the sliding block 24 drives the welding gun 2 to move along the sliding rail groove 6, and in this process, the welding of the fixed plate 10 and the fixed seat 12 is completed, and the degree of automation is high. The rotating block 25 can drive the welding gun 2 to rotate, thereby adjusting the angle of the welding position of the welding gun 2, and the first telescopic member 26 can adjust the extension length of the welding gun 2, so that the welding gun 2 can be better aligned with the welding line of the fixed plate 10 and the fixed seat 12.

[0064] In this embodiment, Figure 8 and Fig.11 As shown, the sliding rail groove 6 is arranged at the bottom of the material receiving box, the front door 8, the rear door 9, and the second push plate 401, including a first sliding rail groove 601, a second sliding rail groove 602 and a connecting sliding rail groove 603. After the front door 8 and the rear door 9 open the material feeding box 13 into place, and after the second push plate 401 pushes the fixed seat 12 into place, the first sliding rail groove 601 is located on the outer side above the line of the welding position of the fixed plate 10, and the second sliding rail groove 602 is located on the outer side above the line of the welding position of the fixed seat 12. The first sliding rail groove 601 is connected with the second sliding rail groove 602 through the connecting sliding rail groove 603, so that the sliding block 24 can be moved from the first sliding rail groove 601 to the second sliding rail groove 602, and can also be moved from the second sliding rail groove 602 to the first sliding rail groove 601, so as to realize the continuous transfer of the sliding block 24 when the fixed plate 10 and the fixed seat 12 are welded. By arranging the sliding rail groove 6 at the bottom of the material receiving box, the front door 8, the rear door 9 and the second push plate 401, the welding gun 2 moves along the sliding rail groove 6, and the route setting is simple.

[0065] In addition, the first brush surface, the second brush surface and the third brush surface mentioned above can be made of short-bristled soft brushes.

[0066] The technical effects of the present invention are mainly as follows: by arranging a positioning through hole 14 on the welding platform 1, arranging a sliding support plate 15 in the positioning through hole 14, after the sliding support plate 15 closes the positioning through hole 14, a positioning groove that can position the bottom plate 17 is formed above the sliding support plate 15 and on the side wall of the positioning through hole 14, and then the first feeding mechanism 3 feeds the bottom plate 17 into the positioning groove, that is, the feeding positioning of the bottom plate 17 is completed, and during welding, the positioning groove clamps the bottom plate 17 to prevent the bottom plate 17 from shifting; and after welding is completed, After completion, the sliding support plate 15 can open the positioning through hole 14, and the bottom plate 17 falls downward onto the conveyor 30 below the welding platform 1 for transportation or falls into the receiving box below the welding platform 1, which is convenient for the unloading and transfer of the bottom plate 17 after welding, greatly improving the overall efficiency. That is, through one structure, the bottom plate 17 can be quickly positioned and the bottom plate 17 can be limited during welding, and the bottom plate 17 can be quickly unloaded and transferred after welding. It is simple and convenient, and multiple steps are carried out simultaneously with high efficiency.

[0067] By setting a loading box 13, a front door 8 and a rear door 9 are set at the bottom of the loading box 13, and the loading box 13 is set just above the welding position of the fixed plate 10. Before welding, multiple fixed plates 10 are placed in the loading box 13, and the loading box 13 is moved downward. Then the front door 8 and the rear door 9 are opened, and the bottom fixed plate 10 in the loading box 13 falls onto the bottom plate 17, and the fixed plate 10 is just at the welding position at this time, which avoids repeated measurement and positioning of the fixed plate 10 when it is placed on the bottom plate 17, reduces the positioning steps of the fixed plate 10 and the special positioning mechanism, improves efficiency, and simplifies the structure;

[0068] Second, this method can realize the storage and continuous loading of the fixed plate 10, that is, after welding a fixed plate 10 and the bottom plate 17, when the next fixed plate 10 needs to be loaded, it is only necessary to close and open the front door 8 again to complete the loading of the next fixed plate 10 in the loading box 13, and the loading is simple, which greatly improves the loading efficiency of the fixed plate 10 and reduces human assistance; in addition, after the front door 8 is opened, the front door 8 drives the top tightening member 7 to clamp the fixed plate 10 of the second bottom layer to prevent the other fixed plates 10 except the bottom layer from falling down;

[0069] Third, after the front door 8 and the rear door 9 are opened and the bottom fixed plate 10 falls onto the bottom plate 17, the side walls of the loading box 13, the front door 8 and the inner walls of the rear door 9 cover the top of the fixed plate 10, firstly, the fixed plate 10 is limited and fixed, and the fixed plate 10 is prevented from shifting during welding. There is no need to set up another clamping and fixing mechanism for the fixed plate 10, the structure is greatly simplified, and the loading, positioning, and limit fixing of the fixed plate 10 can be completed simultaneously in one step, thereby improving efficiency; secondly, the top of the fixed plate 10 is covered, and during welding, welding slag is prevented from hitting the upper plane of the fixed plate 10, and the smoothness of the upper plane of the fixed plate 10 is maintained, which eliminates the step of processing the welding slag on the upper plane of the fixed plate 10 after welding is completed, thereby greatly improving work efficiency;

[0070] Fourth, after the front door 8 is opened, the front door 8 is also used to position and limit the fixing seat 12, that is, the second pushing plate 401 of the second feeding mechanism 4 directly pushes the fixing seat 12 into the limiting groove 11 of the front door 8, so as to complete the positioning and clamping of the fixing seat 12, and prevent the fixing seat 12 from sliding when welding the fixing seat 12, that is, when the front door 8 is opened, the positioning and limiting of the fixing seat 12 are completed at the same time, and there is no need to set up a positioning mechanism and a clamping mechanism for the fixing seat 12, the structure is simple, and the operation steps are reduced, which greatly improves the work efficiency;

[0071] Fifth, after the welding of the fixing plate 10 and the fixing seat 12 is completed, the front door 8 and the rear door 9 can be pushed backwards, and the front door 8 pushes the fixing plate 10 backwards. If the front door 8 can push the fixing plate 10, it means that the welding of the fixing plate 10 is not firm, otherwise, it means that the welding firmness of the fixing plate 10 is preliminarily qualified; in addition, after the welding is completed, the front door 8 can be pushed forward. If the front door 8 can push the fixing seat 12, it means that the welding of the fixing seat 12 is not firm, otherwise, it means that the welding firmness of the fixing seat 12 is preliminarily qualified;

[0072] Sixth, after the welding of the fixed plate 10 and the fixed seat 12 is completed, the sliding support plate 15 opens the positioning through hole 14, and the loading box 13 moves downward and presses down the bottom plate 17, so that the bottom plate 17 can be pushed downward to unload, and the bottom plate 17 can be smoothly unloaded from the positioning through hole 14 to prevent the bottom plate 17 from being stuck in the positioning through hole 14.

[0073] In short, the loading box 13 can complete the storage of the fixed plate 10, continuous automatic loading, and limiting fixation of the fixed plate 10 during welding, and can also simultaneously complete the positioning and limiting of the fixed seat 12; in addition, after welding is completed, it can also complete the welding firmness detection of the fixed seat 12 and the fixed plate 10, and push the bottom plate 17 downward to unload, with high functional integration, simplified structure, simple operation and high efficiency.

[0074] In addition, the first feeding mechanism 3 can clean the upper surface of the bottom plate 17 while completing the feeding of the bottom plate 17, and the second feeding mechanism 4 can clean the lower surface of the fixed seat 12 while completing the feeding of the fixed seat 12, so as to avoid impurities between the bottom plate 17 and the fixed plate 10, and between the bottom plate 17 and the fixed seat 12, and maintain the flatness and cleanliness of the docking between the bottom plate 17 and the fixed seat 12; simplify the structure of the cleaning mechanism, integrate multiple steps into one, and improve the overall efficiency.

[0075] A welding method for welding a backing plate using a backing plate welding device comprises the following steps:

[0076] (1) Preparation: The loading box 13 moves upward, the sliding support plate 15 closes the positioning through hole 14, the front door 8 and the rear door 9 close the bottom of the loading box 13, and multiple fixing plates 10 are installed in the loading box 13. The bottom plate 17 is placed on the first loading platform 301, and the fixing seat 12 is placed in the second pushing plate 401 on the second loading platform 405;

[0077] (2) Positioning, loading and limiting: The first loading mechanism 3 loads the bottom plate 17 onto the sliding support plate 15 of the positioning through hole 14, completing the positioning, loading and limiting of the bottom plate 17, and in the process of loading the bottom plate 17, completing the cleaning of the upper surface of the bottom plate 17; the loading box 13 moves downward and approaches the bottom plate 17 until the distance between the bottom of the loading box 13 and the bottom plate 17 is less than the thickness of the fixed plate 10 and greater than three quarters of the thickness of the fixed plate 10, the front door 8 and the rear door 9 are opened to both sides, and the bottom fixed plate 10 in the loading box 13 falls on the bottom plate 17, completing the positioning, loading and limiting of the fixed plate 10; the second loading mechanism 4 pushes the fixed seat 12 onto the bottom plate 17, and clamps the fixed seat 12 into the limiting groove 11 of the front door 8, completing the positioning, loading and limiting of the fixed seat 12, and in the process of pushing the fixed seat 12, completing the cleaning of the lower surface of the fixed seat 12;

[0078] (3) Welding: The welding gun 2 welds the fixing plate 10 and the fixing seat 12 along the outer sides of the fixing plate 10 and the fixing seat 12;

[0079] (4) Preliminary test of welding firmness: Push the front door 8 and the rear door 9 backwards. If the front door 8 can push the fixing plate 10, it means that the welding of the fixing plate 10 is not firm. Otherwise, it means that the welding firmness of the fixing plate 10 is preliminarily qualified. The second push plate 401 retracts forward first, and then pushes the front door 8 forward. If the front door 8 can push the fixing seat 12, it means that the welding of the fixing seat 12 is not firm. Otherwise, it means that the welding firmness of the fixing seat 12 is preliminarily qualified.

[0080] (5) Unloading: The sliding support plate 15 opens the positioning hole 14, and the loading box 13 moves downward. The loading box 13 pushes the bottom plate 17 to fall from the positioning hole 14 of the welding platform 1, completing the unloading of the bottom plate 17; then the loading box 13 moves upward, and at the same time, the front door 8 and the rear door 9 are closed, and the loading box 13 completes the reset.

[0081] As mentioned above, during the preliminary inspection of welding firmness, the front door 8 and the rear door 9 can be pushed by the fourth electric push rod 22, that is, a force of extending or retracting is applied to the fourth electric push rod 22 to see whether it can drive the front door 8 and the rear door 9 to move.

[0082] By using a pad welding device to weld the pad, the welding method can simultaneously complete the loading, cleaning and limiting of the bottom plate 17 in one step, and can also simultaneously complete the positioning, loading and limiting of the fixed plate 10 in one step. In addition, the loading and limiting of the fixed seat 12 can also be completed in one step. After the welding is completed, the welding firmness of the fixed plate 10 and the fixed seat 12 can be tested by moving the front door 8 and the rear door 9. After the test is completed, the sliding support plate 15 is opened and the loading box 13 is pressed down to complete the unloading of the bottom plate 17. The connection between each step is highly automated, which reduces manual operation and improves overall efficiency.

[0083] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. It should be understood that the specific embodiments described herein are only used to understand the present invention and are not used to limit the present invention. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A backing plate welding device, comprising a welding platform and a welding gun, wherein the welding gun is arranged at the welding platform and is used to weld a fixing plate and a fixing seat to a bottom plate, characterized in that: The welding platform is provided with a positioning through hole matching the size of the bottom plate, and the positioning through hole is provided with a sliding support plate that can be opened or closed. After the bottom plate is positioned and placed on the sliding support plate, the upper plane of the bottom plate is higher than the upper plane of the welding platform, and a loading box is provided above the welding platform that can be lifted and lowered, and the outlet of the loading box is directly opposite to the welding position of the fixed plate, and a plurality of fixing plates are installed in the loading box. The bottom of the loading box is provided with a front door that can slide forward and open and a rear door that can be opened backward. When the front door and the rear door are closed, the fixing plate in the loading box is supported. When the front door and the rear door are opened, the bottom fixing plate falls on the bottom plate, and a limiting groove is provided on the front side of the front door. After the front door is opened in place, the limiting groove is used to position and limit the fixing seat; a tightening piece is provided on the front side wall in the loading box, and the tightening piece is connected with the front door. When the front door slides forward and opens, the front door drives the tightening piece to clamp the fixing plate of the second bottom layer in the loading box; A first loading mechanism is provided on the right side of the welding platform, and the first loading mechanism is used to load the bottom plate onto the sliding support plate of the welding platform, and in the process of loading, the upper surface of the bottom plate is cleaned; a second loading mechanism is provided on the front side of the welding platform, and the second loading mechanism includes a second push plate, and the cross-sectional shape of the second push plate is U-shaped, and the second push plate is used to push the fixed seat into the limiting groove, and in the process of pushing the fixed seat, the bottom surface of the fixed seat is cleaned, and after the fixed seat is in place, the second push plate contacts the front door; The clamping member includes a lower rack, an upper rack and a plurality of gears meshingly connected in sequence. A slot is provided in the front side wall of the loading box. The upper rack is slidably arranged above the slot, and the lower rack is fixedly arranged on the upper plane of the front door. The gears are an odd number, and a plurality of gears are rotatably arranged in the slot from top to bottom. The lower rack is meshingly connected to the upper rack through a plurality of gears.

2. A backing plate welding device according to claim 1, characterized in that: A first brush surface is provided on the upper plane of the front door and the rear door. When the front door and the rear door are opened, the first brush surface is used to clean the bottom surface of the fixed plate.

3. A backing plate welding device according to claim 1, characterized in that: The first loading mechanism includes a first loading platform, a placement slot is provided on the first loading platform, a lifting support plate that can be raised and lowered is provided in the placement slot, a plurality of bottom plates are placed on the lifting support plate in the placement slot, a first electric push rod that can be horizontally extended and retracted is provided on the right side of the first loading platform, a first pushing plate is provided on the telescopic rod of the first electric push rod, and the first electric push rod is used to push the bottom plate into the positioning through hole of the welding platform; a cleaning rod that can be raised and lowered is provided on the first loading platform above the placement slot, a second brush surface is provided on the bottom surface of the cleaning rod, and the second brush surface is used to clean the upper plane of the bottom plate.

4. A backing plate welding device according to claim 1, characterized in that: The second feeding mechanism also includes a second feeding table and a second electric push rod. A raising platform is provided on the welding platform on the front side of the positioning through hole. The upper plane of the second feeding table, the upper plane of the bottom plate above the sliding support plate, and the upper plane of the raising platform are all in the same plane. The second push plate is connected to the second feeding table through the second electric push rod. The raising platform is provided with a third brush surface, and the third brush surface is used to clean the lower plane of the fixed plate.

5. A backing plate welding device according to claim 1, characterized in that: A notch is provided at the bottom of the front wall of the loading box and the bottom of the rear wall of the loading box, and the front door and the rear door are connected in the notch of the loading box so as to slide back and forth. The bottom of the front door and the rear door are flush with the bottom of the loading box, and a connecting plate is fixed at the front end on the left and right sides of the front door and the rear end on the left and right sides of the rear door, and each connecting plate is connected to the loading box through a fourth electric push rod.

6. A backing plate welding device according to claim 1, characterized in that: A strip groove is provided on the inner wall of the rear side of the loading box, the strip groove corresponds to the position of the fixing plate of the second bottom layer in the loading box, and the upper and lower heights of the strip groove are greater than the thickness of the fixing plate, and an anti-slip rubber pad is provided in the strip groove.

7. A backing plate welding device according to claim 1, characterized in that: The invention also includes a sliding rail groove, which is arranged parallel to the outer side of the welding position of the fixed plate and the fixed seat. A sliding block is slidably arranged in the sliding rail groove. A rotating block is horizontally rotatably connected to the sliding block. The side of the rotating block away from the sliding rail groove is hinged with a first telescopic member through a hinge shaft so as to be able to rotate up and down. The hinge shaft is connected to a motor that drives the rotation thereof. The welding gun is fixed on the telescopic rod of the first telescopic member.

8. A backing plate welding device according to claim 7, characterized in that: The sliding rail groove is arranged at the bottom of the material receiving box, the front door, the rear door and the second push plate, and includes a first sliding rail groove, a second sliding rail groove and a connecting sliding rail groove. After the front door and the rear door open the material feeding box into place, and after the second push plate pushes the fixed seat into place, the first sliding rail groove is located on the outside above the line of the welding position of the fixed plate, and the second sliding rail groove is located on the outside above the line of the welding position of the fixed seat. The first sliding rail groove is connected to the second sliding rail groove through the connecting sliding rail groove.

9. A welding method for welding a backing plate using the backing plate welding device as claimed in claim 1, characterized in that: The steps include: (1) Preparation: The loading box moves upward, the sliding support plate closes the positioning through hole, the front door and the rear door close the bottom of the loading box, and multiple fixing plates are installed in the loading box. The bottom plate is placed on the first loading platform, and the fixing seat is placed in the second pushing plate on the second loading platform; (2) Positioning, loading and limiting: The first loading mechanism loads the bottom plate onto the sliding support plate of the positioning through hole to complete the positioning, loading and limiting of the bottom plate, and in the process of loading the bottom plate, the upper surface of the bottom plate is cleaned; the loading box moves downward and approaches the bottom plate until the distance between the bottom of the loading box and the bottom plate is less than the thickness of the fixed plate and greater than three-quarters of the thickness of the fixed plate, the front door and the rear door are opened to both sides, and the bottom fixed plate in the loading box falls on the bottom plate, completing the positioning, loading and limiting of the fixed plate; the second loading mechanism pushes the fixed seat onto the bottom plate and clamps the fixed seat into the limiting groove of the front door to complete the positioning, loading and limiting of the fixed seat, and in the process of pushing the fixed seat, the lower surface of the fixed seat is cleaned; (3) Welding: The welding gun welds the fixing plate and the fixing seat along the outer sides of the fixing plate and the fixing seat; (4) Preliminary test of welding firmness: Push the front door and the rear door backwards. If the front door can push the fixed plate, it means that the welding of the fixed plate is not firm. Otherwise, it means that the welding firmness of the fixed plate is preliminarily qualified. The second push plate retracts forward first, and then pushes the front door forward. If the front door can push the fixed seat, it means that the welding of the fixed seat is not firm. Otherwise, it means that the welding firmness of the fixed seat is preliminarily qualified. (5) Unloading: The sliding support plate opens the positioning hole, the loading box moves downward, and the loading box pushes the bottom plate to fall from the positioning hole of the welding platform to complete the unloading of the bottom plate; then the loading box moves upward, and at the same time the front door and the rear door are closed, and the loading box is reset.

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